Patent ID: 7815709
Filing Date: 2010-10-19
Classification: C22B,Y02P

Abstract:
1. An electro-hydrometallurgical process that extracts zinc from electric arc furnace dust to produce zinc of high purity and fine particle size, comprising: leaching electric arc furnace dust with an alkaline solution to form a zincates solution; separating the zincates solution into a liquid portion and a gangue portion; inertizing the gangue portion; purifying the liquid portion by cementation and separating precipitated solids from the liquid portion; purifying the liquid portion by adsorption, wherein the liquid portion is submitted to adsorption by percolation with Ba(OH) at least partially evaporating a resulting purified solution to form a concentrated solution; bleeding at least a fraction of the concentrated solution; crystallizing at least a fraction of the concentrated solution; electro-depositing zinc from the concentrated solution; and separating, washing and drying deposited Zn.