硫铁矿烧渣制备铁黄颜料的工艺研究

介绍了以硫铁矿烧渣为原料，采用湿法硫酸盐氧化法制备氧化铁黄的工艺过程。研究了Fe^2 浓度、空气流量、温度等因素对晶种制备及二步氧化过程的影响，确定了铁黄制备最佳工艺参数。经X－射线衍射，透射电镜测试，表明铁黄为针形α－FeOOH，产品达到HG／T（2249－91）标准。     

三正辛胺从HCI介质中萃取钯（Ⅱ）的动力学研究

研究了三正辛胺从HCl介质中萃取Pd（Ⅱ）的动力学和萃取机理，结果表明：三正辛胺和C1^-的质量浓度对萃取速率有较大的影响，ln（kf（Pd）／％（Pd））与lnC^oToA和ln[C1^-】分别成直线关系，直线斜率分别为2和-2。界面反应步骤是TOA萃取Pd（Ⅱ）速率的控制步骤，正向萃取反应活化能为21．154kJ．mol^-1，推导得出了萃取速率和正、逆向萃取速率常数比（kf（Pd）/kb（Pd）的理论方程，当[C1^-]≥0．10mo1·L^-1或[H^ ＋]≥10mo1·L^-1时，理论计算值与实测值吻合。     

矿山酸性废水综合治理工艺的探讨

研究了阶段中和沉淀法、阶段中和──硫化钠沉淀法、阶段中和──H2S沉淀法综合治理矿山酸性废水。根据试验结果，确定了四段中和──H2S沉淀法治理含铝量高的矿山酸性废水，使排放水水质达到国家排放标准，并从中回收了铜、锌、锰等有价金属离子。     

Preparation of colloidal Sb2O55 and its stability

Colloidal antimony pentoxide was prepared by oxidation of antimony trioxide with hydrogen peroxide as oxidant and phosphoric acid as stabilizer. Effects of stabilizer, oxidant amount and reaction temperature on the diameter of colloidal particles and their size distribution were discussed, And static electricity effects on colloidal stability were studied by measurement of Zeta potential. Results show that Zeta potential of colloidal Sb2O5 moves from -30mV to -56. 8mV with the addition of H3PO4 as the stabilizer, zero point of charge of colloidal H3 PO4-Sb2O5 moves from pH=1.85 to more acidic regions, and colloidal H3PO4-Sb2O5 is stable in wider pH range. The stable time of colloidal H3PO4-Sb2O5 particles without coagulation is more than six months. The size of colloidal particles is smaller and their distribution is narrower by adding H3PO4 as the stabilizer and decreasing reaction temperature, and theaverage diameter of H3 PO4-Sb2O5 particles prepared is 30nm.     

分银渣中贵金属的提取研究

对分银渣中金、银、铂、钯的回收利用技术分别进行了综合分析和讨论。实验结果表明 :分银渣中金、银的回收率均可达到 90 %以上 ,铂、钯的回收也可达到 80 %以上。     

Surface structure and catalytic activity of electrodeposited Ni-Fe-Co-Mo alloy electrode by partially leaching Mo and Fe

1 Introduction The chlorine alkaline industry and the production of hydrogen by electrolyzing water have disadvantages of high cost and energy consumption, so it is especially important to study and develop a high catalytic activity and good stability el…     

Preparation of salt-based colloid palladium of high concentration

A kind of salt-based colloid palladium of high concentration was prepared, with concentration up to 3.6g/L on amount of PdCl2. The optimal preparation conditions of the salt-based colloid palladium were that the PdCl2 and NaCl concentrations were respectively 3.6 g/L and 175 g/L, mole ratio of Sn to Pd was 50:1, reaction temperature was 20 -35℃, with urea, ascorbic acid and vanillin added in a proper amount. The test results of optimal condition show that the time of starting hydrogen-deposition is 9 s, the time of completely coating copper on a test substrate is 2 min, the stability time of colloid palladium is 98 h after it is diluted into 0. 1 g/L(on amount of PdCl2)when the solution temperature is 20 *C, the backlight lever of electroless copper plating layer is 10th grade of 10 grade system, the adhesion force of the copper layer is up to GB5270--85 of China, and the average particle size of the colloid palladium is 81 nm measured by Master Sizer.     

从硫酸溶液中还原制取金属碲粉

采用SO2作还原剂从含碲的硫酸溶液中制取碲粉,并确定了SO2从硫酸溶液中还原碲的最佳条件:反应温度80℃,NaCl浓度1.2 mol/L,SO2流量0.1 m3/h,反应时间40 min,碲的还原率达到99.63%。还原所得粗碲粉经亚硫酸钠脱硒,盐酸酸洗除杂处理,硒、砷、锡、铜的脱出率分别达到99%、93%、80%、87.5%,得到含碲99.669%的金属碲粉。XRD和SEM表征表明还原碲粉的形态为针状晶体。     

脉冲电沉积纳米晶镍—铁—铬合金（I）——电沉积工艺

在恒电位脉冲的条件下,pH控制在0.8～1,阴极电流密度为12～20A·dm-2,周期为25ms,占空比为0.3,镀液温度维持在20～30℃,采用循环镀液的方法以避免二价铬离子的干扰,从含三价铬离子的镀液中电沉积出镍 铁 铬合金。X射线衍射结果表明沉积的镀层为晶体结构,存在较强的(111)织构。能谱和扫描电镜的结果显示电沉积出的镍 铁 铬合金镀层中含有少量的硫,其晶粒尺寸小于100nm。通过这种方法可以获得厚镀层。电化学分析表明随着电流密度的增大,镀层的耐蚀性相应增强。     

高着色力氧化铁黑颜料的制备

采用氧化沉淀法制备铁黑颜料。研究了柠檬酸、十二烷基硫酸钠、硝酸铵和聚乙二醇4种添加剂对铁黑颜料的着色力、颜色和粒径的影响。结果表明：柠檬酸作添加剂，可以制得粒径小、粒径分布窄、着色力好的氧化铁黑颜料，聚乙二醇的效果其次，硝酸铵的效果最差；颜料粒径是影响其着色力的主要因素，粒径越小，着色力越高。