Abstract
This study aimed to analyze the advantages of limestone calcination through a conventional microwave heating technique. For such a purpose, the microwave was merged by hybrid heating and a refractory ceramic internally coated with copper oxide was used with a conventional muffle furnace. It has also been analyzed the behavior of calcining limestone with different masses and variations in retention time using a muffle furnace and microwaves, both with and without using the refractory ceramic. Afterwards, the process has been modeled so as to analyze temperature versus retention time. As a result, calcination using a microwave susceptor with the refractory ceramic substance proved to be a process that takes 35% less time than conventional methods. Furthermore, there has been a reduction in 66.1% of energy expenditure. It was also observed that the new procedure offers advantages in reduced greenhouse gases emissions on account of the release of only a single substance, ease of air treatment in industrial environments and being a more economically viable process for limestone calcination, which can be further utilized by companies belonging to such a sector. Its patent deposit number BR 202018073002-4 U2 in INPI.
Highlights
In the context of world economy, quicklime is among the ten most widely used mineral products
This paper has presented an analysis of the calcination process of limestone to obtain lime by comparing the energy, economic and environmental efficiency of use a microwave oven in the process
The calcination process using the microwave oven through which it was observed that limestone calcination through a microwave provides the best results in terms of reaction time, energy consumption and emission of polluting gases
Summary
In the context of world economy, quicklime is among the ten most widely used mineral products. As it is a product that has been widely used in various sectors of the economy, its consumption is directly due to countries development. Calcination is an endothermic reaction which uses coal combustion in a rotary kiln to achieve desired temperatures in conventional processes. This heating process is environmentally unfriendly and consumes an excessive amount of energy. Microwave hybrid heating has been proposed to increase limestone temperature to desired levels. It is a phenomenon used in modern industrial applications whose advantages are numerous, such as: time and energy savings, extremely fast heating rates, enhanced mechanical properties and considerably reduced processing time, (Hartlieb, 2016)
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