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Method for preparing molybdenum trioxide

A technology of molybdenum trioxide and sodium molybdate, applied in the direction of molybdenum oxide/molybdenum hydroxide, etc., can solve the problems of precipitating molybdenum element, difficult to generate solid precipitation, etc., and achieve the effects of improving decomposition rate, short production process and simple equipment.

Inactive Publication Date: 2012-07-11
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing acid process, generally used strong acid additives such as sulfuric acid and hydrochloric acid can easily make the solution acidic quickly, and in this environment, molybdenum oxide is very easy to form inorganic acid salts that are soluble in water, and it is difficult to Generate solid precipitation, therefore, so far there is no method for directly precipitating molybdenum from sodium molybdate solution in domestic patented technology

Method used

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  • Method for preparing molybdenum trioxide

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Embodiment 1

[0024] Embodiment 1: preparation mass fraction is the sodium molybdate solution of 25%, is added in the solution with tartaric acid as additive, the dosage of additive is 1.2 times of sodium molybdate in stoichiometric molar ratio, and the mixed solution pH control is 7.3. Add the mixed solution into the autoclave and react at 110°C for 11 hours, and the decomposition rate of the sodium molybdate solution is 87%. The obtained slurry was separated by filtration, and the filter cake was washed with deionized water, then put into a roasting furnace, and roasted at a low temperature of 200°C for 4 hours to obtain the finished molybdenum trioxide with a purity of 99.8%. The mother liquor after slurry separation is evaporated and concentrated together with the washing liquid, and the crystallized mother liquor obtained is returned to the sodium molybdate solution preparation step.

Embodiment 2

[0025] Embodiment 2: preparation mass fraction is the sodium molybdate solution of 30%, is added in the solution with malic acid as additive, the dosage of additive is 1.4 times of sodium molybdate according to the stoichiometric molar ratio, and the pH control of mixed solution is 7.6. Add the mixed solution into the autoclave and react at 100°C for 12 hours, and the decomposition rate of the sodium molybdate solution is 91%. The obtained slurry was separated by filtration, and the filter cake was washed with deionized water, then put into a roasting furnace, and roasted at a low temperature of 300°C for 3 hours to obtain finished molybdenum trioxide with a purity of 99.9%. The mother liquor after slurry separation is evaporated and concentrated together with the washing liquid, and the crystallized mother liquor obtained is returned to the sodium molybdate solution preparation step.

Embodiment 3

[0026] Embodiment 3: preparation mass fraction is the sodium molybdate solution of 38%, is that additive is added in the solution with fumaric acid, the dosage of additive is 1.5 times of sodium molybdate by chemical equation metering molar ratio, mixed solution pH control is 7.8. Add the mixed solution into the autoclave and react at 140°C for 10 hours, and the decomposition rate of the sodium molybdate solution is 94%. The obtained slurry was separated by filtration, and the filter cake was washed with deionized water, then put into a roasting furnace, and roasted at a low temperature of 300°C for 3 hours to obtain finished molybdenum trioxide with a purity of 99.5%. The mother liquor after slurry separation is evaporated and concentrated together with the washing liquid, and the crystallized mother liquor obtained is returned to the sodium molybdate solution preparation step.

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Abstract

The invention relates to a method for preparing molybdenum trioxide. The method comprises the following steps of: preparing a 15-60 percent sodium molybdate aqueous solution into which an organic matter additive is added; undergoing a high-pressure hydrothermal reaction; filtering and separating; evaporating and crystalizing a mother liquor; baking at a low temperature; circularly utilizing a mother liquor, and the like. A circular decomposing method is adopted, so that the decomposing rate of a sodium molybdate solution is increased effectively, and the purity of a prepared molybdenum trioxide product is higher than 99.5 percent; and compared with the conventional production technology, the method has the advantages of short production process flow, mild condition, simple equipment, low energy consumption and low pollution.

Description

technical field [0001] The invention relates to a method for preparing molybdenum trioxide, in particular to a method for obtaining molybdenum trioxide with a purity higher than 99.5% by hydrothermally treating a sodium molybdate solution. Background technique [0002] Molybdenum trioxide is used as the main raw material for producing ferromolybdenum and molybdenum compounds, and can also be directly added to molybdenum alloys as an additive for molybdenum elements to improve the properties of the alloys. At present, the main process routes for producing molybdenum trioxide include acid process route and alkali process route, both of which have the problem of long process flow. For example, the alkaline method needs to go through steps such as ammonia leaching-acidification-roasting. As a known technology, this method has the main disadvantages of long process, more equipment required, high cost of various additives, and certain pollution. [0003] It is a short-process sme...

Claims

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Application Information

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IPC IPC(8): C01G39/02
Inventor 李建圃
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
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