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Liquid film extraction method for recovering copper and nickel in wastewater by using ionic liquid reinforced mass transfer

An ionic liquid and wastewater technology, applied in the direction of improving process efficiency, to achieve the effect of speeding up the transmission rate and improving the extraction efficiency

Inactive Publication Date: 2016-05-25
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

However, the extraction of metal ions is mostly limited to the extraction of a single metal ion, especially the research and technology of step-by-step liquid membrane extraction and recovery of two metal ions, copper and nickel, have not been reported.

Method used

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  • Liquid film extraction method for recovering copper and nickel in wastewater by using ionic liquid reinforced mass transfer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This implementation example adopts emulsion liquid membrane extraction technology to separate and reclaim the copper-nickel ion in the waste water, when the copper extraction agent P507 is 5% (v / v), the inner aqueous phase H 2 SO 4 Concentration 3.0mol / L, surfactant Span805.0% (v / v), [C 4 mim]Cl is 0.03% (v / v), liquid paraffin is 1% (v / v), and when the oil-to-inner ratio is 1:1, the extraction efficiency of the emulsion liquid film to copper ions is 98.73%, and the nickel extraction rate is only 3%, the separation effect on copper and nickel is better.

Embodiment 2

[0025] This implementation example adopts emulsion liquid membrane extraction technology to separate and recover the remaining nickel ions in the waste water, when the nickel extractant TBP is 4% (v / v), the inner aqueous phase NaOH concentration is 0.5mol / L, and the surfactant Span805.0% (v / v), liquid paraffin 1% (v / v), [C 4 mim][PF 6 ] was 0.03% (v / v), and when the oil-to-inner ratio was 1:1, the extraction rate of the emulsion liquid film to nickel ions was 99.03%.

Embodiment 3

[0027] This implementation example adopts emulsion liquid membrane extraction technology to separate and reclaim the copper-nickel ion in the waste water, when the copper extraction agent P507 is 5% (v / v), the inner aqueous phase H 2 SO 4 The concentration is 3.0mol / L; the nickel extractant TBP is 4% (v / v), the inner aqueous phase NaOH concentration is 0.5mol / L, the surfactant Span80 is 5.0% (v / v), and the liquid paraffin is 1% (v / v ), the oil-to-oil ratio is 1:1, the milking speed is 3500r / min, the milking time is 10min, the ratio is 1:3, the extraction speed is 300r / min, and the extraction time is 10min. When no ionic liquid is added, copper extraction The rate is 93.2%, and the nickel extraction rate is 92.8%.

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Abstract

The invention provides a liquid film extraction method for recovering copper and nickel in wastewater by using ionic liquid reinforced mass transfer. P507 and TBP are respectively used as copper and nickel ion extractants, sulfuric acid and sodium hydroxide are used as stripping agents, proper amounts of film aid and film solvent are added, a proper ionic liquid is used as a reinforced mass transfer medium, and a proportionally prepared raw material solution is stirred at high speed to obtain an emulsion film extractant. By utilizing the salting-out effect and hydration characteristic of the ionic liquid, the ionic liquid is matched with the organic extractant, and neutral compounding, anion / cation-exchange and other modes are utilized to increase the formation and transmission rates of the metal ion complex, thereby enhancing the extraction efficiency. The corresponding extractant and ionic liquid can be selected according to different substances in need of extraction separation so as to carry out extraction treatment on wastewater containing other metal ions, textile and dye printing wastewater, and other types of biological nondegradable organic wastewater.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a liquid membrane extraction method for recovering copper and nickel in wastewater by using ionic liquids to enhance mass transfer. Background technique [0002] As a metal material commonly used in industrial production, copper nickel is widely used in various industries. Due to the similar physical and chemical properties of copper and nickel, the two metals are often associated in the ore, and the wastewater produced by the hydrometallurgy process often contains copper and nickel metal ions at the same time. Copper and nickel ions are toxic heavy metal ions, and a large amount of them will pollute the environment and endanger human health. [0003] At present, the main treatment methods for wastewater containing heavy metal ions include chemical precipitation, adsorption, membrane separation and solvent extraction. Precipitation method will produce a large amou...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B15/00C22B3/26
CPCC22B7/00C22B3/26Y02P10/20
Inventor 毕强薛娟琴唐长斌于丽花郭莹娟李国平张晓
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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