Bayer process red mud and gangue porous sintered brick and production method thereof

Abstract

The invention discloses a Bayer process red mud and gangue porous sintered brick and a production method thereof. The porous sintered brick is prepared from the following raw materials: 60 to 75 parts of Bayer process red mud; 25 to 35 parts of gangue; 2 to 6 parts of tailings or wastes in chemical plants; and 0.5 to 3 parts of pore-forming agent. The preparation method of the brick comprises the following steps: after dehydrating the Bayer process red mud, mixing and uniformly stirring the Bayer process red mud and other ground raw materials, aging for 1 to 3 days, and adding water to stir aged powder in a stirring machine so as to obtain mud; carrying out extrusion forming on the mud under the extrusion pressure of 1.5 to 2.5MPa by adopting a stiff-plastic process so as to obtain a semi-finished product which accords with the specified dimension and the specified shape; and drying a mold brick and sintering the mold brick in a tunnel kiln to obtain the Bayer process red mud and gangue porous sintered brick. The product reaches the national strength standard of the sintered bricks. In the technology, the total use amount of industrial wastes is close to 100 percent; a large number of farmlands are saved; land resources are effectively protected; and the Bayer process red mud and gangue porous sintered brick and the production method thereof accord with the national policies of saving energy and reducing emission and have obvious environmental benefits, social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid wastes, and in particular relates to a porous sintered brick produced from industrial waste residues such as red mud and coal gangue discharged during the production of alumina by using the Bayer process production method as raw materials. Background technique [0002] Since the reform and opening up, my country's construction industry has continued to develop at a high speed. Therefore, my country consumes about 750 billion pieces of fired bricks every year. If such a large number of bricks are all made of clay, a large amount of farmland will be destroyed. Therefore, the Chinese government strictly prohibits the production and use of clay solid sintered bricks, and encourages the use of various industrial solid wastes to prepare sintered bricks. Red mud is the waste residue produced after alumina is extracted from bauxite, and damming and stockpiling is a commonl...

AI Technical Summary

Problems solved by technology

Although the process is simple, the disadvantage is that it needs to provide more heat, which increases the cost consumption, and it is not a porous brick, which has a large specificity.

The patented product has the advantages of high compressive strength, low water absorption, complete freeze-thaw resistance, no frost phenomenon and good thermal insulation performance, but the main component is fly ash, less red mud consumption, and higher energy consumption