Method for separating and recovering Ru from solution containing pt family

A technology for separation, recovery and solution, applied in the direction of improving process efficiency, can solve problems such as cracking, low volatility, and fog scattering, and achieve the effect of preventing decomposition, stable operation, and realizing operation.

Inactive Publication Date: 2006-06-14
JX NIPPON MINING & METALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, if air is blown into the distillate, there is a problem that harmful ruthenium tetroxide vapor leaks from the connection, or if clogging occurs, the pressure increases, causing the connection to fall off or break.
If the gas is blown into the solution, there is a problem that crystallization occurs especially at the front end where the gas contacts the liquid and is easy to clog.
[0006] In addition, when air is blown into the solution in the reaction tank, the mist containing ruthenium tetroxide vapor and platinum group elements other than Ru will scatter, and the purity of ruthenium chloride recovered with hydrochloric acid solution will decrease, so a mist trap is installed. , but the ruthenium tetroxide staying in the mist trap will gradually decompose and be converted into ruthenium dioxide with low volatility, so there is a problem of decreased recovery rate

Method used

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  • Method for separating and recovering Ru from solution containing pt family

Examples

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Embodiment 1

[0046] Embodiments of the present invention will be described below. Example using as figure 1 The distillation apparatus shown. 7 L of an acidic solution of hydrochloric acid containing Ru and a platinum group element adjusted to pH 1 was added to the reaction tank ( 1 ) installed in the mantle heater. Since ruthenium tetroxide was generated when sodium bromate was added to the solution, air was blown into the solution at a rate of 10 L / min while heating the solution to 80°C.

[0047] At this time, in order to prevent clogging, pure water was flowed into the air introduction tube at 0.1 L / hour. The air that contains ruthenium tetroxide vapor is passed into the 3% sodium bromate solution of the catch tank (2) that is heated to 80 ℃, then imports in the absorption tank (3,4) that puts 6N hydrochloric acid solution, will The ruthenium tetroxide vapor is recovered as a ruthenium chloride solution.

[0048] The air after passing through the absorption liquid contains bromine g...

Embodiment 2

[0053] Example 2 will be described below based on the results of the solution composition, solution volume, and Ru distribution ratio of Example 2 in Table 2. In embodiment 2, the concentration of sodium bromate added to the reaction tank solution before the distillation is set to be 221g / L, so that when the 1 equivalent of the oxidation reaction of Ru was 61g / L, the bromic acid in the reaction tank solution after distillation The sodium concentration is 160g / L.

[0054] The concentration of Ru in the reaction tank after distillation was 0.001 g / L or less, and Ru was separated from the reaction tank. Almost all platinum group elements other than Ru remained in the reaction tank, and no platinum group elements other than Ru were contained in the absorption tank. In addition, by providing two stages of absorption tanks, almost all of Ru can be recovered, and Ru can be separated from other platinum group elements.

[0055] Reaction tank before distillation

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Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently separating Ru from a solution containing a platinum group element by oxidation distillation.

SOLUTION: The method for separating and collecting Ru from the solution containing the platinum group element includes adjusting the pH of the solution containing one or more platinum group elements among Ru, Pt, Pd, Rh and Ir to 0.5 to 2.5, converting Ru to ruthenium tetroxide through oxidation with the use of sodium bromate as an oxidizing agent, and distilling the solution, wherein sodium bromate is excessively added in an amount of 1 equivalent weight required for oxidizing Ru into ruthenium tetroxide and further an amount required for adjusting the concentration of sodium bromate to 80 g/L or higher.

COPYRIGHT: (C)2006,JPO&NCIPI

Description

technical field [0001] The present invention relates to a method for separating Ru from a platinum group-containing solution, such as a post-leaching solution of copper electrolytic slime. Background technique [0002] As a method for separating Ru, it is known to utilize ruthenium tetroxide (RuO 4 ) Volatile oxidative distillation method. For example, in the document Japan Atomic Mechanics Journal 28 volumes from page 493 to page 500 (non-patent document 1), it is described that adding oxidant to the residue containing platinum group and dissolving it with alkali, feeding chlorine gas, recovering volatilized The method of ruthenium tetroxide. However, when feeding chlorine gas, the chlorine gas absorbed by the aqueous solution is decomposed into hypochlorous acid and hydrochloric acid to make the solution acidic, so that the oxidative distillation is no longer carried out. Therefore, in order to improve the recovery rate, it is necessary to add alkali to repeat the distil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/20
CPCY02P10/20
Inventor 永井燈文
Owner JX NIPPON MINING & METALS CO LTD
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