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    • 4. 发明授权
    • Use of calcium carbonate in an acidic aqueous media
    • 在酸性水性介质中使用碳酸钙
    • US06228161B1
    • 2001-05-08
    • US08774662
    • 1996-12-30
    • Donald Kendall Drummond
    • Donald Kendall Drummond
    • D21H1764
    • C01F11/18C01F11/185C01P2006/22C01P2006/60C09C1/021D21H17/07D21H17/65D21H17/66D21H17/67D21H17/675D21H17/71
    • The present invention relates to an acid-stabilized calcium carbonate slurry having a pH of less than 7, preferably between about 6 and about 7, containing water, calcium carbonate, preferably precipitated calcium carbonate, and an acid-stabilizer of a water soluble calcium salt, a weak acid, a chelating agent, a weak acid capable of chelating calcium ion, or a mixture thereof. The acid-stabilizer is present in an amount sufficient to provide an aqueous calcium carbonate slurry having an increased calcium ion concentration and an acidic pH. In a typical acid-stabilized calcium carbonate slurry of the invention, the acid-stabilizer is present in an amount sufficient to provide a calcium ion concentration of about 1 millimolar to about 5 molar, preferably from about 1 to about 120 millimolar. The invention also relates to a method of making the acid-stabilized calcium carbonate slurry of the invention, to a method of forming a filled paper, that includes the step of adding the acid-stabilized calcium carbonate slurry of the invention to a papermaking pulp in a process for making acid paper, and to a filled paper produced according to the method of the invention.
    • 本发明涉及pH值小于7,优选约6至约7的含有水,碳酸钙,优选沉淀碳酸钙的酸稳定化碳酸钙浆料和水溶性钙盐的酸稳定剂 ,弱酸,螯合剂,能螯合钙离子的弱酸,或其混合物。 酸稳定剂的存在量足以提供钙离子浓度和酸性pH增加的碳酸钙水泥浆。 在本发明的典型的酸稳定的碳酸钙浆料中,酸稳定剂的存在量足以提供约1毫摩尔至约5摩尔,优选约1至约120毫摩尔的钙离子浓度。 本发明还涉及将本发明的酸稳定化碳酸钙浆料制成填充纸的方法,其包括将本发明的酸稳定的碳酸钙浆料加入到造纸纸浆中的步骤 制造酸性纸的方法,以及根据本发明的方法生产的填充纸。
    • 6. 发明授权
    • Electrolytic purification of calcium carbonate
    • 电解净化碳酸钙
    • US06228249B1
    • 2001-05-08
    • US09343826
    • 1999-06-30
    • Donald Kendall Drummond
    • Donald Kendall Drummond
    • C25B118
    • C01F11/185C01F11/02C01P2006/80C08K2003/265D21H17/675
    • The present invention provides an electrochemical process for reducing metal contaminants in calcium carbonate by solubilizing the metal contaminate in an aqueous solution of calcium carbonate and then removing the solubilized metal contaminant by passing an electrical current through the aqueous calcium carbonate solution containing the solubilized metal contaminant. Calcium carbonate produced according to the process of this invention is particularly suitable for use as food or pharmaceutical additives. The calcium carbonate is also suitable for use in papermaking process as fillers, or coatings, or as additives in the production of plastics, paints and adhesive products. Other uses of high purity calcium carbonate include catalysts and catalyst supports, electrical/semiconductor applications, florescent lighting, and optical/laser applications.
    • 本发明提供了一种用于通过将金属污染物溶解在碳酸钙水溶液中并通过使电流通过含有溶解金属污染物的碳酸钙水溶液来除去溶解的金属污染物来减少碳酸钙中的金属污染物的电化学方法。 根据本发明方法生产的碳酸钙特别适合用作食品或药物添加剂。 碳酸钙也适用于造纸过程中作为填料或涂料,或作为塑料,油漆和粘合剂产品生产中的添加剂。 高纯度碳酸钙的其他用途包括催化剂和催化剂载体,电/半导体应用,荧光照明和光学/激光应用。
    • 7. 发明授权
    • Acid stabilized calcium carbonate an method of making it
    • 酸稳定的碳酸钙是一种制备它的方法
    • US07033428B2
    • 2006-04-25
    • US09826062
    • 2001-04-04
    • Donald Kendall Drummond
    • Donald Kendall Drummond
    • C09C1/02D21H17/64
    • C01F11/18C01F11/185C01P2006/22C01P2006/60C09C1/021D21H17/07D21H17/65D21H17/66D21H17/67D21H17/675D21H17/71
    • The present invention relates to an acid-stabilized calcium carbonate slurry having a pH of less than 7, preferably between about 6 and about 7, containing water, calcium carbonate, preferably precipitated calcium carbonate, and an acid-stabilizer of a water soluble calcium salt, a weak acid, a chelating agent, a weak acid capable of chelating calcium ion, or a mixture thereof. The acid-stabilizer is present in an amount sufficient to provide an aqueous calcium carbonate slurry having an increased calcium ion concentration and an acidic pH. In a typical acid-stabilized calcium carbonate slurry of the invention, the acid-stabilizer is present in an amount sufficient to provide a calcium ion concentration of about 1 millimolar to about 5 molar, preferably from about 1 to about 120 millimolar. The invention also relates to a method of making the acid-stabilized calcium carbonate slurry of the invention, to a method of forming a filled paper, that includes the step of adding the acid-stabilized calcium carbonate slurry of the invention to a papermaking pulp in a process for making acid paper, and to a filled paper produced according to the method of the invention.
    • 本发明涉及pH值小于7,优选约6至约7的含有水,碳酸钙,优选沉淀碳酸钙的酸稳定化碳酸钙浆料和水溶性钙盐的酸稳定剂 ,弱酸,螯合剂,能螯合钙离子的弱酸,或其混合物。 酸稳定剂的存在量足以提供具有增加的钙离子浓度和酸性pH的碳酸钙水泥浆。 在本发明的典型的酸稳定的碳酸钙浆料中,酸稳定剂的存在量足以提供约1毫摩尔至约5摩尔,优选约1至约120毫摩尔的钙离子浓度。 本发明还涉及将本发明的酸稳定化碳酸钙浆料制成填充纸的方法,其包括将本发明的酸稳定的碳酸钙浆料加入到造纸纸浆中的步骤 制造酸性纸的方法,以及根据本发明的方法生产的填充纸。