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Method for recovering platinum from waste catalyst

A waste catalyst and abrasive technology, which is applied in the direction of improving process efficiency, can solve the problems of low cost, high reagent consumption, and low recovery rate, and achieve the effects of reducing the cost of three wastes treatment, reducing equipment loss, and reducing production costs

Inactive Publication Date: 2015-02-11
上海派特贵金属环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing recovery methods mainly include: mechanical stripping method, which consumes less reagents and is low cost, but the metal is dispersed and the process is difficult; smelting method, this method is simple and low cost, but the recovery rate is not high and energy consumption is large ; Carrier dissolution method, this method is simple, but consumes a lot of reagents and requires high equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Grind the waste catalyst into fine particles, put the ground waste catalyst into a muffle furnace and roast for 1 hour at a temperature of 400°C. After cooling, mix the above-treated waste catalyst and abrasive sodium hydroxide into an autoclave Sealed wet grinding, the ratio of catalyst to grinding agent is 8:1, the wet grinding temperature is 150°C, and when the temperature reaches 140°C, oxygen is blown into the kettle. The wet-milled raw materials are vacuum filtered to separate the solid from the liquid, and the leaching residue and leaching liquid are put into an autoclave together. The leaching liquid is 5% NaCN solution, the leaching heating temperature is 140°C, and the pressure is 1.6 MPa. The leaching rate of platinum was 90%.

Embodiment 2

[0024] Grind the waste catalyst into fine particles, put the ground waste catalyst into a muffle furnace and roast for 1 hour at a temperature of 400°C. After cooling, mix the above-treated waste catalyst and abrasive sodium hydroxide into an autoclave Sealed wet grinding, the ratio of catalyst to grinding agent is 8:1, the wet grinding temperature is 170°C, and when the temperature reaches 160°C, oxygen is blown into the kettle. The wet-milled raw materials are vacuum filtered to separate the solid and liquid, and the leaching residue and leaching liquid are put into an autoclave together. The leaching liquid is 5% NaCN solution, the leaching heating temperature is 160°C, and the pressure is 2MPa. Measured after cooling The platinum leaching rate was 94%.

Embodiment 3

[0026] Grind the waste catalyst into fine particles, put the ground waste catalyst into a muffle furnace and roast for 1 hour at a temperature of 500°C. After cooling, mix the above-treated waste catalyst and abrasive sodium hydroxide into an autoclave Sealed wet grinding, the ratio of catalyst to grinding agent is 10:1, the wet grinding temperature is 200°C, and when the temperature reaches 170°C, oxygen is blown into the kettle. The wet-milled raw materials are vacuum filtered to separate the solid from the liquid, and the leaching residue and leaching liquid are put into an autoclave together. The leaching liquid is 7% NaCN solution. The leaching heating temperature is 140°C and the pressure is 1.6-2 MPa. The measured platinum leaching rate was 93%.

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Abstract

The invention discloses a method for recovering platinum from a waste catalyst. The method is characterized by comprising the following steps: (1) grinding: the waste catalyst is grinded to fine particles; (2) charking: the grinded waste catalyst is roasted for 1 hour; and the roasting temperature is 400-600 DEG C; (3) wet grinding: the treated waste catalyst and a grinding agent are mixed and put in an autoclave for sealing and wet grinding; and the ratio of the catalyst to the grinding agent is 8-10: 1; (4) leaching: the vacuum filtration is performed after the wet grinding to separate solids from liquid; and leaching residues and leaching liquid are put in the autoclave for pressurizing and heating; (5) the refined purification is performed. The method has the following beneficial effects: compared with a traditional recovery method, the method omits a step of acid dissolving in the recovery process, so that the cost is saved, the equipment loss is reduced, the three-waste treatment cost is reduced, and the purposes of reducing the production cost and reducing the production period are finally achieved.

Description

technical field [0001] The invention relates to the field of noble metal catalyst recovery, in particular to a method for recovering platinum from spent catalysts. Background technique [0002] Platinum group metals have a wide range of applications and are known as "the vitamins of modern industry" and "the first high-tech metals". Among them, platinum is the most widely used and the most used. Mainly used in chemical and petrochemical catalysts; catalytic purification of automobile exhaust gas; platinum jewelry; temperature measuring components; [0003] In 1875, since the industrialization of the process of producing sulfuric acid by the contact method using platinum as a catalyst, the industrial application of precious metal catalysts has emerged in an endless stream. In 1913, platinum catalytic net was used for ammonia oxidation to produce nitric acid; in 1937, Ag / Al 2 o 3 Catalysts for the oxidation of ethylene to ethylene oxide; 1949, Pt / Al 2 o 3 Catalysts are u...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 刘仕佳
Owner 上海派特贵金属环保科技有限公司
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