Impact of Physical Properties and Chemical Composition of Limestone on Decomposition Activation Energy

Abstract

In broad sense definition, the limestone is any rock rich in CaCO3. Limestone can be obtained from a variety of sources and various limestones differ considerably in their chemical compositions and physical structure. The chemical and physical properties of carbonate rocks are interdependent. Physical characteristics of limestone play an important role in evaluating a deposit. Certain physical characteristics in limestones may indicate a general disposition description during calcination. However, all stones with these characteristics will not decrepitate. Limestones display the following attributes or conditions, alone or in combination, are prone to decrepitation; coarse crystallinity, friability, foliation, excessive calcite veining, microfracturing, highly porous and thinly bedded. The chemical reactivity of different limestones shows a large variation due to their differences in crystalline structure and the nature of impurities such as silica, iron, magnesium, manganese, sodium and potassium. Magnesium and ferrous iron cations occurring in limestone may change the carbonate mineralogy of limestone as well as its physical characteristics such as colour, brightness, specific gravity, hardness, tenacity and decomposition properties 1,2 .The main chemical property of limestone is its thermal decomposition, known as calcination, during which lime (CaO) and carbon dioxide are produced (eqn. 1) 1,3 . The calcination process is explained with a partly decomposed piece of carbonate

SAPO‐34 Framework Contraction on Adsorption of Ammonia: A Neutron Scattering Study

“…Zeolites and their related materials have a range of uses from nuclear waste remediation to cat litter and detergents . One major use is catalysis, due to their high surface area, solid acid functionality and the size selectivity conferred by their porous architecture.…”

Kil İçeriği Yüksek Aslantaş Baraj Gölü Çökelti Malzemesinin Seramik Üretiminde Kullanılabilirliğinin Araştırılması

“…Karbonatça zengin killer aynı pişirim koşullarında fırınlandıklarında renkleri krem rengi veya kahverengimsi olur. Karbonatların seramiklerin pişirilmesi sırasındaki etkileri birçok araştırmacı tarafından araştırma konusu olmuştur [9][10][11][12][13][14][15]. Kalsit ve aragonit, aynı kimyasal formülde (CaCO3) olup, atomları farklı yapıda dizilir.…”

“…Kalsit ve aragonit, aynı kimyasal formülde (CaCO3) olup, atomları farklı yapıda dizilir. Her iki mineral de kalsiyum karbonatın iki ayrı kristal şeklidir ve teorik olarak %56 CaO ve %44 CO2 içerir [16]. Özellikle kaba taneli kalsit (>1 mm) pişirim sırasında tamamıyla kalsiyum silikata dönüşmeyebilir.…”

The Effects of Calcination on Mineral Composition and Physical Properties of Limestones and Oyster Shells Derived from Different Sources

“…The local limestone meals are produced from diverse natural carbonate rocks as part of the Bukit Barisan cluster. The mineral composition and macroscopical characteristics of limestones show considerable variations due to their diversity in Calcium (Ca) and Magnesium (Mg) contents, crystalline structure, and natural impurities (Kiliç, 2013). Limestone meal is usually labeled and sold as calcite (CaCO3) and dolomite (CaMg[CO 3 ] 2 ) for agricultural lime and animal feed considering that the ratio of Ca to Mg (MgCO3/CaCO3) varies depending on the type of limestone.…”

“…Calcination is a process through which mineral decomposition and the physical properties of limestones and oyster shells are upgraded using high temperatures (≥ 700°C) in thermal treatment (Kiliç, 2013;Ha et al, 2019). The primary purpose of calcination is to eliminate water and organic matters and convert all or part of the calcium carbonate present into calcium dioxide (CaO, Özer, 2003).…”