Flotation responses to the morphological properties of particles measured with three-dimensional approach

Hicyilmaz, C
Ulusoy, U
Bilgen, S
Yekeler, M
Morphological properties of barite particles ground by autogenous and ball milling were examined by three-dimensional methods, namely, Brunauer-Emmett-Teller (BET) nitrogen adsorption and Permaran methods in terms of surface roughness and acuteness, respectively. The experimental study showed that autogenously ground products have lower roughness and acuteness. On the other hand, Hallimond tube flotation tests were performed to evaluate the floatability of those particles ground in different environments. Morphological measurements and flotation tests revealed that particles with smooth surfaces gave better floatability.


Role of shape properties of calcite and barite particles on apparent hydrophobicity
Ulusoy, U; Hicyilmaz, C; Yekeler, M (2004-08-01)
Shape properties of calcite and barite particles ground by ball, rod and autogenous mills were examined by using scanning electron microscope (SEM). Shape properties have been stated in terms of shape descriptors such as elongation ratio, flatness, roundness and relative width by measuring about 200 particles. The results were correlated with the critical surface tension (gamma(c)) of wetting determined by contact angle and micro-flotation methods. The correlations set between the shape properties and the w...
Effect of soft fine particles on the kinetics and energetics of grinding hard coarse particles
Yılmaz, Selim; Hoşten, Çetin; Department of Mining Engineering (2016)
The main objective of this study is to investigate breakage parameters of a narrow size fraction of coarse particles of a hard mineral when ground in a mixture with fine particles of a soft mineral. For this purpose, quartz and calcite were selected as mixture components varying appreciably in hardness (quartz mohs scale:7 and calcite mohs scale:3) but having quite similar densities. Mixture feeds comprised of -1.18+0.85 mm quartz (hard and coarse) and -106 µm calcite (soft and fine) at various proportions ...
Ablation modeling for high speed internal and external flows
Onay, Oğuz Kaan; Eyi, Sinan; Department of Aerospace Engineering (2020)
In this thesis study, the ablation of graphitic materials is modeled and two different analysis tools are developed. In the first model, the computations are conducted with a decoupled approach. Secondly, a more generalized calculation method is introduced via coupling the flow field and solid conduction analysis codes. In the modeling studies, both the gas and solid domains are assumed to be axisymmetric and the physical domains are discretized with structured finite volume cells. For the flow field analys...
Mesoscopic nonequilibrium thermodynamics treatment of the grain boundary thermal grooving induced by the anisotropic surface drift diffusion
Akyildiz, Oncu; ÖREN, ERSİN EMRE; Ogurtani, Tarik Omer (2011-09-01)
A systematic study based on the self-consistent dynamical simulations is presented for the grain boundary thermal grooving problem by strictly following the irreversible thermodynamic theory of surfaces and interfaces with singularities [T. O. Ogurtani, J. Chem. Phys. 124, 144706 (2006)]. This approach furnishes us to have auto-control on the otherwise free-motion of the grain boundary triple junction without presuming any equilibrium dihedral (wetting) angles at the edges. The effects of physicochemical pr...
Cosymmetry preserving finite-difference methods for convection equations in a porous medium
Karasözen, Bülent (2005-09-01)
The finite-difference discretizations for the planar problem of natural convection of incompressible fluid in a porous medium which preserve the cosymmetry property and discrete symmetries are presented. The equations in stream function and temperature are computed using staggered and non-staggered schemes in uniform and nonuniform rectangular grids. (c) 2004 IMACS. Published by Elsevier B.V. All rights reserved.
Citation Formats
C. Hicyilmaz, U. Ulusoy, S. Bilgen, and M. Yekeler, “Flotation responses to the morphological properties of particles measured with three-dimensional approach,” INTERNATIONAL JOURNAL OF MINERAL PROCESSING, pp. 229–236, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67461.