Method for removing cyanide in cyanogen-containing waste water by ionic liquid supported liquid membrane technology

Abstract

The invention discloses a method for removing cyanide in cyanogen-containing waste water by an ionic liquid supported liquid membrane technology. The technology comprises that a hydrophobic polyvinylidene fluoride millipore filter membrane as a porous carrier is immersed in 1-butyl-3-methylimidazolium hexafluorophosphate as an ionic liquid by a dipping method, under the action of surface tension, membrane pores of the carrier membrane are filled with the ionic liquid so that an ionic liquid supported liquid membrane is formed, the ionic liquid supported liquid membrane is fixed between a material liquid phase (cyaniding waste water) and an analysis phase (a sodium hydroxide solution), and a stirring mass transfer process is carried at two sides of the liquid membrane, and cyanides are enriched and recovered in the analysis liquid. The method can simulate biological membrane active transport, has the characteristics of good selectivity, high separation efficiency, large enrichment multiple, low energy consumption, operation easiness and short treatment period, realizes cyanide recovery and recycle, can be engineered easily, realizes membrane phase recycle, has clearance of 95% or more, and realizes cyanide high efficiency treatment and resource recovery and recycle.

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...

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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

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