钼精矿氧化焙烧脱硫的研究

在八层焙烧炉内采取同一焙烧制度,辽宁钼精矿脱硫合格率高于陕西钼精矿。本文从理论和实验两方面研究其原因,并对陕西矿的焙烧工艺采取降温措施防止过热而产生烧结,使其脱硫合格率达到与辽宁矿相同的标准。     

铁硫化物／石墨烯纳米复合材料溶剂热法一步合成

以二茂铁和硫磺粉作为铁源和硫源,乙醇或邻二氯苯为溶剂,利用溶剂热法一步合成了FeS2／石墨烯和Fe2S8／石墨烯纳米复合材料;采用X射线衍射（XRD）法、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对产物的晶相结构和形貌进行了分析与表征;并研究了原料的配比及溶剂对产物的组成和形貌的影响．当二茂铁与硫磺粉的摩尔比为1：2．5时,所得产物为Fe7S8／石墨烯纳米复合材料;而当它们的摩尔比为1：2时,所得产物为FeS2／石墨烯纳米复合材料,使用乙醇或邻二氯苯为溶剂合成所得FeS2／石墨烯纳米复合材料的形貌有较大的差异．     

Formation and mechanical properties of Zr-based bulk metallic glass composites with high oxygen levels

Zr-based bulk metallic glass(BMG) composites with in situ formed Y 2 O 3 particle reinforcements were synthesized by proper additions of Y to ultrahigh-oxygen-containing glass-forming alloy precursors.Microstructures,thermal stabilities,and mechanical properties of the composites were investigated.Glass formation was greatly enhanced by Y additions in the alloys and the resultant particles were homogenously distributed in the glassy matrix,allowing for the fabrication of oxide dispersion strengthened BMG composites.The compressive strength and hardness increased by 10% and 20%,respectively,with the introduction of Y 2 O 3 particles.These results are significant for the design and production of Zr-based BMGs and BMG composites with improved properties using commercial high-oxygen content raw materials under industrial conditions.     

Effect of Ag addition on the thermal stability and glass-forming ability of Zr<Subscript>35</Subscript>Ti<Subscript>30</Subscript>Cu<Subscript>7.5</Subscript>Be<Subscript>27.5</Subscript> bulk metallic glass

The thermal stability and glass forming ability (GFA) of Zr35-xTi30Cu7.5Be27.5Agx (x = 0-10) alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and ultrasonic techniques. We found that the addition of 1 at.% Ag can considerably enhance the GFA as indicated by an increase in the critical glass dimension from 15 mm in the Zr35Ti30Cu7.5Be27.5 alloy to 20 mm in the Zr34Ti30Cu7.5Be27.5Ag1 alloy. However, with the addition of more Ag the supercooled liquid region (△Tx) and y parameter (defined as Tx/(Tg+Tl)) drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a decrease in the GFA. Additionally, the elastic constant (the ratio of shear modulus to bulk modulus or Poisson’s ratio) was also used as a gauge to evaluate the GFA in Zr35-xTi30Cu7.5Be27.5Agx alloys.     

Facet effect of copper(I) sulfide nanocrystals on photoelectrochemical properties

14-facets polyhedra chalcocite Cu2S nanocrystals were synthesized by a solvothermal method. It was found that the presence of trio-n-octylphosphine during the synthesis was essential for the exposure of unconventional {110} faces. Results from photoelectrochemical measurements indicated that the polyhedra bounded by {110} facets exhibited much higher activities than the Cu2S hexagonal plates with only {001} facets.     

吉林省磐石市小红石砬子铅锌块状硫化物矿床的特征及意义

磐石市小红石砬子银铅锌多金属矿区处在磐石—永吉—双阳海西期花岗岩与石炭系碳酸岩建造的外接触带,产在中生代北西向线性火山断陷盆地内,位于海西晚期近圆形的火山穹隆构造南东部,属于块状硫化物型银铅锌多金属矿床;通过对该矿床地质特征的描述,区域分布规律及其成矿机理的探讨,为吉中地区寻找类似矿床打开了思路。     

2,5-二(4-氨基苯基)-1,3,4-噁二唑合成方法的优化

建立了一种2,5-二(4-氨基苯基)-1,3,4-噁二唑的最佳合成方法。以对硝基苯甲酸和盐酸氨基脲为原料,多聚磷酸为脱水剂,150~160℃的条件下反应2h,高收率(89%)制得中间体2,5-二(4-硝基苯基)-1,3,4-噁二唑;然后在DMF溶剂中以Na2S为还原剂,于100℃的条件下反应4h,中间体还原得到目标产物2,5-二(4-氨基苯基)-1,3,4噁二唑。此反应具有时间短、收率高且后处理简单、产物容易提纯等优点。     

Zr基非晶合金准静态压缩下的多重剪切带行为

利用IUTM和SEM研究了Zr-Ti-Ni-Cu块状非晶合金的准静态单轴压缩变形和断裂行为. 研究表明:该合金的室温压缩变形过程主要表现为弹性和塑性变形,塑性变形阶段没有加工硬化现象. 在准静态压缩条件下Zr基非晶合金表现出多重剪切效应,提高了塑性. 微观研究证明,剪切带的滑移分枝与相互交叉是非晶合金塑性提高的主要机制. 沿着剪切带发现了微空洞和微裂纹,剪切带的形成与自由体积的合并有关. 塑性变形过程中形成脉纹状断口形貌,受力状态的不同脉状花纹表现为不同的形式.     

粉煤灰脱硅液FeSx-CuS共沉淀法深度除铁实验

粉煤灰碱法提取氧化铝中间产物——粉煤灰脱硅液中含有较高含量的Fe元素,严重制约了脱硅液在超白玻璃生产等对Fe含量有严格限制的领域的应用。研究采用FeS_x-CuS共沉淀法对粉煤灰脱硅液进行了深度除铁处理。以硫化钠为絮凝剂、以硫酸铜为助凝剂,通过实验研究了二者用量及配方比对Fe离子的沉降、脱除效果。实验结果显示,粉煤灰脱硅液投加硫化钠于65~70℃下絮凝反应5 min,后降温至45℃,加入五水硫酸铜保温反应30 min助凝,最后静置24 h,可将脱硅液中Fe元素进行有效脱除。硫化钠添加量为Fe_2O_3摩尔质量的300倍;且硫化钠与硫酸铜的最佳摩尔质量配比为3∶2时,粉煤灰脱硅液中Fe_2O_3含量被降至最低检出限以下,同时Cu离子残留亦最低,有利于超白玻璃等生产。     

金属材料表面二次冶金对电击穿的影响

研究了合金真空击穿后,表面二次冶金过程及表面熔化层的显微组织对真空电击穿的影响．介绍了真空击穿的实验过程,测定了ＣｕＣｒ５０、真空Ｃｕ、４０Ｃｒ及ＣｒＣｕ５０中添加ＷＣ等合金的耐电压强度Ｅｂ,并对ＣｕＣｒ５０合金一次击穿和经１００次击穿后的表面组织进行了观察．研究结果表明：材料的首击穿具有选择性,电击穿老炼是电弧作用下表面发生二次冶金的过程,在ＣｕＣｒ合金中添加ＷＣ提高了Ｃｒ相的耐电压强度．