Method for preparing high-purity molybdenum trioxide from molybdenum concentrate through hydrometallurgy

A technology of molybdenum trioxide and hydrometallurgy, which is applied in the field of molybdenum industry and hydrometallurgy, can solve the problems of lack of international competitiveness, low purity, environmental pollution, etc., achieve no environmental pollution, high comprehensive recovery rate, and avoid pollution Effect

Active Publication Date: 2018-01-16
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

These two methods all use ammonia water as alkaline immersion agent, and the obtained product ammonium molybdate will produce ammonia gas in the process of being converted into molybdenum trioxide, which will inevitably cause certain environmental pollution.
In addition, the purity of industrial grade molybdenum trioxide is relatively low (molybdenum content is 57-60%), which lacks international competitiveness

Method used

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  • Method for preparing high-purity molybdenum trioxide from molybdenum concentrate through hydrometallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The mass percentage of molybdenum in the molybdenum concentrate processed in this embodiment is 15%, and the particle size of the molybdenum concentrate is -150 mesh-+200 mesh. method, the method includes the following steps:

[0051] (1) Mix molybdenum concentrate and deionized water uniformly at a solid-to-liquid ratio of 1:2 (g:mL) to make molybdenum concentrate slurry;

[0052] (2) Pour the molybdenum concentrate slurry prepared in step (1) into a high-pressure reaction kettle, and carry out high-pressure oxidation decomposition reaction at 180 °C and an oxygen partial pressure of 3.0 MPa. The reaction time is 2 hours, and the high-pressure oxidation decomposition reaction is obtained. Molybdenum concentrate slurry;

[0053] (3) Using a centrifuge to filter the molybdenum concentrate slurry after the high-pressure oxidation decomposition reaction in step (2) to obtain a primary filter cake and a primary filtrate;

[0054] (4) Use 0.5 mol / L sodium carbonate solutio...

Embodiment 2

[0062] The mass percentage of molybdenum in the molybdenum concentrate processed in this embodiment is 30%, and the particle size of the molybdenum concentrate is -150 mesh-+200 mesh. method, the method includes the following steps:

[0063] (1) Mix molybdenum concentrate and deionized water uniformly at a solid-to-liquid ratio of 1:5 (g:mL) to make molybdenum concentrate slurry;

[0064] (2) Pour the molybdenum concentrate slurry prepared in step (1) into a high-pressure reaction kettle, and carry out high-pressure oxidation decomposition reaction at 200 ° C and an oxygen partial pressure of 3.0 MPa. The reaction time is 2 h, and the high-pressure oxidation decomposition reaction is obtained. Molybdenum concentrate slurry;

[0065] (3) Using a centrifuge to filter the molybdenum concentrate slurry after the high-pressure oxidation decomposition reaction in step (2) to obtain a primary filter cake and a primary filtrate;

[0066] (4) The primary filter cake obtained in step ...

Embodiment 3

[0074] The mass percentage of molybdenum in the molybdenum concentrate processed in this embodiment is 45%, and the particle size of the molybdenum concentrate is -150 mesh-+200 mesh. method, the method includes the following steps:

[0075] (1) Mix molybdenum concentrate and deionized water uniformly at a solid-to-liquid ratio of 1:7 (g:mL) to make molybdenum concentrate slurry;

[0076] (2) Pour the molybdenum concentrate slurry prepared in step (1) into the high-pressure reaction kettle, and carry out high-pressure oxidation decomposition reaction at 220°C and oxygen partial pressure of 3.5MPa. The reaction time is 3 hours, and the high-pressure oxidation decomposition reaction is obtained. Molybdenum concentrate slurry;

[0077] (3) Using a centrifuge to filter the molybdenum concentrate slurry after the high-pressure oxidation decomposition reaction in step (2) to obtain a primary filter cake and a primary filtrate;

[0078] (4) Use 0.5 mol / L sodium carbonate solution t...

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Abstract

The invention provides a method for preparing high-purity molybdenum trioxide from molybdenum concentrate through hydrometallurgy. The method comprises steps as follows: the molybdenum concentrate anddeionized water are mixed uniformly, and molybdenum concentrate pulp is prepared; the molybdenum concentrate pulp is subjected to a high-pressure oxygenolysis reaction, the reacted pulp is filtered;an obtained filter cake is subjected to alkaline leaching, filtered and washed, and a molybdate solution and waste residues are obtained; obtained filtrate and the molybdate solution are mixed, alkaliis added to adjust the pH, and the mixture is precipitated for impurity removal; the pH of a solution obtained after filtration of precipitates is adjusted to be neutral, a precipitation aid is addedand mixed sufficiently, and sulfuric acid is continuously added for pH adjustment, and acid settlement is performed; a material subjected to acid settlement is filtered again, a filter cake is calcined, and the high-purity molybdenum trioxide is obtained. The molybdenum content of the high-purity molybdenum trioxide obtained with the method can reach 66% or above, the total recovery rate of molybdenum can reach 98% or above, and meanwhile, raw gypsum products can be produced. The method is a production process which cannot cause environmental pollution, adopts a simple technological process and is used for preparing the high-purity molybdenum trioxide.

Description

technical field [0001] The invention relates to the technical field of molybdenum industry and hydrometallurgy, in particular to a method for preparing high-purity molybdenum trioxide by hydrosmelting molybdenum concentrate. Background technique [0002] After the molybdenite is crushed, ground, roughed and selected, the molybdenum concentrate with high molybdenum content can be obtained, and 98% of the molybdenum concentrate must be converted into molybdenum trioxide. At present, the traditional fire roasting-ammonia leaching process is mainly used to prepare molybdenum trioxide from molybdenum concentrate, but this process has serious SO 2 Pollution, low metal comprehensive recovery rate, not suitable for processing low-grade ore and complex ore, and the quality of products prepared by this process is poor and uneven. [0003] Hydrometallurgy molybdenum concentrate process does not produce SO 2 And smoke, greatly reducing air pollution. At present, the main methods of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02
Inventor 勾明雷牛青山魏学峰彭淑鸽韩新毅韩新付
Owner HENAN UNIV OF SCI & TECH
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