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Method for separating and purifying platinum by adopting holding potential

A purification method and potential technology, which can be applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of low selectivity, poor material adaptability, and unsatisfactory results.

Active Publication Date: 2012-11-28
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, the commonly used platinum separation and purification methods include selective precipitation, solvent extraction, ion exchange, etc., but there are problems such as poor material adaptability, low selectivity, and low purification efficiency. To obtain high-purity platinum must After repeated purifications, the purification process must be adjusted for different types of materials, and the associated platinum group metals are easy to disperse, and the comprehensive recovery rate of precious metals is not high
These techniques have relatively loose control over the process conditions, so the results obtained are often not ideal

Method used

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  • Method for separating and purifying platinum by adopting holding potential
  • Method for separating and purifying platinum by adopting holding potential

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw material is an ammonia oxidation catalytic net for nitric acid industry, and after dissolving in aqua regia and removing nitric acid with hydrochloric acid, a solution of hydrochloric acid medium is obtained. The volume of feed liquid is 35.00L, and the composition analysis is shown in Table 1.

[0019] Table 1 Example 1 raw material composition table

[0020]

[0021] ①Adjust the acidity of the solution to a pH value of 1~1.5, exchange it twice with a cationic resin, and take samples for detection. The mass fraction of Ni, Fe, Al, Cr and other elements in the solution relative to Pt can reach GB 1419-2004 "Sponge Platinum The standard of 99.95% sponge platinum in the standard; ②add hydrochloric acid, adjust the pH value of the solution to 0.5~1, control the temperature above 90°C, add industrial hydrogen peroxide slowly under stirring, and monitor the solution in real time with a pHSJ-3F potentiometer When the solution potential is stable at about 700mV, s...

Embodiment 2

[0024] The raw material is the concentrated ore enriched by the waste catalyst of automobile exhaust, and the feed liquid is obtained after dissolving, hydrochloric acid medium, the volume of the solution is 27.30L, and the composition analysis is shown in Table 2.

[0025] Table 2 Example 2 raw material composition list

[0026] element

Pt

PD

Rh

Cu

Fe

Pb

Al

Zn

Contentg / L

45.80

31.26

7.78

0.42

1.30

0.31

0.75

1.21

Total amount g

1250.34

853.40

212.39

11.47

35.49

8.46

20.48

33.03

[0027] ①Adjust the acidity of the solution to a pH value of 1~1.5, and exchange it with cationic resin for 4 times; ②Add hydrochloric acid, adjust the pH value of the solution to 0.5~1, control the temperature above 90°C, slowly add industrial grade hydrogen peroxide while stirring, and at the same time Use a pHSJ-3F potentiometer to monitor the oxidation-reduction pote...

Embodiment 3

[0030] The raw material is a complex solution containing platinum, palladium, rhodium, and iridium obtained after the refining residue is dissolved. The medium is a hydrochloric acid system with a volume of 38.50 L. The composition analysis is shown in Table 3.

[0031] Table 3 Example 3 raw material composition list

[0032]

[0033]①Adjust the acidity of the solution to a pH value of 1~1.5, and exchange it with cationic resin for 3 times; ②Add hydrochloric acid, adjust the pH value of the solution to 0.5~1, control the temperature above 90°C, slowly add industrial grade hydrogen peroxide while stirring, and at the same time Use a pHSJ-3F potentiometer to monitor the oxidation-reduction potential of the solution in real time. When the potential of the solution reaches 650-700mV, stop adding hydrogen peroxide and keep it for more than 30 minutes; ③Add 1600g of reagent grade ammonium chloride, fully stir for 10 minutes, let stand, and cool overnight; ④ Filter out the yellow ...

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Abstract

The invention mainly relates to a novel method for separating and purifying platinum from complex platinum family metal solution. Base metal impurities in the solution are removed through ion exchange, pure platinum family metal solution can be obtained, ammonium chloride precipitate platinum is added under a certain oxidation-reduction potential, the electric potential is adjusted, precipitate containing platinum is reduced by a specific reducing agent, the platinum deposit is enabled to be resolved, then the oxidation-reduction potential is adjusted again, the platinum is oxidized to be high valence state again, the ammonium chloride is added so as to enable the platinum to be deposited again, the process of precipitation and resolution are repeated in such a way according to the complexity of raw materials until the ammonium chloroplatinate deposit with purity meeting the requirements can be obtained, and high-purity spongy platinum is obtained from the qualified ammonium chloroplatinate through the processes of reduction, washing, calcination and the like. The method has the advantages of short process, simplicity in operation, and high platinum recovery.

Description

technical field [0001] The invention relates to a method for realizing the separation and purification of platinum in complex precious metal feed liquid by adjusting the oxidation-reduction potential of the solution. Background technique [0002] Platinum has superior properties and is widely used. Jewelry In the industry, it is mainly used as decoration and crafts ; In the chemical industry, it is used to manufacture advanced chemical vessels, platinum crucibles, electrode and speed up chemical reaction of speed catalyst ; In the field of special materials, platinum is also widely used, the common ones are platinum-iridium alloy, platinum-rhodium alloy, etc., which are important raw materials for the production of high-temperature thermocouples. [0003] Since the properties of platinum group metals are very similar, the separation and purification of platinum group metals has always been an important research direction in the field of precious metal metallurgy. Up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/20C22B3/24
CPCY02P10/20
Inventor 贺小塘吴喜龙王欢郭俊梅明潇施秋杰韩守礼李锟李勇郑允
Owner GUIYAN RESOURCE YIMEN
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