Hydrozincite containing zinc carbonate hydroxide hydrate and method of making

摘要

An inorganic composition that is useful as an active ingredient for pharmaceuticals and has excellent stability comprises hydrozincite-containing zinc carbonate hydroxide hydrate produced by drying a precipitate. The precipitate is obtained by adding aqueous zinc nitrate solution, aqueous zinc sulfate solution or aqueous zinc chloride solution and aqueous sodium hydroxide solution dropwise to aqueous sodium hydrogen carbonate solution, a pH of the aqueous sodium hydrogen carbonate solution being maintained within a range of 6.5 to 9 by means of a pH controller. The hydrozincite-containing zinc carbonate hydroxide hydrate has an amount of dissolved Zn²⁺ ions of not less than 0.1 μg/m² but not more than 7.33 μg/m² and pH of not less than 7.2 and less than 8.3 after a dissolution test using stirring method.