钒钛磁铁矿的旋流器分级沉砂磁选抛尾试验研究

发布时间：2018-04-15 21:01

  本文选题：钒钛磁铁矿 + 一段沉砂　； 参考：《昆明理工大学》2015年硕士论文

【摘要】：钒钛磁铁矿是一种以铁、钒、钛为主,伴生多种有价元素(如铬、钴、镍、铜、钪、稼和铂族元素等)的多元共生复合铁矿,具有很高的综合利用价值。但是,随着矿产资源不断被开采,矿产资源越来越“贫、细、杂”化,钒钛磁铁矿的入选品位越来越低,预先抛尾的研究愈发显得重要。本文以攀钢集团矿业有限公司现有工艺流程和供矿条件为基础,以沉砂抛尾工艺的工业化应用为目标,优化相关技术设备；以一段旋流器分级沉砂的工艺矿物学研究为切入点,分别进行了沉砂工艺矿物学研究,磁选抛尾实验室试验,并在实验室研究基础上,进行了工业化试验研究。通过对一段磨选的原矿、尾矿及旋流器分级沉砂的化学多元素分析、粒度组成测定及单体解离度分析,结果表明：沉砂主要由钛磁铁矿、钛铁矿、硫化物和脉石等四大类组成,从抛尾的角度把钛铁矿、硫化物、脉石一起视为综合脉石矿物,综合脉石矿物含量约占45%,单体解离度很高。在工艺矿物学研究的基础上进行了实验室试验,在场强0.2T时,沉砂磁选抛尾可获得精矿产率68.19%、精矿TFe品位45.67%、精矿回收率87.16%、尾矿TFe品位14.42%、抛尾率31.81%的指标,抛尾尾矿中强磁性矿物损失量较小,处于合理范围内；实验室试验研究的结果显示沉砂抛尾工艺是可行的。本论文在其实验室研究的基础上,对其进行了工业试验研究,探索合适的沉砂抛尾的工业应用工艺流程。根据现场实际条件,分别进行了两种工艺流程的工业试验研究,第一种抛尾粗精矿高浓度自流进入一段球磨机的试验流程,该流程简单明了地实现了沉砂抛尾工艺,但是受原有厂房结构限制,为了保证粗精矿高浓度自流和一段球磨高浓度磨矿,只能运行1台抛尾磁选机；第二种抛尾粗精矿经旋流器脱水后进入一段球磨机的试验流程,该流程突破了原有厂房结构的限制,能够运行2台抛尾磁选机。两种沉砂抛尾工艺流程的工业试验结果显示,采用带溢流的底箱顺流型磁选机、磁选抛尾给矿浓度为45%-65%、调整一段分级旋流器沉砂嘴直径Φ130mm的情况下,采用流程Ⅰ和流程Ⅱ都能使流程运行均通畅；返砂比降低50%以上,基本低于200%；一段旋流器分级量效率提高约8-10个百分点,质效率提高约2个百分点；在确保铁精矿品位略增高的情况下,一段球磨台时处理量提高幅度9～10%,但需要的水量增加较多,需对循环水系统进行改造。两个工艺流程均能较大幅度提高系统产量,但相比之下,采用抛尾粗精矿高浓度自流进一段球磨的工艺流程运行成本较低,生产不加水量也较少。
[Abstract]:Vanadium titanomagnetite is a kind of complex iron ore which is composed mainly of iron, vanadium and titanium, accompanied by many valuable elements (such as chromium, cobalt, nickel, copper, scandium, Jia and platinum-group elements), and has high comprehensive utilization value.However, with the exploitation of mineral resources, mineral resources are becoming more and more "poor, fine, miscellaneous", vanadium titanomagnetite is of lower and lower grade, and the study of tail-throwing is becoming more and more important.Based on the existing technological process and ore supply conditions of Panzhihua Iron and Steel Group Mining Co., Ltd, the paper optimizes the relevant technical equipment with the aim of industrialized application of sand settling and tail-throwing process, and starts with the process mineralogical research of the primary stage cyclone for graded sand settling.The mineralogical study of sand settling process and the laboratory test of magnetic separation and tail-throwing were carried out, and on the basis of the laboratory research, the industrial test was carried out.Through chemical multielement analysis, particle size determination and monomer dissociation analysis of primary grinding ore, tailings and cyclones, the results show that the settling sand is mainly composed of four categories: titanomagnetite, ilmenite, sulphide and gangue.From the point of view of tail-throwing, ilmenite, sulphide and gangue are regarded as comprehensive gangue minerals together. The content of synthetic gangue minerals is about 455.The degree of monomer dissociation is very high.Based on the study of process mineralogy, laboratory tests were carried out. When the intensity was 0.2T, the concentrate yield was 68.1919, the concentrate TFe grade was 45.67, the concentrate recovery rate was 87.16%, the tailings TFe grade was 14.42%, and the tail throwing rate was 31.81%, when the concentration was strong 0.2 T, the concentrate yield was 68.19, the concentrate TFe grade was 45.67, the tailings recovery was 87.16%, and the tailings TFe grade was 14.42%.The loss of strong magnetic minerals in tailings is relatively small and within a reasonable range, and the results of laboratory tests show that the process of tailings sinking is feasible.On the basis of its laboratory research, this paper has carried on the industrial experiment research to explore the suitable industrial application technological process of sand sinking and tail-throwing.According to the actual conditions on the spot, two kinds of industrial experiments were carried out respectively. The first one is the test flow of the high concentration self-flow of the tail-throwing coarse concentrate into the first stage ball mill. The process is simple and clear to realize the process of sand sinking and tail-throwing.However, due to the limitation of the original factory structure, in order to ensure the high concentration of the coarse concentrate and the high concentration grinding of the first stage of ball mill, only one tail-throwing magnetic separator can be operated; the second kind of coarse concentrate can be dewatered by the cyclone and enter the test process of the first stage ball mill.The process breaks through the limitation of the original plant structure and can run 2 tail-throwing magnetic separators.The industrial test results of two kinds of sand settling and tail-throwing processes show that under the condition of adopting the bottom box downstream magnetic separator with overflow, the feed concentration of magnetic separation and throwing tail is 45 ~ 65, and the diameter of sand nozzle 桅 130mm is adjusted, the diameter of the sand nozzle of the first stage cyclone is adjusted.Both process 鈪，

本文编号：1755766