Author (yesmama). Submitted on Tue, 29 May 2012
A ball mill is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, and ceramics.
Concentrator have used two kinds of lattice-type and overflow ball mill.
Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles and stainless steel balls. An internal cascading effect reduces the material to a fine powder. Industrial ball mills can operate continuously, fed at one end and discharged at the other end. Large to medium-sized ball mills are mechanically rotated on their axis, but small ones normally consist of a cylindrical capped container that sits on two drive shafts (pulleys and belts are used to transmit rotary motion). A rock tumbler functions on the same principle. Ball mills are also used in pyrotechnics and the manufacture of black powder, but cannot be used in the preparation of some pyrotechnic mixtures such as flash powderbecause of their sensitivity to impact. High-quality ball mills are potentially expensive and can grind mixture particles with the combination of dryer machine to as small as 5 nm, enormously increasing surface area and reaction rates. The grinding works on the principle of critical speed. The critical speed can be understood as that speed after which the steel balls (which are responsible for the grinding of particles) start rotating along the direction of the cylindrical device; thus causing no further grinding.
Cylinder by a thick steel plate welded at both ends welded flange, respectively, is connected with the mill cover. Cylinder open on 1 or 2 into the hole for replacing the liner and the ease of inspection, the shape of the oval and rectangle. Cylinder wall is equipped with wear-resistant lining, to enhance and protect the barrel of the ball. Lining materials are mainly high-manganese steel, high chrome steel, cast iron and rubber. Rubber liner has a long life, low production costs, light weight,short installation time, the replacement of safety and noise and other prominent features. It has been widely used in domestic building materials and chemical industry.Wet grinding machine has been promoting the use.The effect is significant.rotary kiln:http://www.hx-china.com/19.html
High manganese steel liner is widely used.There are two types: one is the smooth surface of the liner, and the other non-smooth surface; coarse grinding commonly used non-smooth lining.
Feeder tube used to transport ore and internal grading machine back to the sand. Ore concentrator mill used to the device type are: drum, snail-shaped device to the mine and the joint three.
Grate hole size of fan-shaped grid plate and arrangement has a significant impact of the mill's production capacity and product fineness. Grate hole size should be able to stop the ball and not ground when discharging coarse particles in the exhaust, but also ensures that the slurry containing the smooth discharge of qualified size. To avoid clogging mineral particles, it should be made of trapezoidal cross-section of the grate holes, grate hole size to the direction of discharge end gradually expanded. Grate holes arranged in the form.In practice, the grid plate holes to use more inclined grate arrangement.
Grate holes arranged in the form.In practice, the grid plate holes to use more inclined grate arrangement.