1. The difference of effects of burnt lime and hydrated lime, raw gypsum and burnt gypsum on white cement was studied, and the optimal type of lime and gypsum was determined.

2. A new type of burnt lime slaker have been developed by LAIGANG sintering plant.

3. The study result shows that proportioning of burnt lime in sinter mix is a effective measure for sinter production increasing, and the sinter quality and metallurgical properties were less affected.

4. Fluxes (burnt lime or dolomite )are fed into the vessel to form slag which absorbs impurities of the steelmaking process .

5. As there are many shortages exist in old type of burnt lime hydrator, so three modified burnt lime hydrators were presented in this paper.