(4%-ร้อยละ 85 97 ของจุดบอด ) Magnesite ( ตาย

Brand HY87 HY89 HY90 HY91 HY92 HY93 HY94 HY95 HY96 HY97
LOI%(max) 0.7 0.7 0.5 0.5 0.5 0.5 0.35 0.3 0.3 0.3
SiO2%(max) 7.0 5.5 4.0 3.8 3.5 3.0 2.5 2.2 1.8 0.7
Fe2O3%(max) 2.0 2.0 1.6 1.5 1.4 1.2 1.5 1.0 0.8 0.7
Al2O3%(max) 1.7 1.6 1.4 1.2 1.0 0.8 1.5 1.0 0.8 0.3
CaO%(max) 3.0 2.5 2.5 2.4 2.3 2.0 2.2 1.6 1.8 1.4
MgO%(min) 87.0 89.0 90.0 91.0 92.0 93.0 94.0 95.0 96.0 97.0
BD g/cm3(min) 3.1 3.15 3.15 3.15 3.15 3.18 3.20 3.20 3.20 3.28

Dead burned magnesite is made from selected raw magnesite through sintering in shaft kilns at high temperature. It is the idial material for making magnesia monolithic refractories that are used in the bottom of open-hearth furnace or electric arch furnace or rammed as lining of the furnaces.