# US 11,026,428 B2 · Bioactive material

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- Number: US 11,026,428 B2
- Document ID: US11026428B2
- Status: Granted
- Kind: B2
- Application number: 16/309,891
- Filed: 2017-06-02
- Published: 2019-05-16
- Granted: 2021-06-08
- Earliest claimed: 2016-06-20
- Assignees: Calix, Inc.
- Applicants: Calix Ltd
- Inventors: Mark Sceats
- Web page: https://patentgrep.com/patent/US11026428B2

## CPC

- A01N 59/06: Aluminium; Calcium; Magnesium; Compounds thereof
- A01N 25/14: wettable
- A61L 2/23: Solid materials, e.g. granules, powders, blocks or tablets
- C01F 5/08: by calcining magnesium hydroxide
- C01F 11/06: of carbonates
- C04B 2/10: Preheating, burning calcining or cooling (decarbonation during burning of cement raw materials C04B7/43; {obtaining CaO or MgO otherwise than by thermal decomposition of the corresponding carbonates C01F11/02, C01F5/02})
- C04B 22/064: {of the alkaline-earth metals}
- B01J 6/004: {using hot gas streams in which the material is moved}
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/12: Surface area
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; 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 cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A process and apparatus for manufacture of biocide products are described. The biocide properties arise from the caustic calcined powder, from carbonates such as such as magnesite and dolomite, and from hydroxides such as brucite. The method of manufacture is based on the production of high surface area oxide particles using an indirectly heated counterflow reactors for specifically calcining the carbonates and the hydroxides without significant sintering. The biocide products may be a powder or a hydrated slurry. A hydrated slurry is preferred for agricultural applications as a spray. For aquaculture applications, the products have a preferred particle size distribution to impact the aquatic and benthic ecosystems, and a Ca/Mg ratio that promotes the growth of the cultivates species when applied as a powder or a slurry. For applications such as a marine paint, the powder product or the slurry product is mixed with various agents to form a setting coating, and is applied to the infrastructure that is otherwise subject to biofilm growth.

## Claims

### Claim 1

A chemical composition for use as a biocide comprising a powder of micron scale calcined particles comprising a mixture of
a) at least one calcined carbonate compound containing oxygen defects selected from the group consisting of magnesite and dolomite, wherein the at least one calcined carbonate compound results from calcining at a temperature of about 750° C.;
b) at least one calcined hydroxide compound selected from the group consisting of brucite and magnesium hydroxide, wherein the at least one calcined hydroxide compound results from calcining at a temperature that is about 450° C.; and
(c) at least one component selected from the group consisting of ground limestone, lime, and hydrated lime,
wherein the particle size distribution of the powder is 0.4-10 microns, the particles have a porosity of greater than 0.5 and wherein the pore surface is largely composed of nano-crystalline structures.

### Claim 2 (depends on 1)

A chemical slurry composition for use as a biocide comprising the powder of claim 1 and further comprising carboxylic acid and at least one additive selected from the group consisting of hydrogen peroxide and ozone.

### Claim 3 (depends on 1)

The chemical composition of claim 1, wherein the composition is applied as a coating material.

### Claim 4 (depends on 1)

A chemical foam, spray, or emulsion composition for use as a biocide comprising the powder of claim 1 and further comprising oil.

### Claim 5 (depends on 2)

The chemical slurry composition according to claim 2, wherein the carboxylic acid is acetic acid and the coating material sets when applied to a surface.

### Claim 6 (depends on 3)

A chemical coating composition according to claim 3, further comprising acrylic material or graphene fibers.

### Claim 7 (depends on 1)

A chemical slurry composition for use as a biocide comprising the powder of claim 1, wherein the carbonate compound is dolomite that has been processed to MgO.CaCO3.

### Claim 8 (depends on 1)

The chemical powder composition according to claim 1 further comprising at least one additive selected from the group consisting of ozone and hydrogen peroxide.