Technological method for producing inorganic fibers from red mud

Abstract

The invention discloses a technological method for producing inorganic fibers from red mud and belongs to the field of comprehensive utilization of the red mud. According to the technological method, a curing agent and an acidity coefficient modifier are added to the red mud, a mixture and coke are molten at the high temperature, element resources including Si, Ca, Fe, Al, Na and Mg in the red mud, the curing agent and the acidity coefficient modifier are sufficiently utilized, the red mud is taken as a main material for production of the inorganic fibers, the ratio of the dosage of the red mud can be higher than 70%, red mud pollution is effectively treated, the produced inorganic fibers reach the level of rock wool, and economic, social and environmental benefits are remarkable. The technology is simple, the production cost is low, and large-scale production of the red mud for comprehensive utilization can be realized.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of red mud, in particular to a process method for producing inorganic fibers by using red mud. Background technique [0002] Red mud is the residue produced after bauxite is extracted from alumina through the "Bayer method" or "sintering method". The amount of red mud produced is related to the production method and ore grade. Generally, 1-1.7 tons of slag will be produced for every ton of alumina produced. These slags are reddish brown because they are rich in iron oxide. They are called red mud and belong to Hazardous solid waste, the lower the grade of raw materials, the greater the amount of red mud produced. As the world's four largest alumina producers, China discharges tens of millions of tons of red mud every year. A large amount of red mud cannot be fully and effectively utilized. At present, the red mud treatment in the alumina plant is still piled up by building red mud dams. ...

AI Technical Summary

Problems solved by technology

Its technology needs to neutralize the red mud with acid, the process is complicated, and the production cost is high. Using acid as a neutralizing agent will produce harmful gases during the high-temperature melting process, which has a certain impact on the environment.

At the same time, the inorganic fibers produced can only barely meet the technical indicators of "mineral wool", but cannot meet the national technical standards of "rock wool", especially the indicator of "acidity coefficient"

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