Low-bleeding-rate pumpable phosphogypsum and yellow phosphorus slag filling paste and preparation method of paste

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

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AI Technical Summary

Benefits of technology

This patented technology describes methods used during manufacturing fillings made from calcium sulfite (CSA) plasters. These materials have lower rates at absorbing water compared to traditional hydraulic binders like Portland Cements. They are less expensive than other alternatives but they still cause problems such as reducing fluidity when mixed together due to their weak binding properties. To address these issues, this patents propose developing new ways to make them easier to mix properly without losing its effectiveness.

Problems solved by technology

This patents describes different ways to improve the efficiency and performance of producing filled concrete structures through the use of fillings made from specific types of calcium silicate clay called Caustic Acid Sulphoylite Clay ("CSA"). These compositions are mixed together at room temperature before being poured into molds where they hardens without causing issues like soil subsidence and loss of roadways. Additionally, these new techniques involve creating a stable liquid mixture containing both CASAHYZO 4-500 ppm hydrochloric acid solution and Phoslock® P 2223.

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