The method for extracting iridium from alkaline cyanide solution by 2-ethylhexyltributylphosphine bromide

A technology of hexyltributylphosphine bromide and ethyl bromide, which is applied in the field of precious metal hydrometallurgy, can solve problems that have not been reported in the literature, and achieve the effects of short extraction cycle, stable performance and low cost

Inactive Publication Date: 2021-06-04
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • The method for extracting iridium from alkaline cyanide solution by 2-ethylhexyltributylphosphine bromide
  • The method for extracting iridium from alkaline cyanide solution by 2-ethylhexyltributylphosphine bromide
  • The method for extracting iridium from alkaline cyanide solution by 2-ethylhexyltributylphosphine 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. The organic phase was prepared, wherein the total volume of the organic phase was 40 mL, the organic phase contained 6 mL of trioctylphosphine oxide (TOPO), the remainder was diluent with cyclohexane, and the concentration of ETPPB in the organic phase was 0.02 mol / 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 / ...

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 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 according to the ratio between the organic phase and the aqueous phase (O / A=1:1) for bac...

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Abstract

The method for extracting iridium from alkaline cyanide solution by 2-ethylhexyl tributylphosphine bromide relates to the process of extracting iridium from alkaline cyanide solution. Includes regulation of Ir(CN) 6 3‑ The pH of the feed solution is 9.0-11.0 as the water phase of the extraction system; 2-ethylhexyltributylphosphine bromide is used as the extractant, trioctylphosphine oxide or trialkylphosphine oxide or tributyl phosphate or diiso One of octyl sulfoxide is co-extractant, and one of chloroform or cyclohexane or sulfonated kerosene is used as diluent, and the concentration of 2‑ethylhexyltributylphosphine bromide in the organic phase is 0.02~0.05 mol / L; miscible, static stratification will Ir (CN) 6 3‑ Transfer from the aqueous phase to the organic phase, and back-extract iridium with 0.2-0.6 mol / L NaBr solution. The solvent system of the invention has high saturated extraction capacity, easy stripping, short extraction cycle, the stripping system can be recycled without regeneration treatment, the recovery rate is greater than 96% after 4 cycles, the cost is low, and it has the prospect of popularization and application.

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 Patents(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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