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Method for recovering tungsten from waste catalyst

A waste catalyst and catalyst technology, applied in the direction of improving process efficiency, etc., can solve problems such as low recovery rate, small scale, and no recovery mechanism

Pending Publication Date: 2022-04-05
辽宁东野环保产业开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The recycling of spent hydrogenation catalysts started relatively late in China, and there is no uniform recycling mechanism. The recycling methods mainly include high-pressure acid solution method, oxidative roasting alkali leaching method, ammonia leaching method, etc. Extraction recovery method is also used, but there are generally small-scale, Problems such as low recovery rate, single variety, and environmental pollution

Method used

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  • Method for recovering tungsten from waste catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Send 500kg of waste tungsten-containing catalyst into the rotary kiln, control the roasting temperature at 650°C~750°C, oxidize and roast for 2 hours, then crush it through a ball mill, sieve it through a vibrating screen and pass it through a 100-mesh sieve. NaOH solution leaching, the pH value of the leaching solution is controlled at 9~10 to form a sodium metatungstate solution.

[0027] Add 21wt% magnesium chloride solution to the sodium metatungstate solution, adjust the pH of the liquid to 10 with 25wt% NaOH solution, and carry out precipitation and filtration to remove impurities such as P, As, and Si. Continue to add solid industrial sodium sulfide to the filtrate to make the molybdenum in the filtrate form molybdenum sulfide precipitate and remove by filtration.

[0028] The purified sodium metatungstate solution was extracted by adding 120L mixed reagent (extractant N235: diluent kerosene: No. 7 industrial white oil = 24:75:11 (volume ratio)) to obtain the loa...

Embodiment 2

[0031] Send 560kg of waste tungsten-containing catalyst into the rotary kiln, control the roasting temperature at 650°C~750°C, oxidize and roast for 2 hours, then crush it through a ball mill, sieve it through a vibrating screen and pass it through a 100-mesh sieve, and add the under-screened material to the reaction kettle with 25wt% NaOH solution leaching, the pH value of the leaching solution is controlled to 9~10 to form a sodium metatungstate solution.

[0032] Add 21wt% magnesium chloride solution to sodium metatungstate solution, adjust pH=10 with 25wt% NaOH solution, carry out precipitation and filtration to remove P, As, Si and other impurities. Continue to add solid industrial sodium sulfide to the filtrate to make the molybdenum in the filtrate form molybdenum sulfide to precipitate and remove.

[0033] The purified sodium metatungstate solution was extracted by adding 150L mixed reagent (extractant N235: diluent kerosene: No. 7 industrial white oil = 23:73:10 (volu...

Embodiment 3

[0036] Send 550kg of waste tungsten-containing catalyst into the rotary kiln, control the roasting temperature at 650°C~750°C, oxidize and roast for 2 hours, then crush it through a ball mill, sieve it through a vibrating screen and pass it through a 100-mesh sieve, and add the under-screened material to the reaction kettle with 25wt% NaOH solution leaching, the pH value of the leaching solution is controlled to 9~10 to form a sodium metatungstate solution.

[0037] Add 21wt% magnesium chloride solution to sodium metatungstate solution, adjust pH=10 with 25wt% NaOH solution, carry out precipitation and filtration to remove P, As, Si and other impurities. Continue to add solid industrial sodium sulfide to the filtrate to make the molybdenum in the filtrate form molybdenum sulfide to precipitate and remove.

[0038] The purified sodium metatungstate solution was extracted by adding 120L mixed reagent (extractant N235: diluent kerosene: No. 7 industrial white oil = 25:76:12 (volu...

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Abstract

The invention discloses a method for recycling tungsten from a waste catalyst, and relates to the technical field of recycling tungsten from the waste catalyst. According to the method, an industrial white oil synergist is added in the extraction process by using an organic solvent extraction method, so that the extraction yield of tungsten is increased by 99.6% from the original 90%, the content of WO3 in the final product ammonium metatungstate reaches 91.2% and is superior to the national standard GB / T26033-2010, and the product can be directly used.

Description

technical field [0001] The invention relates to the technical field of recovering tungsten from waste catalysts, in particular to a method for recovering tungsten from waste catalysts. Background technique [0002] The catalysts used in the process of petroleum desulfurization and hydrogenation are mainly RN-1 and 3581. When the catalyst is used for a period of time, the activity drops and needs to be replaced. The replaced spent catalyst contains valuable metal tungsten (WO 3 Total) content is about 15%, which is a valuable resource. After being used for a period of time, tungsten-containing catalysts must be replaced due to the decline in catalytic activity. As a rare metal, tungsten has limited resources, so recycling is of great significance. [0003] The recycling of spent hydrogenation catalysts started relatively late in China, and there is no uniform recycling mechanism. The recycling methods mainly include high-pressure acid solution method, oxidative roasting alka...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B1/02C22B3/12C22B3/28C22B3/44C22B7/00
CPCY02P10/20
Inventor 李宇增李心缘李文慧栗筝冉德华赵雨萱许倩刘秀梅刘思宇何显勇
Owner 辽宁东野环保产业开发有限公司
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