EP3143167A1 - Treatments for iron sinter or green mix - Google Patents
Treatments for iron sinter or green mixInfo
- Publication number
- EP3143167A1 EP3143167A1 EP14729806.1A EP14729806A EP3143167A1 EP 3143167 A1 EP3143167 A1 EP 3143167A1 EP 14729806 A EP14729806 A EP 14729806A EP 3143167 A1 EP3143167 A1 EP 3143167A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polyaluminum
- iron
- sinter
- treatment
- treated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the invention relates to treated iron sinter or green mix for use in a blast furnace. More particularly, the iron sinter or green mix is coated with a chemical treatment.
- metal ore agglomerates are fed to a blast furnace to heat the ore and thereby reduce metal oxides present in the ore to metal.
- the metal ore is layered and heated with metallurgical coke that also acts as a reducing agent as it is transformed into carbon monoxide by controlled combustion with air.
- the metal oxidizes into molten metal as the coke burns.
- the impurities, typically silica and undesirable metal oxides, in the ore form a layer of liquid slag that may be removed before the molten metal is poured.
- Binders or fluxes, such as lime and calcium may also be added to aid in slag formation.
- the metal ore agglomerates may be fed to the blast furnace as a "green mix."
- green mix is a term of art used to describe the iron- containing material used to produce iron sinter.
- Green mix usually comprises a combination of raw iron ore powder, iron sinter, iron fines, iron dust, and recycled iron fines and dust.
- Other materials may also be included in the green mix, such as coke, fluxes, and binder.
- Fluxes may include dolomite and binder may include lime.
- the iron sinter is essentially the green mix comprising raw ore powder, agglomerates and metallurgical waste heated to fuse into a porous mass with little change in the chemical properties of the raw iron ore.
- the resulting product or "sinter” is generally an irregular nodule of metal frequently referred to as “sinter balls" with a diameter ranging from about 3-12 mm.
- the sinter may be further processed into larger agglomerates in the form of pellets or briquettes. Sinter improves the efficiency of blast furnaces by reducing the amount of ore powder or dust. Ore dust and powder may hinder CO gas distribution throughout the furnace, increase fuel consumption, lower the production capacity, and lower the quality of the metal product.
- the sinter should not be easily friable as it is transported or loaded into the blast furnace.
- the sinter is typically the largest weight-bearing layer in a blast furnace, thus it should have a mechanical strength to withstand the weight without disintegrating back into powder.
- low-temperature reduction of iron ore is avoided as it can increase dust formation and reduce the quality of the pig iron.
- high quality sinter is not easily friable and resists reduction at temperatures below 550 °C.
- An important metric in measuring sinter quality is the Reduction Degradation Index ("RDI"). Sinter with a low RDI generally has good mechanical strength and reduces at temperatures above 550 °C.
- the method may comprise coating an iron sinter with a polyaluminum treatment to a form treated iron sinter.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- a method of making iron sinter from a treated green mix comprises coating a green mix with a polyaluminum treatment to form a treated green mix.
- the treated green mix may be heated to form an iron sinter.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- the green mix may comprise at least one material selected from the group consisting of iron ore, iron fines, iron dust, recycled iron fines, recycled iron dust, and combinations thereof.
- an iron sinter treated with a polyaluminum treatment is disclosed.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- the treated iron sinter may have an improved Reduction Degradation Index (RDI) as compared to untreated iron sinter.
- RDI Reduction Degradation Index
- the iron in the iron sinter may chemically reduce above 550 °C.
- a method of smelting iron is disclosed.
- the method may comprise using an iron sinter treated with a polyaluminum treatment.
- the smelting method may further comprise using a green mix treated with a polyaluminum treatment.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- Fig. 1 shows the RDI of iron sinter at varied dosages of PACH.
- the method may comprise coating an iron sinter with a polyaluminum treatment to form a treated iron sinter.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- Suitable polyaluminum salts include, but are not limited to basic salts with one or more hydroxyl groups.
- An exemplary basic salt is polyaluminum chlorohydrate with the formula A1 2 C1(0H) 5 (anhydrous) or A1 2 C1(0H) 5 2H 2 0 (hydrous).
- Suitable polyaluminum salts may also include double or complex salts wherein more than one type of anion is present.
- Exemplary complex salts include hydrated aluminum chlorosulfate (AlS04Cl6'7H 2 0) and the basic complex salt, polyaluminum
- the polyaluminum salt may have a formula:
- Suitable polyaluminum salts include, but are not limited to, polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum silicate sulfate (PASS), polyaluminum silicate chloride (PASC), polyaluminum nitrate (PAN), polyaluminum bromide (PAB), polyaluminum fluoride (PAF), and polyaluminum iodide (PAI).
- PAC polyaluminum chloride
- PACH polyaluminum chlorohydrate
- PES polyaluminum chlorosulfate
- PAS polyaluminum sulfate
- PASS polyaluminum silicate sulfate
- PASC polyaluminum silicate chloride
- PAN polyaluminum nitrate
- PAB polyaluminum bromide
- At least one polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- PAC polyaluminum chloride
- PACH polyaluminum chlorohydrate
- PES polyaluminum chlorosulfate
- PAS polyaluminum sulfate
- PAN polyaluminum nitrate
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chhlorohydrate (PACH) with a formula Al n Cl(3n- m)(OH)m, wherein m may range from 1 to 7 and n may range from 1 to 12.
- the polyaluminum salt may be polyaluminum chlorohydrate PACH dihydrate with a formula A1 2 C1(0H) 5 -2H 2 0.
- the polyaluminum treatment may be an aqueous solution comprising a polyaluminum salt as described above.
- the concentration of the polyaluminum salt in the aqueous solution may range from about 10 wt% to about 90 wt % of the polyaluminum salt based on a total weight of the polyaluminum treatment.
- the balance may comprise water.
- the polyaluminum treatment may comprise 50 wt% polyaluminum salt and 50 wt% water.
- the concentration of polyaluminum salt in the aqueous solution may range from about 0.01 to about 500 grams per liter (g/1).
- the concentration of the polyaluminum treatment to the iron sinter may range from about 1 gram to about 200 grams per metric ton (g/ton). In another embodiment, a concentration of the polyaluminum treatment to the iron sinter may range from about 10 to about 100 grams per metric ton. In yet another embodiment, the concentration may range from about 50 to about 90 grams per metric ton (g/ton).
- the polyaluminum treatment is particularly useful in preparing iron sinter, but may also be useful in preparing metal sinter from other types of metal ore.
- the iron sinter produced using the polyaluminum treatment has an improved
- the iron sinter produced using the polyaluminum treatment may chemically reduce at temperatures above about 550 °C and/or have an RDI of less than about 30.
- a method of making an iron sinter from a treated green mix comprises coating a green mix with a polyaluminum treatment to form a treated green mix.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt as described above.
- the treated green mix may then be heated to form an iron sinter.
- the concentration of the polyaluminum treatment to the green mix may range from about 1 gram to about 200 grams per metric ton (g/ton).
- the green mix may comprise at least one material selected from the group consisting of iron ore, iron fines, iron dust, recycled iron fines, recycled iron dust, and combinations thereof.
- the green mix treated by coating it with a polyaluminum treatment may be used in any iron sintering process anticipated by those of ordinary skill in the art and is not limited to the specific sintering methods disclosed herein.
- the treated green mix may produce an improved iron sinter as described above.
- the polyaluminum treatment may be an aqueous solution supplied from a continuously stirred storage tank equipped with pipes, one or more spray nozzles, and a pump.
- the green mix may be on a conveyor belt that passes in close proximity to the spray nozzles such that as the green mix passes past the nozzles, it is coated with the polyaluminum treatment sprayed out of the nozzles.
- the coated green mix may then be charged into a sinter machine.
- the sinter machine may comprise an ignition zone and a soaking zone.
- the coated green mix may be fed to the ignition zone and heated at temperatures ranging from about 1150 to about 1,250 °C and then be transferred to the soaking zone and heat soaked at temperatures ranging from about 800 °C to about 1,000 °C thereby producing an iron sinter.
- the polyaluminum treatment may be added to the mixing process used to produce the green mix.
- the polyaluminum treatment may be in solution as described above, or it may be added to the green mix in dry or powdered form.
- the polyaluminum treatment may be added to the mixing process similarly in manner to other additives added at the mixing stage or in any manner anticipated by those of ordinary skill in the art.
- iron sinter may be treated by simply spraying already prepared iron sinter with a polyaluminum treatment.
- polyaluminum treatment may be sprayed onto the iron sinter as described above. Iron sinter treated using this method is suitable for use in smelting iron without further processing.
- an iron sinter treated with a polyaluminum treatment is disclosed.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt as described above.
- At least one polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate (PACH) with a formula Al n Cl( 3n -m)(OH)m, wherein m may range from 1 to 7 and n may range from 1 to 12.
- the concentration of the polyaluminum treatment to the iron sinter may range from about 1 gram to about 200 grams per metric ton (g/ton). In another embodiment, a concentration of the polyaluminum treatment to the iron sinter may range from about 10 to about 100 grams per metric ton. In yet another embodiment, the concentration may range from about 50 to about 90 grams per metric ton (g/ton).
- the treated iron sinter may have an improved Reduction Degradation Index (RDI) as compared to untreated iron sinter.
- RDI Reduction Degradation Index
- the iron in the iron sinter may chemically reduce above 550 °C and/or have an RDI of less than about 30.
- the iron sinter used may be treated with a polyaluminum treatment as it is fed to the smelter.
- the iron sinter may be treated using the methods described above. For example, if the iron sinter is fed to the smelter using a conveyor, the iron sinter may be sprayed and coated with the polyaluminum treatment as the sinter passes past nozzles located in close proximity to the conveyor.
- the iron sinter may have been spray coated upstream of the smelter feed conveyor, for example as the sinter left the sintering process or as the sinter was being transferred for storage or transport.
- the iron sinter used may have been prepared from iron ore or green mix that was treated with the polyaluminum treatment prior to sintering as described above.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt as described above.
- at least one polyaluminum salt may be selected from the group consisting of
- polyaluminum chloride PAC
- polyaluminum chlorohydrate PACH
- polyaluminum chlorosulfate PES
- polyaluminum sulfate PAS
- polyaluminum nitrate PAN
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate (PACH) with a formula Al n Cl(3n-m)(OH)m, wherein m may range from 1 to 7 and n may range from 1 to 12.
- the concentration of the polyaluminum treatment to the iron sinter may range from about 1 gram to about 200 grams per metric ton (g/ton). In another embodiment, a concentration of the polyaluminum treatment to the iron sinter may range from about 10 to about 100 grams per metric ton. In yet another embodiment, the concentration may range from about 50 to about 90 grams per metric ton (g/ton).
- the smelting method may further comprise using a green mix treated with a polyaluminum treatment.
- the polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt as described above.
- at least one polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate (PACH) with a formula Al n Cl( 3n -m)(OH)m, wherein m may range from 1 to 7 and n may range from 1 to 12.
- PACH hydrous polyaluminum chlorohydrate
- the tube furnace was purged with an argon-hydrogen gas mixture for 10 minutes.
- the argon- hydrogen gas flowrate was then maintained at about 1-2 L/min.
- the coated sinter was then heated at a ramp rate of 600 °C/2 hours, and then maintained at 600 °C for 30 minutes.
- the treated sinter was then removed from the furnace and allowed to cool to room temperature.
- the sinter was weighed again to obtain a first weight (mi). The sinter was then shaken with a mechanical shaker for 15 minutes and then placed on a 6.33 mm sieve. The weight of the sinter was measured to obtain a second weight ⁇ mi). The RDI at 6.33 mm was then calculated according to the formula:
- a method of preparing a treated iron sinter using a polyaluminum treatment comprising at least one anhydrous and/or hydrous polyaluminum salt is disclosed.
- the method may comprise A) treating a green mix with the polyaluminum treatment to form a treated green mix and heating the treated green mix to form the treated iron sinter or B) treating an iron sinter with a polyaluminum treatment to form the treated iron sinter.
- At least one polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate PACH with a formula Al n Cl( 3n -m)(OH)m, wherein m ranges from 1 to 7 and n ranges from 1 to 12.
- the concentration of the polyaluminum treatment to the green mix or iron sinter may range from about 1 gram to about 200 grams per metric ton (g/ton).
- the method may comprise A) treating a green mix with the polyaluminum treatment to form a treated green mix and heating the treated green mix to form the treated iron sinter.
- the method may comprise B) treating an iron sinter with a polyaluminum treatment to form the treated iron sinter.
- the method may comprise both A) and B).
- the green mix may comprise at least one member selected from the group consisting of iron ore, iron fines, iron dust, recycled iron fines, recycled iron dust, and combinations thereof.
- an iron sinter treated with a polyaluminum treatment may comprise at least one anhydrous and/or hydrous polyaluminum salt.
- the polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate PACH with a formula Al n Cl( 3n -m)(OH)m, wherein m ranges from 1 to 7 and n ranges from 1 to 12.
- the iron sinter may have been treated using a method wherein the concentration of the polyaluminum treatment to the iron sinter may range from about 1 gram to about 200 grams per metric ton (g/ton).
- the treated iron sinter may have an improved Reduction Degradation Index (RDI) as compared to untreated iron sinter.
- RDI Reduction Degradation Index
- the iron in the treated iron sinter may chemically reduce above 550 °C.
- the treated iron sinter may have an improved RDI as compared to untreated iron sinter and the iron in the treated iron sinter may chemically reduce above 550 °C.
- a method of smelting iron using a treated iron sinter is disclosed.
- the treated iron sinter may be treated with a polyaluminum treatment comprising at least one anhydrous and/or hydrous polyaluminum salt.
- the polyaluminum treatment may have the formula:
- At least one polyaluminum salt may be selected from the group consisting of polyaluminum chloride (PAC), polyaluminum chlorohydrate (PACH), polyaluminum chlorosulfate (PACS), polyaluminum sulfate (PAS), polyaluminum nitrate (PAN), and combinations thereof.
- the polyaluminum salt may be anhydrous and/or hydrous polyaluminum chlorohydrate PACH with a formula Al n Cl(3n-m)(OH) m , wherein m ranges from 1 to 7 and n ranges from 1 to 12.
- the concentration of the polyaluminum treatment to the iron sinter ranges from about 1 gram to about 200 grams per metric ton (g/ton).
- the method may further comprise using a green mix treated with the polyaluminum treatment to prepare the treated iron sinter.
- the method may further comprise forming an iron sinter and subsequently treating the iron sinter with the polyaluminum treatment to form the treated iron sinter.
- the method may comprise using both a green mix and iron sinter that have been treated with the polyaluminum treatment.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2014/037677 WO2015174957A1 (en) | 2014-05-12 | 2014-05-12 | Treatments for iron sinter or green mix |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3143167A1 true EP3143167A1 (en) | 2017-03-22 |
Family
ID=50933529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14729806.1A Withdrawn EP3143167A1 (en) | 2014-05-12 | 2014-05-12 | Treatments for iron sinter or green mix |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3143167A1 (en) |
KR (1) | KR20170005439A (en) |
CN (1) | CN106460088A (en) |
WO (1) | WO2015174957A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7003782B2 (en) * | 2018-03-27 | 2022-02-04 | 日本製鉄株式会社 | Reduced pulverization property management device, reduced pulverization property management program, and reduced pulverization property management method |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1793390A (en) * | 2005-12-30 | 2006-06-28 | 王全福 | Inhibiting powdering agent for sintering ore |
JP4816119B2 (en) * | 2006-02-09 | 2011-11-16 | Jfeスチール株式会社 | Method for producing sintered ore |
JP5098248B2 (en) * | 2006-08-03 | 2012-12-12 | 新日鐵住金株式会社 | Granulation method of iron-containing dust collection dusts for iron making |
JP5105810B2 (en) * | 2006-09-20 | 2012-12-26 | 株式会社日向製錬所 | Rotary kiln dust granulation method |
CN102333894A (en) * | 2009-02-26 | 2012-01-25 | 新日本制铁株式会社 | Method for treating sintering granules |
CN102234718B (en) * | 2010-04-23 | 2012-09-19 | 宝山钢铁股份有限公司 | Accessory ingredient for reducing low-temperature reduction powdering index of lump ore and use method thereof |
CN202181330U (en) * | 2011-06-28 | 2012-04-04 | 鞍钢股份有限公司 | Halide spraying device for finished sintering ores |
-
2014
- 2014-05-12 CN CN201480078814.5A patent/CN106460088A/en active Pending
- 2014-05-12 KR KR1020167033731A patent/KR20170005439A/en not_active Application Discontinuation
- 2014-05-12 EP EP14729806.1A patent/EP3143167A1/en not_active Withdrawn
- 2014-05-12 WO PCT/US2014/037677 patent/WO2015174957A1/en active Application Filing
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2015174957A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN106460088A (en) | 2017-02-22 |
KR20170005439A (en) | 2017-01-13 |
WO2015174957A1 (en) | 2015-11-19 |
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18D | Application deemed to be withdrawn |
Effective date: 20201203 |