WO2009109024A1 - Composition de liant servant à agglomérer du minerai de fer - Google Patents

Composition de liant servant à agglomérer du minerai de fer Download PDF

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Publication number
WO2009109024A1
WO2009109024A1 PCT/BR2009/000057 BR2009000057W WO2009109024A1 WO 2009109024 A1 WO2009109024 A1 WO 2009109024A1 BR 2009000057 W BR2009000057 W BR 2009000057W WO 2009109024 A1 WO2009109024 A1 WO 2009109024A1
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WO
WIPO (PCT)
Prior art keywords
binder
binder composition
present
bentonite
pellets
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.)
Ceased
Application number
PCT/BR2009/000057
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English (en)
Inventor
Floriano Wending
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bentonit Uniao Nordeste Sa
Original Assignee
Bentonit Uniao Nordeste Sa
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bentonit Uniao Nordeste Sa filed Critical Bentonit Uniao Nordeste Sa
Publication of WO2009109024A1 publication Critical patent/WO2009109024A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic

Definitions

  • the present invention refers to a binding composition for use in pelletizing minerals, more particularly iron ore, and its respective manufacturing method for use in pelletizing processes.
  • This sinter feed was soon began to be used in a range that goes from 100 mesh up to 6.35 mm in the sintering processes and thereafter the portion of powder less than 100 mesh began to be used in pelletizing proces- ses that transform the mineral powder into pellets.
  • pellets have been used in the production of pellets, be they compact minerals or not, and being pure or mixed hematitic or magnetic, or containing iron-hydrated minerals.
  • the known processes used commercialized to manufacture pellets are continuous, in which an iron ore concentrate pulp is vacuum filtered in rotary disk filters where the cake produced should have a suitable humidity for pelletizing. In the condition of controlled humidity, the concentrate receives a suitable amount of binder, is intensively mixed and then sent to pelletizing disks or drums to produce green pellets.
  • the green pellets thus produced are sent to a firing oven on conveyor belts and, therefore, must have sufficiently high mechanical resistance to withstand shocks and falls that may occur during transport. Consequently, the pellets should arrive at the furnace with their physical integrity intact so as not to compromise the physical quality of the fired pellets.
  • the resistance of the green pellets depends on many factors that are directly related to iron ore and to materials that are added to aggregate chemical and/or physical properties to the green pellets, as well as to guarantee the physical and chemical properties of the fired pellets in close harmony with the steel manufacturing processes where they will be used.
  • the presence of silica in the feed to be pelletized entails drawbacks mainly concerning the quality of the pellets of direct reduction and the higher the content of silica in the material to be pelletized, the greater the need to treat this material to reduce the silica.
  • the binder presently known and most used in pelletizing iron ore comprises a silico-aluminous clay mineral called bentonite and which contains about 50% to 60% of silica and 13% to 17% of alumina depending on other characteristics of the clay.
  • bentonite as binder in the formation of pellets causes an increase in the content of silica and alumina, which leads to a drop in total iron content of the pellet, this being the material of economic interest and for which the iron ore pellets have minimum specification limits for acceptability on the market.
  • organic binders which are free of silica and which have the objective of totally substituting the bentonite in pelletizing processes whereby avoiding the increase of the silica in the pellet.
  • organic binders are basically manufactured with industrial polymers originating from vegetable cellulose or polyacrylamide-based industrial polymers.
  • Document US 4863512 discloses a binder for minerals comprising, among other components, a metal alkaline salt, carboxymethyl cellulose, together with a sodium tripolyphosphate.
  • This type of binder was ideali- zed to substitute bentonite but was not successful because it contained sodium tripolyphosphate which is a phosphorous contaminant that is highly harmful in steel production processes and for the steel itself.
  • This type of binder was rejected by the presence of phosphate which if not extracted during the process causes serious weakening of the structure of the resultant steel.
  • Document RU 2245930 describes a binding composition containing bentonite and an amount by weight of a polysaccharide as bentonite activator.
  • a polysaccharide-based polyelectrolyte polymer is added to the iron ore concentrate in the range of 1% to 5% and it is disclosed that this amount should vary with the specific surface of the mineral concentrate. Considering the additions of 1% to 5%, it can be said that the polymer besides being used in variable amounts according to the specific surface of the mineral, has an excessively high use proportion.
  • document RU 2227165 refers to a binding composition that comprises, in addition to bentonite, a compound containing sodium and a water-soluble polymer.
  • the binder contains bentonite, a compound containing sodium and a soluble polymer that can be cellulose ether, starch or polysaccharide or polyacrylamides in water at a vis- cosity of 5000 to 20000 mPa.s.
  • the composition of the binder may contain a sodium compound that can vary from 0.1% to 6% and a water-soluble polymer that can vary from 0.1% to 3%. Under these conditions, the concentration of bentonite in the binder can vary from 91.0% to 99.8%.
  • Document GB 1383368 discloses a mixture for sintering and pel- letizing minerals in which the polysaccharide added to the mineral before sintering is selected from alginates, pregelatinized starches and galactomannan thickeners. An inorganic binder such as bentonite can also be present.
  • a new conception for a binder is proposed, designed to achieve a binder that contains bentonite together with other organic and/or mineral components and that displays the same or even better pelletizing characteristics that those of the organic or inorganic binders of the current state of the art.
  • the bentonite exists in percentage quantities over 50% but tests show that its use in the process only causes a minimal increase in the silica content of the pellet.
  • the objective of the present invention is to provide a binder for pelletizing minerals and, more specifically, iron ore, which allows the use of bentonite together with other binders, without the drawbacks associated to the increase of silica in the pellets when using pure bentonite.
  • the present invention refers to binder compositions for use in pelletizing iron ore which composition comprises, based on the total weight of the binder, at least a clay that in this case is preferably bentonite in a concentration of from 30% to 80%, and from 10% to 30% of molasses, the percentages being by weight based on the total weight of the binding composition.
  • the present invention also refers to a process for pelletizing iron ore using a binding composition as defined above as a binder added to said iron ore prior to the pelletizing step.
  • FIGS 1 to 3 present photographs of iron ore pellets obtained through the use of prior art binding compositions whereas figures 4 to 7 show pellets obtained with the binder of the present invention.
  • the present invention refers to binding formulation for use in pelletizing iron ores containing in their composition at least from 30 to 80%, by weight of bentonite based on the total weight of the binding composition, pre- ferably between 45% and 60% by weight, and from 10% to 30%, by weight based on the total weight of the binding composition of molasses.
  • composition of the present invention allowed the obtention of a binder having a considerable content of bentonite, that is, up to 60% an4 evont 80% by weight, without the showing drawbacks found in the natural bentonite binders, said drawbacks being associated with the high percentage of silica in the bentonite.
  • the inventor noted that the use of a binder compo- sition according to the present invention results in an insignificant increase of silica in the pellet when compared to the use of pure bentonite.
  • the binder composition of the present invention may preferably contain other optional components that add further advantages to the results achieved.
  • the binding composition may comprise from 0 to 10% by weight of a polysaccharide, preferably a starch polysaccharide.
  • the polysaccharide used in the present invention can be selected from the group of natural starches of corn, potato, manioc and rice.
  • Said binder composition may contain solid and water-soluble organic polymers such as anionic polyacrylamide, synthetic polymers derived from natural polysaccharides such as carboxymethyl cellulose (CMC).
  • organic polymers such as anionic polyacrylamide, synthetic polymers derived from natural polysaccharides such as carboxymethyl cellulose (CMC).
  • the binder composition of the present invention comprises a polyacrylamide, preferably linear and anionic, having a molecular weight in the range of 11 ,000,000 to 14,000,000 with reference to the carbon 12 and present in a range of 2 to 10%, preferably from 4 to 9%, by weight based on the total weight of the binder.
  • the composition may also comprise a synthetic polymer derived from natural polysaccharides such as carboxymethyl cellulose (CMC) or modified starches present in an amount of up to 10%, preferably from 4% to 8%, by weight based on the total weight of the binding mixture.
  • CMC carboxymethyl cellulose
  • Carbonates and bicarbonates of alkaline metals or soluble hydroxides from alkaline metals such as carbonates, bicarbonates or hydroxides of sodium, lithium or potassium may be present in a percentage of up to 20%, preferably from 7 to 20%, by weight of the binder.
  • a particularly preferred binder comprises:
  • Figures 1 to 3 present images of the surface finishing of the pellets produced with the binder compositions of prior art wherein figure 1 refers to a CMC-based organic binder and figures 2 and 3 to binders of pure bento- nite.
  • Figures 4 to 7 refer to pellets produced with the binders of the present invention BUN 6, BUN 7, BUN 8 and BUN 9, respectively.
  • the pellets obtained with the binder composition of the present invention present high resistance to drops, high compression also (all had dry compression above 4000 grams) and, moreover, have an extremely flat outer surface, that is, a very good surface finishing that has a highly positive influence on the physical properties of the fired pellets.
  • the photographs of figures 4 to 7 also show the surface finishing factor of the pellets as an important aspect of the quality of the pellets manufactured and show the importance of the binding characteristics to produce the desired finishing on the pellets. It was also possible to demonstrate that with the use of the binder compositions of the present invention, in spite of the high bentonite content, the increase in silica is insignificant when compared to the use of organic binders as shown in table 1.
  • the examples demonstrate a significant reduction in the sur- face humidity of the pellets as shown in table 1 particularly in examples BUN7 and BUN9.
  • pellets preferably grew in lower size ranges (from 12.5 to 9.5 mm).
  • compositions containing 0.5% of bentonite and 0.5% of molasses there was an increased tendency towards small pellets. There was no formation of sufficient pellets for physical tests and they ended up with highly irregular surfaces.
  • the pellets homogeneously grew in the ranges of 16 to 12.5 and 12.5 to 9.5 mm. Due to the lower surface humidity, said pellets presented better finishing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Glanulating (AREA)

Abstract

L'invention concerne une composition de liaison contenant de la bentonite utilisée pour lier du minerai de fer finement broyé. La composition de l'invention contient de la bentonite et des molasses. L'invention concerne également un procédé de préparation de boulettes de minerai de fer consistant à utiliser comme liant une composition contenant de la bentonite et des molasses.
PCT/BR2009/000057 2008-03-06 2009-03-06 Composition de liant servant à agglomérer du minerai de fer Ceased WO2009109024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI0801555-4 2008-03-06
BRPI0801555A BRPI0801555B1 (pt) 2008-03-06 2008-03-06 composição aglomerante para pelotização de minério de ferro e processo para pelotização de minério de ferro

Publications (1)

Publication Number Publication Date
WO2009109024A1 true WO2009109024A1 (fr) 2009-09-11

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PCT/BR2009/000057 Ceased WO2009109024A1 (fr) 2008-03-06 2009-03-06 Composition de liant servant à agglomérer du minerai de fer

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BR (1) BRPI0801555B1 (fr)
WO (1) WO2009109024A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102353760A (zh) * 2011-03-22 2012-02-15 马鞍山钢铁股份有限公司 一种膨润土质量现场快速检测方法及装置
CN102363838A (zh) * 2011-06-01 2012-02-29 刘贵堂 石灰石纤维素醚铁矿球团复合添加剂及其制备方法和应用
CN103484665A (zh) * 2013-10-14 2014-01-01 北京科技大学 采用不同粘结剂和两次成球方式制作冶金复合球团的方法
CN104263918A (zh) * 2014-10-22 2015-01-07 攀枝花钢城集团协力有限公司 冷压成型方法
WO2017223082A1 (fr) 2016-06-20 2017-12-28 Hppe, Llc Liants améliorés pour la granulation de minerai de fer et matériaux adhésifs à base de ciment
CN111020183A (zh) * 2019-12-24 2020-04-17 兰州申马节能环保科技有限公司 用于冶金冷压球团的粘结剂、包含它的冷压球团及其制备方法
CN111118300A (zh) * 2020-01-19 2020-05-08 中冶宝钢技术服务有限公司 一种除尘灰的压球成型方法
CN113637844A (zh) * 2021-07-26 2021-11-12 河南锦瀚环保科技有限公司 铁矿粉冷压球团粘结剂及其制备方法
CN115725836A (zh) * 2022-12-02 2023-03-03 中冶北方（大连）工程技术有限公司 一种球团用粘结剂及其使用方法
WO2023147263A1 (fr) * 2022-01-28 2023-08-03 Bl Technologies, Inc. Composition de liant pour le briquetage et/ou la pelletisation de fines de minerai de fer ou d'aluminium et de résidus de minerai de fer ou d'aluminium et procédés associés

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115094235B (zh) * 2022-07-08 2024-02-27 山东理工大学 冶金球团用聚合膨润土粘结剂及其制备方法和应用

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751241A (en) * 1970-12-28 1973-08-07 Bethlehem Steel Corp Method for producing weather-resistant superfluxed metallized pellets from iron-bearing fines and a superfluxed metallized pellet produced thereby
US4224119A (en) * 1979-08-10 1980-09-23 Chemetals Corporation In-cell manganese ore reduction
US4369062A (en) * 1981-09-28 1983-01-18 Strange Robert R Method of making briquettes and product
US4976977A (en) * 1989-04-10 1990-12-11 Oil-Dri Corporation Of America Pelleting agent having energy value

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751241A (en) * 1970-12-28 1973-08-07 Bethlehem Steel Corp Method for producing weather-resistant superfluxed metallized pellets from iron-bearing fines and a superfluxed metallized pellet produced thereby
US4224119A (en) * 1979-08-10 1980-09-23 Chemetals Corporation In-cell manganese ore reduction
US4369062A (en) * 1981-09-28 1983-01-18 Strange Robert R Method of making briquettes and product
US4976977A (en) * 1989-04-10 1990-12-11 Oil-Dri Corporation Of America Pelleting agent having energy value

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102353760A (zh) * 2011-03-22 2012-02-15 马鞍山钢铁股份有限公司 一种膨润土质量现场快速检测方法及装置
CN102353760B (zh) * 2011-03-22 2014-06-11 马鞍山钢铁股份有限公司 一种膨润土质量现场快速检测方法及装置
CN102363838A (zh) * 2011-06-01 2012-02-29 刘贵堂 石灰石纤维素醚铁矿球团复合添加剂及其制备方法和应用
CN103484665A (zh) * 2013-10-14 2014-01-01 北京科技大学 采用不同粘结剂和两次成球方式制作冶金复合球团的方法
CN104263918A (zh) * 2014-10-22 2015-01-07 攀枝花钢城集团协力有限公司 冷压成型方法
WO2017223082A1 (fr) 2016-06-20 2017-12-28 Hppe, Llc Liants améliorés pour la granulation de minerai de fer et matériaux adhésifs à base de ciment
CN111020183A (zh) * 2019-12-24 2020-04-17 兰州申马节能环保科技有限公司 用于冶金冷压球团的粘结剂、包含它的冷压球团及其制备方法
CN111118300A (zh) * 2020-01-19 2020-05-08 中冶宝钢技术服务有限公司 一种除尘灰的压球成型方法
CN113637844A (zh) * 2021-07-26 2021-11-12 河南锦瀚环保科技有限公司 铁矿粉冷压球团粘结剂及其制备方法
WO2023147263A1 (fr) * 2022-01-28 2023-08-03 Bl Technologies, Inc. Composition de liant pour le briquetage et/ou la pelletisation de fines de minerai de fer ou d'aluminium et de résidus de minerai de fer ou d'aluminium et procédés associés
CN115725836A (zh) * 2022-12-02 2023-03-03 中冶北方（大连）工程技术有限公司 一种球团用粘结剂及其使用方法

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Publication number Publication date
BRPI0801555B1 (pt) 2015-12-01
BRPI0801555A2 (pt) 2009-10-27

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