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Comparative Study of Crystallization Process and Ammonium Molybdate Quality
Release time:
2024-11-25
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Crystallization is a process of mutual transformation between substances, often accompanied by phase changes. It is a complex chemical reaction process, such as the precipitation of solute crystals in the liquid phase due to changes in external conditions, and the chemical reactions of various components in the gas phase generating crystals. Crystallization is an ancient and traditional topic in the field of chemical research.
Crystallization is a behavior of mutual transformation between substances; it is a process that often accompanies phase changes. It is a complex chemical reaction process, such as the precipitation of solute crystals in the liquid phase due to changes in external conditions and the chemical reactions of components in the gas phase generating crystals. Crystallization is an ancient and traditional topic in the field of chemical research.
The preparation of ammonium molybdate is an important part of the molybdenum metallurgy process, which is a complex chemical reaction process of converting liquid phase solute to solid phase. In the molybdenum metallurgy industry, this process has two purposes: first, to synthesize a crystalline substance; second, crystallization can allow certain soluble impurities to remain in the liquid phase, thereby achieving the separation of molybdenum from impurities. Currently, based on the crystallization conditions of ammonium molybdate, four varieties can be prepared: diammonium molybdate, tetraammonium molybdate, heptaammonium molybdate, and dodecaammonium molybdate, namely the processes for diammonium molybdate, tetraammonium molybdate, heptaammonium molybdate, and dodecaammonium molybdate.
Diammonium molybdate is obtained by evaporating an ammonium molybdate solution, causing ammonia and water to evaporate, leading to the precipitation of ammonium molybdate in a supersaturated state; tetraammonium molybdate is obtained by adding inorganic acid to the ammonium molybdate solution, promoting the solution to reach a supersaturated state for precipitation; heptaammonium molybdate is obtained by evaporating the ammonium molybdate solution to a certain specific gravity and pH, then cooling the solution to achieve supersaturation for precipitation; dodecaammonium molybdate is obtained by adding oligomeric ammonium molybdate to an acidic solution at a certain temperature and molar concentration, first dissolving the ammonium molybdate, then lowering the temperature to induce crystallization.
As mentioned above, the crystallization methods of ammonium molybdate differ, leading to different crystallization behaviors. Consequently, the impurity removal capabilities of their crystallization processes should vary accordingly. Therefore, a comparative study of the crystallization processes was conducted through experimental methods to investigate the impurity removal capabilities of the crystallization processes and to explore the crystal morphology of ammonium molybdate.
Crystallization,Chemistry
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