Method for recovering platinum metal from waste catalyst

A platinum group metal and waste catalyst technology, applied in the direction of improving process efficiency, can solve the problems of large acid consumption, high viscosity and high concentration of aluminum sulfate solution, and achieve simplified process operation, low aluminum salt content, and easy filtration and separation. Effect

Inactive Publication Date: 2015-01-07
KUNMING INST OF PRECIOUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the acid consumption is large, the concentration of aluminum sulfate solution is...

Method used

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  • Method for recovering platinum metal from waste catalyst

Examples

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Effect test

Embodiment 1

[0017] Example 1, the waste palladium / alumina catalyst was roasted at 600° C. for 1.5 h, after cooling, 100 kg of material (containing palladium 2240 g / t) was placed in a soaking tank covered with a filter cloth at the bottom, and the mass concentration was 2% Soak in the hydrazine hydrate solution for 3 hours, release the solution, then add 3mol / L hydrochloric acid, 30g / L sodium chlorate mixed solution and soak for 24 hours, release the palladium-containing solution; continue to add 3mol / L hydrochloric acid, 30g / L chlorine Immerse in the mixed solution of sodium bicarbonate for 24 hours to release the palladium-containing solution; combine the soaking solutions twice, adjust the acidity of the solution to 3mol / L with hydrochloric acid, add aluminum block for replacement, and obtain crude palladium, obtain 219.82g of palladium sponge by dissolving and refining, and recover Yield 98.13%, purity 99.95%

Embodiment 2

[0018] Example 2, the spent palladium / alumina catalyst is roasted at 600°C for 2h, after cooling, take 100kg of material (containing palladium 2240g / t) and place it in a soaking tank with a filter cloth at the bottom, and add a mass concentration of 2% Soak in hydrazine hydrate solution for 3 hours, release the solution, then add 4mol / L hydrochloric acid, 30g / L sodium chlorate mixed solution, soak for 24 hours, release palladium-containing solution; continue to add 4mol / L hydrochloric acid, 30g / L chloric acid Soak in the sodium mixed solution for 12 hours to release the palladium-containing solution; continue to add 3mol / L hydrochloric acid and 20g / L sodium chlorate mixed solution to soak for 12 hours to release the palladium-containing solution; combine the soaking solutions for 3 times, and adjust the acidity of the solution with hydrochloric acid 3mol / L, add aluminum block to replace, obtain crude platinum group metals, obtain 221.3g of sponge palladium by dissolving and ref...

Embodiment 3

[0019] Example 3, the waste platinum rhenium / alumina catalyst was roasted at 600°C for 2 hours, after cooling, 50kg of material (containing about 0.44% platinum) was placed in a immersion tank covered with filter cloth at the bottom, and the mass concentration was 2% Soak in the sodium formate solution for 2 hours, release the solution, then add 6mol / L hydrochloric acid, 20g / L sodium chlorate mixed solution, soak for 12 hours, release the platinum-containing solution; continue to add 4mol / L hydrochloric acid, 20g / L chloric acid Soak in the sodium mixed solution for 12 hours to release the platinum-containing solution; continue to add 3mol / L hydrochloric acid and 20g / L sodium chlorate mixed solution to soak for 12 hours to release the platinum-containing solution; combine the soaking solutions for 3 times, and adjust the acidity of the solution with hydrochloric acid 3 mol / L, add aluminum blocks to replace, obtain crude platinum group metals, and obtain 217g sponge platinum by d...

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Abstract

The invention discloses a method for recovering platinum metal from a waste catalyst. The method comprises the following steps: (1) roasting pretreatment: roasting the waste catalyst at a certain temperature to remove surface carbon deposits and other organic matters; (2) normal-temperature immersion: placing the pretreated waste catalyst in a soaking pool, adding a certain amount of reducing solution for immersion, adding an oxidizing solution, and performing repeated immersion for many times to obtain a platinum metal-containing solution; (3) metal replacement: regulating the acidity of the platinum metal-containing solution, adding reducing metal for replacement, and performing solid-liquid separation to obtain crude platinum metal; (4) refining of the platinum metal: dissolving, refining and purifying the crude platinum metal to obtain high-purity platinum metal. According to the method, the recovery rate of the platinum metal is higher than 98 percent, and the purity of the platinum metal is 99.95 percent; an alumina carrier waste platinum metal catalyst in the industries of petroleum, fine chemistry and the like can be treated, and a process is simple and easy to industrially implement.

Description

technical field [0001] The invention relates to a method for recovering platinum group metals from waste catalysts, in particular to a method for recovering platinum group metals from waste platinum group metal catalysts on alumina carriers in petrochemical, fine chemical and other industries. Background technique [0002] The catalysts used in petroleum, chemical and other fields are mainly supported catalysts, and the active components that play a catalytic role are platinum group metals. The alumina carrier provides a huge surface area, and then the catalytically active components (platinum group metals or (and) other metals) are loaded on the surface of the carrier by impregnation, spraying or other methods to form highly dispersed catalytic active centers. After long-term use of alumina-supported catalysts, due to the influence of various harmful impurities, the catalyst gradually loses its activity and is scrapped. Although the content of platinum group metals in the c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 董海刚赵家春崔浩王亚雄童伟锋吴晓峰李博捷吴跃东杨海琼保思敏
Owner KUNMING INST OF PRECIOUS METALS
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