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A kind of method that reclaims iridium, rhodium from iridium-rhodium alloy scrap

A technology of iridium-rhodium alloy and scrap, applied in the direction of improving process efficiency, etc., can solve the problems of high cost, lengthy process flow, poor separation effect and the like

Active Publication Date: 2021-04-20
XIAN RAREALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dissolving of iridium-rhodium alloy waste mainly adopts the following methods: (1) medium temperature chlorination method: logical chlorine chlorination after iridium-rhodium waste or crude metal is mixed with sodium chloride, then leaching with dilute hydrochloric acid makes iridium-rhodium go into the solution, but This method cannot handle iridium-rhodium alloy materials with complex composition
(2) Metal activation method: materials containing iridium and rhodium are melted with zinc, aluminum, tin, etc. at high temperature to form an alloy, then the base metal is leached out with dilute hydrochloric acid, and the filter residue is dissolved with aqua regia after leaching so that the iridium and rhodium are converted into the solution. The melt activation process of the method needs to use intermediate frequency furnace equipment, and the cost is expensive; (3) bisulfate fusion method: utilize rhodium melting to form soluble sulfate and iridium separation, and this technology iridium rhodium separation is not thorough; (4) alkali dissolution method: the The iridium rhodium of the method goes into the solution and the conversion rate is very low
These methods all have the shortcomings of poor iridium and rhodium separation effect, low recovery rate and lengthy technical process.

Method used

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  • A kind of method that reclaims iridium, rhodium from iridium-rhodium alloy scrap

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, this embodiment includes the following steps:

[0022] Step 1, after mixing 100g of iridium-rhodium alloy waste and 300g of alumina, put it into the aluminum electrolytic cell of the electrolysis device as an electrolyte, then melt and electrolyze it for 10 hours at a temperature of 900° C. to obtain highly active iridium-rhodium alloy waste; The anode current density is controlled to be 0.5A / cm in the process of molten electrolysis 2 ;

[0023] Step 2, adding a hydrochloric acid solution with a mass concentration of 5% to the highly active iridium-rhodium alloy waste obtained in step 1, performing leaching treatment at a temperature of 80°C, and then filtering, collecting and washing the filter residue;

[0024] Step 3, put the washed filter residue in step 2 into a titanium autoclave, then add a hydrochloric acid solution with a mass concentration of 35% and feed in chlorine gas, dissolve and react for 3 hours at a temperature of 90°C and ...

Embodiment 2

[0028] Such as figure 1 As shown, this embodiment includes the following steps:

[0029] Step 1, after mixing 500g of iridium-rhodium alloy scrap and 1500g of alumina, put it into the aluminum electrolytic cell of the electrolysis device as electrolyte, then melt and electrolyze it for 20h at a temperature of 950°C to obtain highly active iridium-rhodium alloy scrap; In the process of molten electrolysis, the anode current density is controlled to be 1A / cm 2 ;

[0030] Step 2, adding a hydrochloric acid solution with a mass concentration of 5% to the highly active iridium-rhodium alloy waste obtained in step 1, performing leaching treatment at a temperature of 85°C, and then filtering, collecting and washing the filter residue;

[0031] Step 3, put the washed filter residue in step 2 into a titanium autoclave, then add a hydrochloric acid solution with a mass concentration of 35% and feed chlorine gas, and dissolve and react for 4 hours at a temperature of 100°C and a pressu...

Embodiment 3

[0035] Such as figure 1 As shown, this embodiment includes the following steps:

[0036] Step 1, mix 1000g of iridium-rhodium alloy waste and 3000g of alumina and put it into the aluminum electrolytic cell of the electrolysis device as electrolyte, then melt and electrolyze it for 50h at a temperature of 1000°C to obtain highly active iridium-rhodium alloy waste; The anode current density is controlled to be 1.5A / cm in the process of molten electrolysis 2 ;

[0037] Step 2, adding a hydrochloric acid solution with a mass concentration of 5% to the highly active iridium-rhodium alloy waste obtained in step 1, performing leaching treatment at a temperature of 90°C, and then filtering, collecting and washing the filter residue;

[0038] Step 3, put the washed filter residue in step 2 into a titanium autoclave, then add a hydrochloric acid solution with a mass concentration of 35% and feed chlorine gas, and dissolve and react for 5 hours at a temperature of 150° C. and a pressur...

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Abstract

The invention discloses a method for recovering iridium and rhodium from iridium-rhodium alloy waste. The method comprises: 1. mixing the iridium-rhodium alloy waste with alumina and then carrying out melting electrolysis to obtain highly active iridium-rhodium alloy waste; 2. Adding hydrochloric acid solution to the high-activity iridium-rhodium alloy waste material for leaching, then filtering and collecting the filter residue and washing; step 3, adding hydrochloric acid to the filter residue and introducing chlorine gas for dissolution, and then introducing hydrogen sulfide gas for reduction reaction to obtain slurry; Step 4, feed chlorine gas into the filtrate obtained after filtering the slurry, and carry out evaporation and concentration, and obtain chloroiridic acid solution and rhodium sulfide slag through filtration. The invention adopts molten electrolysis method to activate the iridium-rhodium alloy waste material doped with alumina, and the melted solution of alumina melt penetrates and corrodes the iridium-rhodium alloy, thereby improving the activation performance of the iridium-rhodium alloy, thereby improving the solution conversion rate of iridium-rhodium, The recovery rate of iridium and rhodium in the subsequent treatment is further improved, and there is no need to use expensive intermediate frequency furnace equipment in the activation process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for recovering iridium and rhodium from iridium-rhodium alloy waste. Background technique [0002] Iridium is a rare element that exists in the earth's crust. The chemical properties of iridium are very stable and it is the most corrosion-resistant metal. The chemical stability of iridium to acids is extremely high. Only spongy iridium can slowly dissolve in heat In water, if it is iridium in a dense state, even boiling aqua regia cannot be corroded; rhodium is a silver-white, hard metal with high reflectivity, rhodium metal usually does not form oxides, even when heated, Atmospheric oxygen is only absorbed by rhodium heated to its melting point, but released during solidification. Rhodium is insoluble in most acids, it is completely insoluble in nitric acid, and slightly soluble in aqua regia. Iridium-rhodium alloys are mainly used as high-temperature anti-oxidation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34C22B11/00C22B7/00
CPCC22B11/046C25C3/34Y02P10/20
Inventor 周严郭瑞陈兴飞王靖坤
Owner XIAN RAREALLOYS
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