铜铁钼镍合金中组分的测定

本文介绍了铜铁钼镍合金中各组分的测定,样品用王水消解处理,用Y为内标元素,以待测元素的含量为横坐标,待测元素积分强度和内标元素积分强度的比值为纵坐标绘制工作校准曲线,采用内标法进行检测。本文分别从仪器测量条件的选择,分析谱线的选择,精密度测试及加标回收等几个方面进行了试验,结果表明,本方法测试结果准确度高,重现性好,RSD1%(N=11),回收率在99%～101%之间。     

化学检测中校准曲线质量控制要点

从校准曲线的绘制和检验2方面论述了校准曲线控制的要点内容。在绘制校准曲线时,应从空白校正、与试样相同的处理、标准样品值的范围、检测点数、重复检测数、线性范围及吸光度范围7个方面控制。校准曲线的检验包括相关系数检验、截距检验及剩余标准偏差或相对偏差的检验。     

定量校准曲线法测定超高纯试剂丙酮中铁含量的研究

目前最常用的分析曲线法(标准曲线法、校准曲线法)、内标法、标准加入法等,对丙酮这类基体成分丰富的样品测定,其定量校准存在显著的系统误差.实验证实,通过保证标准系列中基体组成、浓度及酸度与待测样基本相同,来制作工作曲线进行定量校准(下称定量校准曲线法),能得到较为理想的结果.     

原子吸收法测定水中铜的实验室内质量控制

通过绘制校准曲线、标准样品、平行样、加标回收率测定和质量控制图绘制等实验室内质控措施来分析评价试验数据的准确性和精密度。结果:校准曲线线性良好,相关系数达0.9999;标准样品测定在真值范围内,平行样精密度<6.1%;实际水样加标回收率在99.2%～101%间;质控点没有系统偏离,数据随机分布在均值两侧,质控图分布合理。     

分光光度法测定水中挥发酚的一些问题及处理方法研究

用光度法测定水体中的挥发酚,实验探讨了校准曲线的绘制、萃取过程中漏液现象的处理、比色时间的控制问题,提出了改进措施。实施改进方法以后,提高了样品分析的准确性。     

散射背景内标法测定1：5万区域地球化学调查样品中铀、铜、铅、锌、钍

粉末压片法制样、国家一级标准物质绘制标准曲线、用散射背景内标法结合经验系数法校正基体效应。铀的检出限可以达到0．65×10^-6,各含量段的测定准确度和精密度也都优于规范设定的监控限。实验表明,用散射背景内标法测定1：5万地球化学调查样品中的U是可行的。其他Cu、Pb、Zn、Th的各项质量参数也都优于规范要求。     

气袋采样-气相色谱法苯系物中甲苯测定的不确定度评定

根据《检测和校准实验室能力的通用要求》中的线性拟合法,对固定污染源废气中苯系物的测定。以甲苯为代表物质,进行不确定度评价。方法参照GB/T22554-2010(基于标准样品的线性校准)的技术规范要求,绘制甲苯的标准曲线。根据其标准曲线的数据,用统计学方法,获得本次固定污染源废气中甲苯的测定,其扩展不确定度为±5.524 mg/m3。     

X荧光光谱法分析含有碳化硅的炮泥中二氧化硅、三氧化二铝的含量

采用X射线荧光光谱仪分析含有碳化硅的炮泥中SiO_2、Al_2O_3的含量,以高炉渣等一系列标样混合制备的标准样品作为校准样品进行工作曲线的绘制,曲线适应炮泥中SiO_2、Al_2O_3的含量范围。灼烧后的样品用四硼酸锂、碳酸锂做熔剂,高温熔融制样消除粒度效应。将该方法与化学法进行对照,分析结果准确度能够满足需求,且快速、简便。     

裂解气相色谱内标法测定天然胶乳中干胶含量

研究用热裂解气相色谱（PGC）内标法测定天然胶乳中干胶含量。试验结果表明,以丁苯橡胶（SBR）为内标物和以纯天然橡胶（NR）为标准物绘制的标准曲线线性好;以标准曲线为基准,在天然胶乳中添加内标物后进行PGC测试,即可直接得出天然胶乳中的干胶含量。PGC法测定结果准确,操作简便。     

水泥、生料、熟料和窑灰的X射线荧光分析方法研究(续)

4.校准曲线将标准样品的各成分含量换算为灼烧基含量,如表7所列,依其与荧光X射线强度(总计数)的关系绘制各成分的校准曲线。由图6可知,对于SiO_2校准曲线,S4、S5点稍有偏离;由图7可知,对于CaO校准曲线,S1点稍有偏离。这是由于7513窑灰补正标样和S1～S5生料标样系列之间的基体(主要是CaO和SiO_2)差异造成的,这更加说明1:4.5的稀释比确实不足以完全消除Si～Ca之间的吸收—增强效应。通常,只用S1～S5五点连线,不产生这种偏离,适用于水泥、生料和熟料样品。现采用7513对S1～S5连成的原校准     

腐植酸对发展绿色低碳经济意义重大

<正>两百多年来,人类被"高碳"长烤。今天你"低碳"了吗?已成为人类共同的问候。哥本哈根世界气候大会刚结束,我们就迎来了以"腐植酸绿色产业与低碳经济发展"为主题的"第八     

Effect of Zircon Addition on Properties of Low Carbon Al2O3-C Refractories

Using tabular alumina as aggregate,tabular alumina fines, reactive alumina ultra-fines, aluminum powders,silicon powders,carbon black,flake graphite,B4C and zircon fines as matrix,low carbon Al2O3- C refractories were prepared. Influences of zircon powders additions( 0,3%,5% and 7%,in mass,the same hereinafter) on properties,phase composition and microstructure were investigated. The results show that the ZrO2- nitride can be in-situ formed through carbothermal reduction and nitridation in Al2O3- C refractories.With the increase of zircon powder,the oxidation resistance of the Al2O3- C refractories improves obviously,the oxidized layer thickness decreases from 7. 94 mm without zircon to 2. 71 mm with 5% zircon. HMOR at 1 400 ℃of the Al2O3- C refractories reaches the maximum 14. 9MPa when zircon addition is 5%. With the increase of zircon powder,the apparent porosity and bulk density change a little,CMOR and CCS increase.     

Influences of Polyvinyl Alcohol on Synthesis of A95 Polycrystalline Alumina Fibers

In order to improve the spinnabilities of A95 alumi- na silica sols, the influences of addition and polymeriza- tion degree of polyvinyl alcohol on spinnabilities of alu- mina silica sols were researched. The viscosity and rheo- logical properties of the sols, mierostructure, infrared spectra, average diameter and diameter distribution oJ the gel fibers, BET specific surface area and distribution of pore diameters were measured. The results show that iJ there is no spinning agent, the A95 sols have no spinna- bility ; when PVA 2099 addition is in the range of l. 0% -2.0% （in mass, the same hereinafter） , the prepared sols have good spinnability, the gel fibers produced are thin and uniform, and the shot content is low ; BET spe- cific surface area and gas absorption amount of A95 polycrystalline alumina fibers are the largest when PVA 2099 addition is 2. 0% ; the gel fibers are thick and non-uniform, and the shot content is high when PVA 2099 addition is 4. 0% ; with polymerization degree oJ PVA increasing, the average diameter and diameter dis- tribution range of the gel fibers increase gradually; when using PVA 1799 and PVA 1899, respectively, the spun gel fibers are thin and uniform.     

Abstracts Selected from Naihuo Cailiao （Refractories）——A Chinese Language Bimonthly

Development and prospect of China＇ s refrac- tory industry equipment/Liu Junguang, WeiTong//Naihuo Cailiao. - 2013,47 （5） ：321 Alasttact： China＇ s refractory equipment including me- chanical equipment and kilns developed rapidly in the past two decades by technological innovation, advanced products introduction and independent research and de- velopment based on the former Soviet Union＇ s aid. In recent years, some high efficient equipment was devel- oped covering fields of fine grinding, burdening, mix- ing,shaping and firing,etc. In the new developing peri- od of refractory industry from big to strong, the ad- vanced refractory equipment shall be well researched and developed ,and be well spread taking the opportu- nity of raw materials homogenization and purification, capacity large scale, quality and pollutants reduction. improvement, energy saving     

腐植酸产业低碳化技术解决途径探讨

<正>随着全球人口和经济规模不断增长,环境污染问题越发严重。近百年来,大气中二氧化碳(CO2)浓度的不断升高,导致全球正在经历一场以地球变暖为特征的显著气候变化。以低消     

Study ＆ application of the desliming pond for flotation feed

Aiming at the special feature of Panyi Coal Preparation Plant, i. e. its coal slime being high-ash and highly degraded,a process of deslime-ilotation proposed;owing to the inferior performance of a small diameter classifying cyclone, a new desliming pond for flotation feed designed;introduced are its structure, working principle and special feature;based on ex periment results a regressive equation with 9 relevances derived in which the average velocity of upward current taken as the in dependent variable.     

Environmental-friendly Ramming Materials for Mud Package and Taphole of Large-scaled Blast Furnaces

The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers makes structure of ramming materials dense. During the process of extruding mud and ramming materials, SiC is partly oxidized ; CaO , F% 03 and carbon penetrate towards the outer wall. The improvement of ramming materials can inhibit the penetration of molten slag, iron and carbon. The bulk density of environmental-friendly ramming ma- terials dried at 200 ℃ is 2.90 g · cm-3, the cold com- pressive strength of this kind of ramming materials dried at 200 ℃ is about 17. 0 MPa and fired at I 450 ℃ is about 39. 2 MPa.     

Determination Method of Thermal Expansion Coefficient of Cordierite

Cordierite ceramics were prepared by using talc, bauxite and kaolin clay as starting materials. According to the detected resuh of XRD step-scanning from 25° to 35° by a high temperature X-ray diffractometer, 20 and d values of five peaks of cordierite crystal were ascer- rained. Then the least squares technique was used to cal- culate the crystal parameters ： at 25 ℃ , a = b = O. 981 8 nm, c =0. 927 4 nm, V=O. 774 3 nm3 ; at 600 ℃ , a =b =O. 982 0 nm, c=0.9252 nm, V=O. 773 5 nm3. The crystal volumetric coefficient of thermal expansion （CTE） and linear CTE along a and c axes were calcu- lated, αv = 2. 33 × 10-6℃-1, αa = αb, = 3. 27 × 10-6℃ -1 , αc = -4.19 ×10-6℃ -1. The average CTE of cordierite crystal is as low as O. 78 × 10-6℃ -1     

Properties and Microstructure Evolution of Al203-Si Material Fired in Different Atmospheres

A1203-Si composite specimens were prepared using fused corundum, ultra-fine α-A1203 and Si powder as starting materials and resin as binder. Effects of sintering atmospheres on properties, phase composition and microstructure of specimens after firing at 1 500 ℃ were investigated. The results show that： （ 1 ） after .firing in oxidizing or weak oxidizing atmosphere, there is some Si in the specimens and some glass phases containing mullite form on specimen surface, the density and strength at room temperature are relatively high, but hot modulus of rupture and thermal shock resistance are relatively poor; （2） after firing in, weak reducing or reducing atmosphere, Si reacts completely with CO or N2forming whisk-phere, Si reacts completely with CO or N2forming whisk-er-like SiC, granular Si2N20 or 0＇-SiAION, and the er-like SiC, granular Si2N20 or O＇-SiMON, and the thermo-mechanical properties of specimens are enhanced;（3） after firing in nitrogen atmosphere, Si reacts completely with N2, CO or G forming wbisker-like SiC and columnar β-SiA10N crystals, the hot modulus of rupture and thermal shock resistance of specimens are enhanced noticeably.     

合成氨工艺操作仿真培训系统的开发应用

介绍了合成氨工艺操作员仿真培训系统的架构,合成氨OTS系统的前期准备、功能设计、模型开发、系统集成、测试验收等开发过程,实现的功能和应用情况。