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Method for separating and recovering iridium and rhenium from iridium and rhenium waste

A technology for separation and recovery of waste materials, which is applied in the direction of chemical instruments and methods, rhenium compounds, and improvement of process efficiency. It can solve the problems of large consumption of chemical reagents, complicated follow-up processes, and high equipment requirements, and achieve low equipment corrosion and low investment. Low cost and reduced dispersion loss

Active Publication Date: 2021-04-30
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods all require high-temperature treatment or alkali fusion, which requires high equipment, and high-temperature treatment will cause the loss of iridium, the follow-up process is complicated, the consumption of chemical reagents is large, and the investment in equipment is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for separating and recovering iridium-rhenium from iridium-rhenium waste, comprising the following steps:

[0038] (1) Weigh 500 g of 100-mesh iridium-rhenium target material waste, put it into a tube furnace and heat it to 600 ° C, slowly introduce chlorine gas to react at 600 ° C, and use pure water to absorb the tail gas to obtain an absorption liquid;

[0039] (2) Add the remaining powder in the tube furnace to hydrochloric acid with a mass concentration of 35%, feed chlorine gas at 90° C. for oxidative dissolution, and the dissolution time is 8 hours. Add ammonium chloride to the resulting liquid (ie leachate) for precipitation, and collect Precipitate and wash with dilute ammonium chloride solution to obtain ammonium chloroiridate with a purity of 99.95%, and the iridium recovery rate is 95.8%;

[0040] (3) Add ammonia water to the absorption liquid obtained in step (1) to generate ammonium rhenate, then concentrate and crystalliz...

Embodiment 2

[0042] This embodiment provides a method for separating and recovering iridium-rhenium from iridium-rhenium waste, comprising the following steps:

[0043] (1) Weigh 500g of 100-mesh iridium-rhenium target material waste, put it into a tube furnace and heat it to 700°C, slowly introduce chlorine gas to react at 700°C, use potassium hydroxide solution to absorb the tail gas, and obtain a precipitate containing potassium rhenate the absorption liquid;

[0044] (2) Add the remaining powder in the tube furnace to a sodium chloride solution with a mass concentration of 35%, and then add nitric acid to oxidize and dissolve at 92°C. The dissolution time is 12 hours, and add ammonium chloride to the obtained liquid (ie, leachate) Precipitate, collect the precipitate and wash with ammonium chloride dilute solution to obtain ammonium chloroiridate with a purity of 99.99%, and the iridium recovery rate is 96%;

[0045] (3) Concentrate and crystallize the absorption solution containing p...

Embodiment 3

[0047] This embodiment provides a method for separating and recovering iridium-rhenium from iridium-rhenium waste, comprising the following steps:

[0048](1) Weigh 500 g of 200-mesh iridium-rhenium target material waste, put it into a tube furnace and heat it to 800 ° C, slowly introduce chlorine gas to react at 800 ° C, and use pure water to absorb the tail gas to obtain an absorption liquid;

[0049] (2) Add the remaining powder in the tube furnace to the potassium chloride solution with a mass concentration of 35%, pass through chlorine gas at 95°C for oxidation and dissolution, and the dissolution time is 10h, and add ammonium chloride to the obtained liquid (ie, leachate) Precipitation, collecting the precipitate and washing it with a dilute ammonium chloride solution to obtain ammonium chloroiridate with a purity of 99.99%, and the recovery rate of iridium is 96%;

[0050] (3) Add ammonia water to the absorption liquid obtained in step (1) to generate ammonium rhenate, ...

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PUM

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Abstract

The invention provides a method for separating and recovering iridium and rhenium from iridium and rhenium waste, and belongs to the field of rare and precious metal separation and recovery. The method comprises the following steps: carrying out heating reaction on the iridium-rhenium waste and oxidizing gas to separate iridium from rhenium; absorbing tail gas by using water or an alkaline solution; purifying to recover rhenium; dissolving residual solid metal after the heating reaction with an acid solution in the presence of an oxidizing agent; then adding a precipitator for precipitation; and collecting precipitates to realize iridium recovery. According to the method, a repeated roasting and leaching process is not adopted for purification; the dispersion loss of precious metal iridium is reduced; meanwhile, the equipment corrosion is small; the investment cost is low; the process is short; the iridium recovery rate can reach 95.8% or above; the purity of the obtained iridium salt reaches 99.95% or above; and the purity of the obtained rhenium salt reaches 99.9% or above.

Description

technical field [0001] The invention belongs to the field of separation and recovery of rare metals, in particular to a method for separating and recovering iridium-rhenium from iridium-rhenium waste. Background technique [0002] Iridium and its alloys are mainly used as catalysts in the petrochemical industry, and are mainly used in the manufacture of resistance wires, thermocouples, iridium cathode wires, relays, electrical contacts and printed circuits in the electronic and electrical industries. High-hardness iridium-platinum alloys are often used to manufacture gyroscope conductive rings, pen tips, watches, instrument bearings, etc. Iridium can also be used to prepare high-temperature reaction crucibles. At present, in the industry, the methods for recovering iridium from solid waste are as follows: firstly process iridium-containing materials by induction smelting, incineration, roasting, microwave, reduction, metal fragmentation, etc., then undergo alkali fusion and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/06C01G47/00C01G55/00C01C1/16
CPCC22B7/006C22B11/046C22B11/06C01G47/00C01G55/002C01C1/164Y02P10/20
Inventor 行卫东朱刘
Owner FIRST RARE MATERIALS CO LTD