<?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>1993-8012</journal-id>
<journal-title><![CDATA[Minería y Geología]]></journal-title>
<abbrev-journal-title><![CDATA[Min. Geol.]]></abbrev-journal-title>
<issn>1993-8012</issn>
<publisher>
<publisher-name><![CDATA[EDUM. Universidad de Moa]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1993-80122020000400451</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia de la velocidad de giro del molino en los indicadores de la molienda autógena de las menas kimberlíticas de Catoca, Angola]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of mill rotation speed on indicators of autogenous grinding of kimberlitic ores of Catoca, Angola]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martins-Pole]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Coello-Velázquez]]></surname>
<given-names><![CDATA[Alfredo Lázaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Menéndez-Aguado]]></surname>
<given-names><![CDATA[Juan María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sierra-Fernández]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sociedad Minera de Catoca  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Angola</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Moa  ]]></institution>
<addr-line><![CDATA[ Holguín]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Oviedo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de León  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>36</volume>
<numero>4</numero>
<fpage>451</fpage>
<lpage>464</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1993-80122020000400451&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1993-80122020000400451&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1993-80122020000400451&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La producción de diamantes tiene gran impacto en la economía de la República de Angola, en la que tiene especial relevancia la planta de Catoca, en la cual la molienda autógena juega un papel relevante en la tecnología del procesamiento de las menas kimberlíticas, pues tiene la finalidad de conseguir la liberación a tamaños lo más gruesos posible. Con el objetivo de evaluar la influencia de la velocidad de giro y la densidad de la pulpa en los indicadores de eficiencia energética del molino, se diseñó una serie de ensayos considerando tres niveles de velocidad (55 %, 65 % y 80 % de la velocidad crítica) y dos niveles de dilución: pulpas diluidas (45 %-50 % de sólidos), y pulpas densas (55 %-60 % de sólido). Se organizó un sistema de muestreo en la instalación industrial que permitiera evaluar la distribución de tamaño de las partículas en la descarga del molino y se registraron la potencia consumida por su motor y su capacidad. Al mismo tiempo fue evaluada la energía específica consumida por el molino. Los resultados muestran que ambos factores operacionales influyen de manera decisiva en los indicadores estudiados. Mientras mayor es la densidad de la pulpa y la velocidad de giro del molino, mayor es el tamaño de la salida del molino. La velocidad de giro influye fuertemente en el consumo energético de la instalación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The diamonds production has a great impact on the economy of the Republic of Angola, in which Catoca plant is of particular relevance. The autogenous grinding plays an important role in the technology of processing kimberlitic ores, as it has the purpose of achieving the release at the coarsest possible sizes. In order to evaluate the influence of the rotation speed and the pulp density on the energy efficiency indicators of the mill, a series of tests was designed considering three speed levels (55, 65 and 80 % of the critical speed) and two levels of dilution (dilute pulps, 45-50 % solids, and dense pulps 55-60 % solid). A sampling system was organized in the industrial facility that allowed evaluating the size distribution of the particles in the mill discharge and the power consumed by its motor and its capacity were recorded. At the same time, the specific energy consumed by the mill was evaluated. The results show that both operational factors have a decisive influence on the indicators studied. The higher the density of the pulp and the rotational speed of the mill, the larger the size of the mill outlet. The speed of rotation strongly influences the energy consumption of the installation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[indicadores energo-tecnológicos]]></kwd>
<kwd lng="es"><![CDATA[molienda autógena]]></kwd>
<kwd lng="es"><![CDATA[régimen de densidad de pulpa]]></kwd>
<kwd lng="es"><![CDATA[velocidad de giro del molino]]></kwd>
<kwd lng="en"><![CDATA[energy-technological indicators]]></kwd>
<kwd lng="en"><![CDATA[autogenous grinding]]></kwd>
<kwd lng="en"><![CDATA[pulp density]]></kwd>
<kwd lng="en"><![CDATA[turning speed]]></kwd>
<kwd lng="en"><![CDATA[energy efficiency]]></kwd>
<kwd lng="en"><![CDATA[kimberlitic ores]]></kwd>
</kwd-group>
</article-meta>
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