Binder Composition For The Agglomeration Of Fine Minerals And Pelletizing Process

a technology of binder composition and fine minerals, which is applied in the direction of blast furnace details, furnaces, sport apparatus, etc., can solve the problems of insufficient pellet strength, inconvenient feeding of fine particles, and insufficient capillary force for imparting sufficient pellet strength

Inactive Publication Date: 2014-07-10
CLARIANT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention describes a method to make pellets of particulate minerals by using a two-component binder system. One component is a colloid agent that forms agglomerates of mineral particles, and the other component is a synthetic polymer that acts as a dispersant for mineral particles. This method results in stronger pellets with better dry and green compressive strength compared to using either component alone. This is based on a synergistic effect between the colloid agent and the polymer.

Problems solved by technology

Powdered iron ore concentrates containing fine particles are not suitable as feed because fines (i.e. fine mineral particles having a particle size from 0.01 to 0.3 mm as e.g. measured by sieves) tend to pack into a nonpermeable bed.
In addition, the fine particles are likely to be carried away as dust by the high gas flow rates into the blast furnace and into the direction of the reduction reactor.
Capillary forces are strong but are not sufficient for imparting sufficient pellet strength to finished pellets.
Van der Waals bonding is very weak and only of minor importance for imparting sufficient pellet strength to finished pellets.
The main disadvantage of clays and other binders based on silicate minerals is that they increase silica content in the finished pellet.
Otherwise, if calcium oxide is hydrated during the pelletization process, it will induce damage to the pellet structure due to the volume expansion.
Organic binders also burn out during sintering thus causing an increase in the micro porosity of the finished pellets.

Method used

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  • Binder Composition For The Agglomeration Of Fine Minerals And Pelletizing Process
  • Binder Composition For The Agglomeration Of Fine Minerals And Pelletizing Process
  • Binder Composition For The Agglomeration Of Fine Minerals And Pelletizing Process

Examples

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example 1

[0079]The example below shows iron ore VVC, pelletized using hydrated lime as colloid agent with and without the addition of synthetic acrylic acid-maleic acid copolymer (Fongrascale HOE®). Table 1 clearly shows that the amount of calcium hydroxide, necessary to achieve the same compressive strength decreased when the synthetic polymer was added.

TABLE 1Iron ore VVC pelletized with hydrated lime and the acrylic-maleiccopolymer Fongrascale® HOEBinder AdditiveCompressive strength(kg / ton)(kgf / pellets)Fongrascale®DriedTestHydrated LimeHOEGreen(105° C.)1 (comp.)27.0—1.372.212 (comp.)—0.501.602.15321.00.501.302.60

example 2

[0080]The example below shows iron ore VVC, pelletized using hydrated lime as colloid agent with and without the addition of synthetic melamine-formaldehyde copolymer (Dismulgan® V 3377). Table 2 clearly shows that the amount of calcium hydroxide, necessary to achieve the same compressive strength decreased when the synthetic polymer was added.

TABLE 2Iron ore VVC pelletized with hydrated lime and the melamine-formaldehyde copolymer Dismulgan® V 3377Binder AdditiveCompressive strength(kg / ton)(kgf / pellets)Dismulgan®DriedTestHydrated LimeV 3377Green(105° C.)1 (comp.)27.0—1.372.21221.00.501.242.50313.00.501.402.31

example 3

[0081]The example below shows iron ore VVC, pelletized using hydrated lime as colloid agent with and without the addition of synthetic polycarboxylate. Table 4 clearly shows that the amount of calcium hydroxide necessary to achieve the same comprehensive strength decreased when the synthetic polymer was added.

TABLE 3Iron ore VVC pelletized with hydrated lime and polycarboxylateBinder AdditiveCompressive strength(kg / ton)(kgf / pellets)TestHydrated LimePolycarboxylateGreenDried (105° C.)1 (comp.)27.0—1.372.21221.00.501.352.60313.00.501.612.19

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Abstract

The instant invention relates to a binder composition for pelletization of fine mineral particles comprisinga) at least one colloid agent which exerts a cohesive force on the mineral particles forming the pellets, andb) at least one synthetic polymer which disperses mineral particles evenly in the pellets.

Description

FIELD OF THE INVENTION[0001]Pelletization is the standard method of agglomerating used to turn fine minerals fractions, mainly of iron ore, into an adequate product (pellet) to be fed to the blast furnace and to the direct reduction reactors. The present invention describes the use of a binder composition comprising a colloid agent and a synthetic polymer. The compressive strength of the green, dried and fired pellets was evaluated and the result shows better performance than the compounds used individually. The invention also provides for a pelletizing process using the binder composition.BACKGROUND OF THE INVENTION[0002]In order to become commercially usable, low grade ores are generally concentrated and pelletized prior to the reduction processing in a blast furnace. It is common in the mining industry to produce ore agglomerates or to pelletize finely ground mineral ore. Considering iron ore concentrate, the feed to a blast furnace should form a permeable bed of material, permit...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22B1/244
CPCC22B1/244C22B1/243Y02P10/20C22B1/242
InventorTOOGE, CARLOS AUGUSTO BLASQUESBARTALINI, NILSON MARSANTOS, ALMIR T.DA SILVA, WAGNER CLAUDIOSPECK CASSOLA, MONICAARIAS MEDINA, JORGE ANTONIO
OwnerCLARIANT SA