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Method for recycling ruthenium from ruthenium-containing waste

A waste material, ruthenium tetroxide technology, applied to the improvement of process efficiency and other directions

Inactive Publication Date: 2011-08-10
JX NIPPON MINING & METALS CORP
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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
  • Method for recycling ruthenium from ruthenium-containing waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0049]

[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 80° C., and separated by filtration using a vacuum filter. 33 L of leaching solution containing ruthenium as impurities was obtained. Table 2 shows the composition, content and leaching rate of the leachate.

[0052] The composition, content and leaching rate of table 2 water leachate

[0053]

[0054] 3.8 kg of sodium bromate was added as an oxidizing agent to 33 L of this leach solution, and distillation treatment was performed at 80° C. for 2 hours. The volatilized ruthenium tetroxide was introduced into the hydrochloric acid solution specified in 6 to obtain 27 L of ruthenium hy...

Embodiment 2

[0063] Composition and content of the waste material containing ruthenium pulverized in table 5

[0064]

[0065] Put this mixture into a quartz boat, perform chlorination roasting treatment, water leaching, and filtration in the same manner as in Example 1, and obtain 35 L of ruthenium leachate containing impurities from the treated product. Table 6 shows the composition, content and leaching rate of the leachate.

[0066] The composition, content and leaching rate of table 6 water leachate

[0067]

[0068] 3.5 kg of sodium bromate was added as an oxidizing agent to 35 L of this leaching solution, and 29 L of a ruthenium hydrochloric acid solution was obtained in the same manner as in Example 1. Table 7 shows the composition, content, and recovery rate from waste of the ruthenium hydrochloric acid solution. The impurity components other than ruthenium in the hydrochloric acid solution were 1 mg / L or less. In addition, 96% of the ruthenium contained i...

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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 carbonThe 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 thin 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 usinge 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.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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Patent Type & Authority Patents(China)
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 CORP