Cement filling material for co-solidifying arsenic and preparation method thereof

Abstract

The invention discloses a mine cement filling material for co-solidifying arsenious hazardous wastes and a preparation method thereof, and belongs to the environment protection fields, such as the mine cement filling, solid waste resource utilization and the co-processing of the arsenious hazardous wastes. The preparation method comprises the following steps: milling the needed raw materials, such as mine slag, steel slag and desulfurization gypsum, with 0.01%-1% of the water content according to the dry basis weight percentage of 45%-50% of the mine slag, 10%-30% of the steel slag and 10-15% of the desulfurization gypsum, milling independently or milling by mixed powder until the specific surface area is 200-600 m<2> / Kg, adding 10%-35% of calcium hydroxide, uniformly mixing to obtain a cementing agent, and drying the arsenious hazardous wastes until the water content is 0.01%-1%, according to the weight proportion of the cementing agent / aggregate material of 1 / 4-1 / 8, the weight proportion of the arsenious hazardous wastes / (cementing agent + aggregate material) of 1 / 1000-1 / 100, adding 0%-1% of a water reducer, until the mass fraction of slurry is 65%-86%, and uniformly stirring to obtain the qualified mine cement filling material. The preparation method has the characteristics of simple and easy operation, low energy consumption, low cost, no new solid waste generation, small environmental pollution, and environmental protection.

Description

Technical field [0001] The invention relates to the technical field of cemented filling of mines, resource utilization of solid wastes and co-processing of arsenic-containing hazardous wastes, in particular to a cemented filler for mines used for coordinated solidification of arsenic-containing hazardous wastes and a preparation method thereof. Background technique [0002] The current industrial system is actually a process of extracting resources and discharging waste. The tailings, waste rock, coal gangue, fly ash and smelting slag produced during the development and utilization of domestic mineral resources have become the largest industrial solid wastes, accounting for 85% of the total national solid waste emissions. [0003] Steel slag is a solid slag body composed of slag-making materials, smelting reactants, corroded-off furnace bodies and repairing materials, impurities brought by metal furnace charges, and slag-making materials specially added to adjust the properties of ...

AI Technical Summary

Problems solved by technology

However, the mining process and filling process are relatively complicated, and mining and filling interact with each other. If the mechanization of the mining operation cannot be properly resolved, the production efficiency and capacity will be low. higher

[0010] Ordinary Portland cement is the most commonly used cement, but its production process itself has the characteristics of high energy consumption and serious pollution

In recent years, a large number of new cementitious materials that have appeared are basically improved on the basis of ordinary Portland cement or slag cement, that is, slag, fly ash, red mud, etc. with a high heat history are used to replace part of the cement clinker , but due to the limitation of raw materials, the low amount of replaced clinker, and the unsatisfactory cementation results, its popularization and application are restricted.

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