| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to chemical industry and can be used as a component of hydraulic binder for making cement and construction materials. Method involves firing lump magnesite in fixed bed in a furnace, heated by gaseous fuel, and subsequent crushing of burnt product. Firing is carried out in an annular furnace with a movable bottom, firing temperature of magnesite is maintained within range of 650÷800 °C with content of impurities in magnesite higher than 8.0 % and 650÷950 °C with content of impurities in magnesite less than 8.0 %. Thickness of magnesite layer on furnace hearth is kept at 45 ± 15 mm, gaseous fuel used is generator synthesis gas produced by coal gasification. Lump magnesite with particle size not more than 30 mm with content of fraction of minus 5 mm not more than 15 % is fired. In annular furnace is maintained under pressure not less than 500 Pa, and flue gases from firing furnace is used for heating of magnesite before firing.EFFECT: invention provides continuous process of firing magnesite in a furnace, control of composition of atmosphere in firing furnace by maintaining optimum vacuum therein, reduce volume of dust formation.3 cl, 1 dwg, 5 tbl, 3 ex |
