Method for recovering high-purity molybdenum from molybdenum-containing dead catalyst

A waste catalyst, high-purity technology, applied in the direction of improving process efficiency, etc., can solve the problems of low molybdenum recovery rate, insufficient purity of molybdenum, high treatment cost, etc., and achieve the effect of easy complete conversion, simple equipment and high purity

Active Publication Date: 2008-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

The methods described above are very complicated
[0005] In the existing molybdenum-containing waste catalyst recovery technology, there are deficiencies such as low molybdenum recovery rate or insufficient molybdenum purity. In order to achieve high product quality, some processes need to use ion exchange or extraction processes, which makes the process very cumbersome and relatively expensive. high

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] 500 g of the spent hydrogenation catalyst FDS-4 was roasted at 400° C. for 3 hours, and then pulverized to 120 mesh after cooling. Obtained 432.6g, the content of molybdenum and cobalt (based on oxide weight) was analyzed to be 15.4% and 4.8%, respectively. Alkaline preparation, NH in ammonia water (concentration about 28%) 4 The weight ratio of OH to molybdenum in the spent catalyst is 4:1 (the weight is about 270g), and the weight ratio of ammonium bicarbonate to the spent catalyst is 1:1 (the weight is about 70g) in the ammonia water, and the hydrogen peroxide is added to the mixed solution. 6% by weight (weight is about 20g). Add the pulverized powder into the prepared alkaline solution, and mix thoroughly at 40° C. for 2 hours. Filtration, solid-liquid separation, solid roasting at 400°C for 2 hours, impregnation and separation in the same way. Mix the two solutions and adjust the pH to 7.5 with high-concentration nitric acid. If there is aluminum precipitation,...

Embodiment 2

[0029] 500 g of the FDS-4 hydrogenation catalyst was calcined at 500° C. for 4 hours, and then pulverized to 180 mesh after cooling. The obtained 414.2 g were analyzed to have molybdenum and cobalt contents (calculated as oxides) of 16.8% and 5.2%, respectively. Alkaline preparation, NH in ammonia water (about 30% by weight) 4 The weight ratio of OH and molybdenum in the spent catalyst is 6:1 (about 420g in weight), and the weight ratio of molybdenum (by element weight) in ammonium bicarbonate and spent catalyst is added in ammoniacal liquor to 1.5:1 (about 105g in weight), Add hydrogen peroxide and be about 6% (weight is about 26g) of mixed solution weight. Add the pulverized powder into the prepared alkaline solution, and mix thoroughly at 40° C. for 2 hours. Filtration, solid-liquid separation, the solid was roasted at 400°C for 2 hours, and then impregnated and separated by the same method. Mix the two filtrates and add high-concentration nitric acid to adjust the pH to...

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Abstract

The invention relates to a method for recycling the high purity molybdenum from the molybdenum bearing spent catalyst. The method comprises the steps that the molybdenum bearing spent catalyst is roasted and comminuted, then the molybdenum bearing spent catalyst is leach and filter by adopting alkaline solution bearing ammonia, ammonium bicarbonate and oxyful, and the secondary roasting and leaching are performed to the solids after filtration, the twice leaching solution is acidified and the aluminum is precipitated out, then is acidified continuously to precipitate out the molybdenum in the form of molybdic acid, the molybdic acid is dissolved by using ammonia water further, the pH value is adjusted again to obtain ammonium molybdate deposition, and the ammonium molybdate product is obtained after dryness. The method is particularly suitable for the process for extracting the high purity ammonium molybdate with the aluminum based molybdenum-bearing spent catalyst, the operation is simple, the operability is better, and the quality of the prepared product is stable.

Description

technical field [0001] The invention relates to a method for recycling high-purity molybdenum-containing compounds from molybdenum-containing waste catalysts, especially a method for recycling molybdenum from molybdenum-cobalt waste catalysts. technical background [0002] With the development of industry, the human demand for petroleum and petrochemical products is increasing day by day, and the amount of catalysts used to produce various products is also increasing, especially the amount of aluminum-containing catalysts is increasing, such as the processing of various petroleum products. Molybdenum-containing catalysts are widely used in hydrogen processes. At the same time, there is a relative shortage of molybdenum metal resources, but there is also a large demand in the fields of national defense and steel. Therefore, the recovery and treatment of molybdenum in spent catalysts, the rational reuse of resources, and the reduction of environmental pollution caused by spen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B1/02C22B1/14C22B3/14C22B3/22C22B3/46
CPCY02P10/20
Inventor 陈光高玉兰曹凤兰徐黎明李崇慧
Owner CHINA PETROLEUM & CHEM CORP
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