Paste combined filling method utilizing solid wastes of mine

Abstract

The invention relates to a paste combined filling method utilizing solid wastes of a mine. The method comprises the following steps of: constructing a filling retaining wall at the inlet of an underground worked-out section, and filling waste stones in which target metal is not contained or the content of the target metal is less than a boundary level, wherein the lumpiness is 0 to 400 millimeters, the loose static angle is 40 to 45 degrees, and the filling volume rate of the waste stones is 10 to 45 percent; then mixing 6.25 to 21.25 weight percent of gelatinizing agent, 53.75 to 78.75 weight percent of filling aggregates and 15 to 25 weight percent of water into a stirrer so as to prepare a paste cement material with the weight concentration of 75 to 85 percent; and conveying the paste cement material to the worked-out section through pumping of a filling pipeline or self-flowing under the action of gravity along the filling pipe, wherein the paste cement material is penetrated into the gaps of the waste stones; and the solidified paste cement material and the waste stones form a combined filler. By the method, the utilization rate of beneficiation full tail sand, smelting water granulated slag and underground waste stones is up to 100 percent, so the tailings cannot enter the base, the waste stones cannot emerge from the groove and the smelting water granulated slag cannot be piled up; and the environment and safety problems due to stacking of the wastes on the earth surface are solved from the sources.

Description

technical field [0001] The invention belongs to the technical field of mine filling, and relates to a method for preparing high-concentration filling material from mine solid waste and performing combined filling with underground waste rock, which is suitable for comprehensive utilization of various solid wastes produced on the surface and underground. Background technique [0002] The development and utilization of metal minerals generally need to go through three major processes: mining, sorting, and smelting. Each process produces a large amount of solid waste, such as mining waste rock, beneficiation tailings, and smelting waste residue. These wastes not only occupy a large amount of land, but also pollute the environment. On the other hand, for underground mines, in order to improve the underground safety environment and increase the ore recovery rate, it is necessary to fill the goaf. Using a variety of wastes produced in mines as filling materials can greatly elimina...

AI Technical Summary

Problems solved by technology

Firstly, the particle size of the whole tailings is fine, and dehydration is difficult, resulting in low concentration of filling materials, poor coagulation performance and low strength of the whole tailings; secondly, the excavation waste rocks are large in size, difficult to realize pipeline transportation, and the utilization rate of waste rocks is low ; Third, the smelting waste slag is hard and hard to grind, and the crushing efficiency is low; Fourth, the unit consumption of cementing agent for full tailings cemented filling is large, and the filling cost is high