Method for producing high-performance haydite from red mud

Abstract

The invention discloses a method for producing high-performance haydite from red mud, which comprises the following steps: taking 40-70 parts by weight of Bayer-process red mud, 0-30 parts by weight of sintering-process red mud, 5-20 parts by weight of fly ash and 5-30 parts by weight of clay material on dry basis as raw materials; evenly mixing the raw materials with 5-20 parts by weight of water, and putting the mixture on a pelletization plate to carry out pelletization, thereby obtaining the haydite fresh pellets; sintering the haydite fresh pellets, of which the diameters are 0.5-20mm, in a rotary kiln or sintering machine at 1050-1200 DEG C for 15-60 minutes; and quenching the sintered haydite to obtain the high-performance haydite product, of which the density level is 600-900, the water absorptivity is lower than 12%, the cylindrical compressive strength is higher than 7.5MPa and the strength grade is higher than 50MPa. The invention can effectively and massively utilize red mud as the raw material to produce the high-performance haydite, has the advantages of simple manufacturing technique and high product quality, and changes wastes into valuable substances.

Description

technical field [0001] The invention relates to a method for producing high-performance ceramsite by using red mud, and belongs to the technical field of ceramsite building material production. Background technique [0002] Ceramsite is one of the fastest growing new building materials in my country in recent years. my country has become the world's largest producer of ceramsite. In 2000, the output was 3 million cubic meters. In 2004, it reached 5 million cubic meters, with an annual growth rate of 20%. It is expected to exceed 10 million cubic meters in 2010. Ceramsite is characterized by its low thermal conductivity, excellent thermal insulation performance, good sound absorption and sound insulation performance, high temperature resistance, anti-aging, acid and alkali resistance, environmental protection and energy saving, shock resistance, good durability, and high activity, microporous, A series of advantages such as large specific surface area and strong adsorption c...

AI Technical Summary

Problems solved by technology

At present, the production of ordinary ceramsite and high-performance ceramsite in the prior art mainly uses several raw materials such as clay raw materials, expanded perlite or argillaceous rock as raw materials. The existing methods for producing ordinary ceramsite and high-performance ceramsite There is a disadvantage that the solid waste produced by the alumina industry - red mud cannot be used as a raw material for production, and the production of ordinary ceramsite and high-performance ceramsite according to the existing method will consume a large amount of clay and expanded perlite or argillaceous rocks and other natural resources, which will not only cause certain damage to the environment, but also reduce the reserves of these non-renewable resources

Therefore, the existing methods of producing ordinary ceramsite and high-performance ceramsite are still not ideal.