Generally speaking,there are two types of lime kiln according to different fuels, namely, mixed-lime shaft kiln and gas-fired lime kiln.
Mixed-lime shaft kiln
Mixed-lime shaft kiln: Mixed-lime shaft kiln generally refers to a lime kiln that uses solid fuel to burn lime, including: coke, coal, etc. as fuel shaft kiln. The so-called modern environment-friendly and energy-saving co-fired lime shaft kiln means that it has a reasonable height-to-diameter ratio and can realize the three-stage thermal process in the kiln, that is, the preheating zone, the calcination zone, and the cooling zone. The heat energy of the fuel can be fully utilized, and the kiln top feeding and kiln ash unloading are closed during the whole operation process, and the flue gas is discharged from the pipeline and is discharged through dust removal to achieve pollution-free discharge. It is mechanized or automatically operated and controlled from feeding, cloth, material level, temperature detection, and ash unloading, which can save energy and protect the environment.
Gas-fired lime kiln
A gas-fired lime kiln is a kiln that uses gas fuel to burn lime. It is called a gas-fired lime kiln. The gas fuels that can be used for burning lime include: blast furnace gas, coke oven gas, natural gas, producer gas, biogas and other combustible gases.
Application of limestone produced in lime kiln
Limestone is a common non-metallic mineral. Ourcountry’s limestone mineral resources are abundant, accounting for more than 64% of the world’s total reserves, and it is a natural resource with advantages.
Limestone can still be used for a lot of purposes after producing light calcium carbonate: it can be used as a filler in industries such as rubber, plastics, paper making, coatings and inks. Widely used in organic synthesis, metallurgy, glass and asbestos production. It can also be used as a seeding agent for industrial wastewater, an antacid for gastric and duodenal ulcers, an antidote for acidosis, an SO2 scavenger in waste gas containing SO2, a feed additive for dairy cows, and an anti-sticking agent for linoleum . It can also be used as a raw material for tooth powder, toothpaste and other cosmetics.
Limestone produces high-grade paper-making coating-grade ground calcium carbonate products. This kind of high value-added fine, ultra-fine and active ground calcium carbonate is widely used in papermaking process. After crushing, the general particle size – 2μm≥90% is used in neutral sizing papermaking process; – 2μm particle size≥50 % is mainly used as filler for coated paper.
High-calcium limestone can produce high-quality metallurgical lime after high-temperature calcination, which can play a good role in desulfurization in the steel refining process. It is a very good metallurgical auxiliary material and can play a good role in desulfurization in the production of special steel. High-calcium limestone has many advantages, and it still has a good prospect in industrial application, which is worth our research.
