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Method for removing cyanides in cyaniding wastewater by use of emulsion liquid membrane technology

A technology of emulsion liquid membrane and cyanide wastewater, which is applied in chemical instruments and methods, water/sewage treatment, extraction water/sewage treatment, etc., can solve the problems of insufficient treatment depth, direct and convenient destruction, waste of resources, etc., and achieve enrichment Short cycle, easy follow-up processing, good effect

Inactive Publication Date: 2014-03-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The destruction method is direct and convenient, but it causes a waste of resources; the recycling method can recycle resources within a certain range, but there are problems such as high cost and insufficient processing depth

Method used

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  • Method for removing cyanides in cyaniding wastewater by use of emulsion liquid membrane technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] like figure 1 As shown, the emulsion preparation of the present embodiment is that TOA, liquid paraffin, Span-80, kerosene, sodium hydroxide internal phase liquid are respectively in volume ratio 2:1:2:95:100, 2:1:3:94: 100, 2:1:4:93:100 mix well and set aside. The mixed solution was mixed under a high-shear mixing emulsifier at a rotation speed of 2300r / min for 10min to obtain an emulsion liquid film. Adjust the pH of the cyanide wastewater to 4, mix the emulsion film and the cyanide wastewater evenly at a volume ratio of 1:7, and mechanically stir and contact them for 15 minutes at a speed of 250r / min. The above mixed solution was left to stand at room temperature for phase separation to obtain a liquid film and a treated aqueous phase. The liquid film phase and the internal water phase are mechanically stirred to break the demulsification, and then stand still to obtain a sodium cyanide-enriched water phase, and the cyanide is recovered. After treatment, the remov...

Embodiment 2

[0022] like figure 1 As shown, the emulsion preparation of this embodiment is to mix TOA, liquid paraffin, Span-80, kerosene, and sodium hydroxide internal phase liquid in a volume ratio of 2:1:4:93:100, respectively. The mixed solution was mixed under a high-shear mixing emulsifier at a rotation speed of 2300r / min for 10min to obtain an emulsion liquid film. For the cyanidation wastewater with an initial concentration of 644.46mg / L, 483.35mg / L, and 322.23mg / L, the pH of the wastewater was adjusted to 4, and the emulsion liquid film and the cyanide wastewater were mixed evenly at a volume ratio of 1:7. Contact with mechanical stirring for 15 minutes at a speed of 1 / min. The above mixed solution was left to stand at room temperature for phase separation to obtain a liquid film and a treated aqueous phase. The liquid film phase and the internal water phase are mechanically stirred to break the demulsification, and then stand still to obtain a sodium cyanide-enriched water phas...

Embodiment 3

[0024] like figure 1 As shown, the emulsion preparation of this embodiment is to mix TOA, liquid paraffin, Span-80, kerosene, and sodium hydroxide internal phase liquid in a volume ratio of 2:1:4:93:100, respectively. The mixed solution was mixed under a high-shear mixing emulsifier at a rotation speed of 2300r / min for 10min to obtain an emulsion liquid film. Adjust the pH of the wastewater to 4, mix the emulsion liquid film and cyanide wastewater evenly at a volume ratio of 1:7, and mechanically stir and contact them for 15 minutes at a speed of 250r / min. The above mixed solution was left to stand at room temperature for phase separation to obtain a liquid film and a treated aqueous phase. The liquid film phase and the internal water phase are mechanically stirred to demulsify and then left to stand to obtain a water phase rich in sodium cyanide, the cyanide is recovered, and the obtained oil phase is reused many times. The emulsion reused many times continued to treat the ...

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Abstract

The invention discloses a method for removing cyanides in cyaniding wastewater by use of an emulsion liquid membrane technology, which comprises the steps of dissolving a surfactant into a membrane solvent, and adding a carrier, a membrane auxiliary and sodium hydroxide internal-phase liquid; mixing, and preparing a white water-in-oil type emulsion liquid membrane by an emulsion maker; performing a mixing reaction between the emulsion liquid membrane and the cyaniding wastewater; then demulsifying, and enriching and recycling the cyanides. By imitating the characteristic of active transmission of a biological membrane, the method disclosed by the invention has the characteristics of good selectivity, high separation efficiency, great enrichment multiple, low energy consumption, simplicity in operation and short treatment period; the cyanides can be recycled, and engineering application is easy to implement; moreover, due to the advantage of repeated utilization of the membrane, the removal rate can exceed 95%, and efficient treatment and resource recycling of cyanides can be realized.

Description

technical field [0001] The invention belongs to the field of environmental chemical industry, and in particular relates to a method for removing cyanide in cyanide wastewater by using emulsion liquid membrane technology. Background technique [0002] Cyanide is a highly toxic substance with a wide range of sources, and a large amount of cyanide wastewater will be generated in electroplating, mineral processing, rare metal smelting, agriculture, medicine and other industries. Cyanide wastewater has caused serious harm to human body and ecology. At present, the methods of treating cyanide wastewater developed at home and abroad can be roughly divided into two categories: destroying or recycling cyanide. In addition to the traditional alkaline chlorination method in the destruction method, activated carbon adsorption method, ozone oxidation method, ferrate oxidation method, photocatalytic oxidation method, biological method, etc. have been developed; And acidification volatili...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F1/44C02F1/58
Inventor 薛娟琴党龙涛李国平毕强蒋朦
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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