Present Situation and Prospect of Large-Scale Disposal and High Value-Added Utilization of Coal Gangue
Coal gangue has large production stock,low utilization rate and serious pollution.It is urgent to carry out large-scale comprehensive utilization according to the physical and chemical properties of coal gangue.The large-scale harmless consumption methods were summarized,such as separation zone filling,soil improvement and reclamation of cultivated land in the coal gangue goaf.The methods of respectively using coal gangue containing valuable elements such as aluminum,kaolin mineral composition,high contents of beneficial elements such as nitrogen,phosphorus and potassium,as well as low contents of harmful heavy metals to produce aluminum salt chemical products,kaolin and agricultural fertilizer were briefly described.The comprehensive utilization of coal gangue as roadbed and building materials was reviewed,and the problems of incomplete treatment of coal gangue and secondary pollution in the existing technology were analyzed.It is proposed to establish a high value-added utilization industry chain of"multi-step,hierarchical and classification".The residues of agricultural fertilizers can be used for soil improvement and reclamation of cultivated land.The solid waste in calcined kaolin can be used for low-standard building materials or roadbeds.The multi-level utilization of coal gangue extends coal gangue from high value-added utilization to mine filling,and realizes large-scale consumption of coal gangue with high added value.
Coal gangueFilling miningComprehensive utilizationHierarchical and classificationHigh added value
万方数据
维普
