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Method for removing stannum from sewage

A sewage and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of not removing tin, and achieve low operating cost, remarkable treatment effect, and removal of tin. Tin efficient effect

Inactive Publication Date: 2014-05-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tin is mainly used in the electroplating industry. For the recovery of tin ions in sewage, there are many methods and processes, such as "a method for synthesizing zinc hexahydroxystannate by using nitric acid type tin stripping wastewater" with the classification number C01G19 / 00 (2006.01) I This method fixes and recovers tin in the form of products, and uses chemical precipitation to achieve the effect of removal, but at present there is no way to remove tin by using adsorption materials. The present invention is aimed at the blank in this field. A carbonized adsorption material for domestic waste products and its preparation method are proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] (1) Adding polyaluminum chloride and polyacrylamide flocculant to the wastewater containing tin contains flocculation and sedimentation treatment; (2) Adding 50 ppm of sodium thiosulfate solid to the wastewater for removing suspended particles, fully stirring, making Tin exists in the divalent form in the waste water; (3) add 8ppm organic alcohol and organic ether mixed solution in above-mentioned waste water again, wherein 65% ethylene glycol, 35% ethylene glycol dimethyl ether; (4) waste water is mixed with soda water Lift the pump into the pressure-dissolved air tank, release the air valve, release the soda-water mixture, and rise up with tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (5) scrape off the upper layer of greasy substance with a slag scraper, The tin in the wastewater can be reduced from 397mg / L to 0.2mg / L, and the tin removal rate reaches 99.94%.

example 2

[0022] (1) Adding polyaluminum chloride and polyacrylamide flocculant to the tin-containing waste water carries out flocculation and sedimentation treatment; (2) Adding 65ppm of sodium thiosulfate solid to the waste water for removing suspended particles, fully stirring to make Tin exists in the form of divalence in the waste water; (3) add 9ppm organic alcohol and organic ether mixed solution in above-mentioned waste water again, wherein 65% n-butanol, 35% ethyl butyl ether; (4) waste water is promoted to In the pressure dissolving gas tank, release the air valve again, the steam-water mixture is released, and rise up with the tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (5) scrape off the upper layer of greasy substance with a scraper to make the wastewater The tin in the solution was reduced from 425mg / L to 0.085mg / L, and the tin removal rate reached 99.98%.

example 3

[0024] (1) Adding polyaluminum chloride and polyacrylamide flocculant to the tin-containing waste water carries out flocculation and sedimentation treatment; (2) Adding 80 ppm of sodium thiosulfate solid to the waste water for removing suspended particles, fully stirring, so that Tin exists in the divalent form in the waste water; (3) add 10ppm organic alcohol and organic ether mixed solution in above-mentioned waste water again, wherein 62% isopropanol, 38% ethylene glycol dimethyl ether; (4) waste water is mixed with soda water Lift the pump into the pressure-dissolved air tank, release the air valve, release the soda-water mixture, and rise up with tiny bubbles until a layer of greasy substance is formed on the surface of the wastewater; (5) scrape off the upper layer of greasy substance with a slag scraper, The tin in the wastewater can be reduced from 378mg / L to 0.038mg / L, and the tin removal rate reaches 99.99%.

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Abstract

The invention discloses a method for removing stannum from sewage, and belongs to the field of sewage treatment in environmental protection. The method comprises the steps that polyaluminium chloride, a polyacrylamide flocculating agent, sodium thiosulfate solid, and an organic alcohol and organic ether mixed solution are added to stannum-bearing sewage; the sewage is stirred and lifted to a pressure dissolved air vessel; and then a purpose of stannum removal is achieved. Organic alcohol is one of glycol, n-butyl alcohol, isopropanol and diethylene glycol; and organic ether is one of glycol dimethyl ether and ethyl-n-butyl ether. The method has the characteristics that raw material sources are extensive; the price is low; the agent dosage is smaller; the operating cost is low; no secondary pollution is generated in a treatment process; the stannum removal efficiency is high; and the removal rate can reach above 99.9%.

Description

technical field [0001] The invention relates to a method for removing tin in sewage, which belongs to the field of waste water treatment in environmental protection. Background technique [0002] Tin is mainly used in the electroplating industry. For the recovery of tin ions in sewage, there are many methods and processes, such as "a method for synthesizing zinc hexahydroxystannate by using nitric acid type tin stripping wastewater" with the classification number C01G19 / 00 (2006.01) I This method fixes and recovers tin in the form of products, and uses chemical precipitation to achieve the effect of removal, but at present there is no way to remove tin by using adsorption materials. The present invention is aimed at the blank in this field. A carbonized adsorption material of domestic waste products and its preparation method are proposed. [0003] Household waste is a resource with broad prospects. At present, the reuse of domestic waste is constantly developing, especiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 雷春生汪巍
Owner CHANGZHOU UNIV