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Transforming mining safe & productive

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Underground mining is an extremely tough mining method with various risk factors involved. But the evolution of digital technologies and automation, and the technologically advanced equipment are transforming the underground mining operations safe and productive.

With mines are going deeper and minerals on the earth surface depleting faster, underground mining is the option to mine the huge deposits of minerals and coal hidden deep under the earth. However, it is a daunting task to go deep under the earth and mine the minerals. While certain minerals like zinc and copper are mined using underground mining methods, high grade coal is mined from the deep, by underground mining method. Since the coal deposits in the earth surface are fast exhausting, coal miners in future will have to depend on the coal deposits deep underground.

Underground mining in India
The Indian mining sector contributes around 3 per cent of the GDP. According to Kush Tandon, Commercial Manager, Underground Mining – India, Caterpillar Global Mining, India hosts underground metal mines as well as underground coal mines. "The geology of metallic mineral ore bodies differs greatly from the bedded seams of coal. As a result, the methods and machines to mine metal ores differ entirely from those used to mine coal underground," he explains. Major minerals mined through underground mining in India are zinc, silver, copper, gold, manganese, chromite and uranium. All major underground metal mining companies are bracing for challenges such as rapid increase in production with mechanisation and cost reduction. Exploration is being carried out at various locations in the country to identify new mineral reserves. There is an increasing trend of continuous mining mechanisation in coal mining by adopting continuous miners in underground coal.

Hindustan Zinc (HZL) and Hindustan Copper (HCL) are the two major players in underground mining in India. According to recent reports, the government-owned HCL is planning to re-open its closed mines and expand existing ones in its quest to increase ore production five times from the current level of 4.1 million tonne per annum (mtpa) by 2025. The company, which is also keen on bagging new mines, is expected to spend around Rs 60 billion in this endeavour. HZL, a subsidiary of Vedanta Resources, plans to invest Rs 80 billion in the next 3-5 years to expand its operations and capacity. The company aims to take the existing ore production levels of 9.36 mtpa to 14 mtpa and finished metal production to 1.10 mtpa from 0.85 mtpa.

Risk factors
Once a decision has been made to go underground, the specific mining method is selected depending on the size, shape, and orientation of the ore body, the grade of mineralisation, the strength of the rock materials, and the depths involved. As one goes deeper into the earth, the thickness and, consequently, weight of the overlying rock increase. Pressure from the sides also increases with depth; the amount of this pressure depends on the rock type and the geologic situation. In the world’s deepest mines, which are more than 4 km below the surface, pressure becomes so intense that the rock literally explodes. These rock bursts are major limitations to mining at depth.

"Complexities in underground mining are somewhat different compared to surface mining methods. These challenges emanate from inherent geology and rock conditions. Also, space restrictions, ventilation, lighting, supporting roof and safety issues arising from man machine interface are other challenges," explains Shib Bhowmik, Managing Director, Komatsu Mining Corp, India.

Technology to mitigate risks
Technology improves safety and productivity. With the help of digital and IoT-based technologies, safety risks can be minimised and the overall productivity of mining underground can be improved. Anirban Sen, Business Line Manager – Underground Rock Excavation, Epiroc Mining India, says, "Underground mining involves high risks, but we can see the trend to mitigate risks and also investing in modern machinery giving high importance to safety and productivity."

According to Sunil Duggal, CEO, Hindustan Zinc, the need of the hour is not just mining, but mining with better safety, cost and in a sustainable manner. Rightly, underground mines in India are focused on increased use of technology and skill upgradation to adapt technologies to increase efficiency and productivity, and minimising the cost to gain competitive advantage.

Market outlook
Major underground mining players are looking for expanding operations and increase production in the coming years due to an expected demand growth for metals like copper, zinc, lead etc in the coming years. Sen elaborates, "The projected demand of copper due to electric vehicles is expected to increase by 1.7 mt by 2027. With 0.66 mt of refined copper consumption in 2017-18 and the current consumption growth rate at 6-8 per cent and the additional demand of 1.7 mt from copper-intensive electric vehicles, the total demand for copper is projected at 2.6-2.7 mt by 2023-24."

According to him, the industry estimates suggest 5-6 per cent annual demand growth for zinc in the coming years. "For lead, growth in automobile sector is the major driving factor. Around 75 per cent of the lead consumed in India is accounted by the lead battery segment. According to the second Automotive Mission Plan 2016-26 (AMP 20126), the Indian automotive industry is expected to grow to $300 billion by 2026, thus driving the demand for lead in the country," adds Sen.

According to Duggal, the underground operation in India is on the verge of transition from the conventional to the autonomous operation. "In the near future, there will be hardly any deposits left near surface and hence the underground operation shall become more prominent. The future depends on how well we are prepared to address the deeper mining challenges," he concludes.

In spite of the high risk and investment involved, underground mining can become safe and productive with the help of modern technologies and proper utilisation of the equipment and technologies.

Challenges in underground mining
– Anirban Sen, Business Line Manager,
Underground Rock Excavation, Epiroc Mining India
Global factors:
Over the last one year, the international market has witnessed a downward pressure in the commodities prices due to rising supply from major producers and moderating demand from China due to its stringent environment policy measure. This has impacted the bottom lines of mining companies, thereby leading to limited investment undertaken by them.

Risk and uncertain geological complexity: The very nature of mineral exploration has a high proportion of unforeseen challenges and complexities. The reserve in place may be established, but the economic feasibility of mining can vary significantly. This, in turn, makes the outlook for a given mining project uncertain and complex.

Huge potential untapped due to regulatory logjams: One of the biggest challenges is the lack of co-ordination among various government entities associated with the mining industry.

Local agitations: Local communities often protest against exploration activities that fear a loss of livelihood as a result.

Mining intelligence & asset optimisation from Epiroc
From a cost-effective deployment and reuse of the existing datacom infrastructure, Mobilaris can deliver a Mining Intelligence Solution that:

  • Increases the overall production efficiency between 10-20 per cent
  • Lowers operational costs
  • Increases the personal safety in underground mines
  • Delivers position data and decision support to other existing mine automation applications
  • By connecting machines with Certiq the whole global fleet can be monitored.
  • The data is communicated via Mobile network, Satellite, Wi-Fi or whatever available.
  • All data is then processed in our central server and made available to all users.
  • The customer can access the data on the web portal, via sms, reports or integrated into their ERP system.

Automation: Automation concept contains four levels of automation. From data monitoring and product function control, to calculated optimisation and in the end, full autonomy. Combining all steps allows you to reach the full potential of Epiroc?s equipment. When the machines work together, they can perform very complicated tasks, deep underground. And they can do so with minimal downtime and maximum safety.

– SUDHEER VATHIYATH

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Economy & Market

Impactful Branding

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Advertising or branding is never about driving sales. It’s about creating brand awareness and recall. It’s about conveying the core values of your brand to your consumers. In this context, why is branding important for cement companies? As far as the customers are concerned cement is simply cement. It is precisely for this reason that branding, marketing and advertising of cement becomes crucial. Since the customer is unable to differentiate between the shades of grey, the onus of creating this awareness is carried by the brands. That explains the heavy marketing budgets, celebrity-centric commercials, emotion-invoking taglines and campaigns enunciating the many benefits of their offerings.
Marketing strategies of cement companies have undergone gradual transformation owing to the change in consumer behaviour. While TV commercials are high on humour and emotions to establish a fast connect with the customer, social media campaigns are focussed more on capturing the consumer’s attention in an over-crowded virtual world. Branding for cement companies has become a holistic growth strategy with quantifiable results. This has made brands opt for a mix package of traditional and new-age tools, such as social media. However, the hero of every marketing communication is the message, which encapsulates the unique selling points of the product. That after all is crux of the matter here.
While cement companies are effectively using marketing tools to reach out to the consumers, they need to strengthen the four Cs of the branding process – Consumer, Cost, Communication and Convenience. Putting up the right message, at the right time and at the right place for the right kind of customer demographic is of utmost importance in the long run. It is precisely for this reason that regional players are likely to have an upper hand as they rely on local language and cultural references to drive home the point. But modern marketing and branding domain is exponentially growing and it would be an interesting exercise to tabulate and analyse its impact on branding for cement.

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Concrete

Indian cement industry is well known for its energy and natural resource efficiency

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Dr Hitesh Sukhwal, Deputy General Manager – Environment, Udaipur Cement Works Limited (UCWL) takes us through the multifaceted efforts that the company has undertaken to keep emissions in check with the use of alternative sources of energy and carbon capture technology.

Tell us about the policies of your organisation for the betterment of the environment.
Caring for people is one of the core values of our JK Lakshmi Cement Limited. We strongly believe that we all together can make a difference. In all our units, we have taken measures to reduce carbon footprint, emissions and minimise the use of natural resources. Climate change and sustainable development are major global concerns. As a responsible corporate, we are committed with and doing consistent effort small or big to preserve and enrich the environment in and around our area of operations.
As far as environmental policies are concerned, we are committed to comply with all applicable laws, standards and regulations of regulatory bodies pertaining to the environment. We are consistently making efforts to integrate the environmental concerns into the mainstream of the operations. We are giving thrust upon natural resource conservation like limestone, gypsum, water and energy. We are utilising different kinds of alternative fuels and raw materials. Awareness among the employees and local people on environmental concerns is an integral part of our company. We are adopting best environmental practices aligned with sustainable development goals.
Udaipur Cement Works Limited is a subsidiary of the JK Lakshmi Cement Limited. Since its inception, the company is committed towards boosting sustainability through adopting the latest art of technology designs, resource efficient equipment and various in-house innovations. We are giving thrust upon renewable and clean energy sources for our cement manufacturing. Solar Power and Waste Heat Recovery based power are our key ingredients for total power mix.

What impact does cement production have on the environment? Elaborate the major areas affected.
The major environmental concern areas during cement production are air emissions through point and nonpoint sources due to plant operation and emissions from mining operation, from material transport, carbon emissions through process, transit, noise pollution, vibration during mining, natural resource depletion, loss of biodiversity and change in landscape.
India is the second largest cement producer in the world. The Indian cement industry is well known for its energy and natural resource efficiency worldwide. The Indian cement industry is a frontrunner for implementing significant technology measures to ensure a greener future.
The cement industry is an energy intensive and significant contributor to climate change. Cement production contributes greenhouse gases directly and indirectly into the atmosphere through calcination and use of fossil fuels in an energy form. The industry believes in a circular economy by utilising alternative fuels for making cement. Cement companies are focusing on major areas of energy efficiency by adoption of technology measures, clinker substitution by alternative raw material for cement making, alternative fuels and green and clean energy resources. These all efforts are being done towards environment protection and sustainable future.
Nowadays, almost all cement units have a dry manufacturing process for cement production, only a few exceptions where wet manufacturing processes are in operation. In the dry manufacturing process, water is used only for the purpose of machinery cooling, which is recirculated in a closed loop, thus, no polluted water is generated during the dry manufacturing process.
We should also accept the fact that modern life is impossible without cement. However, through state-of-the-art technology and innovations, it is possible to mitigate all kinds of pollution without harm to the environment and human beings.

Tell us about the impact blended cement creates on the environment and emission rate.
Our country started cement production in 1914. However, it was introduced in the year 1904 at a small scale, earlier. Initially, the manufacturing of cement was only for Ordinary Portland Cement (OPC). In the 1980s, the production of blended cement was introduced by replacing fly ash and blast furnace slag. The production of blended cement increased in the growth period and crossed the 50 per cent in the year 2004.
The manufacturing of blended cement results in substantial savings in the thermal and electrical energy consumption as well as saving of natural resources. The overall consumption of raw materials, fossil fuel such as coal, efficient burning and state-of-the-art technology in cement plants have resulted in the gradual reduction of emission of carbon dioxide (CO2). Later, the production of blended cement was increased in manifolds.
If we think about the growth of blended cement in the past few decades, we can understand how much quantity of , (fly ash and slag) consumed and saved natural resources like limestone and fossil fuel, which were anyhow disposed of and harmed the environment. This is the reason it is called green cement. Reduction in the clinker to cement ratio has the second highest emission reduction potential i.e., 37 per cent. The low carbon roadmap for cement industries can be achieved from blended cement. Portland Pozzolana Cement (PPC), Portland Slag Cement (PSC) and Composite Cement are already approved by the National Agency BIS.
As far as kilogram CO2 per ton of cement emission concerns, Portland Slag Cement (PSC) has a larger potential, other than PPC, Composite Cement etc. for carbon emission reduction. BIS approved 60 per cent slag and 35 per cent clinker in composition of PSC. Thus, clinker per centage is quite less in PSC composition compared to other blended cement. The manufacturing of blended cement directly reduces thermal and process emissions, which contribute high in overall emissions from the cement industry, and this cannot be addressed through adoption of energy efficiency measures.
In the coming times, the cement industry must relook for other blended cement options to achieve a low carbon emissions road map. In near future, availability of fly ash and slag in terms of quality and quantity will be reduced due to various government schemes for low carbon initiatives viz. enhance renewable energy sources, waste to energy plants etc.
Further, it is required to increase awareness among consumers, like individual home builders or large infrastructure projects, to adopt greener alternatives viz. PPC and PSC for more sustainable
resource utilisation.

What are the decarbonising efforts taken by your organisation?
India is the world’s second largest cement producer. Rapid growth of big infrastructure, low-cost housing (Pradhan Mantri Awas Yojna), smart cities project and urbanisation will create cement demand in future. Being an energy intensive industry, we are also focusing upon alternative and renewable energy sources for long-term sustainable business growth for cement production.
Presently, our focus is to improve efficiency of zero carbon electricity generation technology such as waste heat recovery power through process optimisation and by adopting technological innovations in WHR power systems. We are also increasing our capacity for WHR based power and solar power in the near future. Right now, we are sourcing about 50 per cent of our power requirement from clean and renewable energy sources i.e., zero carbon electricity generation technology. Usage of alternative fuel during co-processing in the cement manufacturing process is a viable and sustainable option. In our unit, we are utilising alternative raw material and fuel for reducing carbon emissions. We are also looking forward to green logistics for our product transport in nearby areas.
By reducing clinker – cement ratio, increasing production of PPC and PSC cement, utilisation of alternative raw materials like synthetic gypsum/chemical gypsum, Jarosite generated from other process industries, we can reduce carbon emissions from cement manufacturing process. Further, we are looking forward to generating onsite fossil free electricity generation facilities by increasing the capacity of WHR based power and ground mounted solar energy plants.
We can say energy is the prime requirement of the cement industry and renewable energy is one of the major sources, which provides an opportunity to make a clean, safe and infinite source of power which is affordable for the cement industry.

What are the current programmes run by your organisation for re-building the environment and reducing pollution?
We are working in different ways for environmental aspects. As I said, we strongly believe that we all together can make a difference. We focus on every environmental aspect directly / indirectly related to our operation and surroundings.
If we talk about air pollution in operation, every section of the operational unit is well equipped with state-of-the-art technology-based air pollution control equipment (BagHouse and ESP) to mitigate the dust pollution beyond the compliance standard. We use high class standard PTFE glass fibre filter bags in our bag houses. UCWL has installed the DeNOx system (SNCR) for abatement of NOx pollution within norms. The company has installed a 6 MW capacity Waste Heat Recovery based power plant that utilises waste heat of kiln i.e., green and clean energy source. Also, installed a 14.6 MW capacity solar power system in the form of a renewable energy source.
All material transfer points are equipped with a dust extraction system. Material is stored under a covered shed to avoid secondary fugitive dust emission sources. Finished product is stored in silos. Water spraying system are mounted with material handling point. Road vacuum sweeping machine deployed for housekeeping of paved area.
In mining, have deployed wet drill machine for drilling bore holes. Controlled blasting is carried out with optimum charge using Air Decking Technique with wooden spacers and non-electric detonator (NONEL) for control of noise, fly rock, vibration, and dust emission. No secondary blasting is being done. The boulders are broken by hydraulic rock breaker. Moreover, instead of road transport, we installed Overland Belt Conveying system for crushed limestone transport from mine lease area to cement plant. Thus omit an insignificant amount of greenhouse gas emissions due to material transport, which is otherwise emitted from combustion of fossil fuel in the transport system. All point emission sources (stacks) are well equipped with online continuous emission monitoring system (OCEMS) for measuring parameters like PM, SO2 and NOx for 24×7. OCEMS data are interfaced with SPCB and CPCB servers.
The company has done considerable work upon water conservation and certified at 2.76 times water positive. We installed a digital water flow metre for each abstraction point and digital ground water level recorder for measuring ground water level 24×7. All digital metres and level recorders are monitored by an in-house designed IoT based dashboard. Through this live dashboard, we can assess the impact of rainwater harvesting (RWH) and ground water monitoring.
All points of domestic sewage are well connected with Sewage Treatment Plant (STP) and treated water is being utilised in industrial cooling purposes, green belt development and in dust suppression. Effluent Treatment Plant (ETP) installed for mine’s workshop. Treated water is reused in washing activity. The unit maintains Zero Liquid Discharge (ZLD).
Our unit has done extensive plantations of native and pollution tolerant species in industrial premises and mine lease areas. Moreover, we are not confined to our industrial boundary for plantation. We organised seedling distribution camps in our surrounding areas. We involve our stakeholders, too, for our plantation drive. UCWL has also extended its services under Corporate Social Responsibility for betterment of the environment in its surrounding. We conduct awareness programs for employees and stakeholders. We have banned Single Use Plastic (SUP) in our premises. In our industrial township, we have implemented a solid waste management system for our all households, guest house and bachelor hostel. A complete process of segregated waste (dry and wet) door to door collection systems is well established.

Tell us about the efforts taken by your organisation to better the environment in and around the manufacturing unit.
UCWL has invested capital in various environmental management and protection projects like installed DeNOx (SNCR) system, strengthening green belt development in and out of industrial premises, installed high class pollution control equipment, ground-mounted solar power plant etc.
The company has taken up various energy conservation projects like, installed VFD to reduce power consumption, improve efficiency of WHR power generation by installing additional economiser tubes and AI-based process optimisation systems. Further, we are going to increase WHR power generation capacity under our upcoming expansion project. UCWL promotes rainwater harvesting for augmentation of the ground water resource. Various scientifically based WHR structures are installed in plant premises and mine lease areas. About 80 per cent of present water requirement is being fulfilled by harvested rainwater sourced from Mine’s Pit. We are also looking forward towards green transport (CNG/LNG based), which will drastically reduce carbon footprint.
We are proud to say that JK Lakshmi Cement Limited has a strong leadership and vision for developing an eco-conscious and sustainable role model of our cement business. The company was a pioneer among cement industries of India, which had installed the DeNOx (SNCR) system in its cement plant.

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Concrete

NTPC selects Carbon Clean and Green Power for carbon capture facility

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Carbon Clean and Green Power International Pvt. Ltd has been chosen by NTPC Energy Technology Research Alliance (NETRA) to establish the carbon capture facility at NTPC Vindhyachal. This facility, which will use a modified tertiary amine to absorb CO2 from the power plant’s flue gas, is intended to capture 20 tonnes of CO2) per day. A catalytic hydrogenation method will eventually be used to mix the CO2 with hydrogen to create 10 tonnes of methanol each day. For NTPC, capturing CO2 from coal-fired power plant flue gas and turning it into methanol is a key area that has the potential to open up new business prospects and revenue streams.

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