Türker, Burhan Lemi
The effects of phenols on hydrochloric acid leaching of metal oxides is investigated theoretically. A mathematical model is developed for the early stages of leaching assuming that steady state conditions and Fick's first law are valid for the formation and diffusion of metal cations through the Helmholtz-Stern interface. It is found theoretically that the leaching rate is exponentially proportional to acid and phenol concentrations and any metal-phenol complex which can be decomposed by chloride ions should considerably increase the leaching rate by playing a role of active transport. Otherwise, phenols are expected to have a synergistic effect on the hydrochloric acid leaching of metal oxides. The validity of this theoretical approach is checked by examining the effect of phenol and resorcinol on HCl-CH3OH and HCl-C2H5OH leaching of ilmenite at 3 M HCl concentration. The mathematical model is verified by regression analysis of the data collected.


Effect of carbonate alkalinity on flotation behavior of quartz
Sayilgan, A; Arol, Ali İhsan (Elsevier BV, 2004-11-19)
Alkalinity is defined as the capacity of a water to neutralize strong acids. In natural waters, this capacity is generally attributable to bases such as HCO3-, CO32 and OH- as well as to species often present in small concentrations such as silicates, borates, ammonia, phosphates and organic bases. Carbonate alkalinity of process waters in mineral processing may change as a result of the seasonal climatic changes, the fresh water source and the amount of recycled process water. Any mineral processing plants...
Effect of heat treatment on grindabilities of celestite and gypsum and separation of heated mixture by differential grinding
Sener, S; Bilgen, S; Ozbayoglu, G (Elsevier BV, 2004-03-01)
This study was conducted to determine thermal decomposition of gypsum (CaSO4 . 2H(2)O) and celestite (SrSO4), to examine the effect of heating on grindability and the possibility of celestite-gypsum separation by differential grinding after heating. The results indicated that no significant decomposition reaction was observed in celestite up to 900 degreesC whereas the decomposition of gypsum occurred within 100-450 degreesC.
The dissolution of ilmenite in HClH2O, HClCH3OH and HClC2H5OH systems — A theoretical approach
Türker, Lemi; Goodall, David; Girgin, İsmail (Elsevier BV, 1988-11)
Silicon powders are obtained by laser pyrolysis of silane gas. Temperature and velocity profiles are determined both theoretically and experimentally. The velocimetry consists of a marker technique which measures the propagation time of a perturbation front through the hot reaction zone. In the theoretical model, the coaxial jet expansion undergoing a thermal heating is studied by defining a Dorodnitzin-Illingworth transformation. The results show a decrease of axial velocity as the gas enters the laser hea...
Effect of inlet pressure on crude oil combustion -laboratory approach-
Kök, Mustafa Verşan; Nurgaliev, Danis K. (Elsevier BV, 2021-03-01)
In this research, the effect of inlet pressure on combustion behavior of medium and light crude oils was analyzed with TGA and DSC experiments. The ramped temperature combustion experiments were performed at constant heating rates under air atmosphere. TGA curves revealed three main reaction regions known as low temperature oxidation (LTO), fuel deposition (FD), and high temperature oxidation (HTO). In DSC curves, at the early stage of the heating, distillation region was also observed in addition to LTO an...
The effects of feed size distribution on confined-bed comminution of quartz and calcite in piston-die press
Hoşten, Çetin; Cimilli, H. (Elsevier BV, 2009-05-16)
Packing characteristics of particle beds, determined mainly by the particle size distribution, exert a critical influence on the interparticle breakage of minerals in confined beds under compression. This paper is concerned with the effects of feed size distribution on characteristic phenomena of confined-bed comminution. Minus 3.35-mm quartz and calcite feeds were prepared by proportionately mixing previously classified narrow-size fractions so as to construct particle size distributions having the Gaudin-...
Citation Formats
I. GIRGIN, B. L. Türker, and D. GOODALL, “EFFECT OF PHENOL AND RESORCINOL ON LEACHING OF ILMENITE WITH HCL-CH3OH AND HCL-C2H5OH SOLUTIONS,” INTERNATIONAL JOURNAL OF MINERAL PROCESSING, pp. 147–159, 1991, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62761.