Method for preparing sintering-expanded haydite by taking red mud of Bayer process as main raw material

Abstract

The invention discloses a method for preparing a sintering-expanded haydite by taking red mud of Bayer process as a main raw material, comprising the following steps of by taking the red mud of Bayer process, fly ash, wasted glass, starch, carbon powder and sodium hexametaphosphate as raw materials, respectively grinding the red mud of Bayer process, the fly ash and the wasted glass by a sieve of 160 meshes; proportioning and uniformly mixing the sieved raw materials by the following mass ratio: (50-60):(20-25):(15-20):2:2;1 for Bayer process, fly ash, wasted glass, starch, carbon powder and sodium hexametaphosphate respectively; adding the water of 5-10% by mass in the raw material, mixing the mixture for 5-10min, decaying the mixture for 20-30min and forming balls; baking the formed balls in an oven for 2-5h at the temperature of 105 DEG C; drying the balls and preheating the balls in a muffle for 10-30min at the temperature of 600 DEG C; after preheating, quickly moving and baking the balls in a high-temperature Si-Mo furnace for 10-30min at the temperature of 1100-1200 DEG C; and after finishing baking, opening the furnace door, taking out the balls and forcibly cooling the balls. The sintering-expanded haydite prepared by the method has fine vitrification degree on the external surface and uniform internal aperture and takes closed holes as main ones.

Description

technical field [0001] The invention relates to a method for preparing ceramsite with swelling performance as light aggregate by using Bayer process red mud (low-silicon and high-iron) as the main raw material. Background technique [0002] Ceramsite is one of the fastest growing new building materials in my country in recent years. In 1995, the annual output of ceramsite was only 2 million cubic meters, which reached 3 million cubic meters in 2000, and exceeded 5 million cubic meters in 2004, with an annual growth rate of 20%. It is expected to exceed 10 million cubic meters in 2010. Intumescent ceramsite is widely used in the construction field due to its low thermal conductivity, excellent thermal insulation performance, good sound absorption and sound insulation performance, high temperature resistance, anti-aging, acid and alkali resistance, no radioactivity, earthquake resistance, and good durability. . [0003] With the development of ceramsite, behind its heating t...

AI Technical Summary

Problems solved by technology

Compared with the high calcium and low alkali characteristics of sintered red mud (in general, SiO 2 19-26%, Fe 2 o 3 3-11%, Na 2 O1-4%, Al 2 o 3 4-10%, CaO 40-47%), Bayer process red mud has the characteristics of high iron, high alkali and low silicon (in general, Fe 2 o 3 25-40%, SiO 2 10-24%Na 2 O 3-10% Al 2 o 3 18-34%), Bayer red mud is more difficult to develop as a traditional building material, and the degree of development and utilization is also low

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