Decomposition crystallization aid for producing aluminum oxide

Abstract

The invention relates to the technical field of production of aluminum oxide and specifically discloses a decomposition crystallization aid for producing aluminum oxide. The decomposition crystallization aid is composed of a component I, a component II and a component III, wherein the component I is selected from any one or several of methanol, ethanol, propanol, glycerol, polyethylene glycol, polypropylene glycol and polyvinyl alcohol; the component II is selected from any one or several of sodium stearate, sodium oleate and sodium humate; and the component III is selected from any one or several of diethanol amine, triethanolamine and polyacrylamide. The decomposition crystallization aid provided by the invention has good water solubility and alkali solubility, and is good in dispersionperformance in a sodium aluminate solution and low in usage amount. It is proved, by a test, that the decomposition crystallization aid involved in the invention is applied to decomposition of the sodium aluminate solution in production of the aluminum oxide and is capable of improving the decomposition rate of the sodium aluminate solution; the particle size of decomposed products is obviously increased; the roasted aluminum oxide is high in strength; and the problems that the particle size is increased and the decomposition rate is increased in a decomposition process of the sodium aluminatesolution can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a decomposition and crystallization aid for alumina production. Background technique [0002] Alumina plants in my country use diaspore as raw material to produce sandy alumina with a high concentration of sodium aluminate solution using the Bayer process. Among them, the decomposition of sodium aluminate solution seed crystals is one of the main processes in the production of alumina by the Bayer process, and it is also a key process for realizing sandy alumina. At present, it is generally believed that there are many factors that affect the decomposition process. The influence of these factors is multifaceted and complex, and varies with different conditions. Therefore, the conditions for controlling the decomposition process have a great impact on the sandy alumina output rate and product quality. big impact. The improvement of quality, production and efficiency h...

AI Technical Summary

Problems solved by technology

However, these crystallization aids currently used are all oily organic substances or emulsified substances, and their water solubility or alkali solubility is not very good, the dispersion performance in the crystal system is not good, and the effect of particle size improvement and decomposition rate is not ideal.

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