WO2006120181A2 - Method to reduce the amount of dust formation of metal oxides - Google Patents

Method to reduce the amount of dust formation of metal oxides Download PDF

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Publication number
WO2006120181A2
WO2006120181A2 PCT/EP2006/062129 EP2006062129W WO2006120181A2 WO 2006120181 A2 WO2006120181 A2 WO 2006120181A2 EP 2006062129 W EP2006062129 W EP 2006062129W WO 2006120181 A2 WO2006120181 A2 WO 2006120181A2
Authority
WO
WIPO (PCT)
Prior art keywords
alkali metal
silicate
metal oxide
oxide particles
metal silicate
Prior art date
Application number
PCT/EP2006/062129
Other languages
French (fr)
Other versions
WO2006120181A3 (en
Inventor
Jeroen Rogiers
Original Assignee
Nv Bekaert 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 Nv Bekaert Sa filed Critical Nv Bekaert Sa
Publication of WO2006120181A2 publication Critical patent/WO2006120181A2/en
Publication of WO2006120181A3 publication Critical patent/WO2006120181A3/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/06—Treatment with inorganic compounds
    • C09C3/063—Coating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/0009—Pigments for ceramics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/22—Compounds of iron
    • C09C1/24—Oxides of iron
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3045—Treatment with inorganic compounds
    • C09C1/3054—Coating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0075—Anti-dusting agents

Definitions

  • the invention relates to a method to reduce the amount of dust formation of metal oxides, in particular of iron oxide.
  • iron oxides such as FeO, Fe 2 O 3 and Fe 3 O 4 are formed on the surface of a steel rod. Also during the storage of steel rods additional iron oxides are formed.
  • the iron oxides formed on the steel rod must be removed. This can be done in a chemical or in a mechanical process.
  • Mechanical descaling comprises for example abrasive belting, shot blasting and reverse bending.
  • the iron oxide scale removed from the steel in the descaling process has to be further treated and/or recovered. This is an expensive process mainly due to the dust formation during the treatment of the iron oxide scale.
  • a method to reduce the amount of dust formation of metal oxide particles such as iron oxide particles is provided. The method comprises the step of mixing the metal oxide particles with an aqueous solution of an alkali metal silicate to form a metal oxide- alkali metal silicate.
  • alkali metal silicate is defined as a silicate of an alkali metal, i.e. a compound comprising an alkali metal oxide (MOx) and silica (SiOx).
  • the alkali metal silicate comprises preferably sodium silicate or potassium silicate.
  • the alkali metal silicate comprises preferably sodium silicate or potassium silicate or a mixture of sodium silicate and potassium silicate.
  • Sodium silicates Na 2 O. XSiO 2
  • waterglass is also known as waterglass.
  • the most important silicate variable is the ratio silica to alkali metal oxide.
  • the ratio is defined by the molar proportion of silica (SiO 2 ) to alkali (Na 2 O).
  • the molar ratio is preferably between 1.6 and 3.2.
  • the aqueous solution of the alkali metal silicate has preferably a concentration between 0.1 and 60 wt%, as for example 10 or 30 wt%.
  • the alkali metal silicate and the metal oxide particles can be mixed by adding an aqueous solution of an alkali metal silicate to the metal oxide particles followed by stirring or mixing; or by adding metal oxide particles to an aqueous solution of an alkali metal silicate followed by stirring or mixing.
  • the metal oxide-alkali metal silicate forms an agglomerate free of dust that can be further processed or that can be recycled.
  • a metal oxide- alkali metal silicate in particular of iron oxide-alkali metal silicate obtained by the above mentioned method as an additive for concrete or a ceramic material is provided.
  • a first method comprises the following steps mixing of 300 g of an aqueous solution comprising 10 wt% Na 2 O.xSiO 2 (x between 1.6 and 3.2) with 1 kg iron oxide particles, and
  • the reaction product comprises an agglomerate of iron oxide-sodium silicate.
  • a second method comprises the following steps mixing of 300 g of an aqueous solution comprising 30 wt% Na 2 O.xSiO 2 with 1 kg iron oxide particles, and
  • the reaction product comprises an agglomerate of iron oxide-sodium silicate.

Abstract

The invention relates to a method to reduce the amount of dust formation of metal oxide particles. The method comprises the step of mixing metal oxide particles with an aqueous solution of an alkali metal silicate to form a metal oxide-alkali metal silicate. The invention further relates to the use of a metal oxide-alkali metal silicate as an additive for concrete or a ceramic material.

Description

Method to reduce the amount of dust formation of metal oxides
Field of the invention.
The invention relates to a method to reduce the amount of dust formation of metal oxides, in particular of iron oxide.
Background of the invention.
Recycling or further processing of metal oxide particles, such as iron oxide particles, is often difficult and expensive because of dust formation.
Due to the elevated temperature obtained during the processing of a steel rod iron oxides such as FeO, Fe2O3 and Fe3O4 are formed on the surface of a steel rod. Also during the storage of steel rods additional iron oxides are formed.
These oxides are commonly known as rust.
To allow successful drawing of the steel, the iron oxides formed on the steel rod must be removed. This can be done in a chemical or in a mechanical process. Mechanical descaling comprises for example abrasive belting, shot blasting and reverse bending.
The iron oxide scale removed from the steel in the descaling process has to be further treated and/or recovered. This is an expensive process mainly due to the dust formation during the treatment of the iron oxide scale.
Summary of the invention.
It is an object of the present invention to provide a method to reduce the dust formation of metal oxides, in particular of iron oxide. It is another object of the present invention to provide a method to agglomerate fine metal oxide particles before they can be reused, recycled or further processed.
It is a further object of the present invention to provide the use of metal oxide-alkali metal silicate as an additive for concrete or for ceramic materials. According to a first aspect of the present invention a method to reduce the amount of dust formation of metal oxide particles such as iron oxide particles is provided. The method comprises the step of mixing the metal oxide particles with an aqueous solution of an alkali metal silicate to form a metal oxide- alkali metal silicate.
For the purpose of the invention, alkali metal silicate is defined as a silicate of an alkali metal, i.e. a compound comprising an alkali metal oxide (MOx) and silica (SiOx).
The alkali metal silicate comprises preferably sodium silicate or potassium silicate.
The alkali metal silicate comprises preferably sodium silicate or potassium silicate or a mixture of sodium silicate and potassium silicate. Sodium silicates (Na2O. XSiO2) is also known as waterglass.
The most important silicate variable is the ratio silica to alkali metal oxide. For the purpose of this invention the ratio is defined by the molar proportion of silica (SiO2) to alkali (Na2O). The molar ratio is preferably between 1.6 and 3.2.
The aqueous solution of the alkali metal silicate has preferably a concentration between 0.1 and 60 wt%, as for example 10 or 30 wt%.
The alkali metal silicate and the metal oxide particles can be mixed by adding an aqueous solution of an alkali metal silicate to the metal oxide particles followed by stirring or mixing; or by adding metal oxide particles to an aqueous solution of an alkali metal silicate followed by stirring or mixing. The metal oxide-alkali metal silicate forms an agglomerate free of dust that can be further processed or that can be recycled.
According to a further aspect of the invention, the use of a metal oxide- alkali metal silicate, in particular of iron oxide-alkali metal silicate obtained by the above mentioned method as an additive for concrete or a ceramic material is provided.
Description of the preferred embodiments of the invention. The invention is further illustrated by means of some embodiments.
A first method comprises the following steps mixing of 300 g of an aqueous solution comprising 10 wt% Na2O.xSiO2 (x between 1.6 and 3.2) with 1 kg iron oxide particles, and
- stirring the solution.
The reaction product comprises an agglomerate of iron oxide-sodium silicate.
A second method comprises the following steps mixing of 300 g of an aqueous solution comprising 30 wt% Na2O.xSiO2 with 1 kg iron oxide particles, and
- stirring the solution.
The reaction product comprises an agglomerate of iron oxide-sodium silicate.

Claims

1. A method to reduce the amount of dust formation of metal oxide particles, said method comprises the step of mixing said metal oxide particles with an aqueous solution of an alkali metal silicate to form a metal oxide-alkali metal silicate.
2. A method according to claim 1 , whereby said metal oxide - alkali metal silicate comprises an agglomerate free of dust.
3. A method according to claim 1 or 2, whereby said metal oxide particles comprise iron oxide particles.
4. A method according to claim 1 or 2, whereby said metal oxide particles comprise silicon oxide particles.
5. A method according to any one of the preceding claims, whereby said alkali metal silicate comprises sodium silicate or potassium silicate.
6. A method according to any one of the preceding claims, whereby said aqueous solution of the alkali metal silicate has a concentration between 0.1 wt% and 60 wt%.
7. The use of a metal oxide-alkali metal silicate as an additive for concrete or a ceramic material.
8. The use according to claim 7, whereby said metal oxide-alkali metal silicate comprises iron oxide-alkali metal silicate.
PCT/EP2006/062129 2005-05-11 2006-05-08 Method to reduce the amount of dust formation of metal oxides WO2006120181A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05103925.3 2005-05-11
EP05103925 2005-05-11

Publications (2)

Publication Number Publication Date
WO2006120181A2 true WO2006120181A2 (en) 2006-11-16
WO2006120181A3 WO2006120181A3 (en) 2007-07-26

Family

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PCT/EP2006/062129 WO2006120181A2 (en) 2005-05-11 2006-05-08 Method to reduce the amount of dust formation of metal oxides

Country Status (1)

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WO (1) WO2006120181A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207265A1 (en) * 1992-03-07 1993-09-09 Bmd Garant Entstaubungstechnik Prepn. of foundry filter dust for environment-friendly disposal - in which dust is mixed with binding material, pressed to form solid bodies, and fused in blast furnace
US5573576A (en) * 1994-10-24 1996-11-12 International Solidification, Inc. Method of treating steel mill waste
WO1996037634A1 (en) * 1995-05-25 1996-11-28 Nu-Rock Technology Pty. Ltd. Process for forming shaped articles
CZ293157B6 (en) * 1998-11-17 2004-02-18 Keravit, Spol. S R. O. Treatment process of ferroalloy dust fractions

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53125226A (en) * 1977-04-09 1978-11-01 Chisso Corp Silica dust treating method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4207265A1 (en) * 1992-03-07 1993-09-09 Bmd Garant Entstaubungstechnik Prepn. of foundry filter dust for environment-friendly disposal - in which dust is mixed with binding material, pressed to form solid bodies, and fused in blast furnace
US5573576A (en) * 1994-10-24 1996-11-12 International Solidification, Inc. Method of treating steel mill waste
WO1996037634A1 (en) * 1995-05-25 1996-11-28 Nu-Rock Technology Pty. Ltd. Process for forming shaped articles
CZ293157B6 (en) * 1998-11-17 2004-02-18 Keravit, Spol. S R. O. Treatment process of ferroalloy dust fractions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 197849 Derwent Publications Ltd., London, GB; Class A81, AN 1978-88638A XP002366127 "Silica dust agglomerates prodn. for use in mfr. of metallic silicon - by agglomerating dust with binder comprising PVA and liq. contg. silicic acid, e.g. sodium silicate soln." & JP 53 125226 A (CHISSO CORP) 1 November 1978 (1978-11-01) *

Also Published As

Publication number Publication date
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