Author/Authors :
BAYRAKÇEKEN, Hatice Atatürk Üniversitesi - Mühendislik Fakültesi - Kimya Mühendisliği Bölümü, Turkey , NAKTİYOK, Jale Atatürk Üniversitesi - Mühendislik Fakültesi - Kimya Mühendisligi Bölümü, Turkey , OKUR, Hüseyin Atatürk Üniversitesi - Mühendislik Fakültesi - Kimya Mühendisligi Bölümü, Turkey , ÖZER, A. Kadir Atatürk Üniversitesi - Mühendislik Fakültesi - Kimya Mühendisligi Bölümü, Turkey , GÜLABOĞLU, M. Şahin Atatürk Üniversitesi - Mühendislik Fakültesi - Kimya Mühendisligi Bölümü, Turkey
Abstract :
The kinetics of thermal decomposition of the phosphate rock was studied by means of thermal analysis techniques (TG/DTG) in inert nitrogen (N2) atmosphere at heating rates of 2, 5, 10, and 20 K min^-1. TG and DTG measurements indicated that calcination of the phosphate rock has single-stage degradation in between 873-1173 K. Kissinger–Akahira–Sunose (KAS) and Flynn-Wall-Ozawa (FWO) isoconversional methods were applied to the data obtained from TG and DTG curves and the activation energies were found as 170 ve 187 kJmol^-1, respectively. It was determined that the thermal decomposition mechanism of phosphate rock was occurred via nucleation and growth (-ln(1-α)^2/3) mechanism. Pre-exponentional factor (lnA) was determined as 20.47.
NaturalLanguageKeyword :
Phosphate rock , Isoconversional methods , Activation energy , Non , isothermal kinetic analysis
