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Method for recycling ammonium molybdate from waste molybdenum catalysts

A catalyst and ammonium molybdate technology, applied in the preparation of molybdenum compounds, chemical instruments and methods, molybdenum compounds, etc., can solve the problems of high operating costs, huge investment in environmental protection, complicated process routes, etc., and achieve the effect of low consumption

Active Publication Date: 2018-05-11
宁夏共宣环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Purpose of the invention: Aiming at the problems of complex process route, huge investment in environmental protection and high operating costs in the existing recovery technology, the present invention discloses a green, pollution-free and low-cost method for recovering ammonium molybdate from spent molybdenum catalysts

Method used

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Examples

Experimental program
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Effect test

specific Embodiment 1

[0044] A method for reclaiming ammonium molybdate from waste molybdenum catalyst, comprises the following steps:

[0045] (1) Sampling analysis

[0046] Take a sample and measure the mass content (wt%) of molybdenum sulfide in the spent molybdenum catalyst, denoted as A;

[0047] (2) Pulverizing the waste molybdenum catalyst and sieving through a 40-mesh sieve to obtain waste molybdenum catalyst powder;

[0048] (3) Put an appropriate amount of ionic liquid into the reactor as the reaction medium, turn on the stirring device of the reactor, and then add B parts by mass of catalyst powder, C parts by mass of ammonia water and D parts by mass of hydrogen peroxide into the reactor, and seal the reaction kettle, heated up to 20°C, and reacted under its own pressure for 4 hours to obtain a reaction product, wherein:

[0049] Amount of ammonia added C=B*A*0.3;

[0050] The amount of hydrogen peroxide added D=4*B;

[0051] (4) the reaction product in step (3) is separated by filtra...

specific Embodiment 2

[0063] A method for reclaiming ammonium molybdate from waste molybdenum catalyst, comprises the following steps:

[0064] (1) Sampling analysis

[0065] Take a sample and measure the mass content (wt%) of molybdenum sulfide in the spent molybdenum catalyst, denoted as A;

[0066] (2) Pulverizing the waste molybdenum catalyst and sieving through a 200-mesh sieve to obtain waste molybdenum catalyst powder;

[0067] (3) Put an appropriate amount of ionic liquid into the reactor as the reaction medium, turn on the stirring device of the reactor, and then add B parts by mass of catalyst powder, C parts by mass of ammonia water and D parts by mass of hydrogen peroxide into the reactor, and seal the reaction kettle, heated up to 200°C, and reacted under its own pressure for 1 hour to obtain a reaction product, wherein:

[0068] The amount of ammonia added C=B*A*0.6;

[0069] The amount of hydrogen peroxide added D = (4 ~ 8) * B;

[0070] (4) the reaction product in step (3) is se...

specific Embodiment 3

[0082] A method for reclaiming ammonium molybdate from waste molybdenum catalyst, comprises the following steps:

[0083] (1) Sampling analysis

[0084] Take a sample and measure the mass content (wt%) of molybdenum sulfide in the spent molybdenum catalyst, denoted as A;

[0085] (2) Pulverizing the waste molybdenum catalyst and sieving through a 100-mesh sieve to obtain waste molybdenum catalyst powder;

[0086] (3) Put an appropriate amount of ionic liquid into the reactor as the reaction medium, turn on the stirring device of the reactor, and then add B parts by mass of catalyst powder, C parts by mass of ammonia water and D parts by mass of hydrogen peroxide into the reactor, and seal the reaction kettle, heated up to 100°C, and reacted under its own pressure for 2 hours to obtain a reaction product, wherein:

[0087] The amount of ammonia added C=B*A*0.45;

[0088] The amount of hydrogen peroxide added D=6*B;

[0089] (4) the reaction product in step (3) is separated ...

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Abstract

The invention relates to a method for recycling ammonium molybdate from waste molybdenum catalysts. The method includes the following steps of 1, conducting sampling and measuring the mass content ofmolybdenum sulfide in the waste molybdenum catalysts; 2, preparing waste molybdenum catalyst powder; 3, adding an appropriate quantity of ionic liquids into a reaction still to serve as a reaction medium, turning on a stirring device of the reaction still, sequentially putting the catalyst powder, ammonium hydroxide and hydrogen peroxide into the reaction still, and closing the reaction still forcarrying out a reaction to obtain a reaction product; 4, filtering and separating the reaction product to obtain a filter cake and a filtrate; 5, conducting extraction separation on the filtrate, thenadding deionized water into the filtrate, extracting ammonium molybdate from the ionic liquids into water to obtain an ammonium molybdate aqueous solution and an ionic solution; 6, placing the ammonium molybdate aqueous solution in a crystallizer for crystallization to obtain ammonium molybdate crystals. The method for recycling ammonium molybdate from the waste molybdenum catalysts has the advantages that the craft process is environmentally friendly and free of pollution, the consumption is low, and the recycling rate of molybdenum is high.

Description

technical field [0001] The invention belongs to the field of recovery and disposal of hazardous solid waste, and in particular relates to a method for recovering ammonium molybdate from waste molybdenum catalysts. Background technique [0002] Molybdenum-based catalysts are widely used in coal liquefaction, petrochemical products (mainly hydrodesulfurization in petroleum refining, hydrodenitrogenation in natural gas processing) and production of synthetic ammonia fertilizers. In the world, tens of thousands of tons of ammonium molybdate industrial raw materials are used to produce molybdenum-based catalysts every year. [0003] Over time, molybdenum-based catalysts gradually lose their effectiveness and eventually turn into solid waste that ends up in landfills. However, if appropriate refining technology is adopted to convert the molybdenum (existing in the form of molybdenum sulfide) in the spent catalyst into an industrial product of ammonium molybdate, better resource a...

Claims

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Application Information

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IPC IPC(8): C01G39/00
CPCC01G39/003C01P2006/80
Inventor 朱学军李洋沈俊
Owner 宁夏共宣环保科技有限责任公司
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