Dust collection systems for alumina industry

Alumina calcination kiln (clinker kiln, roasting kiln, cement kiln) exhaust dust concentration is high, mature treatment process is cyclone dust collector plus electrostatic precipitator, the recovery of dust materials can be directly returned to the process to use. Early usage of lattice-type electrostatic precipitator is transplanted from the former Soviet Union over the old equipment, smaller specifications, steel consumption, a kiln need to be equipped with several electrostatic precipitator, and covers an area is large. In addition, the equipment performance is also poor, such as uneven distribution of airflow, air leakage, dust collection efficiency is low, the ash system complexity.
The current new project in the electrostatic precipitator selection has a greater breakthrough, the general usage of three electric field new plate anode, frame cathode, specifications up to 100 square meters above the electrostatic precipitator, equipped with SCR automatic tracking pressure regulator. Basically can do a kiln equipped with an electrostatic precipitator. This pipe is simplified, the amount of steel is reduced, the cathode is not easy to swing, dust collection surface area and smoke through the more reasonable speed, dust collection efficiency improved significantly (up to 99.5%). In recent years, with the use of suspension preheating, kiln decomposition and boiling roasting new technology, the production kiln utilization rate is improved, the exhaust gas temperature is reduced, the working condition of the electrostatic precipitator is greatly improved, the dust collecting efficiency can be as high as 99.9%, and dust concentration dropped to 60-100mg / m³, in line with emission standards.
Ventilation dust collection system widely used in bag filter, dust removal efficiency of 99%, can achieve discharge standards. Clinker dust due to high temperature, abrasive, more difficult to capture. The usage of clinker powder hydrophilic strong features, equipped with large diameter water bath precipitator, washed with red mud dust, the effect is better. Wash the mud after the return to the production process can be used, the water bath scars on the regular cleaning is also more convenient.