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Method for recovering metal from molybdenum-containing spent catalyst

A waste catalyst and metal technology, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve the problem of large amount of sewage discharged outside, and achieve the effect of improving conversion rate and metal recovery rate

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the process of recovering molybdenum metal by the roasting-organic extraction method includes multiple acid and alkali adjustment steps, and the amount of discharged sewage is relatively large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100 g of 3996 waste hydrogenation catalyst (3996 is a heavy distillate oil hydrocracking pretreatment catalyst developed and produced by Fushun Petrochemical Research Institute) was roasted at 400 ° C for 3 hours to remove oil, and then crushed to 120 mesh after cooling. Obtained 88.4g, and the content of molybdenum and nickel (by weight of oxide) was analyzed to be 22.9% and 3.1%, respectively, and a small amount of silicon and phosphorus were also contained. Mixed with alkaline substances, the amount of sodium carbonate is based on 1 times the amount required for the complete conversion of molybdenum, the mixed powder is crushed and then roasted at 650°C for 10 hours.

[0029] After roasting, the material is leached with water, the liquid-solid weight ratio is 2:1, the temperature is 55°C, the time is 10 hours, the pH value is 9, and then the solid-liquid separation is carried out by filtration. Magnesium sulfate and ammonium sulfate are added to the liquid after sepa...

Embodiment 2

[0037] 100g of 3996 waste hydrogenation catalyst developed and produced by Fushun Petrochemical Research Institute was roasted at 400°C for 4 hours to remove oil, and then crushed to 120 mesh after cooling. Obtained 86.7g, the content of molybdenum and nickel (based on oxide weight) was analyzed to be 23.1% and 2.8% respectively, and a small amount of silicon and phosphorus were also contained. Mixed with alkaline substances, the amount of sodium carbonate is based on 1 times the amount required for the complete conversion of molybdenum, the mixed powder is crushed and then roasted at 650°C for 10 hours.

[0038] After roasting, the material is leached with water, the liquid-solid weight ratio is 2:1, the temperature is 55°C, the time is 10 hours, the pH value is 9, and then the solid-liquid separation is carried out by filtration. Magnesium sulfate and ammonium sulfate are added to the liquid after separation, and the addition amount is based on the generated MgNH 4 PO 3 Pr...

Embodiment 3

[0042] According to the method of embodiment 1, sodium carbonate consumption increases to be 1.5 times of theoretical requirement, and roasting temperature is 700 ℃, and roasting time is 5 hours. The content of nitric acid in the mixed acid is 3%, and the content of lactic acid is 2%. Add alkali to adjust the pH value to 6.8 of the ammonium molybdate solution separated by mixed acid treatment, precipitate and separate aluminum, add alkali to adjust the pH value to 8.9, precipitate and separate nickel compound, and obtain nickel sulfate product after purification and recrystallization. Others are the same as in Example 1, and the molybdenum recovery rate is 97.2%.

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PUM

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Abstract

The invention discloses a method for recovering metal from a molybdenum-containing spent catalyst, which comprises the following steps of: degreasing and crushing the spent catalyst, mixing the spend catalyst and sodium carbonate, and calcining; after calcining, leaching by water, recovering molybdenum from the spent catalyst by adopting an organic extracting agent; and preparing solution of mixed acid by utilizing spent acid discharged in the method to treat solid residues after water leaching, and recovering metal in the spent acid and the residues further. By the method, the recovery rate of the metal in the spent catalyst can be improved further, the severity of the operation condition is lowered simultaneously, and the method has low energy consumption and can be in the metal recovery process of the molybdenum-containing spent catalyst.

Description

technical field [0001] The invention relates to a method for recovering metals from waste catalysts containing molybdenum, in particular to a method for recovering metals from waste hydrogenation catalysts containing molybdenum and nickel. Background technique [0002] With the development of the chemical industry, especially the development of chemical industries such as oil refining and chemical industry that use a large amount of catalysts, a large amount of waste catalysts will be produced. At the same time, with the increasingly stringent environmental regulations, the disposal of these spent catalysts has become an important issue. [0003] Molybdenum is an important part of hydrogenation catalysts and is widely used in petroleum refining industry and nitrogen fertilizer production industry. At the same time, molybdenum also has a large demand in the fields of national defense and steel, and molybdenum ore reserves on the earth's surface are limited. Therefore, from T...

Claims

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Application Information

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IPC IPC(8): C01G39/00C22B7/00
CPCY02P10/20
Inventor 高玉兰陈光王继锋徐黎明李崇慧
Owner CHINA PETROLEUM & CHEM CORP
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