A low bleeding rate pumpable phosphogypsum and yellow phosphorus slag filling paste and its preparation method

Abstract

The invention relates to a low-bleeding-rate pumpable phosphogypsum and yellow phosphorus slag filling paste and a preparation method of the paste. The paste is prepared by adding a certain percentage of yellow phosphorus slag as a cementing material into industrial waste residue phosphogypsum as a filling aggregate, calculating the required amount of water according to the target concentration on the basis that the natural moisture content of the phosphogypsum is determined, adding water and stirring. The filling paste has the advantages of precise concentration control, relatively low bleeding rate, relatively good fluidity, certain early strength and relatively good middle-term strength and long-term strength, and is used for the paste filling of phosphorite underground mined-out areas; the bleeding rate of slurry for phosphogypsum underground cementing filling is reduced, cost of underground drainage and filling is lowered and the pollution to the mine water environment is reduced. According to the invention, the industrial waste residue phosphogypsum and yellow phosphorus slag can be fully and effectively utilized, requirements on filling operation of phosphorus resource mining are met, the production capacity of a mine is enlarged, economic benefits are increased, the ground accumulation of industrial waste residue is reduced, the occupancy rate of land is lowered and the secondary pollution of filling wastewater to the environment can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of mining engineering, and relates to a method for preparing paste filling materials by using industrial double waste phosphogypsum and yellow phosphorus slag. technical background [0002] The use of industrial waste phosphogypsum for cemented filling mining is an important innovation in the mining of phosphate rock resources in my country in recent years. It has achieved significant economic benefits, reduced ground pressure hazards in goafs, and controlled environmental damage such as surface deformation in mining areas. For example, Guizhou Kailin (Group) Co., Ltd. has jointly tackled key problems with Central South University to conduct research on phosphogypsum cemented filling mining. The mass ratio of filling materials is cement: fly ash: phosphogypsum = 1:1:6~8 for mixing , and add 1.3 to 2.5% of the total mass of the above three materials as an additive sodium sulfate, and then adjust it with water to form a...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low bleeding rate pumpable phosphogypsum and yellow phosphorus slag filling paste and its preparation method, which can effectively solve the difficult problem of underground drainage of phosphogypsum cemented filling and may even pollute the mine water environment, and make full and effective use of phosphorus Gypsum and yellow phosphorus slag, the prepared filling paste meets the strength requirements of phosphogypsum filling operation pipeline transportation and stope filling body in phosphorus resource mining mines

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