| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for separating lead from an aqueous cobalt chloride solution by which a refined liquid suitable for obtaining high purity metal cobalt etc. can be obtained by separating and removing lead from an aqueous cobalt chloride solution containing trace amounts of lead. <P>SOLUTION: This method is characterized by including: a first step where a sulfurizing agent and a pH adjuster are added to a lead-containing aqueous cobalt chloride solution (A) and an oxidation/reduction potential value (based on an Ag/AgCl electrode) and a pH value are adjusted to -50 to 0 mV and 1.0 to 2.0, respectively, and hereby lead sulfide precipitates are formed to obtain an aqueous cobalt chloride solution (B) containing <1.0 mg/L lead; and a second step where an oxidizing agent and a pH adjuster are added to the aqueous cobalt chloride solution (B) and an oxidation/reduction potential value (based on an Ag/AgCl electrode) and a pH value are adjusted to 910 to 1,050 mV and 2.2 to 3.0, respectively, and hereby lead oxide precipitates are formed to obtain a refined liquid from which lead is separated. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
