Method for producing heat insulating material by using red mud

Abstract

The invention discloses a method for producing a heat insulating material by using red mud. The method comprises the steps of mixing the red mud with sodium hydroxide, then, heating the mixture in a crucible, then, cooling the crucible to room temperature, taking out the crucible, putting the crucible in boiling water, carrying out stirring, then, carrying out standing for layering, drying an upper-layer suspended substance, adding borax, quartz sand and limestone into the suspended substance, carrying out heated melting, then, carrying out cooling, and carrying out levigation, thereby obtaining the heat insulating material. According to the method, the heat insulating material is prepared from the red mud and additional liquid, which are produced from bauxite production and serve as raw materials, the red mud is recycled, and the utilization ratio of the red mud is increased. The yield and hazard of the red mud are reduced to the maximum, and multi-channel and large-quantity resource-converting is achieved. The method is simple and feasible and has no need of relatively large fund and equipment investment, and problems in environmental pollution caused by the red mud and recycling of waste residues are excellently solved.

Description

technical field [0001] The invention relates to a method for recycling red mud, in particular to a method for using red mud to produce thermal insulation materials. Background technique [0002] Red mud, also known as red mud, is the polluting waste discharged from the aluminum industry when extracting alumina. Generally, for every ton of alumina produced, 1 to 2 tons of red mud are incidentally produced. As the fourth largest producer of alumina in the world, China discharges millions of tons of red mud every year. A large amount of red mud cannot be fully and effectively utilized, and can only be stacked in a large area of ​​storage yard, which occupies a large amount of land and causes serious pollution to the environment. The red mud produced in the world is about 70 million tons every year, and the red mud produced in my country is more than 30 million tons every year. The production of a large amount of red mud has caused direct and indirect impacts on human producti...

AI Technical Summary

Problems solved by technology

It is simple and feasible, does not require large capital and equipment investment, and solves the pollution of red mud to the environment and the problems of waste residue recycling and utilization.