Preparation method of superior pure cobalt chloride

Abstract

The invention relates to a preparation method of superior pure cobalt chloride. The preparation method comprises the following steps of: (1) reacting metallic cobalt with hydrochloric acid; (2) removing impurities, adding hydrogen peroxide into a cobalt chloride solution obtained in the step (1), oxidizing to remove iron, adjusting the solution by using ammonia water until the PH value is 8-9 so as to ensure that ferric hydroxide precipitates completely, standing for 3-5 hours, and filtering to obtain the solution; and (3) pouring the solution obtained in the step (2) into a glass beaker, adjusting the hydrochloric acid until the PH value is 3-3.5, concentrating at the concentrating temperature of 170-190 DEG C, and when the concentration of the concentrated solution is 38-40 degree/BE, stopping heating, cooling and crystallizing, and centrifuging for separation to obtain the superior pure cobalt chloride. The preparation method comprises the following steps of: reacting metallic cobalt with the hydrochloric, regulating the PH value by adding the hydrogen peroxide and the ammonia water, and removing metal cations, so that precipitation of hydroxide is generated and the superior pure cobalt chloride is prepared.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic compounds, in particular to a preparation method of high-grade pure cobalt chloride. Background technique [0002] High-grade pure cobalt chloride is mainly used for electroplating, ceramic colorants, catalysts, dry and wet indicators, etc. The current method is to add distilled water to hydrochloric acid (relative density 1.18) to react with dicobalt trioxide to obtain cobalt chloride. The cobalt chloride obtained by the method has low purity and high impurity content, and can only be used as a raw material for cobalt salt production. Paint desiccants, glass and ceramic colorants are not competitive in the market. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing superior-grade pure cobalt chloride with low impurity content and high purity. [0004] The technical scheme that...

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Problems solved by technology

[0002] High-grade pure cobalt chloride is mainly used for electroplating, ceramic colorants, catalysts, dry and wet indicators, etc. The current method is to add distilled water to hydrochloric acid (relative density 1.18) to react with dicobalt trioxide to obtain cobalt chloride. The cobalt chloride obtained by this method has low purity and high impurity content, and can only be used as a raw material for the production of cobalt salts. Paint desiccants, glass and ceramic colorants are not competitive in the market