差示吸光光度法测定铅锡基合金中锑

研究了铅锡基、锡基合金中常量锑的测定方法．在1．5～2．5mol／L硫酸介质中，锑（Ⅲ）与碘化物形成黄绿色络合物，在425nm处有最大吸收．锑离子浓度增加时，适当加大显色剂浓度，使显色反应尽可能完全，使用差示吸光光度法使碘化物光度法测锑由低含量推广到常量．     

再生除铅剂精炼除铅的工业试验

进行了再生除铅剂精炼除铅的工业试验。试验表明，锑火法精炼中再生除铅剂的除铅效果与普通除铅剂基本相同，可替代普通除铅剂使用。     

铊对测定硫酸锌溶液中锑的影响与对策

介绍了铊对硫酸锌溶液中锑测定结果的影响，在铊含量高或者过低时，采用改进后的孔雀绿分光光度法测定锑，可满足生产的要求。     

集中粗选分速精选能提高锑浮选指标

本文介绍了作者在难选锦矿石浮选过程中改变过去传统的选矿流程，采取集中粗选、分选精选的选矿方法，坚持饥饿加药的原则，获得了锑精矿品位为６０．６６％、锑浮选回收率为９０．０５％的较好浮选指标。     

烟化法低品位锑氧粉的还原熔炼研究

采用X-射线衍射，电子探针等多种手段，研究烟化法低品位锑氧粉的化学成分，物相组成等特性，进行烟化法低品位锑氧粉的还原熔炼试验，结果表明，烟化法低品位锑氧粉与鼓风炉锑氧粉相比，成分复杂，杂质含量高；其物相组成以等轴品系Sb2O3为主，另有少量斜方晶系Sb2O3，其它则为无定形碳，石墨，赤铁矿（Fe2O3)，石英（SiO2)等，实验确定的还原熔炼适宜工艺条件为：配加碳酸钠12%，不外配碳质还原剂，不原熔炼温度1000℃，熔炼时间45min，在此适宜条件下，锑还原回收率达到76%。     

Magnetic properties of NiSb2O4

The magnetic transition of the antimony oxide NiSb₂O₄ has been studied using heat capacity measurements and magnetic susceptibility data. The Néel temperature previously evaluated from neutron diffraction is confirmed: T_N = 45 ± 1 K. The entropy excess ΔS(20 – 60 K) associated with the transition is calculated and compared with the theoretical value. The susceptibility data are interpreted in terms of a Curie-Weiss law (θ_p = − 98K, M_eff = 3.98 μ_ß). Exchange integrals are evaluated.     

纳米锑颗粒粒径对润滑油摩擦性能的影响

采用硅烷偶联剂KH-570作为表面分散剂,利用机械球磨法制备了不同粒径的纳米锑颗粒,将其分散到900SN基础油中,在CFT-1型材料性能测试仪上进行往复式摩擦实验,考察其作为润滑油添加剂的摩擦学性能。采用SEM和EDS分析了45钢钢盘磨损表面的形貌和化学成分。结果表明:纳米锑颗粒以微观填充与黏着的机制对磨损表面起到修复作用。随着纳米锑颗粒粒径的减小和摩擦载荷的增大,试验润滑油的减摩、抗磨效果越明显。其中,含粒径为40 nm的锑颗粒润滑油在高载荷下表现出优异的减摩与抗磨性能。     

某金锑矿选矿试验研究

对某Sb品位7.94%、Au品位1.95 g/t的石英脉型金锑硫化矿进行了浮选试验研究。采用混合浮选工艺,以丁基黄药和丁铵黑药为捕收剂、硫酸为pH值调整剂、硝酸铅和硫酸铜为活化剂,经一次粗选三次精选三次扫选闭路浮选,获得了产率20.17%、Sb品位和回收率分别为37.35%和94.87%、Au品位和回收率分别为7.79 g/t和80.39%的金锑混合精矿,精矿品级符合锑精矿质量标准(YB 2419—82)中硫化锑精矿三级品,金和锑都得到较好地回收。     

pH measurement in the vicinity of a cathode evolving hydrogen gas using an antimony microelectrode

An antimony microelectrode was prepared by quenching a molten Sb–Sb2O3 mixture (2% Sb2O3). The local pH in the vicinity of a cathode evolving hydrogen gas was directly measured using the microelectrode. The local pH during electrolysis of KCl-glycine aqueous solutions was increased by proton consumption; however, the increment decreased with increasing concentrations of glycine, a buffering agent. The diffusion-limiting current density of hydrogen evolution involving proton reduction was controlled by the concentrations of the proton-donating species: protonated-glycine +H3NCH2COOH and H3O+ ions. A plot of the current density against the sum of the concentrations gives a single straight line passing through the origin. The phenomena are discussed in terms of electrodeposition processes of base metals.     

Electrochemical behaviour of the antimony electrode in sulphuric acid solutions—II. Formation and properties of the primary anodic layer

The formation of an anodic layer during the oxidation of antimony in sulphuric acid solutions as well as the structure and properties of the layer have been studied using linear sweep voltammetry, potentiostatic oxidation, ac impedance measurements, X-ray diffraction analysis and scanning electron microscopy. The electrochemical investigations as well as the shape of the impedance spectra during electrode passivation indicate that the surface layer probably has a complicated structure. Under the conditions of these experiments the passivating film is mainly amorphous, gel-like, exhibiting good ionic conductivity and a relatively high dissolution rate. Assuming that the anodic layer consists mainly of antimony hydroxide a reaction scheme for the growth and dissolution of this film is presented.