Method for recovering cobalt and manganese from cobalt-manganese catalyst wastes

A cobalt-manganese catalyst and catalyst technology, which is applied in the field of catalyst recovery, can solve the problems of unstable cobalt-manganese ratio stability of waste slag, affecting product purity, etc., and achieves the effects of easy operation, low cost, and cost-saving treatment

Inactive Publication Date: 2018-01-16
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention has the advantages of simple process, low processing cost, high recovery rate, high product added value, and is suitable for large-scale production; but the present invention still has certain shortcomings in the method for reclaiming cobalt-manganese from cobalt-manganese catalyst waste: the recovery method , because the waste slag is unstable, the stability of the cobalt-manganese ratio cannot be fully guaranteed every time. It needs to be confirmed according to the test results, whether the impurities are basically completely removed, which will affect the purity of the product

Method used

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Embodiment 1

[0032] In this embodiment, the oxidation residue discharged during the production process of trimellitic anhydride is selected as the treatment object of this embodiment. After testing, the mass content of cobalt in the oxidation residue is 18wt%, and the mass content of manganese is 21wt%.

[0033] (1) Put 100g of the above oxidation residue into the extraction kettle, then add 200g of hydrochloric acid, stir and heat to 50-90°C, then add 1g of activated carbon with a particle size of 3um-20um, keep warm for 1-3h and filter to obtain cobalt-containing manganese ions The filtrate; After testing, the mass percent concentration of cobalt in the filtrate is 6%, and the mass percent concentration of manganese is 7%;

[0034] (2) Removal of iron ions: add a mixture of 4-methyl-2-pentanone and formaldehyde with a molar mass ratio of 1:1 to the filtrate containing cobalt and manganese ions in step (1) according to the volume ratio of 1:1, fully Stir evenly, separate the liquid after ...

Embodiment 2

[0040] In this embodiment, the oxidation residue discharged during the production process of trimellitic anhydride is selected as the treatment object of this embodiment. After testing, the mass content of cobalt in the oxidation residue is 18wt%, and the mass content of manganese is 21wt%.

[0041] (1) Put 100g of the above oxidation residue into the extraction kettle, then add 200g of hydrochloric acid, stir and heat to 50-90°C, then add 1g of activated carbon, keep warm for 1-3h and filter to obtain a filtrate containing cobalt and manganese ions; after testing, the filtrate The mass percentage concentration of cobalt in the middle is 6%, and the mass percentage concentration of manganese is 7%;

[0042] (2) Neutralization: The filtrate containing cobalt and manganese ions obtained in step (1) is adjusted to PH to 7-8 with saturated aqueous sodium carbonate solution, and a pink solid is precipitated and filtered; after testing, the cobalt content in the filter cake is 30wt% ...

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Abstract

The invention relates to a method for recovering cobalt and manganese from cobalt-manganese catalyst wastes. The method comprises the following steps: (1) extraction of cobalt and manganese salts; (2)removal of iron ions; (3) neutralization; (4) drying; (5) dissolution; and (6) crystallization; or (1) extraction of the cobalt and manganese salts; (2) neutralization; (3) drying; (4) dissolution for removing iron ions; and (5) crystallization. The method for recovering cobalt and manganese from the cobalt-manganese catalyst wastes has the following advantages: the cobalt-manganese catalyst canbe completely recovered, the cobalt and manganese ions in the cobalt-manganese catalyst wastes can be completely recovered basically, and the recovery rate can reach 98% or more; an iron removal process in the recovery method maximally guarantees the purity of the recovered catalyst to ensure that the activity of the recovered catalyst is not affected; and no new wastes are basically generated inthe entire reaction process, an organic phase can be continuously used in a subsequent reaction, and a water phase is directly used in feeding after being dewatered.

Description

technical field [0001] The invention belongs to the field of catalyst recovery, in particular to a method for recovering cobalt-manganese from waste cobalt-manganese catalysts. Background technique [0002] Trimellitic anhydride is an important chemical raw material with high reactivity. It is mainly used in the production of plasticizers for PVC resins, resin paints for polyimides, water-soluble alkyd resins, films, and surfactants. At present, the main method for the industrial production of trimellitic anhydride at home and abroad is the liquid-phase air oxidation of trimellitic benzene. [0003] Liquid-phase air oxidation method of methylene trimethylbenzene: This method was first successfully developed by the American Mid-Century Company, referred to as MC method. In 1962, the American Amoco company first adopted this method to realize industrial production, so it is also called the Amoco method. In this method, acetic acid is used as a solvent, and a soluble substanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00C22B23/00C22B7/00
CPCY02P10/20
Inventor 郑铁江曹圣平孙百亚赵跃俞晔虎姜伟伟
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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