摘要
河南登封地区的铝土矿属高铝、高硅、低铝硅比型铝土矿,其工艺矿物学表明,矿石中各矿物嵌布关系复杂,嵌布粒度细,造成矿石的洗选困难。通过选矿试验,最终确定了重选和浮选相结合工艺流程,试验结果表明,在磨矿粒度-0.074mm占95%时,通过重选能够得到铝硅比8.12的合格精矿,对摇床的中矿和尾矿分别进行浮选试验,得到中矿浮选的药剂最佳用量为碳酸钠500g/t,皂化油酸500g/t,尾矿浮选的药剂用量为碳酸钠3000g/t,六偏磷酸钠60g/t,皂化油酸800g/t;通过全流程闭路试验,铝土矿铝硅比由3.28提高到7.66,精矿氧化铝回收率为61.13%,达到生产氧化铝工业用铝土矿三级标准。Si O2含量由原矿的16.76%降为8.67%,脱硅效果明显。
The bauxite is of high alumina, high silica and low ratio of alumina to silica in Dengfeng of Henan province. The process mineralogy showed that alumina and silica minerals were complex associated and finely disseminated, which were the main reasons of difficulty in flotation. The technological process combined with the gravity concentration and flotation was determined after tests. The results showed that - 0. 074mm contents of the optimum grinding fineness was 95%, the ratio of alumina to silica of gravity concentration was 8.12, the flotation of gravity middlings and tailings were respectively conducted, the optimum collecting agents for middlings separation were 500g/t Na2 CO3 and 500g/t modified oleic acid, and for the tailings they were 3000g/t Na2CO3 , 60g/t sodium hexametaphosphate（SHMP）, and 800g/t modified oleic acid. Under the closed - circuit process, the alumina - silica ratio was improved from 3.28 to 7.66, and alumina recovery reached 61.13 % , which completely met the Class Ⅲ standard of industrial production. The content of SiO2 dropped from 16.76% of crude ore to 8.67%, and the de - silication result was evident.
出处
《轻金属》
CSCD
北大核心
2015年第9期1-5,11,共6页
Light Metals
关键词
铝土矿
重选
浮选脱硅
bauxite
gravity concentration
flotation desilication
