scholarly journals Concentration of bauxite fines via froth flotation

2009 ◽  
Vol 62 (3) ◽  
pp. 271-276 ◽  
Author(s):  
Renata Salles Kurusu ◽  
Arthur Pinto Chaves ◽  
Christian Fonseca de Andrade ◽  
Claret Antônio Vidal Abreu
Keyword(s):  
Magnetic Separation ◽  
Froth Flotation ◽  
Minas Gerais ◽  
The State ◽  
Gravity Separation ◽  
Processing Plant ◽  
Bench Scale ◽  
Processing Plants ◽  
Poços De Caldas ◽  
New Processing

Companhia Brasileira de Alumínio (CBA) has bauxite processing plants at Poços de Caldas and Itamarati de Minas, and a new processing plant at Miraí that has been operating since June, 2008; all of them are in the State of Minas Gerais. The plants haveunits for the crushing, scrubbing and screening operations. The screened oversize is the concentrate or washed bauxite. At Itamarati de Minas, the fines are de-slimed and concentrated by gravity separation of the iron-titanium minerals in Reichert spirals followed by HIWMS. The tailings still contain bauxite, which can be separated by reverse froth flotation (flotation of the quartz and depression of the bauxite), using starch as a depressant and amine as a promoter; the pH must be around 10.0. The iron and titanium bearing minerals are depressed with the bauxite and an additional magnetic separation operation is necessary on the depressed bauxite. This paper describes the work performed on Itamarati de Minas samples on a bench scale at Escola Politécnica, University of S. Paulo.

scholarly journals Beneficiation of Talc-Magnesite Ore with Cu-Co Mineralization

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Ivan BREZÁNI ◽  
Martin SISOL ◽  
Michal MARCIN ◽  
Maroš SÝKORA ◽  
Michal MAŤAŠOVSKÝ ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Froth Flotation ◽  
Gravity Separation ◽  
Shaking Table ◽  
Raw Material ◽  
Electrostatic Separation ◽  
Accessory Minerals ◽  
Size Fractions ◽  
Preliminary Results ◽  
Flotation Cell

Magnesite ore with a low chalcopyrite – cobaltite mineralization was subjected to a series of separations designed to evaluate thepossible concentration of the two accessory minerals. Although the Cu-Co grade in the ore (> 0.01% Co, > 0.1% Cu) is significantlylower than the typical economic grades, content of the main valuable mineral for which the ore is mined and processed incombination with a listing of cobalt as a critical raw material, coupled with their higher price might compensate for the additionalbeneficiation stages. The ore was first crushed and subsequently classified to -100 μm and +100 -400 μm size fractions. The finefraction was upgraded by froth flotation processing in laboratory froth flotation cell. The coarser fraction was processed in severalseparation stages including gravity separation on shaking table, magnetic separation and corona electrostatic separation. The sameprocedure was also repeated with a higher-grade sample as a verification of the procedures. Preliminary results suggest that theaccessory minerals can be separated from the talc-magnesite ore and individual mineral concentrates with about 19% Co and 28%Cu were prepared. However, further work must be done to achieve desirable recoveries for the processing to be economically viable.

Studies of the Mobilization of Thoriun from the Norro Do Ferro

1981 ◽  
Vol 11 ◽  
Author(s):  
H. Eiseneud ◽  
W. Lei ◽  
R. Ballad ◽  
E. Penna Franca ◽  
N. Niekeley ◽  
...  
Keyword(s):  
Rare Earths ◽  
Natural Radioactivity ◽  
Minas Gerais ◽  
The State ◽  
The Past ◽  
Ore Body ◽  
The Earth ◽  
Poços De Caldas ◽  
The Hill

The Morro do Ferro1,2,3 is a hill on the Pocos de Caldas plateau in the state of of Minas Gerais, Brazil which, except for a few monazite beaches, may have the highest levels of natural radioactivity of any place on the surface of the earth (1–3 mK/hr). The radioactivity originates from an ore body located on the upper slopes of the hill (Fig. 1), which rises about 140 m above its surroundings to a maximum altitude of 1540 m. The ore body is estimated to contain about 20,000 metric tons of Th and a somewhat greater quantity of rare earths. The Morro do Ferro has been the site of a number of radiobiological studies conducted during the past 20 years.4,5,6,7

scholarly journals Retail Survey of Brazilian Milk and Minas Frescal Cheese and a Contaminated Dairy Plant To Establish Prevalence, Relatedness, and Sources of Listeria monocytogenes Isolates

2008 ◽  
Vol 74 (15) ◽  
pp. 4954-4961 ◽  
Author(s):  
J. Renaldi F. Brito ◽  
Emilia M. P. Santos ◽  
Edna F. Arcuri ◽  
Carla C. Lange ◽  
Maria A. V. P. Brito ◽  
...  
Keyword(s):  
Listeria Monocytogenes ◽  
Environmental Samples ◽  
Minas Gerais ◽  
Processing Plant ◽  
Contamination Source ◽  
Milk Samples ◽  
Dairy Processing ◽  
Processing Plants ◽  
Serotype 1 ◽  
Dairy Plant

ABSTRACT A study was designed to recover Listeria monocytogenes from pasteurized milk and Minas frescal cheese (MFC) sampled at retail establishments (REs) and to identify the contamination source(s) of these products in the corresponding dairy processing plant. Fifty milk samples (9 brands) and 55 MFC samples (10 brands) were tested from REs located in Juiz de Fora, Minas Gerais, Brazil. All milk samples and 45 samples from 9 of 10 MFC brands tested negative for L. monocytogenes; however, “brand F” of MFC obtained from REs 119 and 159 tested positive. Thus, the farm/plant that produced brand F MFC was sampled; all samples from the milking parlor tested negative for L. monocytogenes, whereas several sites within the processing plant and the MFC samples tested positive. All 344 isolates recovered from retail MFC, plant F MFC, and plant F environmental samples were serotype 1/2a and displayed the same AscI or ApaI fingerprints. Since these results established that the storage coolers served as the contamination source of the MFC, plant F was closed so that corrective renovations could be made. Following renovation, samples from sites that previously tested positive for the pathogen were collected from the processing environment and from MFC on multiple visits; all tested negative for L. monocytogenes. In addition, on subsequent visits to REs 159 and 119, all MFC samples tested negative for the pathogen. Studies are ongoing to quantify the prevalence, levels, and types of L. monocytogenes in MFC and associated processing plants to lessen the likelihood of listeriosis in Brazil.

Matéria orgânica e agregação do solo em áreas sobre influência da mineração de bauxita na região do planalto de Poços de Caldas, MG

2019 ◽  
Vol 14 (2) ◽  
pp. 160
Author(s):  
Dalmo Arantes De Barros ◽  
Marcondes Geraldo Coelho Junior ◽  
Athila Leandro De Oliveira ◽  
Eduardo Carvalho da Silva Neto
Keyword(s):  
Minas Gerais ◽  
Poços De Caldas

Estudos sobre mudanças nas propriedades do solo decorrentes das atividades de mineração são importantes para a compreensão e desenvolvimento de novas formas de manejo do solo e recuperação de áreas degradadas. Este trabalho visou determinar as possíveis alterações nos teores de matéria orgânica e nos índices de agregação do solo geradas pela mineração de bauxita em Poços de Caldas, Minas Gerais. Aplicou-se delineamento experimental com três blocos casualizados, dois tratamentos (antes da intervenção minerária e depois da recuperação ambiental) e quatro repetições. Foram determinados os teores de matéria orgânica e calculados os valores de diâmetro médio ponderado (DMP), o diâmetro médio geométrico (DMG), macro e microagregados a partir da porcentagem de solo retida em cada peneira no tamisamento dos agregados. Houve redução da estabilidade de agregados em água após a intervenção minerária, indicando que tais atividades geram impactos negativos sobre sua estrutura física. Os altos valores de DMP e DMG podem ser atribuídos ao material de origem dos solos da região. Não foram verificadas diferenças significativas para os teores de matéria orgânica nas camadas avaliadas antes da mineração e depois da recuperação, indicando que os processos de recuperação da área minerada propiciaram manutenção dos teores de matéria orgânica do solo.

Effect of incarceration on criminality in the state of Minas Gerais, Brazil

2021 ◽  
Author(s):  
Laís de Sousa Abreu Soares ◽  
Filipe Mendes Dalboni ◽  
Evandro Camargos Teixeira
Keyword(s):  
Minas Gerais ◽  
The State

scholarly journals Low frequency of LRV1 in Leishmania braziliensis strains isolated from typical and atypical lesions in the State of Minas Gerais, Brazil

2016 ◽  
Vol 210 (1-2) ◽  
pp. 50-54 ◽  
Author(s):  
Diego H. Macedo ◽  
Armando Menezes-Neto ◽  
Jeronimo M. Rugani ◽  
Ana C. Rocha ◽  
Soraia O. Silva ◽  
...  
Keyword(s):  
Low Frequency ◽  
Minas Gerais ◽  
The State ◽  
Leishmania Braziliensis

THE USE OF SOAPSTONE IN MASTERPIECES IN THE STATE OF MINAS GERAIS

1992 ◽  
Vol 37 (sup2) ◽  
pp. 13-13
Author(s):  
Alexandre Soares Leal ◽  
Allan Sostenis Hanke
Keyword(s):  
Minas Gerais ◽  
The State

scholarly journals High sero-prevalence of caseous lymphadenitis identified in slaughterhouse samples as a consequence of deficiencies in sheep farm management in the state of Minas Gerais, Brazil

2011 ◽  
Vol 7 (1) ◽  
pp. 68 ◽  
Author(s):  
Alessandro S Guimarães ◽  
Filipe B Carmo ◽  
Marcos B Heinemann ◽  
Ricardo WD Portela ◽  
Roberto Meyer ◽  
...  
Keyword(s):  
Minas Gerais ◽  
Farm Management ◽  
The State ◽  
Caseous Lymphadenitis ◽  
Sheep Farm

Diversity of flaA Genotypes among Campylobacter jejuni Isolated from Six Niche-Market Poultry Species at Farm and Processing

2006 ◽  
Vol 69 (2) ◽  
pp. 299-307 ◽  
Author(s):  
C. VanWORTH ◽  
B. A. McCREA ◽  
K. H. TONOOKA ◽  
C. L. BOGGS ◽  
J. S. SCHRADER
Keyword(s):  
Restriction Fragment Length Polymorphism ◽  
Campylobacter Jejuni ◽  
Length Polymorphism ◽  
Fragment Length Polymorphism ◽  
Guinea Fowl ◽  
Processing Plant ◽  
Cross Contamination ◽  
Free Range ◽  
Processing Plants ◽  
Restriction Fragment Length

PCR–restriction fragment length polymorphism of the flagellin (flaA) gene in Campylobacter jejuni was used to determine the relationships of isolates collected at the farm and throughout processing for six niche-market poultry species. This study focused on two specialty chicken products, poussin and free range, and four other specialty products, squab, duck, guinea fowl, and quail. Cloacal and carcass samples were collected from three flocks from each of the six niche species. Three processing plants in California participated in a 2-year investigation. A total of 773 isolates from farm, posttransport, and the processing plants were genotyped, yielding a total of 72 distinct flaA profiles for the six commodities. Genetic diversity of C. jejuni at the farm was greatest for ducks with up to 12 distinct flaA types in two flocks and least for squab 1 flaA type between two farms. For two of the guinea fowl flocks, one free-range flock, two squab flocks, and all three poussin flocks, the flaA types recovered at the prepackage station matched those from the farm. Cross-contamination of poultry carcasses was supported by the observation of flaA types during processing that were not present at the farm level. New C. jejuni strains were detected after transport in ducks, guinea fowl, and free-range chickens. Postpicker, postevisceration, and prewash sampling points in the processing plant yield novel isolates. Duck and free-range chickens were the only species for which strains recovered within the processing plant were also found on the final product. Isolates recovered from squab had 56 to 93% similarity based on the flaA types defined by PCR–restriction fragment length polymorphism profiles. The 26 duck isolates had genetic similarities that ranged from 20 to 90%. Guinea fowl and free-range chickens each had 40 to 65% similarity between isolates. Poussin isolates were 33 to 55% similar to each other, and quail isolates were 46 to 100% similar. Our results continue to emphasize the need to clean processing equipment and posttransport crates in order to decrease cross contamination between flocks. This study also determined that several strains of C. jejuni had unique flaA types that could only be recovered in their host species.

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