Research To Prevent The Rehydration Of Lime

As users improve the quality of steel, steel refining technology has been more attention. Steel refining process of molten steel refining slag off P de S and impact, and steel S, P content has a direct impact on the quality of steel. Molten steel refining process requires S and P slag refining of high alkalinity, although adding lime can be used to improve the refining slag basicity, but the lime high melting point (2600℃) in the steel refining temperature range (1600 to 1700℃) within the melt slowly, in the steel refining cycle, can not fully play its role. Lime using lime powder can speed up the process of refining in the steel melting rate, but the powder of lime easy to hydrate, and powder easy to drift in the course of the formation of on-site pollution hanging.So this paper, the current refining molten slag is slow and the main component of calcium oxide in the air of deterioration of the shortcomings to hydrate, its experimental study. Of calcium oxide powder surface carbonation process, the formation of a layer of calcium carbonate on the surface protective film. Finally, calcium oxide powder obtained by experiments at 700 degrees temperature, water bath temperature of 40 degrees, the amount of carbon dioxide leads by 2.5L/min, ventilation for 30 minutes under the conditions of passivation best. At last, lime passivation experimental research, the specific reference to the current production of lime, made use of lime kiln lime production emissions of carbon dioxide surface passivation of the production process. Finally, the passivation over the lime powder and then mixed with fluorite flux into the refining slag powder to wet or dry ball into the steel refining process to achieve the granularity required.