steel rods (rod mills), steel balls (ball mills), and rock material (autogenous mills, pebble mills). ROD MILLS The grinding charge in a rod mill consists of straight steel rods with an initial diameter of 50-100 mm. The length of the rods is equal to the shell length inside
Mar 08, 2021 Mar 08, 2021 Ball mill and rod mill are suitable for different materials. 1. Selection by material's hardness. Ball mill has a strong adaptation of material, and it is suitable for grinding hard materials, such as slag, iron ore, copper ore, etc. Rod mill
DOVE Rod Mills are supplied in a wide range of capacities and specifications. DOVE supplies 2 models of small Rod Mills designed for laboratories milling process, capacity range of (5000g/Hr – 20 Kg/Hr). For small to large scale grinding operations, DOVE Rod Mills are supplied in 9 models, capacity range of (3 TPH – 180 TPH)
At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 m. Adjustment of grinding parameters:
mill. As such, primary ball mills should be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, & Williams, 2006). On
Mar 20, 2020 Mar 20, 2020 Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size is relatively larger
The rod mill usually uses 50-100mm diameter steel rod as grinding medium, while the ball mill uses steel ball as grinding medium. The length of steel rod is 25-50mm shorter than the cylinder, and it is usually made of high carbon steel with carbon content of 0.8% – 1%; the loading capacity of rod is about 35% – 45% of the effective volume
Apr 24, 2020 Apr 24, 2020 In 1870, on the basis of ball mill, rod mill with uniform discharge size was developed. In 1908, a self-grinding machine without grinding medium was created. From the 1930s to the 1950s, the United States and Germany successively developed roller bowl mills, roller disc mills and other vertical shaft medium speed mills
Jean-Paul Duroudier, in Size Reduction of Divided Solids, 2016. 3.7.4 Performance. Rod mills are used in an open circuit between crushing and the ball mill. They often operate in wet and where the pulp contains up to 50% solid by mass. This machine is equally very applicable to dry where it could take a feed that has achieved 6% moisture
in the ball mill and rod mill. respectively, and 0.87 for quartz ground in the ball mill and rod mill. These slopes compare quite well experimentally with the values of IX from the size distribution of these materials, as would be expected from equations (4) and (5). The log Kx -log.~ plot for rod milling
Apr 09, 2015 Apr 09, 2015 Ball mills. Ball mill (Fig 1) is same kind of mill as rod mill, except that it is filled with balls instead of rods. Because of balls have greater ratio of surface area than rods they are more suitable for fine grinding. Balls are also lighter, so the kinetic energy of a single dropping ball is smaller than a rod
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Jul 05, 2020 Vibration mills are similar to ball mills in that particles of the materials are crushed between porcelain or metal balls and the mill body. ... Higher grinding rate in the range of fine particles. Disadvantages of Vibration Mill. 1. ... We are looking for a mill that can handle 100- 300kg of product as a
Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod
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