Matters needing attention in the roasting process of high-purity alumina
Do you know what are the issues to be paid attention to in the roasting process of high-purity alumina? Let us describe it below. Interested friends may wish to take a look at it, and there may be unexpected gains!
1. High purity alumina needs to stabilize the temperature of heavy oil for fuel supply
The high temperature rotary kiln uses heavy oil for combustion, and it is an important problem to be solved first to stabilize the thermal parameters of the oil supply circuit. From the perspective of the oil circuit system, the oil supply pressure is relatively stable, but the oil supply temperature must be controlled by heating and constant temperature. An electric heater device is installed in the oil inlet of the kiln, the oil temperature is raised by the electric heater, and the electric heating load is automatically adjusted by the outlet temperature of the heater, so as to realize the stable temperature of the heavy oil for combustion. In addition, in order to stabilize the oil quantity of heavy oil and consider the change of production load, an automatic adjustment circuit of heavy oil quantity is designed. The automatic adjustment of the oil volume and temperature of the heavy oil ensures the stability of the thermal parameters of the rotary kiln combustion system.
2. High purity alumina requires temperature adjustment in the kiln
Rotary kiln materials must be stably and high-quality roasted, and the kiln tail feeding system must be stably controlled. First of all, we consider the constant quantity control of the material, and use the metering control unit to adjust the feeding amount of the skirt feeder to achieve uniform feeding. At the same time, the metering control unit adjusts the screw of the batching silo in a micro-proportion to make the batching branch follow. The kiln tail temperature and the average temperature in the kiln are given outside the constant material adjustment loop to form a series adjustment loop to overcome the constant material operation state caused by the macroscopic temperature interference in the kiln (from random quantities such as material moisture and fuel quality). Over-burning or under-burning that may occur. In addition, the detection and control system of the rotary kiln has also designed the negative pressure at the kiln tail-exhaust closed-loop regulation circuit, the motor operation chain protection circuit, etc.
