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Method for recovering precious metal palladium from aniline tar

A technology for aniline tar and precious metals, applied in the field of resource recycling, can solve problems such as low extraction efficiency and serious environmental pollution

Active Publication Date: 2017-03-08
NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention proposes a scientific, simple, economical and efficient method for recovering precious metal palladium from spent catalysts in aniline tar, to solve the existing extraction methods, serious environmental pollution and low extraction efficiency The problem

Method used

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  • Method for recovering precious metal palladium from aniline tar
  • Method for recovering precious metal palladium from aniline tar
  • Method for recovering precious metal palladium from aniline tar

Examples

Experimental program
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Effect test

Embodiment 2

[0051] Example 2: After the aniline tar raw material is pretreated, adjust the pH to 10, add a self-made precious metal collector, the amount of the collector is 2% of the quality of the aniline tar raw material, and then heat it to 160°C at a constant temperature and continue stirring , After reacting for a certain period of time, let it stand and settle, and take the supernatant to measure the palladium content therein. The test result was 4.25ppm, qualified, cooled and filtered, the filter residue was retained, and the filtrate was incinerated; the obtained filter residue was burned in a muffle furnace, the burning temperature was 600°C, and the burning time was 1h. After the burning is complete, collect and retain the ash; add an appropriate amount of mixed acid to the obtained ash, stir with a glass rod, boil at low temperature to dissolve completely, cool and filter, collect and process the filter residue, and retain the filtrate; Nitrate, then replace. After a period o...

Embodiment 3

[0052] Example 3: After the raw material of aniline tar is pretreated, the pH is adjusted to 10, and a self-made precious metal collector is added. The amount of the collector is 2% of the quality of the raw material of aniline tar, and then heated to 200°C at a constant temperature, and continuously stirred , After reacting for a certain period of time, let it stand and settle, and take the supernatant to measure the palladium content therein. The test result was 4.02ppm, qualified, cooled and filtered, the filter residue was retained, and the filtrate was incinerated; the obtained filter residue was burned in a muffle furnace, the burning temperature was 600°C, and the burning time was 1h. After the burning is complete, collect and retain the ash; add an appropriate amount of mixed acid to the obtained ash, stir with a glass rod, boil at low temperature to dissolve completely, cool and filter, collect and process the filter residue, and retain the filtrate; Nitrate, then rep...

Embodiment 4

[0053] Example 4: After the aniline tar raw material is pretreated, adjust the pH to 10, add a self-made precious metal collector, the amount of the collector is 2% of the quality of the aniline tar raw material, and then heat it to 200°C at a constant temperature, and continue to stir , After reacting for a certain period of time, let it stand and settle, and take the supernatant to measure the palladium content therein. The test result was 4.07ppm, qualified, cooled and filtered, the filter residue was retained, and the filtrate was incinerated; the obtained filter residue was burned in a muffle furnace, the burning temperature was 800°C, and the burning time was 1h. After the burning is complete, collect and retain the ash; add an appropriate amount of mixed acid to the obtained ash, stir with a glass rod, boil at low temperature to dissolve completely, cool and filter, collect and process the filter residue, and retain the filtrate; Nitrate, then replace. After a period o...

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Abstract

The invention relates to a method for recovering precious metal palladium from aniline tar. The method includes the following steps that aniline tar raw materials are heated to 80 DEG C, the PH is adjusted, a precious metal collector is added, constant temperature heating is carried out, stirring is carried out, standing depositing is carried out, cooling and filtering are carried out, filter residues are reserved and burned in a muffle furnace, ash is collected and reserved after burning is complete, mixed acid is added, boiling is carried out after stirring, complete dissolving is carried out, cooling and filtering are carried out, filter residues are collected and treated, filter liquor is reserved and is subject to concentration and nitre expelling, then iron replacement is carried out, cooling and filtering are carried out, filter liquor is subject to secondary recovering, filter residues are reserved and washed until water obtained after washing is neutral, filter residues are dried, coarse palladium is obtained, and the coarse palladium is refined to obtain sponge palladium. The method has the beneficial effects that the problem of losses of the palladium in the burning process is solved, the problem that palladium oxide is generated in the burning process is solved, the metal palladium recovering rate is improved, the recovering cost is reduced, and the recovering period is shortened.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and in particular relates to a method for recovering precious metal palladium from aniline tar. Background technique [0002] Metal palladium is a precious metal with unique physical and chemical properties. It is widely used in electrical instruments, precision alloys, and catalytic reactions in fine chemicals. Because it is very scarce in nature, it is of great importance to recover palladium from various waste catalysts. economic and social benefits. According to the current situation of our country and the forecast of future development, the recovery and production of palladium catalyst in petrochemical industry, polyester industry, automobile environmental protection and other fields will produce huge economic benefits. At present, research on various recovery technologies of waste palladium catalysts has been carried out in China. For example, Shanghai Petrochemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/006C22B11/046Y02P10/20
Inventor 汤立郑奇潘丽陆开化郇昌永邢杨荣
Owner NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION
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