底流型磁力旋流器分选铁矿的理论分析与试验研究

发布时间：2018-03-10 03:30

本文选题：黄铁矿　切入点：重介质旋流器　出处：《武汉科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：针对磁铁矿精矿的精选和黄铁矿的分选，本论文设计了一种底流型磁力旋流器，并通过模拟和计算对这种底流型磁力旋流器的磁力系统进行了分析，结果表明：这种磁力系统在竖直方向的磁感应强度分量平行于旋流器轴线，并指向线圈中心，，水平方向磁感应强度分量指向旋流器壁。该磁力系统主要有两个作用，其一，在磁感应强度较大时，可以牵引磁铁矿进入沉砂，从而增大沉砂中磁铁矿的回收率；其二，磁感应强度较小时，可以增加旋流器锥体下部矿浆密度，形成一个较高密度层，同时还可以提高旋流器内旋流与外旋流之间过渡层的密度，最终达到分选矿物的目的。磁铁矿精矿精选的试验表明，磁铁矿原矿品位为66.0%，经过底流型磁力旋流器精选后，磁铁矿精矿品位提高了1.5个百分点，此时电流为0.3A，回收率为84.00%。这说明调节底流型磁力旋流器的磁感应强度可以精选磁铁矿精矿；这部分试验还表明，当使用磁铁矿粉作为重介质旋流器重介质时，若磁力系统位于旋流器锥体底部时，则最适合分选矿物。最后进行了磁力重介质旋流器分选黄铁矿的试验，试验首先找到一个合适的重介质旋流器的分选条件，然后在这个合适条件下加入磁场。实验结果表明：重介质旋流器分选黄铁矿的效果明显优于普通型旋流器，在原矿品位为29.27%的条件下，后者的精矿品位为35.50%，前者精矿品位为39.30%，重介质旋流器最佳分选条件如下：磁铁矿粉粒度为-37μm占83.4%，沉砂嘴直径为12mm，给矿压力为0.1MPa。磁力重介质旋流器的试验表明当电流为0.3A，磁感应强度为8×10-3T时，分选效果最好，硫品位可以提高到42.4%，当沉砂浓度较高时只提高底流浓度不利于分选。
[Abstract]:Aiming at the separation of magnetite concentrate and pyrite, a kind of bottom flow type magnetic cyclone is designed in this paper, and the magnetic system of this kind of bottom flow type magnetic cyclone is analyzed by simulation and calculation. The results show that the magnetic induction intensity component in the vertical direction is parallel to the axis of the cyclone and points to the center of the coil, and the magnetic induction intensity component in the horizontal direction points to the wall of the cyclone. When the magnetic induction intensity is high, the magnetite can be towed into the settling sand, thus increasing the recovery rate of the magnetite in the settling sand. Secondly, when the magnetic induction intensity is small, the slurry density in the lower cone of the cyclone can be increased and a higher density layer can be formed. At the same time, the density of the transition layer between the swirl and the outer swirl in the cyclone can be increased, and finally the mineral separation can be achieved. The test of magnetite concentrate cleaning shows that the grade of magnetite concentrate is 66.0%, and the grade of magnetite concentrate has been improved by 1.5% after the bottom flow type magnetic cyclone cleaning. The current is 0.3 A and the recovery rate is 84.00. This indicates that the magnetic induction intensity of the bottom flow type magnetic cyclone can be purified from the magnetite concentrate. The experiments also show that when the magnetite powder is used as the heavy medium of the heavy medium cyclone, If the magnetic system is located at the bottom of the cyclone cone, it is most suitable for mineral separation. Finally, the experiment of separating pyrite with magnetic heavy medium cyclone is carried out. First, a suitable separation condition of heavy medium cyclone is found. The experimental results show that the separation effect of heavy medium cyclone for pyrite is better than that for ordinary type cyclone, and when the grade of raw ore is 29.27%, The concentrate grade of the latter is 35.50, the former is 39.30, the optimum separation conditions of heavy medium cyclone are as follows: the granularity of magnetite powder is -37 渭 m, the diameter of sand mouth is 12mm, and the pressure of ore feeding is 0.1 MPA. The test of magnetic heavy medium cyclone shows that when the current is 0.3A and the magnetic induction intensity is 8 脳 10 ~ (-3) T, the separation effect is the best, the sulfur grade can be raised to 42.4%, and when the sand concentration is high, it is not good to increase the bottom flow concentration.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951

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