# US 7,635,100 B2 · Process and system for treating steel slag > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,635,100 B2 - Document ID: US7635100B2 - Status: Granted - Kind: B2 - Application number: 11/573,202 - Filed: 2004-09-15 - Published: 2008-02-07 - Granted: 2009-12-22 - Earliest claimed: 2004-08-02 - Inventors: Weitian Zhang - Web page: https://patentgrep.com/patent/US7635100B2 ## CPC - B03C 1/30: Combinations with other devices, not otherwise provided for - B03B 9/04: specially adapted for furnace residues, smeltings, or foundry slags - B03C 1/18: with magnets moving during operation - C04B 5/00: Treatment of {metallurgical} slag (manufacture of slag wool C03B; in, or for, the production of metals C21B, C22B); Artificial stone from molten {metallurgical} slag {(other cast stone C04B32/005; mechanical aspects B28B1/54)} - C21B 3/08: Cooling slag - C22B 7/001: {Dry processes} - C22B 7/005: {Separation by a physical processing technique only, e.g. by mechanical breaking} - C22B 7/04: Working-up slag - C21B 2400/024: with the direct use of steam or liquid coolants, e.g. water - C21B 2400/026: using air, inert gases or removable conductive bodies - C21B 2400/032: Separating slag from liquid, e.g. from water, after quenching - C21B 2400/052: including rotating parts - C21B 2400/056: Drums whereby slag is poured on or in between - C21B 2400/062: Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag - C21B 2400/074: Tower structures for cooling, being confined but not sealed - Y02P 10/20: Recycling - B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B) - B03B: SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00) - C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract This invention relates to a process and system for treating steel slag, which comprises: collecting the steel slag into a tank and carrying the tank onto a tipping device by a hoisting equipment; operating the tipping device to transport the steel slag to a granulating device and granulating the steel slag in the granulating device to form granulated slag; transporting the granulated slag into a drying room with a conveyor, wherein the granulated slag is continuously dried in the drying room at a temperature between 200-300° C. for 30-60 second using exhaust heat from a converter; and transporting dried granulated slag, with the conveyor, to a magnetic separation device to separate carbon metal grains from nonmetal grains contained in the granulated slag. ## Claims ### Claim 1 A process for treating steel slag, comprising the steps of: collecting the steel slag into a tank and carrying the tank onto a tipping device by a hoisting equipment; operating the tipping device to transport the steel slag to a granulating device and granulating the steel slag in the granulating device to form granulated slag; transporting the granulated slag into a drying room with a conveyor, wherein the granulated slag is continuously dried in the drying room at a temperature between 200-300° C. for 30-60 second using exhaust heat from a converter; and transporting dried granulated slag, with the conveyor, to a magnetic separation device to separate carbon metal grains from nonmetal grains contained in the granulated slag. ### Claim 2 A system for treating steel slag, comprising: a hoisting equipment for moving a slag tank onto a tipping device, wherein an outlet of the tipping device couples with a granulating device, an outlet of the granulating device couples with a conveyor, a drying room is provided in the middle portion of the conveyor, a first magnetic separation device is provided at the inner side of a materiel flow from the exit of the conveyor, a second magnetic separation device is provided at the outer side of the materiel flow and under the first magnetic separation device, the tipping device comprises a tipping base, a tipping frame, a front stanchion, and a winding and raising mechanism, the drying room is connected to a hot air outlet of a heat exchanger. ### Claim 3 (depends on 2) The system for treating steel slag according to claim 2, characterized in that there are two terminal plates on both ends of a granulator gear of the granulating device, a plurality of support radial plates and removable knappers are provided between the two terminal plates, a plurality of heat-radiating fins are provided on the knappers, a shaft sleeve is provided in the center portion of the granulating gear, a first half axis is installed at one end of the shaft sleeve and a second half axis is installed at the other end of shaft sleeve, there is a splash ring for cooling the knapper. ### Claim 4 (depends on 2) The system for treating steel slag according to claim 2, characterized in that the drying room comprises a tubular body, a vent, a heat air inlet and a blocking valve, the drying room is connected with a first conveyor belt on its top part, and the blocking valve on the bottom part is coupled to a conveyor belt for transporting dried slag grains.