Method for preparing mine fill by utilizing Bayer process red mud

Abstract

Provided is a method for preparing mine fill by utilizing Bayer process red mud. The method belongs to the technical fields of construction materials and solid waste resource utilization. The technical scheme of the method for preparing the mine fill is that the Bayer process red mud, coal ash, lime and gypsum are adopted to serve as raw materials and are evenly mixed according to a certain weight percentage to form the mine fill. The method for preparing the mine fill by utilizing the Bayer process red mud has the advantages that due to the fact that after the Bayer process red mud is hydrated, large amount of ettringite is produced and has high strength in an early period, the ettringite has an function of micro-expansion without shrinkage, and a goaf of a mine can be filled. Compared with cement used for the fill, cost can be saved by more than 60%. The method for preparing the mine fill by utilizing the Bayer process red mud facilitates saving of land source, avoids causing severe pollution to peripheral water bodies, atmosphere and soil, and facilitates environment protection.

Description

technical field [0001] The invention relates to a method for making mine filling materials by using Bayer process red mud, and belongs to the technical field of resource utilization of building materials and solid waste. Background technique [0002] Red mud is the waste residue produced after extracting alumina from bauxite. Because it is mostly red, it is called red mud. The production of red mud strips in my country reaches tens of millions of tons, most of which are Bayer red mud. At present, dam building and stockpiling are the main treatment methods for red mud, and the treatment and disposal of red mud is an international problem. At present, a large amount of red mud associated with alumina production in my country is disposed of by land storage. Because red mud has high alkalinity and a large amount of production, traditional treatment methods not only occupy a large area of ​​farmland, but also cause serious pollution to surrounding water bodies, air, and soil. ...

AI Technical Summary

Problems solved by technology

Due to the high alkalinity and large amount of red mud produced, the traditional treatment method not only occupies a large area of ​​farmland, but also causes serious pollution to the surrounding water, air, and soil.

At present, cement is mostly used as filling material in the mined-out area of ​​mines, and the cost is relatively high