Prospects for utilizing coal washery wastes
Published Soviet research on the production of porous ballast (algoporite gravel) from coal washery wastes by sintering has led to pilot commercial development. Basic specification have been laid down for wastes to be used to make agloporite and a procedure has been worked out for blending various wastes into suitable mixtures for processing (contents of fuel substance and the oxides of elements which raise the softening point - Al, Si, Ti - and those which lower it - Fe, Ca, Mg, Na, K), together with the degree of coalification of the organic substance. This procedure can be used for approximate evaluations of the wastes from any particular undertaking, as raw material for agloporite production; practical tests are thereby avoided. Coal washery wastes are widely used as additives (up to 20%) in mixes for making ordinary building bricks. A technique has now been developed whereby ceramic products can be made from mixes with 70 to 100% washery wastes, by plastic or semidry pressing. Its main feature is that the materials are ground to below 0.5 mm, thereby greatly enhancing their plasticity. Constructional ceramics made from washery wastes are a superior product; they save on processing fuel (by 75 to 85%) and raw clay (by 70 to 100%). According to data on the physico-chemical properties of coal washery wastes, which are formed at the rate of 20 to 30 million tons/year, they can be processed and used as the basic raw material for agloporite or constructional ceramic products. Planning estimates indicate savings of 4 to 15 and 3 to 6 rubles/ton of waste used in the two products. Thus coal washery wastes should be regarded as a special type of secondary organic/inorganic material with various national economic uses.
- OSTI ID:
- 5647280
- Journal Information:
- Coke Chem. USSR (Engl. Transl.); (United States), Vol. 9; Other Information: Translated from Koks Khim.; No. 9, 39-42(1980)
- Country of Publication:
- United States
- Language:
- English
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32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COAL MINING
MINERAL WASTES
COAL PREPARATION PLANTS
CLASSIFICATION
MATERIALS RECOVERY
WASTE PRODUCT UTILIZATION
BOILER FUELS
BRICKS
BUILDING MATERIALS
CALCINATION
CEMENTS
CLEANING
CONCRETES
FERTILIZERS
MANUFACTURING
ROADS
CHEMICAL REACTIONS
DECOMPOSITION
FUELS
INDUSTRIAL PLANTS
MANAGEMENT
MATERIALS
MINING
PROCESSING
PYROLYSIS
RECOVERY
SOLID WASTES
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
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320305 - Energy Conservation
Consumption
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012000 - Coal
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013000 - Coal
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Handling
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