Method for recovering ruthenium trichloride from ruthenium plating waste liquid

A technology of ruthenium trichloride and waste liquid is applied in the field of recovering ruthenium trichloride in ruthenium plating waste liquid, which can solve the problem of low recovery rate of ruthenium, improve social and environmental benefits, reduce discharge, and reduce secondary The effect of pollution

Active Publication Date: 2019-11-08
JIANGSU UNIV OF TECH
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  • Claims
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Problems solved by technology

[0004] At present, the distillation absorption method is widely used in the technical field of recovery of ruthenium trichloride, and the method is relatively mature, but the recovery rate of ruthenium in the distillation absorption method is not high. Technical problems to be solved in the technical field of ruthenium trichloride in ruthenium waste liquid

Method used

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  • Method for recovering ruthenium trichloride from ruthenium plating waste liquid
  • Method for recovering ruthenium trichloride from ruthenium plating waste liquid
  • Method for recovering ruthenium trichloride from ruthenium plating waste liquid

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Embodiment 1

[0070] The present embodiment provides a method for reclaiming ruthenium trichloride in waste ruthenium plating solution, the method comprising:

[0071] S1-1: Accurately pipette 30ml of waste ruthenium plating solution into a three-necked flask, and slowly add 8ml of sulfuric acid and m 1 =0.8gKMnO 4 , at T 1 = Heating in a water bath at 75°C for t=1h, oxidative distillation of RuO 4 and distillate;

[0072] S1-2: the RuO 4 The gas is absorbed by the HCl solution of n=6mol / L to generate RuCl hydrochloric acid solution;

[0073] S1-3: Distill under reduced pressure at 55°C for 8 hours to obtain β-RuCl 3 ·xH 2 O crystals;

[0074] S2-1: Filter the obtained distillate, discard the filter residue, and obtain the filtrate;

[0075] S2-2: Add NaOH solution to the filtrate to adjust the pH to alkaline, add 5ml of pre-oxidant 10% NaClO and 1g of NaCl, and keep warm in a water bath at 80°C for 30min to obtain a pre-oxidized distillate;

[0076] S2-3: Using sulfonated kerosene...

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Abstract

The invention provides a method for recovering ruthenium trichloride from ruthenium plating waste liquid, and relates to the technical field of noble metal recovery. The method comprises the followingstepsofS1, performing oxidative distillation on the ruthenium plating waste liquid in an acidic medium to obtain the ruthenium trichloride and distilled residual liquid; S2, extracting and back-extracting the distilled residual liquid to obtain a water phase; and S3, performing oxidative distillation on the water phase. According to the method for recovering the ruthenium trichloride from the ruthenium plating waste liquid, the distillation process and the extraction process are combined to further recover the residual ruthenium element in the distilled residual liquid, so that on one hand, the recovery rate of ruthenium trichloride is increased; and on the other hand, discharge of the waste liquid is reduced, secondary pollution to the environment is reduced, and thus, social and economic benefits and environmental benefits are increased.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery, in particular to a method for recovering ruthenium trichloride in ruthenium plating waste liquid. Background technique [0002] Currently, ruthenium trichloride (RuCl 3 ) are widely used in the preparation of metal anode ruthenium coatings, the preparation of hydrogenation catalysts and the production of computer hard disk memory materials. Therefore, a large amount of ruthenium-containing secondary resource wastes have been produced in the above-mentioned production process. [0003] Ruthenium-containing secondary resource waste has a wide range of sources, various types, and complex systems, which can be roughly divided into five categories: ingot-shaped ruthenium alloy waste; filamentous ruthenium alloy waste; flake ruthenium alloy waste; ruthenium-containing cleaning waste in the jewelry production process; Electronic industry waste, liquid waste and anode slime. Ruthenium-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/02C22B7/00
CPCC22B11/021Y02P10/20
Inventor 王琪邵莹陈金益范义春
Owner JIANGSU UNIV OF TECH
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