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Manufacturing method for ruthenium crystallization precipitate

A technology for crystallization and manufacturing method, applied in chemical instruments and methods, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, inorganic chemistry, etc., can solve the problems of poor dehydration, time-consuming filtration, etc., and achieve low water content , good filtering effect

Inactive Publication Date: 2007-09-05
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Adopt above-mentioned method, the ammonium hexachlororuthenate obtained by the hydrochloric acid solution of ruthenium, if the water content of filtrate is high when filtering, then there is dehydration poor, and the problem that filtering takes time

Method used

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  • Manufacturing method for ruthenium crystallization precipitate
  • Manufacturing method for ruthenium crystallization precipitate
  • Manufacturing method for ruthenium crystallization precipitate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Next, examples of the present invention will be described. Fig. 1 shows the flow of the embodiment. Table 1 shows the test conditions of Examples and Comparative Examples, and Table 2 shows the test results of Examples and Comparative Examples. Chloride and volatilize the copper electrolytic precipitate in a chlorine atmosphere, add sodium chloride, and perform chlorination and roasting to make platinum group metals into soluble salts, which are dissolved in water to form an aqueous solution. Sodium bromate was added thereto to convert ruthenium into volatile ruthenium tetroxide, which was distilled and recovered as a hydrochloric acid solution of ruthenium in a hydrochloric acid solution of 8.4 mol / L.

[0029] A hydrochloric acid solution containing 50 g / L ruthenium was heated at 90° C. for 4 hours, and 2.8 equivalents of ammonium chloride required to generate ammonium hexachlororuthenate was added at 90° C. At this time, it is added a little at a time so as not to l...

Embodiment 2

[0034] In Example 2, ammonium hexachlororuthenate was produced in the same manner as in Example 1, except that the hydrochloric acid solution containing 50 g / L ruthenium was heated at 90° C. for 4 hours and ammonium chloride was added.

[0035] Good filterability. The filtered ammonium hexachlororuthenate is a reddish black powder with a water content of 17.2%. The loss rate calculated from the amount of filtrate and the ruthenium concentration in the filtrate is small, less than 1%.

Embodiment 3

[0037] In Example 3, ammonium hexachlororuthenate was produced in the same manner as in Example 1, except that the hydrochloric acid solution containing 50 g / L ruthenium was heated at 90° C. for 8 hours and ammonium chloride was added.

[0038] Good filterability. The filtered ammonium hexachlororuthenate is a reddish black powder with a water content of 11.6%. The loss rate calculated from the amount of filtrate and the ruthenium concentration in the filtrate is small, less than 1%.

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Abstract

The present invention provides a process for fabricating high-purity ruthenium separated material by crystallization with excellent filterability and low moisture percentage. In the working procedure of adding ammonium chloride into hydrochloric acid solution of ruthenium to prepare ammonium hexachlororuthenate, the hydrochloric acid solution of ruthenium is kept at 80-95 DEG C for more than 3 h, ammonium chloride is added therein, then the solution is kept at 85-95 DEG C for more than 1 h to get precipitation of ammonium ruthenium hydrochloride, and then the moisture level is reduced to lower than 20 wt% after filtration.

Description

technical field [0001] The present invention relates to a method for producing ruthenium crystal precipitates from a hydrochloric acid solution containing ruthenium. Background technique [0002] As a method for refining and reclaiming ruthenium, it is known to utilize ruthenium tetroxide (RuO 4 ) Volatile oxidative distillation or solvent extraction. For example, as in the document "Platinum Groups and Industrial Utilization, Pages 260 to 262" (Non-Patent Document 1), the oxidative distillation method is to add oxidants such as chlorine or sodium bromate to an aqueous solution containing ruthenium to generate volatile four For ruthenium oxide, ruthenium tetroxide is separated by distillation, introduced into a 6N hydrochloric acid solution kept at 70°C to 80°C, and after 2 to 3 hours, hexachlororuthenate H 2 RuCl 6 . If ammonium chloride is added therein, once it is heated, it will generate ammonium hexachlororuthenate ((NH 4 ) 2 RuCl 6 ). Because the solubility of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
Inventor 永井灯文
Owner JX NIPPON MINING & METALS CO LTD