کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8012184 | 1516939 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction mechanisms of low-grade molybdenum concentrate during calcification roasting process
ترجمه فارسی عنوان
مکانیسم واکنش کنسانتره مولیبدن پایین کم در طی فرایند کوره سازی کلسیفیکاسیون
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کلمات کلیدی
کنسانتره مولیبدن، کباب کردن کباب کردن، مکانیسم واکنش، تجزیه و تحلیل ترمودینامیکی، تبدیل فاز،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
چکیده انگلیسی
The effects of Ca-based additives on roasting properties of low-grade molybdenum concentrate were studied. The results show that calcium-based additives can react with molybdenum concentrate to form CaSO4 and CaMoO4. The initial oxidation temperature of MoS2 is 450 °C, while the formation of CaMoO4 and CaSO4 occurs above 500 °C. The whole calcification reactions are nearly completed between 600 and 650 °C. However, raising the temperature further helps for the formation of CaMoO4 but is disadvantageous to sulfur fixing rate and molybdenum retention rate. Calcification efficiency of Ca-based additives follows the order: Ca(OH)2>CaO>CaCO3. With increasing the dosage of Ca(OH)2, the molybdenum retention rate and sulfur-fixing rate rise, but excessive dosages would consume more acid during leaching process. The appropriate mass ratio of Ca(OH)2 to molybdenum concentrate is 1:1. When roasted at 650 °C for 90 min, the molybdenum retention rate and the sulfur-fixing rate of low-grade molybdenum concentrate reach 100% and 92.92%, respectively, and the dissolution rate of molybdenum achieves 99.12% with calcines being leached by sulphuric acid.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 26, Issue 11, November 2016, Pages 3015-3023
Journal: Transactions of Nonferrous Metals Society of China - Volume 26, Issue 11, November 2016, Pages 3015-3023
نویسندگان
Min GAN, Xiao-hui FAN, Xu-ling CHEN, Cheng-qian WU, Zhi-yun JI, Song-rong WANG, Guo-jing WANG, Guan-zhou QIU, Tao JIANG,