Method for high-efficiency separation of palladium from silver electrolyte

An electrolyte and silver electrolytic cell technology, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of inapplicability, impurity removal and recovery of palladium and silver electrolyte properties and composition changes, and improve production efficiency. and productivity, prolong the continuous use cycle, improve the effect of working environment conditions

Inactive Publication Date: 2014-01-22
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many of the above methods have the following problems: 1) The co-precipitation rate of silver is relatively high, which is not suitable for the removal of impurities and recovery of palladium in the silver electrolysis production process; 2) The treatment of palladium precipitates is cumbersome and the cost is high; 3) The separation effect of palladium is poor , the palladium content in the silver electrolyte after palladium separatio

Method used

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  • Method for high-efficiency separation of palladium from silver electrolyte
  • Method for high-efficiency separation of palladium from silver electrolyte
  • Method for high-efficiency separation of palladium from silver electrolyte

Examples

Experimental program
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Example Embodiment

[0042] Example 1

[0043] Get the silver electrolyte 2000mL that element content is shown in table 1, wherein the mass volume concentration C of palladium Pd is 0.44g / L, then the quality of palladium in this silver electrolyte is 0.88g; The mass volume concentration C of free nitric acid in this silver electrolyte HNO3 Meet the requirements of 10-20g / L, heat to 35°C to obtain the heated solution; accurately weigh 1.76g high-efficiency palladium-removing agent R-DH with an electronic balance; add the weighed high-efficiency palladium-removing agent R-DH to heating The final solution was stirred and reacted for 60 minutes, and vacuum filtered to obtain the palladium-removed liquid and palladium complex. The palladium-removed liquid volume was 1950mL, and the palladium content was 0.013g / L; The separation rate was 96.8%; the quality of the palladium complex was 2.65g, and the content of each element in the palladium complex was shown in Table 2; the palladium complex was washed ...

Example Embodiment

[0050] Example 2

[0051] Get the silver electrolyte 2000mL that element content is shown in table 5, wherein the mass volume concentration C of palladium Pd is 0.55g / L, then the quality of palladium in this silver electrolyte is 1.10g; The mass volume concentration C of free nitric acid in this silver electrolyte HNO3 Meet the requirements of 10-20g / L, heat to 40°C to obtain the heated solution; accurately weigh 2.42g high-efficiency palladium-removing agent R-DH with an electronic balance; add the weighed high-efficiency palladium-removing agent R-DH to heating The final solution was stirred and reacted for 30 minutes, and vacuum filtered to obtain the palladium-removed liquid and palladium complex. The palladium-removed liquid volume was 2000mL, and the palladium content was 0.0030g / L; it can be seen that after palladium-containing silver electrolyte, the palladium The separation rate was 98.45%; the mass of the palladium complex was 3.5 g, and the content of each element ...

Example Embodiment

[0060] Example 3

[0061] Take a silver electrolyte with a palladium mass concentration of 0.2-0.5g / L, and use an inductively coupled plasma emission spectrometer (ICP-AES) to accurately analyze and measure the mass volume concentration C of palladium in the silver electrolyte. Pd and the mass volume concentration C of free nitric acid HNO3 ; The mass volume concentration C of free nitric acid in the silver electrolyte HNO3 If it does not meet the requirement of 10-20g / L, add nitric acid to the silver electrolyte so that the mass volume concentration of free nitric acid in the silver electrolyte meets the requirement of 10-20g / L, and heat it to 45°C to obtain the heated solution Accurately weigh high-efficiency palladium-removing agent R-DH with electronic balance, the weighing M of this efficient palladium-removing agent R-DH is 1.9 times of the contained palladium quality in the silver electrolyte of getting, and the content of palladium in the silver electrolyte of getting...

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Abstract

The invention provides a method for high-efficiency separation of palladium from a silver electrolyte. The method comprises the following steps: allowing the mass volume concentration of free nitric acid in the silver electrolyte to accord with requirements and heating the silver electrolyte; weighing a high-efficiency palladium removing agent, adding the high-efficiency palladium removing agent into the heated silver electrolyte and successively carrying out a reaction with stirring and vacuum filtration so as to obtain a palladium-removed liquid and a palladium complex; washing the palladium complex; adding the palladium-removed liquid into a silver electrolytic tank and carrying out silver electrolysis so as to obtain silver powder; when the mass volume concentration of palladium in a solution in the silver electrolytic tank is more than or equal to 0.4 g/L, separating palladium from the solution and returning palladium-removed liquid to the procedure of silver electrolysis for refining and cyclic utilization; and when the concentrations of a variety of other impurity ions in the solution in the silver electrolytic tank exceed prescribed limits of the silver electrolyte, extracting out the silver electrolyte, separating palladium out and carrying out treatment of a waste silver electrolyte. With the method, high-efficiency high-selectivity one-step separation of palladium from a complex silver electrolyte can be realized, the deposition rates of metals like silver and copper are extremely low, properties of the solution are not destroyed, the solution can be returned to the silver electrolytic tank for cyclic utilization, and purifying and palladium removal efficiency of the electrolyte can be improved.

Description

technical field [0001] The invention belongs to the technical field of rare and precious metal hydrometallurgy, and relates to a method for separating palladium from a silver electrolyte, in particular to a method for efficiently separating palladium from a silver electrolyte. Background technique [0002] In the process of producing high-purity silver powder by silver electrolytic refining, the main impurity element that affects the quality of silver powder is palladium. For example, in the process of producing IC-Ag99.99 silver products, the maximum allowable content of palladium is less than 10g / t. Since the standard electrode potentials of palladium and silver are close, in the process of electrolytic refining of high-purity silver powder in nitric acid system, the dissolution rate of palladium element is as high as 40-75%. When it enters the silver electrolyte, part of palladium is deposited on the cathode, and the electrolytic silver powder contains up to 50g of palladi...

Claims

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Application Information

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IPC IPC(8): C25C1/20C22B3/44
CPCY02P10/20
Inventor 马玉天钟清慎陈大林黄虎军冯岩孙以升刘世和李芬霞蔡静
Owner JINCHUAN GROUP LIMITED
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