Two Types of Grinding Machines free essay sample

Two types of grinding machines In materials processing a grinder is a machine for producing fine particle size reduction through attrition and compressive forces at the grain size level. See also crusher for mechanisms producing larger particles. In general, grinding processes require a relatively large amount of energy; for this reason, an experimental method to measure the energy used locally during milling with different machines was recently proposed. Ball mill A typical type of fine grinder is the ball mill. A slightly inclined or horizontal rotating cylinder is partially filled with balls, usually stone or metal, which grinds material to the necessary fineness by friction and impact with the tumbling balls. Ball mills normally operate with an approximate ball charge of 30%. Ball mills are characterized by their smaller (comparatively) diameter and longer length, and often have a length 1. 5 to 2. 5 times the diameter. The feed is at one end of the cylinder and the discharge is at the other. We will write a custom essay sample on Two Types of Grinding Machines or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Ball mills are commonly used in the manufacture of Portland cement and finer grinding stages of mineral processing. Industrial ball mills can be as large as 8. 5 m (28 ft) in diameter with a 22 MW motor, drawing approximately 0. 0011% of the total worlds power (see List of countries by electricity consumption). However, small versions of ball mills can be found in laboratories where they are used for grinding sample material for quality assurance. The power predictions for ball mills typically use the following form of the Bond equation: here †¢ E is the energy (kilowatt-hours per metric or short ton) †¢ Wi is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) †¢ P80 is the mill circuit product size in micrometers †¢ F80 is the mill circuit feed size in micrometers. Rod mill A rotating drum causes friction and attrition between steel rods and ore particles. But note that the term rod mill is also used as a synonym for a slit ting mill, which makes rods of iron or other metal. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency. We provide Professional technology, excellent product quality and intimate after-sales service when you purchase Stone crusher plant, Raymond mill, from our company. As a professional mining machinery exporter, we will win your trust with our delivery speed, Enterprises Credit and product quality. Rotary dryer : http://www. hxjqcrusher. com/Dryer. html Sand maker : http://www. china-crusher. com/sand-maker3. html