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EP1769091A2 - Suppression et reduction de poussiere d'oxydation de surface pour des agglomerats mineraux - Google Patents

Suppression et reduction de poussiere d'oxydation de surface pour des agglomerats mineraux

Info

Publication number
EP1769091A2
EP1769091A2 EP05772038A EP05772038A EP1769091A2 EP 1769091 A2 EP1769091 A2 EP 1769091A2 EP 05772038 A EP05772038 A EP 05772038A EP 05772038 A EP05772038 A EP 05772038A EP 1769091 A2 EP1769091 A2 EP 1769091A2
Authority
EP
European Patent Office
Prior art keywords
mineral substrate
dust suppressant
dust
oil
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.)
Pending
Application number
EP05772038A
Other languages
German (de)
English (en)
Inventor
Susan Margaret Hey
Stephen Adkins
Martin Geoffrey Neale
Paul Stocks
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
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 Ciba Specialty Chemicals Water Treatments Ltd filed Critical Ciba Specialty Chemicals Water Treatments Ltd
Publication of EP1769091A2 publication Critical patent/EP1769091A2/fr
Pending 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
    • C22B1/2406—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
    • 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 relates to a composition consisting essentially of a mineral substrate and a dust suppressant, which is adhered to the surface of the mineral substrate, and to methods of reducing dust generation of a mineral substrate by applying a dust suppressant to the surface of the mineral substrate.
  • WO 03/052149 A1 describes iron ore pellets having incorporated saturated hydrocarbons such as paraffin oils or synthetic oils in order to make the iron ore pellets resistant to abrasion, sticking, degradation and emission of dust.
  • saturated hydrocarbons such as paraffin oils or synthetic oils
  • the saturated hydrocarbons are incorporated into the iron ore pellet at 250 * O.
  • WO 2004/099452 A1 describes iron ore pellets, wherein the surface layer of the pellets is coated with polymer or synthetic oils.
  • the amount of polymer or synthetic oil is 0.14 to 1% by weight per weight pellet.
  • the polymer or oil is applied to the pellets at 250 to 300 1 O.
  • the addition of the polymer or oil is best accomplished through the preparation of the polymer or oil diluted in 50 to 80% water.
  • the dust suppressant of WO 2004/099452 A1 has the additional disadvantage that it is applied to the iron ore pellets as a preparation diluted in 50 to 80% water.
  • This aqueous dust suppressant preparation causes spitting problems when applied to the hot iron ore pellets as it instantenously boils.
  • composition of the present invention consists essentially of a mineral substrate and a dust suppressant, which is adhered to the surface of the mineral substrate, wherein the dust suppressant is a natural or synthetic triglyceride or a mixture comprising triglycerides.
  • Triglycerides are esters of glycerine and fatty acids.
  • the triglycerides are natural such as soybean oil, sunflower oil, coconut oil, palmitic oil, cottonseed oil, castor oil etc. Further triglycerides are described e.g. in F ⁇ mpp Lexikon
  • the triglyceride is selected from the group consisting of soyabean oil, sunflower oil, coconut oil, palmitic oil, cottonseed oil, and castor oil and mixtures thereof.
  • the inventive method can be applied to all mineral substrates, which can be a source of dust.
  • all known ore pellets can be used, preferably iron-ore pellets are used.
  • the amount of dust suppressant usually can be chosen in the range of from 0.05 to 2.5% by weight per weight of the mineral substrate. Preferably it is chosen in the range of from 0.1 to 1.5% by weight per weight of the mineral substrate.
  • the dust suppressant can be adhered to at least 50% of the surface of the mineral substrate. Preferably it is adhered to at least 80% of the surface of the mineral substrate and more preferably to at least 90%.
  • the first method of the present invention of reducing dust generation of mineral substrates comprises applying a dust suppressant to the surface of a mineral substrate having a temperature in the range of from 150 to 250O in an amount in the range of 0.05 to 2.5 % by weight per weight of mineral substrate, wherein the dust suppressant is a natural or synthetic triglyceride or a mixture comprising triglycerides.
  • the mineral substrate is an ore pellet, preferably an iron-ore pellet.
  • the dust suppressant is of ambient temperature when applied to the hot pellets, but, if desired, the dust suppressant may also be of a temperature as high as the temperature of the hot pellets.
  • the dust suppressant may be applied by well-known methods in the art such as spraying or dipping etc., spraying being preferred.
  • the process can be carried out batch-wise or continuously, e.g. using a conveyor belt on which the mineral substrates or pellets are sprayed and then further cooled down or transported to its storage site.
  • triglycerides as dust suppressants.
  • the second method of the present invention of reducing dust generation of mineral substrates comprises applying a dust suppressant to the surface of a mineral substrate having a temperature in the range of from 100 to 25O 0 C in an amount in the range of 0.05 to 2.5% by weight per weight of mineral substrate, wherein the dust suppressant is applied in the form of a nonaqueous foam.
  • the dust suppressant can be a liquid nonvolatile hydrocarbon, a nonvolatile polyol, a synthetic oil or a natural or synthetic triglyceride or mixtures comprising liquid nonvolatile hydrocarbons, nonvolatile polyol, synthetic oils or triglycerides.
  • Exampes of liquid nonvolatile hydrocarbons are petroleum oil and petroleum oil products such as mineral oil.
  • E ⁇ xamples of mineral oils are fuel oils, e.g. gasoline, diesel fuel, heating oil and kerosene, and lubricating oils.
  • nonvolatile polyols are glycol and polyethyleneglycol.
  • An example of a synthetic oil is silica oil. - A -
  • the dust suppressant is a natural or synthetic triglyceride or a mixture comprising triglycerides. More preferably, the dust suppressant is a natural triglyceride or a mixture comprising a natural triglyceride. [Examples of natural triglycerides are given above. Most preferably, the dust suppressant is selected from the group consisting of soyabean oil, sunflower oil, coconut oil, palmitic oil, cottonseed oil and castor oil or mixtures thereof.
  • the mineral substrate has a temperature in the range of from 150 to 250 0 C.
  • the dust suppressant is preferably applied in the presence of a surfactant.
  • suitables surfactants are HCF-740, which is a mixture of fluorosurfactants and hydrocarbon solvent, HCF-730, which is a nonionic mixture of silane surfactants, HCF-720, which is a nonionic mixtuture of silane surfactants and fluorosurfactants and HCF-710, which is a nonionic mixture of silane surfactants and sulfonic acids, all sold by Clearwater.
  • the surfactant can be used in amounts of 0.2 to 5% by weight per weight of dust suppressant. Preferably, it is used in amounts of 0.5 to 2.5% w/w and more preferably in amounts of 1 to 2% w/w.
  • the dust suppressant nonaqueous foam cah be applied to the mineral substrate by dipping the mineral substrate onto the surface of the foam or by passing it through the foam, which can be either a static or moving mass.
  • the foam can be applied to a moving mass of mineral substrate, e.g. at a transfer point on a conveyor belt.
  • the dust suppressant nonaqueous foam is of ambient temperature when applied to the hot pellets, but, if desired, the dust suppressant may also be of a temperature as high as the temperature of the hot pellets.
  • the mineral substrate is an ore pellet, preferably an iron-ore pellet.
  • Dust suppressants in the form of a nonaqueous oil.
  • Dust suppressant is as defined for the second method of reducing dust generation of mineral substrates.
  • the dust suppressant nonaqueous foam of the present invention has the advantage that it does not cause spitting when applied to hot mineral substrates. In addition, it avoids the enhalatio ⁇ risks connected with spraying a dust suppressant and also allows an enhanced control of the amount of adhered dust suppressant and a better distribution of the dust suppressant on the pellets, when very low amounts of adhered dust suppressant are desired.
  • Example 1 1.1. Preparation of a composition of iron ore pellets and soyabean oil using sprayed oil
  • 35 of the thus treated pellets are then selected, weighed (111.94 g) and afterwards transferred to a sealable metal tube (6.5 cm diameter by 17.5 cm length).
  • a sealable metal tube 6.5 cm diameter by 17.5 cm length.
  • the tube and its contents are then tumbled, end-to-end, in a Roaches "Dye Bath” for 2 hours at ambient temperature. Thereafter, the contents of the tube are transferred on a 500um sieve, where the fine material is separated from the remaining pellets.
  • Example 1.1 Preparation of a composition of iron ore pellets and sunflower oil using sprayed oil Example 1.1 is repeated, except that sunflower oil is used instead of soybean oil, the number of pellets is 35, the total weight of the pellets is 130.79 g and the amount of oil is 0.21% by weight per weight of pellets.
  • Example 1.2 is repeated.
  • the total weight of fine material is 0.98% by weight per weight of the untumbled pellets.
  • a colour change from grey (plant fired pellet) to red (rustic) is an indication of surface oxidation also infer that surface oxidation is reduced when sunflower oil is used instead of water.
  • Example 1 is repeated, however the 35 pellets employed (total weight 129.70 g) are not treated with a dust suppressant.
  • the percentage of fine material is 5.56% by weight per weight of untumbled pellets.
  • the thus treated pellets are weighed and transferred to a sealable metal tube (6.5 cm diameter by 17.5 cm length).
  • a sealable metal tube 6.5 cm diameter by 17.5 cm length.
  • the tube and its contents are then tumbled, end-to-end, in a Roaches "Dye Bath" for 2 hours at ambient temperature. Thereafter, the contents of the tube are transferred on a 4 mm sieve, where the fine material ( ⁇ 4 mm) is separated from the remaining pellets. The weight of the fine material is measured and the percentage (weight fine material/weight untumbled pellets)x100 is calculated.
  • Example 3 is repeated except that SN 150, a paraffin oil, is used instead of soyabean oil, and
  • Example 3 is repeated, however the 35 pellets employed are not treated with a dust suppressant.
  • Table 1 Dust measurement and pellet surface observation of iron ore pellets treated with foamed oils.
  • oils can be successfully applied as a foam to reduce dust generation and surface oxidation of iron ore pellets.
  • Soyabean oil was more effective than paraffin oil at equivalent dosages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lubricants (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Seasonings (AREA)
  • Paints Or Removers (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne une composition essentiellement constituée d'un substrat minéral et d'un suppresseur de poussière, qui est collé sur la surface du substrat minéral. L'invention concerne également des méthodes pour réduire une génération de poussière d'un substrat minéral. Ces méthodes consistent à appliquer un suppresseur de poussière sur la surface du substrat minéral.
EP05772038A 2004-07-27 2005-07-18 Suppression et reduction de poussiere d'oxydation de surface pour des agglomerats mineraux Pending EP1769091A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0416700.3A GB0416700D0 (en) 2004-07-27 2004-07-27 Dust suppresson and reduction of surface oxidation for mineral agglomerates
PCT/EP2005/053439 WO2006010721A2 (fr) 2004-07-27 2005-07-18 Suppression et reduction de poussiere d'oxydation de surface pour des agglomerats mineraux

Publications (1)

Publication Number Publication Date
EP1769091A2 true EP1769091A2 (fr) 2007-04-04

Family

ID=32947489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05772038A Pending EP1769091A2 (fr) 2004-07-27 2005-07-18 Suppression et reduction de poussiere d'oxydation de surface pour des agglomerats mineraux

Country Status (8)

Country Link
US (1) US20080028890A1 (fr)
EP (1) EP1769091A2 (fr)
CN (1) CN1989261A (fr)
AU (1) AU2005266371A1 (fr)
BR (1) BRPI0513860A (fr)
CA (1) CA2573964A1 (fr)
GB (1) GB0416700D0 (fr)
WO (1) WO2006010721A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CL2010000073A1 (es) 2009-01-29 2011-01-07 Midwest Ind Supply Inc Composicion para mejora quimica del suelo que comprende un fluido sintetico y un reductor del punto de fluidez; composicion que comprende fluido sintetico, material biodegradable y fibras sinteticas; composicion que comprende un aceite base y poliisobutileno; composicion que comprende fluido sintetico y un ligante; metodo de aplicacion.
US8177997B2 (en) 2009-01-29 2012-05-15 Midwest Industrial Supply, Inc. Chemical method and composition for soil improvement
US8033750B2 (en) 2009-03-31 2011-10-11 Midwest Industrial Supply, Inc. Method and composition for modifying soil and dust control
US8210769B2 (en) 2009-03-31 2012-07-03 Midwest Industrial Supply, Inc. Method and composition for modifying soil and dust control
US8066448B2 (en) 2009-03-31 2011-11-29 Midwest Industrial Supply, Inc. Dust suppression agent
BRPI0903986B1 (pt) * 2009-04-20 2019-09-17 Vale S/A Processo de inibição de emissão de particulados durante atrito de pelotas de minério de ferro tratadas termicamente
US8714105B2 (en) * 2010-04-16 2014-05-06 Vale S.A. Process for application of alcoholic derivative on heat treated pellets for inhibition of particulate emission and system for application of alcoholic derivative on heat treated pellets for inhibition of particulate emission
MX2012012786A (es) 2010-05-07 2013-02-07 Midwest Ind Supply Inc Metodo y composicion para la construccion de caminos y superficies.
US9045809B2 (en) 2012-05-05 2015-06-02 Nu-Iron Technology, Llc Reclaiming and inhibiting activation of DRI fines
US8702343B1 (en) 2012-12-21 2014-04-22 Midwest Industrial Supply, Inc. Method and composition for road construction and surfacing
EP3199501B1 (fr) * 2016-01-29 2023-06-07 Daw Se Melanges en poudre a faible emission de poussiere
US20190017229A1 (en) * 2017-07-17 2019-01-17 Investment Bikers, LLC d/b/a Petraviam Method and system for strengthening and hardening unpaved surfaces

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833642A (en) * 1954-11-10 1958-05-06 Gen Mills Inc Binder additive for making ore pellets
BE837659A (fr) * 1975-01-17 1976-05-14 Consolidation de surface
DD118669A1 (fr) * 1975-03-27 1976-03-12
JPH0244349B2 (ja) * 1982-12-28 1990-10-03 Neosu Kk Norokarakaishushitasentetsuryunoboseibojinzai
US4780233A (en) * 1987-09-04 1988-10-25 Betz Laboratories, Inc. Dust suppression methods and compositions
US5147452A (en) * 1991-04-24 1992-09-15 Betz Laboratories, Inc. Method of agglomerating mineral ore concentrate
BR0106149A (pt) * 2001-12-17 2003-09-23 Samarco Mineracao Sa Pelotas de minério de ferro com redução da abrasão, colagem, degradação e emissão de poeira, e processo de sua fabricação

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006010721A3 *

Also Published As

Publication number Publication date
AU2005266371A1 (en) 2006-02-02
WO2006010721A2 (fr) 2006-02-02
CA2573964A1 (fr) 2006-02-02
BRPI0513860A (pt) 2008-05-20
WO2006010721A3 (fr) 2006-08-10
CN1989261A (zh) 2007-06-27
GB0416700D0 (en) 2004-09-01
US20080028890A1 (en) 2008-02-07

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