Method for preparing mine filling concrete from wet-ground steel slag pulp

Abstract

The invention discloses a method for preparing mine filling concrete from wet-ground steel slag pulp, and belongs to the technical field of energy-saving building materials. According to the method, awet grinding process and a filling material preparation process are connected into a system, and steel slag blocks are subjected to multi-stage crushing and dry magnetic separation to obtain steel slag tailings and steel slag iron fine powder; the feeding concentration of the wet grinding steel slag and the weight percentage of the steel slag pulp in the filling material are calculated accordingto the slurry concentration, the lime-sand ratio and the ratio of the tailings to the steel slag aggregate of the mine filling material; wet grinding is performed on the steel slag tailings accordingto the calculated feeding concentration, the water consumption of the filling slurry is completely replaced with the water consumption for wet grinding according to the calculated weight percentage ofthe steel slag pulp in the filling material, and mineral powder and an additive are respectively added into the steel slag pulp according to the weight percentage of the steel slag pulp in the filling material, the lime-sand ratio of the filling material and the proportion of the additive in the lime to prepare the steel slag fine aggregate based mine filling material. According to the invention,the method saves water resources, is green and environment-friendly, is safe and stable in product and high in performance, and provides a new way for large-scale utilization of steel slag.

Description

technical field [0001] The invention relates to the technical field of energy-saving building materials, in particular to a method for preparing mine filling concrete by using wet-ground steel slag slurry. Background technique [0002] The discharge of steel slag is about 10%-15% of the steel output. Our country produces about 100 million tons of steel slag every year, but the comprehensive utilization rate is only about 30%. With the continuous increase of my country's crude steel production, a large amount of waste steel slag is piled up or landfilled year by year, occupying a large amount of land, and metal ions are washed into the surface with rainwater, seriously polluting drinking water resources, and at the same time, the fine particle steel slag piled up is naturally weathered During the process, dust is formed to pollute the surrounding atmosphere, posing a severe test to the ecological environment and human health. [0003] Wet grinding steel slag technology has be...

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Problems solved by technology

[0009] Aiming at the above-mentioned existing preparation method, which consumes a lot of water, causes water pollution, has many production processes, high energy consumption, does not consider the stability of steel slag, and has potential safety hazards, the present invention designs a method for preparing mines using wet-grinding steel slag slurry. The method of filling concrete, the steel slag wet grinding process is combined with the filling and mixing process, the wet grinding water is used for filling slurry water, and the steel slag is used as fine aggregate, which has the advantages of large steel slag treatment capacity, stability and safety, high strength of filling body, and super production of by-products. Fine steel slag powder and additives, saving and cleaning water resources, making full use of the beneficial components of wet grinding steel slag pulp, high efficiency and environmental protection, etc.

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