Gob-side entry retaining roadside filling support material using modified industrial gypsum to solidify red mud and preparation method of gob-side entry retaining roadside filling support material

Abstract

The invention discloses a gob-side entry retaining roadside filling support material using modified industrial gypsum to solidify red mud, which is prepared from the following raw materials in parts by weight: 70-85 parts of red mud, 13-30 parts of modified industrial gypsum and 2-10 parts of compound additive. The manufacturing method of the gob-side entry retaining roadside filling support material comprises the following steps: scattering and crushing red mud to below 3mm for later use; premixing the compound additive, the modified industrial gypsum and the scattered and crushed red mud to obtain a solid mixture; mixing and stirring water and the solid mixture strongly, and obtaining a filling paste slurry; and conveying the filling paste slurry to a filling bag for filling and curing to obtain the roadside filling support material. The prepared roadside filling support slurry is good in stability, good in fluidity and high in strength after being cured. According to the filling material, the defects that the filling construction difficulty of concrete is high, the filling cost of high water is high and the strength is low are overcome, the roadside filling and supporting cost of gob-side entry retaining mining of a mine is reduced, and harmless, large-scale and resource utilization of the two solid wastes of the red mud and the industrial gypsum is realized.

Description

technical field [0001] The invention relates to the technical field of mining support for gob-side entry retaining in mines, in particular to a gob-side entry retaining material and a preparation method for solidifying red mud with modified industrial gypsum. Background technique [0002] Red mud (Red mud or Bauxite residue) is a solid waste produced during the production of alumina from bauxite. my country's alumina industry is developing rapidly. In 2020, the domestic alumina output will reach 73.132 million tons, making it the world's largest alumina producer. While the alumina industry is developing, the discharge and storage of red mud are increasing year by year, and the increasing trend is particularly obvious in recent years. Usually, about 1.0-2.0 tons of red mud is produced for every ton of alumina produced. At present, the accumulated stock of red mud in China is about 500 million tons, and the estimated annual discharge is 90 million tons. The material composi...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a gobside retaining roadside filling support material and preparation method which uses modified industrial gypsum to solidify red mud, and aims to compound red mud and modified industrial gypsum into a new type of roadside filling The support material solves the problem of high cost of existing concrete filling materials and high-water filling materials, and can use industrial waste slag red mud and industrial gypsum to combine the reduction of mining costs with harmless, large-scale, and resourceful consumption of red The two solid wastes of mud and industrial gypsum are combined

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