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Method for recycling ruthenium from ruthenium-containing waste

A waste, ruthenium tetroxide technology, applied in the direction of improving process efficiency, can solve problems such as insufficient separation, low ruthenium recovery rate, and inability to efficiently purify

Inactive Publication Date: 2009-09-02
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to insufficient separation, in order to obtain high-purity ruthenium, it is necessary to repeat the purification process, and the recovery rate of ruthenium is low, so it cannot be purified efficiently.

Method used

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  • Method for recycling ruthenium from ruthenium-containing waste

Examples

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Effect test

Embodiment 1

[0047] Examples of the present invention are described below. 5.2 kg of sodium chloride and 240 g of carbon powder were mixed with 1.0 kg of grinding dust and mixed waste of grinding dust generated when the ruthenium target was machined. The composition and content of the mixed waste are shown in Table 1. Here, the amount of sodium chloride added was 5.8 times the equivalent, and the amount of carbon was 1.9 times the equivalent of the amount of ruthenium contained in the scrap.

[0048] Table 1 Composition and content of waste materials containing ruthenium

[0049] Ru Al Ag Cu Ni Grade (mass%) 51.9 21.8 0.39 1.43 0.38 Content (g) 519 218 4 14 4

[0050] This mixture was put into a quartz boat, and heated to 780° C. in a tubular furnace whose core tube was made of quartz while circulating chlorine gas, and subjected to a chlorination roasting treatment for 3 hours.

[0051] The processed product was leached in warm water kept at 8...

Embodiment 2

[0062] In Example 2, the block-shaped end material scrap of the shaped ruthenium target is used as the raw material. The bulky end material waste was crushed with a crusher, and then pulverized with a hammer mill to obtain a powder sample that passed through a sieve with a mesh size of 500 μm. Table 5 shows the composition and content of the powder samples that passed through the sieve. 4.8 kg of sodium chloride and 220 g of carbon powder were mixed in 1.0 kg of the powder material. Here, the amount of sodium chloride added was 3.0 times the equivalent, and the amount of carbon was 1.0 times the equivalent of the amount of ruthenium contained in the waste.

[0063] Table 5 Composition and content of pulverized scrap containing ruthenium

[0064] Ru Fe Al Cr Ni Grade (mass%) 91.2 6.5 0.84 0.33 0.20 Content (g) 912 65 8 3 2

[0065] Put...

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PUM

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Abstract

The present invention provides a method for efficiently separating and recycling ruthenium from ruthenium-containing waste. The method comprises the steps of mixing sodium chloride and powdered carbon in powdered waste, wherein the amount of sodium chloride is 1 to 7 times of the amount needed in soluble chlorination reaction of ruthenium, and the amount of powdered carbon is 0.5 to 12 times of the needed amount; heating in chlorine atmosphere at 700 to 850 DEG C, thus obtaining soluble ruthenium salt; dissolving the ruthenium salt in water, changing ruthenium into ruthenium tetroxide by using oxidizer sodium bromate, oxidizing and distillating, and then purifying and recycling ruthenium in hydrochloric acid solution.

Description

technical field [0001] The present invention relates to a method for simply recovering ruthenium from waste materials containing ruthenium as waste. Background technique [0002] Ruthenium has the effect of increasing the recording capacity by interposing several atoms of ruthenium layers between the recording layers of the hard disk. The ruthenium layer was formed by sputtering. When machining ruthenium onto sputtering targets, cutting and grinding dust are generated. In addition, generally, only 20 to 40% of the target material for sputtering is used as a whole, and most of the raw material becomes waste. [0003] Therefore, in order to effectively utilize ruthenium which is a noble metal, it is indispensable to establish a technique for recovering and regenerating ruthenium. However, since ruthenium has a high melting point of 2250°C and is difficult to be dissolved by acids and alkalis, it is difficult to separate it from waste. In addition, in order to be used as a ...

Claims

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Application Information

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IPC IPC(8): C22B11/06C22B7/00
CPCY02P10/20
Inventor 永井灯文安部吉史河野雄仁
Owner JX NIPPON MINING & METALS CO LTD
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