Method for recovering nickel and molybdenum from waste nickel-molybdenum catalyst

A waste catalyst and catalyst technology, applied in the recovery of rare metals, recovery of nickel and molybdenum from waste nickel-molybdenum catalysts, can solve the problems of large amount of sodium carbonate, high energy consumption, strong corrosiveness of roasting equipment, etc. The effect of large, simple operation and easy continuous production

Inactive Publication Date: 2018-08-31
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 disadvantages of this method are that the amount of sodium carbonate is large, the corrosion to roasting equipment is strong, the energy consumption is high, and the comprehensive recovery rate of molybdenum and nickel is only about 85%.

Method used

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  • Method for recovering nickel and molybdenum from waste nickel-molybdenum catalyst
  • Method for recovering nickel and molybdenum from waste nickel-molybdenum catalyst
  • Method for recovering nickel and molybdenum from waste nickel-molybdenum catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] according tofigure 1 Shown process flow chart reclaims above-mentioned spent nickel-molybdenum catalyst, carries out according to the following steps:

[0049] (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 650°C, the heating rate is 15-20°C / min, and the roasting time is 2h. At the same time, the valuable metal sulfide in the spent catalyst is converted into a valuable metal oxide; the flue gas is introduced into the spray alkali scrubber through the fan to remove SO 2 smoke.

[0050] Table 3 The results of the first-stage roasting test of waste nickel-molybdenum catalyst

[0051]

[0052] (2) After mixing the first-stage roasted material obtained in step (1) with sodium carbonate uniformly according to the molar ratio of 1:1.1, carry out the second-stage alkali roasting at high temperature, the roasting temperature is 1000°C, and the hea...

Embodiment 2

[0074] according to figure 1 The shown process flow chart reclaims the above-mentioned waste nickel-molybdenum catalyst, and the specific steps are the same as in Example 1, and the different reaction conditions are: a calcination temperature of 600° C., a calcination time of 2 h in the first stage; a calcination temperature of 950° C. in the second stage, and The roasting time is 70min, the ratio of alkali to material is 1.2:1; the temperature in the water leaching stage is 85°C, the time is 1.5h, and the liquid-solid ratio is 6:1; , the liquid-solid ratio is 7:1, and the time is 110 minutes; the molar ratio of barium hydroxide and molybdenum in the molybdenum precipitation stage is 2.5:1, the temperature is 80°C, and the time is 45min; the concentration of sodium bicarbonate in the neutralization and precipitation aluminum stage is 35g / L, and the temperature is 35°C , shaking time 8min.

Embodiment 3

[0076] according to figure 1 The shown process flow chart reclaims the above-mentioned waste nickel-molybdenum catalyst, and the specific steps are the same as in Example 1, and the different reaction conditions are: a calcination temperature of 580° C., a calcination time of 3 h in the first stage; a calcination temperature of 950° C. in the second stage, and The roasting time is 80 minutes, the ratio of alkali to material is 1.2:1; the temperature in the water leaching stage is 95°C, the time is 1h, and the liquid-solid ratio is 7:1; The liquid-solid ratio is 8:1, and the time is 120 minutes; the molar ratio between the precipitation molybdenum stage and molybdenum is 3:1, the temperature is 80°C, and the time is 50 minutes; the concentration of sodium bicarbonate in the neutralization and precipitation aluminum stage is 40g / L, the temperature is 35°C, and the shaking time is 10 minutes .

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Abstract

The invention discloses a method for recovering nickel and molybdenum from a waste nickel-molybdenum catalyst. The method comprises the concrete steps of firstly carrying out primary low-temperature roasting, then carrying out secondary high-temperature alkali roasting, and transforming molybdenum and aluminum components in the waste catalyst into water-soluble sodium molybdate and sodium metaaluminate; then carrying out water leaching and solid-liquid separation to obtain a nickel slag and an alkaline filter liquor containing molybdenum and aluminum; carrying out acid leaching, evaporative crystallization and solid-liquid separation on the nickel slag to obtain a nickel sulfate product; and adding a barium salt precipitant into the filter liquor to separate the aluminum and the molybdenum, obtaining a refined aluminum-containing solution, adopting a chemical precipitation method to obtain an aluminum hydroxide precipitate, and calcining to obtain an aluminum oxide product. According to the method for recovering the nickel and the molybdenum from the waste nickel-molybdenum catalyst provided by the invention, valuable metals in the catalyst is comprehensively recycled, three products such as nickel sulfate, barium molybdate and aluminum oxide are obtained, the valuable metal recovery rate is high, the product added value is high, and the method has a certain application value.

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 recovering nickel and 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 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B23/00C22B21/00C22B34/34
CPCC22B1/02C22B7/001C22B7/007C22B21/003C22B23/0423C22B34/345Y02P10/20
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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