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Method for extracting iridium from alkaline cyanide solution by using 2-ethylhexyl tributyl phosphonium bromide

A technology of hexyltributylphosphine bromide and ethyl group, applied in the field of precious metal hydrometallurgy, can solve problems such as no literature reports, and achieve the effects of short extraction cycle, fast kinetic speed and low cost

Inactive Publication Date: 2020-02-21
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkyl quaternary phosphine ionic liquids have been widely used in the extraction and separation of platinum group metal ions due to their advantages of low volatility, stable properties and good solubility. Most of the alkyl quaternary phosphine ionic liquid extraction systems reported in the literature are limited to acidic media. 2-ethylhexyltributylphosphine bromide (ETPPB for short) used in the present invention is a branched alkyl quaternary phosphine ionic liquid, and ETPPB is used as an extraction agent for iridium in alkaline cyanide solution medium The extraction has not been reported in the literature

Method used

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  • Method for extracting iridium from alkaline cyanide solution by using 2-ethylhexyl tributyl phosphonium bromide
  • Method for extracting iridium from alkaline cyanide solution by using 2-ethylhexyl tributyl phosphonium bromide
  • Method for extracting iridium from alkaline cyanide solution by using 2-ethylhexyl tributyl phosphonium bromide

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Experimental program
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Effect test

Embodiment 1

[0033] Get the Ir(CN) whose Ir(III) concentration is 51.2mg / L 6 3- 90 mL of the solution was placed in a separatory funnel, and the pH value of the solution was adjusted to 9.0 as the aqueous phase of the extraction system. The organic phase was prepared, wherein the total volume of the organic phase was 30 mL, the organic phase contained 3 mL of diisooctyl sulfoxide (DIOSO), the balance was chloroform as a diluent, and the concentration of ETPPB in the organic phase was 0.02 mol / L. Add the organic phase to the water phase (O / A=1:3), mechanically oscillate for 2 minutes and let it stand for stratification. After phase separation, measure the concentration of iridium in the water phase, and obtain the iridium concentration in the organic phase by subtraction. Take the organic phase loaded with iridium, put it into another separatory funnel, add NaBr with a concentration of 0.2mol / L according to the ratio between the organic phase and the aqueous phase (O / A=3:1) for back extrac...

Embodiment 2

[0035] Get the Ir(CN) whose Ir(III) concentration is 75.3mg / L 6 3- 80 mL of the solution was placed in a separatory funnel, and the pH value of the solution was adjusted to 9.5 as the aqueous phase of the extraction system. Prepare the organic phase, wherein the total volume of the organic phase is 40mL, the organic phase contains 6mL trioctylphosphine oxide (TOPO), the balance is diluent with cyclohexane, and the concentration of ETPPB in the organic phase is 0.02mol / L. The organic phase was added to the water phase (O / A=1:2), mechanically oscillated for 4 minutes and allowed to stand for stratification. After phase separation, the concentration of iridium in the water phase was measured, and the concentration of iridium in the organic phase was obtained by subtraction. Take the organic phase loaded with iridium, put it into another separatory funnel, add NaBr at a concentration of 0.3mol / L according to the ratio of the organic phase to the aqueous phase (O / A=2:1) ​​for back...

Embodiment 3

[0037] Get the Ir(CN) whose Ir(III) concentration is 101.2mg / L 6 3-50 mL of the solution was placed in a separatory funnel, and the pH value of the solution was adjusted to 10.0 as the aqueous phase of the extraction system. The organic phase was prepared, wherein the total volume of the organic phase was 50 mL, the organic phase contained 10 mL of trialkylphosphine oxide (TRPO), the balance was sulfonated kerosene as a diluent, and the concentration of ETPPB in the organic phase was 0.03 mol / L. The organic phase was added to the water phase (O / A=1:1), mechanically oscillated for 5 minutes and allowed to stand for stratification. After phase separation, the concentration of iridium in the water phase was measured, and the concentration of iridium in the organic phase was obtained by subtraction. Take the organic phase loaded with iridium, put it into another separatory funnel, add 0.4mol / L NaBr for stripping according to the ratio between the organic phase and the aqueous pha...

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Abstract

The invention discloses a method for extracting iridium from alkaline cyanide solution by using 2-ethylhexyl tributyl phosphonium bromide, and relates to a process for extracting iridium from alkalinecyanide solution. The method comprises the following steps of: adjusting the pH value of Ir (CN)63-feed liquid to 9.0-11.0 to serve as a water phase of an extraction system; taking 2-ethylhexyl tributyl phosphonium bromide as an extracting agent, taking one of trioctyl phosphine oxide, trialkyl phosphine oxide, tributyl phosphate or diisooctyl sulfoxide as a synergistic extracting agent, and taking one of chloroform, cyclohexane or sulfonated kerosene as a diluent, wherein the concentration of the 2-ethylhexyl tributyl phosphonium bromide in an organic phase is 0.02 to 0.05 mol / L; and mixingthe phases, standing and layering to transfer Ir (CN)6<3-> from the water phase to the organic phase, and performing back extraction on iridium and the like by using 0.2 to 0.6 mol / L NaBr solution. The solvent system has high saturated extraction capacity, easy back extraction and short extraction period; the back extraction system can be recycled without regeneration treatment; the recovery rateis more than 96 percent after four times of recycling; and the method has low cost and popularization and application prospect.

Description

technical field [0001] The invention belongs to precious metal hydrometallurgy, in particular to a process for extracting iridium from alkaline cyanide solution. Background technique [0002] Platinum group metals are extremely scarce metal resources in my country. Platinum group metal iridium is widely used in chemical, aerospace and communication industries due to its excellent thermoelectric transmission and high temperature oxidation resistance. Two important channels for obtaining iridium are platinum group metal mining and iridium alloy secondary resource recovery. The pressurized cyanide leaching process is a valuable metal extraction technology that has been widely used in hydrometallurgy. In recent years, with the large-scale application of this process technology in platinum group metallurgy, many iridium-containing alkaline cyanide The leachate needs to be refined, but for the separation and extraction of iridium in the alkaline cyanide solution medium, an effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B11/00
CPCC22B11/04C22B3/38Y02P10/20
Inventor 黄章杰陈慕涵金次邵敏范梅罗国婷叶群葛云松陈明军
Owner YUNNAN UNIV
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