Matching method of coal-based solid waste grouting filling material

Abstract

The invention relates to a matching method of a coal-based solid waste grouting and filling material, and provides a method for carrying out grouting and filling by matching two kinds of coal-based solid wastes including fly ash and ground gangue powder in the field of overlying strata isolation grouting and filling so as to solve the problems that a thermal power plant is high in fly ash transportation cost, insufficient in supply amount and polluted due to the fact that gangue occupies land. Further, the problems of compression performance, pumping performance and cost of the mixed slurry are synthesized, the problem of adding proportion (matching of fly ash amount) of the gangue powder is considered in a three-in-one manner, and the method for testing the compression performance and the pumping performance is unique and innovative; in addition, a matching test device is further designed, the device integrates smashing, pulping and compression bleeding into a whole and is applied to a matching test, the test efficiency is greatly improved, and the problem that the repeated test amount is large due to different adding proportions of gangue powder is solved.

Description

technical field [0001] The invention relates to the field of backfilling and mining of coal mines, and is an isolation grouting filling technology for overlying rocks in backfilling mining, in particular to a method for matching coal-based solid waste grouting filling materials. Background technique [0002] While the coal industry is booming and the output has increased significantly, coal mining technology and methods have made great progress, but a large number of environmental problems have followed. Huge economic losses have led to sharp contradictions between the development of mining resources and the harmonious living environment. The mining of coal under buildings is of great significance for liberating coal resources, alleviating the contradiction between resource development and human settlements, and protecting the environment. The overlying rock isolation grouting filling technology uses high pressure to inject the filling slurry into the separation layer by dr...

AI Technical Summary

Problems solved by technology

Gangue can be ground and refined to achieve the same particle size as fly ash, but the composition of gangue is very different from that of fly ash, and its physical properties are different from those of power plant fly ash. The pumpability and sedimentation speed are different from those of power plant fly ash. Generally speaking, the performance is not as good as that of fly ash, and the cost of gangue grinding is affected by the size of the ground particles.

However, the supply of fly ash is limited, and the cost is affected by the distance from the mining area to the power plant; therefore, the use of power plant fly ash or gangue alone has disadvantages, so it is necessary to study a matching method for gangue powder grouting filling materials. It can not only meet the needs of grouting filling, but also save costs

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