X-Ray荧光光谱仪分析烧结矿粒度效应试验研究

在X-Ray荧光光谱仪分析中，有关粒度效应对原料分析结果的影响，国内已进行了多年研究。实验表明，当颗粒本身的吸收减至很小时，可以消除某些矿物相的影响。如用不同矿物配置生料，有85％的生料通过200目（75μm）时，A、B两组铁矿石原料中SiO2的强度和浓度可自成线性关系，当粒度达到325目（44μm）时，两组铁矿石原料的实验点均落在同一曲线上。该试验说明：     

X-射线荧光光谱法测定颗粒灰中二氧化硅、氧化钙、氧化镁

颗粒灰主要用于炼钢时造渣和脱硫,也用于作为焙烧人造富矿———烧结矿及球团矿的熔剂。测定其组分多采用滴定法,方法不但分析时间长,滴定终点不好掌握,且工作效率低,消耗费用高。采用先烧损再压片的X-射线荧光光谱分析方法[1-2],分析时间长,不能满足生产的急需。本文运用熔融法制样,然后用X-射线荧光光谱法测定,既消除了矿物效应、粒度效应,也克服了基体效应。另外因颗粒灰中烧失量较大,在熔融成片前定量加入了Co2O3,并将分析元素的测量强度与Co的强度比同浓度进行线性回归,得到了理想的分析精密度和准确度。本方法分析速度快,满足了生产…     

X-射线荧光光谱法在铁矿石分析中的应用

介绍了用偏硼酸锂(33％)和四硼酸锂(67％)混合助熔剂熔融制样，加补钴粉做内标，采用X-射线荧光光谱法定量测定铁矿石中的TFe，SiO2，CaO，MgO，Al2O3，P，S含量，经大量实验数据证明：X-射线荧光光谱法完全符合误差要求、精密度高、准确可靠，不仅大大缩短了分析时间、提高了工作效率，而且降低了劳动强度。     

能量色散X射线荧光光谱法测定铁矿石中化学成分

采用压片制样-能量色散X射线荧光光谱测量铁矿石中11种组分(TFe、MgO、Al₂O₃、SiO₂、P、S、TiO₂、CaO、Mn、Cu、Zn)。通过试验确定保持压力30 MPa、时间30 s的压片制样条件和样品的粒度为200目(74 μm),同时,通过采用化学方法定值的生产样品应用于校准曲线的绘制,可最大程度地减少矿物效应和粒度效应对分析结果造成的影响。采用经验系数法进行谱线的重叠校正和组分间的吸收和增强效应校正,各组分校准曲线的相关系数均大于0.999。对同一个铁矿石样品进行精密度考察,各组分测定结果的相对标准偏差(RSD,n=10)为0.14%～5.8%。对铁矿石实际样品进行正确度考察,测定值与滴定法测定全铁、电感耦合等离子体原子发射光谱法(ICP-AES)测定其他元素的分析结果一致。实验方法尤其适用于大宗铁矿石样品的批量分析。     

X射线荧光光谱法测定铁矿石中各组分

采用高温熔融对铁矿石试样进行预处理,以消除矿物效应。X射线荧光光谱法测定铁矿石中TFe,Al2O3,CaO,MgO,SiO2,P,Cu,Pb,Zn,As,Sn,Ti,Mn时,应用SUPERQ软件中的理论系数法、经验系数法对各组分进行校正,计算出各组分分析曲线的校正常数和拟和精度,得到最佳工作曲线,取得满意的结果。     

波长色散X-荧光光谱法测定铁矿石中镍、铬含量

采用玻璃融片、波长色散X-荧光光谱法[1-3]测定铁矿石中镍、铬含量,使用经ICP法准确定值、涵盖被测矿种的试样绘制工作曲线,运用经验系数法用三元线性回归的方法求出"强度—含量"公式及各次系数,对基体进行校正,计算试样中待测组分含量。方法准确度、精密度满足分析要求,适用于铁矿石、铁精矿、烧结矿、球团矿等含铁物料中镍、铬的测定。     

MgO/Al2O3对烧结矿冶金性能的影响

采用实验室烧结杯试验装置,研究MgO/Al_2O_3在0.8～1.2时,MgO/Al_2O_3对烧结矿强度、粒度组成、RDI和RI的影响,采用金相显微镜和X-射线衍射仪对烧结矿微观结构和矿物组成进行分析。表明:随着MgO/Al_2O_3的增加,烧结矿强度呈先升高后降低的趋势,且当MgO/Al_2O_3为1.0时,强度最好,10～40 mm粒度所占比例为58.85%。随着MgO/Al_2O_3由0.8增加到1.2的过程中,烧结矿RDI得到改善,还原性变差。当MgO/Al_2O_3在0.9～1.0时,球团矿微观形貌和矿物组成较好,在此范围内,赤铁矿和复合铁酸钙数量较多,强度较好。在用进口矿和本地磁铁矿搭配烧结时,MgO/Al_2O_3控制在0.9～1.0范围内,微观形貌和冶金性能较好。     

X射线荧光光谱法测定铁矿石中全铁及18个次量成分

采用X射线荧光光谱法测定铁矿石中主量成分（TFe）及18个次量成分（P、SiO2、Al2O3、CaO、MgO、Mn、TiO2 、V2O5、K2O、S、Cr2O3、Ni、Co、Zn、Pb、Cu、Na2O、As）。以固定理论α影响系数法校正基体效应,使各成分的适用检测范围都得到较大拓宽;采用熔融方法制样,消除了试样的粒度效应和矿物效应。为了避免S的损失,样品经预氧化后灼烧,由软件计算或准确测定样品的烧失量。精密度试验表明,各成分的标准偏差（SD）为0.001%～0.268%。方法用于铁矿石实际样品分析,结果与其他方法结果相吻合。     

利用二级筛分控制烧结矿粒度效应对X-荧光压片分析法的影响

通过X射线荧光光谱粉末压片法分析烧结矿中的TFe．SiO2、Ca0、MgO、Al2O3等成分的含量，在制样过程中采用标准化研磨方法和二级筛分控制样品的粒度，在光谱仪上测量样品的X射线荧光强度。通过软件计算出样品的化学成分含量。实验结果表明，采用该方法测定的数据结果稳定，精确度高，可满足生产工艺的要求。     

熔融法测定铁矿石中SiO2的测量不确定度评定

介绍了X射线荧光光谱熔融法检测铁矿石中SiO2的方法,对X射线光谱仪熔融法测定铁矿石中SiO2的分析结果产生不确定度的原因进行了分析.根据CSM01010108-2006对其进行了评定,建立了相关数学模型.并将评定的参数引用于日后的测量结果的不确定度评定,为其他元素的测量不确定度评定提供了可借鉴的经验.     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.