Method for recovering molybdenum from waste nickel-molybdenum catalyst

A catalyst, nickel-molybdenum technology, applied in the field of resource recovery, can solve the problems of many impurities, flue gas pollution, difficulties, etc., and achieve the effects of low reaction temperature, low equipment investment and simple operation

Active Publication Date: 2021-10-29
INST OF PROCESS ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method described in it requires high-temperature roasting, which is likely to cause smoke pollution, and the addition of excessive alkaline substances will also increase the difficulty of post-processing
[0006] The above scheme has the problem that there are many impurities in the recovery of molybdenum, which is easy to cause pollution or difficult post-processing. Therefore, it is very necessary to develop a method for recovering molybdenum from spent catalysts with high purity, environmental protection and simple post-treatment.

Method used

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  • Method for recovering molybdenum from waste nickel-molybdenum catalyst

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Embodiment 1

[0037] The waste nickel-molybdenum catalyst selected in this embodiment has a molybdenum mass content of 12.5%, a nickel mass content of 2.4%, an aluminum mass content of 25.4%, and a sulfur mass content of 9.4%, wherein molybdenum mainly exists in the form of molybdenum sulfide, but the crystallinity is relatively poor. Spent catalyst substantially in the form of amorphous alumina.

[0038] The present embodiment provides a kind of method that reclaims molybdenum from waste nickel-molybdenum catalyst, and described method comprises the following steps:

[0039] (1) Use hydrogen peroxide with a mass concentration of 30%, take 40mL, add it to a 500mL three-necked flask, dilute it to 100mL with deionized water, add 20g of spent nickel-molybdenum catalyst, and stir the reaction at 60°C at a stirring speed of 250rpm. 30min to obtain leachate;

[0040] (2) Slowly add ammonia water with a mass concentration of 20% to the leaching solution obtained in step (1), keep the pH at 7.5, r...

Embodiment 2

[0044]The spent nickel-molybdenum catalyst used in this example was washed and deoiled with acetone, and then ground to below 200 mesh. The mass content of molybdenum was measured to be 11.8%, the mass content of nickel was 3.5%, the mass content of sulfur was 10.4%, and the mass content of aluminum was 26.7%.

[0045] The present embodiment provides a kind of method that reclaims molybdenum from waste nickel-molybdenum catalyst, and described method comprises the following steps:

[0046] (1) Take 20 g of finely ground spent catalyst, mix it with 60 mL of deionized water, and put it into a three-necked flask. Add 40 mL of hydrogen peroxide with a mass concentration of 30%, and react at 60°C for 30 minutes to obtain a leaching solution;

[0047] (2) Slowly add ammoniacal liquor with a mass concentration of 20% to the leaching solution obtained in step (1), keep the pH at 7.5, after reacting for 2 hours, filter, and add 30 mL of ammoniacal liquor with a mass concentration of 2...

Embodiment 3

[0050] The only difference between this embodiment and Example 1 is that the addition of hydrogen peroxide in step (1) is 30 mL, (the concentration of hydrogen peroxide after dilution is 9%), and other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides a method for recovering molybdenum from a waste nickel-molybdenum catalyst. The method comprises the following steps: (1) hydrogen peroxide and the waste nickel-molybdenum catalyst are mixed, and one-step reaction is carried out to obtain a leachate; and (2) ammonia water is added into the leachate obtained in the step (1) for a second-step reaction, then ammonia water is added for a third-step reaction, and molybdenum-containing filtrate is obtained after filtration. The method provided by the invention has the advantages of low temperature, no need of using a pressurized reactor, simple operation and low equipment investment. The produced ammonium molybdate solution can be recovered using conventional methods.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and relates to a method for recovering molybdenum from waste nickel-molybdenum catalysts. Background technique [0002] At present, my country's oil refining industry produces 200,000 tons of waste refining catalysts every year, and only about 10% of the waste catalysts are treated as resources, and most of them can only be piled up. Spent catalysts are hazardous wastes, which contain a large amount of harmful substances, and the environmental risk of long-term storage is high. Nickel-molybdenum catalyst is a hydrogenation catalyst commonly used in the oil refining process. It is usually supported by γ-alumina. The molybdenum content can reach more than 10%, and the nickel content is between 3-10%. It mainly exists in the form of sulfide. The remaining elements are mainly iron and silicon in small amounts. This kind of catalyst can be used to extract valuable metals such as molybdenum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B7/00C22B3/04C22B3/44
CPCC22B34/345C22B3/04C22B3/44Y02P10/20
Inventor 张广积李望良李媛媛杨超
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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