METHOD FOR DEHYDRATION OF RAW CARNALLITE IN FLUIDISED BED THREE-CELL FURNACE Russian patent published in 2008 - IPC C01F5/34 

FIELD: chemistry.

SUBSTANCE: dehydration of raw carnallite is carried out in fluidised-bed three-cell furnace. The third cell of the furnace is divided into half-cells by means of partitions with overflow windows. In the first cell, raw material is dehydrated by supplying a mixture of natural gas combustion products and air into the raw material layer, while in the second and third cells - by supplying flue gas resulting from combustion of natural gas, air and chlorine gas. Product is gravitated continuously from one of the first upstream half-cells of the third cell and at regular intervals of 0.1-0.5 h from the last half-cell of the third cell through the discharge fitting, when fluidised bed level rises over the overflow windows. Amount of the product being discharged depends on amount thereof in the layer between the discharge fitting and partition overflow window. In intermittent mode of the furnace operation, uniform height of fluidised mass in each cell is maintained. Deep-dehydrated carnallite is discharged from the last half-cell of the third cell of the furnace, when temperature of 280-360°С is reached.

EFFECT: reduction in heat loss and flue gas consumption.

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