Method for dissolving platinum group metals in automobile spent catalyst enrichment

A technology of invalid catalysts and platinum group metals, which is applied in the direction of improving process efficiency, can solve the problems of low dissolution efficiency of platinum group metals, shorten the process flow, and consume large reagents, achieve significant environmental and economic benefits, and shorten the process flow , the effect of simplifying the operation

Inactive Publication Date: 2014-01-22
昆明贵研催化剂有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low dissolving efficiency of platinum group metals in the enrichment of exhausted automobile catalysts, large consumption of reagents, and heavy burden on environmental protection, a new method for dissolving platinum group metals in the enrichment of e

Method used

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  • Method for dissolving platinum group metals in automobile spent catalyst enrichment

Examples

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Effect test

Embodiment 1

[0021] Example 1 The contents of platinum group metals in the enrichment of an automobile exhausted catalyst are (g), Pt661.13, Pd2217.63, Rh349.48, ∑PGMs: 3228.23, and the enrichment is calculated according to the solid-liquid ratio (S , L)=1:1~1:4 Add 8mol / L hydrochloric acid, heat to 70~80℃, add 10%~30%H dropwise 2 O 2 solution, control the dropping rate of 7-8L / h, and heat the reaction for 2-3h. After 2 times of dissolution, sampling and analysis: the dissolution rate of platinum is 99.80%, the dissolution rate of palladium is 99.40%, the dissolution rate of rhodium is 98.98%, and the total dissolution rate of platinum group metals is 99.57%.

Embodiment 2

[0022] Example 2 The contents of platinum group metals in the concentrate of an automobile spent catalyst are (g), Pt10109.0, Pd3325.40, Rh475.30, ∑PGMs: 4819.70, respectively. Add 10mol / L hydrochloric acid to the enriched material according to the solid-liquid ratio (S, L)=1:1~1:8, after heating to 80~90℃, add 5%~20% HClO solution dropwise to control the dropping rate 8~10L / h, heating reaction for 4~5h. After 2 times of dissolution sampling and analysis, the dissolution rate of platinum was 99.41%, the dissolution rate of palladium was 99.30%, the dissolution rate of rhodium was 99.08%, and the total dissolution rate of platinum group metals was 99.30%.

Embodiment 3

[0023] Example 3 The contents of platinum group metals in the enrichment of an automobile exhausted catalyst are respectively (g), Pt2585.30, Pd7651.10, Rh1227.10, ∑PGMs11463.50. Add 12mol / L hydrochloric acid to the enriched product according to the solid-liquid ratio (S, L)=1:1~1:10, and after heating to 90~100℃, add 10%~20% HClO dropwise 4 solution, control the dropping rate of 10-20L / h, and heat the reaction for 4-6h. After three times of dissolution, sampling and analysis, the dissolution rate of platinum was 99.50%, the dissolution rate of palladium was 99.86%, the dissolution rate of rhodium was 99.46%, and the total dissolution rate of platinum group metals was 99.74%.

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Abstract

The invention relates to a method for recovering platinum group metals from automobile spent catalysts and in particular relates to a method for dissolving platinum group metals in automobile spent catalyst enrichment. The method comprises the following steps: after pretreating the enrichment which contains platinum group metals and is obtained by enriching the automobile spent catalysts, adding oxidants to hydrochloric acid media so that the platinum group metals are fully and quickly dissolved and transferred to a solution, and treating insoluble substances after being filtered. The method has the advantages of high platinum group metal recovery rate, short flow, low environmental protection pressure, low cost and the like.

Description

technical field [0001] The invention relates to a method for extracting platinum group metals from automobile spent catalysts, and particularly provides a method for dissolving platinum group metals in the enrichment of automobile spent catalysts. Background technique [0002] Platinum group metals have many unique and excellent physical and chemical properties. Among all metal elements, they have the best oxidation resistance and corrosion resistance, and are widely used in modern industry. Among them, platinum group metal catalysts are the largest use of platinum group metals. my country's proven platinum group metal resources are few and of low grade, and the contradiction between supply and demand is extremely prominent. The production cost of recovering platinum group metals from spent catalysts is many times lower than that of primary metals, which can reduce a lot of energy consumption and harm to the environment. Therefore, recovery of platinum group metals from spe...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 毕向光余建民王火印卢军赵云昆李权杨金富
Owner 昆明贵研催化剂有限责任公司
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