Method for preparing mine cemented filling material by using labor/mining industry solid waste mineralized CO2

Abstract

The invention provides a method for preparing a mine cemented filling material by mineralizing CO2 from labor / mining industry solid waste. The method comprises the following steps: grinding the labor / mining industry solid waste, and uniformly mixing the ground labor / mining industry solid waste with ammonium nitrate; placing the mixed raw material in a reactor for molten salt activation, collecting ammonia gas generated in the activation process, and converting Ca, Mg and Al in the activated raw material into corresponding metal nitrate; the metal nitrate activated mixture is subjected to water leaching treatment, and water leaching residues with the main component being SiO2 and water leaching liquid rich in Ca < 2 + >, Mg < 2 + > and Al < 3 + > are obtained through filtering; introducing the collected ammonia gas, the obtained water immersion liquid and CO2 prepared in advance into a reaction container to carry out carbonation reaction, and filtering to obtain filtrate containing ammonium nitrate and mineralized slag with main phases of CaCO3, MgCO3 and Al2 (CO3) 3; mixing the mineralized slag with cement and gypsum to prepare a cementing material; and mixing and stirring the cementing material, water and full tailings to prepare the cemented filling material. According to the method, CO2 mineralization sequestration and geological sequestration technologies are organically fused, and upgrading and transformation of metal mining under the dual-carbon strategy are achieved.

Description

technical field [0001] The invention relates to the technical field of mine filling materials and environmental protection, in particular to a kind of industrial / mining solid waste mineralization CO 2 A method of preparing mine cemented fill material. Background technique [0002] The traditional extensive mining method has provided a strong boost to my country's rapid economic growth, but at the same time it has also brought about problems such as the subsidence of underground mined-out areas and the accumulation of tailings on the ground. If it is not disposed of in time, it will cause large-scale environmental pollution and geological disasters, thereby threatening the safety of people's lives and property. The filling mining method has become the main technical means to realize green, safe and efficient mining in my country's metal mines. It has developed rapidly in recent years and has developed into a situation where various forms coexist. However, with the implementa...

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Problems solved by technology

[0002]The traditional extensive mining method has provided a strong boost to my country's rapid economic growth, but at the same time it has also brought about subsidence of underground gobs and accumulation of tailings on the ground, etc. If the problem is not dealt with in time, it will cause large-scale environmental pollution and geological disasters, which will threaten people's lives and property safety.

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