ORALS

The rotary kiln process that produces magnesite sinter creates a considerable amount of dust that contains up to 96% MgO [1]. Usually the quantity of the produced dust is 16% of the quantity of the magnesite concentrate charged in the Rotary Kiln. Up to now, about 90% of the dust is recycled with the feed of the Rotary Kiln, while about 10% of this quantity is lost with the gas. The quantity of the dust recycled creates various problems in the Rotary Kiln such as process disturbances, creation of accretions that decrease the active volume, and decreases in the productivity of magnesite sinter. Another alternative is to stop dust recycling in the Rotary Kiln and use it as a raw material to produce magnesium sulphate in a separate unit after the dedusting chamber. Eliminating dust recycling in the Rotary Kiln will improve the stability and efficiency of the process, increase the production rate since new magnesite concentrate will be charged in the feed instead of the dust, and significantly decrease the production cost of the magnesite sinter. The magnesium sulphate produced in this way will also constitute a new marketable product that will increase the profit of the company. In this paper, the production of magnesium sulphate using the magnesite sinter Rotary Kiln dust as a raw material will be studied and evaluated and the best production technology will be suggested while, in a subsequent publication, a description of the project on building and commissioning of magnesium sulphate production unit and its process will be described.

References:
[ 1 ]. Upustvo za rukovanje postrojenjem za pecenje magnezita sa kapacitetom od 150t/dan. Magnohrom, rudnik nmagnezita Goles, I sveska sa prilozima, Budimpesta, maja 1972, M4 - 02012,