Cu（II）、Ni（II）离子在蛇纹石表面的吸附及对其浮选的影响

通过吸附量测试、纯矿物浮选和红外光谱分析,研究Cu2+和Ni2+离子在蛇纹石表面的吸附过程及对蛇纹石浮选的活化机理.Cu2+和Ni2+离子在蛇纹石表面的吸附符合二级动力学模型,等温吸附过程符合Langmuir等温吸附模型,吸附能够自发进行,为物理吸附和化学吸附的共同作用,Cu2+和Ni2+离子在蛇纹石表面的吸附量随p H值升高而增大.Cu2+和Ni2+离子在弱碱性条件下对蛇纹石具有活化作用,活化机理为铜镍的氢氧化物沉淀和羟基络合物作用于蛇纹石表面,形成活性位点,黄药在活性位点上吸附生成黄原酸铜或黄原酸镍,从而使蛇纹石表面疏水性增大,浮选受到活化.      

Hardening mechanism in melt-quenched Al-Zn-Mg-(Cu) alloys

The effect of various hardening factors on the mechanical properties of melt-quenched high-strength Al-Zn-Mg and Al-Zn-Mg-Cu alloys is considered. Alloys with zirconium and Group VIIIA metals are shown to have high mechanical properties. The high strength of these materials is achieved due to the precipitation of Al₃Zr (Ll₂) metastable phase particles and to a pronounced aging effect in materials alloyed with cobalt and nickel. High-strength melt-quenched 01949 (Al-Zn-Mg), 01959, and 01979 (Al-Zn-Mg-Cu) alloys containing zirconium, cobalt, and nickel are developed using these phenomena.