Abstract

FAJARDO, JONNY ARIEL et al. STUDY OF CHEMICAL METHODS FOR CYANIDE REMOVAL FROM CYANIDATION WASTE COMING FROM THE GOLD VEIN EXTRACTION PROCESS IN THE DEPARTMENT OF NARIÑO. Luna Azul [online]. 2010, n.31, pp.8-16. ISSN 1909-2474.

This research focused on laboratory-scale neutralization of cyanide wastes from the Nueva Esparta mine in the municipality of Los Andes, Sotomayor (Nariño) with three commercial type neutralizers in different weight ratios (neutralizer grams / CN-free/total to be neutralized): hydrogen peroxide H₂O₂ 2/1, 5/1 and 8/1, sodium hypochlorite NaOCl 7/1, 12/1 and 17/1 and ferrous sulfate FeSO4 6/1, 12/1 and 18/1. Residual sands were treated as follows: washing with water, neutralization of the washing water and circulation of the same water for a new washing process, this with the purpose of minimizing the quantity of water used. After the statistic analysis and taking into account technical, economical and environmental considerations, it was found that the best treatments for removing free and total cyanide are respectively the relations 2/1 and5/1 from H₂O₂. A physical-chemical characterization of the water source affected by the activity on the poor cyanide solution and solutions lixiviated in the laboratory of the mine under study was performed. In the evaluation of the metals Fe, Cu, Ni, Zn, Mn and Pbit was observed that after the neutralization with con H₂O₂, the analyzed metals diminished their concentration. There was an increase in the majority With NaOCl woth a minimum removal of lead and manganese. With FeSO4 there was removal for the majority but lead and manganese increased.

Keywords : Cyanide; removal; cyanide; residual sand; gold mining.

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