Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 7    July 2017

[PDF Download]    [Flash Online]    

    

Molybdenite-limestone oxidizing roasting followed by calcine leaching with ammonium carbonate solution
Qiu-sheng ZHOU, Wei-tao YUN, Jun-tao XI, Xiao-bin LI, Tian-gui QI, Gui-hua LIU, Zhi-hong PENG

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Oxidizing roasting of molybdenite with lime can significantly reduce SO2 pollution compared with the traditional roasting without lime. However, the calcine is subsequently leached by sulfuric acid, resulting in serious equipment corrosion and abundant non-recyclable CaSO4 slag. In this work, a novel process, in which the molybdenite was roasted with CaCO3 followed by (NH4)2CO3 solution leaching, was proposed to improve the art of lime roasting-sulfuric acid leaching. Oxidizing roasting of molybdenite with CaCO3 was investigated through thermodynamic calculation, thermogravimetric analysis and roasting experiments. The results show that the products of the oxidizing reaction of MoS2 in the presence of CaCO3 and O2 are CaSO4, CaMoO4 and CO2 at 573-1000 K. The MoS2 conversion rate achieves approximately 99% and the sulfur-retained rate attains approximately 95% with a CaCO3-to-MoS2 molar ratio of 3.6 at 500 °C for 1 h by adding 5% mineralizer A (mass fraction). The leaching results show that the leaching rate of Mo reaches 98.2% at 85 °C for 7 h with a (NH4)2CO3 concentration of 600 g/L and a liquid-solid ratio of 10 mL/g. The results presented are potential to develop a novel cleaner technique for ammonium molybdate production.

 

Key words: molybdenite; limestone; ammonium carbonate; oxidizing roasting; leaching

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com