Browsing by Autor "Sergio Miranda Casanova"

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El azufre como material de construcción: Revisión del problema
(1986) Adriana Inés Grassi de De Barcia; Sergio Miranda Casanova
As the extraction of heavy crudes from Orinoco's Bituminous Belt advances, the national production of sulphur will continue to increase. The sulphur surplus will not be absorbed by the chemical industry nor will have place in the international markets. It is imperative to seek for new applications. Eventhoug pure sulphur's binding power is unstable, research studies have been undertaken in order to evaluate its potential as a construction material. The mechanical properties of sulphur are closely related to its allotropic forms and can be improved by using additives which stabilize monoclinic sulphur, unstable at ordinary temperatures, This paper discusses the properties of pure sulphur, the influence of additives, the properties of mortars made of sulphur-additives-filling materials, corrosion resistance, potential uses of these materials. It is of common interest not only to produce materials which can cope with the traditional ones, but also to develop materials highly resistant to acid salt corrosion to replace portland cement concrete.
Flotación del mineral de oro de El Callao
(1986) Sergio Miranda Casanova; Guillermo Suárez; J Aldo Osorio
Se hacen ensayos de flotacion con muestras de Mineral de Oro de El Callao, Estado Bolivar, Venezuela. El analisis de una muestra tipo indica: Au 12.2 gr/ton., Fe 9.3%, Zn 0.02%, S 2.8%, SiO2 68.3%. Se emplean etil e isobutil xantatos de sodio sintetizados en el Laboratorio y suministrados por AM. CYANAMID Co. El etil xantato es mas efectivo que el isobutil en la flotacion de los sulfuros. Con exceso de etil xantato se flota la totalidad de los sulfuros, lograndose colas con un contenido de oro del orden de 0.5 gr/ton. Aproximadamente un tercio de hierro y un tercio del cinc se encuentran asociados al azufre y los dos tercios restantes a la forma oxidada. La flotacion previa a la cianuracion se presenta como un camino promisorio para obtener altas recuperaciones de oro.
Fosfatos de Lizardo, Edo. Falcón: Parte II: Fosfatos de aluminio. Estudios de solubilización y obtención de H3PO4
(1987) G Julián Suárez; Sergio Miranda Casanova; M Amilcar Díaz; Teodolinda Moreno
Lizardo`s ores have been considered to replace Riecito`s ones as a source of phosphorites for fertilizer industry. A big interest for the Degree Thesis resumed in the present work (1)(2), so as for the preview (3) has been produced In this article are presented and discussed the pure aluminium phosphates solubilities studies with and with-out previews thermal treatment. Also is done on the simples superphosphates obtained with sulfuric acid attack Finally the results of the H3PO4 humid recovery process and his purification are given.
Purificación de lixiviados de cinc altamente contaminados
(1990) G Julián Suárez; Sergio Miranda Casanova; R. Uzcátegui
The zinc differential extraction and reextraction from with iron, highly contaminated leaching solutions has been studied. In Chlorure media, Zn as Fe build anionic complexes suitables to extraction using anionic liquid exchangers solved in Kerosene. Amberlite LA2 (Rohm & Haas) has been used determining the values of the physicochemical parameters that define the oPtima for Extraction and Reextraction processes.
Recuperación de TiO2 de Ilmenitas del Bajo Caroní
(1986) G Julián Suárez; Sergio Miranda Casanova
The gold`s recovery wasted sands from Rio Claro Low Caroni were size classified and Chemically analized. The fine fraction (-50 mesh) of the black sands was used in this work, it represents 20.23% and contains 53,12% of Ti02. The digestion process was studied; it was determined the influence of temperature, reaction time, weight ratios ore to concentrated sulphuric acid. The kinetic and yields of the Leaching process are discussed. It is possible to recovery 93% TiO2.