简述X射线荧光光谱法测定地质样品中氯的含量

对地质样品中氯的含量的测定主要是通过X射线荧光光谱粉末压片法。实验中采用国家标准物质分析验证法对不同地质样品中氯含量进行测定,建立校准曲线,通过对地质样品重复测定,总结其出现变化的规律和原因。本文主要是对X射线荧光光谱法测定地质样品中氯的含量实验进行了分析,总结结果并进行了讨论。     

X射线荧光光谱法测定粗铅中主要元素含量的研究

试验通过建立X射线荧光光谱分析粗铅类样品的工作曲线,采用X荧光光谱法测定某综合回收厂冶炼过程中所产粗铅中Pb、Bi、Sb、Cu、As的含量,与传统化学滴定分析所测得的含量对比分析得出,X射线荧光光谱分析粗铅主要元素Pb、Bi、Sb、Cu、As的含量具有准确性高,分析速度快,不破坏样品的特点。     

X射线荧光光谱法测定生石灰中钙、镁、硅、硫

介绍了用X射线荧光光谱仪测定生石灰中Ca ,Mg ,Si和S含量的方法。通过条件试验 ,确定了各元素的最佳测定条件 ,同时探讨了研磨样品时间对X射线荧光强度和分析曲线的影响、放置时间对样品含量的影响。实践证明 ,该方法快捷、简便、准确。RSD在 0 . 0 17%～ 0 .93 %之间     

X射线荧光光谱仪测定地质矿物中的金属元素研究

由于传统测量仪器在进行地质矿物中的金属元素测定工作,没有根据金属元素含量测量的工作曲线圈定异常数值范围,因此测定结果精准度低。针对这一问题,进行波长色散型的X射线荧光光谱仪测定地质矿物中的金属元素研究。通过对地质矿物样品进行检测,确定地质矿物中的背景值与异常下限。本文采用荷兰帕纳科公司制造Axios-mAX型波长色散型的X射线荧光光谱仪一次测定地质矿物样品中Cu、Pb、Zn、Sn、W元素含量,将电感耦合等离子体光谱仪(ICP-OES)与帕纳科波长色散型的X射线荧光光谱仪所测结果进行对比分析。实验结果表明,帕纳科波长色散型的X射线荧光光谱仪测定地质矿物样品中的金属元素含量更为准确,更加适合实际生产需要。     

粉末压片制样—X射线荧光光谱法测定钼铁中的钼

本文介绍了粉末压片制样-X射线荧光光谱法对钼铁中钼含量测定的检测方法。文中采用钼铁样品与微晶纤维素、硬脂酸按一定的质量比混匀并细磨后采用硼酸镶边-衬底技术进行样品制备。选用生产用普通系列样品绘制标准工作曲线,在X射线荧光光谱仪上测定钼的含量。测量结果与钼酸铅重量法分析结果相符。     

微波灼烧-X射线荧光光谱法测定还原铁中5种成分

介绍了微波快速灼烧技术在X射线荧光光谱法分析还原铁中5种成分的应用。实验表明:采用微波灼烧技术对还原铁样品进行预氧化,还原铁样品烧损值近－30%时,相对标准偏差小于0.15%; 采用X射线荧光光谱法对微波灼烧后的还原铁样品进行测定,当TFe、SiO₂、CaO、P₂O₅、Al₂O₃含量分别为89.96%、2.29%、0.11%、0.16%、0.78%时,其相对标准偏差分别为0.20%、4.1%、1.6%、1.4%、5.0%;还原铁样品的TFe含量在80％以上时,其测定结果的允许差在±0.5%以内,其它成分的X射线荧光光谱法分析结果与化学湿法分析结果也相符。     

X射线荧光光谱快速分析高碳铬铁中铬、硅、磷

介绍了采用X射线荧光光谱法对高碳铬铁中铬、硅、磷进行含量测定的方法并对其准确度和精密度进行了验证。通过对高碳铬铁合金样品进行压片制备,对X射线荧光仪各参数的调整,建立了高碳铬铁工作曲线,满足了钢铁企业对高碳铬铁快速准确的分析要求。     

X射线荧光光谱法测定镁砂中的主要元素

介绍了采用X射线荧光光谱法测定镁砂中的SiO2、CaO、MgO、Fe203、Al2O3等元素的方法。采用将灼烧后的样品与四硼酸锂混合在高温条件下熔融成片，用x射线荧光光谱仪测定，分析结果的精密度、准确度高，分析速度快，适合于大批量进厂原料的检验工作。     

X射线荧光光谱法在地质样品检测中的应用

利用高功率X射线荧光光谱仪,采用粉末压片制样的方法,检测地质样品中铜、钼、砷、锑、铋五种元素含量,提高了地质样品检测速度。     

石墨粉熔融法-X射线荧光分析硅铁合金的7种元素含量

采用石墨粉熔融法制备硅铁合金样品,通过X射线荧光分析检测硅铁合金中7种元素含量。该检测方法提高了硅铁合金分析的准确度,分析所用时间较短,扩大了元素的分析范围。     

温度对轧辊磨损测量结果的影响

现场实测了涟钢CSP热连轧厂Φ600 mm×2 000 mm材质为(%):3.50C-1.20Si-1.20Mn-2.10Cr-4.50Ni-0.80Mo高铬高镍铸铁CVC轧辊的磨损情况。结果表明,轧辊的磨损呈现典型的箱形,温度对轧辊磨损的影响较大,影响最大部分位于箱底中部,最大差值达85.1μm。因轧辊磨床的磨削精度≤10μm,因此轧辊在磨削前应冷却至10℃以下。     

Machining Characteristics of Ce-ZrO2/CePO4 Ceramics

Two-phase mixtures of Ce-ZrO2 and monazite-type CePO4 were fabricated. Drilling and grinding experiments were carried out to investigate the machining characteristics of Ce-ZrO2/CePO4 ceramics. The machined surfaces of ceramics and wear surfaces of drill bits were observed with scanning electron microscope. Material removals and grinding forces were measured. The transgranular fracture of CePO4 grains, intergranular fracture between ZrO2 and CePO4 grains, and ductile deformation of ceramics were observed on Ce-ZrO2/CePO4 machined surfaces. With the increase of CePO4 proportion to composites, drilling material removal rates increases and specific normal grinding forces decreases.There existed rapid wear of conventional metal cutting tool is caused by abrasive wear. The experimental results indicate that the weak interfaces and properties of Ce-ZrO2/CePO4 ceramics have influences on material removal and machinability.     

Application of copper nanoparticles as additions to a grinding fluid to increase the quality of grinding of magnetic ceramic materials

The influence of copper nanoparticles in a grinding fluid (GF) used for grinding on the characteristics of the surface layer of ferrite parts and their service properties is studied. Profilograms of the ground surfaces and their roughness are measured. The electromagnetic losses of 10000NN ferrite parts ground in an GF medium with copper nanoparticles are estimated. The use of metal nanoparticles as additions to a grinding fluid is shown to be useful for processing of brittle nonmetallic materials.     

在线磨辊辊面粗糙度的实验研究

影响轧辊表面粗糙度的因素很多，为此对影响辊面粗糙度的因素进行了系统分析和实验研究，得出了轧辊和砂轮的速度、砂轮粒度、砂轮直径及磨削液等主要因素对轧辊表面粗糙度影响的一般规律。利用回归分析的方法建立了轧辊表面粗糙度的数学模型，并将计算值与实测值进行了比较，发现两者基本一致。此项研究为适时控制冷轧带钢在线磨辊辊面粗糙度提供了计算模型。     

原料润磨对造球和焙烧过程的影响

通过生产试验,研究了原料润磨比对生球强度的影响,在实验室进行了不同温度的焙烧试验,测量了原料不同润磨比时球团矿的常温抗压强度,研究了球团矿氧化焙烧过程中热态强度的变化规律.     

酒钢二原料1#磨煤机本体检修方案优化

炼铁厂二原料1#磨煤机为ZGM113N中速辊盘式磨煤机,其碾磨部分是由转动的磨环和三个沿磨环滚动的固定且可自转的磨辊组成。年修周期一般为2年,年修工期在9 d左右,一般年修的主要任务量为磨环与磨辊更换。二原料磨煤机磨辊单重为10.5 t,而屋顶检修电葫芦的额定起重量为16 t,因此吊装工艺是否合理,将是整个磨煤机检修的关键。     

螺纹插装式溢流阀阀套内锥面制造的误差控制

螺纹插装式溢流阀阀套精加工采用碳氮共渗后磨削的制造工艺,内锥面的形位误差会影响溢流阀的使用寿命和静动态特性,制造过程需要精准控制内锥面的误差。通过对工艺分析建立制造误差模型并应用研究,由此获得内锥面自身角度的合理误差范围,以及内锥角误差与磨削量之间的变化关系。根据阀套结构特点设计专用的检测装置,并对检测原理和测量误差进行分析,通过误差校对提高检测精度。对热处理后的阀套进行轴向尺寸分组,并采用基准统一原则,保证磨削制造精度的稳定性。根据检测原理和误差模型对试磨件进行误差计算,并据此调整磨削参数,使制造误差合格;后续制造时采用检测装置快速测量阀套的密封圆轴向尺寸,使制造误差均落在控制范围内,保证批量生产的可控性。研究表明,基于某型溢流阀的设计及工艺参数,内锥面自身角度的实际制造误差控制以±0.8°为宜,对应的密封圆轴向最大磨削公差为0.186 mm、修正后的最小磨削公差为0.075 mm;实验验证了误差模型的准确性,所述检测方法的角度测量误差为0.06°、密封圆轴向尺寸测量误差为2 μm,因角度测量误差带来的最大、最小磨削量范围偏差可通过内锥角实际制造误差的收缩进行补偿;所研究的理论与方法也为其他内锥面的制造控制及逆向工程提供了系统的方法。      

Grain-Size Composition and Coercive Force of Nd2Fe14B Alloy Powder in a Finely Divided State

The change in grain-size composition and magnetic properties of powder prepared by grinding cast alloy Nd₂Fe₁₄B in a ball mill for different times is studied. It is shown that during grinding the coercive force of the powder increases uniformly at first reaching a maximum, and then it decreases. It is established that this phenomenon is not due to powder oxidation during grinding but a reduction in the level of particle uniaxial anisotropy caused by deformation of their surface layer during grinding. The change in coercive force of Nd ₂Fe₁₄B alloy powder on grinding obeys the same features that are observed with mechanical grinding of other uniaxial magnetic materials.     

半自磨机顽石作为实验室立磨机介质的磨损与磨矿研究

随着半自磨流程在国内大型矿山的日益普及, 对如何处理半自磨机磨矿过程中产生的顽石, 各选厂采用的方式不尽相同.利用半自磨机顽石充当立磨机磨矿介质处理这类顽石并对此开展顽石的磨矿条件试验研究, 包括:磨矿时间、充填率、磨矿浓度和磨矿处理量等条件试验, 以及顽石、钢球磨矿介质对比试验.试验结果表明:半自磨机顽石可以作为磨矿介质在立磨机内使用, 其损耗量相比较于传统钢球的损耗量 (大约0.05 %) 是较大的, 一般在1 %~2 %之间.在磨矿时间3 min、填充率60 %、磨矿浓度65 %、磨矿量5 kg时可获得满足浮选要求的磨矿产品.在磨矿时间3 min、立磨机转速210 r/min、磨矿浓度65 %、磨矿量5 kg、磨矿介质直径10~20 mm、充填率60 %的条件下进行顽石和钢球磨矿介质的磨矿对比试验, 结果表明, 钢球磨矿产品的细度比顽石磨矿高16.72 %, 过粉碎粒级产率高2.35 %, 钢球的磨矿效率大于顽石, 但顽石磨矿产品中0.045~0.038 mm的产率高于钢球磨矿, 说明顽石充当磨矿介质时易使被磨矿物磨细到嵌布粒度的大小, 会使产品粒度分布更合理.      

Effect of Rheology of Grinding Efficiency in the Laboratory Scale Continuous Classifying Mill

Abstract

Different ores containing soft minerals as the main components were ground in a continuously operating ball mill at laboratory scale. The effect of grinding conditions was studied by changing the solids feed rate, the feed slurry density, the weight of ball charge and the mill rotation speed. The optima of these variables in terms of energy consumption and production rate of fine fractions were determined individually for each tested ore. The grinding efficiency with this mill, equipped with a screen as a grate and a classifier at the discharge end, could be improved by lowering the slurry density to 25% solids by weight, which is significantly lower than traditionally used in laboratory tests or industrial practice.

The flow properties of the mineral slurries in question were studied as a function of percent solids for a better understanding of the phenomena observed in the grinding testwork. The viscosities of the mill discharge slurries were measured with different slurry densities. Tracer tests were conducted with different water/solids ratios in the mill feed for measuring the residence times of bulk solids, various size fractions and water, The maximum discharge rates of slurries from the mill were also measured with various slurry densities. The grinding results are discussed based on the conclusions drawn from these measurements.