Study on Preparation Technology of Low Nitrogen Niobium Hydroxide
The tantalum niobium ore was decomposed by hydrofluoric acid and sulfuric acid and then separated by extraction to obtain niobium solution,the white niobium hydroxide precipitates were formed by neutralizing the niobium solution with 0.3MPa ammonia gas,after filtering by filter press,washing with dilute ammonia water and removing 40％～50％of the moisture with 0.6～0.7MPa compressed air,niobium hydroxide wet filter cake containing less than 5000ppm of fluoride ion was obtained.However,after the drying of niobium hydroxide at this time,the content of N is between 3.5％and 4.5％,which cannot meet the customer's requirement that the content of N is less than 0.2％when niobium hydroxide is dried to contain Nb2O5 in 72％～78％.Therefore,the process of niobium hydroxide reducing N was tested.After comprehensive comparison,the appropriate volume fraction of chemical pure hydrochloric acid was selected as the key reagent,Microwave drying equipment was used to dry niobium hydroxide with low nitrogen,and the process parameters for mass production of low nitrogen niobium hydroxide were obtained.
low nitrogen niobium hydroxidechemical pure hydrochloric acidmicrowave drying
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