Technology
Mineral Sizers: MMD sizer technology
Published
5 years agoon
By
admin
MMD (Mining Machinery Developments), the inventor and patent holder of the twin shaft mineral sizer, is playing an ever-increasing role in the world’s cement industry.
The MMD mineral sizer was originally designed in 1978 to meet the requirements of the British underground coal mining industry. Having successfully achieved this in the demanding underground coal mining environment, it became evident that the unique attributes and advantages of the MMD twin shaft mineral sizer could be applied to other underground and surface applications and industries. Today, MMD can process over 65 different minerals worldwide, in many varied process industries.
The first unit in to the cement industry was delivered to Cauldon cement works in the UK, (then part of Blue Circle Cement, now Lafarge), in the early 1980s. In contrast to the smaller 500mm centres machines supplied to the underground coal mines, this was a larger unit with 1000mm shaft centres, designed to handle large pieces of shale. This 1000 Series sizer rapidly proved its capabilities as a primary crusher and after providing years of valuable service at the cement plant has been sold to an opencast mine in the Philippines, where it is still working today. This machine was soon followed by another, this time to size sticky clay containing hard material within it. Despite there being specialist clay machines on the market, the issue of sizing this mix of materials was a universal problem, and again the MMD machine proved to be an instant success, and very quickly the industry came to appreciate the unique capabilities of the MMD twin shaft mineral sizer. The MMD 750 Series twin shaft sizer has also been successfully employed in a secondary role at the Cauldon Cement Works for many years and has recently undergone an upgrade to bring its capacity to 1200tph.
Although the major portion of MMD’s interface with the cement industry is still in hard rock quarries and clay, it is by no means confined to these areas, MMD having gone on to increase their product range to include equipment such as their heavy- duty plate feeder, and adapt existing products to meet the requirements of the cement industry.
Against many odds
In the current economic climate of rapidly rising fuel costs and with environmental pressures being felt across all industries around the world, the importance of the cement industry taking a new look at the significant progress being made regarding these issues in the allied mining industry, cannot be underrated.
Although the volume of the raw materials required by the cement industry is low compared with mining, it is a highly visible and therefore potentially contentious element in the production chain, as cement plants tend to be developed close to the markets, and hence in more sensitive areas. A situation which makes the growing use of In-Pit Crushing and Conveying (IPCC) rather than truck haulage, an area of particular significance. Not only does IPCC allow for a reduction in the dependence on expensive oil based fuel, it is seen as being eco-friendly due to the potential reduction (or elimination) of green-house gasses in exhaust fumes as well as the noise and dust generated by trucks.
Mobile crushers and IPCC are not new concepts and their benefits are well established within quarrying. However, the vast majority of these quarries produce at a lower rate than is generally required by cement plants. But this scenario is changing, due to both the unprecedented boom in the commodities market and rapid urbanisation. New IPCC installations in mining and articles and conferences dedicated to this technology, have resulted in a proliferation of the number of companies which are developing or attempting to develop high capacity equipment for the burgeoning IPCC market. This is a field where MMD, who have championed the use of mobile sizing equipment in both the mining and cement industries, can justifiably lay claim to being world leaders, having consistently been involved in this market for over 25 years. During this time, they have installed a host of semi-mobile units, as well as a significant number of low (under 1000tph), medium (2-3000tph), and high capacity (over 5000tph) fully mobile sizers around the world. The unique know-how and experience gained has allowed them to be able to offer the best possible unit, with all the inherent benefits of mobility to the cement industry. However, for the cement industry especially, it is not enough for a potential supplier to be capable of providing high capacity units. The demands for flexibility, consistency in product size and chemistry are onerous. The real need being for equipment which is capable of handling a range of material having very different physical characteristics, as the requirement for a chemically consistent product usually involves blending the core limestone with different often sticky materials.
Breaking and mixing
A prime example of this is the use of the sizer to not only break, but mix the material too; the MMD twin shaft sizer’s contra-rotating shafts and scroll action are ideal for blending the different materials, even those with very different constituencies and moisture content. An increasing number of cement plants are using the MMD sizer in this breaking-cum-blending role. A cross- belt analyser is linked to the variable speed drive of the apron plate feeders, feeding limestone, clay and additives into the sizer, thus ensuring a consistent mix of material to the stockpile and eliminating the need for separate stockpiles and the problems associated with the stockpiling of sticky clay material.
MMD’s existing record within the cement industry and the established features and benefits of the mineral sizer, will hopefully lead to an increased use of this now well established technology. The MMD twin shaft mineral sizer is not limited to a high capacity primary sizing role, there have been numerous examples of cases where the installation of an MMD sizer has either replaced or supplemented the existing equipment when problems have been encountered. For example, in Belgium an MMD sizer was installed in a plant that had been running for many years, where the ever- increasing stickiness was causing problems for the existing roll crusher. The compact size and low profile allowed MMD to install the sizer over an existing conveyor line, involving minimal expense and complication.
Similarly, this new cement plant designed and installed by one the world`s leading cement manufacturers suffered severe production hold-ups due to the amount of clay in the system. The problem was put to MMD, who quickly resolved the situation with a simple installation of a 500 Series sizer within the existing plan, successfully allowing the plant to run at full production.
Some of the most recent orders won by MMD to supply equipment to the cement industry include: A 500 Series twin shaft sizer to process 200tph of clay, from an in-feed size of 350mm to a product size of 80mm, for an Ital Cement plant in Italy. For Volsk Cement in Russia, an apron plate feeder and two 500 Series Twin shaft sizers to reduce gypsum slag (additives) from 350mm in-feed down to 75mm at a rate of 150tph. Plus, for the same plant; a 350 Series machine to reduce gypsum from a feed size of 75mm to a 25mm product at 22tph.
Having supplied their technology worldwide to a variety of cement producers such as Holcim, Cemex, Lafarge, Heidelberg, Italcementi, CRH, Buzzi and Titan Cement as well as to leading cement plant designers such as FLS and Polysius, MMD can justifiably lay claim to a position amongst the leading suppliers to the cement industry.
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Concrete
Reimagining Logistics: Spatial AI and Digital Twins
Published
23 hours agoon
April 13, 2026By
admin
Digital twins and spatial AI are transforming cement logistics by enabling real-time visibility, predictive decision-making, and smarter multi-modal operations across the supply chain. Dijam Panigrahi highlights how immersive AR/VR training is bridging workforce skill gaps, helping companies build faster, more efficient, and future-ready logistics systems.
As India accelerates infrastructure investment under flagship programs such as PM GatiShakti and the National Infrastructure Pipeline, the pressure on cement manufacturers to deliver reliably, efficiently, and cost-effectively has never been greater. Yet for all the modernisation that has taken place on the production side, the end-to-end logistics chain, from clinker dispatch to the last-mile delivery of bagged cement to construction sites, remains a domain riddled with inefficiencies, opacity and manual decision-making.
The good news is that a new generation of spatial computing technologies is now mature enough to transform this reality. Digital twins, spatial artificial intelligence (AI) and immersive augmented and virtual reality (AR/VR) training platforms are converging to offer cement producers something they have long sought: real-time visibility, autonomous decision-making at the operational edge, and a scalable solution to the persistent skills gap that hampers workforce performance.
Advancing logistics with digital twins
The cement supply chain is uniquely complex. A single integrated plant may manage limestone quarrying, kiln operations, grinding, packing and despatch simultaneously, with finished product flowing through rail, road, and waterway networks to reach hundreds of regional depots and distribution points. Coordinating this network using spreadsheets, siloed ERP data, and phone calls is not merely inefficient; it is a structural liability in a competitive market where delivery reliability is a key differentiator.
Digital twin technology offers a way out. A cement logistics digital twin is a continuously updated, three-dimensional virtual replica of the entire supply chain, from the truck loading bays at the plant to the inventory levels at district depots. By ingesting data from IoT sensors on conveyor belts and packing machines, GPS trackers on road and rail fleets, weighbridge records, and weather feeds, the digital twin provides planners with a single, authoritative picture of where every ton of cement is, in real time.
The value, however, goes well beyond visibility. Because the digital twin mirrors the physical system in dynamic detail, it can run scenario simulations before decisions are executed. If a primary rail corridor is disrupted, logistics managers can model alternative routing options, shifting volumes to road or coastal shipping, and assess the cost and time implications within minutes rather than days. If a packing line at the plant is running below capacity, the twin can automatically recalculate dispatch schedules downstream and alert depot managers to adjust receiving resources accordingly.
For cement companies operating multi-plant networks across geographies as varied as Rajasthan and the North-East, this kind of end-to-end situational awareness is transformative. It collapses information latency from hours to seconds, enables proactive rather than reactive logistics management, and creates the data foundation upon which AI-driven decision-making can be built. Companies that have deployed logistics digital twins in comparable heavy-industry contexts have reported reductions in transit time variability of up to 20 per cent and meaningful decreases in demurrage and detention costs, savings that flow directly to the bottom line.
Smart logistics operations
A digital twin is only as powerful as the intelligence layer that sits on top of it. This is where Spatial AI becomes the critical differentiator for cement logistics.
Traditional logistics management systems are reactive. They record what has happened and flag exceptions after the fact. Spatial AI systems, by contrast, are proactive. They continuously analyse the state of the logistics network as represented in the digital twin, identify emerging bottlenecks before they crystallise into delays, and recommend corrective actions.
At the plant gate, AI-powered visual inspection systems using spatial depth-sensing cameras can assess truck conditions, verify load integrity and confirm seal tamper status in seconds, replacing the manual checks that currently slow throughput. At the depot level, Spatial AI can monitor stock drawdown rates in real time, cross-reference them against pending customer orders and inbound shipment ETAs, and automatically trigger replenishment orders when safety thresholds are approached. In transit, AI systems processing GPS and telematics data can detect anomalous vehicle behaviour, including extended stops, route deviations, speed irregularities and alert fleet managers instantly.
Perhaps most significantly for Indian cement logistics, Spatial AI can optimise the complex multi-modal routing decisions that are central to competitive cost management. Given the variability in road quality, seasonal accessibility, rail rake availability, and regional demand patterns across India’s vast geography, the combinatorial complexity of routing optimisation is beyond human planners working with conventional tools. AI systems can process this complexity continuously and adapt routing recommendations as conditions change, reducing empty running, improving vehicle utilisation and cutting fuel costs.
The agentic dimension of modern AI is particularly relevant here. Agentic AI systems do not merely analyse and recommend; they act. In a cement logistics context, this means an AI system that can, within pre-authorised boundaries, directly communicate revised dispatch instructions to plant teams, update booking confirmations with freight forwarders and reallocate available rail rakes across plant locations, all without waiting for a human to process a recommendation and make a call. For logistics executives, this represents a genuine shift from managing a workforce to setting the rules of engagement and reviewing outcomes. The operational tempo achievable with agentic AI simply cannot be matched by human-in-the-loop systems working at the pace of emails and phone calls.
Bridging the skills gap
Technology investments in digital twins and spatial AI will deliver diminishing returns if the human workforce cannot operate effectively within the new systems they create. This is a challenge that India’s cement industry cannot afford to underestimate. The sector relies on a large, geographically dispersed workforce, including truck drivers, depot managers, despatch supervisors, fleet maintenance technicians, many of whom have been trained on paper-based processes and manual workflows. Retraining this workforce for a digitised, AI-augmented environment is a substantial undertaking, and conventional classroom or on-the-job training methods are poorly suited to the scale and pace required.
Immersive AR and VR training platforms offer a fundamentally different approach. By creating photorealistic, interactive simulations of logistics environments, such as a plant dispatch bay, a depot yard, the interior of a cement truck cab, allow workers to practice complex procedures and decision-making scenarios in a safe, consequence-free virtual environment. A depot manager can work through a simulated rail rake delay scenario, making decisions about customer allocation and communication
without the pressure of real orders being affected. A truck driver can practice the correct procedure for securing a load of bagged cement without the risk of a road incident.
The learning science case for immersive training is compelling. Studies consistently show that experiential, simulation-based learning produces faster skill acquisition and higher retention rates than didactic instruction, with some research indicating retention rates three to four times higher for VR-based training compared to classroom methods. For complex operational procedures where muscle memory and situational awareness matter as much as conceptual knowledge, the advantage of immersive simulation is even more pronounced.
Today’s leading cloud-based spatial computing platforms enable high-fidelity AR and VR training experiences to be delivered on standard mobile devices, removing the hardware barrier that has historically made immersive training impractical for large, distributed workforces. This is particularly relevant for cement companies with depots and logistics operations in tier-two and tier-three locations, where access to specialised training hardware cannot be assumed.
The integration of AR into live operations also creates ongoing learning opportunities beyond formal training programs. As an example, maintenance technicians equipped with AR overlays can receive step-by-step guidance for equipment procedures directly in their field of view, reducing error rates and service times for critical plant and fleet assets.
New strategy, new horizons
India’s cement industry is entering a period of intensifying competition, rising logistics costs, and demanding customers with shrinking tolerance for delivery variability. The companies that will lead over the next decade will be those that treat logistics not as a cost centre to be minimised, but as a strategic capability to be built.
Digital twins, spatial AI and immersive AR/VR training are not distant future technologies, they are deployable today on infrastructure that Indian cement companies already operate. The question is not whether to adopt them, but how quickly to do so and where to begin.
About the author:
Dijam Panigrahi is Co-Founder and COO of GridRaster Inc., a provider of cloud-based spatial computing platforms that power high-quality digital twin and immersive AR/VR experiences on mobile devices for enterprises. GridRaster’s technology is deployed across manufacturing, logistics and infrastructure sectors globally.
Concrete
Beyond Despatch: Building a Strategic Supply Chain Process
Published
23 hours agoon
April 13, 2026By
admin
Dr SB Hegde, Global Cement Industry Leader discusses the imperative need for modern cement plants to recognise packaging and bag traceability as critical components of quality assurance and supply chain management.
In cement manufacturing, considerable attention is given to clinker quality, kiln operation, grinding efficiency and laboratory control. Yet the final stage of the process, cement packaging and despatch, often receives less strategic focus. The cement bag leaving the plant gate represents the final interface between the manufacturer and the customer. Even if clinker chemistry, fineness and strength development are well controlled, weaknesses in packaging, handling, or distribution can affect product quality before it reaches the construction site.
Operational experience from cement plants across different regions shows that packaging efficiency and bag traceability have a significant influence on product reliability, logistics performance and brand credibility. In modern cement plants, packaging systems are no longer viewed merely as despatch equipment. They are increasingly recognised as an important part of quality assurance, supply chain management and customer confidence.
Operational importance of packaging
Cement packaging systems must operate with high speed, accuracy and reliability to support efficient despatch operations. Rotary packers equipped with electronic weighing systems have improved packing accuracy and productivity in many plants.
However, maintaining operational discipline remains essential. Regular calibration of weighing systems, maintenance of packer spouts and proper bag application are important for maintaining consistent bag weights and preventing cement loss.
Operational benchmarks observed in many cement plants are summarised in Table 1.
Plants that improved calibration discipline and equipment maintenance have reported packing loss reductions of about 1 per cent to 1.5 per cent, which represents significant annual savings.
Quality assurance beyond the plant gate
Quality control in cement plants traditionally focuses on laboratory parameters such as fineness, compressive strength and chemical composition. However, the condition of cement when it reaches the customer is equally important.
Cement bags may travel through several stages including plant storage, transport vehicles, dealer warehouses and retail outlets before reaching the construction site. During this journey, cement may be exposed to humidity, rough handling and improper storage conditions.
Table 2 shows common factors that may affect cement quality during distribution.
Studies indicate that cement stored under humid conditions for long periods may experience 10 per cent to 20 per cent reduction in early strength. Therefore, maintaining proper packaging integrity and traceability is essential.
Role of cement bag traceability systems
Traceability systems allow manufacturers to identify when and where cement was produced and despatched. These systems connect packaging operations with production records and logistics data.
When customer complaints occur, traceability enables manufacturers to identify:
- Production batch
- Packing date and time
- Plant location
- Laboratory test results
Several technologies are used to implement bag traceability, as shown in Table 3.
Among these technologies, QR code authentication systems are becoming popular because customers can verify product authenticity through smartphones.
Digital transformation
Digital technologies are transforming cement packaging operations. Modern packing lines now integrate:
- automated rotary packers
- electronic bag counting systems
- robotic palletising systems
- ERP-based despatch management
- digital supply chain monitoring
These technologies improve operational efficiency and transparency across the supply chain.
Such systems help manufacturers track cement movement across the distribution network and respond quickly to quality concerns.
Case Study: Digital Cement Bag Authentication
Several cement manufacturers in Asia and the Middle East have implemented QR code-based bag authentication systems to improve supply chain transparency.
In one integrated cement plant, QR codes were integrated into the rotary packing machine. Each cement bag received a unique digital identity linked to the production database.
The QR code contained information such as:
• plant location
• manufacturing date and time
• product type
• batch number
Customers and dealers could scan the code using a mobile application to verify product authenticity.
After implementation, the company reported:
• reduction in counterfeit bag circulation
• improved despatch data accuracy
• faster resolution of customer complaints
• better visibility of distribution networks
The system was also integrated with the company’s ERP platform, enabling real-time monitoring of production and despatch activities.
Future-Smart Packaging Systems
The future of cement packaging lies in the integration of Industry 4.0 technologies with logistics and supply chain management.
Packaging lines will increasingly become part of connected digital ecosystems linking production, quality control, despatch and market distribution.
Artificial intelligence and data analytics may also help detect abnormalities in bag weight variations, equipment performance and despatch patterns.
Global benchmark indicators
Global benchmarking of cement packaging operations highlights the increasing importance of efficiency, automation and digital traceability in modern cement supply chains. Leading cement plants are now focusing on key performance indicators such as packer availability, bag weight accuracy, packing losses, truck turnaround time and digital traceability coverage. Studies show that overall equipment effectiveness (OEE) in many industrial operations is still around 65 per cent to 70 per cent, whereas world-class plants aim for levels above 85 per cent, indicating significant scope for improvement in operational efficiency.
At the same time, the global cement packaging sector is expanding steadily, supported by growing infrastructure demand and increased emphasis on reliable and moisture-resistant packaging solutions. The cement packaging market is projected to grow steadily in the coming decade as companies adopt automation, smart packaging technologies and integrated logistics systems to improve despatch efficiency and supply chain transparency. In this context, benchmarking against global indicators helps cement plants identify performance gaps and adopt best practices such as automated bagging systems, QR-based traceability, ERP-linked despatch monitoring, and predictive maintenance of packing equipment.
Strategic Recommendations
To fully benefit from packaging and traceability systems, cement manufacturers should consider the following approaches.
• Packaging systems should be treated as an integral part of the manufacturing value chain rather than simply despatching equipment.
• Investments in modern packers, automated loading systems and digital traceability technologies should be encouraged.
• Industry associations may also promote standard traceability practices to reduce counterfeit products and improve transparency in the cement market.
Finally, continuous training of plant personnel in packaging operations and maintenance practices is essential for sustaining operational efficiency.
Conclusion
Cement packaging has evolved from a routine mechanical operation into a strategic component of modern cement manufacturing. Efficient packaging systems ensure that the quality achieved within the plant is preserved during transportation and distribution. Traceability technologies allow manufacturers to track cement movement, investigate complaints and prevent counterfeit products.
As the cement industry moves toward digitalisation and integrated supply chains, packaging and bag traceability will play an increasingly important role in quality assurance, operational efficiency and customer confidence. Ultimately, the cement bag leaving the plant carries not only cement but also the reputation and responsibility of the manufacturer.
References
- Hewlett, P.C., & Liska, M. (2019). Lea’s Chemistry of Cement and Concrete. Butterworth-Heinemann.
- Schneider, M., Romer, M., Tschudin, M., & Bolio, H. (2011). Sustainable cement production. Cement and Concrete Research, 41(7), 642–650.
- International Cement Review. (2023). Advances in cement packaging and logistics systems.
- World Business Council for Sustainable Development (2021). Cement Industry Supply Chain Innovation Report.
- Gartner, E., & Hirao, H. (2015). Reducing CO2 emissions in cement production. Cement and Concrete Research.
- ScienceDirect Industry Studies. (2024). Operational efficiency benchmarks and overall equipment effectiveness in industrial manufacturing systems.
- World Cement Association. (2022). Digital Transformation in Cement Manufacturing and Logistics. London.
- Towards Packaging Research. (2024). Global cement
packaging market trends and technology outlook. Industry Market Analysis Report. - Towards Packaging Research. (2024). Global cement
packaging market trends and technology outlook. Industry Market Analysis Report.
About the author:
Dr SB Hegde is a Professor at Jain College of Engineering, Karnataka, and Visiting Professor at Pennsylvania State University, USA. With 248 publications and 10 patents, he specialises in low-carbon cement, Industry 4.0, and sustainability, consulting with cement companies to support India’s net-zero goals.
Table 1. Key Operational Parameters for Cement Packaging Systems
Parameter Typical Industry Range Recommended Target Operational Significance
Rotary packer capacity 2400–3600 bags/hr 3000–4000 bags/hr Improves despatch efficiency
Bag weight tolerance ±0.5 kg ±0.25 kg Reduces customer complaints
Bag leakage rate 1 per cent to 2 per cent <0.5 per cent Minimises cement loss Packing accuracy 98 per cent to 99 per cent >99.5 per cent Ensure compliance with standards
Truck loading time 30–45 minutes 20–30 minutes Improves logistics efficiency
Table 2. Causes of Cement Quality Degradation During Distribution
Factor Typical Cause Impact on Cement
Moisture exposure Poor storage or rain exposure Lump formation
Long storage duration Slow inventory turnover Loss of early strength
Bag damage Rough handling Cement loss
Improper stacking Excessive loading Bag rupture
Counterfeit bag reuse Refilling of empty bags Brand damage
Table 3. Comparison of Cement Bag Traceability Technologies
Technology Advantages Limitations
Printed batch code Low cost and simple Limited traceability
Barcode Fast scanning Requires equipment
QR code Smartphone verification Requires digital platform
RFID tagging Automated tracking Higher cost
Blockchain systems High transparency Complex implementation
Economy & Market
SEW-EURODRIVE India Opens Drive Technology Centre in Chennai
Published
3 weeks agoon
March 25, 2026By
admin
The new facility strengthens SEW-EURODRIVE India’s manufacturing, assembly and service capabilities
SEW-EURODRIVE India has inaugurated a new Drive Technology Centre (DTC) in Chennai, marking a significant expansion of its manufacturing and service infrastructure in South India. The facility is positioned to enhance the company’s responsiveness and long-term support capabilities for customers across southern and eastern regions of the country.
Built across 12.27 acres, the facility includes a 21,350-square-metre assembly and service setup designed to support future industrial growth, evolving application requirements and capacity expansion. The centre reflects the company’s long-term strategy in India, combining global engineering practices with local manufacturing and service capabilities.
The new facility has been developed in line with green building standards and incorporates sustainable features such as natural daylight utilisation, solar power generation and rainwater harvesting systems. The company has also implemented energy-efficient construction and advanced climate control systems that help reduce shopfloor temperatures by up to 3°C, improving production stability, product quality and working conditions.
A key highlight of the centre is the 15,000-square-metre assembly shop, which features digitisation-ready assembly cells based on a single-piece flow manufacturing concept. The facility also houses SEW-EURODRIVE India’s first semi-automated painting booth, aimed at ensuring uniform surface finish and improving production throughput.
With the commissioning of the Chennai Drive Technology Centre, SEW-EURODRIVE India continues to strengthen its manufacturing footprint and reinforces its long-term commitment to supporting industrial growth and automation development in India.
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