Red mud autoclaved brick and preparation method thereof

Abstract

The invention relates to a kind of stream-pressed bricks by utilizing red mud as the raw material, the constituents of the raw material include (by weight percent): red mud 25-40%, coal ash 10-30%, aggregate 35-55%, carbide slag 8-14% and modified phosphogypsum 2-5%.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an autoclaved brick prepared from red mud. Background technique [0002] In the alumina production process, bauxite is treated with circulating mother liquor containing a large amount of free NaOH, so that the alumina in the ore is converted into a slurry containing sodium aluminate. After the slurry is melted out under high pressure, it enters sedimentation and separation. The solid phase is red mud. The main minerals of red mud are: aragonite and calcite, whose content is 60-65%, followed by opal, gibbsite, goethite; there are also a small amount of titanium minerals, siderite, trona, water glass, aluminum Sodium Acid and Caustic Soda. [0003] Generally, 1-1.3 tons of red mud is produced for every ton of alumina produced. With the development of the aluminum industry, according to incomplete statistics, the world discharges about 50 million tons of red mud every...

AI Technical Summary

Problems solved by technology

However, the use of red mud has problems such as low utilization rate and high utilization cost, so it cannot effectively use red mud in large quantities

Because a large amount of red mud has not been fully utilized, a large amount of land has been occupied for a long time, resulting in land alkalization, groundwater pollution, and endangering human health.

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