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

Abstract

The invention provides a method for preparing mine filling by cementing heavy metal tailings with solid waste in the iron and steel industry. S2, add dispersant, binder and heavy metal curing agent to the heavy metal tailings and stir evenly; S3, stir and mix the cementation agent of S1 and the heavy metal tailings of S2 in a certain proportion to make a uniform preparation into mine fillings. The invention utilizes solid waste from the iron and steel industry to cement heavy metal tailings, replaces cement-solidified tailings as mine filling materials, reduces mine filling costs, improves the comprehensive utilization of steel slag, desulfurization ash, tailings bulk solid waste and the mechanical strength of mine filling bodies.

Description

Method for preparing mine filling by cementing heavy metal tailings with solid waste in iron and steel industry technical field The present invention relates to the resource utilization of industrial solid waste in the iron and steel industry, in particular to the cementation of the solid waste in the iron and steel industry Method for preparing mine filling from heavy metal tailings. Background technique Steel slag is the industrial waste slag produced in the steelmaking process of the iron and steel industry, and the steel slag is poor in grindability due to low gelling activity, Factors such as poor accumulation stability limit the resource utilization of steel slag. In 2018, my country's steel slag output reached 120 million tons. The stock exceeds 1 billion tons, and the comprehensive utilization rate of steel slag is about 25%. Desulfurized ash is a kind of industrial solid waste that iron and steel industry adopts semi-dry flue gas desulfurization technology t...

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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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