Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide

IF 0.7 Q3 ENGINEERING, MULTIDISCIPLINARY

TECCIENCIA Pub Date : 2019-09-09 DOI:10.18180/TECCIENCIA.2018.25.1

Gonzalo Aranguri Llerena, Iván Alberto Reyes López

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引用次数: 5

Abstract

Cyanide ion (CN-) is widely used in different industrial operations, such as jewelry, steel manufacture, gold and silver extraction and electroplating. However, industrial emissions containing the CN- ion have to be treated to comply with environmental regulations. This research aimed to degrade free cyanide (CNL) present in the tailing of a metallurgical plant that processes gold-bearing ores and uses sodium cyanide (NaCN) as a leaching reagent. Sodium metabisulfite (Na2S2O5) and sodium metabisulfite with hydrogen peroxide (Na2S2O5 + H2O2) were used as oxidizing agents. To evaluate the effect of the factors, we used a factorial design with three independent variables: stirring time, reagent excess percentage, type of reagent and a dependent variable: CNL degradation (mg/L). According to the analysis of variance (ANOVA), the variables influenced significantly CNL degradation, being the most relevant the reagent excess percentage and according to the results, the maximum CNL degradation was 97.67% when 400% of Na2S2O5excess was added with 4 hours of stirring.

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偏亚硫酸氢钠和偏亚硫酸氢溶液两种试剂降解矿山废水中氰化物的研究

氰化物离子（CN-）广泛用于不同的工业操作，如珠宝、钢铁制造、金银提取和电镀。然而，含有CN离子的工业排放物必须进行处理，以符合环境法规。本研究旨在降解一家冶金厂尾矿中存在的游离氰化物（CNL），该厂以氰化钠（NaCN）为浸出剂处理含金矿石。使用偏亚硫酸氢钠（Na2S2O5）和具有过氧化氢的偏亚硫酸钠（Na2O5+H2O2）作为氧化剂。为了评估这些因素的影响，我们使用了三个自变量的析因设计：搅拌时间、试剂过量百分比、试剂类型和因变量：CNL降解（mg/L）。根据方差分析（ANOVA），这些变量显著影响CNL降解，其中最相关的是试剂过量百分比，根据结果，当在搅拌4小时的情况下添加400%的Na2S2O5过量时，最大CNL降解为97.67%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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TECCIENCIA ENGINEERING, MULTIDISCIPLINARY-

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