Abstract
Technologically contaminated water, formed during processing of coal slurries, finds its application in modern technological cycles of coal enrichment. Limitation of use of untreated recycled water of coal concentration plants is caused by a high degree of its mineralization by various salts, presence of insoluble solid particles and presence of flotation reagents, coagulants and flocculants. Part of technical water purified from mineral and organic contaminants can be used in heating systems and heat exchange equipment of industrial enterprises, including the coal industry. For this purpose, it is necessary to reduce the scale-forming ability of service water (to reduce the content of soluble calcium and magnesium salts in water). One of the most effective and advanced methods is the stabilization treatment of water with an electric field. In addition, this method is environmentally safe, low-cost and simple. The article gives the foundation of the method of stabilization treatment of recycled water of concentrating plants by an electric field, a description of the methodology of the laboratory experiment for scaling reduction, and the analysis of the results.
Highlights
The main disadvantage of coal concentration plants, which has a negative environmental impact, is the discharge of sludge water into external settling ponds
The applied staged schemes of sludge water treatment should provide the maximum use of treated water in the main technological processes
Sludge water purified from suspended solids, organic impurities and hardness salts can be used in heat supply systems of coal concentration plants
Summary
The main disadvantage of coal concentration plants, which has a negative environmental impact, is the discharge of sludge water into external settling ponds. Deep mechanical treatment of technological water from flocculants and flotation agents is realized with the use of appropriate sorbents. Passing these stages of treatment allows for removal of suspended mineral particles and organic ones. Sludge water purified from suspended solids, organic impurities and hardness salts can be used in heat supply systems of coal concentration plants. For this purpose, it is necessary to reduce scale-forming ability of sludge water, caused by the presence of hardness salts in it
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