Brine impurity removal method in sodium chlorate production technology

A production process, the technology of sodium chlorate, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of increasing cost, short washing cycle, and rapid rise of tank voltage and other problems, to achieve the effect of reducing production costs, improving production efficiency and saving power consumption

Active Publication Date: 2013-09-04
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor raw material refining equipment, generally only the chemical impurity removal process is used, and the calcium and magnesium content in the refined brine is high (5-10mg/L), so the t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the salt tank, dissolve 36kg of crude salt solid and 42g of solid barium chloride in 100L of water at 35°C to form a sodium chloride solution with a concentration of 360g / L. The sodium chloride solution is sent to the refining tank through the pipeline, where 0.06kg of sodium carbonate and sodium hydroxide (1:1 in molar ratio) are added to the sodium chloride solution to make the pH value of the solution reach 9. After the precipitation is complete, the resulting metal salt precipitate is separated by filtration. Add hydrochloric acid solution to the sodium chloride filtrate to adjust the pH value of the system to 8, and then the filtrate passes through a cation chelate exchange resin column with a column temperature of 35° C. at a rate of 2 L / min to further remove alkaline earth metal impurities.

[0039] The sodium chloride solution treated with ion exchange resin is then passed through a microfiltration membrane with a pore diameter of 50nm at 3L / min to remove som...

Embodiment 2

[0042] In the brine storage tank, add 1L of 12g / L barium chloride solution to 100L of brine containing 100g / L of sodium chloride, and after the reaction is complete, pass the brine through a microfilter with a pore diameter of 100nm to remove large particles The solid impurities are sent to the reverse osmosis membrane device for concentration. Working temperature: 20°C; cooling water temperature: 20°C; working pressure: 1MPa. When the sodium chloride content in the brine reaches 350g / L after being concentrated by the reverse osmosis membrane, the brine is sent to other impurity removal processes along the pipeline. When the flux of the reverse osmosis membrane decreases by 30% to 40%, the reverse osmosis membrane should be cleaned in time.

[0043] The concentrated brine is sent to the refining tank, where 0.02kg of sodium carbonate and sodium hydroxide are added (the molar ratio of sodium carbonate to sodium hydroxide is 1:1), and the pH value of the brine is adjusted to 10...

Embodiment 3

[0047] In the brine storage tank, add 1L of 18g / L barium chloride solution to 100L of seawater with a sodium chloride concentration of 150g / L. After the reaction is complete, pass the seawater through a microfilter with a pore diameter of 100nm to remove large particles. The solid impurities are sent to the reverse osmosis membrane device for concentration. Working temperature: 40°C; cooling water temperature: 10°C; working pressure: 2MPa. When the sodium chloride content in the brine reaches 340g / L after being concentrated by the reverse osmosis membrane, the brine is sent to other impurity removal processes along the pipeline.

[0048] The concentrated seawater is sent to the refining tank, where 0.03kg of sodium carbonate and sodium hydroxide are added (the molar ratio of sodium carbonate to sodium hydroxide is 1:1), and the pH value of the solution is adjusted to 12. After the precipitation is complete, the resulting alkaline earth metal salt precipitate is separated by f...

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PUM

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Abstract

The invention discloses a brine impurity removal method in a sodium chlorate production technology. When crude brine is taken as the raw material for producing sodium chlorate, the brine impurity removal method comprises three processes including chemical impurity removal, ion exchange and micro-filtration; and when brine or seawater is taken as the raw material for producing sodium chlorate, the brine impurity removal method comprises five processes including micro-filtration, reverse osmosis concentration, chemical impurity removal, ion exchange and micro-filtration. The content of total calcium and magnesium ion is reduced to lower than 0.5 mg/L in the brine processed by the brine impurity removal method, so that corrosion of an electrolysis bath anode can be relieved, the production power consumption can be reduced, the tank washing period can be prolonged, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a method for removing impurities, in particular to a method for removing impurities in brine in a sodium chlorate production process. Background technique [0002] The production process of sodium chlorate generally includes brine treatment process, electrolysis process, crystallization drying process and so on. The quality of brine directly affects the power consumption and washing cycle, and the presence of impurities will also corrode the anode, so the brine treatment process plays an important role in the entire production process. [0003] Sodium chlorate manufacturers abroad pay great attention to the purification of brine. The sodium chloride used in the production of sodium chlorate in North America and European countries is refined sodium chloride, which has extremely low calcium and magnesium content and less impurity content, so the brine refining process has a short production line and less slag discharge. This re...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 黄丽婕王双飞农光再覃程荣李许生詹磊杨莹
Owner GUANGXI UNIV
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