降低厂坝铅锌矿磨矿钢球消耗的技术措施

针对厂坝铅锌矿磨浮车间钢球消耗偏高的现状,通过对影响钢球消耗的因素进行科学分析,提出降低钢球消耗的措施,即通过采用新型中铬合金铸球替代原来使用的钢球、改进钢球补加制度、降低磨矿给矿超大粒级(+12mm)含量等措施,使钢球的单耗由1.03 kg/t降低到0.97 kg/t,每年可节约选矿成本68.64万元。对节能降耗,提高磨矿效率及企业经济效益具有重要的现实意义。     

矿石,钢球,球磨机衬三者硬度对磨矿效率的影响

西方详细阐述了根据矿石硬度正确选用不同硬度的钢球和球磨机衬板，可以获得最低的单耗和最好的球磨机单机自理量。对高硬度矿石如何选用钢球，衬板提出了几点看法。     

矿石、钢球、球磨机衬板三者硬度对磨矿效率的影响

本文详细阐述了根据矿石硬度正确选用不同硬度的钢球和球磨机衬板,可以获得最低的单耗和最好的球磨机单机处理量.对高硬度矿石如何选用钢球、衬板提出了几点看法.     

司家营铁矿磨矿钢球消耗的控制

针对司家营铁矿钢球消耗偏高的现状,通过对影响钢球消耗的因素进行科学分析,提出降低钢球消耗的措施。研究认为,磨矿钢球的消耗与矿石的可磨性、硬度、入磨粒度、矿物嵌布粒度、钢球材质补加方式、管理制度等密切相关。通过增加湿式预选作业、采用高铬合金铸球、改进钢球补加制度、降低磨矿给矿超大粒级(+12 mm)含量等措施,钢球年单耗由1.756 kg/t降低到1.077 kg/t,下降了0.679 kg/t原矿,对节能降耗、提高磨矿效率及企业经济效益具有重要的现实意义。     

磨球的湿式磨损分析及对策

通过对磨球的湿式磨损分析 ,认为添加抗腐蚀剂白灰及按 1 0 0∶ 80∶ 60 =30∶ 4 0∶ 30配比补加钢球 ,使钢球单耗由 1 .0 4 kg/ t降到 0 .90 kg/ t,同时提高磨矿细度和磨矿效率 ,达到降低生产成本的目的     

永平铜矿磨矿机降低钢球消耗的生产实践

介绍了水平铜矿选厂碎磨系统所使用的磨矿机其技术性能及设计工艺参数。由于在原设计设备、备件装配条件下,磨矿生产达不到浮选工艺的要求,而且钢球的消耗量大,因此对一些设计参数进行局部调整的基础上,又对魔矿机钢球的消耗进行了应用试验,选用了能适应矿石性质的钢球作磨矿机的磨矿介质,从而使磨矿机的钢球单耗由抽初期的２．０６ｋｇ／ｔ．矿下降到目前的１．２ｋｇ／ｔ．矿,这对节约生产成本是有利的。     

降低磨矿钢球消耗的研究与实践

本文分析了影响磨矿钢球消耗的原因 ,结合生产实践进行技术研究 ;制定出降低钢球消耗的对策 ,对降低选矿作业成本有借鉴意义。     

浅谈降低钢球消耗

介绍了钢球的应用状况，供应方式，影响钢球消耗的因素及降低钢球消耗的途径。     

φ5.03×6.4m磨机磨矿介质应用实践

永平铜矿选厂经过15年的生产实践,φ5.03 × 6.4m磨机磨矿介质随着生产的不断发展,钢球单耗由投产初期的2.06kg/t矿下降到目前的1.2kg/t矿.     

球磨机钢球磨损规律的探讨

叙述了生产用球磨机钢球磨损规律，影响其磨损的主要因素，现场试验方法，计算有关参数及今后生产实践降低钢球消耗的主要途径。     

球磨-浸出工艺处理三水铝石矿的工艺研究

采用自行研制的球磨装置对三水铝石矿进行了球磨溶出工艺研究。考察了填充系数、转速、料球比、配矿量和溶出温度等因素对球磨溶出性能的影响,并对球磨溶出矿浆进行了XRD分析。结果表明,三水铝石矿的最佳球磨工艺为:装球量30%、钢弹转速100 r/min、料球比1.2∶1、球磨钢球采用混合球(2~20 mm)1、00 mL母液配矿量25 g、溶出温度150℃。     

对球磨机衬板选材的一点看法

球磨机是选矿工业中的主要设备。为了保护球磨机筒体内表面不受磨损和控制钢球在简体内的运动轧迹，筒体内铺有高锰钢衬板。主要介绍球磨机衬板装在不同部位，应选不同材质的衬板。     

磁性衬板在Φ2.1m×4.5m球磨机上的应用

磁性衬板问世，是球磨机衬板史上的一次重大突破。应用试验表明能节约成本、节电、节球，提高球磨机作业率，同时减轻工人劳动强度，改善工作环境，提高企业经济效益。     

抛落冲击力及其对球磨机筒体结构损伤的分析

湿式球磨机运行时矿石和钢球沿筒体内壁上升,到一定高度而抛落下来,对筒体产生冲击。但在筒体结构强度设计计算中此项冲击力是忽略不计的。根据理论分析和实际观察结果对此项抛落冲击力及其对筒体结构的损伤进行了初步探讨。并认为,必须考虑抛落冲击力对筒体结构强度的影响。最后,提出了防止抛落冲击力对筒体结构损伤的实际措施。     

Sintered porous balls from rice husk for thermal insulation in iron and steel industries

Sintered porous balls were prepared from waste rice husk (RH) for thermal insulation purposes on the top of the ladles and tundishes in iron and steel industries. As the permanent insulating structure is not possible, temporary insulation is done by using agricultural wastes for economy that burn out and produce porous ash-based insulating layer. But the layer formed is non-uniform in thickness, causing non-uniform cooling pattern of the stored steel and variation in properties. Also burning of the wastes causes various occupational health hazards. Reduction in health risk with uniform insulating layer thickness could be achieved by using the temporary insulation as a sintered porous ball. Such a developmental work is described here using RH as the starting material. Ash generated is mesoporous in characteristic giving insulating properties; sintered form does not allow any fly off thus controls pollution and health hazards; and the ball shapes will result in uniform spreading with a uniform thickness of insulation.     

溢流型球磨机产能优化改造及应用

鑫达矿业公司产能突破3 000 t/d,磨矿细度不足,磨矿效率低下。球磨机的钢球尺寸和配比对提高磨矿效率至关重要。根据原矿矿石性质选择钢球材质,对磨矿分级产品的粒级组成进行考察分析,计算得出补加钢球最佳球径和级配为:一段磨矿m(90)∶m(70)=2∶1,二段磨矿m(50)∶m(40)=3∶2。改造前后磨矿产品粒级和球磨机耗电量的对比结果表明,改造后的球径和级配提高了球磨机的磨矿效率,降低了球耗和电耗。     

GCr15轴承钢碳化物控制及其对压碎负荷的影响

碳化物均匀性是影响轴承疲劳性能主要因素之一,对钢厂采用不同工艺生产的GCr15钢制成的钢球进行压碎试验,并对压碎后的钢球进行碳化物网状、带状分析。试验结果表明,延长高温扩散时间后,压碎负荷值提升;在此基础上进行控轧控冷,压碎负荷值进一步提升,并且提升幅度更显著。碳化物颗粒处于2.5～6μm,碳化物颗粒越大,压碎负荷值越小;坯料高温扩散温度1220～1240℃、时间16 h,且盘条终轧温度750～800℃、冷却速度4～5℃/s工艺生产的原材料制成钢球后的压碎负荷均值最高,达到了251.581kN。     

Modeling and Analysis of High-Energy Ball Milling Through Attritors

The effects of major processing parameters of attritor mills on ball milling efficiency (i.e., minimum energy consumption with maximum milling progress) are investigated using discrete element modeling (DEM). The major processing parameters investigated include the size of balls, ball volume fraction inside the canister, ball milling velocity, and design of the impeller shaft of the attritor mill. Their effects are studied through examination of the output parameters including the average speed of balls, maximum speed of balls, and torque applied on the impeller shaft. The torque on the impeller shaft represents the energy consumption during ball milling, while the difference between the maximum and average speeds of balls scales with the compressive pressure during “mini-forging” of powder particles trapped between the colliding balls and thus scales with milling progress (particle deformation and size reduction). The simulation reveals that the ball milling velocity, ball volume fraction inside the canister, ball size, and impeller shaft design are all important parameters for energy-efficient ball milling. In particular, high ball milling velocities can lead to larger particle deformation and faster size reduction with minimum energy consumption. Further, ball sizes smaller than the gap that will not be hit by impellers directly are good for high-energy-efficient ball milling. Otherwise, energy consumption increases substantially.

     

钢锻作细磨介质下的磨矿能耗与粒度分布特征

钢锻是一种线接触为主的磨矿介质.以1.18~2 mm、0.6~1.18 mm、0.3~0.6 mm 3个粒级样以及实际生产二段沉砂样为研究对象,分别采用等质量的钢球和钢锻进行分批次磨矿试验,分析了其磨矿产品的粒度分布和磨矿能耗分布.结果表明,钢锻作为细磨介质,与钢球相比,磨矿产品有着相同的粒度分布规律,符合JK粒度破碎模型.但在相同磨矿条件下,钢锻磨矿时生产能力比不上钢球.但随着给料粒度的变细,钢锻的磨矿效果开始显现,其磨矿产品中P80值与钢球的差异相差为0.22 %,而t10值与钢球的差异相差为2.23 %.与此同时,磨矿产品中 < 0.010 mm的含量明显低于钢球,过粉碎轻.当采用 < 0.425 mm实际钨矿石作为入磨样品验证时,有着上述相同的结论,从理论上说明了钢锻虽然磨矿能力逊色于钢球,但钢锻产生的合格粒级含量高于钢球,过粉碎情况轻于钢球,对于脆性矿物的细磨是一种优良的磨矿介质选择.      

Mechanical properties of fine grained hardmetals produced by pressureless and pressure assisted sintering technologies

Pressureless sintering and the two pressure assisted sintering technologies – sintering + hot isostatic pressing (sinter-HIP) and field assisted sintering technology (FAST) were used to produce a fine grained WC-6 Co hardmetal.

In order to compare the mechanical properties of the hardmetals, which result from different sintering technologies, the material strength was determined. In the present study the uniaxial three point bending test and the biaxial ball on three balls test were used as strength measuring methods. The results were described by the Weibull distribution function.

Additionally, the paper will analytically compare the two tests by describing the relation of the strength of the samples to their effective volumes. Based on this procedure components having arbitrary shapes and volumes can be designed.