GJM型棒式搅拌磨机工业试验研究

在介绍石墨资源储量分布和鳞片石墨选矿流程的基础上,描述了GJM型棒式搅拌磨机的主要结构和工作原理,详细叙述了磨机的空载试验、条件探索试验和连续带矿试验。试验过程中,考察了磨机给料、排料粒度,测定了精选3浮选精矿和精选4浮选精矿品位。条件探索试验结果表明,磨机电机最佳运行频率为40 Hz、充填率为30%;连续带矿试验结果表明,相同工况下,经GJM型棒式搅拌磨机再磨后,浮选品位提升幅度比原有设备高40%以上,研磨介质消耗仅为原来的50%,设备节能25%以上。除此之外,设备整体运行平稳,可实现24 h以上带矿带介质满负荷启动,达到设计要求。总之,对于鳞片石墨再磨而言,GJM型棒式搅拌磨机是一款更为理想的设备。     

GJM型搅拌磨机在非金属矿细磨中的应用

在介绍GJM型搅拌磨机结构、工作原理、相关特性以及类型、工艺的基础上,结合国内相关非金属矿细磨的特殊要求,着重叙述了GJM型搅拌磨机在非金属矿(高岭土、石墨和云母等)细磨中的应用情况,并指明了今后的发展趋势。     

GJM型石墨用搅拌磨机的研制与应用

介绍了GJM型搅拌磨机基本结构和工作原理,分析了设计中的主要因素,如搅拌装置、槽体结构和耐磨材料等;针对大鳞片石墨的特性开发了GJM型石墨专用搅拌磨机,着重介绍其在国内外石墨选厂的工业应用情况。结果表明,GJM型石墨用搅拌磨机可显著提高石墨产品的质量等级,为生产企业创造了巨大经济效益。     

典型石墨再磨设备的应用进展

着重叙述了球磨机和搅拌磨机等应用较为广泛的石墨再磨设备,对搅拌磨机的基本结构和种类做了较详细的介绍,并对石墨再磨设备的选型方法和原则进行了分析。     

GJM型棒式搅拌磨机的研发与应用

为解决普通球磨机在石墨再磨流程中存在的效率低、能耗高的问题,在阐述石墨再磨设备设计要求的基础上,研制了GJM型棒式搅拌磨机。研发过程中,以相似放大为基本设计原则,明确了高径比在1∶1~2.5∶1之间的圆柱形筒体结构;确定了搅拌棒在搅拌主轴上呈2~10层、每层1~8根的螺旋上升式布置型式,采用了电机、减速机直接传动方式。同时,运用力学知识分析了磨机内部的受力情况和运动形态,通过轴功率的计算确定了磨机装机功率;分析了特定能量输入下应力强度对产品粒度的影响方式,得到了应力强度在(0.1~0.5)×10-4 N·m时容易获得最优产品粒度的结论。最终,将此磨机和普通球磨机同时应用于石墨再磨流程中,取得了较普通球磨机节能25%左右的试验结果,表明其在石墨行业的应用潜力巨大。     

我国石墨选矿技术及装备进展*

为了使我国石墨矿选矿工作者全面、系统了解我国石墨矿石选矿工艺技术与设备的进展情况，从碎矿工艺、磨矿工艺技术、选矿工艺、浮选捕收剂、起泡剂、调整剂的应用，以及石墨矿专用浮选机、专用浮选柱、专用GJM型立式搅拌磨机、FGY型高频振动筛和间歇式湿法滚筒筛、高方筛的研制与应用情况分别进行了介绍，对推动石墨选矿工艺技术与设备的进步具有重要意义。     

石墨高效再磨擦洗技术及工业试验研究

石墨选别的主要目标是在获得高品位精矿的同时保护其大鳞片结构,降低大鳞片石墨损失率,石墨的片层结构特点要求再磨擦洗以剪切摩擦作用为主,减少轴向交错运动并避免冲击。基于离散单元法进行计算机仿真,分析比较了不同结构形式搅拌装置作用下介质运动特性,探明棒式搅拌结构作用下介质周向运动强,轴向运动弱,主轴转速是影响介质运动速度的主要因素,有效作用范围主要集中于搅拌棒临近区域,提出"大直径、小层距、临层错角"的设计方案,解决了有效作用范围相对较小的问题。工业中棒式搅拌磨机与现场原有设备前后对比,再磨前后精矿品位提升值提高1%~4%,+150μm大片石墨损失率降低3%~5%,是一种更优的石墨再磨擦洗设备。     

立式搅拌磨机磨矿机理研究进展

立式搅拌磨机是一种高效率、低能耗的细磨和超细磨磨矿设备,相对于卧式球磨机,立式搅拌磨机在节省能量消耗方面具有显著的优越性,被广泛应用于矿山领域的精矿再磨和第二、第三段磨矿作业。为了促进立式搅拌磨机的优化与开发,本文介绍了立式搅拌磨机的运行工作原理,系统总结了立式搅拌磨机研磨理论和磨矿介质运动状态研究成果,综述了搅拌器转速、介质填充率、磨矿介质属性、搅拌器属性等工作参数与结构参数对立式搅拌磨机磨矿过程和研磨效果的影响,分析了立式搅拌磨机关键技术参数的选择条件,为立式搅拌磨机的机理研究与发展提供参考。     

KWM卧式搅拌磨机的研制及试验

在介绍卧式搅拌磨机发展现状的基础上,详细叙述了KWM高效卧式搅拌磨机的结构和工作原理,并进行了电气石和铅锌矿的试验研究。试验结果表明:KWM高效卧式搅拌磨机可将矿石细磨至10μm以下,能量输入密度可达普通再磨球磨机的30~40倍;同时该设备还具有占地面积小、安装方便、维护简单等优点,在金属矿和非金属矿的再磨及超细磨加工中具有广阔的应用前景。     

石墨再磨介质球对比试验研究

以立式搅拌磨机作为再磨设备,分别使用钢球、微晶球、褐瓷球、鹅卵石作为介质球对石墨粗精矿进行再磨对比试验研究。在相同的磨矿细度和浮选条件下,对获得的精矿进行浮选效果、粒度组成分析、电镜微观分析等综合对比,结果表明,采用褐瓷球作为再磨介质时,磨矿-浮选指标较好,精矿细粒级含量较低,鳞片表面光滑、结构较为规则完整。     

某大鳞片石墨实验室选矿试验及中试验证

某天然鳞片石墨矿固定碳含量高,鳞片粒度大。为保护石墨大鳞片,进行了不同搅拌磨转速和再磨介质的开路试验,确定了选矿工艺流程和关键参数,最佳工艺参数下石墨精矿固定碳含量96.61%、固定碳回收率85.72%、精矿中+0.15 mm粒级产率62.76%。应用连续型XCF/KYF浮选机、GMJ立式搅拌磨,在1 t/d的中试线实现了选矿工艺的放大,并带矿连续运行,优化后中试试验的指标为：精矿固定碳含量96.84%、固定碳回收率80.53%、精矿中+0.15 mm粒级产率59.78%。研究为同类型大鳞片石墨选矿厂的工程化实施提供了借鉴和指导,有助于大鳞片石墨矿的系统性、科学化开发。     

搅拌磨在铁矿细磨中的应用研究

通过研究大孤山铁矿再磨给矿的物料性质,考察了搅拌磨的主要工作参数对搅拌磨粉磨效果的影响。通过磨矿条件试验确定搅拌磨适宜的工作参数:介质为8mm钢球,料球比0.8,介质充填率75%,搅拌器转速300rpm,磨矿浓度68.50%。适宜磨矿条件下的磨矿产品经选别后可获得精矿TFe品位65.54%,回收率97.20%的铁精矿。     

The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation

Stirred mills have been widely used for regrinding, and are acknowledged to be more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms during grinding. In this study, the effect of regrinding by both mills on surface properties and subsequent mineral flotation was studied, using chalcocite as the mineral example. A rod mill and a stirred mill with the same stainless steel media were used to regrind rougher flotation concentrates. Different chalcocite flotation recovery was achieved in the cleaner stage after regrinding in tumbling and stirred mills. The factors contributing to the different recovery included particle size, the amount of created fresh surfaces, surface oxidation and the redistribution of collector carried from rougher flotation. All the factors were examined. It was determined that the predominating factor was the different distribution of collector resulting from different particle breakage mechanisms in the stirred and tumbling mills, in line with ToF-SIMS analysis. In the tumbling mill, the impact particle breakage mechanism predominates, causing the collector to remain on the surface of newly produced particles. In the stirred mill, the attrition breakage removes collector from the surface, and decreases particle floatability. Furthermore, the type of grinding media in the stirred mill also influences the subsequent flotation, again due to the change of particle breakage mechanisms. The results of this study demonstrate that the selection of regrinding mills and grinding media should not only depend on the required energy efficiency, but also on the properties of the surfaces produced for subsequent flotation.     

立式螺旋磨矿技术在选矿中的发展与应用

立式螺旋磨矿机(塔磨机)开始越来越多地应用于各类矿山选矿厂的细磨及再磨工艺中,其高效、节能、环保、操作简单、易于维护等特点使其具有广阔的应用前景。本文阐述了立式螺旋磨矿机的结构特点与工作原理,对该技术的产生、发展及与同类技术设备的比较进行综合评述,并通过简要介绍该技术及设备在国内外的应用,指出立式螺旋磨矿技术的应用在选矿工业的发展中将带来显著的经济和社会效益。     

The effect of regrind mills on the separation of chalcopyrite from pyrite in cleaner flotation

Stirred mills have been widely used for regrinding and are more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms and redox environments during grinding. In this study, the effect of regrinding with these two types of mills on the separation of chalcopyrite from pyrite in the cleaner stage was studied. A laboratory rod mill and a laboratory stirred mill were used to regrind rougher flotation concentrates. It was found that chalcopyrite and pyrite exhibited different flotation behavior after regrinding with the rod mill and the stirred mill, resulting in different separability of chalcopyrite from pyrite. The mechanism underpinning this phenomenon was investigated by a range of techniques including dissolved oxygen demand measurements, X-ray photoelectron spectroscopy (XPS) and Time of flight secondary ion mass spectrometry (ToF-SIMS). It was found that the two mills produced different surface oxidation and pyrite activation by copper ions which determined the separation of chalcopyrite from pyrite. This study demonstrates that the selection of a regrind mill should not only depend on its energy efficiency but also the property of surfaces produced for subsequent flotation.