Study of the Granulability of Brown Coal Using Inorganic Binders
DOI:
https://doi.org/10.37134/jsml.vol14.2.11.2026Keywords:
Mineral additives, Dust formation, Economic effect, Regression model, Physical properties , Physical and mechanical propertiesAbstract
The aim of this research is to develop and evaluate a granulation technology for Kyrgyzstan's brown coal using inorganic binders, with the goal of improving its physical and mechanical properties. Experiments were conducted using a laboratory drum granulator with inorganic binders, preceded by analysis of physical and chemical properties, including elemental composition, ash content, calorific value, and particle size, of samples from the Kozho-Kelen and Kyzyl-Bulak deposits. Kyrgyzstan holds 24 billion tonnes of brown coal reserves (2.3 billion explored), with 2023 production reaching 4 million tonnes. Raw coal is characterised by moisture content of 40-50%, ash content of 12-15%, calorific value of 8-12 MJ/kg, and fine fractions (<5 mm) comprising 65-70%, with dust losses of up to 30%. Granulation with 10% inorganic binders raised the granulation coefficient to 85-95%, producing 4-8 mm granules with compressive strength up to 2.5 MPa (a 212% increase with Portland cement), reduced abrasiveness by 73% (to 12.3%), increased calorific value to 11.2 MJ/kg, and decreased porosity from 35% to 15%. The technology outperforms analogues from China (2.2 MPa, 18% ash) and Australia (2.0 MPa, 15% abrasiveness). Economic assessment for a 10,000 tonne/year operation shows savings of 2,500 tonnes of coal, an economic effect of USD 125,000, and a payback period of 1.5 years. At 50,000 tonnes/year, projected profit reaches USD 500,000. The technology raises brown coal value by 30-40%, supports environmental objectives, and aligns with Kyrgyzstan's national sustainable development priorities. The developed granulation technology offers significant economic and environmental benefits, supporting the sustainable development of the country's coal industry and reducing material losses and environmental pollution.
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