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Method for extracting molybdenum from crude molybdic acid and preparing molybdenum product

A technology of molybdenum acid and products, which is applied in the field of extracting molybdenum and preparing molybdenum products, can solve the problems of high cost, many procedures, and long molybdenum product process, and achieve the effects of increasing product added value, shortening the process flow, and reducing production costs

Active Publication Date: 2018-11-02
CENT SOUTH UNIV
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Problems solved by technology

Therefore, molybdenite smelting is currently facing several problems: First, the entire production process of molybdenum products is long, with many processes, complicated and difficult to control, and high cost
Second, in order to purify molybdenum, it is necessary to use ammonia water or ammonium salt as a transformation reagent, which will inevitably lead to the pollution of ammonia nitrogen wastewater and ammonia-containing waste gas in the subsequent process
At present, more studies are using the difference in properties between peroxytungstic acid and peroxymolybdic acid to separate tungsten and molybdenum or to remove molybdenum from tungsten solution, and do not involve the purification of molybdenum and the preparation of molybdenum products
[0004] In addition, Guo Liejin and others mixed tungstic acid and hydrogen peroxide to prepare a precursor solution with a concentration of only 0.005mol / L, and then sprayed the precursor solution on the ITO glass substrate at 250°C by ultrasonic spray pyrolysis, and first obtained a layer of tungstic acid. Tungsten trioxide film can be obtained after subsequent heat treatment at 550°C. The essence of this process is the method of preparing tungstic acid film by spray pyrolysis, and this method does not involve the preparation of molybdenum oxide film

Method used

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  • Method for extracting molybdenum from crude molybdic acid and preparing molybdenum product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First, the sodium molybdate solution was acid-precipitated to obtain crude molybdic acid with a Mo content of 48%.

[0034] A method for extracting molybdenum from crude molybdic acid and preparing a molybdenum product, comprising the steps of:

[0035] (1) The crude molybdic acid with the Mo content of 48% is added to the hydrogen peroxide solution of 30% for dissolving, the controlled reaction temperature is 35° C., and the reaction time is 0.5 hour. After the reaction is completed, it is filtered to obtain Insoluble slag and peroxymolybdic acid solution;

[0036] (2) directly heating the peroxomolybdic acid that step (1) obtains to 90 DEG C, until peroxomolybdic acid is completely decomposed and desorbed molybdic acid;

[0037] (3) after step (2) gained molybdic acid is washed, again molybdic acid is joined in concentration and is dissolved in the hydrogen peroxide solution of 30%, and control reaction temperature is 35 ℃, and the reaction times is 0.5 hour; Obtaine...

Embodiment 2

[0041] First, molybdenite is decomposed under oxygen pressure to obtain crude molybdic acid with a Mo content of 46.5%.

[0042] A method for extracting molybdenum from crude molybdic acid and preparing a molybdenum product, comprising the steps of:

[0043] (1) adding the crude molybdic acid with a Mo content of 46.5% to a hydrogen peroxide solution with a concentration of 28% for dissolving, controlling the reaction temperature to be 15° C., and the reaction time to be 2.0 hours, after the reaction is completed, obtain an insoluble slag by filtering and peroxomolybdic acid solution;

[0044] (2) pass into SO in the peroxymolybdic acid solution that step (1) obtains 2 And control the pH value of the solution to be 1.5, until the complete decomposition of molybdic acid peroxymolybdic acid;

[0045] (3) after step (2) gained molybdic acid is washed, again molybdic acid is joined in concentration and is dissolved in the hydrogen peroxide solution of 28%, and control reaction tem...

Embodiment 3

[0048] First, the sodium molybdate solution is acid-decomposed to obtain crude molybdic acid with a Mo content of 50%.

[0049] A method for extracting molybdenum from crude molybdic acid and preparing a molybdenum product, comprising the steps of:

[0050] (1) adding the above-mentioned thick molybdic acid with a Mo content of 50% into a hydrogen peroxide solution of 30% for dissolving, controlling the reaction temperature to be 25° C., and the reaction time to be 1.0 hour, after the reaction is completed, the insoluble slag is obtained by filtration and peroxomolybdic acid solution;

[0051] (2) directly heating to 90 ℃ to the peroxomolybdic acid solution that step (1) obtains, until peroxomolybdic acid is completely decomposed and desorbed molybdic acid;

[0052] (3) After the molybdic acid obtained in step (2) is washed, it is mixed with a mass concentration of 30% hydrogen peroxide solution for 1 h at a temperature of 40° C. to obtain a pure peroxomolybdic acid solution;...

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Abstract

The invention relates to a method for extracting molybdenum from crude molybdic acid and preparing a molybdenum product. The method comprises the steps that the crude molybdic acid is dissolved with ahydrogen peroxide solution, and an obtained peroxo-molybdic acid solution is heated or SO2 is led into the obtained peroxo-molybdic acid solution until molybdic acid is completely decomposed from peroxo-molybdic acid; filtering is carried out to obtain the molybdic acid; dissolution is carried out by hydrogen peroxide, and decomposition and purification are carried out; the steps of dissolution,decomposition and purification are repeated several times until pure molybdic acid is prepared; calcinations is carried out to prepare molybdenum trioxide; and or the obtained pure molybdic acid is dissolved with hydrogen peroxide, filtering is carried out to obtain a pure peroxo-molybdic acid solution, and then ultrasonic spray pyrolysis is carried out to prepare molybdenum trioxide powder or toprepare molybdenum powder. According to the method, the separation effect is good, the operation process is simple and easy to control, and the method is easy to be industrialized and popularized.

Description

technical field [0001] The invention relates to the technical field of rare metal metallurgy, in particular to a method for extracting molybdenum from crude molybdic acid and preparing molybdenum products. Background technique [0002] At present, there are two types of technology for extracting molybdenum from molybdenum ore in industry: one is to burn molybdenum oxide calcined sand by fire method, and then purify molybdenum products by wet leaching; the other is to make molybdenum fluoride by oxygen pressure leaching Most of the ore is converted into molybdic acid decomposition slag, and a small part enters the solution. After being transformed into molybdenum acid precipitation, ammonium molybdate solution is obtained by dissolving with ammonia water in industry; there is also a crude sodium molybdate solution obtained by dissolving with sodium hydroxide, and then transformed into ammonium molybdate solution by ion exchange or solvent extraction . The ammonium molybdate...

Claims

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Application Information

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IPC IPC(8): C22B34/34C22B3/20B22F9/30
CPCB22F9/30C22B3/20C22B34/34Y02P10/20
Inventor 陈星宇赵中伟
Owner CENT SOUTH UNIV
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