Method for efficiently separating and comprehensively utilizing mixed salt

A mixed salt and high-efficiency technology, applied in chemical instruments and methods, applications, ammonium salt fertilizers, etc., can solve the problems of different process routes and parameters, different components, high costs, and optimize process control conditions and resource utilization. High, excellent product quality effect

Active Publication Date: 2021-10-08
自然资源部天津海水淡化与综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Among the waste salt in my country's chemical industry, the amount of solid waste or hazardous waste produced by enterprises is large, the composition is complex, the toxicity is high, and the composition is not the same, the lack of feasible treatment and disposal technology, the resource utilization and harmless disposal of residues The overall level and degree of standardization are uneven, and some can only be stockpiled within the enterprise, causing great security risks
Usually, the treatment method of industrial waste salt is landfill or incineration, which is costly and difficult to deal with. The types and quantities of impurities contained in waste salt of different enterprises are different, and the process routes and parameters are different. It is difficult to replicate and promote technical methods.

Method used

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  • Method for efficiently separating and comprehensively utilizing mixed salt
  • Method for efficiently separating and comprehensively utilizing mixed salt
  • Method for efficiently separating and comprehensively utilizing mixed salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) will contain 53wt% NaCl and 47wt% Na 2 SO 4 The solid phase mixed salt 3kg that forms, forms mother liquor A after dissolving with 9kg water under normal temperature (consists of: NaCl 13.2%, NaCl 13.2%, NaCl 2 SO 4 11.8%, H 2 O 75.0%), mother liquor A is mixed with circulating mother liquor D to be mother liquor B 14.8kg (composed of: NaCl 15.3%, NaCl 2 SO 4 11.20%,H 2 O 73.5%), the mother liquor B was stirred and frozen at 0°C for 1h and then centrifuged, the solid phase was thenardite (Na 2 SO 4 .10H 2 (2, 3.8kg), 30 DEG C of drying, solid content is 81%, gets Glauber's salt amount 3.1kg (purity is 92.8%), meets the product requirement of standard GBT6009-2014;

[0026] (2) 10.6kg of mother liquor C obtained after mother liquor B was centrifuged, (composed of: NaCl 21.6%, NaCl 2 SO 4 2.3%,H 2 (076.1%), the mother liquor C is heated and evaporated, and NaCl begins to precipitate at 106° C., heated for 2 hours, and the evaporation amount is 5.9 kg. Th...

Embodiment 2

[0030] (1) will contain 57wt% NaCl and 43wt% Na 2 SO 4The solid phase mixed salt 3kg that forms, forms mother liquor A after dissolving with 9kg water under normal temperature (consists of: NaCl 14.2%, NaCl 14.2%, NaCl 2 SO 4 10.8%, H 2 O 75.0%), after mother liquor A is mixed with circulating mother liquor D, it is mother liquor B 14.6kg (composed of: NaCl 15.3%, NaCl 2 SO 4 11.20%,H 2 O 73.5%), the mother liquor B was stirred and frozen at 3°C ​​for 1h and then centrifuged, and the solid phase was thenardite (Na 2 SO 4 .10H 2 (2, 3.5kg), 30 ℃ of drying, solid content is 82%, and thenardite amount 2.9kg (purity is 91.9%), meets the product requirement of standard GBT6009-2014;

[0031] (2) 10.9kg of mother liquor C obtained after mother liquor B was centrifuged, (composed of: NaCl 22.6%, NaCl 2 SO 4 2.0%,H 2 (075.4%), the mother liquor C is heated and evaporated, and NaCl begins to be precipitated at 106° C., heated for 2 hours, and the evaporation amount is 5.9...

Embodiment 3

[0035] (1) will contain 55wt% NaCl and 45wt% Na 2 SO 4 The solid phase mixed salt 3kg that forms, forms mother liquor A after dissolving with 9kg water under normal temperature (composes: NaCl 13.7%, NaCl 2 SO 4 11.3%, H 2 O 75.0%), after mother liquor A is mixed with circulating mother liquor D, it is mother liquor B 14.4kg (composed of: NaCl 15.5%, NaCl 2 SO 4 11.0%,H 2 O 73.5%), the mother liquor B was stirred and frozen at 0°C for 2h and then centrifuged, and the solid phase was thenardite (Na 2 SO 4 .10H 2 (2, 4.0kg), 30 ℃ of drying, solid content is 80%, and thenardite amount 3.2kg (purity is 94.0%), meets the product requirement of standard GBT6009-2014;

[0036] (2) 10.4kg of mother liquor C obtained after the centrifugation of mother liquor B, (composed of: NaCl 21.5%, NaCl 2 SO 4 2.4%, H 2 (076.1%), the mother liquor C was heated and evaporated, and NaCl was precipitated at 105°C, heated for 2h, and the evaporation amount was 6.0kg, and the solid phase ...

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Abstract

The invention discloses a method for efficiently separating and comprehensively utilizing mixed salt. The method comprises the following steps: freezing the mixed salt to prepare mirabilite, cheating, evaporating and concentrating a nitrate-separating mother solution to prepare sodium chloride, co-producing sodium bicarbonate with the sodium chloride, and conducting cooling to separate out ammonium chloride after adding the salt for one time, wherein the mixed salt contains sodium chloride and sodium sulfate. Solid mixed salt resources are comprehensively utilized, mirabilite is processed into anhydrous mirabilite products meeting relevant standard requirements after efficient separation is achieved, ammonium chloride meeting agricultural quality requirements in GB / T2946-2008 Ammonium Chloride is prepared from sodium chloride and ammonium bicarbonate obtained through separation through a double decomposition reaction, the ammonium chloride is sold as an agricultural fertilizer, the purity of sodium bicarbonate is not lower than 88%, and the sodium bicarbonate can be used for production, so that solid wastes generated by enterprises are recycled.

Description

technical field [0001] The invention relates to the technical field of waste salt treatment, in particular to a method for efficient separation and comprehensive utilization of mixed salt. Background technique [0002] Among the waste salt in my country's chemical industry, the amount of solid waste or hazardous waste produced by enterprises is large, the composition is complex, the toxicity is high, and the composition is not the same, the lack of feasible treatment and disposal technology, the resource utilization and harmless disposal of residues The overall level and degree of standardization are uneven, and some of them can only be stockpiled inside the enterprise, causing great security risks. Usually, the treatment method of industrial waste salt is landfill or incineration, which is costly and difficult to deal with. The types and quantities of impurities contained in waste salt of different enterprises are different, and the process routes and parameters are differen...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C01C1/16C01D7/00C05C3/00
CPCC01C1/164C01D7/00C05C3/00Y02A40/20
Inventor路绍琰张欣郭淑元马来波钟云龙王亮武海虹
Owner自然资源部天津海水淡化与综合利用研究所