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    某大型铜矿球磨机提高磨矿效率的实践研究

    技术应用 | 来源:本网 | 发布日期:2017-10-26 查看次数:536

    核心提示:  某大型铜矿球磨机提高磨矿效率的实践研究邓东锋(陕西有色集团有限公司陕西银矿,西安710068)等四个方面的技术研究,制定了提高效率的方案,在较低投入的基础上进行了技术改造,使球磨机处理能力提高了2

      某大型铜矿球磨机提高磨矿效率的实践研究邓东锋(陕西有色集团有限公司陕西银矿,西安710068)等四个方面的技术研究,制定了提高效率的方案,在较低投入的基础上进行了技术改造,使球磨机处理能力提高了25%,磨矿细度更加符合选矿需要。不但创造了巨大的经济效益,也降低了每吨矿石的能源消耗,具有很高的实用价值。

      球磨机是选矿厂生产的关键设备。无论是在矿山建设投资中,还是在矿山生产期间的成本管理中,球磨机都占有很高的比重。特别是在矿山进入稳定的生产阶段,球磨机的材料和能源消耗占到选矿厂生产总成本的45%以上。同时,球磨机作为主要生产设备,其运转率和效率常常决定了全厂的生产效率和指标,影响着选厂能否按设计要求达产达标。因此,提高球磨机的磨矿效率已经是各个矿山企业研究的重要课题之。

      获各琦铜矿选矿厂经多次改扩建形成了200万t/a的生产规模,设备设施和工艺流程相对较为保守,设计上没能按照新型现代化选矿厂的标准进行,而是沿用了传统的工艺和设备,新扩建的100万t/a的球磨机选型时采用了3台少3254溢流型球磨机。这样就限制了选矿厂整体产能的突破,并影响了选矿作业指标的提高。此次技术改造就是为了实现选矿厂产能的最大释放,提高企业经济效益。

      经过对矿石性质的分析和研究,结合大量的考察和试验,公司得出了行之有效的改造方法。其中,重点就是对球磨机进行技术改造,提高球磨机的磨矿效率,使单位时间内生产出更多符合入选要求的合格磨矿产品。生产实践证实磨矿时间过长球磨机的能耗和钢耗增加,生产效率降低,并将产生过磨(过粉碎)现象,对选矿流程的通畅和精矿脱水都将造成不利影响。所以,提高排矿速度适当缩短磨矿时间和合理搭配磨矿介质都可以降低矿石的过粉碎现象。缩短磨矿时间也是提高球磨机效率的条有效途径1. 1方案确定1.1磨矿工艺简介选矿厂的球磨配置总体分为两个系统,分别为旧磨矿系统和扩建后的新磨矿系统,共有球磨机七台。旧磨矿系统一段磨机为3台格子型球磨机(即机为1台溢流型(即3MQY2836),形成两段闭路磨矿流程;新磨矿系统为3台溢流型球磨机(即3台MQY3254球磨机,代号5、6、7),各自与分级机组成三个独立的一段闭路磨矿流程(1、2、4球磨机溢流经3再磨后分配到1系列和2系列浮选,球磨机溢流可任意组合成2:1的比例分别进入4系列和5系列浮选)。

      本次研究主要是针对新磨矿系统的3台球磨机,通过改造使磨矿效率得到提高,并为浮选作业提供更适合的入选矿浆。磨矿流程布置见。

      磨浮车间设备联系。2矿石性质分析了增产提效的目的,又不影响选矿回收率指标0.根据对原矿性质的研究和选矿试验结论,认为原矿多元素分析结果见表1,铜物相分析结果见新系列少3254球磨机筒体较长,有利于提高磨矿细表2.度,如果能通过技术改造提高球磨机的台效,既解决表1原矿多元素分析结果元素含量1)单位为g/t矿石中铜主要赋存于硫化物黄铜矿及方黄铜矿中,占总铜含量的96%左右。黄铜矿主要呈它形粒状集合体嵌布于脉石中,集合体粒度较粗;其次呈脉状、乳滴状、蠕虫状及不规则状嵌布于脉石中,粒度相对较细。

      表2铜的物相分析结果铜物相含量分布率备注硫化铜方铅矿等氧化铜白铅矿、铅矾等总铜94t/m3,普氏硬度为/= 10~12,平均出矿品位为0.9%~1.3%,矿石的可选性较好,入选细度-74m含量65%以上即能得到较高的选矿回收率,随着磨矿细度的提高回收率将进一步提高,但当磨矿细度超过-74pm75%时回收率趋于稳定3.同时,磨矿细度的提高会使磨矿成本急剧增加2,试验结果见表3和表4.表3磨矿细度对比试验结果磨矿细度产品名称产率品位回收率粗精矿中矿尾矿原矿粗精矿中矿尾矿原矿粗精矿中矿尾矿原矿粗精矿中矿尾矿原矿粗精矿中矿尾矿原矿表4磨矿时间与磨矿细度的关系磨矿时间/min含量/% 1.3球磨机排矿形式对磨矿效率的影响根据格子型球磨为低水平强制排矿,球磨机内储存的矿浆少,己磨细的矿粒能及时排出的特点。同时,过粉碎率比溢流型有所降低,磨矿速度较快。北京:当代中国音像出版社,2005:李启衡。碎矿与磨矿M.北京:冶金工业出版社,1989:郭万进。提高霍各乞铜矿磨矿细度的实践。有色金属郎平振,饶绮麟。矿石泥化对碎磨工艺的影响。有色金唐新民。提高磨机处理能力和能源利用率的研究。矿山机械,2003,30(1)(上接第46页)潘思贵。平果岩溶堆积型铝土矿地质特征及成矿模式探刘长星,付蕾,井涛。卧螺离心机含油污泥脱水试验任欣,田园,厉青。沉降过滤式离心机技术参数对煤泥分离效果的影响。煤炭学报,2007,32(2):206210.王文志。离心机分离效果的影响因素。聚酯工业,王思哲,梁云平。对影响卧螺离心机脱水效果因素的探讨王淦。卧螺离心机与带式压滤机的比较。工业用水

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