铸铁段作细磨介质的破碎效果

采用普通钢球作为对比,研究磨矿过程中以铸铁段为细磨介质的破碎效果。结果表明,铸铁段的磨碎能力与钢球组相当,磨矿产品都符合罗逊-莱蒙勒尔粒度特性分布曲线,且服从y=100exp(-bxn)指数分布。在相同的磨矿细度条件下,铸铁段比钢球的磨机生产能力增加8．6％,过粉碎轻3．96个百分点,合格粒级增加3．99个百分点。铸铁段可以取代钢球成为细磨作业的新型介质。     

铸铁段作为磨矿介质在冬瓜山铜矿的试验研究

以冬瓜山铜矿矿石为研究对象,运用精确化装补球技术,精确的计算出初装球的球径和球比,并根据质量相当的原则,用耐磨铸铁段替换钢球作为磨矿介质,最终确定了50 mm×60 mm∶35 mm×40mm∶30 mm×35 mm=30∶25∶45的球磨机初装比方案,然后通过普通钢球与耐磨铸铁段的对比试验来研究磨矿过程中铸铁段作为磨矿介质的磨矿效果。试验结果表明,在相同的磨矿条件下,铸铁段的中间易选级别比现场方案提高了13.43个百分点,过粉碎比现场方案降低了2.53个百分点,磨矿细度比现场方案提高了7.89个百分点,铸铁段可以取代钢球作为新型磨矿介质。     

新型细磨介质的材质选择及应用研究

介绍了细磨介质的种类及影响因素,提出了一种有效的新型细磨介质的材质,并从钢球及铸铁段磨碎能力的对比工业试验研究中得出,铸铁段是一种实用性很高的新型细磨介质的材质。     

应用铸铁段在金川磨矿中的节能降耗研究

在铸铁段用于金川磨矿的实践中,发现钢球更换为铸铁段后磨矿细度均有不同程度的提高,说明铸铁段对提高磨矿细度有利,而且铸铁段要求的磨机充填率低。在钢球作为磨矿介质时,球磨机的电单耗在32.54kW·h/t,而铸铁段作为磨矿介质时,球磨机的电单耗为30.87kW·h/t,降低了1.67个百分点。在钢球更换为铸铁段后最显著的变化是球耗,随着磨矿时间的增加,铸铁段消耗呈现逐渐降低趋势。     

短柱在细磨中的应用研究

为了提高磨矿效率,改善磨矿产品粒度分布特性,用耐磨铸铁短柱作磨矿介质,替代了钢球磨矿,通过工业试验达到了磁铁矿磨至-0.043mm的目的,保证了高质量铁精矿生产.     

铸铁段在金川磨矿中的节能降耗研究

在铸铁段用于金川磨矿的实践中,发现钢球更换为铸铁段后磨矿细度均有不同程度的提高,说明铸铁段对提高磨矿细度有利,而且铸铁段要求的磨机充填率低。在钢球作为磨矿介质时,球磨机的电单耗在32.54kW·h/t,而铸铁段作为磨矿介质时,球磨机的电单耗为30.87kW·h/t,降低了1.67个百分点。在钢球更换为铸铁段后最显著的变化是球耗,随着磨矿时间的增加,铸铁段消耗呈现逐渐降低趋势。     

白云鄂博磁铁矿细磨磨矿介质选型试验研究

球磨中颗粒受磨矿介质高频次冲击-研磨而粉碎,合理选择介质类型能有效提升作业效率并改善磨矿产品指标。针对白云鄂博西矿选铁第三段磨矿作业能耗高、粒度偏粗的问题,系统研究了陶瓷球为磨矿介质细磨磁铁矿的效能,并与钢球及钢段做对比。首先以试验确定了介质尺寸、填充率及矿浆浓度等作业条件,之后以等介质量、等矿量磨矿试验对比研究3种介质磨矿的各项指标。结果表明:陶瓷球磨矿速度最快、能量利用效率最高,钢球次之,钢段最低,与介质数量正相关,可能由碰撞频次差异所致。在试验范围内,陶瓷球磨矿产品的细度最高、解离度最高,虽然产品中-19μm粒级含量较高,但磁选时选别效率仍然最高;钢段能有效改善过磨现象,同等细度下解离度最高,产品有较好的可选性,可能源自短棒形介质的线接触作用。仅从磨矿的技术指标考察,细磨磁铁矿时应优先考虑用陶瓷球;若只能选钢介质,则追求产率时应选用钢球,而为改善产品可选性时可选用钢段。     

梅山铁矿提高磨矿产品均匀性试验

由于梅山铁矿磨矿产品过粉碎现象严重,为了提高磨矿产品均匀性,选取梅山球磨4系列1段球磨给矿产品,在不同的磨矿时间、磨矿浓度、磨机转速率和钢球大小的条件下进行了磨矿效果试验。试验结果表明:合适的磨矿时间为3~4 min、磨矿浓度为70%~75%、磨机转速率为60%~76%。合理优化1段磨矿工艺参数后,与选厂2段分级溢流产品相比较,分选后铁精矿产率提高了4.93个百分点,全铁回收率提高了5.74个百分点,尾矿的产率降低了0.78个百分点,全铁损失产率降低了2.36个百分点,硫产率降低了6.25个百分点,尾矿产品-10μm粒级产率降低了16.24个百分点,中间粒级含量明显提高,不仅改善了磨矿产品均匀性,而且提高了后续分选指标。     

国外某选厂球磨机磨矿介质优化实践

为了提高球磨机的磨矿能力,降低磨矿能耗,实现提产保质的目标,某磁铁矿选矿厂分别使用 3 种不同规格的磨矿介质进行了提高球磨效率的探索试验。试验结果表明,在同等条件下,使用较小的φ25 mm 钢球介质比使用其他磨矿介质得到的磨矿产品粒度更细,精矿品位更高。利用离散元法 (DEM) 对 3 种钢球在球磨机中的运动轨迹进行模拟分析也表明,较小尺寸的钢球介质更加有利于提高磨矿效率,节省能耗。     

短柱在细磨中的应用研究

为了提高磨矿效率,改善磨矿产品粒度分布特性,用耐磨铸铁短柱作磨矿介质,替代了钢球磨矿,通过工业试验达到了磁铁矿磨至-0.043mm的目的,保证了高质量铁精矿生产。     

Studies on grinding media wear and its effect on flotation of ferrugenous phosphate ore

Marked ball grinding tests were carried out in the laboratory with a low grade phosphate ore under different experimental conditions. Two types of balls were used, namely high carbon low alloy (HCLA) cast steel and high chrome cast iron. Results of marked ball grinding tests indicated that ball wear increased with time and showed a sharp increase for wet grinding over dry grinding. Ball wear under wet grinding conditions was also influenced by the gaseous atmosphere in the mill. The grinding ball materials could be arranged in the following order with respect to their overall wear resistance:High chrome cast iron > HCLA cast steel ballsMethods to minimize ball wear through control of mill atmosphere and addition of flotation reagents are discussed. Effect of grinding media and additions of flotation reagents during grinding on phosphate ore flotation are also discussed.     

精确化装补球技术在黄金氰化细磨球磨机中的研究

Absrtact: Overflow ball mill is a common equipment in fine grinding of gold cyanide. There are problems of high energy consumption and ball consumption in fine grinding ball mill of Jinqiling gold mine cyanide plant in Shandong province. In order to solve this problem, the fine grinding ball mill is studied by precise ball filling technology. Firstly, the mechanical properties of the ore are tested by the rock mechanics experimental system, and the preliminary pellet scheme is calculated accurately by using the semi-theoretical formula of the diameter of the ball of Duan, and a precise supplementary pellet scheme is proposed on the basis of these. The results show that compared with the original steel ball system, the processing capacity of the mill is increased by 1,915 tons and 179 tons, and the grinding fineness is increased by 3.88% and 1.78%, respectively, by using steel ball and short cylindrical cast iron as grinding media. When cast iron is used as grinding medium, the grinding fineness index is better than that of steel ball, but the ball consumption is higher. Therefore, accurate ball filling technology can effectively reduce the energy consumption of overflow ball mill in large gold cyanide plant, and has a good promotion value.     

不同磨矿介质对金川铜镍矿浮选的影响研究

以金川硫化铜镍矿石为研究对象,通过浮选试验研究了不锈钢球、锆球、铸铁球三种介质磨矿时硫化铜镍矿石的浮选行为。结果表明,锆球磨矿可获得最高的回收率,铸铁球磨矿时脉石上浮量大。使用AFM、ICP等研究了磨矿产品表面形貌、电化学性质等的差异,结果表明,锆球磨矿时颗粒表面较为平整,矿浆电位较高,铸铁球磨矿时,颗粒表面较为粗糙,矿浆中检出较多铁离子,矿浆电位较低,这些差别导致了矿石浮选行为的差异。     

Wear performance and cost effectiveness––a criterion for the selection of grinding media for wet milling in mineral processing operations

Experiments to evaluate the milling performance, hence the relative cost effectiveness index of selected grinding media were conducted in a laboratory scale ball mill. The five types of grinding mill balls studied were eutectoid steel, low alloy steel, medium chromium cast iron, cast semi-steel and unalloyed white cast iron. The results obtained show that the heat-treated medium chromium cast iron ball possess a superior combination microstructure, wear resistance, and despite its high price per tonne, cost effectiveness.     

酒钢选烧厂新型磨矿介质工业试验研究

对酒钢选烧厂的磨矿介质进行了工业试验研究。结果表明, 低铬铸球单耗为0.316 kg/t, 高铬铸球单耗为0.214 kg/t, 热轧钢球单耗为0.185 kg/t。采用热轧钢球作球磨机介质, 碎球率极低, 钢球经过一个阶段使用后, 钢球硬度内外均匀, 性能稳定, 外形尺寸圆度好。     

Influence of galvanic interaction between chalcopyrite and some metallic materials on flotation

Galvanic interactions between the grinding media and the ground mineral inside a ball mill could not only accelerate the media wear but also adversely affect the flotation response of the ground mineral. Rest potential, combination potential and galvanic current measurements were carried out to understand the probable electrochemical interactions between chalcopyrite and several metallic electrodes such as platinum, stainless steel, hyper steel, mild steel and cast iron. Flotation recovery of chalcopyrite was found to be significantly lowered when contacted with hyper steel, mild steel or cast iron prior to flotation unlike with platinum or stainless steel. The influence of the presence of collector during galvanic interaction as well as the effect of relaxation for fresh and galvanically interacted chalcopyrite samples were also studied with respect to its floatability. AES and ESCA analyses indicated that galvanic coupling of chalcopyrite with a hyper steel grinding medium resulted in the formation of hydroxide or oxide species of iron on the mineral surface. An electrochemical mechanism is proposed to explain the mineral-grinding media interaction and its effect on flotation.     

钨合金白口铸铁衬板的研究和应用

球磨机是加工矿粉的重要设备，衬板是球磨机上的关键备件，其耐磨性直接影响磨机效率和粉料研磨成本，普通高锰钢衬板加工硬化效果差，耐磨性低，使用寿命短，更换频繁，我国钨资源丰富，以钨为主要合金元素，开发了钨合金白口铸铁衬板，钨合金白口铸铁脆性大，直接制造衬板易断裂，研究了碱金属元素K，Na对其组织和性能的影响，结果表明，钨合金白口铸铁经K，Na变质处理后，共晶碳化物由网状分布变成断网状，团球状分布，碳化物明显细化和分布均匀化，碳化物形态的改善导致钨合金白口铸铁的冲击韧性和抗冲击磨损性能明显提高，变质钨合金白口铸铁衬板应用于球磨机研磨矿粉，使用安全，可靠，寿命达到高锰钢衬板的3倍以上。