A method for removing cyanide in cyanide-containing wastewater by using ionic liquid supported liquid membrane technology

An ionic liquid, supporting liquid membrane technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems that wastewater is difficult to meet discharge standards, cannot destroy metal complexes, and is difficult to synthesize pharmaceuticals. , to achieve the effect of short enrichment period, mild operating conditions and large enrichment multiples

Inactive Publication Date: 2017-11-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

Alkaline chlorination is currently a widely used method for treating cyanidation wastewater in China. It has a relatively deep treatment degree and can better meet the needs of cyanide wastewater discharge. Its shortcoming is that it cannot destroy stable metal complexes; The treatment effect of the ferrate oxidation method is similar to that of the alkaline oxidation method, and no environmentally harmful substances are produced in the process of breaking cyanide, but its disadvantage is that the synthesis of the medicament is difficult and the cost is too high. Large-scale popularization and application in treatment; acidification volatilization-alkali absorption method is a traditional method for treating high and medium concentration cyanide wastewater. The impact is small, but the disadvantage is that the treated wastewater is generally difficult to meet the discharge standard, and secondary treatment is required to meet the discharge standard
Compared with other methods, the membrane separation method has no secondary pollution, can realize the recycling of pollutants, has low energy consumption, and has good economic effects, but the disadvantage is that the membrane pollution is more serious

Method used

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  • A method for removing cyanide in cyanide-containing wastewater by using ionic liquid supported liquid membrane technology

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Experimental program
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Effect test

Embodiment 1

[0025] As shown in Figure 1, the sodium hydroxide solution of 1.0mol / L, 3.0mol / L, and 5.0mol / L is used as the analytical phase, and the liquid phase is 468.36mg / L of cyanide wastewater (from a gold smelting factory in Henan). Plant, the pH has been adjusted with sulfuric acid to be 5), the stirring extraction time is 60min, and the stirring speed is 200rmp. After the ionic liquid supported liquid membrane extraction, the removal rates of cyanide in the wastewater are 82.92%, 95.05%, and 87.06%, respectively.

Embodiment 2

[0027] As shown in Figure 1, with 3.0mol / L sodium hydroxide solution as the analytical phase, cyanide wastewater of 117.09mg / L, 234.18mg / L, and 468.36mg / L (from a gold smelter in Henan, which has been Sulfuric acid was used to adjust the pH to 5) as the material-liquid phase, the stirring extraction time was 60min, and the stirring speed was 200rmp. After extraction by the ionic liquid supported liquid membrane, the removal rates of cyanide in the wastewater were 80.95%, 89.60%, and 95.05%, respectively.

Embodiment 3

[0029] As shown in Figure 1, with 3.0mol / L sodium hydroxide solution as the analytical phase, three groups of cyanide wastewater with a concentration of 468.36mg / L in the material liquid phase (from a gold smelter in Henan Province, the pH was adjusted with sulfuric acid to 1, 3, 5), the stirring extraction time is 60min, and the stirring speed is 200rmp. After extraction by the ionic liquid support liquid membrane, the removal rates of cyanide in the wastewater are 72.95%, 87.90%, and 95.05%, respectively.

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Abstract

A method for removing cyanide in cyanide-containing wastewater by using ionic liquid supported liquid membrane technology, using membrane hydrophobic polyvinylidene fluoride microporous filter membrane as porous carrier, and using 1-butyl-3-methylimidazole hexafluorophosphate It is an ionic liquid, and the porous carrier membrane is immersed in the ionic liquid by an impregnation method. Due to the effect of surface tension, the ionic liquid fills the membrane pores of the carrier membrane to form an ionic liquid supporting liquid film; the supporting liquid film is fixed in the feed liquid phase (cyanide) In the middle of the liquid waste water) and the analysis phase (sodium hydroxide solution), stirring and mass transfer are carried out on both sides of the liquid film, and finally enrichment and recovery of cyanide in the analysis solution; the present invention imitates the characteristics of active transport of biofilm, and has good selectivity, High separation efficiency, large enrichment multiple, low energy consumption, easy operation, short treatment cycle, cyanide can be recycled, easy for engineering application, and the advantages of reusable membrane phase, the removal rate can reach more than 95%, It can realize efficient treatment of cyanide and resource recovery.

Description

technical field [0001] The invention belongs to the technical field of environmental chemical industry, and in particular relates to a method for removing cyanide in cyanide-containing wastewater by using ionic liquid supported liquid membrane technology. Background technique [0002] In the process of industrial production, the sources of cyanide are very extensive. There are various production processes such as metallurgy, mineral processing, metal processing, plastics, electroplating, pesticides, coking, oil refining, heat treatment, and plexiglass / acrylonitrile synthesis. Etc. cyanide-containing wastewater discharged. Conventional methods for treating cyanide wastewater can be roughly divided into two types: destruction method and recovery method. The destruction method is mainly for low-concentration cyanide wastewater, and the recovery method is mainly for high-concentration cyanide wastewater and some cyanide wastewater containing recovery value metals. Alkaline chlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F1/58C02F101/38
CPCC02F1/26C02F1/58C02F2101/38
Inventor 薛娟琴李国平毕强刘妮娜
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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