Three stages, two seeds technique of seed crystal decomposition

Abstract

This invention relates to a three-stage two-seed seed crystal decomposing process. The process comprises: passing the mother liquor through an agglomeration decomposer and a seed crystal growth decomposer in order, adding decomposing seed crystal into the seed crystal growth decomposer, then passing through a reinforced decomposer, adding fine seed crystal into the reinforced decomposer, sending the overflow liquid of the reinforced decomposer to a leaf filter to obtain decomposed mother liquor, recovering fine seed crystal from the leaf filter, returning to the reinforced decomposer, returning seed crystal from the reinforced decomposer to the agglomeration decomposer, and sending part of the mother liquor via the seed crystal growth decomposer to the reinforced decomposer for circulation. The process has such advantages as reasonable procedures, low energy consumption, low cost, easy control, high decomposition rate and high product quality.

Description

technical field

[0001] The invention relates to a three-stage two-seed decomposition process, which is used in the industrial production of alumina. Background technique

[0002] In the process of industrial alumina production, the seed separation process is the longest process in the production process due to the slow decomposition rate of sodium aluminate solution. The fundamental reason why a series of problems in the decomposition process of sodium aluminate solution are difficult to solve is that people lack essential understanding of the structural properties and decomposition mechanism of supersaturated sodium aluminate solution. In the alumina production system, the special stability of sodium aluminate solution is very different from that of general supersaturated inorganic salt solution. Although a large amount of experimental data has been accumulated after hundreds of years of research, due to the complexity of the structure and special behavior of sodium alumina...

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