Method for preparing carbon-fixation filling paste from waste concrete

Abstract

The invention discloses a method for preparing a carbon-fixation filling paste from waste concrete. The method comprises the following steps: industrial waste gas is dedusted, and then is mixed with normal temperature air, a waste concrete and a gangue mixture is crushed in the obtained industrial exhaust gas atmosphere, and coarse aggregates, fine aggregates and fine powder obtained after screening and carbon dioxide in the industrial exhaust gas undergo a carbonization reaction in a carbon fixation chamber; and the carbon-fixation coarse aggregates, the carbon-fixation fine aggregates, a filling paste additive, cement, phase change material microcapsules and water are stirred and mixed to form a filling body mixture, and the industrial exhaust gas is continuously injected in the stirring, mixing and conveying process of the filling paste to make the filling paste and the carbon dioxide in the industrial exhaust gas undergo the carbonization reaction in order to obtain the carbon-fixation filling paste. The carbonization reaction of the waste concrete and carbon dioxide is fully used, so the damages of the waste concrete to the environment are reduced, and the emission of greenhouse gases is reduced; and hydration heat is fully used in the carbonization reaction, so the filling effect of the carbon-fixation filling paste is good.

Description

technical field [0001] The invention relates to a method for preparing a filling paste, in particular to a method for preparing a carbon-fixing filling paste by using waste concrete. Background technique [0002] Paste filling mining technology can not only release the "three-down" compressed coal well, improve the recovery rate of coal resources, but also fundamentally solve the problems of large-scale surface subsidence and damage to ground buildings, water resources, and land resources . Therefore, it is particularly urgent to vigorously promote the development of paste filling technology. Filling material is the core of the entire filling system. At present, the main filling material is coal gangue, but many mines do not have enough coal gangue as filling material. Therefore, it is very important to expand the range of material sources to promote the development of filling technology. According to the current situation, the amount of waste concrete in my country will ...

AI Technical Summary

Problems solved by technology

Current patent number: 201410178455.2, patent name: a Chinese patent for a method of using waste concrete to prepare coal mine filling paste, which uses waste concrete and coal gangue to make powder, fine aggregate and coarse aggregate, and cement, fine Filling paste can be obtained by mixing aggregate, coarse aggregate, ultrafine powder, regulator and water, but how to fix carbon dioxide in the preparation process has not been involved