Preparation method of extracted high-purity molybdenum trioxide

Abstract

The invention relates to the field of molybdenum trioxide, and specifically relates to a preparation method of extracted high-purity molybdenum trioxide. The preparation method is characterized by comprising the following steps: treating industrial molybdic acid to remove moisture, oil and various trace impurities with a volatilization point lower than 750 DEG C in materials; metering according to sublimation speed for feeding the materials into a subliming furnace, and controlling the temperature of the subliming furnace to 1100 DEG C-1160 DEG C; selectively adopting clean air coiling or liquid nitrogen cooling according to the requirements of the grain size, and controlling the temperature to 250 DEG C or 50 DEG C; collecting the dust by a primary metal membrane for recycling with a yield of 99%, and collecting the dust by a secondary cloth bag with the yield of 1% to recycle high-purity molybdenum trioxide. The technical scheme is adopted, and the subliming furnace is used as a carbon rod for directly heating up, and therefore, the heating efficiency is high, the temperature is controlled by using a computer, and a temperature fluctuation range is + / -1 DEG C. Residues at the furnace bottom are calculated according to material balance and exhausted regularly, and waste of the residues is used as steel-making ferro-molybdenum after being cooled or used as the material for producing sodium molybdate after being crushed. The preparation method disclosed by the invention is safe and reliable in process, high in recovery rate and high in quality, thereby improving production efficiency and relieving labor intensity of operation personnel.

Description

technical field

[0001] The invention relates to the field of molybdenum trioxide, and relates to a preparation method for extracting high-purity molybdenum trioxide. Background technique

[0002] The method commonly used now is: make fine-quality ammonium molybdate from molybdenum-containing raw materials, and heat and refine ammonium molybdate to produce high-purity molybdenum trioxide. Ammonium molybdate is made from molybdenum concentrate with a molybdenum content of more than 40% through roasting, leaching, impurity removal, concentration, acid precipitation, filtration and other processes. The yield of molybdenum is about 95%. Therefore, the amount of waste gas, waste water and waste residue in the production process is large, and the environmental protection is difficult and expensive. Contents of the invention

[0003] The object of the present invention is to propose a method for preparing high-purity molybdenum trioxide with simple process, short time consumption...