高温合金定向凝固过程中通道偏析的物理模拟研究

利用NH4Cl-H2O溶液凝固实验,对高温合金定向凝固中的通道偏析进行物理模拟,研究通道偏析的形成过程以及溶液中NH4Cl的质量分数w(NH4Cl)和初始基板温度对通道偏析数目和形貌的影响。结果表明,除了w(NH4Cl)为15%外,w(NH4Cl)为24%、27%和30%的NH4Cl-H2O溶液凝固时均形成通道偏析。随凝固时间延长,通道偏析数目先逐步增加然后减少,形貌辨识程度增加。随w(NH4Cl)增加,通道偏析数目减少,形貌辨识程度增加。随初始基板温度下降,通道偏析数目减少,形貌辨识程度增加。影响通道偏析的主要因素可归结为影响偏析形成和通道形成的因素,包括合金成分、温度梯度和凝固速率。     

石蜡相分光光度法测定汞的研究

研究以双硫腙为显色剂,石蜡为固体萃取剂,石蜡相分光光度法测定污水中汞。结果表明:汞-双硫腙络合物(Hg(HDZ)2)在pH10.0NH3.H2O-NH4Cl介质中可以定量地被石蜡萃取,30mL溶液中汞在0～20μg范围内符合比尔定律。除铅、铋、锌外,其他共存离子对测定无干扰,铅、铋、锌可在pH1.2时用双硫腙萃取除去。方法用于污水中汞的测定,RSD为3.3%,结果比较满意。     

P204萃取分离锑铁工艺研究

萃取分离锑铁是脆硫锑铅矿矿浆电解工艺过程的一个环节。P2 0 4可选择性地在NH4 Cl介质溶液中萃取铁。在 35 %(体积百分数 )P2 0 4、相比 (O/A) 1∶1、3级连续逆流萃取条件下 ,铁萃取率达 80 %～ 84%,锑、银基本不被萃取。含Fe总 1～ 1 4g/L的萃余液可返回矿浆电解循环使用。     

MgCl2溶液对烧结矿低温还原粉化率的影响

试验测定了 Mg Cl2 溶液不同浓度和喷洒量对济钢现有原料条件下烧结矿低温还原粉化率 (RDI)和还原度 (RI)的影响。结果表明 :每 5 0 0 g烧结矿喷洒 10～ 2 0 m L浓度为 1.0 %～ 3 .5 %的 Mg Cl2 溶液 ,能显著降低烧结矿的 RDI,且还原度不受影响 ,以 5 0 0 g烧结矿喷洒浓度为 2 .5 %的 Mg Cl2 溶液 10 m L综合效果最佳 ,可使烧结矿的 RDI从 3 6%降至 4.4%。     

从废旧高温合金中提取Re的试验研究

针对高温合金高致密性、难溶解的特点,采用真空气雾化法将废旧高温合金制成活性很高的细微颗粒,再经氧化酸浸后,废旧高温合金粉中的Re以ReO-4形态进入溶液,Re浸出率达99.02%;酸浸液用NaOH饱和溶液调pH值至1.5后,用D296型阴离子交换树脂吸附Re,Re吸附率达98.76%;解吸过程中先用NH3·H2O+NH4Cl混合溶液解吸D296负载树脂上的Mo,Re损失率为4.97%,再用NH4SCN溶液解吸Re,Re解吸率达94.98%;含Re解吸后液可通过添加KCl或NH4Cl蒸发浓缩冷却结晶工序制备含Re产品,控制浓缩液中Re浓度大于22.38g/L,Re结晶率可达90%以上。X射线荧光光谱分析结果表明,所获得的KReO4和NH4ReO4产品纯度分别达到了99.21%和99.58%。     

溴酸钾氧化偶氮胂M褪色动力学光度法测定痕量铊(Ⅲ)

基于0.08mol/LH2SO4介质中,痕量铊(Ⅲ)催化溴酸钾氧化偶氮胂M(AsAM)的褪色反应,建立了测定痕量铊(Ⅲ)的催化光度法。讨论了酸度、反应物浓度、反应温度、时间、干扰离子等因素的影响。研究了反应的最佳条件,并测定了一些动力学参数,催化反应的表观活化能为70.12kJ/mol。方法检出限为0.17μg/L,线性范围为0～20μg/L。在25mL溶液中,测定0.5μg铊(Ⅲ)的相对标准偏差为3.4%(n=11)。结合溶剂萃取分离技术,用于测定废水及土壤样品中痕量铊(Ⅲ),回收率为97.0%～103     

水杨醛肟催化光度法测定煤矸石中痕量锰

研究了在NH3·H2 O -NH4 Cl缓冲溶液中痕量锰 催化过氧化氢氧化水杨醛肟 (SAO)的显色反应 ,催化程度与Mn 量在一定范围内呈线性关系。借此建立测定痕量Mn 的催化光度法。结果表明 ,有色溶液的最大吸收波长为 410nm ,方法检出限为 1.2× 10 -11g/mL ,催化程度与Mn 量在 0～ 0.30 μg/2 5mL范围内符合比尔定律 ,可用于测定煤矸石中的痕量锰     

废杂铜氨性蚀刻溶铜工艺研究

研究了在CuCl2-N H3-N H4 Cl和CuCl2-CuSO4-N H3-N H4 Cl体系中蚀刻废杂铜,考察了蚀刻液组成、铜氨溶液中初始离子质量浓度、温度、溶液流动状态、蚀刻液 pH 等因素对铜溶解速率的影响。结果表明：CuCl2-NH3-NH4Cl体系中,在铜质量浓度120～165 g/L、氯质量浓度150～200 g/L、pH 8．0～8．5、温度45℃、强化流动条件下,废杂铜的蚀刻速率为0．25 g/（min · L ）;CuCl2-CuSO4-N H3-N H4 Cl体系中,在铜质量浓度35～75 g/L、氯质量浓度35～80 g/L、p H 10．0～11．0、温度45℃、强化流动条件下,废杂铜的蚀刻速率为0．33 g/（min · L ）。     

原子吸收法快速测定金精矿中的银

采用王水+H2O2+NH4Cl+HF溶样体系封闭溶样法对金精矿进行预处理,制得样品溶液后以原子吸收法测定银;其测定范围1000 g/t,RSD为4.5%,测定60个样品仅需3 h。该方法具有简单快速、成本低、对环境友好等特点,其分析结果可满足选冶工艺生产的要求。     

离子交换分离-电感耦合等离子体原子发射光谱法测定锰矿中铊

锰矿用盐酸、硝酸、氢氟酸和高氯酸溶解,以氢氧化钠溶液调整试液酸度至pH 1.7～2.0,用溴水氧化Tl 为Tl,过D401离子交换树脂柱,经0.015 mol/L硝酸淋洗后,用2 mL 3 g/L亚硫酸溶液还原柱上的Tl为Tl,再用0.015 mol/L硝酸洗出Tl,选择Tl 190.857 nm为分析谱线,电感耦合等离子体原子发射光谱法(ICP-AES)测定分离后溶液中的铊。方法中铊的检出限为1 ng/mL,测定下限为0.8 μg/g。干扰试验结果表明,测定0.1 μg/mL铊,不大于50 μg/mL铁、2 μg/mL锰、10 μg/mL铝、镉、铬、镍、铅、锌不干扰。一般锰矿样品按实验方法分离和测定,铁、锰、铝、镉、铬、镍、铅、锌不影响铊的测定。按照实验方法测定锰矿样品中的铊,测定结果的相对标准偏差(RSD,n=8)在1.6%～11%之间,加标回收率为90%～108%。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources