Ministry of Higher and Secondary Special Education of the Republic of Uzbekistan Almalyk branch of Tashkent State Technical University named after Islam Karimov Faculty of Energy and Mechanical Engineering Department of Chemical Technology

During cementation, the solution is hydrolyzed in the presence of cobalt, nickel, copper, zinc dust and hydrogen, forming a precipitate of zinc sulfate. Simultaneously in the form of zinc oxide sulfate ZnSO4·3Zn(OH)2+4H2O zinc hydroxide and sulfate are insoluble during cementation. In the regeneration process, the return of the anode and cathode fields occurs in the presence of zinc metal.

• During cementation, the solution is hydrolyzed in the presence of cobalt, nickel, copper, zinc dust and hydrogen, forming a precipitate of zinc sulfate. Simultaneously in the form of zinc oxide sulfate ZnSO4·3Zn(OH)2+4H2O zinc hydroxide and sulfate are insoluble during cementation. In the regeneration process, the return of the anode and cathode fields occurs in the presence of zinc metal.
• Zn+2H2O=Zn(OH)2+H2
• 3Zn(OH)+ZnSO4+4H2O=ZnSO4·3Zn(OH)2·H2O