钨渣合金铸铁的应用研究

通过用钨渣合金铸铁生产磨机的衬板、齿板、锤头，渣浆泵叶轮、等耐磨件的生产试验表明，该材质比传统的高锰钢效果好，耐麻约提高１．５－２．０倍，成本低３０％，且工艺简单。     

模拟酸雨条件下生物炭配施沸石对江西某钨矿区Pb、Cd、W的淋溶效应

为解决江西某钨矿区钨及其他重金属污染问题,通过室内模拟酸雨淋溶试验,研究在不同pH （3.1,4.5,5.8）酸雨条件下,添加稻壳生物炭（BC）、天然沸石（ZE）、稻壳生物炭—天然沸石（CO）改良剂对土壤Pb、Cd、W的固定效果。结果表明,酸雨增加了重金属的溶出风险,pH越低,风险越大。添加BC、ZE、CO有效提高土壤的酸缓冲能力,平均分别使得淋溶液pH增加0.53,0.23,0.58个单位,使得淋溶后土壤pH增加0.27,0.09,0.17个单位。在pH=4.5和pH=5.8模拟酸雨后,生物炭联合沸石处理Cd和Pb的淋溶总量明显低于未处理土壤,相较于空白分别降低32.1%,38.0%和36.0%,32.7%。W和Cd、Pb不同,在模拟酸雨pH=3.1条件下,添加改良剂对W淋溶总量均无显著影响,在模拟酸雨pH=4.5和pH=5.8时,单独施用生物炭处理使得W淋溶总量分别增加44.3,53.8 μg/L,但生物炭联合沸石处理使得W淋溶总量分别降低6.0,7.1 μg/L。综合来看,生物炭—沸石能更有效同时防止酸雨条件下污染土壤Pb、Cd、W的淋溶流失,可为后期钨矿区重金属污染防治提供参考。     

基于卤钨灯光源和多路光纤的土壤全氮含量检测仪研究

为了克服LED作为主动光源的土壤全氮含量检测仪波段单一、光强信号较弱、仪器信噪比难以提高的不足,基于卤钨灯光源和特制多路光纤设计了一款便携式土壤全氮含量检测仪。检测仪选用1108、1248、1336、1450、1537、1696nm作为土壤全氮敏感波长,选用高功率卤钨灯作为光源以提高信号强度,采用“一分六”特制光纤实现1路入射光通道和6路反射光通道。性能试验表明,调理电路和卤钨灯光源工作稳定,并且卤钨灯作为主动光源测量精度更高,“一分六”石英光纤测量精度高于其他类型光纤。根据检测仪吸光度和土壤全氮含量标准值建立了不同预测模型,结果表明,采用PLS建模精度最高,建模R2C为0.8613,验证R2V为0.8042,可以用于检测仪模型嵌入。田间试验结果表明,检测仪测量值和标准值的相关系数达到0.8280。设计的检测仪测量精度较高,可以满足田间快速准确检测的目的。     

Role of soil organic matter in a desert soil on plant response to silver,tungsten, cobalt,and lead

Abstract

Barley plants grown in a soil very low in organic matter had higher concentrations of Mn, Cu, Zn, and Mo than when the plants were grown in soil considerably higher in soil organic matter. Application of some heavy metals (Co, W, Ag) resulted in much more severe phytotoxicity on low organic matter soil than on high organic matter soil. FeDTPA (ferric diethylene triamine pentaacetate acid) increased Fe levels in plants much more on low organic matter soil than on high organic matter soil. Low organic matter soil resulted in a lower Cs level from the applied Cs than from the high organic matter soil. Sulfur increased Mn concentration of plants even though all the soil was not neutralized.     

High-temperature wear of cemented tungsten carbide tools while machining particleboard and fiberboard

Published research on the wear processes of cemented tungsten carbide tools used for machining reconstituted wood products was reviewed, and the current state of knowledge in this area was evaluated. Underlying assumptions and conclusions regarding high-temperature oxidation/corrosion wear during machining were examined in view of known reaction kinetics of cemented tungsten carbide alloys in oxidative and corrosive environments at temperatures that may occur at the cutting edge. This examination indicated that some wear mechanisms other than high-temperature oxidation/corrosion are likely to be rate-controlling when machining reconstituted wood products such as particleboard and fiberboard.     

硬质合金丝锥在铸铁高速攻丝中的切削力分析

发动机汽缸生产线上需求大量的高速加工用硬质合金丝锥.攻丝过程中,由于切削力的大小直接影响了加工精度及丝锥寿命,丝锥的参数优化也与切削力变化紧密相关,因此切削力分析在新型硬质合金丝锥的研制过程中显得尤为重要.通过立式加工中心和Kistler测力系统,对一批新型丝锥进行了切削性能评价,比较了不同的硬质合金丝锥加工灰铸铁和球墨铸铁过程中的切削力在旋入和旋出两个阶段的变化情况.指出了在铸铁攻丝中切削力的变化几乎不受丝锥磨损的影响,而与刀具夹持方式紧密相关.此外,攻丝力还与螺旋角、丝锥槽数以及试件材料的塑性均有不同程度的联系.     

SiC-WC复相陶瓷的力学性能与显微结构

在α-SiC和β-SiC超细粉末中,以Al、B、C为烧结助剂,分别添加0～24vol%WC,研究了SiC—WC复相陶瓷的力学性能和显微结构,获得了一种室温弯曲强度和断裂韧性分别达700MPa和8.6MPa·m(1/2)的SiC-WC复相陶瓷.     

变质处理改善钨渣低铬耐磨铸铁的组织和性能

In this paper, the effeefs of modification on the microstructure,mechanical properties and abrasion resistance of low chromium wearresistant cast iron meltedwith tungsten slag are investigated. The results obtained show that the morphology ofcarbides in t     

改善钨渣合金磨球材质的新工艺

采用复合变质的方法结合相应热处理,开发出价廉、生产工艺简单的钨渣合金磨球应用表明,成本比高铬磨球降低10%左右,耐磨性能提高10%～20%.     

大余县矿区的尾砂流失及治理

开采钨矿获得了巨大的经济效益和社会效益、但是开采与精选钨砂产生的尾砂流失会严重淤积河床;废水会污染环境,大余县没有及时治理对生态环境——农业生态环境造成了极大的危害。造成危害后再去治理要付出巨大的代价。希望吸取大余县的教训,提出在今后开发矿业等工程时要严格按照水土保持法规的要求,加强《水土保持方案》的审批与监督,切实把好主体工程与水土保持防护工程的“三同时”关,防止先破坏后治理,为子秤后代造福。