The calcination process of limestone mainly includes the pretreatment of limestone and the calcination of limestone:
The calcination process of limestone mainly includes the pretreatment of limestone and the calcination of limestone:
1, limestone pretreatment:
The shape of limestone ore is irregular, itis difficult to meet the requirements of calcination; the particle sizedistribution is wide, it is difficult to ensure the quality of calcination; thehigh impurity content affects the quality of the product, so it is necessary topretreat the limestone that does not meet the standard.
Limestone crushing:
In order to achieve the basic requirementsof the calcining kiln, the limestone must be calcined.
Limestone cleaning:
In order to ensure the quality of theproduct, limestone must be cleaned.
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Rating:
According to the process conditions ofcalcination, there are certain requirements for the particle size of limestone.Therefore, the crushed and cleaned limestone must be classified, and it is notused for other purposes.
Calcination of limestone is a series ofprocesses involving physical and chemical changes. According to these changes,calcination in limestone is divided into three sections: preheating zone,calcination zone and cooling zone.
Preheating area:
The basic chemical reaction in thepreheating zone includes preheating the material temperature to about 900 ° C,evaporating the moisture in the material, decomposing the surface portion ofthe calcium, and completely decomposing the magnesium carbonate.
Calcination zone:
The limestone in the calcination zone iscalcined by the heat released by the combustion of the fuel to decompose thelimestone to produce quicklime.