泗阳县中小学食堂财务管理办法.doc

doi:.1007-
低品位铝土矿预富集铝镓的研究
徐璐,史光大,李元坤,钟庆文,罗宇智,余平
(中国地质科学院矿产综合利用研究所,中国地质调查局金属矿产资源综合利用技术研究中心,成都 610041)
摘要:采用正交试验研究某脱硫铝精矿的溶出性能,并探索从拜耳法母液中提取铝和镓富集物。结果表明,当晶种分解时间为72 h,%,获得的Al(OH)3产品中氧化铝含量大于62%。当吸附时间为2 h,吸附温度为45 ℃的条件下,四级吸附后,%,再通过盐酸洗脱、中和沉淀和焙烧工艺后,%,%,可用于进一步制备高纯氧化镓产品。
关键词:低品位铝土矿;高压溶出;氧化铝;氧化镓;预富集
中图分类号: 文献标志码:A 文章编号:1007-7545(2018)03-0000-00
Study on Pre-enrichment of Aluminum and Gallium from Low Grade Bauxite
XU Lu, SHI Guang-da, LI Yuan-kun, ZHONG Qing-wen, LUO Yu-zhi, YU Ping
(Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chinese Geological Survey Metal Mineral Resource Utilization Technology Center, Chengdu 610041, China)
Abstract:Digestion performance of one low grade bauxite was developed by orthogonal, and extraction of aluminum and gallium from Bayer liquor was explored. The results show that position rate of Al2O3 in sodium aluminate solution is % with alumina content of 62% above after seed precipitation of 72 h. After four-stage adsorption, total adsorption rate of gallium is % under the optimum conditions including adsorption time of 2 h and adsorption temperature of 45 ℃. Total recovery of gallium is % by hydrochloric acid elution, ammonia precipitation and roasting. The obtained concentrate Ga2O3 content of % can be used to produce high purity gallium oxide products.
Key words:low grade bauxite; high-pressure dissolution; alumina; gallium oxide; pre-enrichment
重庆铝土矿主要为含一水硬铝石的沉积型铝土矿矿床,矿体主要呈层状、似层状、透镜状产出,矿石主要为土状、半土状、碎屑状、致密块状结构构造。重庆铝土矿储量大,以中高硫中低品位矿石为主,有益元素除铝外,还伴生有丰富的稀散元素镓和钪,极具综合利用价值。拜耳法处理铝土矿过程中,晶种分解NaAlO2(含Na、Ga)溶液,产出分解后溶液。经多次循环后,原料中80%~85%的镓富集于拜耳法母液,~ g/L, g/L,可以定期从中抽取部分溶液用以提取镓[1-7]。
1 试验
试验原料
原矿取自重庆某地,,经破碎、浮选脱硫脱硅等工艺后,获得铝精矿,原矿及浮选铝精矿的定量多元素分析结果如表1所示。
表1 原矿及铝精矿的主要化学成分
Table 1 Main position of raw ore and concentrate /%
名称
Al2O3
SiO2
Sc*
Ga*