利用银山矿半自磨顽石做立磨机介质的磨矿试验研究
发布时间：2019-03-04 17:20
【摘要】：随着我国铜矿石的大规模开发,矿石开采品位越来越低,矿物嵌布粒度越来越细。传统的两段球磨工艺难以达到细度要求,需要采用立式搅拌磨等设备进行细磨。由于立式搅拌磨采用钢球作为磨矿介质,铁质容易污染矿物表面,导致矿物可浮性变化大,影响到选别指标。本文针对江铜集团银山选厂的再磨系统,提出了利用半自磨排出的部分顽石作为立磨机的磨矿介质进行再磨的新思路,减轻了铁质污染,节约了磨矿成本。整个磨矿工艺可用半自磨+球磨+破碎+顽石立磨来表示。本文利用顽石具有一定的力学性质和机械强度这种特性,进行了顽石自磨试验,验证顽石作为磨矿介质的可行性。然后在实验室中研究了磨矿操作参数对顽石磨矿过程的影响,确定了顽石磨矿的最佳条件及顽石的消耗量,计算出顽石替代钢球的方法和顽石介质的尺寸大小;最后进行了顽石替代钢球的现场工业试验,稳定生产后,进行了指标考查和经济效益计算。得出以下研究结果:1、JK落重冲击试验和研磨试验表明,矿石的抗冲击破碎能力属于JK数据库“中”等级范畴,矿石的抗研磨能力属于JK数据库“中硬”等级范畴,矿石抗研磨能力较强;随着矿石开采深度的增加,矿石抗压强度增加,半自磨产生的顽石强度也愈大,有利于作为磨矿介质,抗压强度最大的顽石直径分布在30-40mm之间。顽石在立磨机中自磨时,磨损部分细度-0.045mm大于69.89%,达到了磨矿产品细度要求。2、实验室中顽石磨矿的最佳磨矿条件为:磨矿样量5 kg,磨矿时间为3min,磨矿浓度为65%,介质充填率为60%。磨矿产品的细度为56%,此时现场顽石的消耗量为13.3t/d。3、顽石、与顽石等质量钢球、等比表面积钢球和等体积钢球这四种磨矿介质的研究发现,顽石与等质量的钢球具有相同磨矿效果。在相同的磨矿细度下,顽石介质的磨矿产品粒度组成更加合理,且减少了铁质污染,浮选更加稳定,精矿回收率更高。4、顽石取代钢球工业试验表明,在达到旋流器溢流细度-0.045mm占80%前提下,浮选给料中易选合格增加了7.37%,二段铜硫回收率提高了1.2个百分点,总回收率提高0.9个百分点以上;立磨机的电耗降低了16.67%,年产生经济效益572.29万元。
[Abstract]:With the large-scale exploitation of copper ore in China, the ore mining grade becomes lower and lower, and the particle size of mineral embedding becomes more and more fine. The traditional two-stage ball milling process is difficult to meet the requirements of fineness, so it is necessary to use vertical stirring mill and other equipment for fine grinding. Because steel ball is used as grinding medium in vertical agitation mill, iron is easy to pollute mineral surface, which leads to great change of floatability of mineral and affects separation index. In view of the regrinding system of Yinshan Concentrator of Jiangcopper Group, a new idea of regrinding using some recalcitrant stone discharged from semi-self-grinding as grinding medium of vertical mill is put forward in this paper. The iron pollution is reduced and the grinding cost is saved. The whole grinding process can be represented by semi-self-grinding ball mill crushing recalculating stone vertical mill. Based on the mechanical properties and mechanical strength of recalcitrant rock, the self-grinding test of recalcitrant stone is carried out to verify the feasibility of refractory stone as grinding medium. Then, the influence of grinding operation parameters on refractory stone grinding process is studied in laboratory, the optimum condition of refractory stone grinding and the consumption of recalcitrant stone are determined, and the method of replacing steel ball with refractory stone and the size of refractory medium are calculated. Finally, the field industrial test of refractory stone replacing steel ball is carried out. After stable production, the index check and economic benefit calculation are carried out. The results are as follows: 1. The drop weight impact test and grinding test of JK show that the impact crushing resistance of the ore belongs to the "grade" category in the JK database, and the grinding resistance of the ore belongs to the category of "hard" in the JK database. The ability of anti-grinding of ore is strong; With the increase of the ore mining depth, the compressive strength of the ore increases, and the recalcitrant strength produced by semi-self-grinding increases, which is beneficial to be used as grinding medium. The diameter of the refractory rock with the largest compressive strength is distributed between 30-40mm. When the recalcitrant stone is self-grinding in the vertical mill, the wear part fineness-0.045mm is more than 69.89%, which meets the grinding product fineness requirement. 2. The optimum grinding condition of the refractory stone grinding in the laboratory is as follows: grinding sample volume of 5 kg, grinding time is 3 min, The grinding concentration is 65% and the filling rate is 60%. The fineness of the grinding product is 56%, and the consumption of refractory stone in the field is 13.3t 路d. 3. The study of the four grinding media, such as the mass steel ball, the equal specific surface area steel ball and the equal volume steel ball, of the refractory stone and the recalcitrant stone, has found that there are four kinds of grinding medium. The recalcitrant stone has the same grinding effect as the steel ball of equal mass. Under the same grinding fineness, the grain size composition of grinding product of refractory stone medium is more reasonable, and the iron pollution is reduced, the flotation is more stable and the recovery of concentrate is higher. 4. The industrial test of refractory stone replacing steel ball shows that On the premise that the hydrocyclone overflow fineness-0.045mm accounts for 80%, the eligible separation rate in flotation feed is increased by 7.37%, the recovery rate of copper and sulfur in the second stage is increased by 1.2 percentage points, and the total recovery rate is increased by more than 0.9 percentage points. The power consumption of the vertical mill is reduced by 16.67% and the annual economic benefit is 5.7229 million yuan.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD921.4;TD952
本文编号：2434465
[Abstract]:With the large-scale exploitation of copper ore in China, the ore mining grade becomes lower and lower, and the particle size of mineral embedding becomes more and more fine. The traditional two-stage ball milling process is difficult to meet the requirements of fineness, so it is necessary to use vertical stirring mill and other equipment for fine grinding. Because steel ball is used as grinding medium in vertical agitation mill, iron is easy to pollute mineral surface, which leads to great change of floatability of mineral and affects separation index. In view of the regrinding system of Yinshan Concentrator of Jiangcopper Group, a new idea of regrinding using some recalcitrant stone discharged from semi-self-grinding as grinding medium of vertical mill is put forward in this paper. The iron pollution is reduced and the grinding cost is saved. The whole grinding process can be represented by semi-self-grinding ball mill crushing recalculating stone vertical mill. Based on the mechanical properties and mechanical strength of recalcitrant rock, the self-grinding test of recalcitrant stone is carried out to verify the feasibility of refractory stone as grinding medium. Then, the influence of grinding operation parameters on refractory stone grinding process is studied in laboratory, the optimum condition of refractory stone grinding and the consumption of recalcitrant stone are determined, and the method of replacing steel ball with refractory stone and the size of refractory medium are calculated. Finally, the field industrial test of refractory stone replacing steel ball is carried out. After stable production, the index check and economic benefit calculation are carried out. The results are as follows: 1. The drop weight impact test and grinding test of JK show that the impact crushing resistance of the ore belongs to the "grade" category in the JK database, and the grinding resistance of the ore belongs to the category of "hard" in the JK database. The ability of anti-grinding of ore is strong; With the increase of the ore mining depth, the compressive strength of the ore increases, and the recalcitrant strength produced by semi-self-grinding increases, which is beneficial to be used as grinding medium. The diameter of the refractory rock with the largest compressive strength is distributed between 30-40mm. When the recalcitrant stone is self-grinding in the vertical mill, the wear part fineness-0.045mm is more than 69.89%, which meets the grinding product fineness requirement. 2. The optimum grinding condition of the refractory stone grinding in the laboratory is as follows: grinding sample volume of 5 kg, grinding time is 3 min, The grinding concentration is 65% and the filling rate is 60%. The fineness of the grinding product is 56%, and the consumption of refractory stone in the field is 13.3t 路d. 3. The study of the four grinding media, such as the mass steel ball, the equal specific surface area steel ball and the equal volume steel ball, of the refractory stone and the recalcitrant stone, has found that there are four kinds of grinding medium. The recalcitrant stone has the same grinding effect as the steel ball of equal mass. Under the same grinding fineness, the grain size composition of grinding product of refractory stone medium is more reasonable, and the iron pollution is reduced, the flotation is more stable and the recovery of concentrate is higher. 4. The industrial test of refractory stone replacing steel ball shows that On the premise that the hydrocyclone overflow fineness-0.045mm accounts for 80%, the eligible separation rate in flotation feed is increased by 7.37%, the recovery rate of copper and sulfur in the second stage is increased by 1.2 percentage points, and the total recovery rate is increased by more than 0.9 percentage points. The power consumption of the vertical mill is reduced by 16.67% and the annual economic benefit is 5.7229 million yuan.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD921.4;TD952
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