EP0604452A1 - Bouletage du minerai - Google Patents

Bouletage du minerai

Info

Publication number
EP0604452A1
EP0604452A1 EP92916647A EP92916647A EP0604452A1 EP 0604452 A1 EP0604452 A1 EP 0604452A1 EP 92916647 A EP92916647 A EP 92916647A EP 92916647 A EP92916647 A EP 92916647A EP 0604452 A1 EP0604452 A1 EP 0604452A1
Authority
EP
European Patent Office
Prior art keywords
polymer
soluble
ore
process according
weight
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.)
Granted
Application number
EP92916647A
Other languages
German (de)
English (en)
Other versions
EP0604452B2 (fr
EP0604452B1 (fr
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
Allied Colloids Ltd
Ciba Specialty Chemicals Water Treatments Ltd
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
Family has litigation
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Application filed by Allied Colloids Ltd, Ciba Specialty Chemicals Water Treatments Ltd filed Critical Allied Colloids Ltd
Publication of EP0604452A1 publication Critical patent/EP0604452A1/fr
Application granted granted Critical
Publication of EP0604452B1 publication Critical patent/EP0604452B1/fr
Publication of EP0604452B2 publication Critical patent/EP0604452B2/fr
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Expired - Lifetime legal-status Critical Current

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
    • 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 I6dl/g and that is an anionic polymer and we describe in EP 0288150 the use of cationic polymers.
  • the use as 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. Similarly, the use of natural polymers alone has not proved entirely satisfactory since they may not lead to the optimum combination of green strength, dry strength and drop number.
  • particulate ore is mixed with particulate binder in the presence of moisture and the mixture is pelletised, and the particulate binder comprises a blend of 1 part ionic synthetic water soluble polymer with from 2 to 30 parts of a soluble natural polymer selected from soluble gums, soluble starches and soluble cellulose derivatives.
  • a soluble natural polymer selected from soluble gums, soluble starches and soluble cellulose derivatives.
  • parts are parts by weight.
  • the natural polymer can be, for instance, a cellulose ether such as hydroxyethyl cellulose, a cellulose ester such as carboxymethyl cellulose, a soluble starch, or xanthan gum, but it is preferably soluble guar gum.
  • 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 water soluble natural polymer 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 natural polymer 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 natural polymer 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 natural polymer 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. However it can be desirable to use larger amounts of sodium acrylate, e.g., 50 to 80%, typcially around 70%.
  • 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 7 l/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 I8ppm, measured as methylene bis acrylamide. In this specification, IV values are determined by conventional single point IV measurement in dl/g at 20°C.
  • Some or all of the components of the particulate binder used in the invention can be supplied as a dispersion of particles in oil, but it is generally preferred for them to be 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 5 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 10 of the binder.
  • Example 1 pelletisation processes were conducted as in the examples of EP 225171 using various combinations of guar gum and anionic polymer formed as in EP 225171. The results were as follows. 15 Example 1
  • the dry strength has 35 been increased by 24.0 and 34.0% respectively as a result of blending the guar gum with the synthetic polymer. k
  • 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)
  • Crushing And Pulverization Processes (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Glanulating (AREA)

Abstract

Dans un procédé de bouletage de minerai de fer dans lequel le minerai particulaire est mélangé à un liant polymère particulaire en présence d'humidité et dont le mélange est bouleté, le liant particulaire est un mélange de polymère soluble dans l'eau, synthétique, ionique, tel qu'un copolymère d'acrylamide et d'acrylate de sodium ayant une viscosité intrinsèque de 2 à 16 dl/g, avec une plus grande quantité d'un polymère naturel soluble, en particulier la gomme de guar.
EP92916647A 1991-08-02 1992-08-03 Bouletage du minerai Expired - Lifetime EP0604452B2 (fr)

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 (fr) 1991-08-02 1992-08-03 Bouletage du minerai

Publications (3)

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

Family

ID=10699401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92916647A Expired - Lifetime EP0604452B2 (fr) 1991-08-02 1992-08-03 Bouletage du minerai

Country Status (9)

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

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 (fr) * 1991-11-07 2002-12-31 Henricus R. G. Steeghs Procede permettant d'agglomerer des particules et produits fabriques a l'aide de ces procedes
GB9721085D0 (en) * 1997-10-03 1997-12-03 Allied Colloids Ltd Mineral palletisation
CN109311749A (zh) * 2016-06-20 2019-02-05 高性能聚乙烯有限责任公司 用于铁矿石造粒和水泥粘合剂材料的增强粘结剂

Family Cites Families (9)

* 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
CA1332515C (fr) † 1985-05-21 1994-10-18 Gregory John Dornstauder Procede pour agglomerer du concentre de minerai a l'aide d'emulsions de liants polymeriques ou de liant polymerique sec
US4728537A (en) * 1985-11-29 1988-03-01 Allied Colloids Limited Ore pelletization
DE3625372A1 (de) † 1986-07-26 1988-02-04 Kolbenschmidt Ag Lenkrad
US4751259A (en) † 1987-08-05 1988-06-14 Nalco Chemical Company Compositions for iron ore agglomeration
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9303189A3 *

Also Published As

Publication number Publication date
EP0604452B2 (fr) 2001-05-16
CA2114438A1 (fr) 1993-02-18
JPH06509390A (ja) 1994-10-20
IN180821B (fr) 1998-03-21
WO1993003189A3 (fr) 1993-03-18
AU669852B2 (en) 1996-06-27
EP0604452B1 (fr) 1998-04-15
AU2380292A (en) 1993-03-02
MX9204512A (es) 1993-04-01
CA2114438C (fr) 2007-02-27
GB9116698D0 (en) 1991-09-18
WO1993003189A2 (fr) 1993-02-18
BR9206327A (pt) 1995-04-11

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