scholarly journals Blanqueo de caolín por medio de lixiviación en pilas con ácido oxálico

Respuestas ◽  
2016 ◽  
Vol 21 (1) ◽  
pp. 65 ◽  
Author(s):  
Manuel Julián Barros-Daza ◽  
Pablo Bustamante-Baena ◽  
Moisés Oswaldo Bustamante-Rúa
Keyword(s):  
Scale Development ◽  
Oxalic Acid ◽  
Iron Oxides ◽  
Iron Content ◽  
Experimental Results ◽  
Whiteness Index ◽  
Palabras Clave

Se estudiaron los resultados experimentales de lixiviación en pilas para el blanqueo del caolín a escala de laboratorio basados en un desarrollo teórico. El objetivo principal fue evaluar la remoción de óxidos de hierro sobre la superficie del caolín, Método con el uso de diferentes concentraciones de ácido oxálico en un tiempo de 48 días. Resultado. El índice de blancura del caolín de alimento fue del 52.1%, con porcentajes de hierro del 0.19%. A partir de los ensayos experimentales, Conclusión los resultados mostraron que para las concentraciones de 0.15M, 0.015M y 0.95M, las remociones de hierro fueron alrededor del 72.2%, 26.7%, 90.8% y los índices de blancura obtenidos fueron de 90.2%, 83.8% y 97% respectivamente.Abstract The experimental results of leaching were studied in batteries for bleaching kaolin scale The experimental results of leaching were studied in batteries for bleaching kaolin scale development based on a theoretical laboratory. The main objective was to evaluate the removal of iron oxides on the surface of kaolin, Methods: the use of different concentrations of oxalic acid drip for 48 days in each heap. Results: The whiteness index of feed Kaolin is 52.1%, with an iron content of 0.19%. Conclusions: The results showed that for acidic concentrations 0.15M, 0.015M and 0.95M, the iron removed was approximately 72.2%, 26.7%, 90.8% and the whiteness index rose to 90.23%, 83.8%, and 97% respectively. Palabras clave: Acido Oxálico, Blanqueo de Caolín, Hidrometalurgia, Lixiviación en pilas, Óxidos de hierro

scholarly journals Arsenic mobilization from iron oxides in the presence of oxalic acid under hydrodynamic conditions

Chemosphere ◽  
2018 ◽  
Vol 212 ◽  
pp. 219-227 ◽  
Author(s):  
Jing Sun ◽  
Benjamin C. Bostick ◽  
Brian J. Mailloux ◽  
James Jamieson ◽  
Beizhan Yan ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Iron Oxides ◽  
Hydrodynamic Conditions ◽  
Arsenic Mobilization

scholarly journals Investigation on the garnierite and limonite mixed laterite ore for recovery nickel

2021 ◽  
pp. 20-20
Author(s):  
S.-W. Zhou ◽  
C. Lu ◽  
B. Zhang ◽  
B. Li ◽  
Y.-G. Wei
Keyword(s):  
Phase Transformation ◽  
Iron Oxides ◽  
Iron Content ◽  
Recovery Rate ◽  
Heating Process ◽  
Silicate Minerals ◽  
Amorphous Silicate ◽  
Development And Utilization ◽  
Iron Bearing ◽  
Laterite Ore

Laterite, as an important resource of nickel, has become the focus of development and utilization. This study adopted the method of mixing ore (garnierite and limonite) to increase the recovery rate of nickel in garnierite ore. The phase transformation of the two ores were investigated during the heating process, dehydroxylation and recrystallization were observed and the iron oxides phase was transformed into iron-containing spinel finally. By changing the proportion of the two ores, increasing the iron content in the sample was beneficial to the reduction of nickel. Then, Fe2O3, Fe3O4 and Fe were used as the iron source to study the mechanism of the iron-bearing minerals in promoting the reduction of nickel. The results indicated that hematite and/or magnetite would react with amorphous silicate minerals to generate magnesioferrite and enstatite, thereby avoiding additional forsterite generation; moreover, the trevorite phase would be formed, which strengthens the aggregation of nickel and iron.

Occurrence of talc in soils with high iron content from the south-west of Spain

Soil Research ◽  
1996 ◽  
Vol 34 (5) ◽  
pp. 635 ◽  
Author(s):  
JL Perez-Rodriguez ◽  
C Maqueda ◽  
P Rodriguezrubio ◽  
MCJ Deharo
Keyword(s):  
Iron Oxides ◽  
Iron Content ◽  
Clay Fraction ◽  
Parent Material ◽  
High Iron Content ◽  
High Iron ◽  
Notable Feature ◽  
Iron Mineral ◽  
Residual Phase ◽  
South West

The mineralogy of the clay fractions of 2 soil profiles classified as an Alfic Dystric Eutrochrept (Soil I) and a Xerochreptic Haploxeralf (Soil II) has been determined. A notable feature of these soils is the presence of talc and the high iron content as goethite, hematite, lepidocrocite, and maghemite. Talc was the most abundant non-iron mineral of the clay fraction of Soil II. In Soil I, talc occurs as a residual phase from the parent material with its persistence in the profile aided by coatings of iron oxides, which inhibit further weathering. In these soils there is a high proportion of goethite accompanied by hematite. In Soil I the proportion of iron oxides changes within the profile. Another notable feature of this profile is the presence of maghemite in the upper horizons where this is the predominant iron oxide mineral.

scholarly journals HISTÓRIA E MEMÓRIA DE UM MUNICÍPIO DA AMAZÔNIA a chegada do “progresso” em Moju/ PA (Década de 1980)

2016 ◽  
Vol 2 (2) ◽  
pp. 113
Author(s):  
Fabiano De Oliveira Bringel ◽  
Elias Diniz Sacramento
Keyword(s):  
Scale Development ◽  
Large Scale ◽  
Brazilian Amazon ◽  
The State ◽  
Development Projects ◽  
Palabras Clave ◽  
Japanese Immigration ◽  
The City

Este artigo tem por finalidade mostrar algumas transformações ocorridas em Moju, um município da Amazônia no inicio da década de 1980, quando a região foi ‘tomada’ pela chegada de diversos projetos agroindustriais pautados nos ideais desenvolvimentistas dos militares. Tais mudanças foram de grandes impactos para os moradores do município, onde ainda hoje tem em suas memórias esse difícil período da história. As diversas conectividades que o município começa a ter com expansão capitalista são destacadas como: a imigração japonesa, a opção rodoviarista, a instalação dos grandes projetos e a presença seletiva do Estado. Isso tudo discutido a partir da fala de lideranças camponesas na região. Palavras chaves: Moju, Amazônia, Projetos agroindustriais, desenvolvimento, conflitos. Abstract:This article aims to show some of the changes that occurred in Moju, a municipality in the Brazilian Amazon, during the early 1980s, when the region was 'taken over' by the arrival of several agroindustrial projects guided by the ideals of the developmentalist military. Such changes were of great impact for the residents of the city, who still remember this difficult period of history.  Among the most prominent changes the municipality began to experience with the capitalist expansion were Japanese immigration, the option of overland travel, the initiation of large-scale development projects, and the selective presence of the state.  This article discusses these changes from the perspective of the region’s rural peasant leadership. Keywords: Moju, Amazon, agroindustrial projects, development, conflict  ResumenEste artículo tiene como objetivo mostrar algunos cambios que ocurrieron en Moju, un pueblo de la Amazonía en la década de 1980, cuando la región fue 'tomada' por la llegada de varios proyectos agroindustriales guiadas por los ideales de los militares desarrollista. Estos cambios fueron de gran impacto para los residentes de la ciudad, que todavía tiene en sus memorias este difícil período de la historia . Las diversas conectividades que la ciudad comienza a tener con la expansión capitalista se destacan como la inmigración japonesa, la opción rodoviarista, la instalación de grandes proyectos y la presencia selectiva del estado. Todo esto se discute desde el discurso de los líderes campesinos de la región. Palabras clave: Moju, Amazon, proyectos agroindustriales, desarrollo, conflictos.

Electrodialysis of oxalic acid: batch process modeling

2012 ◽  
Vol 66 (12) ◽  
Author(s):  
Jiří Kaláb ◽  
Zdeněk Palatý
Keyword(s):  
Mathematical Model ◽  
Czech Republic ◽  
Ion Exchange ◽  
Oxalic Acid ◽  
Aqueous Solutions ◽  
Process Modeling ◽  
Batch Process ◽  
Experimental Results ◽  
Current Densities ◽  
Good Agreement

AbstractBatch electrodialysis of aqueous solutions of oxalic acid was investigated using a laboratory electrodialyzer ED-Z mini equipped with ion-exchange membranes Ralex-AMH-PES and Ralex-CMHPES (Mega, Stráž pod Ralskem, Czech Republic). The paper presents a mathematical model which enables to predict changes in the oxalic acid concentrations in the diluate and concentrate compartments during the electrodialysis process under various conditions specified by combinations of the initial acid concentrations with current densities. The calculation proved a good agreement between the developed model and the experimental results.

PREPARATION AND ELECTRO-THERMOCONDUCTIVE CHARACTERISTICS OF MAGNETORHEOLOGICAL SUSPENSIONS

2008 ◽  
Vol 22 (29) ◽  
pp. 5041-5064 ◽  
Author(s):  
IOAN BICA ◽  
HYOUNG JIN CHOI
Keyword(s):  
Iron Oxides ◽  
Magnetic Particles ◽  
Experimental Results ◽  
Magnetorheological Suspensions ◽  
Iron Iron ◽  
Mr Characteristics

We review both synthesis and magnetorheological (MR) characteristics of magnetic particles concerning electro-thermoconductive MR suspensions. Various MR systems from nanoparticles to microparticles of iron, iron oxides and metallic solids with and without additives or modifications with polymers are summarized. Methods for electro-thermoconductive MR suspensions and mechanisms that lend them these properties, experimental results and discussions on them are presented.

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