WO2006018771A1 - Traitement de minerai de fer par micro-ondes - Google Patents

Traitement de minerai de fer par micro-ondes Download PDF

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Publication number
WO2006018771A1
WO2006018771A1 PCT/IB2005/052605 IB2005052605W WO2006018771A1 WO 2006018771 A1 WO2006018771 A1 WO 2006018771A1 IB 2005052605 W IB2005052605 W IB 2005052605W WO 2006018771 A1 WO2006018771 A1 WO 2006018771A1
Authority
WO
WIPO (PCT)
Prior art keywords
low grade
mineral
grade ore
microwave energy
phosphate
Prior art date
Application number
PCT/IB2005/052605
Other languages
English (en)
Inventor
Gerrit Coetzer
Original Assignee
Sishen Iron Ore Company (Proprietary) Limited
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 Sishen Iron Ore Company (Proprietary) Limited filed Critical Sishen Iron Ore Company (Proprietary) Limited
Publication of WO2006018771A1 publication Critical patent/WO2006018771A1/fr

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
    • 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
    • C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys

Definitions

  • THIS INVENTION relates to mineral processing.
  • the invention relates to the treatment of iron ore.
  • a method of assisting the liberation of a first mineral from a particulate low grade ore containing said first mineral in a layered grain structure with at least a second mineral said method including increasing the aspect ratio of grains of the low grade ore containing the first mineral by exposing the low grade ore to microwave energy.
  • low grade ore is meant to include any iron ore in which the valuable mineral content is at a concentration that does not exceed about 55% (w/w) iron.
  • the first mineral may be an iron-containing mineral.
  • the low grade ore may be banded ironstone.
  • banded ironstone includes iron-containing layers of haematite and goethite separated by gangue material such as silica.
  • the microwave energy may be at a frequency of between 300 MHz and 300
  • GHz preferably from 300 MHz to 50 GHz, more preferably from 300 MHz to 20 GHz and, most preferably from 300 MHz to 5 GHz.
  • the low grade ore may be exposed to microwave energy while being held at or below atmospheric pressure.
  • the microwave energy may have an input power of at least 1 kW.
  • the low grade ore may be continuously irradiated with microwaves for a predetermined time period. Instead, the low grade ore may be exposed to pulsed microwave energy for a predetermined time period.
  • the low grade ore may be exposed to microwave energy for less than 5 seconds, preferably less than 1 second and, more preferably, between 0.5 seconds and 0.001 seconds.
  • the low grade ore may have a particle size of 100 % passing 100 mm and, preferably, larger than 2.5 mm. Preferably, the particle size is smaller than 100 % passing 53 mm.
  • the method may be carried out as a continuous or batch process.
  • the low grade ore may be held in or may be passed through a mono-mode microwave cavity during exposure to the microwave energy.
  • the mono-mode cavity may be the same as or similar to that which is described in US 5,824,133, which is incorporated herein in its entirety by reference.
  • the low grade ore exposed to microwave energy may subsequently be subjected to further thermal shock, e.g. by quenching.
  • a method of assisting the liberation of phosphate-containing minerals from iron-containing mineral grains in a particulate low grade ore having said iron-containing mineral in a layered grain structure with the phosphate-containing minerals said method including exposing the low grade ore to microwave energy.
  • the ore may have a particle size of 100 % passing 100 mm and most preferably 100 % passing 53 mm. This ore is subsequently typically milled down to a preferred particle size of 5 mm and, most preferably, down to 2.5 mm to achieve substantial liberation of phosphate minerals from the ore.
  • the phosphate-containing minerals may be liberated from specularitic haematite present in banded ironstone thereby decreasing the phosphate mineral content.
  • the bulk phosphate mineral content of the banded ironstone present as P 2 O 5 may be reduced to less than 0.21 % by mass.
  • Typical phosphate containing minerals include apatite, goyazite, gorceixite and florencite.
  • microwave energy and its application may be as hereinbefore described.
  • the method may also include subjecting the low grade ore to thermal shock, e.g. by quenching.
  • Figure 1 shows a microscope photograph of ore treated in accordance with the invention
  • Figure 2 shows a microscope photograph of the same ore as in Figure 1 , but milled in conventional fashion;
  • Figures 3 and 4 show microscope photographs of phosphate mineral associations with haematite.
  • Figure 1 of the illustrations shows the grain structure of the ore after treatment in accordance with the invention observed under a Wetzlar microscope in reflected light.
  • Blocky specular haematite particles (white) which have broken parallel to the lamina direction are visible.
  • the width of field of view 1.6 mm.
  • Figure 2 shows a sample of the banded ironstone which was milled in accordance with conventional techniques. A 30 kg sample was milled down to -4.75 mm in a rod mill for 20 minutes and the -1.4 mm size fraction was mineralogically examined.
  • the microwave treated sample has mineral containing grains having a generally higher aspect ratio (i.e. the ratio of the length of the grain to its width). Particles in Figure 1 which are generally rectangular were found to be more abundant than the untreated particles shown in Figure 2 of the illustrations due to even breakage.
  • the phosphate content in banded ironstone is about 0.05 % to 0.06 % (about 0.21 to 0.28 % P 2 O 5 ).
  • Conventional milling as described above reduced the phosphate content to 0.035 %.
  • the phosphate content of the treated ore was reduced to below 0.035% and, more particularly, to below 0.03%.
  • Figures 3 and 4 show some phosphate mineral associations, such as apatite and goyazite, respectively, with haematite.
  • the inventor believes that it is an advantage of the invention that by subjecting the layered low grade ores to the method in accordance with the invention, the mineral particles are liberated or the structure is at least weakened (as a result of the intergranular fracture) to be more susceptible to subsequent mechanical liberation steps.
  • the mineral particles being liberated have a marked and surprisingly higher aspect ratio when compared to conventional milling techniques and exhibit an abundance of rectangularly shaped particles. This allows for the reduction in energy consumption in down stream crusher stages. For example, a typical design crusher circuit that would be required for banded ironstone would involve secondary (64 x 5mm), tertiary (53 x 5mm), quaternary (minus 19mm) and fine recirculating (minus 19mm) crushing stages.
  • Material that has been treated in accordance with the invention reduces the number of crushing stages required as well as the size of crushers used in certain crushing stages. It is also believed that the problem of slimes generation present during conventional ultra-fine liberation is alleviated by improving liberation at coarser particle size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Toxicology (AREA)
  • Food Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé destiné à faciliter la libération d'un premier minerai par rapport à un minerai particulaire pauvre contenant le premier minerai dans une structure granuleuse en couches, ainsi qu'au moins un deuxième minerai. Le procédé selon l'invention consiste à augmenter le facteur de forme des grains du minerai pauvre contenant le premier minerai par exposition du minerai pauvre à de l'énergie de micro-ondes.
PCT/IB2005/052605 2004-08-16 2005-08-04 Traitement de minerai de fer par micro-ondes WO2006018771A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2004/6500 2004-08-16
ZA200406500 2004-08-16

Publications (1)

Publication Number Publication Date
WO2006018771A1 true WO2006018771A1 (fr) 2006-02-23

Family

ID=35355234

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/052605 WO2006018771A1 (fr) 2004-08-16 2005-08-04 Traitement de minerai de fer par micro-ondes

Country Status (1)

Country Link
WO (1) WO2006018771A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012107027A1 (fr) * 2011-02-10 2012-08-16 Hochschule Mittweida (Fh) Procédé et dispositif de désagrégation de minerai
CN102828021A (zh) * 2012-09-24 2012-12-19 重庆大学 一种磷铁矿微波耦合脱磷方法
CN104399572A (zh) * 2014-10-31 2015-03-11 东北大学 一种采用微波辅助磨选硼铁矿的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041841A1 (fr) * 1980-06-11 1981-12-16 Cato Research Corporation Procédé d'extraction de métaux à partir de minerais
SU1326334A1 (ru) * 1985-05-05 1987-07-30 Институт Геотехнической Механики Ан Усср Способ обработки материалов
WO1992018249A1 (fr) * 1991-04-10 1992-10-29 The Broken Hill Proprietary Company Limited Recuperation d'especes de valeur dans un minerai
RU2026991C1 (ru) * 1992-04-06 1995-01-20 Инженерный центр Московского государственного горного университета Способ обработки горных пород и устройство для его осуществления
US5824133A (en) * 1996-03-12 1998-10-20 Emr Microwave Technology Corporation Microwave treatment of metal bearing ores and concentrates
WO2003083146A1 (fr) * 2002-04-02 2003-10-09 The University Of Nottingham Pretraitement de materiaux multiphase par ondes electromagnetiques a forte intensite de champ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041841A1 (fr) * 1980-06-11 1981-12-16 Cato Research Corporation Procédé d'extraction de métaux à partir de minerais
SU1326334A1 (ru) * 1985-05-05 1987-07-30 Институт Геотехнической Механики Ан Усср Способ обработки материалов
WO1992018249A1 (fr) * 1991-04-10 1992-10-29 The Broken Hill Proprietary Company Limited Recuperation d'especes de valeur dans un minerai
RU2026991C1 (ru) * 1992-04-06 1995-01-20 Инженерный центр Московского государственного горного университета Способ обработки горных пород и устройство для его осуществления
US5824133A (en) * 1996-03-12 1998-10-20 Emr Microwave Technology Corporation Microwave treatment of metal bearing ores and concentrates
WO2003083146A1 (fr) * 2002-04-02 2003-10-09 The University Of Nottingham Pretraitement de materiaux multiphase par ondes electromagnetiques a forte intensite de champ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 198810, Derwent World Patents Index; Class P41, AN 1988-069337, XP002361909 *
DATABASE WPI Section PQ Week 199533, Derwent World Patents Index; Class P41, AN 1995-253464, XP002361923 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012107027A1 (fr) * 2011-02-10 2012-08-16 Hochschule Mittweida (Fh) Procédé et dispositif de désagrégation de minerai
CN103237908A (zh) * 2011-02-10 2013-08-07 米特韦达应用技术大学 破碎矿石的方法和设备
AU2012213987B2 (en) * 2011-02-10 2015-04-09 Hochschule Mittweida (Fh) Method and device for breaking up ore
US9028581B2 (en) 2011-02-10 2015-05-12 Hochschule Mittweida (Fh) Method and device for breaking up ore
CN102828021A (zh) * 2012-09-24 2012-12-19 重庆大学 一种磷铁矿微波耦合脱磷方法
CN102828021B (zh) * 2012-09-24 2014-12-03 重庆大学 一种磷铁矿微波耦合脱磷方法
CN104399572A (zh) * 2014-10-31 2015-03-11 东北大学 一种采用微波辅助磨选硼铁矿的方法

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