Rotary kiln: Due to its high utilization rate of raw materials, high product quality, high degree of mechanization, easy operation and control, high single kiln production capacity, and easy environmental compliance, it has been widely used in the domestic lime industry, especially in the steel industry, in recent years.

These types of lime kilns all have the disadvantage of a narrow range of raw material usage. The limestone particle size range used in the vertical lime kiln is 60-120mm, and the limestone particle size range used in the rotary kiln is 20-40mm, which can be directly used in steel mills. A large amount of 20mm small particle limestone is sold at a low price as slag. The application of mineral resources has caused great waste.

The lime production line of ZK Corp consists of four parts: raw material storage and transportation, limestone calcination, finished product transportation, and flue gas treatment.

(1) Raw material storage and transportation

Limestone with a particle size of 10-50mm is transported to the factory area and stacked in the material yard, which is operated by a loader. The materials with qualified particle size are loaded into the receiving trough set up in the material yard by the loader. The material is quantitatively fed by the feeder under the receiving trough, and the stone is fed to the large angle conveyor before being sent to the screening building. The limestone with qualified particle size after screening is weighed and sent to the top material bin of the preheater by the large angle conveyor. The screened powder is transported to the storage yard by conveyor 3 and regularly removed by shovel trucks.

(2) Limestone calcination

Limestone calcination is composed of a vertical preheater, a rotary kiln, and a vertical cooler, with a production capacity of 100-1200t/d. The material is introduced into the preheater body through a discharge chute from the top material bin of the preheater. At the same time, the high-temperature flue gas introduced from the rotary kiln preheats the material to above 1000 ℃, causing partial decomposition of the limestone. It is then pushed into the tail of the rotary kiln by a hydraulic push rod, and after high-temperature calcination in the rotary kiln, it is discharged into the cooler. The material is cooled by cold air blown in by a fan to an ambient temperature below+60 ℃ and discharged from the cooler. The air blown into the rotary kiln through the cooler is used as secondary air to participate in combustion.

(3) Finished product transportation

Finished lime is unloaded from the cooler and transported to various finished lime storage facilities through chain plate conveyors, bucket elevators, and belt conveyors. The unloading valve under the lime storage bin is used to load the lime in the bin into cars or tank trucks for external transportation. Set up storage warehouses of different sizes according to customer storage requirements.

The finished product storage warehouse adopts circular storage, with 2 finished product warehouses of 5-50mm and 1 finished product warehouse of<5mm, each with a capacity of about 800 tons;

(4) Smoke treatment

The high-temperature flue gas generated by the combustion of the rotary kiln is cooled to below 250 ℃ after heat exchange with limestone in the preheater, and then enters the cyclone dust collector for primary dust collection, capturing large particles of dust before entering the bag filter. After dust removal, it is discharged into the atmosphere through a high-temperature fan, and the dust concentration of the exhaust gas is less than 30mg/m3. Install a cold air control system at the inlet of the dust collector to protect it.