Method for separating iridium from base metal and other platinum family metals

A technology for platinum group metals and base metals, which is applied in the field of recovery, separation and purification of precious metals. It can solve the problems of difficult operation, low recovery rate of iridium, and large consumption of reagents, and achieve high recovery rate, low consumption of reagents and reduction of waste liquid. The effect produced

Inactive Publication Date: 2017-01-25
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts pressurized conditions, and the operation process is not easy to realize
[0008] At present, the refining, separation and purification technology of iridium has the disadvantages of cumbersome and complicated process, large consumption of reagents, and low recovery rate of iridium.

Method used

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  • Method for separating iridium from base metal and other platinum family metals

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Embodiment 1

[0029] A method for separating iridium from base metals and other platinum group metals, comprising the steps of:

[0030] (1) Hydrolysis of impurity removal: Slowly add 200 g of NaOH to 1000 ml of iridium solution containing a small amount of platinum, palladium, rhodium, ruthenium and base metal impurities such as Fe, Pb, Sn, Mg, Zn and stir at a speed of 60 r / min, stir for 20 min, adjust the pH value of the solution to 9.5, filter with a funnel and a suction filter bottle, and hydrolyze the base metal to form a hydroxide precipitate and remove it.

[0031] (2) Ion exchange: exchange the filtrate obtained by hydrolysis with cation resin three times to further remove base metal impurities to obtain a pure platinum group metal solution; the resin is a strong acid cation exchange resin with a flow rate of 200ml / min until the base metal The metal content is less than 0.0001g / L.

[0032] (3) Concentration: Concentrate the solution composed of iridium, platinum, palladium, rhodi...

Embodiment 2

[0037] A method for separating iridium from base metals and other platinum group metals, comprising the steps of:

[0038] (1) Hydrolysis of impurities: Slowly add 300 g of NaOH to 1500 ml of iridium solution containing a small amount of platinum, palladium, rhodium, ruthenium and base metal impurities such as Fe, Pb, Sn, Mg, Zn and stir at a speed of 70 r / min, stir for 30 min, adjust the pH value of the solution to 11, filter with a funnel and a suction filter bottle, so that the base metal is hydrolyzed to form a hydroxide precipitate and removed;

[0039] (2) Ion exchange: exchange the filtrate obtained by hydrolysis with cation resin for 5 times to further remove base metal impurities to obtain a pure platinum group metal solution; the resin is a strong acid cation exchange resin with a flow rate of 200ml / min until the base metal The metal content is less than 0.0001g / L.

[0040] (3) Concentration: Concentrate the solution composed of iridium, platinum, palladium, rhodiu...

Embodiment 3

[0045] A method for separating iridium from base metals and other platinum group metals, comprising the steps of:

[0046] (1) Hydrolysis of impurity removal: Slowly add 400 g of NaOH to 2000 ml of iridium solution containing a small amount of platinum, palladium, rhodium, ruthenium and base metal impurities such as Fe, Pb, Sn, Mg, Zn and stir at a stirring speed of 65 r / min , stirred for 25 minutes, adjusted the pH value of the solution to 10.5, filtered with a funnel and a suction filter bottle, and hydrolyzed the base metal to form a hydroxide precipitate to be removed;

[0047] (2) Ion exchange: exchange the filtrate obtained by hydrolysis with cation resin for 4 times to further remove base metal impurities to obtain a pure platinum group metal solution; the resin is a strong acid cation exchange resin with a flow rate of 200ml / min until the base metal The metal content is less than 0.0001g / L.

[0048] (3) Concentration: Concentrate the solution composed of iridium, plat...

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Abstract

The invention relates to a noble metal recycling, separating and purifying method, in particular to a method for separating iridium from a base metal and other platinum family metals. The method comprises the following steps: (1) hydrolysis for impurity removal; (2) ion exchange; (3) concentration; (4) electric deposition; (5) filtration; (6) settling of a pure iridium solution. The method has the following benefits that (1) the process is simple, no other impurities are introduced, the reagent consumption is low, generation of waste liquid is reduced, and environment friendliness is achieved; (2) separated and removed other platinum family metal impurities are enriched on a cathode plate and cannot be dispersed, so that recycling is facilitated; (3) specific steps of electrically depositing and separating the iridium from the other platinum family metals and optimal regions of all data are provided; (4) the recycling rate of the iridium is high. An iridium solution purified with the method is subjected to direct ammonia chloride settling, calcining and reduction, so that the purity of obtained sponge iridium is 99.95 percent or above.

Description

technical field [0001] The invention relates to a method for recovering, separating and purifying precious metals, in particular to a method for separating iridium from base metals and other platinum group metals. Background technique [0002] The refining of iridium usually adopts ion exchange method, replacement method, ammonium chloride repeated precipitation method and solvent extraction to remove base metal and other platinum group metal ions in iridium solution to obtain pure iridium solution. Then add oxidant (such as chlorine, nitric acid, H 2 o 2 etc.) to convert iridium into Ir(IV), and then add ammonium chloride to generate ammonium chloroiridate (NH 4 ) 2 IrCl 6 Precipitation, ammonium chloroiridate is calcined at high temperature, and hydrogen reduction is used to obtain pure metal iridium. [0003] Patent CN 1031805C discloses a method for separating and enriching rhodium, iridium, gold, platinum, and palladium in a solution, using copper powder to replace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/42C22B3/44C22B11/00C25C1/20
CPCC22B3/42C22B3/44C22B11/04C25C1/20Y02P10/20
Inventor 李红梅熊庆丰郭俊梅吴喜龙韩守礼贺小塘谭文进李勇赵金成赵雨王欢刘文
Owner GUIYAN RESOURCE YIMEN
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