Method for extracting high-purity metal palladium from waste palladium-aluminum oxide catalyst

A technology of palladium catalyst and alumina, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and improvement of process efficiency. The effect of less pollution and less waste solids

Active Publication Date: 2018-08-21
河南能源集团研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process is complicated, energy consumption is high, environmental pollution is big, the purity of palladium is not high, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method of extracting high-purity metal palladium from waste palladium-alumina catalyst of the present embodiment, the steps are as follows:

[0024] (1) Weigh 500mL concentrated HCl, dilute it in 1000 mL deionized water, record it as solution A, weigh 150g HCl 2 o 2 , recorded as solution B, weighed a certain amount of ammonia water, recorded as solution C, weighed 11.57g of butyl sodium xanthate and dissolved it in 100mL deionized water, recorded as solution D;

[0025] (2) Weigh 100 g of the waste palladium-alumina catalyst, add solution A to the weighed 100 g of waste palladium-alumina catalyst, then drop into solution B, soak for 12 hours, then filter to obtain the filtrate, drop into the solution D, control the pH value between 8 and 14, and filter to obtain the filtrate, drop into solution A to obtain a solid-liquid mixture, stir for 10 minutes, stand for 2 hours, filter to obtain a filter cake, and dry at 80 ° C for 24 hour, then in a muffle furnace, the te...

Embodiment 2

[0030] The method of extracting high-purity metal palladium from waste palladium-alumina catalyst of the present embodiment, the steps are as follows:

[0031] (1) Weigh 500mL concentrated HCl, dilute it in 1000 mL deionized water, record it as solution A, weigh 150g HCl 2 o 2 , recorded as solution B, weighed a certain amount of ammonia water, recorded as solution C, weighed 11.57g of butyl sodium xanthate and dissolved it in 100mL deionized water, recorded as solution D;

[0032] (2) Weigh 100 g of waste palladium-alumina catalyst, add solution A to the weighed 1000 g waste palladium-alumina catalyst, then drop into solution B, soak for 24 hours, then filter to obtain filtrate, drop into Solution C, control the pH value between 8 and 14, and filter to obtain the filtrate, drop into solution D to obtain a solid-liquid mixture, stir for 10 minutes, let stand for 2 hours, filter to obtain a filter cake, and bake at 100 °C Dry for 24 hours, then heat up to 500°C at a heating r...

Embodiment 3

[0037] The method of extracting high-purity metal palladium from waste palladium-alumina catalyst of the present embodiment, the steps are as follows:

[0038] (1) Weigh 500mL concentrated HCl, dilute it in 1000 mL deionized water, record it as solution A, and weigh 15g NaClO 3 Dissolve in 100mL deionized water, record as solution B, weigh a certain amount of ammonia water, record as solution C, weigh 11.57g of butyl sodium xanthate and dissolve in 100mL deionized water, record as solution D;

[0039] (2) Weigh 1000g of waste palladium-alumina catalyst, add solution A to the weighed 1000 g of waste palladium-alumina catalyst, then drop into solution B, soak for 36 hours, then filter to obtain filtrate, drop into Solution C, control the pH value between 7.5 and 14, and filter to obtain the filtrate, drop into solution D to obtain a solid-liquid mixture, stir for 10 minutes, let stand for 2 hours, filter to obtain a filter cake, and bake at 120 °C Dry for 24 hours, then heat up...

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PUM

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Abstract

The invention discloses a method for extracting high-purity metal palladium from a waste palladium-aluminum oxide catalyst. The method is characterized in that a lixiviation process is adopted for recycling, a mixed solution of diluted hydrochloric acid and a pro-oxidant H2O2 or NaClO3 is adopted, butyl sodium xanthate is taken as a precipitant for precipitating palladium after lixivium is subjected to ammonification, precipitation and impurity removal, and roasting is performed to obtain palladium oxide; and purification is performed by three times or multiple times through processes of dissolving palladium oxide through the mixed solution of diluted hydrochloric acid and the pro-oxidant H2O2 or NaClO3, ammonifying, precipitating and filtering impurities, adding butyl sodium xanthate to precipitate palladium and roasting. The method is simple in process, does not adopt chloroazotic acid, is small in environmentally pollution, is less in waste liquor and waste solid amount, has a palladium recovery rate higher than 99.99%, has metal palladium purity higher than 99.99%, is efficient and environmentally friendly, and greatly reduces recycling cost; and an extracted aluminum oxide ball further can be recycled as a catalyst carrier.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of secondary resources, and relates to the recovery of precious metal palladium from waste palladium catalysts, in particular to a method for recovering high-purity metal palladium from waste palladium-alumina catalysts. Background technique [0002] Palladium is a catalyst often used in chemical and chemical reactions. There are many types of palladium-containing catalysts. Most of them are used in catalytic hydrogenation and catalytic oxidation in petrochemical industry. They have the advantages of high catalytic activity and good selectivity. , making many difficult-to-realize reaction processes possible, palladium is compounded with other metals or co-catalysts, and has better catalytic performance, such as palladium-based catalysts used in hydrogenation reactions, and supported platinum-rhodium-palladium triple-effect catalysts used in automobile exhaust purification Catalyst, Pd-Cu ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00B01J21/04
CPCB01J21/04C22B7/007C22B11/048Y02P10/20
Inventor 张鲁湘穆仕芳宋军超张磊蒋元力魏灵朝徐柳
Owner 河南能源集团研究总院有限公司
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