<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1909-3667</journal-id>
<journal-title><![CDATA[Tecciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Tecciencia]]></abbrev-journal-title>
<issn>1909-3667</issn>
<publisher>
<publisher-name><![CDATA[Universidad ECCI]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1909-36672018000200001</article-id>
<article-id pub-id-type="doi">10.18180/tecciencia.2018.25.1</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Cyanide Degradation from Mining Effluent Using Two Reagents: Sodium Metabisulphite and the Metabisulphite Mixture with Hydrogen Peroxide]]></article-title>
<article-title xml:lang="es"><![CDATA[Degradación del Cianuro de Efluente Minero Usando Dos Reactivos: Metabilsulfito de Sodio y la Mezcla Metabisulfito con Peróxido de Hidrógeno]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arangurí-Llerena]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-López]]></surname>
<given-names><![CDATA[Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Trujillo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>13</volume>
<numero>25</numero>
<fpage>1</fpage>
<lpage>9</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1909-36672018000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1909-36672018000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1909-36672018000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[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 (ANPVA), 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 Na2S2P5 was added with 4 hours of stirring.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El ion cianuro (CN-) es ampliamente usado en diferentes operaciones industriales, como la joyería, fabricación del acero extracción de oro y plata y galvanoplastia. Sin embargo las emisiones industriales, que contienen el ion CN- tienen que ser tratadas para cumplir con las regulaciones ambientales. Esta investigación tuvo como objetivo degradar el cianuro libre (CNL) presentes en el relave, de una planta metalúrgica que procesa minerales auríferos y utiliza el cianuro de sodio (NaCN) como reactivo lixiviante. Se usó metabisulfito de sodio (Na2S2O5) y metabisulfito de sodio con peróxido de hidrógeno (Na2S2O5 + H2O2) como agentes oxidantes. Para evaluar el efecto de los factores, se utilizó un diseño factorial con tres variables independientes: tiempo de agitación, porcentaje en exceso de reactivo, tipo de reactivo y una variable dependiente: degradación del CNL (mg/L). De acuerdo al análisis de varianza (ANPVA), las variables influyeron significativamente en la degradación del CNL, siendo el más relevante el porcentaje de exceso de reactivo y de acuerdo a los resultados el máximo de degradación de CNL fue 97.67% cuando se adiciona 400% de exceso de Na2S2O5 con 4 horas de agitación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyanide degradation]]></kwd>
<kwd lng="en"><![CDATA[Stoichiometric Excess]]></kwd>
<kwd lng="en"><![CDATA[Cyanide Ion]]></kwd>
<kwd lng="en"><![CDATA[Sodium Metabisulfite]]></kwd>
<kwd lng="en"><![CDATA[Hydrogen Peroxide]]></kwd>
<kwd lng="en"><![CDATA[Effluent Treatment]]></kwd>
<kwd lng="es"><![CDATA[Degradación del Cianuro]]></kwd>
<kwd lng="es"><![CDATA[Exceso Estequiométrico]]></kwd>
<kwd lng="es"><![CDATA[Ion Cianuro]]></kwd>
<kwd lng="es"><![CDATA[Metabisulfito de Sodio]]></kwd>
<kwd lng="es"><![CDATA[Peróxido de Hidrógeno]]></kwd>
<kwd lng="es"><![CDATA[Tratamiento de Efluentes]]></kwd>
</kwd-group>
</article-meta>
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