Wet process of extracting vanadium and/or molybdenum from waste catalyst

A technology of waste catalyst and wet method, which is applied in the field of metallurgy, can solve the problems of difficult solid-liquid separation of slurry, small catalyst processing capacity, and large investment in equipment, and achieves the advantages of extraction and molybdenum extraction, easy solid-liquid separation, and mechanization high effect

Inactive Publication Date: 2003-11-05
CITIC JINZHOU METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are low leaching rate, difficulty in solid-liquid separation of slurry during leaching process, large investment in equipment, molybdenum exists in the form of calcium molybdate in leaching slag without recovery, and the ability to treat catalysts is small, etc.

Method used

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  • Wet process of extracting vanadium and/or molybdenum from waste catalyst
  • Wet process of extracting vanadium and/or molybdenum from waste catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1, a kind of technique of wet extraction vanadium and / or molybdenum from waste catalyst, it carries out according to the following steps:

[0043] 1. The oil-containing waste catalyst with natural particle size is sent to the rotary kiln to remove oil at high temperature, and the air flow is used to flow with the material in the kiln to make full use of the heat energy contained in the catalyst. The temperature is controlled at 600 ° C for 4 hours;

[0044] 2. The catalyst after deoiling is added with an additive composed of soda ash, and the catalyst (according to V 2 o 5 meter) and additives in a weight ratio of 1:1;

[0045] 3. The prepared materials are again oxidized and roasted in a rotary kiln at a temperature of 700°C for 5 hours, and the conversion rate of vanadium and molybdenum is greater than 90%;

[0046] 4. The roasted clinker is sent to the leaching tank, and it is immersed in static countercurrent water at a temperature of 25°C for 5 hours, ...

Embodiment 2

[0058] Embodiment 2, a kind of technique of wet extracting vanadium and / or molybdenum from spent catalyst, it carries out according to the following steps:

[0059] 1. The oil-containing waste catalyst with natural particle size is sent to the rotary kiln to remove oil at high temperature, and the airflow is used to flow with the material in the kiln to make full use of the heat energy contained in the catalyst. The temperature is controlled at 750 ° C for 3 hours;

[0060] 2. The catalyst after deoiling is added with an additive consisting of soda ash and salt (the weight ratio is 1:0.1), and the catalyst (according to V 2 o 5 The weight ratio of the additive) to the additive is 1:2;

[0061] 3. The prepared materials are roasted again by high-temperature sodium oxidation in a rotary kiln at a temperature of 850°C for 3.5 hours, and the conversion rate of vanadium and molybdenum is greater than 90%;

[0062] 4. The roasted clinker is sent to the leaching tank, and is immers...

Embodiment 3

[0074] Embodiment 3, a kind of technique of wet extraction vanadium and / or molybdenum from waste catalyst, it carries out according to the following steps:

[0075] 1. The oil-containing waste catalyst with natural particle size is sent to the rotary kiln to remove oil at high temperature, and the air flow is used to flow with the material in the kiln to make full use of the heat energy contained in the catalyst. Control the temperature to 800°C for 3 hours;

[0076] 2. The catalyst after deoiling is added with an additive consisting of soda ash and salt (the weight ratio is 1:0.2), and the catalyst (according to V 2 o 5 The weight ratio of the additive) to the additive is 1:3;

[0077] 3. The prepared materials are roasted again by high-temperature sodium oxidation in a rotary kiln at a temperature of 950°C for 3 hours. The low-valence vanadium and molybdenum in the catalyst are oxidized to a high-valence state, and react with sodium to form water-soluble sodium vanadate a...

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Abstract

The present invention is wet process of extracting vanadium and/or molybdenum form waste petrochemical catalyst alumina carrier containing V, Mo and other elements. The wet process includes high-temperature deoiling the catalyst in natural granularity, mixing with sodium carbonate, high-temperature oxidation and roasting in a kiln or furnace to obtain water soluble sodium vanadate and sodium molybdate; countercurrent water soaking of the chamotte to obtain solution containing V and Mo in certain concentration, adding calcium salt and magnesium salt to eliminate P and other impurities, addingammonium salt solution into the clear solution to obtain ammonium metavanadate, decomposing and melting ammonium metavanadate to obtain V2O5 product; adding acid to the supernatant and organic phase extraction of Mo, ammonia water reverse extraction to obtain ammonium molybdate, and adding acid to precipitate ammonium tetramolybdate or molybdate product.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to the technology of extracting vanadium and molybdenum from waste catalyst by wet method. Background technique [0002] In the process of petroleum processing, Al2O3 is generally used as a carrier containing molybdenum and nickel to deoil or hydrogenate crude oil. In the process of crude oil processing, the catalyst adsorbs a large amount of impurity elements such as vanadium, phosphorus, and iron, which leads to poisoning and failure. Treating the waste catalyst and recovering vanadium and molybdenum elements can not only reduce environmental pollution, but also obtain certain economic benefits. [0003] After retrieval, it is known that there are two patents in this area, one of which is CN1305537A, "Method for Recovering Molybdenum and Vanadium Metals from Waste Catalysts by Alkali Leach Method". It deoils the catalyst with caustic alkali or toluene or xylene under normal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/04C22B7/00
CPCY02P10/20
Inventor 齐牧刘长河白凤仁崔传海赵华王景军王相宝高洪军孙海英
Owner CITIC JINZHOU METAL
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