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Publication numberUS3929627 A
Publication typeGrant
Publication dateDec 30, 1975
Filing dateDec 6, 1974
Priority dateJan 29, 1974
Also published asCA1013709A1
Publication numberUS 3929627 A, US 3929627A, US-A-3929627, US3929627 A, US3929627A
InventorsFrangiskos Antonios, Gambopoulos Theodor
Original AssigneeFinancial Mining Ind Ship
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Magnetic beneficiation for magnesite ores
US 3929627 A
Abstract
A process for the beneficiation of magnesite ores includes the selective enhancement of the magnetic properties of the gangue constituents so that said constituents can be easily separated by magnetic separators.
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Description  (OCR text may contain errors)

United States Patent 1 1 Frangiskos et al.

1 51 Dec. 30, 1975 MAGNETIC BENEFICIATION FOR MAGNESITE ORES Inventors: Antonios Frangiskos; Theodor Cambopoulos, both of Athens, Greece Financial Mining Industrial and Shipping Corporation, Athens, Greece Filed: Dec. 6, 1974 App]. No.: 530,395

Assignee:

Foreign Application Priority Data Jan. 29, 1974 Greece 3627 U.S. Cl. 209/9; 209/47; 209/214 Int. Cl. B03B 1/04 Field of Search 209/5, 9, 214, 47, 49, 209/38-40; 241/20, 24

References Cited UNITED STATES PATENTS 7/1907 Wait 209/9 X Lockwood 209/9 X Lockwood 209/47 X Lockwood 209/47 Schiffman 209/214 X Ladoo 209/214 X Gompper 209/9 X Adam 209/214 X Primary ExaminerRobert Halper Attorney, Agent, or Firm-Watson, Cole, Grindle &

Watson ABSTRACT tors.

5 Claims, No Drawings MAGNETIC BENEFicIATioN FoR MAGNESITE ones BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION In accordance with the invention a mineral is separated from its gangue, or the gangue is separated from the mineral contained therein, by artificially increasing in a selective manner the magnetic properties of the mineral or the gangue."With the present process the magnetic separation of diamagnetic or slightly paramagnetic ores or minerals can beeffected by using magnetic separators, e.g., permanent magnets, of low or medium strength. The increase of the magnetic properties of the ore or mineral to be separated is achieved by selective absorption on the surface of one or more constituents of the ore or mineral of a finely divided, highly magnetic substance such as a magnetite or a ferrosilicon. The thusly conditioned ore or mineral therefore has increased magnetic properties.

Such selective absorption is achieved by conditioning the crushed ore or mineral in an aqueous mixture of suitable reagents for activating the surface of the constituents to be magnetically separated. The crushed ore or mineral is again conditioned in an aqueous suspension of a finely divided, strongly magnetic material such as magnetite or ferrosilicon. This strongly magnetic material is selectively absorbed on the surface of one or more constituents of the ore or mineral and thus increases their magnetic properties. The constituents of the ore or mineral that have absorbed the strongly magnetic material are then separated from the remainder of the constituents by means of a magnetic separat r so as to obtain a concentrate of the remainder of the constituents.

After magnetic separation, recovery of the finely ground magnetic material from the surface of the ore or mineral constituents is carried out with water under pressure or with the use of detergents, or by agitation in another magnetic field.

DESCRIPTION OF THE PREFERRED EMBODIMENT The ore or mineral is crushed into small particles, as for example less than 15 mm., although particles larger than 15 mm. may be subjected to the present process. The crushed ore or mineral is then thoroughly washed and the various sized particles may be classified into fractions of less than 1 mm., 1 mm. to 15 mm., and greater than 15 mm. Each of the fractions are then conditioned for about 10 to 20 minutes in an aqueous mixture of suitable reagents for activation of the surface of the constituents thereof to be magnetically removed. After undergoing such conditioning the material is drained and fed into a second conditioner of a suspension of finely ground magnetite or ferrosilicon materials and is stirred for about 5 to minutes.

After this further conditioning step, during which the selective absorption of the magnetic material on the surface of the particles to be magnetically removed takes place, the material is drained and then fed into wet and dry magnetic separators for separating the absorbed magnetic material from the remainder of the material so as to obtain a concentrate of this remainder of the separated material.

It should be pointed out that the crushed ore or mineral may be first subjected to a mechanical pre-concentration process to further ultimately effect a concentrate of the remainder of the constituents.

This concentrate of non-magnetic material is washed and, according to its purity, constitutes the intermediate or final product. This concentrate can be further subjected to the beneficiation process as above described so as to improve its quality. This will depend on the quality of the first recovery treatment of the ore or mineral, or upon the specifications required of the final product.

The particles which absorbed the magnetic material may be thoroughly washed with water under pressure or with the use of a detergent, or by agitation in a magnetic field, so that the absorbed film of the highly magnetic material may be removed. This recovery of the finely ground magnetic material from the surface of the ore or mineral constituents is carried out by known methods, as for example thickening, washing, magnetic separation or the use of a demagnetizing coil.

The above sequence is carried out separately on each granulometric fraction as set forth hereinabove.

In particular, a magnesite ore containing slightly magnetic serpentine and non-magnetic feldspars and silica was subjected to the beneficiation process as in the manner above-described. The first conditioning was carried out in an aqueous suspension of, by volume, 1 percent diesel oil and 0.15 percent of a mixture of a dialkyl quaternary ammonium chloride such as ARQUAD 2C-75 and primary amines such as ARMAC T and ARMAC C. The first conditioning lasted for ten minutes and the second conditioning step was carried out in an aqueous suspension of finely ground magnetite of 1 percent by volume.

Magnetic separation of for example the l to 3 mm. fraction yielded a product of pure magnesite with 0.72 percent SiO and 1.08 percent CaO, by volume, constituting a fraction of 36.4 percent of the magnesite ore feed which has an analysis of 16.92 percent SiO, and 4.9 percent CaO. The reagents used for activation of the surface of the constituents of the ore to be magnetically separated are the same as those used for the flotation process disclosed in commonly owned U.S. application Ser. No. 530,396, filed on even date herewith. Only very small quantities of these reagents are re; quired for the present process thereby rendering the first conditioning step quite economical.

Another advantage with the use of the present process is that relatively coarse crushed ore can be used provided that the intended concentration can be carried out for such sized particles. The costly grinding operation normally required for flotation is therefore avoided.

Other advantages of the present process are that simple, high output devices such as wet magnetic separators may be used for the magnetic separation, and an almost complete recovery of the magnetic medium used is accomplished.

Obviously, many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention'may be practiced otherwise than as specifically described.

What is claimed is:

1. A process for the recovery of pure magnesite from magnesite ores containing magnesite, serpentine and other gangue material, comprising:

crushing a quantity of magnesite ore; I

conditioning the-crushed ore in an aqueous suspension containing by volume 1 percent diesel oil and 0.15 percent of a mixture of cationic collectors comprisingquaternary ammonium chlorides and primary amines for activating the surface of the serpentine and the other gangue material;

again conditioning the crushed ore in a suspension of a'finely divided strongly ferromagnetic material so as'to achieve selective absorption on the surface of the serpentine and the other gangue material as well as on the strongly siliceous and carbonaceous particles ofthe ore; and removing-the serpentine and the other gangue material as well as the strongly siliceous and carbonaceous particles of the ore from the remainder of the ore'by means of a magnetic separator to obtain a concentrate of magnesite. v

2. The processaccording to claim 1,,comprising the further step of first classifying the crushed magnesite ore into particle size fractions of less than 1 mm., 1 mm. to 15 mm. and greater than 15mm., each of the fractions being separately subjected to the recovery process. V

3. The process according'toclairn 1, comprising the further step of first subjectingthe crushed magnesite ore to a mechanical pre-concen'tration process to further effect a concentrate of the magnesite.

4. The process according to claim 1, comprising the further step'of repeating the entire beneficiation process on the concentrate obtained to improve its quality.

5. The process according to claim 3, comprising the further step of repeating the entire beneficiation process on the concentrate obtained to improve its quality.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US861782 *Mar 20, 1905Jul 30, 1907Internat Separator CompanyProcess of separating ore.
US933717 *Jan 11, 1909Sep 7, 1909Alfred Arthur LockwoodProcess of treating ores.
US989239 *Mar 18, 1907Apr 11, 1911Polygraph Duplicating Typewriter CompanyRedproducing and imitating machine.
US1043851 *Apr 29, 1912Nov 12, 1912Murex Magnetic Company LtdProcess of separating ores, &c.
US2240718 *Aug 13, 1938May 6, 1941Edgar Schiffman Le RoyConcentration of ores
US2269912 *Jan 4, 1939Jan 13, 1942Hubler William GMethod of treating ores
US2828010 *Jun 7, 1956Mar 25, 1958Gompper JohannesSeed separation
US3032189 *Nov 17, 1958May 1, 1962Int Minerals & Chem CorpBeneficiation of phosphatic ores
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4147614 *Jul 8, 1977Apr 3, 1979Theodor GambopoulosAqueous mixture of diesel oil, pine oil and diamine for conditioning of crushed magnesite ore in magnetic beneficiation process
US4176054 *May 16, 1977Nov 27, 1979Kelley Joseph AMagnetic adhesive
US4187170 *Jan 17, 1978Feb 5, 1980Foxboro/Trans-Sonics, Inc.Magnetic techniques for separating non-magnetic materials
US4219408 *Apr 27, 1978Aug 26, 1980Anglo-American Clays CorporationTo seed slurry causing flocculation
US4225425 *Dec 1, 1977Sep 30, 1980Anglo-American Clays CorporationMethod for separating metallic minerals utilizing magnetic seeding
US4225426 *Feb 2, 1978Sep 30, 1980Anglo-American Clays CorporationMagnetic beneficiation of clays utilizing magnetic particulates
US4298169 *Sep 26, 1979Nov 3, 1981The Regents Of The University Of MinnesotaSelective flocculation, magnetic separation, and flotation of ores
US4526681 *Oct 31, 1983Jul 2, 1985Purdue Research FoundationIntroducing second particles having different magnetic susceptibility, establishing magnetic susceptibility gradient, causing particles to separate
US4643822 *Feb 28, 1985Feb 17, 1987The Secretary Of State For Trade And Industry In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern IrelandMethod of separation of material from material mixtures
US4657666 *Oct 26, 1982Apr 14, 1987W.S.R. Pty. Ltd.Upgrading minerals
US4735707 *May 27, 1986Apr 5, 1988The British Petroleum Company P.L.C.Flocculation using polyacrylamide, magnetic separation
US4765486 *Jun 21, 1983Aug 23, 1988The United States Of America As Represented By The Secretary Of AgricultureMethod for obtaining a purified fraction from a mixture using a magnetic fluid
US4810368 *May 28, 1987Mar 7, 1989Electro Minerals (Canada) Inc.Magnetic powder
US6098810 *Jun 26, 1998Aug 8, 2000Pueblo Process, LlcFlotation process for separating silica from feldspar to form a feed material for making glass
US8056728Mar 31, 2009Nov 15, 2011Mba Polymers, Inc.Methods, systems, and devices for separating materials using magnetic and frictional properties
US8066885 *Jan 3, 2008Nov 29, 2011Cytec Technology Corp.Improved process for the beneficiation of calcium carbonate ores using a mixture of magnetic microparticles and a mineral active compound containing a ammonium or phosphonium functionalitysince separation generally increases as the particle size of the magnetic particles is decreased
WO2009124015A2 *Mar 31, 2009Oct 8, 2009Mba Polymers, Inc.Methods, systems, and devices for separating materials using magnetic and frictional properties
Classifications
U.S. Classification209/9, 209/47, 209/214
International ClassificationB03C1/005, B03C1/01
Cooperative ClassificationB03C1/01
European ClassificationB03C1/01