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Method for extracting palladium sponge from silver electrolysis anode slime parting liquid

A technology of anode slime and palladium sponge, applied in the direction of improving process efficiency, etc., can solve the problems of low process yield, poor working conditions, high impurities in palladium intermediate products, etc., and achieve the effect of simple operation, easy promotion and high recovery rate

Active Publication Date: 2014-03-26
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two methods all have characteristics such as aqua regia acid dissolution, poor working conditions in the nitrate removal process, serious environmental hazards, high impurity content in palladium intermediate products, high requirements for supporting reduction equipment, and large investment. The process yield is relatively low

Method used

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  • Method for extracting palladium sponge from silver electrolysis anode slime parting liquid

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Embodiment 1

[0035] A method for extracting palladium sponge from silver electrolysis anode slime gold separation liquid, is characterized in that:

[0036] Using silver electrolysis anode slime as raw material, after the gold is dissolved and separated by nitric acid, the palladium and silver in the liquid after gold separation are recovered and extracted; the method includes the following steps:

[0037] Step 1: Xanthate Enrichment

[0038] will be 0.5 m 3 Transfer the silver electrolytic anode slime gold separation liquid containing 6.85g / L palladium into the enamel reaction kettle, adjust the silver electrolytic anode slime gold separation liquid with NaOH to pH=0.5~4.5, the best pH=1.0, and raise the temperature , add xanthate dissolved in deionized water at the same time, the quality of adding butyl xanthate is 1.0 to 5.0 times the theoretical amount of palladium and xanthate complexation reaction, and the optimal xanthate amount is 3.0 times the amount of palladium in the solution;...

Embodiment 2

[0057] The silver electrolysis anode slime gold solution contains 1.7g / L of Pd, and the enrichment reaction temperature of xanthate is 85℃. Other operating conditions and process are described with embodiment 1. The purity of the sponge palladium product obtained in this process is: Pd: 99.992%, Au: 0.0017%, Ag: 0.0020%, Cu: 0.0009%, Ni: 0.0002%; Fe: 0.0005%, Pb: 0.0004%, reaching GB1420-89 standard . The recovery rate of palladium in the process reaches 96.2%.

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Abstract

The invention provides a method for extracting palladium sponge from a silver electrolysis anode slime parting liquid. The method is characterized in that a palladium-containing enrichment material in a gold and silver smelting process is utilized to extract the palladium sponge through a hydrometallurgical process, and the method comprises the following steps: enriching by using xanthate, dissolving by an acid, precipitating silver, precipitating palladium by using ammonium chloride, dissolving by hot water, neutralizing by ammonia water to remove impurities, acidifying by hydrochloric acid to precipitate, re-dissolving by ammonia water for purifying, reducing by hydrazine hydrate, and drying the palladium sponge. Compared with routing technologies, the method has the characteristics of adoption of routine equipment, no aqua regia dissolution or nitrate removal process, good operation environment, simple and practical flow, low cost, and product combination diversification, and has the advantages of palladium recovery rate of above 96%, stable product quality, and product purity of 99.99%.

Description

technical field [0001] The invention relates to a method for extracting palladium sponge from silver electrolysis anode slime gold separation solution, which belongs to the field of precious metal hydrometallurgy technology and comprehensive recovery. technical background [0002] Palladium is a platinum group element and is a precious metal. Mainly widely used in electrical instruments, precision alloys and fine chemical load catalysts, etc. Due to its scarcity, difficulty in extraction, wide range of uses, and high price, the enrichment, extraction, and recovery of palladium from metallurgical processes or electronic product waste have extremely important economic value and environmental protection benefits. [0003] Lead smelting anode slime contains high gold, silver and a small amount of precious metals such as platinum and palladium. During the recovery process of gold and silver smelting, rare and precious metals such as platinum and palladium are enriched, which has...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 李栋刘万里李波柴承平谭霖杨跃新曹永贵
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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