an autogenous ag mill is a grinding mill used in the minerals processing industry. it is shaped like a huge drum on its side and spins rapidly to carry ore to the top using centrifugal force. gravity assists in smashing ore against other ore to pulverise rock to a size small enough to seperate minerals from gange.
the principal field for ball mill grinding has been the metalliferous ores and the more abrasive minerals. because of the mills inherent characteristics of simple operation and low maintenance, it is gaining acceptance for grinding materials formerly ground in other types of mills.
rotation of ball mill,is to use synchronous motor by coupling to make small gear rotate,and fixed on the cylindrical shell big gear to make cylinder rotate.grinding fine materials output with slurry by out-feed small holes on the board,out-feed end slurry surface is lower than middle spindle neck slurry effluent face,lower than low level,forced discharge.
the ore enters through one trunnion and leaves by the other. the mill is kept about half-full of balls and is driven at the speed at which their cascading and rolling action has the maximum crushing and grinding effect on the ore as it passes through under pressure of incoming feed ; the cascading action crushes the ore by impact and the rolling action grinds it by attrition.
ore grinding equipment most of the tonnage milled today is ground in one of the following types of equipment or a combination of two or more: ball mills, tube mills, rod mills, and stamps. chilean mills and huntington mills are used only in a few isolated cases today.
overflow discharge ball mill can grind ores into the size under 0.2 mm, so it is very suitable for the second grinding system. the capacity of it is about 15% lower than grate discharge ball mill in the same specification, and the loaded grinding medium is also less than that one.
ultra fine grinding ufg mills overcome these limitations by the use of rotating stirrers inside a stationary mill shell. ultra fine grinding mills have been in use for many years in a large number of every day applications such as pharmaceuticals, dyes, clays, paint and pigments before being used in the mineral processing industry.
ore grinding mills mineral processing amp; metallurgy. ball mills. ball mills have shells of cast iron or steel plates and are carried on hollow trunnions. ore is fed through a scoop, drum type, or combination feeder at one end and is discharged from the opposite trunnion.
the ball mill can grind various ores and other materials either wet or dry. there are two kinds of ball mill, grate type and overfall type due to different chat online. ball mills are used for wet grinding iron ore, gold/copper ore, nickel ore and other sag and ball mill for the wet grinding of gold/copper ore in south australia.