# US 9,040,154 B2 · Magnetic composite particles

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- Number: US 9,040,154 B2
- Document ID: US9040154B2
- Status: Granted
- Kind: B2
- Application number: 13/515,513
- Filed: 2010-12-14
- Published: 2012-11-08
- Granted: 2015-05-26
- Earliest claimed: 2009-12-16
- Assignees: Neotechnology
- Applicants: Peter Rogin; Peter William de Oliveira; Christian Wühr; Michael Veith; Douglas Espin
- Inventors: Peter Rogin; Peter William de Oliveira; Christian Wühr; Michael Veith; Douglas Espin
- Web page: https://patentgrep.com/patent/US9040154B2

## CPC

- B03C 1/01: by addition of magnetic adjuvants
- B03C 1/28: Magnetic plugs and dipsticks
- B82Y 25/00: Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
- C01G 49/0018: {Mixed oxides or hydroxides, (C01G49/0009 takes precedence)}
- C01G 49/0036: {containing one alkaline earth metal, magnesium or lead}
- C09C 1/22: Compounds of iron {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)}
- C09K 8/805: {Coated proppants}
- G11B 5/708: characterised by addition of non-magnetic particles to the layer
- H01F 1/24: the particles being insulated
- B03C 2201/18: Magnetic separation whereby the particles are suspended in a liquid
- C01P 2006/42: Magnetic properties
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- Y10T 428/32: Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Magnetic composite particles can be used as proppants and allow for deliberate heating by applying an alternating magnetic field.

## Claims

### Claim 1

Magnetic composite particles comprising composite particles comprising at least one magnetic object and a vitreous binder phase, wherein the composite particles have a diameter between 0.1 and 50 mm and wherein the proportion of at least one magnetic object in relation to the vitreous binder phase, measured by % by weight, is between 1:1 and 4:1.

### Claim 2 (depends on 1)

Magnetic composite particles as claimed in claim 1, wherein the magnetic object comprises a ternary iron oxide from the class of the soft ferrites.

### Claim 3 (depends on 1)

Magnetic composite particles as claimed in claim 1, wherein the magnetic object comprises a ternary iron oxide of the formula MFe2O4 where M is selected from the group consisting of Cr, Ga, Cd, Mg, Mn, Li, Ca, Ni, Co, Cu, Zn, Zr and Fe(II).

### Claim 4 (depends on 1)

Magnetic composite particles as claimed in claim 1, wherein the composite particles have been coated with a vitreous layer.

### Claim 5 (depends on 4)

Magnetic composite particles as claimed in claim 4, wherein the vitreous layer has a thickness of more than 0.5 μm.

### Claim 6 (depends on 1)

A proppant comprising magnetic composite particles as claimed in claim 1.

### Claim 7 (depends on 1)

A process for removing or extracting liquid or liquefiable components from geological formations or particulate materials, comprising:
a) introducing magnetic composite particles as claimed in claim 1 into geological formations or particulate materials;
b) inductively heating the magnetic composite particles by applying an external magnetic alternating field;
c) removing or extracting liquid or liquefiable components.

### Claim 8 (depends on 7)

A process according to claim 7, wherein a frequency of the magnetic alernating field is from 50 kHz to 10 MHz.

### Claim 9 (depends on 1)

The use of magnetic composite particles as claimed in claim 1 for generation of heat by application of an external magnetic alternating field.

### Claim 10 (depends on 1)

The use of magnetic composite particles as claimed in claim 1 as proppants.

### Claim 11 (depends on 1)

A method of generating heat, comprising applying an external magnetic field to the magnetic composite particles as claimed in claim 1.

### Claim 12 (depends on 1)

Magnetic composite particles according to claim 1, wherein the proportion of the at least one magnetic object is more than 40% by weight.

### Claim 13 (depends on 1)

Magnetic composite particles according to claim 1, wherein the proportion of the at least one magnetic object is more than 60% by weight.

### Claim 14

A process for producing magnetic composite particles, comprising:
a) producing a composition from at least one magnetic object and/or a precursor for a magnetic object and at least one precursor of a vitreous binder phase;
b) producing granules from the composition; and
c) heat treating the granules to form the vitreous binder phase,
wherein the proportion of the at least one magnetic object in relation to the vitreous binder phase, measured by % by weight, is between 1:1 and 4:1.

### Claim 15 (depends on 14)

The process as claimed in claim 14, wherein the heat treatment is conducted at more than 500° C.

### Claim 16 (depends on 14)

The process as claimed in claim 14, wherein the heat-treated granules have a diameter of 0.1 to 50 mm.

### Claim 17 (depends on 14)

The process as claimed in claim 14, wherein the heat-treated granules are coated in a further step with at least one precursor for a vitreous layer and then heat-treated.