某磁选铁精矿实验室提质试验研究

发布时间：2018-07-05 00:52

本文选题：浮选 + 浮选柱　；参考：《中国矿业大学》2015年硕士论文

【摘要】：随着我国优质磁铁矿资源储量不断减少,细粒嵌布复杂难选磁铁矿石的开发利用变得越来越重要,而单一磁选工艺已很难适应日益恶化的矿石性质,这都迫使选厂选择合理工艺来生产优质铁精矿。浮选具有磁选工艺无法比拟的优势,能有效剔除铁精矿中夹带的细粒脉石矿物及含硅的铁矿物连生体,降低精矿中呈细粒嵌布的有害杂质含量。安徽某铁选厂采用阶段磨选-细筛分级-中矿再磨再选单一磁选工艺对该地区磁铁矿进行分选,第二段和第三段磁精矿品位分别在56%和64%左右,随着原矿性质不断变化,精矿品位波动较大,有时精矿品位只达到62%,而伴随炼钢厂对铁精矿质量的要求越来越高以及铁精矿价格下跌导致选厂效益不佳等因素,该工艺已很难满足现场需求,铁精矿提质重要性已日益凸显。本文以安徽某选厂二段磁精矿为研究对象,结合单矿物试验对安徽某选厂二段磁精矿进行提质试验研究。单矿物试验通过脂肪胺类捕收剂和醚胺类捕收剂GE-609,考察了捕收剂用量及矿浆p H值对石英及磁铁矿单矿物可浮性影响,并对比了不同捕收剂捕收性能,试验发现,在低药剂浓度下,脂肪胺类捕收剂捕收能力随着碳链长度增加而下降,GE-609捕收性能较十二胺稍差,且十二胺和GE-609较其它三种捕收剂在捕收性及选择性上较好。以十二胺为和GE-609为捕收剂,研究淀粉对石英和磁铁矿可浮性影响及不同粒级石英反浮选效果,结果表明,淀粉对石英可浮性影响较小,而对磁铁矿有一定抑制效果,低药剂浓度下,石英可浮性随着粒度增加而降低,高药剂浓度下,-0.154+0.1mm中间粒级石英较-0.2+0.154mm和-0.1+0.03mm可浮性较好,而-0.1+0.03mm粒级石英随着药剂浓度增加回收率几乎不变。实验室试验研究主要从矿样性质分析、实验室浮选机试验及实验室浮选柱试验三方面展开。以十二胺和GE-609为捕收剂,对比不同粒级矿物浮选效果,结果表明,十二胺捕收效果较GE-609好且-0.1mm粒级矿物浮选效果较好。以-0.1mm矿物作为浮选入料,进行浮选机药剂制度、矿浆等条件试验、浮选机工艺流程和浮选柱浮选流程探索,试验结果表明,采用浮选机一粗两精开路和浮选柱一粗一精浮选流程,均能获得品位67%以上的浮选铁精矿。采用分级-浮选-磁选工艺对该选厂二段磁精矿进行提质,对浮选泡沫及筛上粗颗粒这部分中矿,进行磨矿细度及磁场强度条件试验,并对分级-浮选机浮选-磁选和分级-浮选柱浮选-磁选提质工艺进行对比,结果表明,浮选柱一粗一精闭路浮选-中矿再磨磁选提质工艺总精矿产率和回收率最高,入磨中矿量是最少的,且相比于浮选机,浮选柱具有简化流程、对细粒级矿物分选指标好的优势,因此,选择分级-浮选柱一粗一精闭路浮选-中矿再磨磁选工艺作为最终铁精矿提质工艺,可获得总精矿产率67.02%、品位67.02%、回收率94.07%的良好指标。
[Abstract]:With the decrease of high quality magnetite reserves in China, the development and utilization of fine grained complex refractory magnetite has become more and more important, and the single magnetic separation process has been difficult to adapt to the deteriorating ore properties. This forced the separation plant to choose a reasonable process to produce high-quality iron concentrate. Flotation has the advantage that the magnetic separation technology can not be compared, can effectively eliminate fine gangue minerals and iron mineral conjunctions containing silicon in iron concentrate, and reduce the harmful impurity content of fine particles embedded in the concentrate. In a certain iron separation plant in Anhui Province, the single magnetic separation process of stage grinding, fine sifting and classifying of middle ore is used to separate magnetite in this area. The grade of the second and third stages of magnetic concentrate is about 56% and 64%, respectively, with the change of raw ore properties. The concentrate grade fluctuates greatly, sometimes the concentrate grade only reaches 62%, but with the higher and higher demand for the iron concentrate quality in the steelmaking plant and the low price of the iron concentrate, it is difficult to meet the field demand. The importance of improving quality of iron concentrate has become increasingly prominent. In this paper, the second stage magnetic concentrate of a certain dressing plant in Anhui Province is taken as the research object, and a single mineral test is used to study the quality improvement of the second stage magnetic concentrate of a certain dressing plant in Anhui Province. The effects of the amount of collector and pH value of pulp on the floatability of single mineral in quartz and magnetite were investigated by using adipose amine collector and ether amine collector GE-609. At low concentration, the capture ability of aliphatic amines decreased with the increase of carbon chain length, and the capture performance of GE-609 was slightly worse than that of dodecylamine, and that of dodecylamine and GE-609 was better than that of the other three kinds of collectors. Using dodecylamine as collector and GE-609 as collector, the effect of starch on floatability of quartz and magnetite and reverse floatation of quartz at different grain levels were studied. The results showed that starch had little effect on floatability of quartz, but had certain inhibitory effect on magnetite. At low concentration, the floatability of quartz decreases with the increase of particle size. At high concentration, the floatability of intermediate grade quartz of 0.154 0.1mm is better than that of -0.2 0.154mm and -0.1 0.03mm, while the recovery rate of -0.1 0.03mm grade quartz is almost unchanged with the increase of concentration. The laboratory test is mainly carried out from three aspects: the analysis of the ore sample, the laboratory flotation machine test and the laboratory flotation column test. Using dodecylamine and GE-609 as collectors, the flotation effects of different grain-grade minerals were compared. The results showed that dodecylamine was better than GE-609 and had a better flotation effect of -0.1mm. Using -0.1mm mineral as flotation feed, the flotation machine reagent system, pulp and other conditions were tested, flotation machine technological process and flotation column flotation process were explored. The experimental results showed that, Floatation iron concentrate with more than 67% grade can be obtained by floatation process of floatation machine with one coarse and two fine fineness and flotation column with one coarse and one fine floatation. In this paper, the secondary magnetic concentrate of the separation plant was extracted by the technology of class-floatation-magnetic separation, and the grinding fineness and magnetic field intensity conditions were tested for the flotation foam and the coarse particles on the screen. The results show that the total concentrate yield and recovery rate are the highest in the flotation column floatation-magnetic separation process, the closed circuit floatation-fine flotation process and the regrinding magnetic separation process for middle ore, and the results show that the total concentrate yield and recovery rate are the highest in the process of flotation, magnetic separation and separation with the classifier and flotation machine, and the results show that the total concentrate yield and recovery rate are the highest. Compared with flotation machine, flotation column has the advantages of simplified flow and good separation index for fine grained minerals. By selecting the classification-floatation-finely closed circuit floatation-middle ore regrinding magnetic separation process as the final iron concentrate extraction process, a good index of total concentrate yield of 67.02, grade of 67.02 and recovery of 94.07% can be obtained.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951

【参考文献】