50results about How to "High arsenic removal rate" patented technology

The invention discloses an arsenic removal method in a nickel electrolysis mixed acid system. According to the method, the iron-arsenic ratio of anodic electrolyte is reasonably controlled through iron supplementation, and meanwhile, the temperature and pH value of an iron removal process are controlled, so that 80% or more of arsenic is separated out in an iron arsenate or adsorption form in the iron removal process; then, in the cobalt removal stage, the cobalt removal oxidation potential, reaction time and pre-cobalt-removal liquor pH value are controlled, and remaining arsenic in iron removal and arsenic removal filtered liquor is removed with cobaltous hydroxide at the cobalt removal stage in a coprecipitation manner. Besides, iron removal and arsenic removal filtered slag generated by purification and cobalt removal and arsenic removal filtered slag are subjected to nickel removal treatment and then filtered, filtered liquor returns to liquor making for treatment, part of arsenic is brought to the liquor making process, and arsenic removal is induced by controlling solution copper ions and electric current density in the liquor making process. By means of the method, the problem that arsenic contained in nickel electrolysis exceeds standards is well solved, the arsenic contained in electrolysis new liquor is smaller than 0.0002 g / l, the arsenic contained in electrolytic nickel is smaller than 0.0005%, and the arsenic removal rate in a solution of a whole system reaches 98% or above.