<?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>0124-2253</journal-id>
<journal-title><![CDATA[Revista científica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Cient.]]></abbrev-journal-title>
<issn>0124-2253</issn>
<publisher>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-22532023000200116</article-id>
<article-id pub-id-type="doi">10.14483/23448350.20875</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de pretratamiento acuoso para mejorar la recuperación de Au, Ag y Pt a partir de catalizadores automotrices gastados]]></article-title>
<article-title xml:lang="en"><![CDATA[Aqueous Pretreatment Effect to Improve Au, Ag, and Pt Recovery from Spent Automotive Catalysts]]></article-title>
<article-title xml:lang="en"><![CDATA[Efeito do pré-tratamento aquoso para melhorar a recuperação de Au, Ag e Pt de catalisadores automotivos usados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Borda]]></surname>
<given-names><![CDATA[Johana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[Robinson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia  ]]></institution>
<addr-line><![CDATA[Boyacá Tunja]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia  ]]></institution>
<addr-line><![CDATA[Boyacá Tunja]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia  ]]></institution>
<addr-line><![CDATA[Boyacá Tunja]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<numero>47</numero>
<fpage>116</fpage>
<lpage>126</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-22532023000200116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-22532023000200116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-22532023000200116&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los catalizadores automotrices representan una fuente secundaria de recuperación de metales preciosos. Usualmente estos elementos son obtenidos de minerales. Recientemente se han buscado métodos para recuperarlos a partir de materiales de desecho. La principal ruta consiste en tratamientos pirometalúrgicos a elevadas temperaturas con la generación de otros contaminantes y un elevadísimo consumo energético. Con la hidrometalurgia, se pueden desarrollar rutas que favorezcan la extracción acuosa de dichos elementos a temperatura ambiente. En un catalizador automotriz, hay distintos metales que pueden interferir en el proceso de recuperación. Este estudio evaluó citrato de sodio (Na3C6H5O7&#8226;H2O), ácido nítrico (HNO3) y ácido clorhídrico (HCl) como pretratamiento hidrometalúrgico para disolver Fe, Zn y Pb contenidos en un catalizador automotriz gastado y mejorar la extracción posterior de los metales preciosos contenidos en el mismo (Au, Ag y Pt). Posteriormente, se realizó la extracción acuosa de elementos preciosos con tiourea (SC(NH2)2), comparando el efecto de los reactivos de pretratamiento. Finalmente, se analizaron la viabilidad y el efecto de cada pretratamiento como ruta en la recuperación de metales preciosos, a fin de evitar procesos a altas temperaturas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Automotive catalysts represent a secondary source for precious metals recovery. These elements are usually obtained from minerals. Recently, methods have been sought to recover them from waste materials. The main route consists of pyrometallurgical treatments at high temperatures with the generation of other pollutants and very high energy consumption. With hydrometallurgy, routes can be developed which favor the aqueous extraction of said elements at room temperature. In an automotive catalyst, there are different metals which can interfere in the recovery process. In this study, sodium citrate (Na3C6H5O7&#8226;H2O), nitric acid (HNO3), and hydrochloric acid (HCl) were evaluated as a hydrometallurgical pretreatment to dissolve Fe, Zn, and Pb contained in a spent automotive catalyst and to improve the subsequent extraction of the precious metals contained therein (Au, Ag, and Pt). Afterwards, the aqueous extraction of precious elements with thiourea (SC(NH2)2) was carried out, comparing the effect of the pretreatment reagents. Finally, the feasibility and effect of each pretreatment as a route for precious metals recovery were analyzed with the aim to avoid processes at high temperatures.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Catalisadores automotivos representam uma fonte secundária de recuperação de metais preciosos. Normalmente, esses elementos são obtidos a partir de minerais. Recentemente, têm-se procurado métodos para recuperá-los a partir de materiais residuais. A rota principal consiste em tratamentos pirometalúrgicos em altas temperaturas com geração de outros poluentes e consumo de energia muito alto. Com hidrometalurgia podem ser desenvolvidas rotas que favorecem a extração aquosa dos referidos elementos à temperatura ambiente. Em um catalisador automotivo existem diversos metais que podem interferir no processo de recuperação. Neste estudo, citrato de sódio (Na3C6H5O7&#8226;H2O), ácido nítrico (HNO3) e ácido clorídrico (HCl) foram avaliados respectivamente como pré-tratamento hidrometalúrgico para a dissolução de Fe, Zn e Pb contidos em um catalisador automotivo usado e para melhorar a extração posterior dos metais preciosos nele contidos (Au, Ag e PT). Posteriormente, foi realizada a extração aquosa de elementos preciosos com tioureia (SC(NH2)2), comparando o efeito do reagente de pré-tratamento. Por fim, analisou-se a viabilidade e o efeito de cada pré-tratamento como rota na recuperação de metais preciosos, a fim de evitar processos em altas temperaturas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[catalizadores automotrices de desecho]]></kwd>
<kwd lng="es"><![CDATA[lixiviación]]></kwd>
<kwd lng="es"><![CDATA[metales preciosos.]]></kwd>
<kwd lng="en"><![CDATA[leaching]]></kwd>
<kwd lng="en"><![CDATA[precious metals]]></kwd>
<kwd lng="en"><![CDATA[spent automotive catalysts.]]></kwd>
<kwd lng="pt"><![CDATA[lixiviação]]></kwd>
<kwd lng="pt"><![CDATA[metais preciosos]]></kwd>
<kwd lng="pt"><![CDATA[resíduos de catalisadores automotivos.]]></kwd>
</kwd-group>
</article-meta>
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