<?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>2221-2450</journal-id>
<journal-title><![CDATA[Revista CENIC Ciencias Biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. CENIC Cienc. Biol]]></abbrev-journal-title>
<issn>2221-2450</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Investigaciones Científicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2221-24502022000200197</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Solubilización de níquel y cobalto presente en un escombro laterítico mediante el empleo de Acidithiobacillus thiooxidans]]></article-title>
<article-title xml:lang="en"><![CDATA[Solubilization of nickel and cobalt in lateritic overburden by Acidithiobacillus thiooxidans]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leal Sanabria]]></surname>
<given-names><![CDATA[Güendis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez López]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Pérez]]></surname>
<given-names><![CDATA[Maria Caridad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pons Herrera]]></surname>
<given-names><![CDATA[José Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de La Habana  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<fpage>197</fpage>
<lpage>206</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2221-24502022000200197&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2221-24502022000200197&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2221-24502022000200197&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El tratamiento de minerales de baja ley y de residuales sólidos mineros constituye un desafío para la comunidad científica, teniendo en cuenta el impacto negativo que tiene la acumulación de los mismos en los ecosistemas. En este sentido el empleo de microorganismos para la extracción de metales a partir de minerales oxidados ha ganado gran atención en los últimos años al constituir una estrategia más eficiente, económica y amigable con el medio ambiente. El siguiente trabajo tuvo como objetivo evaluar la solubilización de níquel y cobalto contenidos en escombros lateríticos mediante el empleo Acidithiobacillus thiooxidans. Se utilizó la cepa A. thiooxidans DSM 14887 y el escombro laterítico procedente del yacimiento laterítico de Moa (escombro de Camarioca norte Zona 12). Se evaluó la solubilización de Ni (II) y Co (II) en sistemas con diferentes concentraciones del mineral (5%, 10% y 20% p/v). Además, se evaluó el bioácido producido por la bacteria, como agente lixiviante en la recuperación de níquel y cobalto. En presencia de 5% (p/v) de densidad de pulpa del mineral se lograron los mayores porcentajes solubilización (71,4% de Co y 48,5% de Ni). En los cultivos se detectó un aumento en la concentración de Fe (II), indicativo de la solubilización reductiva del Fe (III) contenido en el mineral. Los porcentajes de extracción del cobalto y níquel disminuyeron al utilizar el bioácido bacteriano, lo que resalta la importancia de la bacteria en el proceso extractivo. El empleo de la cepa A. thiooxidans en la recuperación de metales constituye una alternativa promisoria para el tratamiento de los minerales oxidados de baja ley.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The treatment of low-grade minerals and solid mining waste constitutes a challenge for the scientific community, because of the negative impact that their accumulation has on ecosystems. The use of microorganisms for the extraction of metals from oxidized minerals has gained great attention in recent years as it constitutes a more efficient, economical and environmentally friendly strategy. The aim of this research was to evaluate the solubilization of nickel and cobalt contained in lateritic overburden using Acidithiobacillus thiooxidans. The strain A. thiooxidans DSM 14887 and the lateritic overburden from the lateritic deposit of Moa (overbourden of Camarioca north Zone 12) were used. The solubilization of Ni (II) and Co (II) was evaluated in systems with different concentrations of the mineral (5%, 10% and 20% w/v). In addition, was evaluated the bioacid produced by the bacteria as a leaching agent in the recovery of nickel and cobalt. The highest solubilization percentages were achieved (71.4% Co and 48.5% Ni) by using 5% (w/v) of mineral pulp density. An increase in Fe (II) concentration was detected in the cultures, it indicative of the reductive solubilization of Fe (III) contained in the mineral. The extraction percentages of cobalt and nickel decreased when using the bacterial bioacid. The use of the A. thiooxidans strain in the recovery of metals constitutes a promising alternative for the treatment of low-grade oxidized minerals.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[biolixiviación]]></kwd>
<kwd lng="es"><![CDATA[minerales oxidados]]></kwd>
<kwd lng="es"><![CDATA[densidad de pulpa]]></kwd>
<kwd lng="es"><![CDATA[bioácido]]></kwd>
<kwd lng="en"><![CDATA[bioleaching]]></kwd>
<kwd lng="en"><![CDATA[oxides ores]]></kwd>
<kwd lng="en"><![CDATA[pulp density]]></kwd>
<kwd lng="en"><![CDATA[bioacid]]></kwd>
</kwd-group>
</article-meta>
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