Performance characteristics

1. Steelmaking practice has proven that active lime can improve desulfurization and dephosphorization efficiency by 80%, while shortening smelting time. It can completely react with acidic substances in the molten steel within 3-5 minutes, while the reaction time of vertical kiln lime is at least 6-10 minutes. In addition, increase the furnace ridge by more than 40%. The consumption of furnace materials has also been reduced by 5-8Kg/t of steel, with an annual savings of about 15 million based on 10 million tons, resulting in significant production benefits
2. The efficiency of S and P removal by activated lime is significantly improved, with an average S removal rate of 34.5% in steelmaking, especially for high S molten iron (S ≥ 0.06%). The consumption of S removal agent can be reduced by about 45%
3. The use of activated lime in steelmaking can reduce iron consumption by 5-15Kg/t compared to non activated lime steelmaking, and can also reduce steel splashing and oxygen sticking; Sticking furnace mouth; Sticky flue phenomenon
4. Decrease in lime consumption per ton: The consumption of activated lime in steelmaking can be reduced by 20-25Kg/ton of steel compared to non activated lime, while the consumption of non activated lime per ton of steel is not less than 65-70Kg, and the consumption of activated lime is 40-41.5Kg/ton of steel
5. Activated lime steelmaking has fast slagging, significant desulfurization and dephosphorization capabilities, and can increase production efficiency by 5% to 10%

Advantages of calcining activated lime in rotary kiln

1. The rotary kiln has a high production capacity and is very suitable for large-scale active lime production lines. Currently, there are 2200 tons of lime rotary kilns in operation worldwide with a daily output of 2200 tons; Many lime rotary kilns with a daily output of 150-300 tons have been built both domestically and internationally, and are operating well, making them suitable for application in small and medium-sized lime enterprises
2. The rotary kiln belongs to open type calcination, with a simple kiln structure, smooth airflow, and timely discharge of sulfur-containing flue gas. The sulfur content in the fuel is not easily attached, resulting in low sulfur content in the product, which meets the requirements of steelmaking. At the same time, the materials roll uniformly in the kiln, are heated evenly, the product quality is stable, and the raw and over burning rates are very low, which can calcine high activity lime for steelmaking. Under the same conditions, the activity level of lime produced by rotary kilns is higher than that of gas fired kilns, with an average height of over 30ml. The activity level is generally 340-380ml, and even up to 400ml
3. Rotary kilns can directly calcine fine limestone particles ranging from 10-50mm. Generally, fine limestone particles ranging from 0-30mm account for 30-40% of the total production of mining products, which cannot be utilized by other kiln types. And with the refinement of steel raw materials, sintering gradually replaces limestone with quicklime, and fine-grained limestone cannot be comprehensively utilized. Constructing a rotary kiln production line can not only fully utilize high-quality limestone mining resources, but also comply with the sustainable development policy of the lime industry
4. Installing a vertical preheater at the kiln tail can fully utilize the high-temperature flue gas generated by calcination in the rotary kiln to preheat limestone from room temperature to its initial decomposition state. This can not only greatly increase the output of the rotary kiln, but also fully reduce the heat consumption per unit product
5. Installing a vertical cooler at the kiln head can not only quench high-temperature lime and improve product activity, but also facilitate transportation and storage. At the same time, it can also obtain higher temperature secondary air entering the kiln. It can effectively increase the firing temperature inside the kiln and reduce fuel consumption
6. The flue gas discharged through the vertical preheater at the kiln tail has a low temperature between 280-350 ℃ and a low dust content of about 20g/Nm3, making the subsequent flue gas treatment configuration simple and effective, meeting environmental protection requirements
7. The stable quality of lime in rotary kilns is its greatest advantage. The equipment for producing activated lime is suitable for the comprehensive development of mining resources and has great development prospects.