Active lime is an important auxiliary material in steel making industry.It's widely used in Al2O3 production, steel production, calcium carbide , Metal Mg production and Power plant desulfurization paper production area.As proved in production, the using of active lime in steel making industry is very profitable. The using of active lime enhances the steel making industry quality and capacity , lower down the loss and cost, and it is stabilizes the operation.The Chaeng(Great Wall Machinery) can provide complete equipments for active lime production line.

Working Principle

The limestone in the pre-heater is heated to around 900 ° C by the kiln  flue gas of 1150 ° C. At this time, about 30% of the limestone has been  decomposition. Then the limestone is put into the rotary kiln by the hydraulic  stem. Sinters and decomposes into CaO and CO2 in the rotary kiln the limestone .  It is cooled to about 100 ° C in the cold air before the decomposed limestone  goes into the cooler . The 600 ° C hot air after heat exchange goes into the  kiln and combusts with gas. The Exhaust gas blended with the cold wind go to the  bag filter through the suction fan and then through the exhaust fan into the  chimney.

Advantage of active lime line

1.Steelmaking practice proved that, the active lime can improve 80% the  desulfurization and dephosphorization efficiency , and reduce the smelting time.  It also can be completely take reaction in the molten steel with acidic  substances in 3-5 minutes.The lime reaction time at least need 6-10 minutes in  shaft kiln . It also increase furnace ridge above 40%. The furnace burden  consumption is reduced to 5-8kg/t steel,savings annual about 15000000,production  efficiency is significant.

2.Active lime is obviously improved for desulfurization and  dephosphorization efficiency ,the average steel removal rate of is 34.5%  ,especially for high S iron (S ≥ 0.06%), and the S removal agent consumption can  be decrease by about 45%.

3.Steelmaking can use active lime,iron material consumption can be decrease  5-15Kg/t steel,than non-active lime . And it also can reduce the steel splash  and adhesion on oxygen lance;sticky mouth;flue sticking phenomenon.

4.Lime use level reduced: steelmaking use active lime, the consumption can  reduce 20~25kg/t steel,compared with non-active lime . But if use non-active  lime,use level is more than 65~70kg,if use active lime, is 40~41.5kg/t  steel.

5.Steelmaking use active lime,dephosphorization , desulfurization ability  is significant,slagging is fast , the production efficiency can be increased by  5%~10%.

6.Quality requirement of the active lime limestone:CaO≥52% SiO2≮2.0%  MgO≮1.5%