| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing copper sulfate satisfying specifications as animal feeds, inexpensively. <P>SOLUTION: The method for producing the copper sulfate used for the animal feeds includes heating for concentrating electrolytic solution of copper sulfate, formed from a copper electrolytic refining process and containing sulfuric acid, obtaining crude copper sulfate by performing the solid-liquid separation of crude copper sulfate slurry obtained by rapid cooling, then dissolving the obtained crude copper sulfate with heated water to obtain crude copper sulfate solution, adding a neutralizing agent and an oxidant to adjust pH while agitating the solution, filtering the solution to obtain copper sulfate solution as the mother liquid, heating the mother liquid for concentrating the same, then cooling the liquid to obtain copper sulfate slurry, subjecting the slurry to solid-liquid separation and then drying to obtain copper sulfate crystals, wherein, the pH is set to the range of 2.3 to 3.5. <P>COPYRIGHT: (C)2009,JPO&INPIT |
