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Yogita Ingle 4 years, 7 months ago
As per the popular definition, calcination is defined as the process of converting an ore into an oxide by heating it strongly. The ore is heated below its melting point either in absence of air or in a limited supply. This method is commonly used for converting carbonates and hydroxides to their respective oxides. During calcination, moisture and volatile impurities are also removed. Calcination can also be described as a thermal process that is used to convert ores and other solid materials by bringing about thermal decomposition. In calcination, reaction most of the time occurs at or above the thermal decomposition temperature.
Calcination is derived from a Latin word calcinare which translates as “to burn lime”. So, calcination is mostly used in the decomposition of limestone (calcium carbonate) to lime (calcium oxide) and carbon dioxide.
CaCo3 —> CaO + CO2
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Gaurav Seth 4 years, 8 months ago
कवयित्री कहती है कि मनुष्य को भोग विलास में पड़कर कुछ भी प्राप्त होने वाला नहीं है। प्रस्तुत पंक्तियों में कवयित्री मनुष्य को ईश्वर प्राप्ति के लिए मध्यम मार्ग अपनाने को कह रही है।मनुष्य जब सांसारिक भोगों को पूरी तरह से त्याग देता है तब उसके मन में अंहकार की भावना पैदा हो जाती है। अत:भोग-त्याग, सुख-दुःख के मध्य का मार्ग अपनाने की बात यहाँ पर कवयित्री कर रही है। भाव यह की भूखे रहकर तू ईश्वर साधना नहीं कर सकता।
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