Refining slag combined with high mud tailings solidification disposal and solid waste filling mining method

Abstract

The invention provides a mining method of refining slag in cooperation with solidification treatment of high mud tailings and solid waste filling. The method uses LF refining slag to replace clinker, and prepares metallurgical slag-based cementitious materials with desulfurized gypsum and blast furnace slag; for high mud tailings Carry out cement strength and slurry rheological tests of different cement-sand ratios and slurry concentrations, as well as cement expansion rate and leachate pH value tests; establish cement strength, expansion rate, slurry rheological parameters and cement leachate pH value The relationship between cement-sand ratio and slurry concentration; the cost of high-silt tailing sand is used as the optimization target, and the cement strength, expansion rate, slurry rheological parameters and pH value of leachate are used as constraints to establish and solve the high-silt tailing sand material slurry optimization model. This method explores a way for industrial solid waste recycling, reduction and harmless disposal, thereby improving the economic and environmental benefits of filling mining and promoting the popularization and application of filling mining technology.

Description

Technical field [0001] The present invention relates to the intersection of solid waste curing treatment and filling mining method, particularly refers to a refined residue co-intensity and high cemented sand curing treatment and a full solid waste filling mining method. Background technique [0002] my country's steel industry emissions a large number of slag and steel slag each year. High furnace slag (also known as water quenching slabs) is high, prone to metofit, as building materials admixture has been placed and high value applications. Not only is the utilization rate is close to 100%, but also in short supply in some parts of my country. Steel slag includes three kinds of converter slag, refinery and electric furnace. According to the current steelmaking level, the amount of steel slag is 10% to 15% of the yield of crude steel. According to the data released by the National Bureau of Statistics, the production of crude steel in my country is 1.053 billion t and the steel ...

AI Technical Summary

Problems solved by technology

Compared with converter steel slag, refining slag has higher alkalinity, lower activity, higher hardness, and contains more f-CaO and f-MgO. The problem of volume instability is more prominent, and there are more problems in the application of building materials. The problem is that there are not many comprehensive utilization technologies for refining slag resources at present, resulting in a lower utilization rate of refining slag (≤10%)

In 2020, the output of my country's refining slag (LFS) is about 15 million tons. Most steel companies store it in tailings ponds after cooling, or partly mix it with converter slag for paving roads or calcining cement. waste

At present, most mines use cement as the tailings gelling agent. The strength of the tailings cement is low, the amount of cementitious materials is large, and the cost of filling and mining is high. The treatment of fine mud discharged from tailings classification faces greater difficulties and problems

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