The SAG Grindability Index (SGI) test, or alternatively the trademarked SAG Power Index (SPI), is a SAGspecific test involving a small batch SAG mill that is charged with a two kilogram ore sample and ground until the product has achieved an 80% passing size of mm.
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F80 is the milling circuit feed 80% passing size, µm, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically for 80% passing six inch mill feed and when no pebble crusher is present). WiBM is the Bond ball mill work index, unitless CFnet is an empirical adjustment to a ball mill circuit [CFnet = × ln(P80)]
grindability is Bond's work index which is defined as the resistance of the material to grinding. The standard equation used by them for the ball mill work index (Bond work index) is as follows. 230. 82 1 10 / 80 > 10 / 80 1. P G P F W i bg i u (4) In designing and optimizing a milling circuit using Bond
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 equation. [7] where P is the closing sieve size ( m), Gbp is the grindability (net g/rev.), F80 and P80 are the 80% passing size of the feed and the product ( .
Bond Grindability Index Test Ball Mill 911Metallurgist A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving Fred C. Bond's grindability tests with this standard BWi test ball mill.
This mill has been operating ineffi ciently due to the hard coarse feed. The rod mill work index has not been de ned as yet. The ball fi mill work index is con rmed at 16 kWh/t. The operating fi work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high ineffi ciency.
using a jaw crusher with a 10 mm openside setting to suit the feed size requirements of the pilotscale subsample was further crushed to minus mm and the. Bond ball mill grindability index was determined following the standard procedure. The closing screen size was selected as 212. µm for the
The mill speed was maintained at 101rpm, the ball size at 25mm and the ball mass to sample mass ratio was kept constant at 10:1. The mill was run for 2min., 4min., 6min., 8min., and 10min. each.
ball mill size calculation Grinding Mill China. The optimal ball diameter in a mill. grinding quartz and copper ore in a laboratory ball mill, there has been defined a general form of the equation for determining the optimal ball diameter depending on the grain size being ground; and the parameter of the equation through.
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80 is accepted based on the required grainsize characteristics of the ball mill discharge. Considering the Bond energy law and the correction factors by Rolland, the total specific energy E req required for comminution of mineral from the initial size F 80 (coarse crushing .
work input and grindability for the ball mill using the above mentioned system .... equation used by them for the ball mill work index (Bond work index) is as follows. ... an intermediate course in which he postulated n to be 3/2 which leads to. │.
on the alternative evaluation of grindability. Inspired by the VTI method used in the coal industry, which uses porcelain laboratory ball mill and compares material based of oversize particles, a new method was created. The first modification in methodology was the use of a planetary mill instead of a porcelain drum mill.
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ball mill bond work index imvusariskcoza. ball mill bond work index, Relationships Between Bond's Grindability (Gbg) and Breakage One of them is the Hardgrove index, associated mainly with vertical laboratory ball mill under standard conditions, and also the 32 The test of standard ball mill Bond grindability . 24/7 Online
The feed material particle size is generally below 50–100 μm. That is way the reliable mill dimensioning demands the investigation of the grindability of fine materials.