PROCESS FOR THE TREATMENT OF ACIDIC WASTE LIQUID CONTAINING DISSOLVED FERROUS SALTS

摘要

"PROCESS FOR THE TREATMENT OF ACIDIC WASTE LIQUID CONTAINING DISSOLVED FERROUS SALTS" A process for the treatment of aqueous sulphuric acid solutions of a ferrous salt wherein the pH value of the solution is adjusted by the addition of a calcium compound to selectively precipitate calcium sulphate after which the precipitated calcium sulphate is separated and calcined before adjusting the pH of the mother liquor to a value in the range 7 to 9 by the addition of a calciumcontaining compound to precipitate therefrom solid metal compounds which are then separated and/or calcined.