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| Number | Title | Issue Date |
| 7067445 | Extended particle size distribution ceramic fracturing proppant A proppant mixture with an extended particle size distribution exhibits improved properties, such as crush strength and conductivity, as compared with a conventional product with a narrow size distribution. ... | 06/27/2006 |
| 6811602 | Process for preparing silicate porous product A process for preparing a silicate porous product, which comprises a step of forming a clay mineral into a dispersion by means of a dispersant, a step of removing gases dissolved in the dispersion, a step of freezing the dispersion and drying it in its frozen state ... | 11/02/2004 |
| 6780804 | Extended particle size distribution ceramic fracturing proppant A proppant mixture with an extended particle size distribution exhibits improved properties, such as crush strength and conductivity, as compared with a conventional product with a narrow size distribution. ... | 08/24/2004 |
| 6696377 | Clay slurry A process for preparing a ball clay slurry with a casting rate of at least about 50, a modulus of rupture of at least 500 pounds per square inch, and from about 0.1 to about 1.0 weight percent of organic polyelectrolyte. In this process, a digested lignit... | 02/24/2004 |
| 6602341 | Treating kaolinitic clays A method of treating a kaolinitic clay which is intended for use as an ingredient in a ceramic composition which method comprises the steps of: (a) mixing with the kaolinitic clay from 0.1% to 15.0% by weight, based on the dry weight of the kaolinitic clay, of... | 08/05/2003 |
| 6186335 | Process for beneficiating kaolin clays A improved process for beneficiating kaolin clays to remove discoloring impurities is disclosed. The beneficiation of kaolin clay is improved by fractionating a kaolin clay starting material into a lower brightness first fraction having a majority of the ... | 02/13/2001 |
| 5891236 | Process for improving the color and brightness of discolored goethite-containing materials Materials, such as kaolin clays, which are discolored by the presence of goethite mineral impurities are first heated to convert the goethite to hematite and then treated to remove the hematite, whereby the color and brightness of the product are improved... | 04/06/1999 |
| 5810998 | Process for improving the brightness of fine-grained kaolin clays Fine-grained kaolin clays having improved brightness can be produced by (a) using centrifugation to fractionate the clay starting material into finer and coarser fractions, (b) subjecting the coarser fraction to flotation to remove discoloring impurities ... | 09/22/1998 |
| 5743952 | Aqueous suspensions of inorganic materials A process for improving the rheological properties of an aqueous suspension of a particulate inorganic material which comprises the steps of: (a) forming an aqueous suspension of the particulate inorganic material and an effective amount of an anionic pol... | 04/28/1998 |
| 5674315 | Process for preparing a meta-kaolin white pigment from kaolinite A fluidized bed reactor is supplied with fuel, oxygen-containing gas, and kaolinite, which contains water of crystallization. At least 80% by weight of the kaolinite have particle sizes in the range from 0.1 to 3 mm. A fluidized bed at temperatures in the... | 10/07/1997 |
| 5573658 | Low brightness functional pigment from process by-product A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO2. After separating the stained TiO2 from the high brightness kaolin and concentrat... | 11/12/1996 |
| 5529622 | Process for treatment of clay for use as a paper coating pigment A process is disclosed for the production of a blended smectite clay with enhanced rheology, particle size restriction and reduced abrasion characteristics which is useful for the coating of paper. The process comprises slurrying of a predominantly sodium... | 06/25/1996 |
| 5522924 | Method for producing high brightness low abrasion calcined kaolin pigment A process for preparing a high brightness, low abrasion calcined kaolin. A cretaceous crude is wet beneficiated by subjecting same as an aqueous slurry to degritting, classification, magnetic separation, and scrub grinding. The slurry from the foregoing i... | 06/04/1996 |
| 5458680 | Method of producing aggregated composite pigments using organic silicon compounds An improved process for producing a aggregated composite pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by contacting a substantially dry fine particle siz... | 10/17/1995 |
| 5427990 | Method of Improving absorption of salt water by water-swellable clay by redrying A method of treating a water-swellable clay after the clay has been mined and dried to improve its properties when in contact with salt-contaminated water. After the common initial drying of the clay to a moisture content of 12% by weight or less, the cla... | 06/27/1995 |
| 5426079 | Method of improving water-swellable clay properties by re-drying, compositions and articles A method of treating a water-swellable clay, initially having a Fe+3 /Fe+2 ratio of at least 1.0, preferably at least 3.0, and most preferably in the range of about 5.0 to about 15.0, after the clay has been mined and dried. After th... | 06/20/1995 |
| 5423911 | Coating pigment for cellulose - based printing media A coating pigment for coating printing media, especially paper and cardboard, is made with at least one swellable layer silicate which can be fixed on the printing medium essentially without binders, where the amount of swellable layer silicate is at leas... | 06/13/1995 |
| 5424259 | High solids slurries of structured kaolin clay materials having improved high shear rheology and process for the manufacture thereof A high solids structured kaolin clay slurry having improved high shear rheology is manufactured by a process which comprises the sequential steps of forming an aqueous composition by mixing water and a lithium-based dispersant and then mixing structured k... | 06/13/1995 |
| 5385239 | Low brightness functional pigment from process by-product A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO2. After separating the stained TiO2 from the high brightness kaolin and concentrat... | 01/31/1995 |
| 5371051 | Method for producing high opacifying kaolin pigment A method for producing calcined kaolin pigments of high opacifying properties and low abrasion. A kaolin crude is selected having a G.E. brightness in the range of 70 to 80, a titania content of 2.0 to 3.0% by weight, less than 2% iron expressed as Fe | 12/06/1994 |
| 5358120 | Selective separation of finely-divided minerals by addition of selective collector reagent and centrifugation Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or the like to cause the impurities to settle from a dispersed pulp of the clay ... | 10/25/1994 |
| 5318953 | Method of improving water-swellable clay properties by re-drying, compositions and articles A method of treating a water-swellable clay, initially having a Fe+3 /Fe+2 ratio of at least 1.0, preferably at least 3.0, and most preferably in the range of about 5.0 to about 15.0, after the clay has been mined and dried. After th... | 06/07/1994 |
| 5311997 | Selective separation of finely-divided minerals by addition of selective collector reagent and centrifugation Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or hydrocloning to cause the impurities to settle from a dispersed pulp of the c... | 05/17/1994 |
| 5312807 | Method of improving absorption of salt water by water-swellable clay by redrying A method of treating a water-swellable clay after the clay has been mined and dried to improve its properties when in contact with salt-contaminated water. After the common initial drying of the clay to a moisture content of 12% by weight or less, the cla... | 05/17/1994 |
| 5298066 | Method of producing aggregated kaolinite pigment using organic silicon compounds An improved process for producing a aggregated kaolin pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by contacting a substantially dry fine particle size k... | 03/29/1994 |
| 5266539 | Process for the deferrization of kaolin, quartzose sand, paper filler, white pigment, pumice and electronics materials The present invention relates to a process for selectively purifying ceramic materials for glass, paper and electronics use contaminated with iron compounds, the process using ascorbic acid or its derivatives as the iron reducing agent.... | 11/30/1993 |
| 5242874 | Process for whitening kaolin The present invention refers to a process for whitening kaolinitic clays by adding an aqueous acid solution containing sodium bisulfite and atomized aluminum powder, thereby causing the reduction of the contaminating iron ions present in the kaolin, resul... | 09/07/1993 |
| 5232495 | Method of producing aggregated kaolinite pigment using organic silicon compounds An improved process for producing a aggregated kaolin pigment having desired physical and optical characteristics when used as a coating, filler or pigment in paper. The aggregated pigment is produced by mixing an aqueous slurry of a fine particle kaolin ... | 08/03/1993 |
| 5227349 | Process for producing a kaolin clay product A process for producing a high solids aqueous slurry of a beneficiated kaolin. An impure crude kaolin clay is initially subjected to wet processing including a size classification step, to recover a beneficiated fine particle size kaolin fraction which is... | 07/13/1993 |
| 5171725 | Method for preparing aqueous mineral suspensions An improvement is disclosed applicable to systems where a mineral ore, such as a crude kaolin is introduced into a high shear, high energy mixing device with a suspending fluid and dispersing agents added to the same mixing device at controlled rates to p... | 12/15/1992 |
| 5168083 | High opacity defined kaolin product and method of producing same A high opacity, defined kaolin clay product having a relatively narrow particle size distribution, low colloidal particle content and an average particle surface area of less than about 30 square meters per gram is prepared by defining an aqueous kaolin c... | 12/01/1992 |
| 5147458 | Structured pigment from high TiO2 /Fe2 O3 kaolinite reject material A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO2. After separating the stained TiO2 from the high brightness kaolin and concentrat... | 09/15/1992 |
| 5114893 | Method of improving water-swellable clay properties by re-drying, compositions and articles A method of treating a water-swellable clay after the clay has been mined and dried. After the common initial drying of the clay to a moisture content of 12% or less, the clay is re-wetted to a moisture content of more than 12% by weight, preferably at le... | 05/19/1992 |
| 5102837 | Process for the preparation of opaliform porcellanite The present invention provides high grade opaliform porcellanite having a purity of at least 80% active silica. The invention also provides a process for the production of a high grade opaliform porcellanite having a purity of at least 80% active silica c... | 04/07/1992 |
| 5100472 | Deionized clay and paper coatings containing the same Paper coatings composition containing highly deionized clay or calcium carbonate are disclosed; the compositions provide equivalent rheology at up to 4% higher solids; the compositions provide enhanced glossability; the highly deionized clay and calcium c... | 03/31/1992 |
| 5034062 | Use of acid-containing anionic emulsion copolymers as calcined clay slurry stabilizers A stabilized aqueous suspension of calcined clay and a method for preparing the same are provided. The method involves an aqueous suspension of calcined clay containing at least 10% by weight clay, and at least 0.05% by weight of a high charge density cro... | 07/23/1991 |
| 4981824 | Novel ceramic material, method for the preparation thereof and ceramic shaped body obtained therefrom A novel ceramic material affording a ceramic molded bodies having a high toughness and a high tensile strength is disclosed which comprises a smectite clay mineral having at least a portion of ion-exchangeable cations thereof ion-exchanged with bismuth io... | 01/01/1991 |
| 4929580 | Process for treating clay minerals There is disclosed a process for treating a clay mineral thereby to change its rheological properties when in aqueous suspension such that the fluidity of the aqueous suspension at a given temperature and percentage by weight of completely deflocculated c... | 05/29/1990 |
| 4916094 | Method for producing high solids kaolin slurry A bleached, dispersed, high solids slurry is produced from unprocessed crudes at low pH and with minimum work input, using polyacrylic acid as the dispersant. The process involves making the slurry at the highest solids possible without resorting to filtr... | 04/10/1990 |
| 4888315 | High solids blended kaolin clay slurry A high solids kaolin clay slurry having unexpectedly improved high shear viscosity is prepared by blending a chemically dispersed fine particle size Tertiary kaolin with a coarser particle size Cretaceous kaolin to provide a resultant blend having a contr... | 12/19/1989 |
