The Experts below are selected from a list of 2421 Experts worldwide ranked by ideXlab platform

Tatsuo Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • analysis of energy size reduction relationships in batch tumbling ball mills
    Powder Technology, 2011
    Co-Authors: S. Nomura, Tatsuo Tanaka
    Abstract:

    Abstract A theoretical energy–size reduction relationship is derived for tumbling ball mills based on a solution of the integro-differential equation of comminution kinetics, in which the proportional relationship is applied between the grinding rate constant and the net mill power. The derived formula is similar to an empirical energy law, d W ∝ d x r / x r i , where W is the specific energy input, x r is the particle size of product and the exponent i is shown to be a variable depending upon the ground material, the type of mill and the method to measure energy. Derived results are confirmed with reported data in reasonable agreement. Also, the Bond's energy law is examined and a method for the correction of the Bond Work Index is discussed.

  • Analysis of energy–size reduction relationships in batch tumbling ball mills
    Powder Technology, 2011
    Co-Authors: S. Nomura, Tatsuo Tanaka
    Abstract:

    Abstract A theoretical energy–size reduction relationship is derived for tumbling ball mills based on a solution of the integro-differential equation of comminution kinetics, in which the proportional relationship is applied between the grinding rate constant and the net mill power. The derived formula is similar to an empirical energy law, d W ∝ d x r / x r i , where W is the specific energy input, x r is the particle size of product and the exponent i is shown to be a variable depending upon the ground material, the type of mill and the method to measure energy. Derived results are confirmed with reported data in reasonable agreement. Also, the Bond's energy law is examined and a method for the correction of the Bond Work Index is discussed.

Nedeljko Magdalinovic - One of the best experts on this subject based on the ideXlab platform.

  • Determination of the Bond Work Index on samples of non-standard size
    International Journal of Mineral Processing, 2012
    Co-Authors: Nedeljko Magdalinovic, Milan Trumić, Goran Trumic, Srdjana Magdalinovic, Maja Trumic
    Abstract:

    Abstract The Bond Work Index, Wi, is defined in a Bond ball mill on the samples of standard size − 3.327 + 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm. In this Work, a procedure for the calculation of the Bond Work Index is suggested for cases when the Bond grindability test is conducted on samples of non-standard size.

  • Calculation of energy required for grinding in a ball mill
    International Journal of Mineral Processing, 2003
    Co-Authors: Nedeljko Magdalinovic
    Abstract:

    Abstract The Bond Work Index, Wi, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product. Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given size of grinding product, the value of the Work Index Wi, which is determined by experiments, is not known. This problem is considered in this paper and some solutions are put forward. Experiments were made on copper ore, andesite and limestone, and it was found that the change of the mass passing a test screen G could be related to the aperture size Pk of the screen by the formula: G=K 1 P k . The grinding-product size, P, in a Bond ball mill, which is given by the aperture size which passes 80% of the grinding product as a function of the aperture size of the test screen Pk, can be expressed by the formula P= P k K 2 . These functions for G and P enable us to calculate the value of Wi for any other size of grinding product if we know the Work Index Wi and aperture size of the screen Pk.

  • Abbreviated test for quick determination of Bond’s Work Index
    2003
    Co-Authors: Nedeljko Magdalinovic
    Abstract:

    The grindability of an ore in the process of mineral dressing can be determined by use of the Bond Work Index (Wi). This Index is determined on a laboratory scale using a Bond ballmill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained. This happens only after 7-10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the Work Index by just three grinding tests. The applicability of the simplified procedure has been proved on samples of copper ore, andesite and bauxite.

  • abbreviated test for quick determination of Bond s Work Index
    Journal of Mining and Metallurgy A: Mining, 2003
    Co-Authors: Nedeljko Magdalinovic
    Abstract:

    The grindability of an ore in the process of mineral dressing can be determined by use of the Bond Work Index (Wi). This Index is determined on a laboratory scale using a Bond ballmill and by simulating dry grinding in a closed circuit until the 250% circulating load has been obtained. This happens only after 7-10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the Work Index by just three grinding tests. The applicability of the simplified procedure has been proved on samples of copper ore, andesite and bauxite.

R Ahmadi - One of the best experts on this subject based on the ideXlab platform.

  • rapid determination of Bond rod mill Work Index by modeling the grinding kinetics
    Advanced Powder Technology, 2013
    Co-Authors: R Ahmadi, M Hashemzadehfini, Amiri M Paria
    Abstract:

    Abstract 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 the conventional Bond Work Index. The grinding experiments were carried out on four typical samples of iron, copper, manganese and lead–zinc ore with three test-sieves in specified time periods and aimed to shortening the procedure. Furthermore, the grinding kinetics and mass balance equations were applied to model the standard Bond rod-mill Work Index. For comparing the standard Bond rod-mill Work Index and the new modeled method, Work Index ( W i ) and produced fine particles in a cycle ( G i ) for the four samples determined. The performed paired Student’s t -test results indicated that the Standard Deviation for G i and W i obtained by the shortened method are respectively 0.50 and 0.58 in respect of traditional Bond method.

  • Procedure for determination of ball Bond Work Index in the commercial operations
    Minerals Engineering, 2008
    Co-Authors: R Ahmadi, S H Shahsavari
    Abstract:

    Abstract 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 material to ball milling. This happens after 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the Work Index by just two grinding tests. The applicability of the simplified procedure has been proved on samples of copper and Iron ores that are located in Iran. The values obtained by this procedure do not differ by more than 7% from those obtained in the standard Bond test.

S. Nomura - One of the best experts on this subject based on the ideXlab platform.

  • analysis of energy size reduction relationships in batch tumbling ball mills
    Powder Technology, 2011
    Co-Authors: S. Nomura, Tatsuo Tanaka
    Abstract:

    Abstract A theoretical energy–size reduction relationship is derived for tumbling ball mills based on a solution of the integro-differential equation of comminution kinetics, in which the proportional relationship is applied between the grinding rate constant and the net mill power. The derived formula is similar to an empirical energy law, d W ∝ d x r / x r i , where W is the specific energy input, x r is the particle size of product and the exponent i is shown to be a variable depending upon the ground material, the type of mill and the method to measure energy. Derived results are confirmed with reported data in reasonable agreement. Also, the Bond's energy law is examined and a method for the correction of the Bond Work Index is discussed.

  • Analysis of energy–size reduction relationships in batch tumbling ball mills
    Powder Technology, 2011
    Co-Authors: S. Nomura, Tatsuo Tanaka
    Abstract:

    Abstract A theoretical energy–size reduction relationship is derived for tumbling ball mills based on a solution of the integro-differential equation of comminution kinetics, in which the proportional relationship is applied between the grinding rate constant and the net mill power. The derived formula is similar to an empirical energy law, d W ∝ d x r / x r i , where W is the specific energy input, x r is the particle size of product and the exponent i is shown to be a variable depending upon the ground material, the type of mill and the method to measure energy. Derived results are confirmed with reported data in reasonable agreement. Also, the Bond's energy law is examined and a method for the correction of the Bond Work Index is discussed.

Amiri M Paria - One of the best experts on this subject based on the ideXlab platform.

  • rapid determination of Bond rod mill Work Index by modeling the grinding kinetics
    Advanced Powder Technology, 2013
    Co-Authors: R Ahmadi, M Hashemzadehfini, Amiri M Paria
    Abstract:

    Abstract 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 the conventional Bond Work Index. The grinding experiments were carried out on four typical samples of iron, copper, manganese and lead–zinc ore with three test-sieves in specified time periods and aimed to shortening the procedure. Furthermore, the grinding kinetics and mass balance equations were applied to model the standard Bond rod-mill Work Index. For comparing the standard Bond rod-mill Work Index and the new modeled method, Work Index ( W i ) and produced fine particles in a cycle ( G i ) for the four samples determined. The performed paired Student’s t -test results indicated that the Standard Deviation for G i and W i obtained by the shortened method are respectively 0.50 and 0.58 in respect of traditional Bond method.