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Journals / Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi / 2014 / Cilt: 20 - Sayı: 7

Non-Isothermal Calcination Kinetics of Phosphate Rock

Fosfat Kayasının İzotermal Olmayan Bozunma Kinetiği

Hatice BAYRAKÇEKEN
Jale NAKTİYOK
Hüseyin OKUR
A. Kadir ÖZER
M. Şahin GÜLABOĞLU
Pages
266–271
Publication Date
2014-07-01
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Pre-exponentional factor (lnA) was determined as 20.47.

📌 3 Key Takeaways

🎯
Objective & Hypothesis: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.
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Key Findings & Data:TG and DTG measurements indicated that calcination of the phosphate rock has single-stage degradation in between 873-1173 K.
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Conclusion & Impact:Pre-exponentional factor (lnA) was determined as 20.47.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Fosfat kayası · Eş dönüşüm metotları · Aktivasyon enerjisi

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.

Özet

Mazıdağı fosfat kayasının inert ( N2) ortamda ısıl bozunma kinetiği 2, 5, 10 ve 20 K dak-1 ısıtma hızlarında termal analiz teknikleri (TG/DTG) ile incelendi. TG ve DTG ölçümlerinde 873-1173 K sıcaklık aralığında fosfat kayasının ısıl bozunmasının tek basamaklı bozunma olduğu görüldü. TG ve DTG eğrilerinden elde edilen verilere eş dönüşüm metotları Kissinger–Akahira–Sunose (KAS) ve Flynn-Wall-Ozawa (FWO)uygulanarak aktivasyon enerjileri sırasıyla 170 ve 187 kJmol-1 olarak bulundu. Fosfat kayasının ısıl bozunmasının çekirdeklenme ve büyüme (-ln(1-α)2/3) mekanizmasına göre meydana geldiği belirlendi. Ön üssel faktör (ln A) ise 20.47 olarak tespit edildi.

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Cite This Article

BAYRAKÇEKEN, H., NAKTİYOK, J., OKUR, H., ÖZER, A. K., GÜLABOĞLU, M. Ş. (2014). Non-Isothermal Calcination Kinetics of Phosphate Rock. Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi, Cilt: 20 - Sayı: 7, 266–271. https://ajindex.com/articles/42724

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