Method for preparing coal mine paste filling aggregate by using urban building waste as raw material

Abstract

The invention discloses a method for preparing coal mine paste filling aggregates by using urban building waste as a raw material. The method comprises the following steps: recycling building waste, effectively classifying the recycled building waste, and removing sundries in the building waste by using a grizzly screen or manually; screening with a powerful vibrating screen, so that the building waste with grain size less than 40 mm is directly fed into an efficient fine crushing machine, the building waste with grain size larger than 40 mm is fed into a jaw crusher for crushing, and aggregates crushed into the grain size less than 40 mm are fed into the efficient fine crushing machine; screening the obtained aggregate after the aggregate is crushed by the efficient fine crushing machine, so that aggregates with grain size between 5-25 mm as well as grain size less than 5 mm are obtained; collecting regenerated micro powder with gain size less than 0.15 mm by using a dust exhaust apparatus during crushing and screening. According to the invention, the building waste can be introduced into a coal mine paste filling mining technology, so that the range of the source of paste filling material can be expanded, and the urban building waste is treated effectively.

Description

technical field [0001] The invention relates to a method for preparing coal mine paste filling aggregate by using urban construction waste as a raw material, and belongs to the field of coal mine paste filling and mining. Background technique [0002] Paste filling technology has been widely implemented and applied in coal mines in recent years. The method is simple, does not require complex drainage equipment, and has high filling density, which can achieve a better effect of controlling rock formation movement. However, judging from the existing coal mines that implement paste filling, the filling aggregates all come from gangue and other coal mine solid waste, and the source is single. If new alternative materials cannot be found in time, their normal production will be affected, and for those gangue output Few or even no coal mines have to abandon the paste backfill technology when they carry out backfill mining. [0003] At present, the total amount of urban constructi...

AI Technical Summary

Problems solved by technology

In recent years, research on construction waste recycling has been carried out one after another and a series of results have been achieved, but the field of recycling is limited to construction, building materials production, etc., with high quality requirements and limited usage

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