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Method for efficiently enriching platinum and palladium from low-concentration platinum-palladium nitric acid system solution

A low-concentration, platinum-palladium technology, applied in the direction of improving process efficiency, can solve the problems of small sediment particles, incomplete recovery, and difficulty in enriching platinum-palladium, achieving high filtration rate, improved filtration efficiency, and good precipitation effect Effect

Active Publication Date: 2020-10-30
WESTERN MINING CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a product with high-efficiency enrichment of platinum and palladium for the problems of low concentration of platinum and palladium, incomplete recovery, high impurity content, difficulty in enriching platinum and palladium, small precipitate particles, and slow filtration. A method for efficiently enriching platinum and palladium from a low-concentration platinum-palladium nitric acid system solution with high purity and short recovery operation period

Method used

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  • Method for efficiently enriching platinum and palladium from low-concentration platinum-palladium nitric acid system solution
  • Method for efficiently enriching platinum and palladium from low-concentration platinum-palladium nitric acid system solution
  • Method for efficiently enriching platinum and palladium from low-concentration platinum-palladium nitric acid system solution

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Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1, configuration contains platinum 0.014g / L, and the total 50L of low concentration platinum palladium nitric acid system solution containing palladium 0.03g / L is carried out according to the following steps,

[0040] 1) Put the low-platinum palladium nitric acid system solution into a 100L reaction kettle, adjust the pH to 0.7-1.5, add complexing agent A and start stirring, react at room temperature for 30-40min, then raise the temperature to 70-80°C, react for 60 -90min; then add regulator B, react for 10-20min, and filter after the reaction to obtain a platinum-palladium complex precipitate; wherein, the composition of complexing agent A is: wt85%-95% dimethylglyoxalxime and wt5%-15% of 2,4-pentanedionedioxime; the main component of regulator B is polyacrylamide, its concentration is 0.1-0.15%, and the dosage is 2-3% of the total solution;

[0041]2), washing the complex precipitate obtained in step 1) until the solution is neutral, and filtering and dryin...

Embodiment 2

[0055] Embodiment 2, configuration contains platinum 0.15g / L, and the total 50L of the low-concentration platinum palladium nitric acid system solution containing palladium 0.47g / L is carried out according to the following steps,

[0056] 1) Put the low-platinum palladium nitric acid system solution into a 100L reaction kettle, adjust the pH to 0.7-1.5, add complexing agent A and start stirring, react at room temperature for 30-40min, then raise the temperature to 70-80°C, react for 60 -90min; then add regulator B, react for 10-20min, and filter after the reaction to obtain a platinum-palladium complex precipitate; wherein, the composition of complexing agent A is: wt85%-95% dimethylglyoxalxime and wt5%-15% of 2,4-pentanedionedioxime; the main component of regulator B is polyacrylamide, its concentration is 0.1-0.15%, and the dosage is 2-3% of the total solution;

[0057] 2), washing the complex precipitate obtained in step 1) until the solution is neutral, and filtering and d...

Embodiment 3

[0072] Embodiment 3, configuration contains platinum 0.25g / L, and the low concentration platinum palladium nitric acid system solution containing palladium 0.73g / L is totally 30L, carries out according to the following steps,

[0073] 1) Put the low-platinum palladium nitric acid system solution into a 50L reaction kettle, adjust the pH to 0.7-1.5, add complexing agent A and start stirring, react at room temperature for 30-40min, then heat up to 70-80°C, react for 60 -90min, then add regulator B, react for 10-20min, filter after the reaction, and obtain platinum-palladium complex precipitate; the composition of complexing agent A is: wt85%-95% of dimethylglyoxal oxime and wt5 %-15% of 2,4-pentanedionedioxime; the main component of regulator B is polyacrylamide, its concentration is 0.1-0.15%, and the dosage is 2-3% of the total solution;

[0074] 2), washing the complex precipitate obtained in step 1) until the solution is neutral, and filtering and drying the precipitate;

...

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Abstract

The invention discloses a method for efficiently enriching platinum and palladium from a low-concentration platinum-palladium nitric acid system solution. The method comprises the steps of adjusting the pH value of the nitric acid system solution, adding a complexing agent A, carrying out two-stage temperature control reaction, then adding an adjusting agent B, obtaining a platinum-palladium complex precipitate after the reaction is finished, calcining the precipitate to remove organic matters to obtain platinum-palladium concentrate, separating platinum and palladium by adopting nitric acid leaching, nitrate removal and filtering, adding NH4Cl and KClO3 into a filtrate to obtain a red precipitate, adding ammonia water into the red precipitate, carrying out dissolving and filtering, addingHCl to obtain a yellow precipitate, dissolving the yellow precipitate with ammonia water, adding a reducing agent to obtain sponge palladium, dissolving platinum concentrate with aqua regia, adding NH4Cl into the filtered solution to obtain a precipitate, and slurrying and reducing the precipitate to obtain crude platinum powder. The method solves the problems of incomplete recovery, high impurity content, difficulty in enrichment of platinum and palladium, small obtained precipitate particles, slow filtration and the like existing when the platinum and palladium concentration is low, and hasthe advantages of high-efficiency enrichment of platinum and palladium, high product purity, high recovery efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of comprehensive recovery of precious metals, in particular to a method for efficiently enriching platinum and palladium from a low-concentration platinum-palladium nitric acid system solution. Background technique [0002] Platinum palladium noble metal has strong catalytic activity, and is an indispensable catalytic material for industrial waste gas purification, petrochemical industry, fine chemical industry, fuel cell manufacturing, organic chemical industry, etc. The industry prospect is very broad. my country has always been the world's largest consumer of platinum group metals, but at present, domestic platinum group metal resources are seriously scarce and its deposit types are complex, and the situation that a large amount of platinum group metals need to be imported needs to be improved urgently. The main raw materials for platinum and palladium recovery are copper anode slime, lead anode slime, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/006C22B7/007C22B7/008C22B11/042Y02P10/20
Inventor 刘远李耀山李金琼孔德鸿王铧泰王训青
Owner WESTERN MINING CO LTD
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