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

A composite desiliconizing agent, sodium aluminosilicate technology, applied in the purification of aluminate/alumina/aluminum hydroxide, preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of high viscosity and production Process conditions are not easy to control and other problems, to achieve the effect of reducing energy consumption and simple production process

Inactive Publication Date: 2010-09-29
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepared as above k =1.3-1.5, the sodium aluminosilicate solution containing alumina concentration 150-160g / L, take 87.5mL (depending on the size of the reactor) and add it to the reactor. Weigh calcium oxide powder and calcium sulfate (calcium oxide:calcium sulfate=3:1-4:1) respectively, mix them evenly and add them to the reaction kettle. The temperature is set between 90-100°C, the stirring speed is 867-1300r / min, and the desiliconization time is 90-120min. After cooling, take the supernatant and filter and then use the above analysis method to measure the concentration of alumina and silicon dioxide. After desiliconization, the silicon content index of the solution reaches above 9000.

Embodiment 2

[0025] Prepared in the same way as a k =1.3-1.5, sodium aluminosilicate solution containing alumina concentration 180-190g / L, take 87.5mL and add it to the reaction kettle. Weigh calcium oxide powder and calcium sulfate (calcium oxide:calcium sulfate=3:1-4:1) respectively, mix them evenly and add them to the reaction kettle. The temperature is set between 90-100°C, the stirring speed is 867-1300r / min, and the desiliconization time is 90-120min. After cooling, take the supernatant and filter and then use the above analysis method to measure the alumina concentration as the silica concentration. After desiliconization, the silicon content index of the solution reaches more than 7000.

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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 concentrationunder 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/47
Inventor 王雅静陈同军宁志高
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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