| 摘要 |
Method for grinding intended for a rotary ball mill (4, 5), or mill with similar grinding instruments, which is divided into at least two grinding compartments (1, 2) and which is passed through by a current (14) of sweeping air from upstream to downstream and is in a closed circuit; the said mill including at least one separation partition (3) which, between two grinding compartments (1, 2) forms a small compartment (7) bounded by upstream (8) and downstream (9) walls pierced with slots (10); the said partition (3) being provided with means (12) for lifting the material, whilst not having any mechanical means for diverting the material downstream, and the material being capable of circulating diametrically through the small compartment (7) of the partition (3); means for regulating the mass of material passing through the mill, and means for regulating the quantity of sweeping air passing through the grinder being provided; this method being characterized in that a partition (3) is used which is provided with means preventing the material from passing through the central part (15) of its downstream wall (9), and in that the transfer of the material from the grinding compartment upstream of the partition to the compartment downstream is carried out essentially by the combined effect; a) of the pressure difference within the material situated in the compartments upstream and downstream of the partition, and b) of the quantity of sweeping air passing through the mill; the level of material in the small compartment formed by the partition being regulatable, by setting the mass of material passing through the mill and the quantity of air sweeping the mill. |
