CN-116732355-B - Method for extracting molybdenum by mechanical activation of refractory molybdenum ore

Abstract

The invention relates to the technical field of nonferrous metallurgy, in particular to a method for extracting molybdenum by mechanical activation of refractory molybdenum ores. The method comprises the following steps of S1, mechanically crushing the sulfur-containing molybdenum ore to be less than 2mm, S2, adding an activating agent and water into crushed molybdenum ore particles with the granularity of less than 2mm according to a proportion, performing ball milling activation to obtain activated minerals, S3, adding the activated minerals into leaching liquid according to a solid-liquid ratio, controlling the leaching temperature to be 20-100 ℃ and the leaching time to be 1-12 hours, and S4, performing solid-liquid separation and recycling molybdenum in the leaching liquid after leaching is completed. The method can be used for efficiently leaching the molybdenum in the sulfur molybdenum ore into the solution, has simple and environment-friendly process, and realizes the efficient utilization of the difficult-to-treat sulfur molybdenum ore and associated minerals thereof.

Inventors

• WANG YONGLIANG
• WANG CONGYING
• LIU HUI
• MENG YUNSHENG
• CHEN SHUSEN
• LIU ZHICHAO

Assignees

• 核工业北京化工冶金研究院

Dates

Publication Date

20260512

Application Date

20220302

Claims (8)

1. 1. The method for extracting molybdenum by mechanical activation of refractory molybdenum ore is characterized by comprising the following steps: S1, mechanically crushing the sulfur molybdenum ore to be less than 2 mm; Step S2, adding an activating agent and water into crushed molybdenum ore particles with the granularity of less than 2mm according to a proportion, and performing ball milling activation to obtain activated minerals, wherein the activating agent is one or more of sodium hypochlorite, calcium hypochlorite, sodium chlorate, hydrogen peroxide, sodium carbonate, hydrogen sodium bicarbonate, sodium oxide, calcium hydroxide and potassium hydroxide, and the adding amount of the activating agent is not more than 10% of the mass of the molybdenum ore; step S3, adding leaching liquid into the activated minerals according to a liquid-solid ratio, wherein the leaching temperature is controlled to be 20-100 ℃ and the leaching time is 1-12 hours; And S4, after leaching, carrying out solid-liquid separation to recover molybdenum in the leaching solution.
2. 2. The method for mechanically activating and extracting molybdenum from refractory molybdenum ore according to claim 1, wherein the water is added in an amount of not more than 10% by mass of the molybdenum ore in the step S2.
3. 3. The method for mechanically activating and extracting molybdenum from refractory molybdenum ore according to claim 1, wherein in the step S3, the liquid-solid ratio is 0.1-5.
4. 4. The method for mechanically activating and extracting molybdenum from refractory molybdenum ore according to claim 1, wherein in said step S3, the mass concentration of said leachate is not more than 20%.
5. 5. The method for mechanically activating and extracting molybdenum from refractory molybdenum ore according to claim 1, wherein in the step S3, the leaching solution is sulfuric acid solution, hydrochloric acid solution, nitric acid solution, acetic acid solution, sodium hydroxide solution, ammonia water or potassium hydroxide solution.
6. 6. The method for extracting molybdenum by mechanical activation of refractory molybdenum ores according to claim 1, wherein the step S1 is specifically: mechanically crushing the thiomolybdate ore, then grading the granularity, and reusing the granularity of the particles larger than 2mm for mechanical crushing; particles with a particle size of 2mm or less are used in the subsequent step S2.
7. 7. The method for extracting molybdenum by mechanical activation of refractory molybdenum ores according to claim 1, wherein the leaching temperature is 25-80 ℃.
8. 8. The method for extracting molybdenum by mechanical activation of refractory molybdenum ores according to claim 1, wherein the leaching time is 3-8 hours.

Description

Method for extracting molybdenum by mechanical activation of refractory molybdenum ore Technical Field The invention relates to the technical field of nonferrous metallurgy, in particular to a method for extracting molybdenum by mechanical activation of refractory molybdenum ores. Background Molybdenum metal does not normally occur naturally in monomeric form but is associated with other elements. Although molybdenum-containing minerals have been found to be more than 20, the only most commercially valuable is molybdenite. The rubber sulfur molybdenum ore is a colloidal amorphous molybdenum-containing sulfide, can be converted into hexagonal molybdenite by heating, and is one of the most difficult minerals to treat in molybdenum ore resources. Although the composition of the glued sulfur molybdenum ore and the molybdenite ore is the same, the temperature of the glued sulfur molybdenum ore is lower than that of the molybdenite ore, so that the glued sulfur molybdenum ore is not completely crystallized in the ore forming process, and the properties of the glued sulfur molybdenum ore and the molybdenite ore are greatly different. The gum sulfur molybdenum ore is amorphous mineral, is mostly produced in a colloidal aggregate, has fine embedding granularity, difficult monomer dissociation, easy mud formation and poor floatability, and is difficult to effectively recycle molybdenum in the mineral by adopting the traditional physical mineral separation and metallurgical technology. At present, various treatment methods for the glued sulfur molybdenum ores comprise a series of molybdenum recovery process technologies such as oxidative roasting-acid leaching, strong magnetic separation-acid leaching, mixed acid high-temperature curing, heap leaching and pressure leaching. The conventional acid leaching or alkaline leaching generally uses acid or alkali as a leaching agent, and simultaneously adds oxidizing agents such as hydrogen peroxide, potassium permanganate and the like, and the leaching rate is low, generally only about 50%. In order to reduce the leaching cost, treatment by a method such as acid-mixed high-temperature curing and heap leaching is studied, but the leaching rate is not ideal. Although the oxidation roasting can improve the leaching efficiency, the concentration of SO 2 generated in the roasting process is low, the acid is difficult to prepare, and meanwhile, the smoke dust volatilizes, SO that the environment pollution is caused. The high-temperature pressure leaching is a green leaching technology, can obviously improve the leaching efficiency of molybdenum, but has complex process, higher requirements on production equipment, higher production cost and equipment investment cost, and restricts the use of the technology. In general, the method has the limitations of low molybdenum recovery rate, high production cost, easy environmental pollution and the like, and is difficult to popularize and apply in industrial production. With the development of society, the demand of human beings for molybdenum resources is increasing, and the demand of the existing easy-to-process molybdenum resources is difficult to meet. Therefore, research on refractory molybdenum ore resources is developed, an economic, efficient and environment-friendly process is developed, and the method has important significance for utilizing the sulfur-containing molybdenum ore resources. Disclosure of Invention The invention aims to solve the technical problems of providing the method for extracting molybdenum by mechanical activation of the refractory molybdenum ore, which can be used for efficiently leaching the molybdenum in the sulfur-containing molybdenum ore into the solution, has simple and environment-friendly process and realizes the efficient utilization of the refractory sulfur-containing molybdenum ore and associated minerals thereof. The invention provides a method for extracting molybdenum by mechanical activation of refractory molybdenum ores, which comprises the following steps: S1, mechanically crushing the sulfur molybdenum ore to be less than 2 mm; S2, adding an activating agent and water into the crushed molybdenum ore particles with the granularity of less than 2mm according to the proportion, and performing ball milling activation to obtain activated minerals; step S3, adding leaching liquid into the activated minerals according to a liquid-solid ratio, wherein the leaching temperature is controlled to be 20-100 ℃ and the leaching time is 1-12 hours; And S4, after leaching, carrying out solid-liquid separation to recover molybdenum in the leaching solution. Preferably, in the step S2, the activator is one or more of sodium hypochlorite, calcium hypochlorite, sodium chlorate, hydrogen peroxide, manganese dioxide, potassium permanganate, sodium carbonate, sodium bicarbonate, sodium oxide, calcium hydroxide and potassium hydroxide. Preferably, in the step S2, the activator is added in an amount of not more than