The Bond Ball Mill Grindability Test is a locked cycle laboratory grinding test. It provides the Bond Ball Mill Work Index which expresses the resistance of a material to ball milling. This Index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scale up. The test has existed for more than 40 years.
Ball mills cab be used equally well for wet or dry grinding. In the case of wet grinding the particles are also dispersed in the liquid medium. For temperature sensitive products, ball mills can be fully jacketed to maintain temperatures of the product. Ball mills scale up well and in fact improve in performed with increasing size.
disintegration in the presence of water. The test provides a measure of the ability of the material to withstand degradation in the road base and detects soft aggregate that is subject to weathering. The result of this test is the Wet Ball Mill value. 1.2 The values given in parentheses are not standard and may not be exact
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3 Wet ball mill has a simple transportation device with less auxiliary equipment, so the investment is about 5% 10% lower than that of dry ball mill. 4 The grinding particle size is fine and uniform, and the wet ball milling can not only grind agglomerate into fine particles, but also mix the lean material and the plastic material well.
You also need a rod mill work index to design a ball mill operating on a coarse feed, above about 4 mm. Q1: You design for a typical percentage of critical speed, usually 75% of critical. Then you iterate the mill diameter using a Morrell C model or equation to get the RPM that corresponds to 75% for that mill diameter.
The result of this test is known as the Wet Ball Mill value. Apparatus The following apparatus is required: wet ball mill machine, consisting of a watertight steel cylinder, closed at one end, with inside dimensions of 258.8 ± 3 mm in diameter and 273.1 ± 3 mm in length.
Here is the old Allis Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000 cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250 per cent circulating load.
Ball Mill Design/Power Calculation. The basic parameters used in ball mill design , rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum chunk size, product size as P80 and maximum and finally the type of circuit open/closed you are designing for.
June 10, 2020
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