Treatment method of sulfur-containing waste salt and solution thereof

A processing method and solution technology, applied in the direction of ammonium sulfate, chemical instruments and methods, alkali metal sulfite/sulfite, etc., can solve the problem of low purity of sodium sulfate and ammonium sulfate products, increased operating costs, and energy consumption. Advanced problems, to achieve the effect of low cost, clean process and simple process

Inactive Publication Date: 2021-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the phase diagram of the water-salt system of sodium sulfate and ammonium sulfate, double salts will appear in the three cooling processes of the method, so that the purity of sodium sulfate and ammonium sulfate products is relatively low, and the energy consumption in the repeated cooling and heating process is high, which is extremely high. greatly increased operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a treatment method for sulfur-containing waste salt, the treatment method comprising the following steps:

[0055] (1) Mixing sulfur-containing waste salt with water to prepare a saturated solution of sulfur-containing waste salt; the mass fractions of sodium sulfate and ammonium sulfate in the sulfur-containing waste salt are both 50wt%;

[0056] (2) Mix the sulfur-containing waste salt with the saturated solution obtained in step (1), carry out high-temperature salting-out at 85° C. for 1.5 h, and obtain the salting-out mother liquor and sodium sulfate after filtering;

[0057] (3) The salting-out mother liquor obtained in step (2) is cooled and crystallized at 25°C, and after filtration, the ammonium sulfate mother liquor and mixed salt are obtained; the mixed salt is reused in step (2), and the amount of the mixed salt added Taking the nitrogen content in the saturated solution as the standard, specifically adding the mixed salt until the ni...

Embodiment 2

[0061] This embodiment provides a treatment method for a sulfur-containing waste salt solution, the treatment method comprising the following steps:

[0062] (1) The solution of sulfur-containing waste salt is heated, evaporated and concentrated at 95°C to prepare a saturated solution of sulfur-containing waste salt; the mass fraction of sodium sulfate in the solution of sulfur-containing waste salt is 50wt%, and the mass fraction of ammonium sulfate The mass fraction is 10wt%;

[0063] (2) mixing the sulfur-containing waste salt with the saturated solution obtained in step (1), performing high-temperature salting-out at 80° C. for 2 hours, and obtaining the salting-out mother liquor and sodium sulfate after filtering;

[0064] (3) The salting-out mother liquor obtained in step (2) is cooled and crystallized at 20°C, and after filtration, the ammonium sulfate mother liquor and mixed salt are obtained; the mixed salt is reused in step (2), and the amount of the mixed salt added...

Embodiment 3

[0068] This embodiment provides a treatment method for sulfur-containing waste salt and its solution, the treatment method comprising the following steps:

[0069] (1) Mix the solution of sulfur-containing waste salt and sulfur-containing waste salt to prepare a saturated solution of sulfur-containing waste salt; the mass fraction of sodium sulfate in the sulfur-containing waste salt is 25wt%, and the massfraction of ammonium sulfate is 75wt% ; The mass fraction of sodium sulfate in the solution of sulfur-containing waste salt is 15wt%, and the mass fraction of ammonium sulfate is 10wt%;

[0070] (2) mixing the sulfur-containing waste salt with the saturated solution obtained in step (1), performing high-temperature salting-out at 60° C. for 3 hours, and obtaining the salting-out mother liquor and sodium sulfate after filtering;

[0071] (3) The salting-out mother liquor obtained in step (2) is cooled and crystallized at 0°C, and after filtration, the ammonium sulfate mother l...

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Abstract

The invention provides a treatment method of sulfur-containing waste salt and a solution thereof. The treatment method comprises the steps of (1) preparing a saturated solution of the sulfur-containing waste salt; (2) mixing the sulfur-containing waste salt with the saturated solution obtained in the step (1), carrying out high-temperature salting-out, and carrying out solid-liquid separation to obtain salting-out mother liquor and sodium sulfate; (3) carrying out cooling crystallization on the salting-out mother liquor obtained in the step (2), and carrying out solid-liquid separation to obtain ammonium sulfate mother liquor and mixed salt; the mixed salt being reused in the step (2); and (4) evaporating and concentrating the ammonium sulfate mother liquor obtained in the step (3), and carrying out solid-liquid separation to obtain evaporated mother liquor and ammonium sulfate; the evaporation mother liquor being reused in the step (3). The treatment method is suitable for the sulfur-containing waste salt and a solution of the sulfur-containing waste salt, efficient separation of sodium sulfate and ammonium sulfate is achieved, meanwhile, the operation process is simplified, the production cost is reduced, and no three wastes are generated.

Description

technical field [0001] The invention belongs to the technical field of waste treatment, and relates to a treatment method for industrial waste salt, in particular to a treatment method for sulfur-containing waste salt and its solution. Background technique [0002] In many industrial productions, such as petroleum smelting catalytic process, sodium bicarbonate desulfurization and regeneration process, vanadium precipitation process, H acid production process and alkali production process using sodium sulfate as raw material, a large amount of by-product wastewater will be generated. These by-product wastewater are mainly composed of sodium sulfate and ammonium sulfate, and some also contain a small amount of heavy metals. If they are directly discharged into the environment, they will not only pollute the water body and soil, but also seriously harm aquatic organisms, and even enter the human body through the food chain. Significantly increase the risk of human disease. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01C1/24
CPCC01C1/24C01D5/00C01P2006/80
Inventor 张洋范兵强张贺东申长帅郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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