THERMAL SHOCK RESISTANT MAGNESITE BRICKS AND A PROCESS FOR PREPARATION OF THERMAL SHOCK RESISTANT MAGNESITE BRICKS

摘要

ABSTRACT The invention in general relates to a Tliermal Shock Resistant Magnesite Bricks and a process of preparation of thermal shock resistant magnesite bricks which can be used in steel making furnaces, cement rotary kilns, glass melting furnaces, non-ferrous metal production etc. This invention provide a controlled process of preparation of magnesite bricks with high thermal shock resistance under high operating temperature having no disposal problem and without any environmental hazards. This process of preparation of magnesite brick consists of preparation of Dead Burnt Magnesite powder(DBM), and mixing of said DBM with additives and binders like Magnesium Sulphate or Mono-Aluminium phosphate - commercial grades in the preferred ratios. The quality of Additives, Binders and Dead Burnt Magnesites are tested prior to mixing. The DBM peas are crushed and graded into fine fractions of powder in the closed Mill House circuit and thereafter drawn into the IMT Counter current mixer through the load cell where it is mixed with desired quantities of additives, binders and water for a fixed duration. Then the mix is then shaped into bricks with programmable Hydraulic Friction Screw Press and then the bricks are dried at 150*c in Kilns and preheated gradually and fired at high temperature in accordance with pre-determined firing profile and then cooled at 100 °c. Then the bricks are then subjected to physical tests in order to attain the required physical and mechanical properties. These bricks are widely used in the sintering transition zones of Cement rotary kiln.