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Novel process for separating rhodium and iridium

A new process, rhodium-iridium technology, applied in the field of rhodium-iridium slag, can solve problems such as difficulties, increase in production, automatic control of unfavorable equipment, etc., and achieve the effect of shortening the production cycle and improving separation efficiency

Active Publication Date: 2017-01-04
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rhodium-iridium replacement slag is acid leached → P204 extracts base metals → hydrolyzes platinum → rhodium-iridium hydrolysis slag, the rhodium-iridium content and purity in the slag are relatively high, and TBP (tributyl phosphate) is generally used to separate rhodium-iridium in existing production. However, there are the following problems in actual production: (1) TBP has corrosion and swelling effects on common materials such as plexiglass, polyvinyl chloride (PVC), reinforced polyvinyl chloride (UPVC), and high acidity and other strong corrosion effects. It is difficult to select suitable equipment materials in practical applications; (2) The three-stage extraction of iridium (Ⅳ) by TBP is an intermittent operation, and an oxidant must be added to the feed liquid before each operation to ensure that most of the iridium (Ⅲ) is converted into iridium ( Ⅳ) is extracted, this process is unfavorable for the promotion of automatic control of equipment and output; Therefore, it is necessary to develop a chemical precipitation method for rapidly separating rhodium iridium

Method used

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  • Novel process for separating rhodium and iridium
  • Novel process for separating rhodium and iridium

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Introduce chlorine gas into the rhodium-iridium-containing solution to control the potential at 950mV, stop the chlorine gas flow, then add 35% liquid caustic soda to control the pH value of the feed solution between 11, and stop the chlorine flow to reduce the pH to 8.5. After repeating the above process three times , transfer the rhodium iridium into the slag; add hydrochloric acid to dissolve the rhodium iridium slag, control the acidity at 4mol / L, and control the potential of the feed liquid at 920mV by adding a strong oxidant; raise the temperature to 70°C, add reagent DETA to precipitate rhodium according to 2 times the theoretical amount , control the temperature at 70-75°C, keep the temperature constant for half an hour, cool and filter. The precipitation rate of rhodium in the whole process is 99.85%.

[0021] Table 1 Changes of solution components before and after precipitation in Example 1 (g / L)

[0022]

Embodiment 2

[0024] Introduce chlorine gas into the solution containing rhodium and iridium to control the potential at 940mV, stop passing chlorine gas, then add 40% liquid caustic soda to control the pH value of the feed liquid between 12, pass chlorine to reduce pH=9 and stop, repeat the above process three times , transfer the rhodium iridium into the slag; add hydrochloric acid to dissolve the rhodium iridium slag, control the acidity at 5mol / L, and control the potential of the feed liquid at 935mV by adding a strong oxidant; raise the temperature to 70°C, add reagent DETA to precipitate rhodium according to 2 times the theoretical amount , control the temperature at 70-75°C, keep the temperature constant for half an hour, cool and filter. The precipitation rate of rhodium in the whole process was 99.87%.

[0025] Table 2 Changes of solution components before and after precipitation in Example 2 (g / L)

[0026]

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Abstract

The invention discloses a novel process for separating rhodium and iridium. The novel process includes the steps that (1) a strong oxidant is added into a solution containing rhodium and iridium to control the potential, and precious metal ions in the solution are converted into the high valence state; (2) the pH value of feed liquid is controlled through adding of liquid caustic soda, chlorine is introduced till the pH value is lowered to 8-9, and rhodium and iridium are transferred into slag after the procedure is repeated three times; and (3) the rhodium and iridium slag is dissolved through added hydrochloric acid, the acidity is controlled, the potential of the feed liquid is controlled to 900-950 mV by adding the strong oxidant, the temperature is controlled, and rhodium is settled by adding a reagent DETA. The novel process has the beneficial effects that 1, the rhodium and iridium separating efficiency is improved, and the rhodium settling rate is 99% or over; and 2, compared with a TBP rhodium and iridium separating process, the production cycle is shortened by 60% through the novel process.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and relates to a new process for separating rhodium and iridium, which can be used for hydrolyzed slag containing rhodium and iridium, and can also be used for rhodium and iridium slag containing other impurities. Background technique [0002] The general treatment process of platinum-group metal-rich materials is as follows: After slurrying platinum-group metals with sulfuric acid, adding a strong oxidant, osmium and ruthenium are evaporated and absorbed by gas through distillation, and the remaining precious metals are completely transferred to separated in solution. Due to the high redox potential of gold, it is easy to be reduced in the solution and cause loss. Therefore, the gold is separated first, and then the precipitation of platinum and palladium is realized by adding a reducing agent to control the potential. Rhodium and iridium are transferred to the slag through the...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B11/00
CPCC22B3/44C22B11/04Y02P10/20
Inventor 王立潘从明黄虎军李进武谢振山曹杰义
Owner JINCHUAN GROUP LIMITED
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