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Method for recovering platinum from silver electrolyte

An electrolyte and filtrate technology, applied in the field of metallurgy, can solve the problems of poor platinum recovery selectivity, low recovery rate, impurities affecting the subsequent use of electrolyte, etc., and achieve the effects of complete replacement, improved recovery rate, and simple operation

Inactive Publication Date: 2014-09-03
SIHUI CITY HONGMING PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for recovering platinum from silver electrolyte, which solves the problems of poor recovery selectivity and low recovery rate of platinum in the traditional method, and the introduction of impurities affects the subsequent use of the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Silver electrolyte 3000L, its composition is: platinum 0.95g / l, palladium 0.34g / l, copper 24.6g / l.

[0018] (1) Transfer the platinum-containing silver electrolyte to a stirring tank, add reduced silver powder at a ratio of platinum: reduced silver powder = 1:10 (mass ratio), stir and replace for 6 hours, and the supernatant of the platinum-containing silver electrolyte The platinum dropped to 0.004g / l.

[0019] (2) After the replacement, use a small filter press for solid-liquid separation to obtain filtrate and filter residue. The filtrate contains 0.004g / l platinum, 0.34g / l palladium, and 24.6g / l copper. The filtrate is returned as electrolyte and used for filter residue Wash with pH ≈ 2 acidified water with nitric acid until the washing water is colorless to obtain platinum concentrate.

[0020] (3) Platinum concentrate is first put into a drying oven to dry, and then put into a muffle furnace for calcination at 500°C for 2 hours.

[0021] (4) Dissolve the calcine...

Embodiment 2

[0026] Silver electrolyte 2800L, its composition is: platinum 0.86g / l, palladium 0.30g / l, copper 23.2g / l.

[0027] (1) Transfer the platinum-containing silver electrolyte to a stirring tank, add reduced silver powder in the ratio of platinum: reduced silver powder = 1:8 (mass ratio), stir and replace for 6 hours, the supernatant of the platinum-containing silver electrolyte Platinum dropped to 0.0036g / l.

[0028] (2) After the replacement, use a small filter press for solid-liquid separation. The filtrate contains 0.0036g / l platinum, 0.29g / l palladium, and 23.3g / l copper. The filtrate is returned as the electrolyte, and the filter residue is acidified with nitric acid at pH ≈ 2. Wash with water until the washing water is colorless to obtain platinum concentrate.

[0029] (3) Platinum concentrate is first dried in a drying oven, and then calcined in a muffle furnace at 600°C for 3 hours.

[0030] (4) Dissolve the calcined platinum concentrate with 1:1 nitric acid (mix one vol...

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Abstract

The invention discloses a method for recovering platinum from a silver electrolyte. In the invention, reducing silver powder is directly added into an electrolyte for replacement to recover the platinum concentrate without heating or regulating the pH value; and thus, the invention is simple to operate. The reducing silver powder only replaces the platinum, but does not replace palladium and other metals, and thus, the invention has the advantages of favorable platinum selectivity and complete replacement. In the platinum replacement process, no other ions or impurities are introduced, the electrolyte after separating the platinum can be used repeatedly, and the precipitated platinum concentrate only contains excessive silver powder and slight amounts of other impurities, thereby shortening the subsequent platinum purification process and enhancing the recovery rate of platinum (up to higher than 98%).

Description

Technical field: [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering platinum from silver electrolyte. Background technique: [0002] About 50-60% of the platinum in the anode of the silver electrolysis process enters the electrolyte. One of the traditional recovery methods for platinum is to use activated carbon to adsorb, but there are the following disadvantages: the activated carbon needs to be pretreated and regenerated; the electrolyte needs to be heated to At 80-90°C, sodium hydroxide needs to be heated to adjust the pH to 1.5-1.8, and the accumulated sodium ions will affect the reuse of the electrolyte after platinum precipitation; the adsorption capacity of activated carbon is small, and the adsorption efficiency is not high; Activated carbon not only adsorbs platinum, but also adsorbs metals such as palladium, silver, and bismuth, which has poor selectivity and makes subsequent purification more di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 江继明江启明黄明程兰
Owner SIHUI CITY HONGMING PRECIOUS METALS
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