EP0604452B2 - Ore pelletisation - Google Patents

Ore pelletisation Download PDF

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Publication number
EP0604452B2
EP0604452B2 EP92916647A EP92916647A EP0604452B2 EP 0604452 B2 EP0604452 B2 EP 0604452B2 EP 92916647 A EP92916647 A EP 92916647A EP 92916647 A EP92916647 A EP 92916647A EP 0604452 B2 EP0604452 B2 EP 0604452B2
Authority
EP
European Patent Office
Prior art keywords
polymer
weight
ore
guar gum
particulate
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.)
Expired - Lifetime
Application number
EP92916647A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0604452A1 (en
EP0604452B1 (en
Inventor
John Rodney 2 Leyburn Avenue Hipperholme Field
Anthony Peter Allen
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.)
Ciba Specialty Chemicals Water Treatments Ltd
Original Assignee
Ciba Specialty Chemicals Water Treatments Ltd
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Filing date
Publication date
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Application filed by Ciba Specialty Chemicals Water Treatments Ltd filed Critical Ciba Specialty Chemicals Water Treatments Ltd
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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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic

Definitions

  • This invention relates to ore pelletisation processes which comprise forming an intimate mixture of particulate ore and particulate binder in the presence of moisture, forming green pellets by agitation of the mixture (for instance by rolling or tumbling) and firing the green pellets to produce ore pellets.
  • Bentonite has been a widely used particulate binder but numerous proposals have been made to use synthetic or natural organic polymers.
  • soluble starches One class of natural polymers that has been used are various soluble starches. Another class are soluble cellulose derivatives which are usually esters (especially carboxymethyl cellulose) or ethers (especially hydroxyethyl cellulose). Another class are soluble gums such as xanthan gum or guar gum. It has been proposed to use mixtures of binder clay (bentonite) with the polymers. For instance Clum et al in Mining Engineers 1978 (NY) 30(1), page 53 show the results obtained using binders comprising guar gum, hydroxyethyl cellulose, polyoxyethylene oxide, and also bentonite.
  • binder clay bentonite
  • the particulate binder may comprise synthetic polymer particles often having a size up to 300 ⁇ m formed by polymerisation of water soluble, ionic, ethylenically unsaturated monomer or monomer blend to form water soluble polymer particles.
  • the monomer blend is free of cross linking agent, so as to avoid cross linking with the consequential risk of insolubility.
  • EP-A-225171 the use, as particulate binder, of water soluble synthetic polymer that has intrinsic viscosity 3 to 16dl/g and that is an anionic polymer and we describe in EP 0288150 the use of cationic polymers.
  • pelletisation binder of soluble anionic synthetic polymer has several advantages over the use of bentonite, but it can suffer from one disadvantage in that it is difficult to achieve adequate dry strength in the ore pellets at economic dosages. Even if the dosage is increased in order to improve dry strength, there may then be other disadvantages, such as stickiness and aggregation of pellets in the drum and instability during the pelletising process.
  • particulate ore is mixed with particulate binder in the presence of moisture and the mixture is pelletised, and the particulate binder is a dry powdered particulate composition and is a blend of 1 part ionic synthetic water soluble polymer with from 2 to 30 parts of soluble natural polymer which is guar gum.
  • parts are parts by weight.
  • the gum may have been treated in known manner to increase its solubility, for instance it may be a phosphated guar gum.
  • the amount of synthetic polymer is generally at least 0.005% and usually at least 0.01% (by weight of the total mix) but the amount is generally not more than 0.1% and is frequently less, for instance below 0.06%. Amounts of 0.01 to 0.04% are often suitable.
  • the total amount of water soluble synthetic and guar gum used in the invention is usually at least 0.03% and often at least 0.05%. It is generally undesirable for it to be more than 0.3% and it is usually below 0.2%. Amounts of 0.05 to 0.1 or 0.15% are often suitable.
  • the amount of the guar gum is usually at least 0.02% and generally at least 0.04%. Although the amount can be, for instance, 0.2% or even more it is preferably below 0.15% and generally below 0.1%. It is very surprising that these low amounts of guar gum give a beneficial effect, since it is usually necessary to use relatively large amounts, typically 0.4% or more, to obtain beneficial binding results when using natural polymer.
  • the amount of the guar gum is generally (per part by weight of the soluble synthetic polymer) at least 3 parts and frequently at least 5 or 6 parts. It is normally below 15 parts, and is generally below 10 parts.
  • the binder preferably also includes sodium carbonate or other water soluble monomeric additive of the type described in EP 225171.
  • the amount of this is generally from 0.2 to 2 parts, often around 0.7 to 1.5 parts, per part by weight of the synthetic polymer.
  • Preferred binders comprise 1 part by weight soluble synthetic polymer, 0.7 to 1.3 parts by weight sodium carbonate and 2 to 12 parts by weight guar gum.
  • the components of the binder may be premixed or they may be supplied to the pelletising process separately but preferably substantially simultaneously.
  • the total amount of binder (water soluble synthetic polymer plus natural polymer plus sodium carbonate or other salt) is typically in the range 0.03 to 0.3%, often around 0.05 to 0.2%.
  • the polymer can be cationic, for instance as described in EP 0288150, but is generally anionic as in EP 225171.
  • the amount by weight of sodium acrylate or other anionic monomer is generally in the range 5 to 90% by weight, with the balance preferably being acrylamide. It is normally preferred for the polymer to be a copolymer of acrylamide with 10 to 40%, often 15 to 30%, sodium acrylate.
  • Intrinsic viscosity can be in the range 2 or 3 to 16dl/g, often in the range 5 to 12dl/g, but in some instances can be higher, for instance up to 25dl/g.
  • the soluble synthetic polymer should be wholly linear in which event it will normally have been polymerised in the absence of any added cross linking agent.
  • the synthetic polymer can be a water soluble, partly cross linked polymer.
  • the amount of cross linking agent should be selected so that it is insufficient to render the polymer particles predominantly water insoluble but sufficient to give a useful benefit, particularly an increase in the dry strength of the ore pellets, provided that the amount is such that the particles still behave predominantly as water soluble polymer particles, for instance as regards their film-forming and rheological characteristics.
  • the amount of cross linking agent typically is 5 to 50ppm, preferably 7 to 20ppm when the IV is 2 to 7dl/g and 2 to 30ppm, preferably 5 to 15ppm, when IV is 7 to 16dl/g. These IV's are measured on the polymer in the absence of cross linking agent and the amounts of cross linking agent are calculated as methylene bis acrylamide. Different, generally larger, amounts will be required to obtain the same rheology and solubility characteristics using other cross linkers. Generally the amount of cross linking agent is below 18ppm, measured as methylene bis acrylamide.
  • IV values are determined by conventional single point IV measurement in dl/g at 20°C.
  • the components of the particulate binder used in the invention are supplied as a dry powdered particulate composition.
  • the particles may be aggregates, for instance as described in EP 0326382.
  • the size of the binder particles is normally below 300 ⁇ m, generally below 200 ⁇ m and preferably below 150 ⁇ m, but is generally above 20 ⁇ m.
  • the particulate ore is preferably an iron ore but can be any other mineral ore that is capable of being pelletised, for instance a zinc ore.
  • the materials and process conditions can be broadly as described in EP 225171, except that the binder must include the defined large amount of guar gum. Bentonite can be used as part of the binder.
  • a combination of an anionic polyacrylamide blend with sodium carbonate and guar gum gives acceptable green properties whilst increasing the dry strength over that obtained with guar gum on its own.
  • the dry strength has been increased by 24.0 and 34.0% respectively as a result of blending the guar gum with the synthetic polymer.
  • the addition of the synthetic polymer to the guar gum increases the dry strength attainable using a similar amount of the natural polymer in the absence of the synthetic polymer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Glanulating (AREA)
EP92916647A 1991-08-02 1992-08-03 Ore pelletisation Expired - Lifetime EP0604452B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB91166983 1991-08-02
GB919116698A GB9116698D0 (en) 1991-08-02 1991-08-02 Ore pelletisation
PCT/GB1992/001432 WO1993003189A2 (en) 1991-08-02 1992-08-03 Ore pelletisation

Publications (3)

Publication Number Publication Date
EP0604452A1 EP0604452A1 (en) 1994-07-06
EP0604452B1 EP0604452B1 (en) 1998-04-15
EP0604452B2 true EP0604452B2 (en) 2001-05-16

Family

ID=10699401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92916647A Expired - Lifetime EP0604452B2 (en) 1991-08-02 1992-08-03 Ore pelletisation

Country Status (9)

Country Link
EP (1) EP0604452B2 (en, 2012)
JP (1) JPH06509390A (en, 2012)
AU (1) AU669852B2 (en, 2012)
BR (1) BR9206327A (en, 2012)
CA (1) CA2114438C (en, 2012)
GB (1) GB9116698D0 (en, 2012)
IN (1) IN180821B (en, 2012)
MX (1) MX9204512A (en, 2012)
WO (1) WO1993003189A2 (en, 2012)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9116700D0 (en) * 1991-08-02 1991-09-18 Allied Colloids Ltd Ore pelletisation
CA2082128C (en) * 1991-11-07 2002-12-31 Henricus R. G. Steeghs Process for agglomerating particulate material and products made from such processes
GB9721085D0 (en) 1997-10-03 1997-12-03 Allied Colloids Ltd Mineral palletisation
US20190153561A1 (en) * 2016-06-20 2019-05-23 Hppe, Llc Enhanced binders for iron ore pelleting and cement adhesive materials

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203854A2 (en) † 1985-05-21 1986-12-03 Union Carbide Corporation An improved process for agglomerating ore concentrate utilizing emulsions of polymer binders or dry polymer binders
US4751259A (en) † 1987-08-05 1988-06-14 Nalco Chemical Company Compositions for iron ore agglomeration
EP0255171B1 (de) † 1986-07-26 1991-02-27 KOLBENSCHMIDT Aktiengesellschaft Lenkrad

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893847A (en) * 1970-08-07 1975-07-08 Catoleum Pty Ltd Composition of matter and process
US4767449A (en) * 1985-05-21 1988-08-30 Union Carbide Corporation Process for agglomerating ore concentrate utilizing clay and dispersions of polymer binders or dry polymer binders
US4728537A (en) * 1985-11-29 1988-03-01 Allied Colloids Limited Ore pelletization
US5000783A (en) * 1988-07-28 1991-03-19 Oriox Technologies, Inc. Modified native starch base binder for pelletizing mineral material
GB8830383D0 (en) * 1988-12-30 1989-03-01 Allied Colloids Ltd Process and composition for pelletising particulate materials
GB8918913D0 (en) * 1989-08-18 1989-09-27 Allied Colloids Ltd Agglomeration of particulate materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203854A2 (en) † 1985-05-21 1986-12-03 Union Carbide Corporation An improved process for agglomerating ore concentrate utilizing emulsions of polymer binders or dry polymer binders
EP0255171B1 (de) † 1986-07-26 1991-02-27 KOLBENSCHMIDT Aktiengesellschaft Lenkrad
US4751259A (en) † 1987-08-05 1988-06-14 Nalco Chemical Company Compositions for iron ore agglomeration

Also Published As

Publication number Publication date
EP0604452A1 (en) 1994-07-06
AU2380292A (en) 1993-03-02
WO1993003189A3 (en) 1993-03-18
MX9204512A (es) 1993-04-01
CA2114438A1 (en) 1993-02-18
EP0604452B1 (en) 1998-04-15
WO1993003189A2 (en) 1993-02-18
CA2114438C (en) 2007-02-27
BR9206327A (pt) 1995-04-11
AU669852B2 (en) 1996-06-27
JPH06509390A (ja) 1994-10-20
IN180821B (en, 2012) 1998-03-21
GB9116698D0 (en) 1991-09-18

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