【摘要】 本文研究了离心螺旋溜槽流膜特性,经系统测定找出了流膜运动规律,并分析了这些规律对选别矿物的作用。特别着重研究了离心螺旋溜槽正转、反转时“径向环流”的运动规律,推导了径向环流的理论公式,利用这些公式找出“中性面”的具体位置,提出了离心惯性力的增减与径向环流速度变化的相应关系,并认为合理地控制径向环流能强化分选过程。 对-200目的钒钛磁铁矿进行了选别试验,结果表明:当离心螺旋溜槽在正转速度在某一范围内增加时,精矿品位提高,富集效应显著,而当反转速度在某一范围内增加时,精矿品位降低,回收率提高。所以可适当控制转向及速度相互组合,找到最佳综合工艺参数。选别结果与理论分析是相一致的。更多还原

【Abstract】 In this paper represented is a study of the characteristics and role of the flowing film of a centrifugal spiral sluice, a new type of fine gravitation concentrator. The role of the flowing film movement was found as a sysmatic expermental measurement taken. Its effect to mineral separation was also analyzed. Emphasis was however concentrated on the role of the radical circulating flow occurred in both clockwise and counter clockwise rotation of the centrifugal spiral sluice. A theoretical formula was derived to locate the actual position of the so called neutral plane. A correlation between the increase or decrease in magnitude of centrifugal inertial force and the change in the radial circulating flow was proposed. It is believed that any separation can be reinforced if the radial circulating flow is under proper control. Testing results carried on a fine vantitanium magnetite ore of —200 mesh revealed that the concentrate grade increased and response in enrichment became remakable, when clockwise rotation speed of the centrifugal spiral sluice was increased within a certain range. However, when the counter clockwise rotation speed was increased within a certain range, the concentrate grade was dropped down and recovery was increased. Hence it was considered that comprehensive optimal operating parameters may possibly be found, if apposite control in a conbination of clockwise and counter clockwise rotation speed of the centrifugal spiral sluice. It may be said that separation principle of the centrifugal spiral sluice is dependent on its flowing film charactoristics, as there occurs an appropriate correlation between testing results and theoretical analysis.更多还原