Abstract: High activity lime plays an important role in energy conservation and emission
reduction，as well as in peak carbon emissions and carbon neutrality. Since the current active lime
has been found difficult to meet the requirements，increasingly more importance is being attached
to the production technology of high activity lime. This paper analyzes the characteristics of the
limestones from the Wuhai Hainan Mining Company of Baotou Steel Group and researches the
process technology for preparing high activity lime. The research results show that the limestones
from the mining company mainly include calcite，dolomite，quartz and iron minerals，and their
decomposition characteristics are greatly related to their particle size. This type of limestone can be
used to calcine highly active lime，especially，the limestones with a particle size of 0.125 ～ 0.63
mm at a calcination temperature of 1 000 ～ 1 050 ℃ for 30 ～ 40 minutes. The highly active lime
calcined under those conditions features fine grains，multiple pores，and high activity.

Key words: Lmestone, High activity lime, Calcium oxide, Calcination