Red mud recycling method

Abstract

The invention discloses a method for recycling red mud to pulp the red mud. The method is characterized in that a reducing agent is added into the red mud, iron-containing particles in the red mud are reduced into magnetite particles, and then the magnetite particles are subjected to magnetic separation to obtain an iron-containing product A; and then the red mud subjected to the magnetic separation is used to prepare a baked brick product B. The applicant summarizes a set of method for preparing the baked brick, wherein a brick body prepared by the red mud is put into a mixed liquor of sodium silicate solution and barium sulfate, and then is blown to be dry by carbon dioxide, then a layer of barium sulfate protection film is covered on the surface of the brick body to shield the radioactivity. According to the method for recycling the red mud, the construction wastes being waste materials are added as aggregate, so that the strength of the brick body is improved, the fusion points of refractory materials can be reduced by adding a little fluoride salt, and various construction wastes and the red mud can be sintered together at a lower temperature.

Description

technical field [0001] The invention relates to a method for recycling red mud and belongs to the technical field of red mud recycling. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. China discharges red mud up to millions of tons every year. Due to the complex composition of red mud, it is not easy to separate, and the red mud in some areas is also radioactive, so the red mud is usually piled up in a special red mud field, which not only requires a certain amount of infrastructure costs, but also takes up a lot of land, and the harmful substances in it It seeps into the ground or water, seriously pollutes the environment, and causes many available components in the red mud to be unreasonably utilized, resulting in secondary waste of resources, which seriously hinders the sustainable development of the...

AI Technical Summary

Problems solved by technology

Due to the complex composition of red mud, it is not easy to separate, and the red mud in some areas is also radioactive, so the red mud is usually piled up in a special red mud field, which not only requires a certain amount of infrastructure costs, but also takes up a lot of land, and the harmful substances in it It seeps into the ground or water, seriously pollutes the environment, and makes many available components in red mud not be used rationally, resulting in secondary waste of resources, which seriously hinders the sustainable development of the aluminum industry.