低品位钼精矿石灰焙烧一酸浸提取钼.pdf

第25卷第10期
中国有色金属学报
2015年10月
Volume 25 Number 10
The Chinese Journal of Nonferrous Metals
October 2015
文章编号:1004-0609(2015)10-2913-08
低品位钼精矿石灰焙烧一酸浸提取钼
陈许玲',王海波,甘敏12,范晓慧,张麟2,邓琼,王勇2,曾金林1
(1.中南大学资源加工与生物工程学院,长沙410083
2.大治有色金属集团控股有限公司,黄石435100)
摘要:采用XRD和TG-DSC分析研究低品位钼精矿石灰氧化焙烧过程的反应机理,确定石灰法焙烧一酸浸提钼
工艺的优化参数。热重分析表明:石灰法焙烧主要发生Ca(OH》2的分解、MoS2的氧化、MoO2的再氧化及钼酸盐
的生成等反应,焙烧过程主要产生MoO2、MoO3、 Campo4、CaSO4等物相。XRD分析表明:当温度高于600℃
反应时间大于90min时,焙砂中低价态钼的衍射峰完全消失,此时焙砂主要物相为 Camo4和CaSO4,辉钼矿被
充分氧化;石灰焙烧适宜的条件为Ca(OH)2与钼精矿质量比1:1、焙烧温度650℃、焙烧时间90min,焙烧过程
硫的保留率可达91.49%。铝焙砂酸浸适宜的浸出温度为90℃、浸出时间为2h、H2SOっ4浓度为70gL、液固比为
5:1,此时钼浸出率可达99.12%, Camo4被完全溶出。
关键词:低品位钼精矿;石灰焙烧;酸浸;物相变化
中图分类号:TF841.2
文献标志码:
Extraction of molybdenum from low grade molybdenum
concentrates by calcium-based roasting and acid leaching process
CHEN Xu-ling WANG Hai-bo GAN Min, FAN X ao-hui, ZHANG Lin
DENG Qiong, WANNG Yong, ZENG Jin-lin
(1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Daye Non-ferrous Metals Group Holdings Co, Ltd, Huangshi 435100, China
Abstract: The mechanism of chemical reactions was studied on the oxidation of low grade molybdenum concentrate with
addition of calcium oxide by the methods of RD and TG-DSC and the optimum conditions of calcium-based roasting
and acid leaching were determined. The result of TG-DSC shows that the reactions are composed mainly of
decomposition of a(H x zation of Mo re-o ization of Mo and the formation of molybdate. The products
are Moo2, Moo Camo O] and Caso% in the process of oxidation roasting. The XRD result shows that the diffractions of
low valence state molybdenum can not disappear completely until roasting temperature exceeds 600 C and roasting time
is longer than 90 min. The main phases are Camoo& and Caso in molybdenum calcine, and the molybdenite can be
oxidized completely. The retaining ratio of sulfur can reach 91 49% under the condi ions of mass ratio of Ca(OH) 2 to
molybdenum concentrate 1: l, roasting temperature 650 C and roasting time 90min. The test shows that the leaching rate
of molybdenum can reach 99.12% under the suitable conditions of leaching temperature 90 C, leaching time 2 h
sulfuric acid 70 g/L, the ratio of liquid to solid 5: 1
Key words: low grade molybdenum concentrate; calcium-based roasting; acid leaching; phase transformation
钼是一种稀有金属,具有高强度、高熔点、耐研光电材料等领域り。2013年,我国钼产量8.57万t,钼
磨、耐腐蚀等优点,被广泛运用于冶金、航天航空、消费量8.94万t,均居世界首位?。随着钼矿资源的
基金项目:中国博士后科学基金特别资助项目(2014T70691);中国有色矿业集团总公司科技项目(2013KJH06)
收稿日期:201412-09;修订日期:2015-06-18
通倍作者:甘敏,讲师;电话:13467517674;E-mai:csuganmin(@126.com