Study Of Ion Exchange Production Of Ammonium Molybdate Process

Molybdenum has been widely applied in the metallurgy, chemistry, mechanics and petroleum field as a strategic resource. Ammonium Molybdate is the key semi-finished intermediate product. The traditional smelting process of molybdenum concentrate is now being challenged by the new technology of ion exchange. Because molybdenum and tungsten belong to the same main group, they have the extremely similar properties. The successful practice of tungsten in the field of ion exchange can be used in the molybdenum metallurgy. Molybdenum concentrate is treated by oxidative roasting, desulfuration for comprehensive recovery and hyperbaric alkaline leaching of molybdenum calcine. The technology of producing ammonium molybdate with ion exchange is established by the experiment of rough sodium molybdate solution's ion exchange and evaporation crystallization. The process is new kind of technology and verified by industrial production. Compared with traditional process, this technology has the following characteristics:1. Simple technical processes, reasonable process and easy to realize automation.2. Molybdenite is treated & byoxidative roasting with advanced rotary kiln and perfect dust collecting system. After two-stage leaching, the leaching rate of molybdenum is above 98.5%. The ion-exchange series-column absorption can guarantee the absorption rate of Mo reach 99%. The total recovery rate of Mo can reach 96.85%.3. The waste water of ion exchange, condensate and circulating water of evaporation and the tail gas waste heat of rotary kiln are sufficiently and effectively utilized. The consumption of energy and water and the cost of operation are greatly reduced.4. The closed recycling is used to treat the ammonia in the process of evaporation crystallization. The recovery rate of ammonia reaches 99.5%. The waste pollution is reduced and the production environment is good. The advanced environmental protection is in accordance with the direction of industrial development of clean production advocated by the government.5. After testing, the pHysical and chemical properties of ammonium molybdate accord with national standard. The products have uniform particles. The quality of ammonium molybdate is high enough to meet the requirements for the deep processing of molybdenum bar and filament. With more and more governmental empHasis on environmental and molybdenum resources protection, the technology of ion exchange to molybdenum smelting will gradually replace the traditional production process and be recognized, used and developed by molybdenum smelting industry.