Process for treating molybdenite concentrates to produce a lubricant
grade product
    1.
    发明授权
    Process for treating molybdenite concentrates to produce a lubricant grade product 失效
    处理辉钼矿精矿以生产润滑剂级产品的方法

    公开(公告)号:US3991156A

    公开(公告)日:1976-11-09

    申请号:US573542

    申请日:1975-05-01

    摘要: A simple, efficient and economical process for purifying molybdenum disulfide concentrates by contacting and digesting the molybdenum disulfide feed material with an aqueous acid solution containing a controlled combination of hydrofluoric acid and sulfuric acid in a manner to convert substantially all of the contaminating silica bearing minerals therein to aqueous soluble fluoride and sulfate compounds and any contaminating lead sulfide compounds to lead sulfate compounds, and thereafter washing, neutralizing and drying the purified molybdenum disulfide powder product. In accordance with a preferred practice, when the molybdenum disulfide feed material contains in excess of about 0.1% iron as an indication of pyrite concentration, the concentrate is calcined at an elevated temperature in a nonoxidizing atmosphere prior to the digestion step to effect a conversion of the pyrites to synthetic pyrrhotites, which are softer and less abrasive and are more acid soluble. The product thus derived is eminently suitable for use in the formulation of lubricants and as an intermediate in the synthesis of high purity molybdenum compounds.

    摘要翻译: 通过使二硫化钼原料与含有氢氟酸和硫酸的受控组合的含水酸溶液接触和消化来纯化二硫化钼浓缩物的简单,有效和经济的方法,以便将基本上所有的污染二氧化硅承载矿物转化为其中 将含水溶性氟化物和硫酸盐化合物和任何污染的硫化铅化合物转化成硫酸铅化合物,然后洗涤,中和和干燥纯化的二硫化钼粉末产物。 根据优选的实践,当二硫化钼原料含有超过约0.1%的铁作为黄铁矿浓度的指示时,在消化步骤之前,在非氧化气氛中在高温下煅烧浓缩物以实现转化 黄铁矿合成的磁黄铁矿,其较软,较少磨蚀并且更易溶于水。 由此得到的产品非常适用于制备润滑剂和作为合成高纯度钼化合物的中间体。

    Hydroelectric plant draft tube water level control
    4.
    发明授权
    Hydroelectric plant draft tube water level control 失效
    水电站引水管水位控制

    公开(公告)号:US5436507A

    公开(公告)日:1995-07-25

    申请号:US212116

    申请日:1994-03-14

    摘要: A control system for synchronous condensing operation of a hydroelectric turbine-generator wherein the draft tube water level for the turbine is controlled through the use of that generator's power or current consumption. Either parameter may be used in the process. Water impacting the turbine will increase both of these parameters above an optimum minimum value. Either a generator power or current device provides a signal to a control circuit. When the signal from either device exceeds a preset value, the control circuit injects compressed air into the turbine cavity until the signal returns to its optimum value.

    摘要翻译: 一种用于水力涡轮发电机的同步冷凝操作的控制系统,其中通过使用该发电机的功率或电流消耗来控制用于涡轮机的引流管水位。 在此过程中可以使用任一参数。 影响涡轮机的水将会将这两个参数提高到最佳最小值以上。 发电机功率或电流装置向控制电路提供信号。 当来自任一装置的信号超过预设值时,控制电路将压缩空气注入到涡轮空腔中,直到信号恢复到其最佳值。