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提出了用ICP-AES法同时测定铁矿石中钒,钛,铝,铜,锰,砷元素的分析方法。选用元素最佳分析谱线和仪器合适的工作条件测定,RSD〈3%,回收率在95%~105%之间。本法测定铁矿石中钒,钛,铝,铜,锰,砷含量的分析误差和精密度符合GB/T6730的技术要求,结果令人满意,方法快速、简便。 相似文献
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在硝酸-高氯酸介质中,采用原子吸收光谱法连续测定钼精矿、钼焙砂中杂质元素。在选定的最佳工作条件下测定钴、镍、镁、铜、钙,回收率为95.0-106.4%,相对偏差为1.3-5.8%。该法准确、快速、简便,应用于钼精矿、钼焙砂中钴、镍、镁、铜、钙的测定,结果满意。 相似文献
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本文采用ICP-AES法对Al—Mo中的铝、钼、硅、铁的测定进行了研究,使用了直接背景校正法,选择了最佳测定条件,测定了各元素的含量,得到较好的精密度和准确度,用于生产实践中结果令人满意。 相似文献
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使用ICP全谱直读等离子体发射光谱仪测定锌合金中的Al、Pb、Fc、Cd等元素,进行了最佳谱线的确定、最佳测定条件的选择,结果证明该方法简便快速,准确度及精密度均达到分析要求。 相似文献
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使用5E-CHN2200元素分析仪测定煤样中的碳、氢、氮含量,在方法标定、样品测定以及不同称样量对测定结果的影响进行了探讨。对部分煤标准样品和普通煤样进行测定,以验证本测定方法的精确度和准确度。结果表明:在精确度试验中,煤标准样品中碳、氢、氮含量的测定结果相对标准偏差(RSD,n=10)在0.07%~0.68%;在准确度试验中,煤标准样品中碳、氢、氮含量测定结果与其认定值有较好的一致性,普通煤样中碳、氢、氮含量测定值也与使用其它经典方法的测定值基本吻合。本测定方法具有操作简单、分析周期短、准确度高、稳定性好等优点,能够满足煤炭分析领域的实际检测需求。 相似文献
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提出以DL-半胱氨酸作释放剂,选择性螯合滴定法分别测定铜、锡、锆、汞、钯和铊。已分别用于测定各种合金和矿样中的铜、锡、锆、汞、钯和铊,结果满意。 相似文献
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本文采用离心浇铸制样,x射线荧光光谱法测定镍铁中Si、P、Ni和Co的含量,研究了镍铁的制样条件和分析条件,测定其精密度和准确度。该方法测定值与化学值一致性较好,具有准确、快速、精密度高等优点。 相似文献
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通过采用一步纳米金属颗粒辅助化学刻蚀法(MACE)成功制备了多孔硅纳米线, 并主要研究了硅片掺杂浓度、氧化剂AgNO3浓度以及HF浓度对硅纳米线阵列形貌结构的影响规律. 研究结果表明: 较高的掺杂浓度更有利于刻蚀反应的发生和硅纳米线阵列的形成, 这是由于高掺杂浓度在硅片表面引入了更多的杂质和缺陷, 同时高掺杂浓度的硅片与溶液界面形成的肖特基势垒更低, 更容易氧化溶解形成硅纳米线阵列; 在一步金属辅助化学刻蚀法制备多孔硅纳米线阵列的过程中, 溶液中AgNO3浓度对于其刻蚀形貌和结构起到主要作用, AgNO3浓度过低或过高时, 硅片表面会形成腐蚀凹坑或坍塌的纳米线簇, AgNO3浓度为0.02 mol·L-1时, 硅纳米线会生长变长, 最终形成多孔硅纳米线阵列. 随着硅纳米线的增长, 纳米线之间的毛细应力会使得一些纳米线顶部出现团聚现象; 且当HF溶液浓度超过4.6 mol·L-1时, 随着HF酸浓度的增加, 硅纳米线的长度随之增加. 同时, 硅纳米线的顶部有多孔结构生成, 且硅纳米线的孔隙率随HF浓度的增加而增多, 这是由于纳米线顶部大量的Ag+随机形核, 导致硅纳米线侧向腐蚀的结果. 最后, 根据实验现象提出相应模型对多孔硅纳米线的形成过程进行了解释, 归因于银离子的沉积和硅基底的氧化溶解. 相似文献
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副产SiCl4生产光纤用高纯SiCl4 总被引:7,自引:0,他引:7
本文探讨了从生产多晶硅副产物中综合回收利用SiCl4并提纯使其达到生产光导纤维秀的质量要求。SiCl4作为生产光纤光缆的基础原料,其质量好坏直接影响光纤光缆的质量。SiCl4是工业硅原料与HCl气体合成产物的一部分,其杂质含量很高。研究探讨光纤用SiCl4中各种杂质元素和其它化合物存在的形态、除去的方法和其对光子传递及光通信的影响和危害,并建立工业化光纤用高纯SiCl4生产线是本文研究的目的。将生 相似文献
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《Hydrometallurgy》1986,16(1):69-75
Purification of metallurgical grade silicon to solar grade silicon has been investigated by acid leaching of pulverised silicon and by copper alloying processes. The acid leaching process involved refluxing silicon with aqua regia and HF. Leaching with HF was found to be more efficient than leaching with aqua regia. The copper alloying process, which involved melting silicon in the presence of copper, electroextraction of copper (for reuse) from CuSi alloys and acid washing of anode slime, was also found to yield silicon of suitable purity. 相似文献
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The distribution of silicon in a series of as-cast white irons containing up to 3.25 pct Si and from 2.39 to 3.94 pct C was
studied using electron probe microanalysis. The silicon content of the proeutectic austenite dendrites is a linear function
of the silicon content of the alloy. The periphery of these dendrites is richer in silicon than the core due to the rejection
of the element from the cementite formed during eutectic solidification and the enrichment is most pronounced at slow rates
of solidification. It was also firmly established that silicon is present in the eutectic cementite, the level increasing
with solidification rate and with the silicon content of the alloy. The nonuniform distribution of silicon persisted for a
large part of a graphitization anneal. The effects of the silicon in the cementite and at the austenite-cementite interface
on the nucleation of graphite during first stage graphitization are discussed in terms of the thermodynamics of graphitization. 相似文献
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Fuzzy Prediction of Silicon Content for BF Hot Metal 总被引:1,自引:0,他引:1
LI Qi-hui LIU Xiang-guan 《钢铁研究学报(英文版)》2005,12(6):1-4
Therearemanyfactorsinfluencingthequality ofhotmetalinBFprocess.Themostimportant threefactorsarehotmetaltemperature,hotmetal siliconcontentandslagbasicity[1].Siliconcontentis animportantfactorreflectingthestateofthelower partofblastfurnaceforblastfurnaceop… 相似文献
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Jafar Safarian Leiv Kolbeinsen Merete Tangstad 《Metallurgical and Materials Transactions B》2011,42(4):852-874
Thermodynamic knowledge about liquid silicon is crucial for the production of solar-grade silicon feedstock from molten silicon.
In the current study, liquidus for silicon binary alloys is formulated using a previously developed method in which the liquidus
curve is calculated using two constants. The liquidus measurements for the silicon portion of the silicon alloys with Al,
Ca, Mg, Fe, Ti, Zn, Cu, Ag, Au, Pt, Sn, Pb, Bi, Sb, Ga, In, Ni, Pd, Mn, and Rh are reviewed, and the consistent data were
used to determine the liquidus constants. The liquidus curves for silicon binary systems are calculated and plotted. It is
indicated that the calculated liquidus curves fit well with the experimental data. A correlation between the determined liquidus
constants is also observed, which can be used to gain a better understanding of the thermodynamics of the silicon binary melts. 相似文献