rapid determination of bond rodmill work index by,generally, bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. in the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on.bond work index of a mill,see this useful summary table of bond work index by minerals for any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size.
the standard bond rod mill work index test procedure is firstly to stage crush the feed to pass 12.7 mm, and size a representative sample. the test then involves a series of batch grinds in a standard bond rod mill. a bond rod mill is 0.305m by 0.610m, with wave liners (of a form described by bond), which runs at 40rpm and tilts as described
rod mills are very similar to ball mills, except they use long rods for grinding media. the rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. to prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6.
calculating crushing constant using bond s law. calculating crushing constant using bonds law bond work index formula-equationee this useful summary table of bond work index by mineralsor any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the work index always means the equivalent amount of energy to reduce one ton of bond s law for crushing mills -.
the titan bond work index rod mill is one-piece cast construction with integral wave liners of a form described by bond. this mill is used to perform the necessary metallurgical testing to determine the grinding characteristics of ores and power requirements for operating production-size rod mills.
the bond work index for rod mill is a special equipment for testing bond rod mill work index. simple lab test can choose rod mill by power method or judge the effects of material properties change to the rod milling process or the operation condition of rod mill by using this equipment. from 1980s, the company developed the equipment and
generally, there are three bond indices ball, rod and crushability. the bond ball and rod indices are determined using standard ball and rod mill, respectively, and are suitable for grinding. the bond crushability index, which is estimated using a standard impact crushability test, is suitable for crushing21. because the jaw crusher was
rod mill power is dependent on mill capacity and work index. mill power increases with increasing rod charge increasing mill speed increasing mill length. rowland and kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods pm /
figure 5 bond rod mill work index v. unconfined compressive strength 0 100 200 300 400 ucs (mpa) 5 10 15 20 25 30 35 wirm (metric) the lack of fit observed relating the crushing work index was expected to carry over to the other bond work indices. figure 5 displays the plot of rod mill work index (wi rm) versus ucs. these
bond ball mill work index, bwi, kwh/t 13.4 bond rod mill work index, rwi, kwh/t 18.1 table 1. example of ag/sag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability.
you can also review the step-by-step bond work index test procedure i posted here. see thisuseful summarytable of bond work index by minerals. for any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to
bond f. c., crushing tests by pressure and impact, trans aime, vol 169, 1947, pp 58-66. bond rod mill grindability test. the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requirements when sizing ball mills. various correction factors may have to be applied.
bond test wis (kwh/t) crushing16.0 rod mill 14.5 ball mill 13.8 bond standard circuit work index w1 16.0 x (10 / sqrt 16,000) (10 / sqrt 165,000 ) 0.9 kwh/t
oct 24, 2018 however, bond work indeces are related to the type of equipment to be used (rod mill, ball mill, sag uses drop ball parameter-kwhr/m3-, so it is
assume the test wi of the rod mill (9.5) applies from the actual rod mill feed size of 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 mill (circuit) product size of 1,000 m. 10 10 w1( ) (
determination of the work index for ball and rod mills in 1952 and modified it in 1961. the standard bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load. the standard procedural outline of the test is stated in (bond) 1961. the work index for a ball mill, wi, is then calculated from the following
grinding circuits (crush-rod-ball mill or crush-ball mill). by the 1970s, the application of bond ball mill work index test is used to calculate the work index related to fine grinding (mib).
jan 01, 2016 bond rod mill work index, rw i 5 mm bond ball mill work index, bw i. the correlation between coarse particle comminution parameters tends to be rather poor as testing hardness of coarse particles tends to be dominated by breakage through fractures and fissures in the rock rather than through the rock itself.
the mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. ag/sag mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a
ball mill bond work. insmart bonds ball-mill work index is a measure of the resistance of the material to grinding in a ball mill. this index is widely used in the industry for comparing the resistance of different materials to ball milling, for estimating the energy required
bond ball mill work index (and modified bond work index) data can be used in the ceet grinding simulator.the abrasion test determines the abrasion index, which can be used to determine steel media and liner wear in crushers, rod mills, and ball mills. get price bond work index formula-equation. 2014-6-27 3- standard bond tests the bonds
aug 01, 2005 the bond work index is one of the most useful and interesting parameters used in designing grinding equipment. however, it must be obtained under restrained conditions, especially in regards to the bond standard lab mill. the main objective of this study is to show how this index can be obtained using a denver ball mill, which is present in most mineral processing laboratories. the
dec 12, 2016 the basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are material to be ground, characteristics, bond
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