Deep desilication method for adding composite desiliconization agent to middle and high concentration sodium aluminosilicate solution

Abstract

A composite desiliconization agent is added in sodium aluminosilicate solution with medium and high concentration for deep desiliconization, the invention relates to a chemical process method for carrying out the desiliconization of the sodium aluminosilicate solution with medium and high concentration by adopting the composite desiliconization agent under atmospheric pressure, the silicon content index of the solution after the desiliconization can be more than 7000, and the desiliconization method comprises the following steps: composition containing the sodium aluminosilicate solution is prepared, 80-90ml of the solution is taken and put in a reaction kettle, a calcium oxide and calcium sulfate composite desiliconization agent is added, the reaction kettle is put in a heat collection type constant temperature heating magnetic stirrer, supernatant liquor is taken after the solution is cooled, the concentration of Al2O3 is measured by using the complexometric titration, and the content of SiO2 is measured by using a spectrophotometer. The chemical process method is applicable to the secondary desiliconization of the sodium aluminosilicate solution with medium and high concentration. The economic benefits of using the sodium aluminosilicate solution with medium and high concentration are much higher than those of using the sodium aluminosilicate solution with low concentration under the situation of the same energy consumption, thereby being beneficial to reducing the energy consumption and promoting the sustainable development of the production of aluminum oxide.

Description

technical field [0001] The invention relates to a chemical process method, in particular to a method for deep desiliconization by adding a compound desilication agent to a medium-high concentration sodium aluminosilicate solution, so as to desilicate the medium sodium aluminate solution in two stages. Background technique [0002] my country's alumina production mainly adopts the sintering method, and the product quality of the sintering method is low. The main reason for the low quality of the sintering method alumina product is the Al(OH) produced by carbon. 3 Medium SiO 2 High content, the harm caused by silicon-containing minerals in production is: the formation of hydrous sodium aluminosilicate, resulting in Na 2 O and Al 2 o 3 The loss of sodium aluminosilicate in the production equipment and pipelines, especially on the surface wall of the heat exchanger, which reduces the heat transfer coefficient and increases energy consumption and cleaning workload; sodium alum...

AI Technical Summary

Problems solved by technology

In addition, most of the domestic and foreign studies on the deep desilication of sodium aluminate solutions are aimed at low-concentration sodium aluminate solutions, because the silicon content index after desiliconization of medium and high-concentration sodium aluminate solutions is not very high, and because of its high viscosity, the desilication The production process conditions in the silicon process are not easy to control