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Ruthenium trichloride hydrate preparation method

A hydrated ruthenium trichloride and sodium chloride technology, applied in the field of metallurgy, can solve the problems of high equipment material requirements, rising production costs, long reaction time, etc., and achieve the elimination of environmental pollution problems, short production cycle and fast reaction speed Effect

Active Publication Date: 2018-01-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The most direct preparation method of ruthenium trichloride is to directly react ruthenium powder and chlorine gas at a certain temperature. However, due to the long reaction time and low efficiency of this method, it is rarely used in industry.
Although these two methods can produce ruthenium trichloride, spray drying and mechanical activation have higher requirements on the material of the equipment, which will inevitably lead to an increase in production costs.

Method used

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  • Ruthenium trichloride hydrate preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Metal ruthenium powder, in which Ru≥99.5%; analytically pure concentrated hydrochloric acid, in which the mass fraction of HCl is 36%~38%; analytically pure sodium chloride, in which NaCl≥99.5%; analytically pure soluble starch, in which the residue on ignition is ≤0.5% ; Analytical pure sodium hydroxide, wherein NaOH≥96.0%; Analytical pure absolute ethanol, wherein C 2 h 5 OH≥99.5%; industrial grade chlorine, of which Cl 2 ≥99.5%.

[0022] Weigh 20g of metal ruthenium powder, mix it evenly with 80g of sodium chloride and 0.2g of starch, and place it in a quartz crucible; place the quartz crucible in a well-type furnace, and then connect a gas absorption device at the flue gas outlet, the first stage and the second stage The secondary absorption liquid is a mixed solution of 500mL hydrochloric acid with a mass concentration of 5% and ethanol with a mass concentration of 3%, respectively, and the third-stage absorption liquid is a solution of 500mL with a sodium hydrox...

Embodiment 2

[0025] Metal ruthenium powder, in which Ru≥99.5%; analytically pure concentrated hydrochloric acid, in which the mass fraction of HCl is 36%~38%; analytically pure sodium chloride, in which NaCl≥99.5%; analytically pure soluble starch, in which the residue on ignition is ≤0.5% ; Analytical pure sodium hydroxide, of which NaOH≥96.0%; industrial grade chlorine, of which Cl 2 ≥99.5%.

[0026] Weigh 40g of metal ruthenium powder, mix it evenly with 200g of sodium chloride and 1g of starch, and place it in a quartz crucible; place the quartz crucible in a well-type furnace, and then connect the gas absorption device at the flue gas outlet, the first stage and the second stage The first-level absorption solution is a mixed solution of 1500mL hydrochloric acid with a mass concentration of 10% and ethanol with a mass concentration of 5%, and the third-level absorption solution is 1500mL of a sodium hydroxide solution with a mass concentration of 28%. When the temperature in the well-...

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Abstract

The invention discloses a ruthenium trichloride hydrate preparation method. Metallic ruthenium powder and sodium chloride are mixed for melting at a high temperature at first, and a trace amount of starch is added for maintaining a weak reducing atmosphere at the early heating stage; chlorine is introduced into the molten melt, so that most of the ruthenium powder is converted to sodium chlororuthenate; ruthenium tetroxide gas generated in the melting process is absorbed by a mixed solution of diluted hydrochloric acid and ethyl alcohol; after the sodium chlororuthenate obtained by melting andthe diluted hydrochloric acid solution with the absorbed ruthenium tetroxide are combined, black ruthenium hydroxide or ruthenium dioxide hydrate is generated after sodium hydroxide is added for neutralization, and after a product is filtered and washed for multiple times for removing sodium ions, dissolution with hydrochloric acid is conducted for concentration and crystallization to generate ruthenium trichloride hydrate crystals for preparation. According to the method, the chlorine is introduced into the melt for thorough stirring, and ruthenium conversion is efficiently promoted throughbath smelting, so that the reaction rate is fast, and the reaction efficiency is high; a trace amount of the starch is added into the material to control the early stage oxidation reaction rate of theruthenium powder, so that the production cycle is short, and the labor intensity is low.

Description

technical field [0001] The invention relates to pyrometallurgical and hydrometallurgical processes in the field of metallurgy, in particular to a preparation method of hydrated ruthenium trichloride. technical background [0002] Hydrated ruthenium trichloride is an important noble metal compound, which can be directly used as a catalyst, such as the metal anode active coating of the chlor-alkali industrial electrolytic cell, and can also be used as a raw material for the preparation of other chemical products, such as for the preparation of dodecacarbonyl trichloride Ruthenium and other organic ruthenium compounds. [0003] The most direct preparation method of ruthenium trichloride is to directly react ruthenium powder and chlorine gas at a certain temperature. However, due to the long reaction time and low efficiency of this method, it is rarely used in industry. The typical method currently used to prepare ruthenium trichloride is the process route of alkali fusion-oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
Inventor 张杜超杨天足刘伟锋陈霖卢一帆王豪
Owner CENT SOUTH UNIV
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