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Sodium dichromate closed circulation clean production method for preparing sodium chlorate

A sodium dichromate and closed-circuit cycle technology, applied in the direction of chloric acid and chlorate, can solve the problems of increasing air pollution, deteriorating the atmospheric environment, and human injury, achieving low production costs, increasing benefits, and eliminating chromium salt mud the effect of

Inactive Publication Date: 2014-04-30
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hexavalent chromium salt sludge produced at the end of the above production process will cause great harm to the environment and even human beings
If the chromium salt mud is stacked in the open air, it will inhibit the growth of plants and kill microorganisms in the water; it will cause natural disasters such as landslides and mudslides
After a long period of wind and sun, the dust in the chromium slag will fly with the wind, which will increase the pollution of the air and seriously deteriorate the atmospheric environment.

Method used

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  • Sodium dichromate closed circulation clean production method for preparing sodium chlorate
  • Sodium dichromate closed circulation clean production method for preparing sodium chlorate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] combined with figure 2 Shown, the concrete steps of preparing sodium chlorate are:

[0042] Use industrial water to dissolve industrial salt to prepare saturated brine;

[0043] Add sodium carbonate and sodium hydroxide at one time and stir to react with calcium and magnesium ions in the brine to form barium carbonate precipitates and magnesium hydroxide colloidal substances. The volume ratio of sodium oxide mass to brine is 0.5g / L. After settling, supernatant brine 1 enters a tubular ceramic membrane filtration system with a pore size of 50nm. The filtration method is cross-flow filtration to obtain first-grade refined brine;

[0044] The primary refined brine was adjusted to pH 2 with concentrated hydrochloric acid, and then barium chloride was metered in at one time, so that the SO in the brine 4 2- Concentration of 0.5mg / L, Ba in brine 2+ The control amount is 93mg / L. After settling, the precipitate barium sulfate plate and frame filter press is carefully press...

Embodiment 2

[0048] Collect the saline wastewater in the factory (without organic matter, S, P, N, etc.) and other reusable wastewater for desalination to form saturated crude brine, and the supernatant of the crude brine overflows to the brine and refining system;

[0049] Add sodium carbonate and sodium hydroxide at one time and stir to react with calcium and magnesium ions in the brine to form barium carbonate precipitates and magnesium hydroxide colloidal substances. The volume ratio of sodium oxide mass to brine is 0.5g / L. After settling for 0.5h, supernatant brine 1 enters a tubular ceramic membrane filtration system with a pore size of 50nm (the filtration method is cross-flow filtration) to obtain first-grade refined brine;

[0050] Obtain the first grade refined brine, the content of each component in the brine is: NaCl>300g / L, Ca 2+ +Mg 2+ 4 2- Between 0.5 ~ 1.5g / L, without water insoluble matter;

[0051] The primary refined brine was adjusted to pH 3 with concentrated hydroc...

Embodiment 3

[0054] Collect the saline wastewater in the factory (without organic matter, S, P, N, etc.) and other reusable wastewater for desalination to form saturated crude brine, and the supernatant of the crude brine overflows to the brine and refining system;

[0055] Add sodium carbonate and sodium hydroxide at one time and stir to react with calcium and magnesium ions in the brine to form barium carbonate precipitates and magnesium hydroxide colloidal substances. The volume ratio of sodium oxide mass to brine is 0.5g / L. After settling for 1 hour, supernatant brine 1 enters a tubular ceramic membrane filtration system with a pore size of 50nm (the filtration method is cross-flow filtration) to obtain first-grade refined brine;

[0056] Obtain the first grade refined brine, the content of each component in the brine is: NaCl>300g / L, Ca 2+ +Mg 2+ 4 2- Between 0.5 ~ 1.5g / L, without water insoluble matter;

[0057] The primary refined brine was adjusted to pH 4 with concentrated hydr...

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Abstract

The invention discloses a sodium dichromate closed circulation clean production method for preparing sodium chlorate. A sodium dichromate closed circulation clean production technique in a sodium chlorate production process is proposed in the method, and the clean sodium chlorate production without chromium slag emission is realized by using the method. A ceramic membrane filtering technology is adopted, and a clean production process comprising the steps of salt dissolving, double-alkaline pretreatment, ceramic membrane, barium chloride process pretreatment, barium sulfate recovery, ceramic membrane, electrolysis, crystallization and electrolysis is proposed, so that the concentration of NaCl entering saline water in an electrolytic tank is larger than or equal to 300g / L, the contents of Ca<2+>, Mg<2+>, SO4<2-> and Ba<2+> meet an electrolysis requirement, the content of SO4<2-> in a crystallized mother solution is lower than 1mg / L, the electrolysis can be directly carried out without treating the mother solution, so that chromium slag is prevented from being generated. The sodium dichromate closed circulation clean production method in a sodium chlorate production process, disclosed by the invention, has the advantages of discharging no chromic salt mud, saving the precious chromium resource, solving the discharging problem of hexavalent chromium generated by sodium chlorate plants and generating a certain economic benefit.

Description

technical field [0001] The invention relates to a production method for preparing sodium chlorate, in particular to the clean production technology of sodium dichromate closed-circuit circulation in the sodium chlorate production process. Background technique [0002] Sodium chlorate is an important inorganic chemical product with a wide range of applications and markets worldwide. Mainly used in papermaking, disinfection, drinking water treatment, production of other chemical products and other fields. In the world, 92% of sodium chlorate is used as raw material for pulp treatment and drinking water treatment. At present, the production and sales volume of sodium chlorate in the world is about 3 million tons. The production methods of sodium chlorate mainly include chemical method and electrolytic method. The chemical method uses lime as a raw material, which is made into milk of lime and then chlorinated. Add sodium sulfate or sodium carbonate to the calcium chlorate s...

Claims

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Application Information

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IPC IPC(8): C01B11/14
Inventor 张永锋崔景东李春萍
Owner INNER MONGOLIA UNIV OF TECH
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