某复杂铜铅锌多金属矿选矿试验

针对某复杂铜铅锌多金属矿的性质特点,采用弱磁选脱硫—铜铅混浮—混合精矿铜铅分离—混浮尾矿选锌的原则流程对该矿石进行选矿试验研究。在矿石磨矿细度为-0.074 mm占90%的情况下,采用1次弱磁选选硫、1粗2精2扫铜铅混浮、1粗2精1扫铜铅分离、1粗3精2扫选锌、中矿顺序返回流程处理该矿石,最终获得了铜品位为24.79%、铜回收率为55.78%的铜精矿,铅品位为51.34%、铅回收率为83.55%的铅精矿,锌品位为45.63%、锌回收率为62.71%的锌精矿,硫品位为35.12%、硫回收率为80.08%的硫精矿。铜精矿含银229.53g/t,铅精矿含银196.20 g/t,铜、铅精矿中银的总回收率为50.29%。

STUDY ON THE SURFACE ELECTRIC CHARACTERISTICS OF FLAKE GRAPHITE AND THE MECHANISM OF ABSORPTION MEDICAMENT

It is of important significance to make studies on the sur-face electric characteristics of flake graphite and their variation law for strengthening the floatation of flake graphite.In this paper, DPM type microelectrophoresis apparatus is used to de-termine the surface Zeta-potential of flake graphite pure mineral, study the affection of pulp pH value, seueral kinds of inorganic salt ions and anion surface activation agent (petroleum sodium sulfonate ) on flake graphite surface Zeta-potential,and explore the surface absorption charac-teristics of graphite.The floatation experiment of flake graphite pure mineral shows that both the petroleum sodium sulfonate and inorganic salt can strengthen the conventional floatation of flake graphite. The surface characteristic varia-tion caused by them is also an important factor to promote graphite floata-tion.

栽培大豆起源的考古学探索

关于栽培大豆的起源,目前国内外学者基本达成共识,栽培大豆起源于中国。但在中国何处起源有多种说法,学者们根据历史文献、考古资料等,同时结合现生野生大豆的分布态势对大豆的分布、起源地进行了广泛而深入的研究。本文通过对植物浮选所获得的大豆遗存进行分析,结合历史文献以及野生大豆的生长习性等认为大豆在龙山文化时期起源于中国北方地区尤其是辽宁、河北、山西等省的山地、盆地地区。