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Method for collection of ruthenium or ruthenium compound

A ruthenium compound and recovery method technology, applied in silicon compounds, chemical instruments and methods, separation methods, etc., can solve the problems of limited use of materials, complicated procedures, strong corrosiveness, etc.

Inactive Publication Date: 2013-10-30
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding the method for separation and recovery of ruthenium and ruthenium compounds, various schemes have been proposed, usually there is an oxidative distillation method that uses oxidants such as halogen gas, sodium hypochlorite, sodium bromate, and ozone to generate ruthenium tetroxide and reclaims by distillation (for example, refer to patent document 1 ~4), but the oxidative distillation method has the following problems: the generated ruthenium tetroxide is unstable and self-decomposes to cause an explosion, the corrosion (oxidation) is strong and the materials used are limited, etc.
However, they are technologies developed mainly for the purpose of refining and refining separation from ores, rather than methods developed for recovering ruthenium or ruthenium compounds from low-concentration aqueous solutions of ruthenium. Therefore, there are problems such as complicated procedures, and, When containing salts, lower alcohols, and organic acids that hinder redox operations, ionization, etc., there are problems such as lower recovery rates

Method used

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  • Method for collection of ruthenium or ruthenium compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] In a 500ml conical beaker made of glass, 340g of an aqueous solution containing 680ppm ruthenium, 8wt% sodium chloride and 0.5wt% acetic acid, and 1.4 mass times of ruthenium, i.e. 0.32g, was added tricalcium phosphate as an inorganic adsorbent (Wako Pure Chemical Industries, Ltd.) Tricalcium phosphate manufactured by the company. Hereinafter referred to as "TCP"), start stirring with a magnetic stirrer. Next, in order to dissolve the inorganic adsorbent, a 70wt% sulfuric acid solution was added using a safety pipette (Komagome pipette) until the pH reached 3, and stirring was continued for 30 minutes to dissolve the tricalcium phosphate. The addition amount of the sulfuric acid solution at this time was 7.5 g. Next, in order to precipitate the dissolved inorganic adsorbent, a 25wt% sodium hydroxide solution was added using a safety pipette until the pH reached 7, and then stirring was continued for 30 minutes to precipitate tricalcium phosphate. The addition amount of ...

Embodiment 2

[0081] In addition to using 290 g of an aqueous solution containing 690 ppm of ruthenium, and 0.29 g of hydroxyapatite, which is 1.5 times the mass of ruthenium, as an inorganic adsorbent (APATITE HAP manufactured by Wako Pure Chemical Industries, Ltd., monoclinic crystal, abbreviated as "HAP") , Implement the same operation as in Example 1. The concentration of ruthenium in the obtained filtrate was 4.6 ppm.

Embodiment 3

[0083] In addition to using 300 g of an adsorption raw material aqueous solution containing 650 ppm of ruthenium and 0.29 g of hydrotalcite as an inorganic adsorbent (hydrotalcite manufactured by Wako Pure Chemical Industries, Ltd., hereinafter referred to as "HT") that is 1.4 times the mass of ruthenium, and The same operation as in Example 1. The concentration of ruthenium in the obtained filtrate was 9.5 ppm.

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Abstract

According to the present invention, it becomes possible to collect ruthenium or a ruthenium compound, which is expensive, with high efficiency even from an aqueous solution containing a water-soluble salt, a lower alcohol, an organic acid or the like by adding at least one specific inorganic adsorbent to an aqueous solution containing ruthenium or the ruthenium compound, dissolving the entire or a portion of the inorganic adsorbent under acidic conditions, and adding an alkali to the solution to adjust the pH value of the solution to an alkaline pH value of 7 or more to thereby adsorb the ruthenium compound onto the inorganic adsorbent while precipitating the inorganic adsorbent.

Description

Technical field [0001] The present invention relates to a technology for efficiently recovering ruthenium or a ruthenium compound from an aqueous solution containing ruthenium or a ruthenium compound using a specific inorganic adsorbent. Background technique [0002] Ruthenium, one of the rare metals, is used not only as a chemical catalyst, but also as materials for the electronics industry such as electrodes and resistance elements, and plating materials. In recent years, there has been a significant increase in demand for hard disk applications that utilize the magnetic properties of ruthenium. , Based on the balance of output and demand, causing prices to soar. Therefore, it is necessary to recover the ruthenium compound at a high recovery rate from an aqueous solution containing a ruthenium compound or the like, waste water, etc., and to recycle it. Regarding methods for separating and recovering ruthenium and ruthenium compounds, various proposals have been proposed. Gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00B01J20/04B01J20/12B01J20/16B01J20/34C02F1/28C22B3/44C22B7/00
CPCC02F2101/20C22B3/24C22B11/04C22B11/046C02F1/281C02F1/5236C02F1/66C02F1/722C02F2001/5218B01J20/041B01J20/043B01J20/046B01J20/048B01J20/08B01J20/3433B01J20/3475B01J20/165Y02P10/20C22B11/00B01J20/04B01J20/12B01J20/16B01J20/34C02F1/28C22B3/44C22B7/00
Inventor 大内贵西村喜男
Owner MITSUBISHI GAS CHEM CO INC
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