Review of the last lesson
Types of classifiers
Hydraulic classifiers (vertical current classifiers) normally consist of series of sorting columns through each of which a vertical current of water is rising and particles are settling out.
Horizontal Current Classifiers include Settling cones and Mechanical classifiers. Settling cones are often used in the aggregate industry to deslime coarse sands products. And, Mechanical classifiers have widespread use in closed-circuit grinding operations and in the classification of products from ore-washing plants.
The Hydrocyclone is a continuously operating classifying device that utilizes centrifugal force to accelerate the settling rate of particles. It is widely used in closed-circuit grinding operations but has found many other uses, such as de-sliming, de-gritting, and thickening.
Uint4 Lesson1
Principles of Gravity Concentration
重力选矿是按照矿石中不同矿物之间的密度差异而实现矿物分离的一种选矿方法.
重力选矿是在一定的流体介质中进行的，所用介质通常为水，亦有时用空气或重介质(重液或重悬浮液)。 重选可选性准则（系数）
Review of the last lesson
Principles of Gravity Concentration
Gravity processes are relatively simple and produce comparatively little environmental pollution.
It is essential for effective separation that a marked density difference exists between the mineral and the gangue. Some idea of the type of separation possible can be gained from the concentration criterion.
The motion of a particle in fluid is dependent not only on its specific gravity, but also on its size.
Gravity separators are extremely sensitive to the presence of slimes (ultra-fine particles), which increase the viscosity of the slurry and hence the sharpness of separation, and obscure visual cut-points
The feed to jigs, cones, and spirals should, if possible, be screened before separation takes place, each fraction being treated separately
Almost all gravity concentrators have an optimum feed pulp-density, and relatively little deviation from this density cause a rapid decline in efficiency.
Lesson2
Jigs
跳汰选矿:矿粒混合物在垂直升降的变速介质流中，按密度差异进行分层和分离的过程，谓之跳汰选矿。跳汰选矿的过程中所使用的介质可以是水，也可以是空气。
跳汰过程：颗粒群的松散、不同密度矿物颗粒的分层、不同密度矿物颗粒分离。
