Accelerating Lime Slag Calcination during Blowing Processes
The process of calcination, also known as lime burning, involves the burning of calcium carbonate to calcium oxide. Calcination is common in many industrial processes and has a variety of applications, such as the production of quicklime, cement, and metallurgical materials. Calcination is achieved through various methods of heating, such as the use of a furnace, kiln, or oven. In some instances, blown calcination is used for the calcination of a slag containing material, such as stone and lime. This process involves the blow-or injection- of air containing calcium silicates into a flame. This process is used to accelerate the calcination of slag composed of calcium silicates.
Blowing process is a type of accelerated calcination that has been employed for a long time, especially for the calcination of stone and lime. The process involves the control of heat, gas, and mass transfer and is used to accelerate the calcination of material at a higher temperature than that produced by traditional furnace methods. The process involves the injection of air, containing calcium silicates, into a stream of high-temperature air. The air is then passed through a number of burners, where it is heated to temperatures ranging from 1200 to 1400°C (2192 to 2552°F). The hot air then passes through the material, which releases its calcium content, enabling more complete calcium-silicate conversions and more efficient calcinatio process. The process may also involve direct injection of hot air into the reaction zone.
The benefits of blown calcination are numerous. As mentioned, the temperature of calcination can be increased, reducing the amount of time needed for the process and enabling more efficient conversions. The process also reduces the amount of fuel and energy needed for the process. In addition, calcination yields are improved, as a greater proportion of the material is convert to the desired product. Finally, because the process does not involve large furnace or ovens, operational costs are reduced.
When undertaking a blown calcination process, several factors must be taken into consideration. It is important to ensure that a suitable burner is used and that air and particle movement are sufficient to achieve efficient calcium silicate reactions. In addition, the air temperature and velocity must be controlled to ensure that the reaction conditions are precisely maintained. Finally, it is important to monitor the rate of reaction and temperature during the calcination process to ensure that it is carried out in a safe and efficient manner.
Overall, blown calcination is an effective and efficient method of calcination, and can be used to reduce time and energy requirements whilst improving calcination yields. By carefully planning and controlling the process, it is possible to achieve a high degree of success in the calcination process in fewer steps, ultimately resulting in a more efficient and economical process.
