Platinum recovery refining process

A process and process step technology, applied in the field of platinum recovery and refining process, can solve the problems of low production efficiency, long production cycle, large solution processing capacity, etc., and achieve improved yield and quality, reduced production cost, and good operability. Effect

Inactive Publication Date: 2015-07-01
KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sodium bromate hydrolysis method and the oxidized carrier hydrolysis method have a large amount of solution and need to be left to settle for a long time, occupying space and space, and the production cycle is long, and large-scale production cannot be carried out
The existing recycling process has high labor intensity, low production efficiency, inconvenient operation and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A platinum recovery and refining process, comprising the following process steps:

[0021] a. Carbonize 100kg of platinum-containing material at 750°C for 1.5 hours;

[0022] b. After cooling to room temperature, add 200kg of aqua regia to dissolve, and control the temperature between 65°C until the dissolution is complete;

[0023] c. Add 300kg ammonium chloride to precipitate for 0.5 hour. After the precipitation is completed, ammonium chloroplatinate is filtered and washed;

[0024] d. Add 200kg of sodium hydroxide to dissolve, and complete the dissolution after 20 minutes to form a solution;

[0025] e. After heating the solution in step d to 45° C., 200 kg of hydrazine hydrate was added for reduction. The reaction time was 0.5 hours, and the recovery of platinum was completed;

[0026] f. Drying the reduced platinum powder.

Embodiment 2

[0028] A platinum recovery and refining process, comprising the following process steps:

[0029] a. Carbonize 100kg of platinum-containing material at 800°C for 2 hours;

[0030] b. After cooling to room temperature, add 250kg of aqua regia to dissolve, and control the temperature between 70°C until the dissolution is complete;

[0031] c. Add 400kg ammonium chloride to precipitate for 1 hour. After the precipitation is completed, ammonium chloroplatinate is filtered and washed;

[0032] d. Add 250kg of sodium hydroxide to dissolve, and complete the dissolution after 30 minutes to form a solution;

[0033] e, heating the solution in step d to 50°C, adding 250kg of hydrazine hydrate for reduction, the reaction time is 1 hour, and the recovery of platinum is completed;

[0034] f. Drying the reduced platinum powder.

Embodiment 3

[0036] A platinum recovery and refining process, comprising the following process steps:

[0037] a. Carbonize 100kg of platinum-containing material at 850°C for 2.5 hours;

[0038] b. After cooling to room temperature, add 300kg of aqua regia to dissolve, and control the temperature between 75°C until the dissolution is complete;

[0039] c. Add 500kg ammonium chloride to precipitate for 1.5 hours. After the precipitation is completed, ammonium chloroplatinate is filtered and washed;

[0040] d. Add 300kg of sodium hydroxide to dissolve, and complete the dissolution after 40 minutes to form a solution;

[0041] e. After heating the solution in step d to 55° C., 300 kg of hydrazine hydrate was added for reduction. The reaction time was 1.5 hours, and the recovery of platinum was completed;

[0042] f. Drying the reduced platinum powder.

[0043] The beneficial effects of the invention are: the time required for the recovery process is greatly shortened, the production cost ...

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PUM

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Abstract

The invention discloses a platinum recovery refining process. The platinum recovery refining process is characterized by comprising the following process steps: a. carbonizing a platinum-containing material for 1.5-2.5 hours at 750-850 DEG C; b. cooling to a room temperature and then adding aqua regia to dissolve the material at 65 to 75 DEG C until the material is completely dissolved; c. adding ammonium chloride and precipitating for 0.5-1.5 hours; after the precipitation is finished, filtering and washing ammonium chloroplatinate; d. adding sodium hydroxide till dissolving in 20-40 minutes to form dissolution solution; e. heating the dissolution solution obtained in the step d to 45-55 DEG C and then adding hydrazine hydrate for reducing, and reacting for 0.5-1.5 hours to finish platinum recovery; f. drying the reduced platinum powder. The recovery process disclosed by the invention has the beneficial effects of greatly shortened process time, reduced production cost, good operability, low energy consumption, and capability of greatly improving the yield and the quality of platinum metal products.

Description

technical field [0001] The invention relates to a recovery and refining process, in particular to a platinum recovery and refining process. Background technique [0002] There are many refining methods for platinum, which can be summarized as carbonyl platinum chloride method, molten salt electrolysis method, zone smelting method, ammonium chloride repeated precipitation method, sodium bromate hydrolysis method, oxidation carrier hydrolysis method, etc. Among them, the carbonyl chloride method and the molten salt electrolysis method are complicated in process and cumbersome in operation, which limits their large-scale production and application. The zone smelting method is mainly used to produce ultra-high purity platinum, and it is rarely used in large-scale industrial production. The sodium bromate hydrolysis method and the oxidized carrier hydrolysis method have a large amount of solution to be processed and need to stand still for a long time to settle, occupy space and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
Inventor 徐涛
Owner KUNSHAN HONGFUTAI ENVIRONMENTAL PROTECTION TECH
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