# US 8,540,816 B2 · Aggregate and filler extracted from slag > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,816 B2 - Document ID: US8540816B2 - Status: Granted - Kind: B2 - Application number: 12/376,206 - Filed: 2007-08-10 - Published: 2009-10-22 - Granted: 2013-09-24 - Earliest claimed: 2006-08-10 - Assignees: Sachtleben Chemie GmbH - Applicants: Djamschid Amirzadeh-Asl - Inventors: Djamschid Amirzadeh-Asl - Web page: https://patentgrep.com/patent/US8540816B2 ## CPC - C22B 21/0069: {from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents (C22B21/0046, C22B21/0053 and C22B21/0092 take precedence)} - C04B 40/0042: {Powdery mixtures} - C05D 3/04: from blast-furnace slag or other slags containing lime or calcium silicates - C21B 3/06: Treatment of liquid slag - C21C 5/36: Processes yielding slags of special composition - C22B 7/04: Working-up slag - C04B 2111/1081: {Chromium VI, e.g. for avoiding chromium eczema} - C21B 2400/02: Physical or chemical treatment of slags - Y02P 10/20: Recycling - Y02W 30/50: Reuse, recycling or recovery technologies - Y02W 30/91: Use of waste materials as fillers for mortars or concrete - C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS - 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 - C05D: INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE - C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00) - C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS - Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT ## Abstract An aggregate and/or filler extracted from slag, a method for the production thereof, and the use thereof. ## Claims ### Claim 1 A recyclate comprising components obtained during extraction of metals from an aluminum salt slag, which contains up to 3 wt. % nitrides, wherein said recyclate further comprising an iron-sulfate-containing additive. ### Claim 2 (depends on 1) The recyclate according to claim 1, wherein the nitride is aluminum nitride. ### Claim 3 (depends on 1) The recyclate according to claim 1, having a chromate solubility of less than 2 mg/kg. ### Claim 4 (depends on 1) The recyclate of claim 1, containing less than 1.5 wt. % free CaO or free MgO. ### Claim 5 (depends on 1) The recyclate of claim 1, containing less than 1 wt. % free CaO or free MgO. ### Claim 6 (depends on 2) The recyclate of claim 2, containing less than 1 wt. % nitrides. ### Claim 7 (depends on 1) The recyclate according to claim 1, wherein the iron-sulfate-containing additive comprises at least one member selected from the group consisting of iron(II) sulfate, iron(III) sulfate, iron(II)-containing spent sulfuric acids, iron(III)-containing spent sulfuric acids, metal-sulfate-containing iron sulfates, a mixture of iron(II) sulfate heptahydrate and iron(II) sulfate monohydrate, and a mixture of green salt and filter salt. ### Claim 8 (depends on 1) The recyclate according to claim 1, wherein the iron-sulfate-containing additive is present in an amount of from 0.1 to 95 wt. %. ### Claim 9 (depends on 1) The recyclate according to claim 1, wherein the grain size of the recyclate is between 0.01 and 64 mm. ### Claim 10 (depends on 1) The recyclate according to claim 1, wherein that the pH value of the recyclate is adjusted to between 2 and 13. ### Claim 11 (depends on 1) A process for the production of a recyclate according to claim 1, comprising reacting said slag with an iron-sulfate-containing additive. ### Claim 12 (depends on 11) A process according to claim 11, wherein the iron-sulfate-containing additive is at least one selected from the group consisting of iron(II) sulfate, iron(III) sulfate, iron(II)-containing spent sulfuric acid, iron(III)-containing spent sulfuric acid, a metal-sulfate-containing iron sulfate, a mixture of iron(II) sulfate heptahydrate and iron(II) sulfate monohydrate, and a mixture of green salt and filter salt. ### Claim 13 (depends on 11) A process according to claim 11, wherein the iron-sulfate-containing additive is provided as a solution, as moist filter cake or in powder form. ### Claim 14 (depends on 11) A process according to claim 11, wherein the reaction takes place in a high-speed mixer. ### Claim 15 (depends on 11) A process according to claim 11, wherein the iron-sulfate-containing additive is present in an amount of from 0.1 to 95 wt. %. ### Claim 16 (depends on 11) A process according to claim 11, wherein a grain size of the slag is between 0.01 and 64 mm. ### Claim 17 (depends on 11) A process according to claim 11, wherein the resulting recyclate is dried and granulated or ground. ### Claim 18 (depends on 11) A process according to claim 11, wherein recyclate is dispersed in water, filtered, and ground to a fine powder or deagglomerated. ### Claim 19 (depends on 1) A process comprising adding the recyclate of claim 1 in a metallurgic process. ### Claim 20 (depends on 2) A process for the production of a recyclate according to claim 2, comprising reacting said slag with an iron-sulfate-containing additive. ### Claim 21 (depends on 20) A process according to claim 20, wherein the iron-sulfate-containing additive is at least one selected from the group consisting of iron(II) sulfate, iron(III) sulfate, iron(II)-containing spent sulfuric acid, iron(III)-containing spent sulfuric acid, a metal-sulfate-containing iron sulfate, a mixture of iron(II) sulfate heptahydrate and iron(II) sulfate monohydrate, green salt and filter salt. ### Claim 22 (depends on 20) A process according to claim 20, wherein the iron-sulfate-containing additive is provided as a solution, as moist filter cake or in powder form. ### Claim 23 (depends on 20) A process according to claim 20, wherein the reaction takes place in a high-speed mixer. ### Claim 24 (depends on 20) A process according to claim 20, wherein the iron-sulfate-containing additive is present in an amount of from 0.1 to 95 wt. %. ### Claim 25 (depends on 20) A process according to claim 20, wherein a grain size of the slag is between 0.01 and 64 mm. ### Claim 26 (depends on 20) A process according to claim 20, wherein the resulting recyclate is dried and granulated or ground. ### Claim 27 (depends on 20) A process according to claim 20, wherein recyclate is dispersed in water, filtered, and ground to a fine powder or deagglomerated. ### Claim 28 (depends on 2) A process comprising adding the recyclate of claim 2 in a metallurgic process. ### Claim 29 (depends on 1) The recyclate according to claim 1, having a chromate solubility of less than 2 mg/kg. ### Claim 30 (depends on 1) The recyclate according to claim 1, further comprising an iron-sulfate-containing additive. ### Claim 31 (depends on 30) The recyclate according to claim 30, wherein the iron-sulfate-containing additive comprises at least one member selected from the group consisting of iron(II) sulfate, iron(III) sulfate, iron(II)-containing spent sulfuric acids, iron(III)-containing spent sulfuric acids, metal-sulfate-containing iron sulfates, a mixture of iron(II) sulfate heptahydrate and iron(II) sulfate monohydrate, and a mixture of green salt and filter salt. ### Claim 32 (depends on 30) The recyclate according to claim 30, wherein the iron-sulfate-containing additive is present in an amount of from 0.1 to 95 wt. %. ### Claim 33 (depends on 1) The recyclate according to claim 1, wherein the grain size of the recyclate is between 0.01 and 64 mm. ### Claim 34 (depends on 1) The recyclate according to claim 1, wherein the pH value of the recyclate is adjusted to between 2 and 13.