Process for manufacturing high purity nickel chloride by recycling waste nickel anode

A process for manufacturing nickel chloride as a Zn--Ni electroplating material, comprising the steps of:

• working a waste nickel anode having a specific surface area obtained from an electroplating factory of a steel manufacturing plant into chips so as to provide an increased specific surface area;
• putting the worked waste nickel anode chips into an aqueous hydrochloric acid solution of 10-35% such that equivalence ratios of the number of equivalents of Ni inputted per liter/number of equivalents of a target NiCl.sub.2 concentration and the number of equivalents of HCl inputted per liter/number of equivalents of a target NiCl.sub.2 concentration are 1.0 or more, and dissolving the worked waste nickel anode chips at a reaction temperature of 20.degree.-80.degree. C. so as to form an aqueous nickel chloride solution having the target NiCl.sub.2 concentration, wherein the two equivalence ratios have the same target NiCl.sub.2 concentration;
• having the target NiCl.sub.2 concentration, wherein the two equivalence ratios have the same target NiCl.sub.2 concentration passing said aqueous nickel chloride solution through a filter to remove insoluble materials and adding KOH to adjust the pH to 2-5;
• placing said aqueous nickel chloride solution in an impurity treating tank;
• injecting an oxidizing gas into said aqueous nickel chloride solution in the impurity treating tank with the pH level maintained at 2-5 so as to form Fe and Cr ions into a sludge, and carrying out a filtering step;
• and
• adding a Ni powder in the amount of 0.1-2.0 g/l into said aqueous nickel chloride solution to remove heavy metal ions.

A process for manufacturing nickel chloride by using a waste nickel anode, comprising the steps of:

• pre-treating a waste nickel anode having a specific surface area obtained from an electroplating factory of a steel manufacturing plant to remove impurities adhered on a surface of the waste nickel anode;
• working the pre-treated waste nickel anode into chips so as to provide an increased specific surface area;
• putting the worked waste nickel anode chips into an aqueous hydrochloric acid solution of 10-35% such that equivalence ratios of the number of equivalents of Ni inputted per liter/number of equivalents of a target NiCl.sub.2 concentration and the number of equivalents of HCl inputted per liter/number of equivalents of a target NiCl.sub.2 concentration are 1.0 or more, and dissolving said worked waste nickel anode chips at a reaction temperature of 20.degree.-80.degree. C. so as to form an aqueous nickel chloride solution having the target NiCl.sub.2 concentration, wherein the two equivalence ratios have the same target NiCl.sub.2 concentration;
• stopping the dissolving step by passing said aqueous nickel chloride solution through a filter to remove insoluble materials;
• placing said aqueous nickel chloride solution in an impurity treating tank and adding an alkaline compound to adjust the pH to 2-5;
• injecting an oxidizing gas into said aqueous nickel chloride solution in the impurity treating tank with the pH level maintained at 2-5 so as to form Fe and Cr ions into a sludge, and carrying out a filtering step;
• adding a Ni powder in the amount of 0.1-2.0 g/l into said aqueous nickel chloride solution to remove heavy metal ions;
• and
• heat-concentrating said impurity treated nickel chloride into a crystalline powder.