PROCESS AND SYSTEM FOR SEPARATION, RECYCLING AND SUSTAINABLE ENVIRONMENTAL STABILISATION OF ACID EFFLUENTS WITH ARSENIC (AS) AND/OR HEAVY METALS WHICH FORM INSOLUBLE SULPHIDES

摘要

The invention of the present application discloses a process and a system for separation, removal and sustainable environmental stabilisation of arsenic (As), separately recovering other metals and metalloids and producing ammonium sulphate, from acid dissolving of arsenic and heavy metals which form insoluble sulphides, such as aluminium (Al), copper (Cu), zinc (Zn), lead (Pb), antimony (Sb), silicon (Si), iron (Fe), bismuth (Bi), selenium (Se) and mercury (Hg), present in industrial liquid effluents having a high As content (preferably from approximately 50 to 50 000 mg/l), principally those originating from acid solutions resulting from scrubbing gases from works smelting sulphurated minerals of copper (Cu); of zinc (Zn); of lead (Pb), and of nickel (Ni). Diverse other metals may also be present depending on the source and the process from which the water originates, being separated insofar as they form insoluble sulphides at a pH lower than 5.