TG-4036A型废钢压块机衬板国产化研制

本钢废钢厂从美国进口的TG-4036A型废钢压块机经多年运行，衬板磨损严重，急需进行国产化改造。辽宁科技学院承担了衬板、衬板螺钉的测绘和设计任务，并负责指导新衬板及衬板螺钉的制造与检验，节省了大量的资金和外汇，实现了TG-4036A型废钢压块机衬板及衬板螺钉的国产化。     

磁性衬板的试制与应用

从磁性衬板的构造和工作原理出发，详细地介绍了生产磁性衬板的全过程，实践证明，磁性衬板是一种生产成本低、耐磨性好、生产率高的衬板。     

磁性衬板在黄金选矿厂的应用

磁性衬板在黄金选矿厂的应用刘志亮（张家口金矿）１引言磁性衬板是一种新型材料，安装在磨机筒体内壁上，借助磁力在衬板工作面吸附一层磁性物质，形成保护层，减少衬板工作面与运动介质和物料的直接接触，从而减轻磨损、延长衬板使用寿命。目前有橡胶磁性衬板和金属磁性...     

鞍钢齐大山选矿厂衬板的质量分析及改进方案

鞍钢齐大山选矿厂衬板的质量分析及改进方案曹天顺（鞍钢职工工学院）１衬板使用情况的调查衬板主要有球磨衬板、磁选的托磁器等，种类有三角铁衬板、算铁衬板及长铁衬板等三类。选矿是鞍钢生产的主要环节，对衬板的需求量很大。衬板的质量问题主要是使用寿命短，消耗量大...     

有效降低磨机衬板消耗途径的探讨

分析磨机衬板磨损的机理 ,从合理的粉磨工艺设计、磨机衬板的功能和结构设计 ,到磨机衬板材质的选择等方面 ,探讨了有效降低衬板消耗的途径 .     

新型复合衬板在炼铁系统中的应用

目前冶金等领域各类衬板在结构上存在的单一性能缺陷,使得衬板使用寿命短、造成维修费用高、检修工作量大、工作环境差等缺陷。使用新型复合型衬板目的在于克服现有技术的不足,提供同时具备料磨料性能和综合机械性能的复合结构新型长寿性衬板及便于更换衬板的积料箱。从受料原料品种特性,该衬板同时具有抗冲击、抗腐蚀、抗磨损性能。     

浅谈球磨机磁性衬板的研究及应用

磁性衬板是一种新型的球磨机衬板,应用于含磁性矿的矿石磨矿时,由于在衬板工作面能吸附一层磁性物质,可形成保护膜,减少衬板工作面与运动的介质和物料直接接触,从而可达到延长衬板寿命的目的。本文主要就磁性衬板的研究概况、特性及应用情况进行了阐述。     

磨机衬板的磨损和衬板用钢的发展

磨机是金属矿和非金属矿的重要制粉设备。磨机衬板的磨损是非常复杂的过程,影响因素很多,大致可分为衬板材料的内部因素和外部因素。材料的内部因素有材料的冶金质量、化学成分和显微组织等。外部因素包括被磨物料的硬度和韧性、磨料的粒度和锐度、物料和磨矿介质对衬板的撞击速度。磨机直径大小和转动速度,以及衬板的结构形式等。相同材料的衬板在同一磨机内不同部位,它们的磨损也是不同的。例如,磨机筒部衬板的磨损常常比端部衬板的磨损要严重些。     

磁性衬板在梅山选矿厂的试用及分析

总结了磁性衬板在梅山选矿厂的试验情况,对试验中的问题进行了分析和改进。并对磁性衬板与高锰钢衬板性能、特点和使用效果进行了比较,最后对磁性衬板在梅山选矿厂的应用前景进行了探讨。     

散装矿物转接设备耐磨衬板选型研究

为解决港口耐磨衬板在使用过程中性能无法满足工况需求的问题,开展了影响耐磨衬板使用寿命的专项研究,通过磨粒磨损试验、冲蚀磨损试验、抗冲击试验和黏矿性试验,阐明不同种类耐磨衬板在实际应用中的性能差异,从从而指导耐磨衬板种类的合理选型,力争达到耐磨衬板的经济使用价值最大化。     

Comparison of Solute Transport in Three Composite Liners

Three composite landfill liners were compared in this study based on leakage rate, mass flux, and sorptive capacity. One composite liner consisted of a geomembrane and a geosynthetic clay liner (GCL). The other two had a geomembrane and a thicker soil barrier (61 or 122 cm). The analyses employed one- and three-dimensional numerical models that were developed for analyzing contaminant transport through defects in the geomembrane component of composite liners and diffusion of volatile organic compounds through intact composite liners (i.e., composite liners without holes in the geomembrane). Cadmium was used to represent inorganic leachate constituents and toluene was used to represent organic leachate constituents. The composite liner, having a GCL had the lowest leakage rate of the three composite liners. For cadmium, the mass flow rate and sorptive capacity for the three composite liners varied within an order of magnitude. However, for toluene, the mass flux from the GCL composite liner was two to three orders of magnitude greater than that through composite liners having a thicker soil liner. Additionally, for leachate having similar concentrations of cadmium and toluene, the mass flux of toluene can be as much as seven orders of magnitude greater than that for cadmium. For toluene, the sorptive capacity of thicker liners was an order of magnitude greater than that for the GCL composite liner. Similar behavior is expected for other inorganic and organic solutes.     

磁性耐磨衬里在磨矿行业的研究和应用进展

在分析磨机内研磨介质运动形态和磁性耐磨衬里磨损机理的基础上,利用COMSOL Multiphysics软件对磁性耐磨衬里的磁场特性进行了优化。优化后磁性耐磨衬里在磁铁矿、非磁铁矿中的球磨机、立磨机中均取得了成功应用,且其较普通高锰钢衬里具有使用寿命长、磨机作业率高、节球、节电等显著优点。     

Evaluating the Long-Term Performance of Geosynthetic Clay Liners Exposed to Freeze-Thaw

An important consideration for landfill liners and covers constructed in the frost zone of cold climates is the possible deterioration in performance due to freeze-thaw cycling over the design life of the liner or cover system. Several examples in the literature show that geosynthetic clay liners can withstand a limited number of freeze-thaw events, but data on long-term freeze-thaw performance are lacking. The objective of this study was to examine the long-term performance of geosynthetic clay liners exposed to repeated freeze-thaw cycles, encompassing their application as a final cover as well as a bottom liner. Measurements of hydraulic conductivity were performed after as many as 150 freeze-thaw cycles, with no appreciable increases observed.     

Comparison of tensile and peel bond strengths of resilient liners

Previous studies have shown little agreement between the test methods used to assess the bond strength and the mode of failure of resilient liners. This study evaluated the bond strength characteristics of resilient liners by means of 180-degree peeling and butt tensile strength testing. Seventy-two specimens were divided into peel bond and tensile bond specimen groups and were then subdivided into four test groups to evaluate each resilient liner. Tests were conducted with an Instron universal testing machine at a cross-head speed of 2 mm/minute for the tensile specimens and 5 mm/min for the peel specimens. Tensile bond strength and peel bond strength varied significantly among resilient liners except between Novus and Palasiv-62 liners in tensile testing. The mode of failure of Molloplast-B and Novus liners was significantly different between the tensile bond and peel bond test methods. It was concluded that bond strength characteristics can vary according to the test method used.     

Bond strength of six soft denture liners processed against polymerized and unpolymerized poly(methyl methacrylate)

The bond strength of six commercial soft denture liners was evaluated by a two-phase tensile test. The soft denture liners investigated were VinaSoft, Prolastic, Flexor, Molloplast-B, Novus, and SuperSoft. The samples were fabricated by processing them (1) against polymerized poly(methyl methacrylate), and (2) against unpolymerized poly(methyl methacrylate). The soft denture liners were processed according to the manufacturers recommendations. The samples were tested using an Instron Universal Testing Machine. The mode of failure, adhesive or cohesive, was also recorded. The bond strength when processed against unpolymerized poly(methyl methacrylate) ranged from 0.48 to 2.60 MPa, and when processed against polymerized poly(methyl methacrylate) the bond strength ranged from 0.94 to 2.56 MPa. A two-way analysis of variance (P = .05) revealed a significant increase in bond strength when the liners were processed against polymerized poly(methyl methacrylate), except for Novus, which had no change, and VinaSoft, which decreased. The Tukey interval between materials was .22 and between methods of polymerization was .08. Four of the six liners investigated demonstrated increased bond strength when processed against polymerized poly(methyl methacrylate). It was concluded that bonding can be influenced by the processing method.     

Performance of North American Bioreactor Landfills. I: Leachate Hydrology and Waste Settlement

An assessment of state-of-the-practice at five full-scale North American landfills operating as bioreactors is presented in this two-paper set. This paper focuses on effectiveness of liners and leachate collection systems, leachate generation rates, leachate recirculation practices and rates, effectiveness in moistening the waste, and settlement of the waste over time. Except in one case, the liner and leachate collection systems at the bioreactor landfills were similar to those used for landfills operated conventionally. Leachate generation rates increased approximately linearly with recirculation rate, but in all cases, the leachate generation rate was <300?L/m2?year. Leachate depths generally were maintained within regulatory requirements, even with the highest recirculation rates. Leakage rates from liners at bioreactor landfills, including alternative liner designs employing geosynthetic clay liners, are comparable to leakage rates from conventional landfills. Thus, based on the information gathered in this study, additional requirements or features for liners or leachate collection systems are not warranted for bioreactor landfills. Diminishing capacity of horizontal recirculation trenches is common. Experience at one landfill suggests that small doses at high frequency under substantial injection pressure can deter loss of trench capacity. Only those landfills that were aggressive in recirculation had achieved water contents near the field capacity. Increasing the amount of liquid that is added may be required to achieve field capacity at some landfills, particularly if a final cover is placed soon after waste grades are reached. The rate of time-dependent waste settlement attributed to biodegradation is about 1.6 times larger in bioreactor landfills than in conventional landfills, and increases as the recirculation dosage increases.     

Bond strength of permanent soft denture liners bonded to the denture base

The purpose of this study was to characterize denture and soft liner adhesion and to determine the adhesive and/or cohesive strength of different soft tissue liners bonded to the denture base by use of a new technique. Two groups of five permanent soft liners (dry or exposed to water for 6 months) were tested by use of a tensile mode to characterize the failure characteristics of soft liners bonded to denture base resin. The method differed from previous test methods because of the specimen's ability to align axially during the test. The results indicated significant differences in the bonding of liners to the denture base, and light-cure systems exhibited the greatest amount of stress needed for failure. Low bond strength was observed when the adhesion was poor or when the cohesive strength of the soft liner was low and lead to pure adhesive or cohesive failure. When both adhesive and cohesive bonds were strong, failure occurred at high stresses. Combinations of adhesive and cohesive failures (mixed mode) were also observed in intermediate cases.     

Transit-Time Design for Diffusion through Composite Liners

Transit-time design methods are presented in this paper for determining the design thickness for composite liners consisting of a geomembrane and a compacted soil liner or geosynthetic clay liner. The design methods are based on a closed-form analytical solution for transient solute diffusion of volatile organic compounds in a composite liner and results from a numerical model. An analytical solution for diffusion in a two-layer soil profile, which is useful for transit-time design of composite liners, is also presented. The analytical solutions are used to develop graphical solution charts that can be used to design composite liners for which the effluent concentration and contaminant flux are less than a specified value. Design examples are included for a composite liner having a compacted soil liner and a composite liner having a geosynthetic clay liner. The method is relatively simple to apply and can be used for preliminary design of composite liners, evaluating experimental results, and verifying more complex numerical models.     

球磨机筒体衬板布局及连接方式的改造实践

球磨机是冶金矿山选矿厂普遍使用的关键设备。针对传统球磨机衬板布局及连接方式（丁字形交错布局）存在的更换费时、费力及漏浆等问题,技术改造采用了“一字形”平行布局及连接方式。改造后,缩短了衬板更换拆卸、安装时间,提高了球磨机运转率。     

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。