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    • 3. 发明授权
    • Method for recovering gallium value from aqueous solution of crude
aluminum salt
    • 从粗铝盐水溶液中回收镓值的方法
    • US4986969A
    • 1991-01-22
    • US394940
    • 1989-08-17
    • Koichi Tanihara
    • Koichi Tanihara
    • C01G15/00C01F7/47C22B58/00
    • C22B58/00
    • An efficient method is proposed for the recovery of a trace amount of a gallium value from an aqueous solution containing a large amount of an aluminum salt as the principal solute as in the solution which is prepared by dissolving the precipitates obtained by neutralizing a Bayer's solution with carbon dioxide in hydrochloric or sulfuric acid. The method comprises admixing the aqueous solution with a water-soluble ferrocyanide compound, e.g., sodium ferrocyanide, as a precipitant of gallium ferrocyanide in such a controlled small amount as not to exceed 2.5 times by moles of the gallium ions in the starting solution so that coprecipitation of aluminum ferrocyanide is minimized.
    • 提出了一种从含有大量铝盐作为主要溶质的水溶液中回收痕量镓值的有效方法,如通过将通过将拜耳溶液中和而获得的沉淀物溶解而制备的溶液, 二氧化碳在盐酸或硫酸中。 该方法包括将水溶液与水溶性亚铁氰化物化合物(例如亚铁氰化钠)混合,作为亚砷氰酸镓的沉淀剂,其控制量少至不超过起始溶液中镓离子摩尔数的2.5倍,使得 铝氰化亚铝的共沉淀最小化。
    • 5. 发明授权
    • Method for the preparation of guanidine sulfamate
    • 制备氨基磺酸胍的方法
    • US4388474A
    • 1983-06-14
    • US241236
    • 1981-03-06
    • Koichi Tanihara
    • Koichi Tanihara
    • C07C279/02C07C67/00C07C239/00C07C307/02C07C143/837
    • C07C307/02
    • The invention provides a novel method for the preparation of guanidine sulfamate from the reaction mixture of urea and an ammonium aqua-ammonosulfate, e.g. ammonium imidosulfonate, obtained by the reaction under atmospheric pressure followed by hydrolysis with water. Different from conventional procedures, the hydrolysis in the inventive method is carried out at a temperature not exceeding 100.degree. C. or, preferably, at about 70.degree. C., in which the retardation of the reaction velocity at the lower temperature is compensated for by admixing the aqueous solution of the reaction mixture with a portion of the hydrolysis product obtained in the preceding run. After completion of the hydrolysis reaction, the hydrolysis product is admixed with calcium hydroxide or oxide and the desired guanidine sulfamate is obtained from the liquid portion from which the excess of the calcium ions has been removed.
    • 本发明提供了一种从尿素和氨基硫酸铵的反应混合物制备氨基磺酸胍的新方法, 通过在大气压下反应然后用水水解获得的亚氨基磺酸铵。 与常规方法不同,本发明方法中的水解在不超过100℃或优选在约70℃的温度下进行,其中在较低温度下的反应速度的延迟由 将反应混合物的水溶液与前述流程中获得的水解产物的一部分混合。 水解反应完成后,水解产物与氢氧化钙或氧化物混合,所需的氨基磺酸氨基磺酸盐由已除去过量钙离子的液体部分得到。