# US 10,870,585 B2 · Production of calcium carbonate via solid-state calcium hydroxide particles and carbon dioxide, and associated systems and methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,585 B2 - Document ID: US10870585B2 - Status: Granted - Kind: B2 - Application number: 16/572,896 - Filed: 2019-09-17 - Published: 2020-03-19 - Granted: 2020-12-22 - Earliest claimed: 2018-09-17 - Assignees: Graymont (PA) Inc. - Applicants: Graymont (PA) Inc. - Inventors: Brent LaMar; Jared Ira Leikam; Joseph Lewis - Web page: https://patentgrep.com/patent/US10870585B2 ## CPC - C01F 11/18: Carbonates - B01J 19/0053: {Details of the reactor} - C01P 2006/80: Compositional purity - C01P 2006/82: water content - 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}) - 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 Methods and systems for producing calcium carbonate from calcium hydroxide and carbon dioxide are disclosed herein. In some embodiments, a method for producing calcium carbonate comprises (i) providing a first plurality of particles comprising solid-state calcium hydroxide, and (ii) introducing a gas stream comprising carbon dioxide to the first plurality of particles to produce a second plurality of particles comprising calcium carbonate. Individual ones of the first plurality of particles can include a specific surface area of at least 20 m2/g and a free moisture content of from 2% to 20%. The second plurality of particles comprising calcium carbonate are not produced via precipitation. ## Claims ### Claim 1 A method for producing calcium carbonate from calcium hydroxide and carbon dioxide, comprising: providing a first plurality of particles comprising solid-state calcium hydroxide, individual ones of the first plurality of particles including (i) a specific surface area of at least 20 m2/g and (ii) a free moisture content of from 2% to 20% by weight; and introducing a gas stream comprising carbon dioxide to the first plurality of particles to produce a second plurality of particles comprising at least 40% by weight solid-state calcium carbonate, wherein the second plurality of particles are not part of a liquid slurry comprising precipitated calcium carbonate. ### Claim 2 (depends on 1) The method of claim 1, wherein introducing the gas stream comprises introducing the gas stream such that the carbon dioxide of the gas stream directly contacts the calcium hydroxide of the first plurality of particles to produce the calcium carbonate of the second plurality of particles. ### Claim 3 (depends on 2) The method of claim 2, wherein the gas stream comprises at least 30% by weight carbon dioxide. ### Claim 4 (depends on 1) The method of claim 1, wherein providing the first plurality of particles comprises providing the first plurality of particles to a conditioner, and wherein introducing the gas stream comprises introducing the gas stream to the conditioner. ### Claim 5 (depends on 1) The method of claim 1, wherein the first and second pluralities of particles are not part of a liquid slurry comprising precipitated calcium carbonate. ### Claim 6 (depends on 1) The method of claim 1, wherein the second plurality of particles comprising calcium carbonate is not produced via precipitation. ### Claim 7 (depends on 1) The method of claim 1, wherein the second plurality of particles comprises at least 95% by weight calcium carbonate. ### Claim 8 (depends on 1) The method of claim 1, wherein: the first plurality of particles comprises at least 90% by weight calcium hydroxide, providing the first plurality of particles comprises providing the first plurality of particles to a conditioner, and introducing the gas stream includes injecting the gas stream to the conditioner, thereby causing the carbon dioxide of the gas stream to directly contact at least a portion of the first plurality of particles. ### Claim 9 (depends on 1) The method of claim 1, wherein the gas stream is a first gas stream, the method further comprising: after introducing the first gas stream, grinding at least a portion of the second plurality of particles to produce a third plurality of particles comprising a first concentration of calcium carbonate; and after grinding, introducing a second gas stream comprising carbon dioxide to the third plurality of particles to produce a fourth plurality of particles comprising a second concentration of calcium carbonate greater than the first concentration of calcium carbonate. ### Claim 10 (depends on 9) The method of claim 9, further comprising, while grinding, introducing a third gas stream comprising carbon dioxide to the second plurality of particles. ### Claim 11 (depends on 1) The method of claim 1, wherein the gas stream comprising carbon dioxide is received from a lime kiln, and wherein the carbon dioxide comprises at least about 40% by weight of the gas stream. ### Claim 12 (depends on 1) The method of claim 1, wherein individual ones of the first plurality of particles have a free moisture content of from about 10% to 20% by weight. ### Claim 13 A method for producing calcium carbonate from calcium hydroxide and carbon dioxide, comprising: providing a first plurality of particles comprising solid-state calcium hydroxide to a conditioner, individual ones of the first plurality of particles including (i) a specific surface area of at least 20 m2/g and (ii) a free moisture content of from 2% to 20% by weight; and introducing a gas stream comprising carbon dioxide to the conditioner such that the carbon dioxide directly contacts the first plurality of particles to produce a second plurality of particles comprising at least 40% by weight solid-state calcium carbonate, wherein the second plurality of particles are not part of a liquid slurry comprising precipitated calcium carbonate. ### Claim 14 (depends on 13) The method of claim 13, wherein providing the first plurality of particles comprises directing the first plurality of particles from a hydrator to the conditioner. ### Claim 15 (depends on 13) The method of claim 13, wherein the first and second pluralities of particles are not part of a liquid slurry comprising precipitated calcium carbonate. ### Claim 16 (depends on 13) The method of claim 13, wherein the gas stream comprises at least 30% by weight carbon dioxide. ### Claim 17 (depends on 13) The method of claim 13, wherein the first plurality of particles comprise a specific surface area of at least 30 m2/g.