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Method for comprehensively utilizing sodium sulfate-sodium chloride mixed salt

A technology of sodium sulfate and sodium chloride, applied in chemical instruments and methods, ammonium chloride, ammonia compounds, etc., can solve the problems of sodium sulfate-sodium chloride mixed salt unable to find a market, unpurified wastewater, secondary pollution, etc. , to achieve the effect of high comprehensive utilization rate, convenient operation and good economic benefits

Active Publication Date: 2022-05-27
宁波弗镁瑞环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, at present, many metallurgical and chemical enterprises are facing an extremely embarrassing situation. The waste water produced in the production process cannot be purified, and the sodium sulfate-sodium chloride mixed salt obtained by purification cannot find a market.
Therefore, the sodium sulfate-sodium chloride mixed salt obtained from wastewater purification can only be stored in a warehouse. As time goes by, the pressure on the inventory is increasing, and sodium sulfate and sodium chloride are both water-soluble materials. Once mismanaged, it will cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use sodium chloride and sodium sulfate as raw materials, and use ammonium bicarbonate as a resolving agent to prepare sodium carbonate, ammonium sulfate and ammonium chloride. Weigh 210.01g of sodium chloride and 420.03g of anhydrous sodium sulfate, add 700mL of water to mix, stir and heat to 25°C, and slowly add 827.32g of ammonium bicarbonate to the slurry in batches. The reaction slurry containing a large amount of sodium bicarbonate and ammonium chloride crystals was frozen at -11°C for 6 hours, further crystallized, and filtered to obtain 1001.6 g of a mixture of primary crystals and secondary crystals and 643 mL of secondary crystallization mother liquor, secondary crystallization mother liquor Contains Na + 18.21g / L, Cl - 16.17g / L. The obtained secondary crystallization mother liquor was evaporated and concentrated to ~250 mL, cooled to room temperature, and filtered to obtain 264.83 g of tertiary crystals and 143 mL of tertiary crystallization mother liquor. ...

Embodiment 2

[0042] With the waste water that catalyst production process produces, the solution that contains sodium sulfate and sodium chloride obtained through purification and concentration is made raw material, wherein contains Na + 142.08g / L, Cl - 82.81g / L, SO 4 2- 184.42g / L, take 2m 3 Purify the concentrated solution, slowly add 1142.17kg of ammonium bicarbonate in batches with stirring at room temperature, after the addition of ammonium bicarbonate, the temperature is raised to 30 °C and continue to stir for 1 h, filter to obtain primary crystals and primary crystallization mother liquor, and then place primary crystallization mother liquor at -12.5 °C freezing and crystallizing at a temperature of 5 h, forcing the Na + and Cl - It is further crystallized in the form of sodium bicarbonate and ammonium chloride, and filtered to obtain secondary crystals and secondary crystal mother liquor. The secondary crystallization mother liquor was evaporated and concentrated to ~0.5m 3 ,...

Embodiment 3

[0044] The mixed sodium salt of the khaki-yellow sodium sulfate with peculiar smell and sodium chloride obtained with zinc smelting wastewater purification is made raw material, wherein Na 2 SO 4 and NaCl contents were 78.62% and 12.08%, respectively. First, the mixed sodium salt was heated to ~350°C in the air to carbonize the organic matter, cooled to ~60°C, stirred and dissolved in water to obtain Na. + The ion concentration is a dissolving solution of 151.16g / L, and adding sodium carbonate to the dissolving solution to adjust the pH to 8.6, filtering and removing the solid suspension therein to obtain a clear purified solution. Take 3L of the purified solution, and use CO 2 / NH 3 The mixed gas with a molar ratio of 1.03:1 was used as a resolving agent, and it was slowly blown into the purified liquid at 15 °C with stirring, and the NH 3 / Na +The molar ratio rose to 1.06:1, stopped blowing the mixed gas, continued stirring for 1 hour, separated the slurry and filtered ...

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Abstract

The invention discloses a method for comprehensively utilizing a sodium sulfate-sodium chloride mixed salt, which comprises the following steps: by taking the sodium sulfate-sodium chloride mixed salt and a solution thereof as raw materials and ammonium bicarbonate as a resolving agent, forcing Na < + > ions and Cl <-> ions in the solution to crystallize and separate out in the form of sodium bicarbonate and ammonium chloride by skillfully utilizing the same ion effect generated by HCO3 <-> ions and NH4 < + > ions; sodium, sulfate radicals and chlorine in the mixed salt are fully and effectively separated and utilized through gradient crystallization and reverse refining by utilizing a multi-phase crystallization-dissolution equilibrium relationship of sodium bicarbonate, ammonium bicarbonate, ammonium sulfate, ammonium chloride, ammonium sulfate and sodium chloride under different conditions, and three qualified products of sodium carbonate, ammonium sulfate and ammonium chloride are directly produced; the method has the advantages of simple process, high comprehensive utilization rate, good economic benefit, convenience in operation and the like, and is suitable for industrial production of comprehensive utilization of the sodium sulfate-sodium chloride mixed salt and the solution thereof.

Description

technical field [0001] The invention belongs to the fields of chemical industry and environmental protection, and in particular relates to a method for comprehensive utilization of sodium sulfate-sodium chloride mixed salt. Background technique [0002] Sodium sulfate-sodium chloride mixed salt is the chemical and metallurgical industry that uses sulfuric acid to treat chlorine-containing materials, or uses hydrochloric acid to treat sulfate-containing materials, and uses sulfuric acid and hydrochloric acid or sodium chloride to treat reaction materials. Wastewater containing sodium chloride is solid waste obtained after purification, impurity removal, evaporation and concentration. Sodium sulfate-sodium chloride mixed salt is a colorless or earth-yellow or earth-grey powder. In addition to sulfur, sodium and chlorine, the earth-yellow or earth-grey powder also contains iron, aluminum, silicon and lead. , arsenic and other impurities and sediment. The National Inventory of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/244C05C3/00C01C1/16C01D7/12
CPCC01C1/244C05C3/00C01C1/164C01D7/12C01P2006/80Y02A40/20
Inventor 王学文王懿
Owner 宁波弗镁瑞环保科技有限公司
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