A New Approach to the Calculation of Work Index and the Potential ... The work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a .... using a novel ring mill, a laboratory ball mill, a labora-.
This test determines the Bond Ball Mill Work Index, which can be used with Bond's Third Theory of Comminution to calculate net power requirements for sizing ball mills. The test is a closed-circuit, dry grindability test is run in a standard ball mill, and can be performed at sizes ranging from 595 mm to 37 microns. The normal finishing size is 149 microns.
This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.
Bond Ball Mill Index Test (BRMWI) A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. The BBMWI is a measure of the resistance of the material to crushing and grinding.
W is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers.
produce a specified tonnage and the power requirement for grinding. Detailed prediction of grinding rate and product size distribution from mills await the development of a simulation based on physics of fracture. N. Magdalinovic  has stated simplified procedure for a rapid determination of the work index by just two grinding tests. The applicability of the simplified procedure has been ...
XMGQ work index ball mill is specially and mainly used to determine the work index of grinding of ores, slag, and other materials. The product is produced by the only enterprise designated by the former Ministry of Geology and Mineral Resources, in compliance with the industrial standards.
The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using Bond's standard mill design. The locked-cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250% recirculating load. The mill product from each cycle is screened and the ...
using a novel ring mill, a laboratory ball mill, a labora- tory rod mill and the semi continuous process using the same rod mill as described below. In all cases the min- eral sample is crushed and screened to pass a predeter- mined size 3.5 or 4 mm. The feed sample undergoes a wet screen analysis and a certain quantity, usually 0.5 - 1.0 kg, is used at each grinding test. The grinding prod ...
1. Introduction. Ball mills are usually the largest energy consumers within a mineral concentrator. Therefore, an efficient use has a great impact on performance and cost implications.
When the Bond Rod Mill Work Index is used instead of the SAGDesign measurement, the Rod Mill Wi variability graph will look more like Figure 2 (McKen et al., 2006) than Figure 1 because the Rod Mill Wi test is done in an even heavier steel environment than the Ball Mill Wi test.
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 µm. Adjustment of grinding parameters:
LAB/PILOT PLANT EQUIPMENT. Bond Ball Mill. This 12" x 12" ball mill is universally used for grindability testing and determination of the Bond Work Index.
Abstract Research was performed to make a comparison using work bond index results between two laboratory ball mills, each of a different design.
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Similar to a Comparative Work Index, this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time. It can be used at mesh sizes from 65 to 200 mesh (normally 100 mesh). The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index. It is used to show the orebody hardness profile and to predict ...
Note that the Bond ball work index test should be carried out with a closing screen size which gives a final product P80 similar to that intended for the full scale circuit. Conventional Crushers
In ball mills, steel balls or hard pebbles to break particle based on impact and attrition. A rotating mill charged with media and ore is lifted against the inside perimeter. Some of the media falls and impacts the ore particles at the bottom of the mill.
Description. XMGQ work index ball mill is specially and mainly used to determine the work index of grinding of ores, slag, and other materials. The product is produced by the only enterprise designated by the former Ministry of Geology and Mineral Resources, in compliance with the industrial standards.
Flowsheet – Sizing Testwork, Crushing <3.35 mm, Bond Ball Mill Work Index Determination Figure 1B MHT004 – Mt Todd Deep U/G Gold Ore Test Program Flowsheet –
Our combined experience in ball mill design and process equipment development totals more than 60 years and allows us to put a unique spin on steel and lined mills. Particle size reduction of materials in a ball mill with the presence of metallic balls or other media dates back to the late 1800's.
Relationships between comminution J energy and product . 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 ...
This ball mill, also called mill for measuring bond work index, is a key device for measuring grinding work index. It is widely used by teaching and researching departments for grindability test of cement raw materials and mixtures.
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 to 100 um.
The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals.
mills with the rod mill and ball mill laboratory work indices. Note, in Figure. 1, that the rod mill product slope is less than 0.5 due to an extra amount of nes present being ﬁ ﬁ ner than
Bond Ball Mill Work Index (and modified Bond Work Index) data can be used in the CEET® grinding simulator. • The Bond Rod Mill Grindability Test determines the Bond Rod Mill Work Index which is used to determine net power requirements for sizing rod mills. The test is a closed circuit, dry grindability test, run in a standard rod mill. It can be performed at mesh sizes ranging from 4 mesh ...
The world widely relies on the ball mill work index for the design and analysis of ball mill circuits, even those that treat AG/SAG mill or HPGR circuit products, …