Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.

Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.

A vertical roll mill may include a grinding plate, a grinding roll, a nozzle ring that horizontally surrounds the grinding plate, an air feed apparatus disposed under the nozzle ring, a discharge element disposed below or in a region of the air feed apparatus, and a bypass apparatus disposed in the nozzle ring. The bypass apparatus may form a connection between the nozzle ring and the discharge element. Further, the bypass apparatus can discharge particles that are difficult to grind, for example, ductile particles such as iron particles, from the grinding process. In some examples, the bypass apparatus includes a gas-impermeable outer skin in the region of the air feed apparatus.

A vertical roll mill may include a grinding plate, a grinding roll, a nozzle ring that horizontally surrounds the grinding plate, an air feed apparatus disposed under the nozzle ring, a discharge element disposed below or in a region of the air feed apparatus, and a bypass apparatus disposed in the nozzle ring. The bypass apparatus may form a connection between the nozzle ring and the discharge element. Further, the bypass apparatus can discharge particles that are difficult to grind, for example, ductile particles such as iron particles, from the grinding process. In some examples, the bypass apparatus includes a gas-impermeable outer skin in the region of the air feed apparatus.

Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.

Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.

The present invention relates to a system and a process for dry recovery of iron oxide fines from iron bearing compact and semicompact rocks that comprise primary (5), secondary (6) and tertiary (7, 7) crushing means for preliminarily reducing the granulometry of ores containing the iron oxide fines in compact and semicompact rocks; means for finely grinding (10, 10, 21) iron oxide minerals reduced through primary (5), secondary (6) and tertiary (7, 7) crushing, provided with a dynamic air classifier (3.5, 4.6, 5.4); means of static air classification (11, 12, 13) arranged in series for intermediate granulometric cuts and bag filters (14) for retaining fine fraction; and means of magnetic separation (15, 16, 17), through magnetic rolls (71, 72, 73) arranged in cascade at a variable leaning angle, and formed by high and/or low magnetic intensity magnets,

The present invention relates to a system and a process for dry recovery of iron oxide fines from iron bearing compact and semicompact rocks that comprise primary (5), secondary (6) and tertiary (7, 7) crushing means for preliminarily reducing the granulometry of ores containing the iron oxide fines in compact and semicompact rocks; means for finely grinding (10, 10, 21) iron oxide minerals reduced through primary (5), secondary (6) and tertiary (7, 7) crushing, provided with a dynamic air classifier (3.5, 4.6, 5.4); means of static air classification (11, 12, 13) arranged in series for intermediate granulometric cuts and bag filters (14) for retaining fine fraction; and means of magnetic separation (15, 16, 17), through magnetic rolls (71, 72, 73) arranged in cascade at a variable leaning angle, and formed by high and/or low magnetic intensity magnets,

Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.

Magnetic filter systems may be constructed with various arrangements of permanent magnets, including but not limited to checkerboard and spiral arrangements. When coupled to a conventional filter, exemplary magnetic filter systems capture ferrous particulates against the outer wall of the conventional filter by magnetic attraction, thereby reducing the number of particulates in a fluid stream and improving the quality of the filtered fluid.