Proportion optimization method of phosphogypsum-based solid waste filling material to improve filling rate

Abstract

The invention provides a proportion optimizing method of a phosphogypsum-based all-solid waste filler for improving a roof-contacted filling rate, and belongs to the technical field of environment-friendly filling mining. The method comprises the following steps: firstly performing mineral analysis and a particle size test on phosphogypsum and low-quality solid waste; performing a strength test and an expansion rate test on a filling body with different proportions of the phosphogypsum-based all-solid waste filler; establishing a strength and expansion rate mathematical model of the filling body based on the test results; establishing a proportion optimization model of the a phosphogypsum-based all-solid waste filler; and finally solving the proportion optimization model to obtain an optimized proportion of the phosphogypsum-based all-solid waste filler. The method makes full use of the self expandability of the phosphogypsum, realizes the proportion optimal combination and synergy ofmultiple low-quality solid waste, can avoid deterioration of the strength of the filling body caused by excessive expansion of the filling body, and can make the swellability of the phosphogypsum exerted to the utmost extent on the basis of meeting the strength of the filling body, thereby improving the roof-contacted filling rate of filling stope.

Description

technical field [0001] The invention relates to the technical field of green filling and mining, in particular to a method for optimizing the ratio of phosphogypsum-based all-solid waste filling materials to improve the filling rate. Background technique [0002] With the rapid development of my country's national economy and the continuous development and utilization of mineral resources, high-grade resources with good mining technical conditions are increasingly exhausted, and more mining resources are faced with deep burial, high stress, flooding and unfavorable conditions. For safety, environmental protection and green mining, the filling and filling mining method is the primary choice for resource mining at present. The full tailings cemented filling body with cement as the cementitious material has low strength and poor slurry fluidity, resulting in a large amount of filling cementitious material and high filling mining costs. At the same time, the viscosity of the fu...

AI Technical Summary

Problems solved by technology

Due to the poor gelation and volume instability caused by the harmful mineral components in phosphogypsum, the current utilization rate of phosphogypsum is less than 5%, and most of the phosphogypsum is stacked.

[0008] To sum up, the current method to improve the filling stope roofing rate involves many types of filling materials, complex preparation processes, and manual intervention with supporting excavation engineering.

It not only increases the cost of filling mining, but also complicates the mining and filling process and procedures, thereby prolonging the mining and filling cycle, thereby reducing the production capacity of filling mining, thereby reducing the economic benefits of filling mining

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