PROCESSO DE CALCINAÇÃO DA CAL CALCÍTICO EM FORNOS MAERZ

Abstract

A study was carried out on the production of calcitic lime in Maerz kilns through calcination of calcium carbonate. There are several models of kilns that are used to carry out the calcination process, the specific study carried out was in Maerz type vertical kilns. The main features of this model are its efficiency, which can reach up to 35% higher in terms of low costs, and the possibility of working with limestone (CaCO3) where an extensive range of granules can be used. Limestone changes its characteristics as a function of the mine's decomposition levels, and according to the exploration bench there is a change in the physical and chemical characteristics of the material, which affects the rate of thermal decomposition of CaCO3. In the process, LDG fuel was used in the furnace under study. LDG is a gas coming from the blowing of converters in the melt shop of a steel plant, the characteristics of LDG are its low calorific value, its large concentration of inert gas and its constant quality variation, the furnace referred to in the process is from Maerz manufacturer, it has a continuous production process with batch feed, its shutdown for long periods regardless of the reason leads to a large thermal loss which will affect the quality of the material later, so operational availability is extremely important