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A kind of processing method of sponge palladium

A treatment method, sponge palladium technology, applied in the field of high-purity metal materials, can solve the problems of easy flying loss, fine sponge palladium particles, inconvenient transportation and use, etc., to avoid flying loss, increase particle size, avoid calcination and hydrogen flow The effect of the restoration process

Active Publication Date: 2019-04-30
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for improving the properties of the obtained sponge metal palladium by direct reduction, the method is simple to operate, saves the hydrogen reduction process, is conducive to improving the particle size of the palladium sponge, and solves the problem of palladium sponge particles obtained by the direct reduction method. Thin, easy to fly and lose, inconvenient to transport and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Raw materials: prepare dichlorotetraammine sub-palladium complex solution (the concentration of palladium ion is 40g / L), reduce the reducing agent formic acid containing palladium solution, quartz beaker, filter paper and funnel.

[0040] (2) Preparation of palladium sponge: at a temperature of 80° C., add an appropriate amount of formic acid to the dichlorotetraammine palladium complex solution, and stir while adding, so that the palladium in the solution is completely precipitated. Then the sponge palladium precipitate was filtered, washed and dried.

[0041] (3) Sponge palladium treatment: put the reduced sponge palladium into the ceramic crucible, then install the furnace, vacuumize to below 0.1Mpa, and keep the vacuum during the heating process. It takes 0.5h to raise the temperature to 200°C and keep it warm for 2h to fully dehydrate the palladium sponge. After that, the temperature was further raised, and the temperature was raised to 1000° C. after 2 hours,...

Embodiment 2

[0043] (1) Raw material preparation: prepare ammonium chloropalladate solution (concentration of palladium ion is 50g / L), reduce the reducing agent sodium formate containing palladium solution, quartz beaker, filter paper and funnel.

[0044] (2) Preparation of palladium sponge: add an appropriate amount of sodium formate to the ammonium chloropalladate solution, and stir while adding, so that the palladium in the solution is completely precipitated. Then the sponge palladium precipitate was filtered, washed and dried.

[0045] (3) Sponge palladium treatment: put the reduced sponge palladium into the ceramic crucible, then install the furnace, vacuumize to below 0.1Mpa, and keep the vacuum during the heating process. It takes 0.5h to raise the temperature to 200°C and keep it warm for 2h to fully dehydrate the palladium sponge. After that, the temperature was further raised, and the temperature was raised to 1200° C. after 3 hours, and the temperature was kept for 2 hours to ...

Embodiment 3

[0047] (1) Prepare materials: prepare chloropalladium acid solution (the concentration of palladium ion is 60g / L), reducing agent hydrazine hydrate, quartz beaker, filter paper and funnel.

[0048] (2) Preparation of palladium sponge: add an appropriate amount of hydrazine hydrate to the chloropalladium acid solution, and stir while adding, so that the palladium in the complex solution is completely precipitated. Then the sponge palladium precipitate was filtered, washed and dried.

[0049] (3) Sponge palladium treatment: put the reduced sponge palladium into the ceramic crucible, then install the furnace, vacuumize to below 0.1Mpa, and keep the vacuum during the heating process. It takes 0.5h to raise the temperature to 200°C and keep it warm for 2h to fully dehydrate the palladium sponge. Afterwards, the temperature was further raised, and the temperature was raised to 1100 ° C by 2.5 hours, and the temperature was kept for 2.5 hours to fully remove volatile impurities. Co...

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Abstract

The invention relates to a treatment method for sponge palladium, and belongs to the field of high-purity metal materials. The method comprises the steps that firstly, the sponge palladium is arranged in a crucible and placed in a vacuum furnace, and vacuum pumping is conducted; then, temperature rise is conducted for water removal, temperature rise is further conducted for impurity removal, and the character of the sponge palladium is changed; and finally, furnace cooling is conducted. The treatment method for the sponge palladium is suitable for the sponge palladium obtained by reducing a palladium containing solution through formic acid, sodium formate, hydrazine hydrate and other reducing agents, and the treatment method can also be applied to treatment of the fine-particle sponge palladium prepared through other methods. The sponge palladium obtained through reduction is subjected to vacuum sintering treatment, and then the shape of the sponge palladium is changed into gray blocks with the metal luster from the black powder with fine particles; and subsequent using, packaging and transporting are facilitated for the treated sponge palladium. By means of the method, flying losses of the sponge palladium in the reduction state can be effectively avoided, the utilization rate of precious metal materials is increased, the sintering and hydrogen inflation reduction processes are omitted, and the treatment method has the beneficial effects that operation is easy, and batched production is facilitated.

Description

technical field [0001] The invention relates to a treatment method for precious metals, in particular to a treatment method for palladium sponge, which belongs to the field of high-purity metal materials. Background technique [0002] Palladium has high physical and chemical stability, excellent adsorption performance, high electrical conductivity and thermal conductivity, and unique electrical and magnetic properties. Palladium or palladium alloy materials can be used as catalysts for automobile exhaust treatment, electrical contact materials, optical materials, etc. Key materials for devices and electrode catalysts for fuel cells play an important role in aerospace, automotive, electronics, fuel cells and other fields. [0003] The palladium-containing enrichment obtained from various precious metal raw materials is further processed to obtain a single crude metal palladium, but its purity generally cannot meet the needs of modern industry and technology, and further proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/02C22B11/00C22B9/14
CPCC22B9/14C22B11/02C22B11/04
Inventor 柳旭王冉胡国红宋涛李彬延凤泊
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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