Class 423/173 - Treating impure carbonate (e.g., oyster shells, etc.)

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Processes wherein the original mixture contains the carbonate
No. of patents: 35
Last issue date: 10/21/2008

Number	Title	Issue Date
7438756	Method of improving material comprising a pozzolanic component The invention relates to a method of improving a material comprising a pozzolanic component. According to the invention the material is treated with an aqueous liquid resulting in treated, calcium-depleted material and a calcium-enriched aqueous solution, which are ...	10/21/2008
7396521	Heat transfer fluids with hetero-nanocapsules A heat transfer fluid with hetero-nanocapsules. The heat transfer fluid comprises a fluid and a plurality of hetero-nanocapsules, uniformly dispersed in the fluid, in an amount of 0.01 to 10 parts by weight, based on 100 parts by weight of the heat transfer fluid. S...	07/08/2008
7393558	Methods for producing protective coatings A protective coating on a metal surface comprises a particulate material produced by a method including heating an animal skeletal material to a temperature of at least 1000° C. for a time sufficient to convert at least part of the calcium carbonate in the skeletal...	07/01/2008
7273596	Method of producing granulated anhydrous dicalcium phosphate A new and useful method of simultaneously producing and granulating anhydrous dicalcium phosphate is provided. Such a method entails the reaction of concentrated phosphoric acid with a powdered material of lime and/or calcium carbonate in substantially equal stoichi...	09/25/2007
7252713	Mesoporous glass as nucleant for macromolecule crystallisation A method of facilitating the crystallisation of a macromolecule comprising the step of adding a mesoporous glass to a crystallisation sample wherein the mesoporous glass comprises pores having diameters between 4 nm and 100 nm and has a surface area of at least 50 m...	08/07/2007
7105139	Stabilization of the viscosity of formamidine sulfinic acid bleached calcium carbonate slurries Bleaching a particulate calcium carbonate aqueous slurry with a reductive bleaching agent such as formamidine sulfinic acid increases the viscosity of the slurry. Combining the slurry with a metal material such as strontium hydroxide reduces any increase in viscosit...	09/12/2006
6777542	Method and apparatus for reducing the calcium and phosphorous ratio and increasing crude protein in shellfish waste meal This invention relates to a method and apparatus for the processing of shellfish waste meal. More particularly, to increasing the crude protein while decreasing calcium and phosphorus levels of shellfish waste meal. The method significantly reduces the percent calci...	08/17/2004
5711802	Heat treatment of lime sludge A method and plant for heat treatment of lime sludge (CaCO3) formed by the causticizing process during the manufacture of paper pulp. The lime sludge is dried and pulverized in a first process stage and preheated in a second process stage by me...	01/27/1998
5690897	Method for purification of calcium carbonate A method for lowering the iron content of calcium carbonate is disclosed. The method involves addition of an iron chelating agent to an aqueous calcium carbonate slurry, reducing the pH of the aqueous calcium carbonate by employing carbon dioxide containi...	11/25/1997
5498362	Process for the production of road deicers from water plant residuals An improved process for the production of road deicer products preferably containing calcium magnesium acetate or calcium magnesium acetate/calcium magnesium propionate is provided. The process involves first providing a residual water plant sludge starti...	03/12/1996
5476642	Magnesium hydroxide and process for production thereof Magnesium hydroxide of the formula Mg(OH)2 having a crystallite size in the direction greater than 150 Å and smaller than 500 Å, an aspect ratio in the range from 2 to 5, a strain in the direction not greater than 4.2×10-3	12/19/1995
5409714	Antimicrobial agent and method for sustaining freshness of food An antimicrobial agent contains a calcined product of a calcium oxide type prepared by calcining shells of an oyster and/or a calcined product of a calcium hydroxide type as a hydrate of the calcined product of the calcium oxide type....	04/25/1995
5188814	Method of bleaching The invention concerns a method of bleaching particles containing calcium carbonate by keeping them in contact with an aqueous solution containing hydrogen peroxide and having a pH-value below 8....	02/23/1993
5122350	Method for preparing calcium magnesium acetate and a residual mineral product by selectively calcining dolomite Fermentors, reactors and processes for preparing magnesium enriched calcium magnesium acetate (CMA) (Mg:Ca mole ratios of 1:1 to 20:1) by reacting a dolomitic lime product with a Mg:Ca mole ratio less than one with dilute acetic acid, such as in fermentat...	06/16/1992
5084254	Natural calcium carbonate ores There is disclosed a process for purifying a calcium carbonate-containing mineral which process comprises the following steps: a) mixing the calcium carbonate-containing mineral with water and a dispersing agent to form a suspension containing from 60% to 80% ...	01/28/1992
4978516	Process for treating talc A process for improving a purity and/or whiteness degree of a talc powder is disclosed. A talc powder with a particle size of about 0.8 mm or less containing impurities such as asbestos, etc. is treated with a phosphoric acid agent under heating at from 7...	12/18/1990
4937056	Process for obtaining high purity magnesium compounds from magnesium containing materials Processes for the selective leaching of magnesium-containing solids, which contain calcium and/or heavy metals, and the selective precipitation and crystallization of the leached magnesium are provided. The leaching is conducted with aqueous sulphur dioxi...	06/26/1990
4875938	Method of making a mortar binder and product A method of making a mortar binder including the steps of heating marine shell material to a predetermined high range of temperature, allowing the material to cool, mixing with the material a predetermined proportion of water, which may be sea water, allo...	10/24/1989
4824653	Method of bleaching limestone A method for improving the brightness of limestone utilizing a chelating agent and a bleaching agent in a limestone slurry in which the pH of the slurry is normally between 9.0 and 9.6....	04/25/1989
4770860	Porous hydroxyl apatite material A porous hydroxyl apatite material is disclosed which is made from calcium-rich basic skeletons of lime-encrusting algae converted into hydroxyl apatite and which serves for use as artificial bone, artificial tooth root, augmentation material, stabilizati...	09/13/1988
4606836	Continuous process for the manufacture of calcium magnesium acetate deicer Finely divided lime, at any degree of slaking, is introduced in a steady stream into an agitated reactor designed to produce pellets or aggregates. Concentrated acetic acid is simultaneously introduced in a steady stream at a rate equal to the chemical co...	08/19/1986
4572825	Process for bleaching natural chalk For bleaching natural chalk, an aqueous suspension consisting of 50 to 80% by weight fine-grained natural chalk and 50 to 20% by weight water and containing 0.1 to 1.5% by weight, based on the dry weight of the chalk, of a dispersant and optionally contai...	02/25/1986
4508690	Method of producing very pure magnesium oxide Very pure magnesium oxide is obtained from ore containing magnesium, more particularly ore containing magnesium carbonate, by calcining the ore and leaching the resulting magnesium oxide with carbon dioxide and calcium chloride solution to produce magnesi...	04/02/1985
4488978	Coarse-particle calcium/magnesium acetate suitable for roadway and walkway deicing, and process for its manufacture A process for the manufacture of calcium acetate pellets suitable for surface deicing, which comprises slow addition of water to dried calcium acetate or to calcium acetate freshly prepared from reaction of hydrated or unslaked lime with concentrated acet...	12/18/1984
4474737	Process of purification of magnesic raw material Process of purification of magnesic raw material. Sulphur dioxide is allowed to react with an aqueous suspension of calcinated magnesite, crude or contaminated magnesium oxide, magnesium hydroxide, hydrated magnesium carbonates, or crude crystals of magne...	10/02/1984
4444672	Process of making calcium acetate deicing agents and product A process of making a calcium acetate-containing solution having a pH value at room temperature between about 7 and about 8 is provided comprising reacting acetic acid with a carbonate compound, adding calcined limestone, and optionally finishing off the ...	04/24/1984
4430242	Novel road and highway deicer and traction agent, and process for its manufacture A process of reacting aqueous acetic acid and crushed raw limestone in such a way as to produce a mixture of calcium acetate, calcium acid-acetate, and unreacted raw limestone devoid of undesirable fine limestone. Such a product is useful in winter highwa...	02/07/1984
4426308	Process of making calcium acetate deicing agents A process of making a calcium acetate-containing solution having a pH value at room temperature between about 7 and about 8 is provided comprising reacting acetic acid with a carbonate compound, adding calcined limestone, and optionally finishing off the ...	01/17/1984
4389323	Process of making two uniform grades of calcium magnesium acetate A process of making different grades of calcium magnesium acetate deicing agents, having substantially uniform but different calcium-to-magnesium mole ratios, from limestone having varying proportions of calcium carbonate and magnesium carbonate, is provi...	06/21/1983
4377488	Process of making calcium acetate deicing agents A process of making a calcium acetate-containing solution having a pH value at room temperature between about 7 and about 8 is provided comprising reacting acetic acid with a carbonate compound, adding calcined limestone, and optionally finishing off the ...	03/22/1983
4239736	Method for increasing the brightness of limestone Method for improving the brightness of limestone utilizing a flocculating agent and a bleaching agent where the pH of the slurry is between about 7 and 9....	12/16/1980
4238459	Chemical beneficiation of phosphatic limestone and phosphate rock with ଱-hydroxysulfonic acids A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are ...	12/09/1980
4176157	Calcining calcium sulphate dihydrate A method and apparatus for calcining calcium sulphate dihydrate in a calcination vessel in which the dihydrate is heated in the vessel to calcination temperature not only by heat applied to the exterior of the vessel but also by hot gas, especially hot ga...	11/27/1979
4154802	Upgrading of magnesium containing materials This invention is concerned with the recovery of relatively pure magnesia from magnesite which is normally contaminated with too much silica and silicates to permit the magnesite simply to be calcined for the recovery of refractory grade magnesia. The mag...	05/15/1979
4066735	Process for demineralization of crustacea shells This disclosure is concerned with the demineralization of crustacea shells and the like, before or after protein removal therefrom, with sulfurous acid, thus to convert the calcium carbonate of the shell to calcium bisulfite solution which may be separate...	01/03/1978

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Class 423/173 - Treating impure carbonate (e.g., oyster shells, etc.)