Method for purifying molybdenum concentrate through microwave-acid leaching combined technologies

Abstract

The invention provides a method for purifying molybdenum concentrate through microwave-acid leaching combined technologies. The method comprises the following steps: 1, performing microwave heating treatment on the molybdenum concentrate; 2, immersing the molybdenum concentrate into a hydrochloric acid-hydrofluoric acid composite pickle liquor for acid leaching treatment, and obtaining the molybdenum concentrate with the MoS2 mass content no smaller than 99 percent after filtering, washing and drying. The invention further provides another method for purifying the molybdenum concentrate through the microwave-acid leaching combined technologies, and the method comprises the following steps: 1, performing microwave heating treatment on the molybdenum concentrate; 2, immersing the molybdenum concentrate into hydrochloric acid for first acid leaching treatment, and then carrying out filtering, washing and drying treatments; 3, immersing the molybdenum concentrate into hydrofluoric acid for second acid leaching treatment, and obtaining the molybdenum concentrate with the MoS2 mass content no smaller than 99 percent through filtering, washing and drying. In the method, the microwave processing technology and the acid pickling technology are organically combined together, fast and effective separating for the molybdenum concentrate from impurities can be achieved, the purifying effect is excellent, and beneficial social value and economic value can be achieved.

Description

technical field [0001] The invention belongs to the technical field of molybdenum concentrate purification, and in particular relates to a method for purifying molybdenum concentrate through a microwave-acid leaching composite process. Background technique [0002] Molybdenum concentrate is an important raw material for the production of high-purity molybdenum disulfide, molybdenum trioxide, molybdenum dioxide, molybdenum powder and other molybdenum products. important role. Therefore, in industrial production, the quality and purity of molybdenum concentrate should be improved as much as possible, which has very positive significance for simplifying the deep processing process and improving the quality of molybdenum products. [0003] In the current industrial production, MoS in the molybdenum concentrate after mineral processing 2 The mass content of molybdenum disulfide is usually 85% to 95%, while the mass purity of molybdenum disulfide products used for deep processin...

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Problems solved by technology

However, the higher the heating temperature, the easier it is to oxidize molybdenum sulfide, which places extremely high requirements on equipment

Moreover, vacuum heat treatment is difficult to carry out continuous operation, and the production cost is relatively high

[0007] Although microwave extraction technology has been continuously applied in traditional Chinese medicine, diatomite, ilmenite and other fields, it is mainly limited to the liquid phase environment and uses the microwave thermal effect.

The traditional microwave extraction is not suitable for purifying molybdenum concentrate. The main reasons are: First, the mineral structure and impurity components of molybdenum concentrate are essentially different from those of diatomite and ilmenite, so there must be significant differences in their microwave treatment processes. ; Second, the traditional microwave extraction process is mostly used in a strong oxidative environment, which will make MoS 2 Severe oxidation occurs; third, the traditional microwave extraction process is mostly carried out in a high-temperature atmospheric environment, which will cause MoS in molybdenum concentrate 2 Rapid oxidation to molybdenum oxide

[0008] The survey shows that the technology of using low-temperature microwave treatment-acid leaching composite process to realize the effective separation of molybdenum concentrate and impurities and carry out industrial production has not yet been systematically studied and applied.

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