Abstract: With magnesium and calcium sand and silicon powder as raw materials and organic
modified powder as additive，castor oil and new organic liquid binder were used to prepare AOD
refining furnace bottom，and study the influences of different binders on magnesia-calcium
ramming material performance. The test results show that the ramming materials prepared by new
organic liquid binder has better physical properties after heat treatment at 280 ℃，1 000 ℃ and 1 500 ℃ .
The results show that the magnesia-calcium ramming material prepared by new organic liquid agent
is used in 90 t AOD refining furnace of a steel mill，and its service life reaches 85 heats. MgOCaO
ramming material is smokeless，environment-friendly and high strength, which can meet the
use requirements of steel mills.

Key words: AOD refining furnace, Ramming material, Binder, Mechanical properties