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precipitated calcium carbonate manufacturing process patents

US6251356B1 - High speed manufacturing process for ...

A process for the production of precipitated calcium carbonate. A slurry of calcium hydroxide is agitated in a pressurized reactor, and carbon dioxide is provided under pressure to the reactor to produce precipitated calcium carbonate at a high reaction rate. Carbon dioxide is utilized at a high efficiency. Solubilized calcium ions and carbonate ions react to produce a calcium carbonate ...

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High speed manufacturing process for precipitated

A process for the production of precipitated calcium carbonate. A slurry of calcium hydroxide is agitated in a pressurized reactor, and carbon dioxide is provided under pressure to the reactor to produce precipitated calcium carbonate at a high reaction rate.

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US20020172636A1 - Process for the continuous

A process for continuously producing precipitated calcium carbonate having a controllable particle diameter, in which nucleation and crystal growth are carried out in separate phases or phases. The size of the calcium carbonate particles is determined and/or controlled by the concentration of the calcium hydroxide suspension and by the ratio of CO 2 introduced to the volume of Ca(OH) 2 ...

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Method and apparatus for production of precipitated ...

This patent pertains to the methods, process conditions, and equipment required for the high speed manufacture of precipitated calcium carbonate (PCC) and the production of calcium silicate hydrate (CSH), having a novel structure and composition of matter, employing common manufacturing

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US20030051841A1 - Method and apparatus for

A method and apparatus for the production of calcium carbonate and calcium silicate in common superatmospheric reactors. Multiple reactors can be provided for switching production between reactors, and advantageously utilizing process waste heat. On site production of both PCC and Calcium Silicate Hydrates is thus achieved in a paper mill.

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KR20160147281A - Production of precipitated calcium ...

The present invention relates to a process for the preparation of an aqueous suspension of precipitated calcium carbonate, which comprises mixing water, a calcium oxide-containing material, at least one water-soluble polymer having a molecular weight (M w ) in the range of 200 to 6500 g / mol and at least one digesting additive To produce a lime oil, followed by carbonation of the lime oil to ...

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Process for production of PCC - Omya Development AG

The invention claimed is: 1. A process for production of precipitated calcium carbonate by carbonation of calcium hydroxide, comprising performing in two or more separate reaction vessels the steps of: i) contacting calcium hydroxide with a gas comprising carbon dioxide to allow formation of calcium carbonate in a first reaction vessel, and then ii) transferring a part of the calcium hydroxide ...

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PROCESS FOR PREPARING SCALENOHEDRAL

2015-10-2  The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing slaking quick lime to obtain slaked lime; and subjecting the slaked lime, without agitation, without prior cooling in a heat exchanger, and in the absence of any additives, to carbonation with carbon dioxide gas to produce PCC.

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Process for production of rhombic shaped precipitated ...

A process for producing rhombic or barrel shaped precipitated calcium carbonate. Quicklime is slaked in an aqueous solution containing about 0.1% to about 2% by weight of a sugar, based upon the weight of the CaCO 3 to be produced. Carbon dioxide is added to the slaked lime slurry at a preferred temperature of about 50° F.-70° F. until the pH drops from about 11-12 to about 7-8.

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US Patent for Precipitated calcium carbonate-cationic ...

4. A binder system according to claim 3 wherein the precipitated calcium carbonate has a surface area of 50-90 m.sup.2 /g, a mean particle size of 0.1-0.3.mu.m and a zeta potential of -10 to -60 mV; the cationic starch a degree of substitution of 0.30% to 0.40% and the ratio of precipitated calcium carbonate:cationic starch is 4 by weight.

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Method and apparatus for production of precipitated ...

This patent pertains to the methods, process conditions, and equipment required for the high speed manufacture of precipitated calcium carbonate (PCC) and the production of calcium silicate hydrate (CSH), having a novel structure and composition of matter, employing common manufacturing

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PROCESS FOR OBTAINING PRECIPITATED CALCIUM

2014-8-8  The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate ...

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Precipitated calcium carbonate - ECC International Limited

1992-11-13  A method of preparing precipitated calcium carbonate which comprises slaking quicklime in an aqueous medium, passing the suspension of calcium hydroxide through a sieve having an aperture size in the range of 40 to 70 microns, carbonating the calcium hydroxide and separating the calcium carbonate from the aqueous medium in which it is suspended.

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PROCESS FOR THE PRODUCTION OF PRECIPITATED

A process for producing precipitated calcium carbonate, including the steps of providing calcium hydroxyde, and carbonating the calcium hydroxyde with carbon dioxyde gas and communicating for a time sufficient to produce a calcium carbonate having at least about a 90 weight percent conversion to calcium carbonate and having a solids concentration of at least about 90 weight percent.

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PROCESS FOR PREPARING SCALENOHEDRAL

2015-10-2  The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing slaking quick lime to obtain slaked lime; and subjecting the slaked lime, without agitation, without prior cooling in a heat exchanger, and in the absence of any additives, to carbonation with carbon dioxide gas to produce PCC.

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US Patent for Precipitated calcium carbonate-cationic ...

4. A binder system according to claim 3 wherein the precipitated calcium carbonate has a surface area of 50-90 m.sup.2 /g, a mean particle size of 0.1-0.3.mu.m and a zeta potential of -10 to -60 mV; the cationic starch a degree of substitution of 0.30% to 0.40% and the ratio of precipitated calcium carbonate:cationic starch is 4 by weight.

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Process for generation of precipitated calcium carbonate ...

An environmental friendly process for the production of precipitated calcium carbonate suitable for industrial application from calcium carbonate rich by-product of nitrophosphate fertilizer plant byadopting purification steps of calcination, carbonation and optional treatment with emulsion of

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US Patent for Production of calcium carbonate via solid ...

2019-9-17  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

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Understanding the Precipitated Calcium Carbonate (PCC ...

2018-3-20  Milk of lime, precipitated calcium carbonate, morphology, particle size, carbonation. 1. Introduction Precipitated calcium carbonate (PCC) is a filler used in many applications, like papers, plastics, rubbers, paints, drugs and so on. Its high purity, well-ordered particle size and morphology makes it the white filler of choice.1 In paint ...

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A Brief review of Aragonite Precipitated Calcium

process [46]. The formation of precipitated calcium carbonate (PCC) in pure ethanol as the solvent was possible without leaving Ca(OH) 2 as reac-tants; among them calcite was first precipitated from the carbonation in bulk solution as in the pure water, while the aragonite and vaterite might have been synthesized via local carbonation occurring ...

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PROCESS FOR OBTAINING PRECIPITATED CALCIUM

2014-8-8  The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate ...

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PROCESS FOR THE PRODUCTION OF PRECIPITATED

A process for producing precipitated calcium carbonate, including the steps of providing calcium hydroxyde, and carbonating the calcium hydroxyde with carbon dioxyde gas and communicating for a time sufficient to produce a calcium carbonate having at least about a 90 weight percent conversion to calcium carbonate and having a solids concentration of at least about 90 weight percent.

More

PROCESS FOR PREPARING SCALENOHEDRAL

2015-10-2  The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing slaking quick lime to obtain slaked lime; and subjecting the slaked lime, without agitation, without prior cooling in a heat exchanger, and in the absence of any additives, to carbonation with carbon dioxide gas to produce PCC.

More

Process for generation of precipitated calcium carbonate ...

An environmental friendly process for the production of precipitated calcium carbonate suitable for industrial application from calcium carbonate rich by-product of nitrophosphate fertilizer plant byadopting purification steps of calcination, carbonation and optional treatment with emulsion of

More

PROCESS FOR GENERATION OF PRECIPITATED CALCIUM

2001-10-31  An environmental friendly process for the production of precipitated calcium carbonate suitable for industrial application from calcium carbonate rich by-product of nitrophosphate fertilizer plant by adopting purification steps of calcination, carbonation and optional treatment with emulsion of fatty acid or its derivatives.

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Process of manufacturing a co-ground calcium carbonate ...

Disclosed is a process of manufacturing co-ground calcium carbonate material comprising ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC), presenting a steepness factor of at least about 30, wherein it comprises the steps of: (a) providing at least one calcium carbonate material in the form of an aqueous suspension wherein the calcium carbonate is GCC, (b) co-grinding GCC ...

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US Patent for Dewatering of calcium carbonate Patent ...

1999-2-23  The present invention relates to dewatering of an aqueous slurry of calcium carbonate. More particularly, the present invention relates to the use of non-ionic surfactants in dewatering aqueous slurries of an aragonitic precipitated calcium carbonate. Calcium carbonate slurries dewatered using the non-ionic surfactants of the present invention have higher weight percent solids, decreased ...

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Project Report on PRECIPITATED CALCIUM CARBONATE ...

2020-10-5  5. precipitated calcium carbonate 6. market survey 7. end use wire consumption of calcium carbonate 8. present manufacturiers 9. manufacturing diagram 10. mnufacturing process 11. plant layout 12. present manufacture of calcium carbonate precipitated 13. addresses of plant

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Understanding the Precipitated Calcium Carbonate (PCC ...

2018-3-20  Milk of lime, precipitated calcium carbonate, morphology, particle size, carbonation. 1. Introduction Precipitated calcium carbonate (PCC) is a filler used in many applications, like papers, plastics, rubbers, paints, drugs and so on. Its high purity, well-ordered particle size and morphology makes it the white filler of choice.1 In paint ...

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Process efficiency and optimisation of precipitated ...

2012-6-18  Process efficiency and optimisation of precipitated calcium carbonate (PCC) production from steel converter slag Hannu-Petteri Mattilaa, Inga Grigaliūnaitėb, Arshe Saidc, Sami Filppulad, Carl-Johan Fogelholme and Ron Zevenhovenf a Thermal and Flow Engineering Laboratory, Åbo Akademi University, Turku, Finland, [email protected], CA

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