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Recovery method for waste salt

A salt recovery and filtrate technology, applied in the direction of alkali metal halide purification, can solve the problems of high heavy metal content and product difference, and achieve the effect of low salt heavy metal content and good quality

Inactive Publication Date: 2019-10-18
航天国环技术集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the salt recovered by the prior art has the following problems: high content of heavy metals, poor quality

Method used

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  • Recovery method for waste salt
  • Recovery method for waste salt
  • Recovery method for waste salt

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0018] figure 1 It is a schematic diagram of the composition of the salt recovery system provided by the invention, such as figure 1 As shown, the salt recovery system 1 provided by the present invention includes: a water washing device 2, a water washing liquid treatment device 3, a drying device 4 and a granulation device 5, and the water washing device 2 is used to remove chlorine from the combustion flue gas generated by the factory. The dust is washed with water to generate a slurry and solid-liquid separation to generate a washing filtrate; the washing liquid treatment device 3 is used to remove heavy metals in the washing filtrate provided by the washing device and adjust the concentration of the washing liquid; the drying device 4 is used to wash the washing liquid The washing liquid provided by the processing device is dried; the granulating device 5 is used to granulate the dried product generated by the drying device 4 .

[0019] Washing device 2 comprises: storage...

no. 2 example

[0030] figure 2 It is a schematic diagram of the composition of the salt recovery system provided by the modified example of the present invention, such as figure 2 As shown, the salt recovery system 10 provided by the present invention includes: a water washing device 6, a water washing liquid treatment device 7, a drying device 8 and a granulation device 9, wherein the water washing device 6 is used for the combustion flue gas produced by the factory The chlorine-containing dust is washed with water to form a slurry and solid-liquid separation to generate a washing filtrate; the washing liquid treatment device 7 is used to remove heavy metals from the washing filtrate L1 discharged from the washing device and adjust the calcium concentration in the filtrate L1. Washing device 6 comprises: storage tank 61, dissolving tank 62, filter 63 and hot water tank 64, and dissolving tank 62 is used for making the chlorine-containing salt dissolving in the chlorine-containing dust D t...

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Abstract

The invention provides a recovery method for waste salt. The method comprises the following steps: sequentially adding sodium sulfide nonahydrate, lead sulfide and thallium into a filtrate containinga chlorine component, and adding an acid and ferric chloride to reduce selenium; adding lime milk, adjusting the pH to 8.0-9.0, performing condensation on ferrous hydroxide to separate out the ferroushydroxide; and adjusting a concentration of the filtrate, and drying the treated filtrate to recover the salt. The salt recovered by the method provided by the invention has a low content of heavy metals and a better grade.

Description

technical field [0001] The invention relates to a method for recovering waste salt, which belongs to the technical field of waste treatment. Background technique [0002] The prior art provides a method for recovering chlorine-containing waste salt: adding water to chlorine-containing waste salt to dissolve chlorine in chlorine-containing waste salt, filter and dry. However, the salt recovered by the prior art has the following problems: high content of heavy metals and poor quality. Contents of the invention [0003] In order to overcome the shortcomings in the prior art, the object of the present invention is to provide a method for recovering waste salt, the salt recovered by the method has low heavy metal content and good appearance. [0004] In order to achieve the purpose of the invention, it is necessary to invent and provide a method for recovering waste salt, which is characterized in that it includes the following steps: providing the filtrate containing chlorin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14
CPCC01D3/14
Inventor 李开功
Owner 航天国环技术集团有限公司