From the general development trend, China's active lime production equipment should be based in the country. Regardless of the adaptability of production capacity or the full utilization of limestone mine resources, rotary kilns have good development prospects.

The advantages of active lime rotary kiln are as follows:

1. The rotary kiln has a high output and is very suitable for large-scale active lime production lines. Now there was a lime rotary kiln with a daily output of 2,200 tons in production in the world. Many lime rotary kilns with a daily output of 150-300 tons have been built at home and abroad, and they are in good operating conditions and are also suitable for small and medium lime enterprise.

2. The rotary kiln is open-type calcination, the kiln body structure is simple, and the gas flow is smooth. The sulfur-containing flue gas can be discharged in time, and the sulfur in the fuel is not easy to adhere, so the product has low sulfur content and meets the requirements of steelmaking. At the same time, the materials are uniformly rolled forward in the kiln, heated evenly. So the product quality is stable, the rate of burning and over burning is very low. It can be used for calcining high-activity steel-making lime. Under the same conditions, the activity of lime produced by rotary kilns is higher than that of gas-fired kilns, with an average higher activity than 30ml, and the activity is generally 340-380ml, even as high as 400ml.

3. Rotary kiln can directly calcine 10-50mm fine-grained limestone. Generally, 0-30mm fine-grained limestone accounts for about 30-40% of the total output. This part of limestone cannot be used by other kiln. And with the "refining" of steel raw materials, sintering gradually replaces limestone with quicklime. So that fine-grained limestone cannot be comprehensively utilized. The construction of a rotary kiln production line can not only make full use of limestone mine resources, but also conform to the sustainable development policy of the lime industry.

4. The configuration of a vertical preheater at the kiln inlet can make full use of the high-temperature flue gas produced by the calcination in the rotary kiln to preheat the limestone from ambient temperature to the 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. The configuration of the vertical cooler at the kiln outlet can not only quench the high temperature lime, improve the activity of the product, but also facilitate the transportation and storage. At the same time, high temperature secondary air enters the kiln. It can effectively increase the firing temperature in the kiln and reduce fuel consumption.

6. The temperature of the flue gas discharged by the vertical preheater at the kiln inlet is low, between 280-350℃. The dust content is low, about 20g/Nm³, which makes the configuration of subsequent flue gas treatment simple and effective, and can smoothly meet the environmental protection requirements.

7. The lime quality calcined by rotary kiln is stable, which is the main advantage.