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Method for recovering platinum group metal and co-producing aluminum oxide concentrate from spent aluminum-based catalyst

A technology of aluminum oxide and platinum group metals, which is used in the improvement of process efficiency and other directions

Inactive Publication Date: 2020-07-14
昆明寰世科技开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for recovering platinum group metal and co-producing aluminum oxide concentrate from spent aluminum-based catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Refer to the accompanying drawings, conditions: take 1000g of the invalid aluminum-based catalyst, mix it with charcoal and ferroferric oxide, the amount of charcoal added is 8% of the weight ratio of the invalid aluminum-based catalyst, and the amount of ferric oxide added is the weight of the invalid aluminum-based catalyst 40%, use a planetary ball mill for mechanical activation, add 1% sodium carboxymethyl cellulose binder and appropriate amount of water to re-moisten the activated material, and use a spherical egg forming machine to make pellets with a diameter of 20mm , to obtain composite pellets and dry them at 150°C; place them in a reduction furnace for low-temperature reduction of composite pellets, the reduction temperature is 1050°C, and the reduction time is 6h. The obtained pellets have a metallization rate of 95.35%, and are subjected to wet ball milling , controlling the grinding concentration to 60%, ball milling for 90min, and magnetic separation with ...

Embodiment 2

[0039] Referring to the accompanying drawings, conditions: take 3000g of the invalid aluminum-based catalyst, mix it with charcoal and ferroferric oxide, the amount of charcoal added is 10% of the weight ratio of the invalid aluminum-based catalyst, and the amount of ferric oxide added is the weight of the invalid aluminum-based catalyst 50%, use a rod mill for mechanical activation, add 1% sodium carboxymethylcellulose binder and an appropriate amount of water to re-moisten the activated material, and use a spherical egg forming machine to make pellets with a diameter of 20mm, the composite pellets were obtained and dried at 150°C; placed in a reduction furnace for low-temperature reduction of the composite pellets, the reduction temperature was 1120°C, and the reduction time was 5h. The obtained pellets had a metallization rate of 95.66%, and were wet Ball milling, controlling the grinding concentration to 70%, ball milling for 60min, and magnetic separation with a magnetic s...

Embodiment 3

[0041] Referring to the accompanying drawings, conditions: take 6000g of the invalid aluminum-based catalyst, mix it with charcoal and ferroferric oxide, the amount of charcoal added is 15% of the weight ratio of the invalid aluminum-based catalyst, and the amount of ferric oxide added is the weight of the invalid aluminum-based catalyst 35%, use a rod mill for mechanical activation, add 1% sodium carboxymethylcellulose binder and an appropriate amount of water to re-moisten the activated material, and use a spherical egg forming machine to make pellets with a diameter of 20mm, the composite pellets were obtained and dried at 150°C; the composite pellets were reduced in a reduction furnace at a low temperature, the reduction temperature was 1000°C, and the reduction time was 6h. The obtained pellets had a metallization rate of 95.14% and were subjected to wet method Ball milling, controlling the grinding concentration to 60%, ball milling for 90min, and magnetic separation with...

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Abstract

The invention discloses a method for recovering platinum group metal and co-producing aluminum oxide concentrate from a spent aluminum-based catalyst. The method comprises the following steps of uniformly mixing the spent aluminum-based catalyst with charcoal and ferroferric oxide, carrying out mechanical activation pretreatment, adding a binder and water to prepare pellets, and carrying out a series of treatments such as carbothermic reduction, ore grinding and magnetic separation, reselection and filter pressing to obtain platinum group metal concentrate and the aluminum oxide concentrate. Byproduct ferric oxide hydrate is magnetized and roasted to obtain the ferroferric oxide, and the ferroferric oxide is returned to a mechanical activation process to be used as a trapping agent; and the residual corrosion liquid is returned to a corrosion process for recycling. By the adoption of the method, the platinum group metal recovery rate is larger than 99.0%, the platinum group metal enrichment ratio is larger than 250 times, the content of aluminum oxide in the obtained aluminum concentrate is larger than 95%, and the aluminum yield is larger than 92%. According to the method, the corrosion liquid and the trapping agent are recycled, the aluminum oxide concentrate is co-produced, waste residues and waste water are not discharged, and the method has the advantages of being high inplatinum group metal yield, large in enrichment ratio, environmentally friendly, high in resource utilization rate and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy of rare and precious metals, and relates to a method for recovering platinum group metals from spent aluminum-based catalysts and coproducing alumina concentrate. Background technique [0002] The invalid aluminum-based catalyst supports mainly include invalid palladium catalysts, invalid platinum catalysts, etc. The carrier is aluminum oxide with a content greater than 98%, and the rest is a small amount of carbon, sulfur, and platinum group metals such as palladium and platinum. Currently, methods for enriching or recovering platinum group metals from spent aluminum-based catalyst supports are as follows: [0003] Ma Su and others disclosed a method for recovering palladium chloride from waste palladium catalysts (application publication number: 201810391939.3), the steps are as follows: finely grind the waste palladium catalysts to a particle size of -0.125 mm; dissolve in acid to obtain a mixed solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B21/00C22B7/00C22B1/248C22B1/02
CPCC22B1/02C22B1/2406C22B1/248C22B7/001C22B7/008C22B11/048C22B21/0076Y02P10/20
Inventor 范兴祥雷鹰李雨李国旺王家和
Owner 昆明寰世科技开发有限公司