The Experts below are selected from a list of 225 Experts worldwide ranked by ideXlab platform

Eric Forssberg - One of the best experts on this subject based on the ideXlab platform.

  • influence of Slurry Rheology on stirred media milling of quartzite
    International Journal of Mineral Processing, 2007
    Co-Authors: Eric Forssberg
    Abstract:

    The role of Slurry Rheology in stirred media milling of quartzite has been investigated by varying important grinding parameters such as media bead density and size, addition of chemicals, solids concentration, stirrer rotational speed as well as the combined effect of these factors. Media bead density has an evident but complex effect on stirred milling performance, depending on stirrer rotational speed and solids concentration. The effect of media bead size on the ultra-fine grinding of quartzite is relevant to the feed size. Optimal ratio of media bead size to the median size of a feed is between 150 and 200. The combined effect of grinding bead size and stirrer speed or solids concentration is insignificant. The addition of Dispersant S40 or a lower solids concentration results in better grinding performance (i.e., a higher energy efficiency and a smaller median size) due to the maintenance of lower viscosities at shear rates investigated during grinding. Stirrer rotational speed interacts with solids concentration. For a given solids concentration, an optimal stirrer speed exists. The observed phenomena can be explained by the interaction of Slurry Rheology and the stress intensity of individual grinding bead. In addition, an empirical particle size-energy model provides a good fit (R2 > 0.904) to the grinding results under the experimental conditions investigated. Furthermore, the wear of grinding media beads is involved. ZrO2 beads have a lowest wear rate whereas the wear of SiO2 beads is most serious. The wear rate of Al2O3 beads is related to bead size.

  • parameter effects on wet ultrafine grinding of limestone through Slurry Rheology in a stirred media mill
    Powder Technology, 2006
    Co-Authors: Yanmi Wang, Eric Forssberg
    Abstract:

    Wet ultra-fine grinding of a limestone powder ( 0.991) to the grinding results under the experimental conditions investigated.

  • influence of Slurry Rheology on stirred media milling of limestone
    International Symposium: Advances in Comminution : 26 03 2006 - 29 03 2006, 2006
    Co-Authors: Eric Forssberg
    Abstract:

    This paper reviews the influences of solids concentrations and dispersants with a range of molecular weights on the flowability of limestone slurries as well as the effects on wet ultrafine grindin ...

  • Slurry Rheology in wet ultrafine grinding of industrial minerals: a review
    Powder Technology, 2004
    Co-Authors: Yanmin Wang, Eric Forssberg
    Abstract:

    Wet ultrafine grinding has been increasingly used for production of ultrafine powders in various industries. It has been known that Slurry Rheology significantly influences the grindability of industrial minerals in wet ultrafine grinding. This review represents some previous work with respect to Slurry Rheology in ultrafine grinding. In this review, some methods for the characterization of the Slurry Rheology and some empirical equations modelling rheological behaviours of slurries were presented. The semiempirical model incorporating Slurry Rheology, solids concentration, particle size and Slurry temperature was described. In addition, on-line measurement for the Slurry Rheology control was also discussed. In the case of ultrafine grinding, various parameters (such as solid concentration, particle size and distribution, particle shape, temperature, rotation and pH, use of dispersants), which affect the Slurry Rheology, have been described. It was revealed that the optimization of the rheological behaviours of Slurry in ultrafine grinding could increase throughput, energy efficiency and product fineness as well. It is suggested to further study the mechanisms of Slurry Rheology in the presence of chemical dispersants in wet ultrafine grinding. It is desired to develop a model, which can represent a relation among Slurry Rheology, comminution parameters, amount of dispersant, energy efficiency and particle size characterization.

B C Meikap - One of the best experts on this subject based on the ideXlab platform.

  • application of response surface analysis to iron ore Slurry Rheology using microwave pre treatment
    South African Journal of Chemical Engineering, 2017
    Co-Authors: B K Sahoo, Tapas Das, A Gupta, Milan Carsky, B C Meikap
    Abstract:

    Abstract The present study focused on influence of microwave energy on rheological characterization of iron ore slurries performed in an online Bohlin viscometer. Detailed experimental investigations were carried out for Indian iron ore at high power level (900 W) for all the test samples in microwave oven. The exposure times were fixed at 30, 60, 90 and 120 s. Before and after treatment, the test samples were ground and sieved into different fractions for physical analysis. Central composite design (CCD) was applied to study the influence of particle diameter, solid concentration, microwave (MW) exposure time and shear rate on apparent viscosity for Rheology characteristics of iron ore-water Slurry. A quadratic model was developed for apparent viscosity using sets of experimental data and ANOVA. The model was used to calculate the optimum operating conditions for minimization of apparent viscosity. The apparent viscosity (21.31 mPa.s) produced at these operating conditions showed reasonable agreement with the amounts predicted by the models.

  • an investigation into the influence of microwave energy on iron ore water Slurry Rheology
    Journal of Industrial and Engineering Chemistry, 2015
    Co-Authors: B K Sahoo, B C Meikap
    Abstract:

    Abstract The transporting of slurries in pipelines depends largely on rheological behavior of the solid–liquid suspension. These rheological properties of slurries are very much influenced by the Slurry concentration, particle size distribution and, surface characteristics. The present invention is concerned with the effect of these parameters on Slurry Rheology using microwave (MW) energy. Microwave pre-treatment for rheological behaviour of iron ore-water slurries (IWS) were carried out in an online Bohlin viscometer. Detailed experimental work for Indian iron ore were conducted at power level of 900 W and 30, 60, 90 and 120 s various exposure times in microwave oven. The microwave treated and untreated test samples were ground for rheological characteristic of slurries. It was seen that microwave-treated ore have better rheological properties as compared to untreated ore. This type of Slurry is shear thinning and easy to transport as it exhibited pseudo-plastic behavior. The result showed that microwave-treated iron ore have a density lower than that of untreated ore after grinding. Statistical design analysis was employed to develop empirical equations and found to be encouraging and highly considerable.

B K Sahoo - One of the best experts on this subject based on the ideXlab platform.

  • application of response surface analysis to iron ore Slurry Rheology using microwave pre treatment
    South African Journal of Chemical Engineering, 2017
    Co-Authors: B K Sahoo, Tapas Das, A Gupta, Milan Carsky, B C Meikap
    Abstract:

    Abstract The present study focused on influence of microwave energy on rheological characterization of iron ore slurries performed in an online Bohlin viscometer. Detailed experimental investigations were carried out for Indian iron ore at high power level (900 W) for all the test samples in microwave oven. The exposure times were fixed at 30, 60, 90 and 120 s. Before and after treatment, the test samples were ground and sieved into different fractions for physical analysis. Central composite design (CCD) was applied to study the influence of particle diameter, solid concentration, microwave (MW) exposure time and shear rate on apparent viscosity for Rheology characteristics of iron ore-water Slurry. A quadratic model was developed for apparent viscosity using sets of experimental data and ANOVA. The model was used to calculate the optimum operating conditions for minimization of apparent viscosity. The apparent viscosity (21.31 mPa.s) produced at these operating conditions showed reasonable agreement with the amounts predicted by the models.

  • an investigation into the influence of microwave energy on iron ore water Slurry Rheology
    Journal of Industrial and Engineering Chemistry, 2015
    Co-Authors: B K Sahoo, B C Meikap
    Abstract:

    Abstract The transporting of slurries in pipelines depends largely on rheological behavior of the solid–liquid suspension. These rheological properties of slurries are very much influenced by the Slurry concentration, particle size distribution and, surface characteristics. The present invention is concerned with the effect of these parameters on Slurry Rheology using microwave (MW) energy. Microwave pre-treatment for rheological behaviour of iron ore-water slurries (IWS) were carried out in an online Bohlin viscometer. Detailed experimental work for Indian iron ore were conducted at power level of 900 W and 30, 60, 90 and 120 s various exposure times in microwave oven. The microwave treated and untreated test samples were ground for rheological characteristic of slurries. It was seen that microwave-treated ore have better rheological properties as compared to untreated ore. This type of Slurry is shear thinning and easy to transport as it exhibited pseudo-plastic behavior. The result showed that microwave-treated iron ore have a density lower than that of untreated ore after grinding. Statistical design analysis was employed to develop empirical equations and found to be encouraging and highly considerable.

Narasimha Mangadoddy - One of the best experts on this subject based on the ideXlab platform.

  • development of novel hydrocyclone designs for improved fines classification using multiphase cfd model
    Separation and Purification Technology, 2017
    Co-Authors: Teja Reddy Vakamalla, Veera Bhadra Rao Koruprolu, Rakesh Arugonda, Narasimha Mangadoddy
    Abstract:

    Abstract In this paper, a set of potential hydrocyclone designs are explored for fines classification using Computational Fluid Dynamics (CFD) technique. The CFD model uses Volume of Fluid multiphase model coupled with Reynolds Stress turbulence model for two phase flow predictions. Lagrangian Particle Tracking and Algebraic Slip Mixture model (ASM) modified with shear lift forces and Slurry Rheology corrected with fines fraction are used to predict the particle classification. Conventional cylindrical-conical design and various novel cyclone designs having a combination of multiple and small cone angles, tapered vortex finder and air core free designs are considered in this study. Simulation results are presented in terms of mean and turbulent flow field along with particle efficiency curve. Predictions show that all the tested novel designs are inherently having the potential for finer cut separation and higher tangential velocity compared to the conventional design. Cyclone design with a small cone angle is further modified by placing various sizes of rods at the center axis of the cyclone. Multiphase simulations with modified ASM model are also carried out for the multiple cone angles design, standard design, and the modified small cone angle design with full length rod at 15 wt% of solids. Performance by multiphase simulations show that multiple cone angles design and modified small cone angle design with the full length rod are the best among the tested designs yielding high separation efficiency, smaller cut-point and minimum coarse particle misplacement due to resultant turbulence minimization.

Yanmi Wang - One of the best experts on this subject based on the ideXlab platform.