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Method for removing silicon element in liquid salt by utilizing boiler tail gas

A liquid salt and silicon element technology, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of ineffective silicon removal, secondary pollution of impurity ions, and removal rate Low cost and other problems, to achieve the effect of reducing the operating cost of filtration, low operating cost, and less consumption of raw and auxiliary materials

Active Publication Date: 2020-05-01
CHINASALT JINTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simultaneously solve the problem that the silicon removal effect of the existing silicon removal method is not obvious, the removal rate is low, and the secondary pollution of impurity ions is caused by the large amount of chemical dosage. Good way to remove silicon

Method used

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  • Method for removing silicon element in liquid salt by utilizing boiler tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Calcium 0.5g / L, magnesium 1.0g / L, silicon element (as SiO 2 20mg / L of liquid salt, add mass concentration of 30% liquid caustic soda, keep the caustic soda concentration stable at 0.1g / L, then pass into the power plant boiler tail gas for 1h, keep the concentration of sodium carbonate at 0.2g / L, adjust the pH of the liquid salt The value is 10.2, and then according to the mass ratio of 30:1, add chitosan and sodium polyacrylate coagulant 5mg / L, mix for 10min and filter through membrane to obtain liquid salt with silicon element removed.

Embodiment 2

[0028] Contains calcium 2g / L, magnesium 1g / L, silicon element (as SiO 2 30mg / L of liquid salt, add mass concentration of 30% liquid caustic soda, keep the concentration of caustic soda stable at 0.3g / L respectively, then pass into power plant boiler tail gas for 3h, keep the concentration of sodium carbonate at 0.3g / L, adjust the liquid salt The pH value is 10.8, and according to the mass ratio of 50:1, add chitosan and sodium polyacrylate coagulant 15 mg / L, mix for 30 minutes, and filter through membrane to obtain liquid salt with silicon element removed.

Embodiment 3

[0030] Calcium 1.5g / L, magnesium 0.5g / L, silicon element (as SiO 2 25mg / L of liquid salt, adding liquid caustic soda with a mass concentration of 30%, keeping the concentration of caustic soda stable at 0.1g / L, and then feeding into the power plant boiler tail gas for 2h, keeping the concentration of sodium carbonate at 0.2g / L, adjusting the liquid The pH value of the salt is 10.2, and then according to the mass ratio of 40:1, add chitosan and sodium polyacrylate coagulant 5mg / L, mix for 10min, and filter through membrane to obtain liquid salt with silicon element removed.

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Abstract

The invention belongs to the field of inorganic chemical processes, and particularly relates to a method for removing a silicon element in a liquid salt by utilizing boiler tail gas. The liquid salt contains 0.5-2 g / L of calcium, 1.0 g / L or less of magnesium and 20-30 mg / L of silicon element (in terms of SiO2). The method for removing the silicon element in the liquid salt comprises the followingsteps of: adding 30% of liquid caustic soda; and then introducing flue tail gas from a boiler of a power plant, adjusting the pH value of the liquid salt to be 10.2-10.8, respectively stabilizing theconcentrations of caustic soda and sodium carbonate at 0.1-0.3 g / L and 0.2-0.3 g / L, adding a polymer coagulant with a concentration of 5-15 mg / L, carrying out mixing for 10-30 minutes, and then conducting filtering by a membrane. Thus, the silicon element in the obtained filtrate liquid salt is reduced from 20-30 mg / L to 1.0 mg / L or below. The method has the advantages of short process flow, simple operation and process equipment, thorough silicon removal and the like, and has the advantages of low operation cost, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the field of inorganic chemical technology, and in particular relates to a method for removing silicon element in liquid salt by using boiler tail gas. Background technique [0002] Since the liquid salt contains 20-30 mg / L silicon, if the silicon is not removed in the subsequent evaporative crystallization process of the salt industry and the pre-purification pretreatment of the liquid salt, silicate scaling will be formed in the evaporative crystallization equipment risk, affecting the heat transfer effect of evaporation and crystallization, resulting in increased energy consumption for salt production. [0003] Also in the chlor-alkali industry, especially in the ionic membrane alkali production process, the content of silicon in the liquid salt is too high, which directly affects the electrolysis efficiency of the ionic membrane and causes the instability of the cell voltage. Therefore, the ionic membrane used in the chlor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/60C02F101/10
CPCC02F9/00C02F1/66C02F1/5236C02F1/56C02F1/44C02F2101/10C02F1/60
Inventor 李伟戴秋霞陈留平张云云李娜刘凯朱旭初
Owner CHINASALT JINTAN