Lime is a catalyst that must be used in many industries, and the main role of lime is used as reducing agent in many cases. For example, slagging in steel mills is to replace iron with calcium oxide, so the activity of lime will affect the efficiency and quality of iron replacement in steel mills, which is why high activity lime is chosen in steel mills.
Lime is calcined by limestone through lime kiln at high temperature. The scientific name of lime is calcium oxide. Calcium oxide reacts with water and carbon dioxide in air. So the reaction between lime and water in air produces calcium hydroxide. The reaction between lime and carbon dioxide produces reversible reaction of calcining lime process. Their chemical reaction equations are: CaO+CO2 = CaCO3 exothermic, CaO + H 2 = Ca (OH) 2 exothermic.
Of course, the above two deteriorating factors of calcium oxide lime, including water deterioration factor will be a little larger, because the reaction of carbon dioxide and calcium oxide in dry environment is very slow, of course, according to the different uses of lime lime kiln production line, the length of fresh-keeping period of lime is also different, we use steel plant lime and construction lime as a comparison. Free 24-hour consultation: 086+18568631888
Lime for steel mill: In general, the activity requirement of lime for steel mill is relatively high, so the fresh-keeping period of lime is relatively short. Many steel mills will have their own lime mills, which are basically used up on the same day of calcination on the same quantitative day. So the amount of high-quality lime deteriorated in the air is not very large. At the same time, we also found that the thermal network for lime with the passage of time. The average activity of lime was 324.3 after 12 hours, 306.3 after 18 hours, 300 after 24 hours, 292 after 48 hours and 283.9 after 72 hours. Data show that the activity of lime decreases by 12.5% in 72 hours, so the shelf life of lime for steel mills is between 12 hours and 24 hours.
Construction lime: Usually, construction lime is digested by calcium oxide to obtain calcium hydroxide. Then, calcium hydroxide lime emulsion is added to clay and cement and other building materials. Finally, the mixture is used to stick between bricks and bricks, so the activity of lime is not very important for construction lime. For building ash, the shelf life will be longer.
Tongjia Industry recommends that you choose the corresponding active lime according to the different uses of lime and arrange the use of lime in the fresh-keeping period, so as to make the lime play the greatest role and improve the quality of products which need lime as catalyst. If you need to know the fresh-keeping period of lime or build a
lime kiln production line, you can. In order to contact our Tongjia industry. Free 24-hour consultation: 086+18568631888
