Baking-free brick prepared from red mud

Abstract

The invention discloses a baking-free brick prepared from red mud. Bayer process red mud is high in alkali content, and the problem of efflorescence can be easily caused during the production of a building material. A geopolymer synthesis technology is used for converting alkali in the red mud into an activator in an activation way, so that problems caused by the alkali during the utilization of the red mud are solved. The baking-free brick is mainly prepared from the following raw materials in parts by weight: 3 to 8 parts of water glass, 15 to 20 parts of active initiator, 70 to 80 parts of red mud and 0.5 to 1 part of micro silicon powder. The baking-free brick is prepared by the following steps of sequentially adding the red mud, the active initiator, the water glass and the micro silicon powder into a forced mixer, performing extrusion forming by using a brick making machine after uniform mixing, standing a brick blank for 1 to 2 hours under natural conditions to endow certain hardness to the brick blank, feeding the brick blank to an autoclave, and performing autoclaved curing for 2 to 4 hours under pressure of 0.8 to 1.2MPa to obtain a finished product. The baking-free brick prepared from red mud is low in cost, stable in product performance, strong in compressive strength and high in freezing and thawing cycle resistance, a production process is simple, the production site is small, and efflorescence after building is avoided.

Description

technical field [0001] The invention relates to a burn-free brick, in particular to a burn-free brick prepared from red mud, and belongs to the technical field of building materials. Background technique [0002] Red mud is the polluting waste discharged from the aluminum industry when it extracts alumina. The composition of red mud is complex, containing a large amount of fluoride and alkaline substances. If it is allowed to be piled up randomly, it will cause serious pollution to the environment. However, the annual discharge of red mud in my country is as high as tens of millions of tons. A large amount of red mud has already caused serious damage to production and life. influenced in many ways. At present, the processing methods of red mud mainly include the production of cement, the manufacture of wall blocks, the manufacture of lightweight aggregate concrete and as road subgrade materials. However, due to the large content of red mud in our country, high water content...

AI Technical Summary

Problems solved by technology

However, due to the large content of red mud in my country, high moisture content, and strong alkalinity, the utilization rate of red mud is low, or its use is restricted.