Bayer process red mud composite brick and producing method thereof

Abstract

The invention discloses bayer process red mud composite bricks and the production method thereof. The composite bricks are mixed and produced the following raw materials, bayer process red mud 20 -35 parts, fly ash 15-34 parts, carbide slag 5-15 parts, slag 30-40 parts, cement 5-12 parts and gypsum 0-5 parts. The preparation process of the composite bricks is that after the bayer process red mud is dewatered, mixing and stirring the bayer process red mud with other raw materials, controlling the moisture content of wet base in the range of 12%-20%, the mixture is shaped under the pressure of 15-40MPa, the shaped bricks are produced into products in steam with 0.1-1.3MPa keeping pressure for 5-8h. The product can reach the requirement of the strength grade of fly ash bricks reaching to 10 or more. The total amount of use of industrial waste residue of the technology nearly reaches 90%, the technology has the advantages of no sintering, low energy consumption, no emission of exhaust gas, meeting the country policy of energy saving and emission reduction, having distinctive effects on environmental benefit, social benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial waste residues, and in particular relates to a composite brick produced by using the Bayer process red mud of an alumina factory and other industrial waste residues as raw materials. Background technique [0002] As the country gradually strengthens the protection of land resources and the price of coal resources continues to be high, the past technology of using clay to sinter into bricks will be gradually eliminated, and will be replaced by non-sintered bricks that do not require sintering and whose main raw materials are industrial waste slag. The non-fired brick technology adopts high-pressure molding, and the curing method adopts autoclaved curing or natural curing, which is an environmental protection technology encouraged by the state. [0003] In recent years, my country's alumina production has continued to increase, and in 2006 it became the second largest prod...

AI Technical Summary

Problems solved by technology

The disadvantage is that the raw materials need to be digested and pretreated for 2-4 hours; the bricks are pre-cured in 0.8-1.2MPa steam for 12 hours, and then 0.8-1.2MPa high-pressure steam curing for 8 hours, the process is more cumbersome

[0012] Due to the different physical and chemical properties of the two red muds, the formula and process provided by the above patent documents are directly applied to the Bayer process red mud, and neither can obtain qualified products