A platinum separation and purification process

A technology, concentrated nitric acid technology, applied in the field of platinum separation and purification technology, can solve the problems of lengthy extraction process, turbid extraction system, low extraction efficiency, etc., achieve good extraction and separation effect, improve purity, and reduce use cost

Active Publication Date: 2020-08-04
中宝正信金银珠宝首饰检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lengthy extraction process, low yield and high cost of the precipitation method, the solvent extraction method has a simple process, greater applicability and flexibility to various materials, and a large processing capacity, so it is vigorously promoted and applied; however, the solvent extraction method is used to extract There are some problems with platinum. The extraction efficiency of platinum in the existing extraction system is low, and when the concentration of platinum increases, the concentration of the association system formed by platinum and the extractant is high, the extraction system is turbid, and the phase separation speed is slow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A platinum separation and purification process, comprising the following steps:

[0026] (1) Take the platinum waste material, add 68wt% concentrated nitric acid, control the heating temperature at 96° C., stir, then add 0.15% oxidant (sodium peroxide) of the platinum waste material weight, stir, filter after the reaction, and collect the platinum slag;

[0027] (2) take step (1) platinum slag, add excess aqua regia and heat to dissolve, remove concentrated nitric acid, obtain platinum concentrated solution through concentration again;

[0028] (3) Take the platinum concentrate in step (2), and add the organic phase (0.012mol / L of N-2-chlorophenyl-N'-benzoylthiourea, phosphoric acid Tributyl ester and toluene were mixed according to the volume ratio of 1:1:2), stirred and mixed, adjusted to pH 4.2, heating temperature was controlled at 80°C, left to stand for phase separation, and the aqueous phase and extract were collected respectively;

[0029] (4) Take the extract ...

Embodiment 2

[0033] A platinum separation and purification process, comprising the following steps:

[0034] (1) Get the platinum waste material, add 70wt% concentrated nitric acid, control the heating temperature at 98° C., stir, then add 0.2% oxidant (sodium peroxide) of the platinum waste material weight, stir, filter after the reaction, and collect the platinum slag;

[0035] (2) take step (1) platinum slag, add excess aqua regia and heat to dissolve, remove concentrated nitric acid, obtain platinum concentrated solution through concentration again;

[0036] (3) Take the platinum concentrated solution in step (2), and add the organic phase (0.014mol / L of N-2-chlorophenyl-N'-benzoylthiourea, phosphoric acid Tributyl ester, n-octane according to the volume ratio of 1.5:1:2), stir and mix, adjust the pH to 4.5, control the heating temperature at 82°C, let stand to separate the phases, and collect the water phase and the extract respectively;

[0037] (4) Take the extract in step (3), adj...

Embodiment 3

[0041] A platinum separation and purification process, comprising the following steps:

[0042] (1) Take the platinum waste material, add 78wt% concentrated nitric acid, control the heating temperature at 102°C, stir, then add 0.35% oxidant (hydrogen peroxide) of the platinum waste material weight, stir, filter after the reaction, and collect the platinum slag;

[0043] (2) take step (1) platinum slag, add excess aqua regia and heat to dissolve, remove concentrated nitric acid, obtain platinum concentrated solution through concentration again;

[0044] (3) Take the platinum concentrate in step (2), and add the organic phase (N-2-chlorophenyl-N'-benzoylthiourea, phosphoric acid in the ratio of 1:1.8 according to O / A Tributyl ester and isoamyl alcohol according to the volume ratio of 1.8:1.2:3), stir and mix, adjust the pH to 4.8, control the heating temperature at 83°C, let stand to separate the phases, and collect the water phase and the extract respectively;

[0045] (4) Get...

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Abstract

The invention relates to the technical field of precious metal separation and purification, in particular to a platinum separation and purification process, including base metal de-doping treatment, extraction treatment, stripping treatment and reduction treatment. Utilizing the separation and purification method in the present invention greatly improves the extraction efficiency of platinum and also improves the purity of platinum.

Description

technical field [0001] The invention relates to the technical field of precious metal purification, in particular to a platinum separation and purification process. Background technique [0002] Platinum, also known as platinum, has superior chemical stability and can be used as jewelry decorations or handicrafts, as well as high-grade chemical vessels, platinum crucibles, electrodes or catalysts in chemical reactions; in addition, in the field of special materials, platinum can be used It is an important raw material for the production of high temperature thermocouples. [0003] At present, the separation and purification methods of platinum are commonly used precipitation method and solvent extraction method. Due to the lengthy extraction process, low yield and high cost of the precipitation method, the solvent extraction method has a simple process, greater applicability and flexibility to various materials, and a large processing capacity, so it is vigorously promoted a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/40
CPCC22B11/042C22B3/409Y02P10/20
Inventor 邵文英解学霞
Owner 中宝正信金银珠宝首饰检测有限公司
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