鳞片石墨再磨工艺及浮选速率研究

发布时间：2018-05-08 20:08

本文选题：鳞片石墨 + 磨矿　；参考：《武汉理工大学》2015年硕士论文

【摘要】：我国大鳞片石墨资源相对匮乏,石墨产品中以鳞片石墨用途最为广泛,需求量最大,且其价值与鳞片尺寸和品位成正比。但鳞片石墨传统磨浮工艺普遍对石墨鳞片破坏较大,因此针对不同嵌布粒度的鳞片石墨矿石,合理选择再磨工艺具有重大意义。鳞片石墨由于嵌布粒度不同其浮选性质也有所差异,针对甘肃民勤鳞片石墨矿(1#矿)和黑龙江萝北鳞片石墨矿(2#矿)两种不同嵌布粒度的鳞片石墨矿石分别进行了矿石性质、粗选条件、开路试验及浮选速率研究,得出以下结论:矿石性质研究表明,1#矿和2#矿固定碳含量分别为4.45%、9.29%,1#矿石脉石矿物以石英为主,其次为长石类、云母类、透闪石、绿泥石等;2#矿石脉石矿物中石英和透辉石含量较高,其次为长石类、云母类、透闪石、方解石,还含有少量黄铁矿等。1#矿石墨嵌布粒度较细,+0.15mm粒级的石墨颗粒数累计比为3.1%,粒径在-0.052mm以下的颗粒较多,累计比为58.65%。;2#矿石墨嵌布粒度较粗,+0.15mm粒级石墨颗粒数累计比为10%。粗选条件试验表明,1#矿较优的粗选磨矿细度为-0.074mm66.68%,煤油用量为400g/t,2#油用量为60g/t,浮选浓度20%,矿浆pH值为8.5;2#矿较优的粗选磨矿细度为-0.074mm45.11%,煤油用量为348g/t,2#油用量为66g/t,浮选浓度20%,矿浆pH值为8.5。开路试验表明,1#和2#矿经四次再磨五次精选球磨开路流程,可分别获得固定碳含量为96.13%、96.49%的石墨精矿;1#和2#矿分别经五次再磨六次精选棒磨和四次再磨五次精选棒磨开路流程,分别获得固定碳含量为95.77%、96.01%的石墨精矿。1#矿球磨和棒磨开路流程精矿中+0.15mm粒级产率均不足3%,棒磨略高于球磨,但棒磨磨矿效率远低于球磨;2#矿球磨和棒磨开路流程精矿中+0.15mm粒级石墨含量分别为9.56%、11.38%,棒磨可对石墨鳞片起到较好的保护作用。浮选速率试验表明,2#矿的浮选速率常数较1#矿高,均随煤油、2#油用量的增加而逐渐升高,随浮选浓度的增加而降低,过高或过低的矿浆pH值均会导致浮选速率降低。可通过控制刮泡时间,适量增加煤油用量,降低2#油用量以及浮选浓度达到提前回收部分石墨鳞片的目的。
[Abstract]:The resources of large flake graphite in China are relatively scarce. Among the graphite products, flake graphite is the most widely used and the demand is the greatest, and its value is proportional to the size and grade of the scale. However, the traditional floatation process of flake graphite has great damage to the graphite flake, so it is of great significance to choose the reasonable regrinding process for the flake graphite ore with different size. The floatation properties of flake graphite are also different because of the different size of sheet graphite. The mineral properties of flake graphite ore with different size distribution are studied, aiming at the scale graphite ore of Minqin, Gansu province) and the scale graphite ore of Luobei, Heilongjiang province. The results show that the fixed carbon content of the ore is 4.45 ~ 9.29 ~ (th) ~ (th), followed by quartz, feldspar, mica, tremolite, etc. The contents of quartz and diopside in gangue minerals of chlorite etc. ore are relatively high, followed by feldspar, mica, tremolite, calcite, etc. There is also a small amount of pyrite ore, such as pyrite ore. The size of ink-inlaid cloth is fine, the cumulative ratio of graphite particles of 0.15mm grain-grade is 3.1, the particle size of which is less than -0.052mm, the accumulative ratio is 58.65.b.2#, and the accumulative ratio of 0.15mm grain-grade graphite particles is 10. The results of roughing test show that the optimum grinding fineness is -0.074 mm 66.68, the amount of kerosene is 400 g / tni2# oil is 60 g / t, the flotation concentration is 20, the pulp pH is -0.074 mm 45.11, the amount of kerosene is 348 g / t, the floatation concentration is 20, the pulp pH is 8.5m.The crude grinding fineness is -0.074 mm 45.11, the amount of kerosene is -0.074 mm / t, the flotation concentration is 20 g / t, the pulp pH value is 8.5% 路m ~ (-1), the crude grinding fineness is -0.074 mm ~ (-) 66.68 mm, the flotation concentration is 20 g / t, the pulp pH value is 8.5%. The open circuit test shows that the open circuit flow of graphite concentrate with a fixed carbon content of 96.13% and 96.49% can be obtained by four times regrinding and five times of ball milling, respectively, and the open-circuit process of graphite concentrate with fixed carbon content of 96.13% and 96.49% can be obtained by five times regrinding and five times regrinding respectively. Graphite concentrate with 95.7777% and 96.01% of fixed carbon were obtained from ball mill and rod mill open circuit process respectively. The yield of 0.15mm particles in the concentrate was less than 3%, and the rod mill was slightly higher than that of ball mill. However, the efficiency of rod mill is much lower than that of ball mill and rod mill. The content of 0.15mm grain-grade graphite in the concentrate of ball mill and rod mill is 9.56 ~ 11.38, respectively. The flotation rate test shows that the flotation rate constant of the ore is higher than that of the 1# mine, and the flotation rate increases gradually with the increase of kerosene oil content, and decreases with the increase of flotation concentration. Too high or too low pH value of slurry will lead to the decrease of flotation rate. By controlling the blowing time, increasing the amount of kerosene in proper amount, reducing the amount of oil in 2# and the concentration of floatation, some graphite flakes can be recovered in advance.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD97;TD923

【参考文献】