2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
| Feasibility of Producing Caustic Calcined Magnesia in Multiple Hearth Furnaces Musa Rizaj1; Nurten Deva2; Edward Z. Obrien3; Florian Kongoli4; 1PRISHTINA UNIVERSITY, Prishtina, Kosovo; 2PUBLIC UNIVERSITY OF MITROVICE - ISA BOLETINI - , FACULTY OF GEOSCIENCES, REPUBLIC OF KOSOVA, Mitrovice, Kosovo; 3FLOGEN TECHNOLOGIES, Wilmington, United States; 4FLOGEN TECHNOLOGIES INC., Mont-Royal, Canada; PAPER: 386/Non-ferrous/Keynote (Oral) SCHEDULED: 14:25/Mon./Pontal (50/2nd) ABSTRACT: The magnesite (MgCO<sub>3</sub>) obtained from the magnesite mine in Strezovc, Kosovo is used as the raw material to produce caustic calcined magnesia (CCM) using roasting in rotary furnaces. The process takes place at temperatures between 600-850°C, which enables complete dissociation of magnesium carbonate and produces CCM as a very active powder. The ore enters at one end of the rotary furnace, passes through it in rotary movement, while the temperature increases and CCM is obtained at the end of the furnace. One the disadvantages of this process is the large amount of dust in the gas that reaches up to 30-35% of the total amount of raw materials. An alternative technology of producing CCM is the Multiple Hearth Furnace, which is a vertical furnace with a number of circular hearths on top of each other, a central shaft, rakes and rabble arms. The ore enters in the upper parts of the furnace and moves toward the floor through multiple hearths while gases go in opposite directions, heating the materials that come down towards the floor. The object of this work is to evaluate, in cooperation with FLOGEN Technologies Inc. Canada/USA, the feasibility of producing CCM in the Multiple Hearth Furnace instead of the rotary furnace in terms of technical, economic, and environmental aspects. |
