Filling slurry for filling mining method and preparation method for filling slurry

Abstract

The invention discloses filling slurry for a filling mining method and a preparation method for the filling slurry. The filling slurry is prepared from the following materials: tailings, ultrafine powder, cement and debris, wherein the tailings are mill tailings at the concentration of about 20 percent, and are thickened into high-concentration tailings at the concentration of over 65 percent; the ultrafine powder is obtained by finely grinding phosphorous slag which is discharged as waste residue after yellow phosphorus is prepared by a hot method or phosphate ores are calcined by other methods until the fineness is equivalent to that of the cement, and the cement and the ultrafine powder are jointly taken as a cementitous material; and the debris is crushed into particles with the particle size of less than 2cm, and the tailings at the concentration of over 65 percent are conveyed to a filling slurry preparation station through a pipeline and are prepared into filling slurry at the concentration of equal to or more than 70 percent by using stirring equipment. The invention is characterized in that: the filling slurry has a remarkable social benefit; a series of problems about mining filling are solved; and more importantly, the national environmental protection requirements are met, and the secondary harm is avoided. The filling slurry is applicable to the filling mining method and is particularly applicable to middle and low grade phosphorus mines.

Description

technical field [0001] The present invention relates to a filling mining method, and further to a filling paddle for the filling mining method and a preparation method thereof. Background technique [0002] "Mining Handbook" printed for the seventh time in April 2010 by Metallurgical Industry Press {China Version Library CIP Data Hezi (2007) No. 147805, ISBN978-7-5024-0374-4} Volume 4 Second Chapter 10 details the filling mining method, its application fields and the filling materials used, etc. Its content does not involve non-metallic mines, especially phosphate mines, and more importantly, there is no part about filling with tailings in its content. Describe how the filling materials meet the national environmental protection standards and realize environmental protection filling. [0003] Chinese patent ZL200710077624.3 "Phosphogypsum cementation followed by filling mining method and its pulping process" discloses that the pulping process is to use phosphogypsum, fly as...

AI Technical Summary

Problems solved by technology

The invention can ensure the mine's full and stable production, improve the ore recovery rate, fully recycle the phosphate resources, and have remarkable economic benefits; it can also effectively protect the mine environment, solve geological disasters caused by open-field mining, and unsafe mine production. It poses a threat to surface industrial facilities, roads and houses, but its biggest shortcoming or shortcoming is that it directly uses phosphogypsum, an industrial waste residue that is extremely harmful to the environment, as the main filling material for underground filling, and its harm to the underground environmental water system bound to be huge

Secondly, the use of fully cemented filling will inevitably lead to an increase in filling costs, which is extremely unfavorable in terms of mining costs for the mining of ores in low- and medium-grade phosphate rock areas with poor ore quality