摘要
在对某碳酸盐型高泥萤石矿的选矿试验中,采用了新型抑制剂和新的流程:在常规条件下通过一次粗选脱除大部分矿泥和部分方解石,然后再进行方解石和萤石的浮选分离,经过一段磨矿—两粗—五精—两扫的选别流程获得了合格的精矿;其中精矿中CaF2品位95.37%,CaCO3品位3.06%,CaF2回收率76.61%,最终尾矿CaF2品位12.36%.研究表明,改性水玻璃NSOH中对方解石起主要抑制作用的为胶态硅酸和SiO2(OH)22-离子,并得出各组分对矿物抑制能力的顺序:SiO2(OH)22->Si(OH)4>HSiO3-.其抑制作用主要是由于不同矿物对胶态硅酸和SiO2(OH)22-离子的吸附能力不同,其中吸附能力强的矿物容易被水玻璃抑制,而那些吸附不牢固或基本不吸附硅酸和SiO2(OH)22-离子的矿物就不容易被抑制或基本不被抑制.
A new type depressant was introduced in the flotation test of a certain fluorite ore containing carbonates and lots of sludge. Part of calcite and most of fluorite were separated from sludge by bulk flotation under conventional conditions through a rougher as first step, then the fluorite and calcite were separated by another rougher. A process of several steps in cleaning flotation was needed to obtain desirable fluorite concentrates, including the grinding once, roughing twice, clean-out five times and scavenging twice successively. The contents of CaF2 and CaCO3 in concentrate are 95.37% and 3.06%, respectively, with a recovery rate of CaF2 76.61% and the grade of CaF2 in tailing 12.36%. Theoretical study showed that Si(OH)4 and SiO2(OH)2^2- are the main components to depress calcite mineral in modified sodium silicate and the sequence of depressibility is SiO2 (OH) 2^2- 〉 Si(OH)4 〉HSiO3^-. The depressibility was mainly due to the different adsorbabilities of Si (OH)4 and SiO2 (OH)2^2- for different minerals among which the highly adsorbable ones are easy to be depressed, while those minerals which cannot adsorb Si(OH)4 and SiO2 (OH)2^2- firmly even are unable to adsorb them are not easily to be depressed or cannot be depressed at all.
出处
《东北大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2009年第2期287-290,共4页
Journal of Northeastern University(Natural Science)
基金
教育部新世纪优秀人才支持计划项目(NCET-05-0291)