What Is Cement Kiln?
What Is Cement Kiln?
Cement kiln is a kind of large-scale industrial equipment for calcining cement clinker. It consists of the cylinder, preheater, suspension preheater, and kiln body.
The rotary kiln has high production capability and strong adaptability to raw materials, fuel and product types; it can be widely used in various building materials, metallurgy, chemical industry, environmental protection and other industries to burn all kinds of cement clinker with different components as well as other materials.
In addition, it also has good heat transfer performance, making it suitable for firing medium-hard or weakly combustible bulk materials such as coal Dust.
What Is Kiln Process?
Kiln process is a type of baking or firing process used in the manufacture of ceramics and other materials.
The process involves high temperatures, typically greater than 950°C that are applied to raw materials such as clay and minerals to create objects with desired shapes.
During the kiln process, heat is evenly distributed throughout the chamber in order to ensure an even hardening of the material being fired as well as often providing a decorative glaze.
Different firing methods can be used depending on the desired outcome of the product being made.
What Type Of Kiln Are Used For Burning Of Cement?
Kilns used for burning of cement are typically of two types: rotary kilns and vertical shaft kilns. Rotary kiln is the main equipment in cement production, which is usually divided into two-thirds calcining, one-third preheating and cooling.
It has a high thermal efficiency and uses coal as fuel. The long cylindrical tube is made of steel plates and lined with refractory bricks to preserve heat.
In order to make full use of the combustion heat, a cold air pipe is installed at the top of the shell so that part of the hot air generated by burner exhausts through the cold air pipe; meanwhile some fuel can be put into the cold air pipe to increase overall thermal efficiency.
Vertical shaft kilns require less space compared with rotary kiln and they have higher thermal efficiency as well, but their operational cost is higher than rotary kiln due to special construction techniques.
What Should Be The Kiln Temperature In Cement?
The kiln temperature in a cement plant should be closely monitored and regulated to ensure the quality of the end product.
In general, temperatures in the preheating zone of the kiln should stay between 600-750˚C while the burning zone should hover between 1300-1450 °C.
As a reference point, clinker is usually formed at around 1300-1450 °C and ideally its production should take place as close to this specific temperature as possible.
Careful monitoring within these ranges allows for an optimal combination of efficiency, energy conservation and product quality.
What Is Cement Kiln Dust Used For?
Cement kiln dust (also known as CKD) is the finely-ground, highly alkaline particulate waste material collected from a cement plant’s air pollution control devices.
It is most commonly used as a cement additive to increase strength and durability, reduce shrinkage, and improve workability.
In addition, it can be used as an aggregate in asphaltic concrete surfaces, as a soil amendment, or even to help adsorb hazardous materials like heavy metals or petroleum hydrocarbons.
Furthermore, due to its high alkalinity content it can also be used for pH control and stabilization purposes in acid-related processes such as leaching or precipitating operations.
What Are The 3 Main Types Of Kilns?
Kilns are ovens used to heat materials at high temperatures for a variety of applications. There are three main types of kilns: electric, gas-fired, and wood-burning.
Electric kilns are powered by electricity, providing greater control and efficiency with the ability to reach temperatures up to 2000°F (1093°C).
Gas-fired kilns use natural gas or propane and can reach temperatures higher than electric kilns while consuming less fuel.
Finally, wood-burning kilns are the oldest form of kiln but offer an alternative when other fuels may be unavailable or impractical.