The Spanish consortium, UTE ORURO, awarded a contract to Claudius Peters Projects for the delivery of a new packing and palletizing plant for a new cement plant in Oruro (Bolivia).
UTE ORURO is a consortium consisting of Sacyr Industrial and Imasa Ingenieria y Proyectos S.A. They received the order together with ThyssenKrupp Industrial Solutions. The final customer, Empresa Publica Productiva Cementos de Bolivia, is a state-run cement producer who had planned a clinker capacity of 3000 t/day for the new plant.
Due to the maintenance friendly and very energy efficient equipment the customer decided to select a machine from the PACPAL product group. Furthermore, an optimal plant arrangement which requires low space for the packing and palletizer building was important for the client.
Scope of supply
- The rotary feeder, Claudius Peters PACPAL Roto Fill with 12 filling modules for a capacity of 3,600 bags/hr
- The automatic bag applicator with a cassette magazine of 5 m length, appr. 1,125 bags
- The spillage return transport consisting of two trough screw conveyors
- The palletizer Claudius Peters PACPAL Palletizer 5000 for 3,600 bags/h with a slip sheet system for handling of palletless packages.
- The big bag filling station for one loop big bags with a weight of 500 kg up to 2000 kg per big bag.
- A control system made by Rockwell was used.
Advantages of the PACPAL Technology
The PACPAL Roto fill has a modular concept. This design is used for more than 25 years and is permanently developed further. The main advantage of the modular design is the independent and self-optimizing filling process for each filling turbine. The operation of the modules is not coupled and each filling module is responsible for the own filling process and the weighing of the bag. Therefore, a high availability of the packing machine is always guaranteed, even in case a filling module fails. Another advantage of this technology is a quick enlargement to increase the packing capacity. The replacement of an individual module can be done within short and optimizes maintenance work at the equipment.
Upstream dedusting on PACPAL Roto Fill:
The Claudius Peters upstream dedusting system allows a trouble-free and nearly dust-free filling process. The dust which arises when filling the cement into the bag is sucked upwards to the main filter by means of suitable "dedusting channels". The low quantity of remaining cement which occurs inevitably during rejection and finishing of the filling process is collected in the spillage funnel and fed into the spillage return system by gravity. It is not necessary to suck the cement below the packing plant and facilitates the design of the spillage return system considerably since no depression exists in the spillage funnels (discharge units such as e. g. double pendulum flaps are not necessary). This arrangement allows a maintenance friendly and therefore a cost-effective operation for the customer
Easy access and easy maintenance
The advantages of the PACPAL technology can be seen from the example of the PACPAL Roto Fill. A modular design, independently working filling systems with corresponding weighing electronics as well as an optimum access to all components allows a quick and simple maintenance of all necessary wear and spare parts. Furthermore, we ensure a simple and user friendly control of the individual components and the complete packing and palletizer plant. Claudius Peters? PACPAL philosophy is to have a simple and comprehensive structure of the machine technology and high technical perfection and know how. The operator and user understand the PACPAL machines and control all important functions on his own.
Supply and design of wear and spare parts
Claudius Peters gives up a coding of the individual spare and wear parts, hence, the client has the possibility to purchase these parts quickly and efficiently. Much attention is given to a simple and functional design. A complicated and high production expenses for components prevent a local supply and increase considerably the operating costs of a plant. The PACPAL program offers the possibility to replace easily the wear and spare parts. The Claudius Peters After Sales and the Spare Part Service offers any support for the exchange of spare parts.
Quick and Efficient Engineering
Due to special engineering programs such as e. g. engineering base, Claudius Peters is in a position to prepare all necessary documentation in a very short time. These are mainly the flow sheets with all necessary process data, motor and instrumentation lists as well as all additional information which are necessary to develop a complete packing and palletizing process. The advantage of Claudius Peters?customers is a quick execution of all important project steps after placing the order.
The supply of the packing and palletizer plant for Bolivia comprises all relevant core technologies which are necessary for the realization of this task. One special challenge is the altitude which is 4,000 m AMSL. This requires special motors and special electrical switching and control elements which are suitable for this altitude. The shown advantages of the PACPAL technology ensure a trouble-free and cost efficient as well as low maintenance operation of the plant. Claudius Peters will do his utmost to meet customer?s expectations. The delivery of the plant components is scheduled for 2017.
With this order, Claudius Peters links up to his product program for cement bagging and palletizing plants introduced successfully under the brand-name PACPAL.
For more information contact:
Claudius Peters (India) Private Limited
Web page: www.claudiuspeters.com
(Communication by the management of the company)
Environmental concerns and depleting natural resources, and the impact of cement production on the two are imminent issues that cement companies need to address on priority. Supplementary cementitious materials procured from industrial wastes is one way of looking at this colossal problem. ICR examines the changes made in company protocol with regards to sourcing of alternative materials and their overall impact.
Before we dive into the subject of supplementary cementitious materials, let us look at some of the key facts about cement production. India is the second largest producer of cement in the world. Limestone is at the core of its production as it is the prime raw material used for production. The process of making cement involves extraction of this limestone from its quarries, crushing and processing it at the cement plant under extreme temperatures for calcination to form what is called a clinker (a mixture of raw materials like limestone, silica, iron ore, fly ash etc.). This clinker is then cooled down and is ground to a fine powder and mixed with gypsum or other additives to make the final product – cement. The reason we are elucidating the cement production process is to look at how supplementary cementitious materials or SCM can be incorporated into it to make the process not only more cost effective but also environmentally responsible.
Limestone is a sedimentary rock composed typically of calcium carbonate (calcite) or the double carbonate of calcium and magnesium (dolomite). It is commonly composed of tiny fossils, shell fragments and other fossilised debris. This sediment is usually available in grey colour, but it may also be white, yellow or brown. It is a soft rock and is easily scratched. It will effervesce readily in any common acid. This naturally occurring deposit is depleting from the environment due to its extensive use in cement manufacturing process. Its extraction is the cause of dust pollution as well as some erosion in the nearby areas.
The process of calcination while manufacturing cement is a major contributor to carbon emission in the environment. This gives rise to the need of using alternative raw materials to the cement making process. The industry is advancing in its production swiftly to meet the needs of development happening across the nation.
According to the India Brand Equity Foundation (IBEF), the cement demand in India is estimated to touch 419.92 MT by FY 2027. As India has a high quantity and quality of limestone deposits through-out the country, the cement industry promises huge potential for growth. India has a total of 210 large cement plants out of which 77 are in the states of Andhra Pradesh, Rajasthan, and Tamil Nadu. Nearly 33 per cent of India’s cement production capacity is based in South India, 22 per cent in North India, 13 per cent in Central and West India, and the remaining 19 per cent is based in East India. As per Crisil Ratings, the Indian cement industry is likely to add approximately 80 million tonnes (MT) capacity by FY24, the highest since the last 10 years, driven by increasing spending on housing and infrastructure activities.
The Indian cement production overall stood at 263.12 million tonnes in 2021, and it is expected to reach 404.11 million tonnes by 2029 with a CAGR of 5.51 per cent during the forecast period, suggests a report published by Maximize Market Research in September 2022.
The production capacity and demand of cement in the country is increasing and is expected to grow at a steady rate in the years to come. The country is moving towards urbanisation and is building projects for the development of the nation. However, it is also imperative that the industry holds accountability of the environment and emission from this production activity and creates sustainable solutions to meet the demands as well as safeguard the planet as well.
India has pledged to achieve Net Zero by 2070 at the Glasgow Climate summits.
Environmental concerns and depleting natural resources are edging the cement industry to look at alternative materials for their manufacturing process.
Composition and Impact of SCM
Cement manufacturers know that to reduce CO2 emissions in the process of cement making, it is essential to change its composition. The raw mix of approximately 90 per cent limestone should be substituted with other materials with similar properties.
These materials, known as supplementary cementitious materials contribute to the properties of hardened concrete through hydraulic or pozzolanic activity. Typical examples are fly ashes, slag cement (ground, granulated blast-furnace slag), silica fumes etc. These can be used individually with portland or blended cement or in different combinations. SCM are often added to concrete to make concrete mixtures more economical, reduce permeability, increase strength, or influence other concrete properties. SCM may be added during cement manufacturing for a more consistent blended cement.
Some of the commonly used supplementary cementitious materials are:
Fly Ash: This material contains a substantial amount of silicone dioxide and calcium oxide. It is a fine, light, glassy residue, most widely used SCM in concrete and is a byproduct of coal combustion in electric power generating plants. Fly ash can compensate for fine materials that may be lacking in sand quantities and can be very beneficial
in improving the flowability and finishability of concrete mixtures.
Ground Granulated Blast-furnace Slag (GGBS): It is a by-product of the iron and steel industry. In the blast furnace, slag floats to the top of the iron and is removed. GGBS is produced through quenching the molten slag in water and then grinding it into a fine powder. Chemically it is like, but less reactive than, Portland cement.
Silica Fume: It is a by-product from the manufacture of silicon. It is an extremely fine powder (as fine as smoke) and therefore it is used in concrete production in either a densified or slurry form.
Slag: It is a by-product of the production of iron and steel in blast furnaces. The benefits of the partial substitution of slag for cement are improved durability, reduction of life-cycle costs, lower maintenance costs, and greater concrete sustainability. The molten slag is cooled in water and then ground into a fine powder.
Limestone Fines: These can be added in a proportion of 6 to 10 per cent as a constituent to produce cement. The advantages of using these fines are reduced energy consumption and reduced CO2 emissions.
Gypsum: A useful binding material, commonly known as the Plaster of Paris (POP), it requires a temperature of about 150oC to convert itself into a binding material. Retarded plaster of Paris can be used on its own or mixed with up to three parts of clean, sharp sand. Hydrated lime can be added to increase its strength and water resistance.
Cement Kiln Dust: Kilns are the location where clinkerisation takes place. It leaves behind dust that contains raw feed, partially calcined feed and clinker dust, free lime, alkali sulphate salts, and other volatile compounds. After the alkalis are removed, the cement kiln dust can be blended with clinker to produce acceptable cement.
Pozzolanas: These materials are not necessarily cementitious. However, they can combine chemically with lime in the presence of water to form a strong cementing material. They can include – volcanic ash, power station fly ash, burnt clays, ash from burnt plant materials or siliceous earth materials.
SCM used in conjunction with Portland cement contribute beneficially to the properties of concrete through hydraulic or pozzolanic activity or both. Hydraulic materials (e.g., slag cement), like Portland cement itself, will set and harden when mixed with water. Pozzolanic materials require a source of calcium hydroxide (CH) to set, which is supplied by Portland cement during the hydration process. The right dosage of strategically chosen SCM can improve both the fresh and hardened properties of a concrete mixture.
Prakhar Shrivastava, Head – Corporate Quality, JK Cement Limited, says, “We manufacture Portland Pozzolana Cement (PPC) from all our plants with addition of flyash up to 35 per cent and PPC in premium category with 20 per cent flyash to promote usage of only blended cement to fulfil customer requirements by achieving equivalent strength properties of Ordinary Portland Cement (OPC). At our south India plant in Muddapur, we also manufacture Portland Slag Cement (PSC) with the addition of slag at approximately 65 per cent, meeting all the internal product quality norms.”
“The production of Ordinary Portland Cement (OPC) is continuously declining, with a simultaneous increase in the production of blended cement like PPC, PSC, and Composite Cement based on flyash and granulated blast furnace slag. SCMs are increasingly used to minimise cement-related CO2 emissions and increase plant efficiency from an economic and environmental perspective,” he adds.
Achieving Sustainability through Substitution
Cement is the most used man-made material globally. The rising demand for infrastructure and development of the nation is showing a clear indication of increased production of cement, thus raising concerns about natural resources, environment, and emission of carbon. One of the widely adopted solutions for ensuring sustainability in cement manufacturing is reducing the clinker-to-cement ratio by adding supplementary cementitious materials.
In his authored article, Dr S B Hegde, Visiting Professor, Pennsylvania State University, United States of America, states, “Concrete is one of the most widely used materials after water worldwide by volume. Portland cement production is highly energy intensive, and emits significant amounts of CO2 through the calcination process, which contributes substantial adverse impact on global warming. Efforts are needed to produce more ecologically friendly concrete with improved performance and durability.”
“The conventional SCM are not enough considering the quantity of concrete requirement for infra development worldwide and to mitigate global warming issue; there is a pressing need to explore the new SCM, its characterisation, performance evaluation, standardisation and adoption,” he adds.
The CO2 emissions from cement production are the third largest source of difficult-to-eliminate emissions, after load-following electricity and iron and steel. Beyond greenhouse gas (GHG) emissions, the production of concrete and mortar causes over approximately three per cent of global energy demand, over five per cent of global anthropogenic particulate matter (PM10) emissions, and approximately two per cent of global water withdrawals. These environmental impacts may be reduced through various technical (energy, emissions, and material efficiency) measures, of which cementitious materials (CM) substitution (including complete and partial substitution) is one of the most promising.
The manufacturing process of cement can become sustainable by measuring the impact of supplementary materials that can be added to the raw meal of cement. Various materials, naturally occurring or man-made or wastes should be studied and consequently should be included in the cement production process to create blended cements that not only meet the rising demands of the world in terms of quality and strength, but at the same time meet environmental concerns. Research, innovation and technology is key to making a difference in the segment of cement manufacturing by studying more materials that can be used as supplementary materials in cement and concrete, by crafting new compositions and blends of cement and crafting equipment that support the same.
One of the most important ways of reducing carbon emission in cement manufacturing is the use of alternative raw materials from various other industries. This gives way to a circular economy, utilising waste from other industries and bettering the environment with reduced emission of harmful gases, especially carbon dioxide. It also helps the avoidance of landfills or ocean pollution, as waste of industries is utilised in manufacturing cement. Overall, new compositions of cement are the future. The nation’s economy can greatly benefit from a growing cement industry and business sector, however, it should pay keen attention on finding pathways to safeguard the environment its people reside in.
#ChangeTheStory bags a gold
#ChangeTheStory, a joint initiative by Ambuja Cements and ACC to create awareness about sustainability and the environment, has won the gold award under the environment category at Imagexx Awards by Adgully.
As part of this integrated campaign, the two cement makers launched a bubble barrier technology that has fished out as much as 2,400 tonnes of plastic waste till date from the Mantola canal in Agra. This has directly contributed to the cleanliness of the Yamuna, one of India’s most iconic, important and holy rivers. #ChangeTheStory has thus shown sustainability measures backed by technology can leave a lasting, positive and measurable impact on our environment. The initiative has till date reached out to around 32 million people, through print and digital mediums.
Images Source: Google Images
ACC acts on curbing emissions
ACC Ltd has adopted an advanced technological approach to control carbon emissions.
The company has installed advanced primary and secondary abatement measures in addition to regular maintenance of equipment at its manufacturing locations across the country to minimise air emissions. This helps ACC to comply with the emission limit value mandated by various regulators.
ACC has also installed continuous emission monitoring systems at all of its 17 cement plants to monitor air emissions. Air quality is also monitored through the continuous ambient air quality monitoring stations. All plants have high efficiency bag filters in all operations, with the latest electrostatic precipitators deployed in clinker cooler applications.
The company has also taken several measures to reduce CO2 emissions, such as reducing the clinker factor, improving thermal substitution rate, implementing waste heat recovery system and increasing the rate of renewable energy consumption.
Images Source: Google Images