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Method for extracting molybdenum from waste nickel-molybdenum catalyst

A waste catalyst and catalyst technology, applied in the direction of improving process efficiency, can solve the problems of high aluminum content, difficult separation of molybdenum and aluminum, etc., and achieve the effects of high recovery rate, easy crushing, and low environmental pollution

Active Publication Date: 2018-11-02
XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that the content of aluminum in the leaching solution is high, the separation of molybdenum and aluminum is difficult, and the leaching solution needs to be purified, and the comprehensive recovery rate of molybdenum is 80% to 85%.

Method used

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  • Method for extracting molybdenum from waste nickel-molybdenum catalyst
  • Method for extracting molybdenum from waste nickel-molybdenum catalyst
  • Method for extracting molybdenum from waste nickel-molybdenum catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: Put the waste nickel-molybdenum catalyst to be treated into an electric heating type roaster for a period of low-temperature oxidation roasting, the roasting temperature is 600°C, and the roasting time is 2h, and the carbon and sulfur deposits on the spent catalyst are burned, and at the same time, the The valuable metal sulfides in the spent catalyst are converted into valuable metal oxides; the flue gas is introduced into the spray alkali scrubber through the fan to remove SO 2 smoke.

Embodiment 2～ Embodiment 4

[0032] Examples 2 to 4: According to the calcination process of Example 1, different calcination results were obtained by changing the calcination temperature and calcination time, see Table 3.

[0033] The roasting result of table 3 embodiment 1~embodiment 4

[0034]

Embodiment 5

[0037] (1) Under normal pressure, dissolve part of the roasted material obtained in Example 2 in sodium carbonate solution for the first step of leaching, and leaching for 3 hours at 85°C and a stirring speed of 800rpm, the first step of leaching the concentration of lye 30g·L -1 , the liquid-solid ratio is 3:1, after leaching, the ore slurry is filtered to obtain the first step leaching slag and the leaching solution containing molybdenum and aluminum;

[0038] (2) Under normal pressure, dissolve the leaching slag obtained in step (1) in the first step in alkaline solution again for the second step of leaching, leaching at 85°C and a stirring speed of 800rpm for 3 hours, and the second step of leaching Take the lye concentration as 15g L -1 , the liquid-solid ratio is 3:1, after leaching, the ore slurry is filtered to obtain nickel-aluminum slag and the second step leaching solution;

[0039] (3) Under normal pressure, add part of the roasted material obtained in Example 2 ...

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Abstract

The invention discloses a method for extracting molybdenum from a waste nickel-molybdenum catalyst. The method comprises the specific steps that organic matter, sulphur, heavy metal arsenic and the like which are attached to the catalyst are removed through oxidation volatilization by means of low temperature roasting, then circulation two-stage ordinary pressure alkali leaching is adopted for achieving separation of nickel from molybdenum aluminum, sodium molybdate crude liquid is obtained and is subjected to heating, evaporation and concentration, cooling crystallization is carried out, andfiltering and separating are carried out to obtain a sodium molybdate product. According to the method, no reagent needs to be added in the roasting process, corrosion to roasting equipment is small,the operation condition is mild, the environmental pollution is small, comprehensive recovering and using of valuable metal in the catalyst are achieved, the sodium molybdate product is obtained, therecovering rate of the valuable metal is high, the product additional value is high, and a certain application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and relates to the recovery of rare metals, in particular to a method for extracting molybdenum from waste nickel-molybdenum catalysts. Background technique [0002] Nickel-molybdenum catalyst is one of the most important catalysts in the petroleum refining industry, mainly used for hydrodesulfurization, hydrodenitrogenation, hydrodemetallization and hydrocracking, etc. This type of catalyst contains about 3-12% molybdenum and nickel The amount is about 4 to 10%, and a certain amount of vanadium, and the rest is mainly composed of γ-type Al 2 o 3 , In addition, it also contains iron, phosphorus, carbon, sulfur and so on. As my country's economy continues to grow at a high speed, oil consumption continues to increase, and the number of such spent catalysts produced every year reaches tens of thousands of tons, and is still increasing. Waste catalysts contain a large amount of valuable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B34/34C22B23/00
CPCC22B1/02C22B7/008C22B7/009C22B23/00C22B34/345Y02P10/20
Inventor 张邦胜刘贵清王芳姚现召张帆姜东朱坤娥龚卫星曲志平
Owner XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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