PROCEDURE FOR THE STABILIZATION OF ARSENICAL RESIDUES BY MEANS OF THE PRECIPITATION OF TOOELEITE BY THERMAL STABILIZATION

The invention discloses a process for the stabilization of arsenical waste by means of the precipitation of tooeleite by thermal stabilization, the process comprising the following steps: a first step of neutralization, in which the arsenical effluent is brought into contact with a first neutralizer to generate a first neutralized arsenical effluent; a second step of Fe(III)/As(III) ratio adjustment, in which the first neutralized arsenical effluent is mixed with a first ferric solution, to generate a third arsenic effluent; a third step of arsenic precipitation, in which the pH of the third arsenical effluent is adjusted with a second neutralizer to generate a first arsenical residue slurry; a fourth step of solid-liquid separation, in which the first arsenical residue slurry is separated to generate a fourth arsenical effluent and a first arsenical residue; a fifth step of calcination, in which the first arsenical residue is calcined to generate a second arsenical residue; a sixth step of washing, in which the second arsenical residue is washed with an aqueous solution to generate a second arsenical residue slurry; and a seventh step of solid-liquid separation, in which the second arsenical residue slurry is separated to generate a fifth arsenical effluent and a third stable arsenical residue in the form of tooeleite. The invention solves the technical problem of removing arsenic from arsenical effluents to generate stable arsenical residues which, for their synthesis, do not require an oxidation step to oxidize the arsenous ion to arsenate ion, nor the application of heat in the precipitation step. La invención divulga un procedimiento para la estabilización de residuos arsenicales mediante la precipitación de tooeleita vía estabilización térmica, el proceso comprende los siguientes pasos; un primer paso de neutralización, en donde el efluente arsenical es contactado con un primer neutralizante para generar un primer efluente arsenical neutralizado, un segundo paso de ajuste de relación Fe(III)/As(III), en donde el primer efluente arsenical neutralizado es mezclado con una primera solución férrica, para generar un tercer efluente arsenical, un tercer paso de precipitación de arsénico, en donde se ajusta el pH del tercer efluente arsenical con un segundo neutralizante para generar una primera pulpa de residuo arsenical, un cuarto paso de separación sólido líquido, en donde la primera pulpa de residuo arsenical se separa para generar un cuarto efluente ar