Where, WioACTis the Actual Operating Bond Work Index (kWh/t), W is the specific energy input (kWh/t), P80 is the 80% passing size of product (µm), and F80 is the 80% passing size of circuit feed (µm). 2. Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3). Wtotal
Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.
The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.
1 Introduction A Bond Ball Mill Work Index test is a standard test for determining the ball mill work index of a sample of ore. It was developed by Fred Bond in 1952 and modified in 1961 ( JKMRC CO., 2006 ).
a simple yet practical alternative for the standard Bond method. Keywords: work index, Bond method, kinetic grinding test, grindability, ball mill Introduction The standard Bond (1952; 1961) method is widely used in the course of design, selection, scale up, energy calculation and performance evaluation of grinding circuits
test using ball-race test mill was performed. Knowing the Hardgrove indices, the Bond work indices of some samples were estimated using the Aplan's formula. The approximate work indices were determined by running a batch dry-grinding test using a laboratory ball mill. Finally, the work indices obtained from both methods were compared.
These are empirical indices determined by closed circuit grindability tests developed by F.C.Bond in the mid 1930's. They require a specific 305mm diameter x 305mm long (inside dimensions) horizontal axis ball mill without lifters operating at 70 rpm to perform grindabilities from 28 to 500 mesh and a 305mm diameter x...
The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is to choose a …
In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwh/t, remaining 6 samples are marked as hard -
The SMC™ test, stored in the "DWT" testwork table (SMC is a Drop Weight Test). Bond ball mill work index. The method requires all the elements of the ball mill work index test to be filled in: Ball mill Wi test closing screen size, umclosing, µm; Ball mill Wi test product size, P 80, µm; Ball mill Wi test feed size, F 80, µm; Ball mill Wi ...
An improved method using less mass compared to the Bond Ball Mill Work Index test. The JK Bond Ball Mill (JKBBM) test, is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size ( passing 3.35 mm) as the Bond Ball Mill Work Index test.
The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill. The simplified test method described in this paper is an alternative procedure to the ball mill grindability test.
Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 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 ...
The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of …
JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test,
Comparison of Bond ball mill work index values obtained by different methods used to conduct the test with Itabirite ore samples. Table 2. Bond ball mill work indices for iron ore samples Sample Bond ball mill work índex – Wib (kWh/t) No removal of fines With removal of fines Itabirite #1 (composite)* 22.4 (7.6) 14.5 (4.9)
by Hazen Research, Inc. (HRI) to obtain the JK parameters using the JK Drop Weight Test, standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below).
Bond Work Index (BWI) Test. Celtest have the capability to carry out the Bond Work Index (BWI) Test in accordance with EPRI Report CS3612 : FGD Chemistry and Analytical Method Handbook, Volume 2 . The BWI is used to estimate the required mill power per ton of product (Specific Energy). The specific energy requirements and the desired production ...
Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].
Abstract: The standard Bond method is the most acceptable method for designing and selecting ball/rod mills described by their b asic parameter called work ind ex ( …
The Bond grindability test is performed in a standard Bond ball mill, dimensions DxL=305x305 mm and a speed revolution of 70 min −1. The mill is filled with balls with a diameter of 15.5 to 30.6 mm, and has a total weight of 20.125 kg. This test uses dry grinding in a closed cycle until a stable circulating load of 250% is established. Bond (1961)
Bond index is useful in designing of grinding system in mineral processing. In this study, the Bond work index of Birnin- Gwari iron ore in northern Nigeria is determined using modified Bond's method using 'reference ore'. Samples of iron ore were sourced using random method, reference minerals; marble and granite of known weight and iron ore of known weight were …
Bond Work Index for Testing Procedure Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done: Add about 500 g of …
Standard Bond Ball Mill Grindability Test Method-Procedure. Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is. Get Price; Test Procedures (100-E Series) dot.state.tx.us. Contact the Soils and Aggregates Section (512) 506-5907 for more information pertaining to the procedures in this series. Get Price
The SMC™ test, stored in the "DWT" testwork table (SMC is a Drop Weight Test). Bond ball mill work index. The method requires all the parameters of the ball mill work index test to be filled in: Ball mill Wi test closing screen size, umclosing, µm; Ball mill Wi test product size, P 80, µm; Ball mill Wi test feed size, F 80, µm
Josefin, Y., Doll, A.G., 2018. Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes. Procemin-Geomet 2018. 14th International Mineral Processing Conference & 5th International Seminar on Geometallurgy, 28-30 November, Santiago, Chile, 1-12.
3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage
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