Lime activity is the speed of quicklime hydration reaction. The quality of active lime is often measured by "activity". The activity reflects the ability of lime to react with other substances and is one of the important indicators for testing lime quality.

Lime is the main solvent for sintering. The addition of lime during the sintering process can make the alkalinity of the sinter reach a certain requirement, ensuring that no or less limestone is added in the blast furnace smelting. Practice has proved that adding high-activity lime can not only strengthen the sintering, but also improve the sintering performance. Yield and quality, and the activity of lime affects the crystal shape of calcium ferrite and the quantity of calcium ferrite in the sinter. The lime with high activity is beneficial to the formation of fine needle-like and needle-like calcium ferrite. At the same time, the high-activity lime can improve the smelting 80% of the efficiency of removing P and S from steel, while shortening the smelting time, it can completely react with the acidic substance in molten steel within 3-5 minutes, while the reaction of lime generally takes at least 6-10 minutes. In addition, the use of high-activity lime can increase the furnace life by 40 % Above, the consumption of charge per ton of steel is also reduced by 5-8Kg. Therefore, how to accurately determine the activity of lime, especially the activity of high-activity lime, has attracted increasing attention, and this instrument effectively solves this problem. .

Active lime

(1) Lime milk and mortar slaked lime powder or lime paste mixed with a lot of paint. Lime paste or slaked lime manufacturers can prepare lime mortar or cement-lime mixed mortar for masonry or plastering projects.

(2) Lime stabilized soil The mixture obtained by mixing slaked lime powder or quicklime powder into various crushed or originally loose soils, after mixing, compacting and curing, is called lime stabilized soil. It includes lime soil, lime stabilized gravel soil, lime gravel soil and so on. Lime stabilized soil has certain strength and water resistance. It is widely used as the foundation of buildings, the cushion of the ground and the pavement base of roads.

(3) Silicate products use lime (slaked lime powder or quicklime powder) and siliceous materials (sand, fly ash, pozzolan, slag, etc.) as the main raw materials, and can be made into bricks after batching, mixing, molding and curing. , Blocks and other products. Because the internal gelling material is mainly hydrated calcium silicate, it is called silicate products. Commonly used are lime sand bricks and fly ash bricks.

In order to speed up the slag formation rate, the price of active lime is used in steelmaking. Activated lime has strong chemical properties and ability to participate in the reaction, and the content of harmful impurities is low. The characteristics of activated lime are: porosity ≥50%; volume density between 1.5-1.7 g/cm3; specific surface area is 1.5-2.0 m2/g; CaO crystals ≤1 wm; CaO content ≥90%; activity >300ml ; S, P content is low.