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Method for recovery of palladium from waste palladium-carbon catalyst

A technology of palladium-carbon catalyst and waste catalyst, which is applied in the direction of improving process efficiency, etc., can solve the problems of unsuitable industrial production, environmental pollution, and expensive extraction agent, and achieve the effects of less equipment investment, environmental friendliness, and high palladium recovery rate

Inactive Publication Date: 2008-10-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the reaction process releases NO x , causing environmental pollution
[0012] Patent US4331634 uses sulfuric acid, hydrochloric acid, and nitric acid as removing agents, and oxime as an extractant to extract palladium from acidic solution. The oxime used is hydroxyxime and its derivatives. This extractant is expensive and not suitable for industrial production
[0013] The method of above patent report all has its shortcoming, and rarely has patent report to reclaim palladium from waste palladium charcoal catalyst

Method used

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  • Method for recovery of palladium from waste palladium-carbon catalyst

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Embodiment 1

[0030] After the waste palladium carbon catalyst is mixed with the ashing agent calcium carbonate and slurried evenly, the ratio of the waste catalyst to calcium carbonate is 1-3:1; the liquid-solid ratio of the slurry is 20:1, and it is roasted at a temperature of 600°C After 2 hours, cook the roasted residue with hydrochloric acid at 100°C for 1 hour, then add hydrogen peroxide and cook at 90°C for 2 hours, then filter, then wash the filter residue, and combine the filtrate and washing liquid to adjust the pH value to 6.5- 7.5, at a temperature of 110°C, use formic acid reduction to obtain coarse palladium powder.

Embodiment 2

[0032] After the waste palladium carbon catalyst and the ashing agent calcium carbonate are mixed and slurried uniformly, the ratio of the spent catalyst to calcium carbonate is 1: 1; the liquid-solid ratio of the slurry is 6: 1, and roasting at 400° C. for 7 hours, Then the roasting residue was cooked with hydrochloric acid at 70°C for 4 hours, then added hydrogen peroxide and cooked at 75°C for 6 hours, then filtered, and then the filter residue was washed, and the filtrate and washing liquid were combined to adjust the pH value to 6.5-7.5. At a temperature of 80° C., the recovery rate of the crude palladium powder obtained by reduction with formic acid is 99.99%.

[0033] Example 2

[0034] After the spent palladium carbon catalyst and the ashing agent calcium carbonate are mixed and slurried uniformly, the ratio of the spent catalyst to calcium carbonate is 3: 1; the liquid-solid ratio of the slurry is 20: 1, and roasted at 500° C. for 2 hours, Then cook the roasted resid...

Embodiment 3

[0036]After the spent palladium charcoal catalyst is mixed and slurried evenly with the ashing agent calcium carbonate, the ratio of the spent catalyst to calcium carbonate is 2: 1; the liquid-solid ratio of the slurry is 10: 1, and roasted at 450° C. for 6 hours, Then cook the roasted residue with hydrochloric acid at 900°C for 3 hours, then add hydrogen peroxide and cook at 85°C for 5 hours, then filter, then wash the filter residue, combine the filtrate and washing liquid to adjust the pH value to 7.5, and then add it at 90°C At low temperature, the recovery rate of crude palladium powder obtained by reduction with formic acid is 99.99%.

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Abstract

The invention discloses a method for recycling palladium from the waste palladium carbon catalyst, which relates to a method for recycling the palladium from the waste palladium carbon catalyst by dissolving noble metal directly. The method is characterized in that the recycling procedure comprises the steps that waste palladium carbon catalyst and cineration agent calcium carbonate are mixed to slurry uniformly and then perform the roasting, to ensure that organism and carbon in the waste catalyst are oxidized, the roasting residue is boiled by using chlorhydric acid and then is added into hydrogen peroxide to be boiled and then filtered, then the filter residue is washed, and the filter liquor and the cleaning liquor are combined to adjust the pH value to be 6.5 to 7.5, and then crude palladium powder can be obtained by using the formic acid to reduce. In the method of the invention, the method of dissolving the noble metal is adopted directly to recycle the palladium in the waste palladium carbon catalyst, and a novel process for recycling the palladium powder is proposed. Compared with the traditional art, the method has the advantages that the process is short, the environment is friendly, and the metal recycling rata is high. Because the optimal process parameter is given, the palladium recycling rata is more than 99.50 percent.

Description

technical field [0001] The method for recovering palladium from waste palladium-carbon catalysts relates to a method for recovering palladium in waste palladium-carbon catalysts by directly dissolving precious metals. Background technique [0002] Noble metals and their complexes have many industrial applications such as supported catalysts and performance chemicals in the fine chemicals industry. Metals such as Ag, Au, Pd, Pt, and Rh are used as catalysts for oxidation, hydrogenation, and dehydrogenation reactions in various industrial applications. Typically polymer modified silica, zeolites and / or various clay materials are used as supports for these metals. Coordinating metal complexes of Pd, Pt, and Rh are used as commercial catalysts for hydroformylation and hydrogenation reactions under homogeneous conditions, but due to the difficulty of separating the metal complexes from the product mixture, coordinating metal complexes were developed There is an increasing deman...

Claims

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Application Information

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IPC IPC(8): C22B11/00
CPCY02P10/20
Inventor 李永军武浚辛冰刘会基张静李勇智任保佑张玉祥郭守杰冯燕
Owner JINCHUAN GROUP LIMITED
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