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Method for reclaiming metals from molybdenum-containing waste catalyst

A waste catalyst and metal technology, which is applied in the field of metal recovery from waste hydrogenation catalysts containing molybdenum and nickel, can solve environmental pollution and other problems, and achieve the effects of reducing costs, uniform temperature distribution, and avoiding local excessive temperature

Active Publication Date: 2012-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above-mentioned waste catalyst is roasted to remove oil and carbon, the sulfur in it will be converted into sulfur dioxide, which will cause serious environmental pollution if it is not treated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 3996 waste hydrogenation catalyst (3996 is a heavy distillate oil hydrocracking pretreatment catalyst developed and produced by Fushun Petrochemical Research Institute. The final waste catalyst contains carbon and sulfur, etc.) 100g is added with magnesium oxide at 1.2 times the required amount of magnesium sulfite according to the conversion of sulfur, and roasted at 450°C for 3 hours, and then pulverized to 120 mesh after cooling, and then mixed with sodium carbonate Mixing, the amount of sodium carbonate is based on 1.1 times of the required amount when the molybdenum is completely converted, and the mixed powder is roasted at 700 ° C for 10 hours.

[0025] After roasting, the material is leached with water, and ammonia water is added according to the amount of phosphorus completely precipitated in the spent catalyst, the liquid-solid weight ratio is 2:1, the temperature is 55°C, the time is 10 hours, the pH value is 9.5, and then the solid-liquid separation is carrie...

Embodiment 2

[0030] 100g of the 3996 waste hydrogenation catalyst developed and produced by Fushun Petrochemical Research Institute was oxidized at 1.2 times the amount required for the complete conversion of sulfur into magnesium sulfite, roasted at 450°C for 3 hours, cooled and crushed to 120 mesh, and then mixed with Sodium carbonate is mixed, and the amount of sodium carbonate is based on 1.1 times of the required amount when the molybdenum is completely converted, and the mixed powder is roasted at 700 ° C for 10 hours.

[0031] After roasting, the material is leached with water, and ammonia water is added according to the amount of phosphorus in the spent catalyst that has completely precipitated, the liquid-solid weight ratio is 2:1, the temperature is 55°C, the time is 10 hours, the pH value is 9.5, and then the solid-liquid separation is carried out by filtration. The separated liquid was extracted by adding 98% concentrated sulfuric acid to adjust the pH value to 0.01. The extrac...

Embodiment 3

[0034] According to the method of embodiment 1, magnesium oxide is changed into magnesium carbonate, and the amount of magnesium carbonate is increased to 1.5 times of the theoretical requirement, and the degreasing and decarbonizing roasting temperature is 550 ℃, and the roasting time is 5 hours. Others are the same as in Example 1, and the molybdenum recovery rate is 95.7%.

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Abstract

The invention discloses a method for reclaiming metals from a molybdenum-containing waste catalyst, which comprises the following steps of: mixing the waste catalyst and a magnesium-containing compound, roasting, degreasing, removing carbon, then crushing, mixing the powder and sodium carbonate, roasting the mixture, and leaching the roasted materials by using aqueous solution, wherein ammonium salt or aqueous ammonia is added in the aqueous solution leaching step, the molybdenum in the waste catalyst enters the solution in a form of sodium molybdate or ammonium molybdate, the impurities suchas silicon, phosphorus and the like entering the aqueous solution form sediment, and the sediment is kept in solid residue in a filtration step; and after the solid is separated, performing acidification, extraction, re-extraction and the like to reclaim the molybdenum and other metals. The method solves the pollution problem caused by sulfur dioxide in the discharged gas in the roasting, degreasing and carbon removal processes; and the salts formed by the reclaimed sulfur and magnesium can play a role in removing impurities in the subsequent steps so as to save the consumption of chemical reagents in the metal reclaiming process and reduce the cost. In addition, the method reduces the operation steps, reduces equipment, improves the operation effect, and also can improve the molybdenum yield.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/26C22B3/40C22B3/28C22B3/38C22B34/34
CPCY02P10/20
Inventor 高玉兰王继锋陈光徐黎明李崇慧
Owner CHINA PETROLEUM & CHEM CORP
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