Method for preparing mine filler by cementing solid wastes in iron and steel industry with heavy metal tailings

Abstract

The invention provides a method for preparing a mine filler by cementing solid wastes in the iron and steel industry withheavy metal tailings, which comprises the following steps of: S1, by using steel slag, desulfurized fly ash and slag as gel materials, adding an alkali activator and an activator into the gel materials, and uniformly stirring to prepare a cementing agent; S2, adding a dispersingagent, a binding agent and a heavy metal curing agent into the heavy metal tailings, and uniformly stirring; and S3, uniformly stirring and mixing the cementing agent in the S1 and the heavy metal tailings in the S2 according to a certain proportion to prepare the mine filler. Solid wastes in the iron and steel industry are cemented with heavy metal tailings to replace cement consolidated tailings to serve as a mine filling material, the mine filling cost is reduced, and the comprehensive utilization amount of steel slag, desulfurized fly ash and tailing bulk solid waste and the mechanical strength of a mine filling body are improved.

Description

technical field [0001] The invention relates to resource utilization of industrial solid waste in the iron and steel industry, in particular to a method for preparing mine filling by cementing heavy metal tailings with solid waste in the iron and steel industry. Background technique [0002] Steel slag is industrial waste slag produced in the steelmaking process of the iron and steel industry. Factors such as low gelling activity, poor grindability, and poor volume stability of steel slag limit the resource utilization of steel slag. In 2018, the output of steel slag in my country reached 120 million tons. The stockpiling capacity exceeds 1 billion tons, and the comprehensive utilization rate of steel slag is about 25%. [0003] Desulfurization ash is an industrial solid waste produced by semi-dry flue gas desulfurization technology in the iron and steel industry. The main component is calcium sulfite (CaSO 3 ), calcium sulfate (CaSO 4 ), calcium sulfate hemihydrate (CaSO ...

AI Technical Summary

Problems solved by technology

[0003] Desulfurization ash is an industrial solid waste produced by semi-dry flue gas desulfurization technology in the iron and steel industry. The main component is calcium sulfite (CaSO 3 ), calcium sulfate (CaSO 4 ), calcium sulfate hemihydrate (CaSO 4 0.5H 2 O) and ammonium salts, etc., CaSO 3 Easily oxidized to calcium sulfate (CaSO 4 ), due to the low comprehensive utilization rate of desulfurization ash due to its unstable properties, most iron and steel enterprises currently use concentrated accumulation to deal with desulfurization ash, occupying valuable land resources and causing serious environmental pollution

[0004] Tailings are raw ores that enter the concentrator and go through a series of processes such as crushing, grinding, and sorting. The remaining parts that cannot be used for production are discharged in the form of slurry. A large amount of tailings cannot be used as a resource and is accumulated in the tailings pond all year round. , the stockpiling takes up valuable land resources, and the heavy metals in the tailings permeate into the surrounding soil, causing serious ecological environmental pollution

[0005] At present, consolidating tailing sand as a mine filling material is the first choice to quickly and massively consume tailing sand. Cement is the first cement for mine filling, but the high price of cement increases the cost of mine filling materials, which limits the large-scale utilization of tailing sand in the field of mine filling. , and the heavy metal solidification / stabilization effect of cement is poor when cementing heavy metal tailings, resulting in low utilization of heavy metal tailings in the field of mine filling. Resource utilization is of great significance

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