Manufacturing method of ammonium molybdate
I. Introduction
Ammonium molybdate is an important raw material for the production of chemicals, which is widely used in metallurgy, petroleum, chemical industry, agriculture and other fields. Mastering the manufacturing method of ammonium molybdate is of great significance for improving product quality, reducing cost and promoting industrial development. In this paper, the manufacturing method of ammonium molybdate will be introduced in detail, including raw material preparation, reaction process, post-treatment and other links.
Second, raw material preparation
The main raw materials for manufacturing ammonium molybdate include molybdenum concentrate, ammonia, sulfuric acid and so on. In order to ensure product quality, it is necessary to select raw materials of good quality and carry out strict inspection. Among them, the molybdenum content in molybdenum concentrate should be not less than 45%, the concentration of ammonia should be between 25% and 28%, and the concentration of sulfuric acid should be 93% to 98%.
III. Reaction process
1. Leaching
Mix molybdenum concentrate with sulfuric acid in a certain proportion, heat it to a certain temperature, and carry out leaching reaction. Appropriate stirring speed and time should be maintained during the leaching process to ensure that the molybdenum concentrate is fully reacted. After the reaction, the molybdic acid leaching solution is filtered. Neutralization
Mix the molybdic acid leaching solution with ammonia in a certain proportion, adjust the pH value to a suitable range, so that ammonium molybdate precipitation precipitation. In the process of neutralization, it is necessary to control the speed and amount of ammonia added to maintain the stability of ammonium molybdate in solution.
3. Crystallization
The neutralized solution is subjected to a crystallization operation to obtain ammonium molybdate crystals. During the crystallization process, the crystallization temperature and stirring speed should be controlled to obtain crystals with uniform particle size and high purity. IV. Post-treatment
1. Centrifugal separation
The solution after crystallization is centrifuged to obtain ammonium molybdate crystals and mother liquor. The centrifugation speed and time should be controlled during the centrifugation process to ensure the effective separation of the crystals and mother liquor. Washing
2. Washing
Ammonium molybdate crystals were washed with deionized water to remove impurity ions adhering to the surface. The washing solution needs to be changed several times during the washing process to ensure the purity of the crystals. Drying
3. Drying
The washed ammonium molybdate crystals are dried to obtain the final ammonium molybdate product. The drying temperature and time should be controlled during the drying process to avoid crystal caking and deterioration.
V. Precautions
1. During the whole manufacturing process, the temperature and pH value of each link should be strictly controlled to ensure the quality and purity of the product.
2. The proportion of raw materials should be adjusted according to the actual situation to ensure the smooth progress of the reaction and the quality of the product.
3. During the operation, safety should be observed to avoid contacting toxic and harmful substances.
VI.CONCLUSION
Mastering the manufacturing method of ammonium molybdate is of great significance for improving product quality, reducing cost and promoting industrial development. Through strict raw material preparation, scientific reaction process and post-treatment operation, high purity ammonium molybdate products can be manufactured to meet the needs of different fields. In the actual production process, the manufacturing method should be optimized and improved according to the specific situation in order to improve the production efficiency and product quality.
