Roller grinding mill and method for grinding materials that contain magnetizable components

Abstract

The invention relates to a roller mill, particularly an air-swept roller mill provided with a device for separating magnetizable constituents, particularly iron particles from the milling area. The invention also relates to a method for grinding materials with magnetizable, particularly iron-containing constituents, e.g. slag, in an air-swept roller mill where, for avoiding concentrations of magnetizable particles, particularly iron particles, on the grinding pan, said particles are electromagnetically separated and removed from the roller mill.

Description

technical field

[0001] The invention relates to a roller mill according to the preamble of claim 1, in particular to an air-swept roller mill according to the preamble of claim 4 and to a grinding mill according to the preamble of claim 14 Method for substances containing magnetizable constituents and especially ferrous constituents. Background technique

[0002] The present invention is preferably used in slag mills for grinding granular blast furnace slag and for cement grinding plants, where the wind-swept roller mill is used for grinding cement slag, gypsum and granular blast furnace slag (German Patent DE 3921986C1).

[0003] Granular blast furnace slag is obtained during the blast furnace treatment of the ironmaking process and contains iron particles which, during the grinding or grinding process, lead to greater wear of the components involved in the process.

[0004] To minimize wear, the raw material is sent to a magnetic separator and especially a belt-type magn...

Examples

Embodiment Construction

[0036] figure 1 denotes a LOESCHE air-swept roller mill 2 which is especially intended for grinding cement and granulated blast furnace slag and is equipped with two pairs of rollers 3 , 15 . In order not to make the expression too complicated, figure 1 Two grinding rolls 3 are shown, but only one auxiliary roll 15 . but figure 2 Two pairs of rolls are shown, which in any case comprise a grinding roll or master roll 3 and a secondary or slave roll 15 .

[0037]The master roll 3 and the slave roll 15 roll on an abrasive bed consisting of material in the grinding path of a rotating grinding table 4 . The grinding disc 4 is driven in rotation by a gear 8 and is surrounded by a blade ring 6 , by means of which an air flow, in particular wind, flows from an annular channel 7 into the grinding area 5 . Raw materials such as blast furnace slag or cement slag, a mixture of gypsum and slag are supplied to the wind-swept roller mill through a metering or batching mechanism, a magne...

technical field

[0001] The invention relates to a roller mill according to the preamble of claim 1, in particular to an air-swept roller mill according to the preamble of claim 4 and to a grinding mill according to the preamble of claim 14 Method for substances containing magnetizable constituents and especially ferrous constituents. Background technique

[0002] The present invention is preferably used in slag mills for grinding granular blast furnace slag and for cement grinding plants, where the wind-swept roller mill is used for grinding cement slag, gypsum and granular blast furnace slag (German Patent DE 3921986C1).

[0003] Granular blast furnace slag is obtained during the blast furnace treatment of the ironmaking process and contains iron particles which, during the grinding or grinding process, lead to greater wear of the components involved in the process.

[0004] To minimize wear, the raw material is sent to a magnetic separator and especially a belt-type magn...

Examples

Embodiment Construction

[0036] figure 1 denotes a LOESCHE air-swept roller mill 2 which is especially intended for grinding cement and granulated blast furnace slag and is equipped with two pairs of rollers 3 , 15 . In order not to make the expression too complicated, figure 1 Two grinding rolls 3 are shown, but only one auxiliary roll 15 . but figure 2 Two pairs of rolls are shown, which in any case comprise a grinding roll or master roll 3 and a secondary or slave roll 15 .

[0037]The master roll 3 and the slave roll 15 roll on an abrasive bed consisting of material in the grinding path of a rotating grinding table 4 . The grinding disc 4 is driven in rotation by a gear 8 and is surrounded by a blade ring 6 , by means of which an air flow, in particular wind, flows from an annular channel 7 into the grinding area 5 . Raw materials such as blast furnace slag or cement slag, a mixture of gypsum and slag are supplied to the wind-swept roller mill through a metering or batching mechanism, a magne...

Images