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根据工厂生产实践,分析了高炉锰铁渣的合理岩相组成及其对炉渣性能和(MnO)的影响。指出了采用较高Al2O3(13—17%)渣型时应保持渣中MgO5—7%,碱度为1.4—1.6;采用高MgO(8—12%)渣型时应控制渣中Al2O38—12%,碱度1.3—1.5。 相似文献
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用叔胺萃取铀分离钍及稀土的研究 总被引:2,自引:0,他引:2
胡海南 《稀有金属与硬质合金》1996,(1):4-7
对独居石苛性钠浸出,盐酸优溶产生的优溶渣的硫酸浸出液,用叔胺N235萃取铀分离钍及稀土进行了研究。结果表明:铀的萃取率大于99.5%,反铀液中ThO_2/U为(1.8~3.8)×10 ̄(-3),RE_xO_y/U为(1.0~1.6)10 ̄(-3),萃铀余液中的U/ThO_2仅为(3.5~5.6)×10 ̄(-5)。 相似文献
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根据工厂生产实践,分析了高炉锰铁渣的合理岩相组成及其对炉渣性能和(MnO)的影响。指出了采用较高Al2O3(13-17%)渣型时应保持渣中MgO5-7%,碱度为1.4-1.6;采用高MgO(8-12%)渣型时应控制渣中Al2O3 8-12%,硅度1.3-1.5。 相似文献
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精炼渣发泡性能的实验研究 总被引:7,自引:2,他引:5
对碱度为1.5 ̄2.5,FeO%〈0.6 ̄1.0的精炼渣进行了发泡性能的研究。实验在竖式电阻炉和200kg中频感应炉内进行,分别测试了精炼渣碱度,精炼渣中助熔剂含量和发泡剂组成等因素对渣起泡率η,发泡持续时间τ和发泡指数Σ的影响。 相似文献
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废弃锰矿焙砂浸出液的铁,钴,锰分离研究 总被引:3,自引:0,他引:3
本文对四川省某地废弃锰矿焙砂浸出液进行了铁、钴、锰分离工艺研究。研究结果表明,用MnO2作氧化剂,在溶液pH=1 ̄2,温度100℃,时间1h,MnO2用量为理论量的1.5倍的条件下,氧化了Fe^2+;氧化后控制溶液pH=3.8 ̄4.1,用浓度为6 ̄7%的石灰乳液中和除铁,铁的去除率可达98.05%;除铁后的溶液控制pH=4.5 ̄5.4,温度80℃,用20%Na2S溶液沉钴,Na2S的用量为理论量的 相似文献
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介绍了用金属锰粉制备Mn_3O_4的方法,运用正交设计分析了不同水平下的时间、温度、添加剂量,加料时间及加料量这5个因素对Mn_3O_4的Mn含量、MnO_2含量、松装密度和敲实密度达4个指标的影响,并对敲实密度这一指标进行了最优工程平均计算,在95%的置信度下,可以得到密度为1.24~1.42g/cm ̄3的Mn_3O_4. 相似文献
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以未浓缩低浓度工业钛液为水解原料,通过自生晶种稀释热水解的硫酸法钛白短流程工艺制备金红石型颜料钛白,研究了水解条件(底水量、熟化时间和水解时间)对偏钛酸和金红石产物的结构、粒径分布和颜料性能等的影响规律及数学回归关系。水解条件对水解初始形成晶种的数量和质量、晶粒的生长和聚集等起重要影响,并最终决定产品的颜料性能;水解条件与产物的晶体结构、颗粒多分散度和颜料性能间存在数学相关关系。最优水解条件为:底水量比例为0.123,熟化时间为29.05 min,二沸后的水解时间为2.6 h左右。 相似文献
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实验通过定组成的H2/CO2混合气控制氧分压,在温度为1873 K、1673 K、1473 K,氧分压为1.22×10-8~2.18×10-12 Pa、4.92×10-8~8.79×10-12 Pa的范围内,研究了TiOx-SiO2-MgO 系的析出相.结合XRD和EDS分析并对比汪大亚等人的研究可知,当氧分压较高(PCO∶PCO2=5∶1)时,对于初始成分TiO2∶MgO∶SiO2摩尔比为60∶25∶15的试样,在1873 K 和1673 K 时的析出相为TiO2,在1473 K 时其析出相为MgTi2O5;对于初始成分TiO2∶MgO∶SiO2摩尔比为60∶15∶25的试样,在1873 K时其析出相为TiO2,在1673 K和1473 K时析出相为MgTi2O5.而当氧分压较低(PH2∶PCO2=600∶1、300∶1、150∶1)时,2种不同成分的试样在不同温度下的析出相均为黑钛石,并且随着氧分压的降低,黑钛石中的Mg 含量逐渐减少. 相似文献
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Ti3Al对TiCu15Ni15钎料组织的影响 总被引:5,自引:0,他引:5
分别以0%,25%,50%,75%,100%比例的Ti3A1替换TiCu15Ni15中Ti,对所得的钎料进行组织形貌及成分分析。研究结果表明:钎料合金由先结晶低Cu,Ni含量相和后结晶的高Cu,Ni含量相组成,随TiaAl增加。低Cu,Ni含量相减少,高Cu,Ni含量相增加,同时由于Nb含量增加,背散射图像发生变化,先结晶相由灰色逐渐变为亮白色,后结晶相成分偏析增加,先结晶高Nb相为灰色,后结晶低Nb相为黑色,至5^#合金形态发生显著变化,灰色相由块团状变为短条或片状,其中央为白色边缘为灰色,这将引起性能变化。 相似文献
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The influence of elemental composition on the crystal structure, hydrogen storage and electrochemical properties for Mg-containing alloys was investigated. As La/Mg ratio decreased, the slight change of Ni content was detected. XRD results indicated that these alloys were composed of LaNi 5 and Mg-containing phases. The lattice parameters of Mg-containing phases decreased. Meanwhile, the mass fraction of Mg-containing phases varied with the change of La/Mg and Ni. The hydrogen storage capacity reached ~1.6 wt.% for La/Mg≧ 3 :1 and decreased to ~0.71 wt.% for La/Mg=1. Two hydrogen absorption processes were observed because of the existence of the multiphases for La/Mg≧ 3 :1. With decreasing La/Mg ratio, the equilibrium pressurerose due to the shrinkage of the lattice parameter. Meanwhile, one hydrogen absorption process was obviously present. The discharge capacity of these as-cast alloys was higher, but the cyclic stability was poor for La/Mg≧ 3 :1 due to the partial amorphisation. It was better for La/Mg≤2 although the discharge capacity was lower. The polarization resistance increased, contrarily the exchange current density decreased with decreasing Mg content. 相似文献
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The constitution of the partial system Al-Al8Mo3 is investigated using differential thermal analysis (DTA) and X-ray diffraction data. Ten (10) intermetallic phases are observed,
and their stability ranges with respect to composition as well as temperature are determined. The crystal structures of Al12Mo, Al5Mo(h), Al4Mo(h), and Al8Mo3 are corroborated, confirming literature data. The crystal structures of the phases Al5Mo(ht), Al5Mo(r), Al3+xMo1-x(h), and Al3Mo(h) are newly determined. For the phases “Al22Mo5” and “Al17Mo4,” powder diffraction patterns are obtained. The revised phase diagram Al-Mo (up to 28 at. pct Mo) is presented. 相似文献
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Raghavan Ayer L. M. Angers R. R. Mueller J. C. Scanlon C. F. Klein 《Metallurgical and Materials Transactions A》1988,19(7):1645-1656
Analytical electron microscopy studies were conducted on a rapidly solidified Al-8.8Fe-3.7Ce alloy and arc melted buttons
of aluminum rich Al-Fe-Ce alloys to determine the characteristics of the metastable and equilibrium phases. The rapidly solidified
alloy consisted of binary and ternary metastable phases in the as-extruded condition. The binary metastable phase was identified
to be Al6Fe, while the ternary metastable phases were identified to be Al10Fe2Ce and Al20Fe5Ce. The Al20Fe5Ce was a decagonal quasicrystal while the Al10Fe2Ce phase was determined to have an orthorhombic crystal structure belonging to space group Cmmm, Cmm2, or C222. Microscopy
studies of RS alloy and cast buttons annealed at 700 K established the equilibrium phases to be Al13Fe4, Al4Ce, and an Al13Fe3Ce ternary phase which was first identified in the present study. The crystal structure of the equilibrium ternary phase was
determined to be orthorhombic with a Cmcm or Cmc2 space group. The details of X-ray microanalysis and convergent beam electron
diffraction analysis are described. 相似文献