摘要
湖南某萤石矿中CaF品位为25.16%,硅、铝含量较高,属低品位难选萤石矿资源,为有效回收该矿石中的萤石资源,进行了详细的选矿试验研究。结果表明,该矿石易于碎磨,其中萤石品位还存在粒级偏析现象,即在粗级别和细级别颗粒的矿石中萤石品位偏高,呈“哑铃型”分布。根据萤石的分布特性,需进行预先分级处理后再进入磨浮作业,并通过逐级优化的条件试验,最终确定在磨矿细度为-0.074mm占85.63%的情况下,以羧甲基纤维素和木质磺酸钠作为组合调整剂,用量为500 g/t+900 g/t。水玻璃作为抑制剂,用量为1500 g/t,磺化油酸作为捕收剂,用量为800g/t。制定了1次粗选8次精选3次扫选,中矿逐级返回的闭路流程,得到CaF品位96.18%、回收率85.59%的萤石精矿,实现了对该矿石中萤石资源的高效回收利用。
The fluorite ore from a fluorite deposit in Hunan province have CaFgrade of 25.16%,with relatively high contents of silicon and aluminum.It belongs to low-grade and difficult dressing fluorite resource.In order to effectively recover the fluorite resource in this kind of ore,a detailed beneficiation experiment has been carried out.The results show that the ore was easily grinded.There is a particle segregation phenomenon,for fluorite grades of different sized grinded ores,which means that the fluorite grades of relatively coarse grained and fine grained ores are higher than that of medium sized ore,presenting a dumbbell type distribution for fluorite grades of ores in sizes varying from coarse to fine ones.According to the distribution characteristics of fluorite,it is necessary to carry out pre-classification treatment of raw fluorite ore before entering the grinding and flotation operations,and then to conduct the step by step optimization condition test for the floatation of ore.Finally,we have determined parameters of the optimized condition.The grinding fineness of over 85.63%ore should be less than 0.074 mm.Carboxymethyl cellulose and sodium lignosulfonate are used as the combined regulator,with their respective dosages of 500 g/t and 900 g/t.Sodium silicate is used as inhibitor,with dosage of 1500 g/t.Sulfonated oleic acid is used as collector,with dosage of 800 g/t.A closed-circuit process,of one time of roughing,eight times of cleanings,three times of sweepings,and the stage-by-stage returning of medium grained ores,has been developed.Through the flotation of this process,the fluorite concentrate with CaFgrade of 96.18%has been obtained with a recovery rate of 85.59%.This flotation process has made the highly efficient recovery and utilization of fluorite resource in this deposit.
作者
高亚龙
刘全军
董敬申
盛洁
刘美琳
GAO Ya-long;LIU Quan-jun;DONG Jing-shen;SHENG Jie;LIU Mei-lin(Facultyof Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metals Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2022年第6期840-846,共7页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(编号:51764021)。
关键词
萤石
粒级偏析
预先分级
浮选
fluorite
grain size segregation
pre-classification
flotation