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Waste salt resourceful treatment system and treatment method thereof

A processing system and recycling technology, applied in the waste salt recycling processing system and its processing field, can solve the problems of low utilization rate of CO2, and achieve the effects of better product quality, wide application range and simple reaction equipment.

Pending Publication Date: 2022-03-11
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But overall, the captured CO 2 Utilization rate is relatively low

Method used

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  • Waste salt resourceful treatment system and treatment method thereof
  • Waste salt resourceful treatment system and treatment method thereof
  • Waste salt resourceful treatment system and treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] A method for recycling waste salt, specifically comprising the following steps:

[0112] S1, sodium chloride refining

[0113] S11. Low-temperature carbonization: Carry out low-temperature carbonization on the waste salt to remove organic matter. The low-temperature carbonization temperature is 200-500° C. to obtain waste sodium chloride salt with a TOC content of less than 30 mg / kg;

[0114] S12, water washing: add water to the sodium chloride waste salt obtained in step S11, dissolve, and obtain a waste salt solution with a mass fraction of 10-20%, add heavy metal precipitant, sodium carbonate and quicklime to the waste salt solution, soften and wash with water, remove Heavy metals and calcium and magnesium ions to obtain softened waste liquid;

[0115] S13. Membrane filtration: performing ultrafiltration, nanofiltration and reverse osmosis on the softened waste liquid obtained in step S12 to obtain a concentrated filtration solution;

[0116] S14, crystallization: ...

Embodiment 2

[0130] A waste salt recycling treatment method, the difference from Embodiment 1 is:

[0131] S3, resource utilization

[0132] S31, preparation of sodium bicarbonate: at normal temperature (25° C.), add water to the refined sodium chloride obtained in step S1 to form a saturated brine solution; cool the saturated brine solution, send it into the ammonia absorption tower, and utilize the ammonia gas and the saturated brine solution Countercurrent contact for ammonia absorption, FNH control 3 / TCl - The value of the value of 1.12 is taken as 1.12, and the ammonia brine solution with a temperature of 68°C is obtained; the obtained ammonia brine is sent to the cleaning tower, and the temperature is lowered to 40°C, and the scale on the tower body and the cooling pipe wall in the ammonia brine solution is removed, and the desired Carbonated brine: send the obtained pre-carbonated brine into the carbonization tower, and pass into the carbon dioxide obtained in step S2 for carbona...

Embodiment 3

[0140] A waste salt recycling treatment method, the difference from Embodiment 1 is:

[0141] S3, resource utilization

[0142] S31, preparation of sodium bicarbonate: at normal temperature (25° C.), add water to the refined sodium chloride obtained in step S1 to form a saturated brine solution; cool the saturated brine solution, send it into the ammonia absorption tower, and utilize the ammonia gas and the saturated brine solution Countercurrent contact for ammonia absorption, FNH control 3 / TCl - The value of 1.10 is taken as 1.10 to obtain an ammonia brine solution with a temperature of 65°C; the obtained ammonia brine is sent to a cleaning tower, and the temperature is lowered to 39°C to remove the scale on the tower body and the cooling pipe wall in the ammonia brine solution, and obtain the desired Carbonated brine: send the obtained pre-carbonated brine into the carbonization tower, and pass into the carbon dioxide obtained in step S2 for carbonation. According to act...

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Abstract

The invention discloses a waste salt resourceful treatment system and a waste salt resourceful treatment method. Comprising a sodium chloride refining unit for refining and recovering sodium chloride in waste salt, a carbon dioxide unit for capturing and purifying industrial carbon dioxide waste gas, and industrial baking soda produced by using refined sodium chloride produced by the sodium chloride refining unit and carbon dioxide produced by the carbon dioxide unit, and a resource utilization unit of sodium carbonate and ammonium chloride. According to the invention, the waste salt and the industrial carbon dioxide tail gas are used as raw materials to obtain high-purity industrial-grade baking soda, soda ash, ammonium chloride and other products, so that resource recycling of the waste salt and the industrial carbon dioxide is realized, and the energy-saving and emission-reducing effects are remarkable. Compared with the prior art, the product prepared by the method is higher in purity and better in quality.

Description

technical field [0001] The invention relates to the technical field of waste salt treatment, in particular to a waste salt resource treatment system and a treatment method thereof. Background technique [0002] Industrial waste salt has the characteristics of complex composition, wide sources, and high toxicity. In the process of industrial production, such as high-salt wastewater treatment, pesticide production, and fly ash washing treatment, a large amount of industrial waste salt will be generated, mainly referring to solid waste with inorganic salt as the main component, and the annual output of waste salt exceeds 2.0× 10 7 t, the main components are sodium chloride and sodium sulfate, with sodium chloride as the main ingredient. According to the destination of waste salt after disposal, waste salt disposal methods can be divided into sea discharge, landfill and resource utilization. In foreign countries, the disposal of waste salt mostly adopts harmless treatment and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01B32/50C01D3/22C01D7/16C01D7/38C01C1/16
CPCC01D3/14C01D3/22C01D7/16C01D7/38C01C1/164C01B32/50C01P2006/80Y02P20/141
Inventor 冯华军贾杰梁禹翔夏伊静丁养城徐颖峰
Owner ZHEJIANG GONGSHANG UNIVERSITY
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