ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
It well known that the operational conditions of rotary kilns affect strongly the quality ofquicklime produced. This work presents a study about parametric optimization of rotary kilns forquicklime production (CaO) from thermal decomposition of calcite limestone (CaCO3). Theapproach used is based on the technique of design of experiments (DOE) to identify the mostsignificant variables which affect the quality of oxide and, in addition, to determine betterconditions of production. An experimental setup in laboratory scale was build in order to carry outthe experiments. Calcination temperature, calcination time, rotation speed, particle mean diameter,heat flow and air flow rate were evaluate using a fractional factorial design. The parametricoptimization shows that the raise of time and temperature of calcinations produces an increase offree CaO terms. However this operation is not useful due to sintering process observed in the BETsurface area results. A correlation between quicklime reactivity and specific surface area could beestablished, in way that reactive quicklimes presented bigger areas. Finally, it was possible todetermine the best conditions of quicklime production and to estimate a quadratic model by using acentral composite design and a like surface response model. It was found that the best region ofoperation is about 900oC and 45 minutes of calcination time
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.811.pdf
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