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New method for hydrogen reduction separating rhodium in iridium solution

A new method and solution technology, applied in the field of extraction and separation of platinum group metals, can solve the problems of autoclave danger, inability to solve hydrogen corrosion, complicated operation, etc., and achieve the effect of complete separation, prominent substantive characteristics, and short reaction process

Inactive Publication Date: 2005-06-15
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a method of separating rhodium and iridium by hydrogen reduction under normal pressure, which can overcome the danger of autoclave and complicated operation in the method of purifying iridium by pressurized hydrogen reduction, and the problem of hydrogen corrosion cannot be solved under high pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The chloroiridic acid (38g / l) stock solution of the chlororhodium acid (45.5g / l) of 0.44ml and 2.6ml is made into containing rhodium 0.1g / l, the solution 200ml of iridium 1.5g / l in volumetric flask. Its acidity is pH=1. After transferring the prepared rhodium-iridium solution into a self-made glass reactor, start to stir and heat up. The stirring speed is 600 rpm. Adjust to 200 ml / min, start timing, after the reaction reaches 2 hours, turn off hydrogen and feed nitrogen at the same time, remove excess hydrogen in the reactor, take 10 ml of solution and filter it into a dry volumetric flask, analyze the concentration of metal rhodium in the filtrate , As a result, rhodium in the solution is 0.0005g / l. The reduction rate is 99.5%.

Embodiment 2

[0012] Get 0.44ml of chlororhodium acid (45.5g / l) and 7.9ml of chloroiridic acid (38g / l) stock solution to be made into containing rhodium 0.1g / l, the solution 200ml that contains iridium 1.5g / l in volumetric flask. Its acidity is pH=1. After transferring the prepared rhodium-iridium solution into a self-made glass reactor, start to stir and heat up. The stirring speed is 600 rpm. Adjust to 400 ml / min, start timing, after the reaction reaches 2 hours, turn off the hydrogen and feed nitrogen at the same time to remove excess hydrogen in the reactor, take 10 ml of the solution and filter it into a dry volumetric flask, and analyze the concentration of metal rhodium in the filtrate , As a result, rhodium in the solution is 0.00036g / l. The reduction rate was 99.64%.

Embodiment 3

[0014] Get 0.33ml of chlororhodium acid (45.5g / l) and 7.9ml of chloroiridic acid (38g / l) stock solution to be made into containing rhodium 0.075g / l, the solution 200ml that contains iridium 1.5g / l in volumetric flask. Its acidity is pH=1. After transferring the prepared rhodium-iridium solution into a self-made glass reactor, start to stir and heat up. The stirring speed is 600 rpm. Adjust to 200 ml / min, start timing, after the reaction reaches 2 hours, turn off hydrogen and feed nitrogen at the same time, remove excess hydrogen in the reactor, take 10 ml of solution and filter it into a dry volumetric flask, analyze the concentration of metal rhodium in the filtrate , As a result, rhodium in the solution is 0.00046g / l. The reduction rate was 99.4%.

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PUM

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Abstract

A hydrogen reducing process for separating Rh from Ir solution includes loading the Rh contanied Ir solution into reactor, heating to a certain temp udner ordinary pressure, introducing H2 to it, and hydrogen reducing reaction to reduce Rh into solid metal. Its advantages are high purity (99% for Rh and 99.99% for Ir), short time, and no pollution.

Description

technical field [0001] The invention relates to the extraction and separation of platinum group metals, in particular to a method for the separation and extraction of rhodium and iridium in platinum group metals. Background technique [0002] In the metallurgical process of precious metals, due to the similar chemical properties of rhodium and iridium, their existence state in hydrochloric acid medium is very complicated. Therefore, the separation of rhodium and iridium is a recognized problem in analysis and refining and purification, and it has also been studied for many years. topic. Generally speaking, the separation of rhodium and iridium is carried out after the separation of other metal substrates. [0003] The general situation of research on the separation of rhodium and iridium has been reviewed. In years of research, chemists have proposed various separation methods for the determination of rhodium and iridium, some of which have been adopted by metallurgists. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26C22B3/44C22B11/00
CPCY02P10/20
Inventor 关晓伟
Owner SINO PLATINUM METALS CO LTD
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