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Study on a New Process for the Wet Preparation of Ammonium Heptamolybdate from Ammonium Dimolybdate AITranslate

CHEN Chao; ZHANG Gui-qing; GUAN Wen-juan; WU Xin-sheng; WU Sheng-xi; LI Qing-gang; CAO Zuo-ying
Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University;Metallurgical Separation Science and Engineering Laboratory,School of Metallurgy and Environment,Central South University
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Abstract AITranslate

Ammonium heptamolybdate was prepared by water dissolving-evaporation concentration removal of ammonia-cooling crystallization method using ammonium dimolybdate as raw material.The effects of concentration degree on crystallization product were investigated,and the effects of concentrated liquid density,cooling rate,crystal growing time,and stirring rate on the particle size and morphology of ammonium heptamolybdate were also studied.The results show that ammonium heptamolybdate crystals with a single phase can be prepared by the evaporation concentration-cooling crystallization method after the water dissolution of ammonium dimolybdate.With a concentrated liquid density of about 1.38 g/cm3,a cooling rate of 30℃/h,a crystal growing time of 1 h,a stirring rate of 150 r/min,and a final cooling temperature of 22℃,the crystals of ammonium heptamolybdate are complete in morphology and prismatic with an average particle size of 337.649μm in a controlled cooling crystallization process.

KeyWords AITranslate

ammonium heptamolybdate ammonium dimolybdate evaporation concentration cooling crystallization morphology particle size

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Basic Information:

DOI：

Chinese Library Classification Number:TF841.2[冶金工程—有色金属冶金]

Citation Information:

Ammonium heptamolybdate was prepared by water dissolving-evaporation concentration removal of ammonia-cooling crystallization method using ammonium dimolybdate as raw material.The effects of concentration degree on crystallization product were investigated,and the effects of concentrated liquid density,cooling rate,crystal growing time,and stirring rate on the particle size and morphology of ammonium heptamolybdate were also studied.The results show that ammonium heptamolybdate crystals with a single phase can be prepared by the evaporation concentration-cooling crystallization method after the water dissolution of ammonium dimolybdate.With a concentrated liquid density of about 1.38 g/cm3,a cooling rate of 30℃/h,a crystal growing time of 1 h,a stirring rate of 150 r/min,and a final cooling temperature of 22℃,the crystals of ammonium heptamolybdate are complete in morphology and prismatic with an average particle size of 337.649μm in a controlled cooling crystallization process.

quote

GB/T 7714-2015 [1] CHEN Chao, ZHANG Gui-qing, GUAN Wen-juan, et al. Study on a New Process for the Wet Preparation of Ammonium Heptamolybdate from Ammonium Dimolybdate[J]. Rare Metals and Cemented Carbides, 2023(2): 13-19.
MLA [1] CHEN Chao, et al., "Study on a New Process for the Wet Preparation of Ammonium Heptamolybdate from Ammonium Dimolybdate." Rare Metals and Cemented Carbides, no. 2, 2023, pp. 13-19.
APA [1] CHEN Chao, ZHANG Gui-qing, GUAN Wen-juan, WU Xin-sheng, WU Sheng-xi, LI Qing-gang, & CAO Zuo-ying. (2023). Study on a New Process for the Wet Preparation of Ammonium Heptamolybdate from Ammonium Dimolybdate. Rare Metals and Cemented Carbides(2), 13-19.
IEEE [1] CHEN Chao, ZHANG Gui-qing, GUAN Wen-juan, WU Xin-sheng, WU Sheng-xi, LI Qing-gang, and CAO Zuo-ying, "Study on a New Process for the Wet Preparation of Ammonium Heptamolybdate from Ammonium Dimolybdate," Rare Metals and Cemented Carbides, no. 2, pp. 13-19, 2023. keywords: {ammonium heptamolybdate;ammonium dimolybdate;evaporation concentration;cooling crystallization;morphology;particle size}