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Method for preparing molybdic acid by using waste catalyst

A waste catalyst, molybdic acid technology, applied in the direction of improving process efficiency, can solve the problems of complex metal element recovery process, and achieve the effect of easy popularization and application and high metal recovery rate

Pending Publication Date: 2022-01-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also has the disadvantage of complex recovery process of metal elements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Take the spent catalyst crushed to more than 500 mesh, and roast it at 730°C for 9 hours in an air atmosphere;

[0028] (2) Weigh 50 grams of the above spent catalyst and 260 grams of ammonium bicarbonate, add 800 grams of distilled water to the above materials and stir for 20 minutes, transfer the mixed materials into an autoclave and raise the temperature to 140°C for hydrothermal treatment for 6.5 hours. After hydrothermal treatment, the material was filtered, and the filtrate was left to stand at 5°C for 100 hours. The filtrate after standing was filtered to obtain crystals B and solution C. Crystals B were determined to be ammonium vanadate crystals by XRD, and solution C was chemically Titration and ion chromatography were determined to be molybdenum-containing solution;

[0029] (3) Add concentrated nitric acid solution to solution C in step (3), control the pH value of the solution to 1.7 to precipitate precipitates, and after the precipitates are washed and...

Embodiment 2

[0031] Same as Example 1, except that the mesh number of the spent catalyst is 600 mesh, the roasting temperature is 840°C, the amount of ammonium bicarbonate added is 320 grams, the hydrothermal treatment temperature is 150°C, the treatment time is 5.5 hours, and the filtrate standing temperature is 8°C , the standing time was 75 hours, the concentrated nitric acid was changed to concentrated sulfuric acid, and the pH value of the control solution was 2.3; after calculation, the recovery rate of molybdenum in the spent catalyst after treatment was 90.1%, and the recovery rate of vanadium was 89.4%.

Embodiment 3

[0033] Same as Example 1, except that the mesh number of the spent catalyst is 800 mesh, the roasting temperature is 780°C, the ammonium bicarbonate addition is 355 grams, the hydrothermal treatment temperature is 130°C, the treatment time is 7.5 hours, and the filtrate standing temperature is 10°C , the standing time was 140 hours, and the pH value of the control solution was 2.6. After calculation, the recovery rate of molybdenum in the spent catalyst after treatment was 92.3%, and the recovery rate of vanadium was 91.5%.

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PUM

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Abstract

The invention discloses a method for preparing molybdic acid by using a waste catalyst, which comprises the following steps: (1) crushing a waste heavy oil hydrogenation catalyst to a certain particle size, and then roasting to obtain a material A; (2) uniformly mixing the material A, ammonium bicarbonate and water, transferring the mixed material into a pressure-resistant container, carrying out hydrothermal treatment, then carrying out solid-liquid separation, standing the separated liquid phase for a period of time, separating out a precipitate B from the solution, and separating out the precipitate B to obtain a molybdenum-containing solution; and (3) adjusting the pH value of the molybdenum-containing solution to 1-3, separating out a precipitate C, and washing the precipitate C to remove impurities so as to obtain molybdic acid. According to the method, other metal components of the waste catalyst are recycled while molybdic acid is prepared, the process is simple, the investment cost is low, and environmental protection is achieved.

Description

technical field [0001] The invention relates to a method for preparing molybdic acid by utilizing waste catalyst. Background technique [0002] With the advancement of modern science and technology, human beings' demand for high-tech materials is increasingly inseparable from the development of petroleum and chemical industries. Among them, the use of catalyst has played a huge role in the rapid development of petroleum industry and chemical industry. With the prolongation of the catalyst's service time, due to poisoning, sintering and thermal deactivation, coking and clogging, the composition and structure of the catalyst itself have changed, which will eventually lead to a decrease in catalyst activity or failure and cannot continue to be used. It has to be replaced with a new one. catalyst, thus producing a large amount of spent catalyst. If these waste catalysts are piled up randomly without disposal, on the one hand, it will occupy a large amount of land resources and...

Claims

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Application Information

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IPC IPC(8): C22B34/34C22B1/02C22B7/00
CPCC22B34/345C22B1/02C22B7/008Y02P10/20
Inventor 郭士刚季洪海凌凤香王少军谷明镝
Owner CHINA PETROLEUM & CHEM CORP
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