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Vol. VI, Fasc. 1/4 (1950)

Vol. VI, Fasc. 1/4 (1950)


Vol. VI, Fasc. 1/4 (1950)Categoria: Publicações, Estudos, Notas e Trabalhos, 1950 a 1959

15.90

O preço inclui IVA à taxa legal em vigor.

Descrição

Artigos

1. Características dos Minérios do Jazigo de Ferro de Guadramil.
J. M. Cotelo Neiva ; Jorge Gouveia ( páginas)
Resumo: The siderite ore, presenting an oölitic texture, is constituted of oölites of siderite, silex and some of chamosite, cemented by siderite and calcite. It alters at the surface to limonite, stillpnosiderite, some goethite and chlorite. In the faulty zones it was metamorphosed to specularite. The carbonated ore averages in Fe, it ranging from phosphorous to average phosphorous.

2. Geologia do Jazigo de Ferro de Guadramil.
A. Cândido de Medeiros ( páginas)
Resumo: Dans ce travail l’auteur présente une étude géologique de la région du gisement de minerai de fer de Guadramil, situé dans la zone frontiére à l’extrême Nord-Est de la province de Trás-os-Montes. La présence de Lingula, Cruziana, Vexillum, Scolithus, etc. permet de placer les formations qui acompagnent le minerai, dans le Skiddavien (Silurien inférieur).Des formations analogues peuvent être observées en d’autres points du district de Bragança, le long de la frontière espagnole (ex: Avelanoso, Vale de Frades, Pinheiro Novo).

3. Identificação de uma Montmorilonite Portuguesa.
Tomás Lopez Castro ( páginas)
Resumo: By means of chemical analises, curve of dehydratation and change of bases, the argil of Gueral (Barcelos-Portugal) was studied and it was proved to be a montmorilonite slightly impure by colloidal silica, scarse grains of silica and colloidal iron oxide. Magnesium and iron, in combination, should be found specially as isomorphical substitutes of the aluminium, what would probably be the cause of the high capacity of change of bases.

4. Notícia Sobre o Valor Económico do Jazigo de Guadramil.
J. A. da Cunha Gouveia ; F. de Morais Ferreira ( páginas)
Resumo: In the iron deposit of Guadramil, in the extreme NE of Portugal, research works are not yet concluded but they have already revealed that it is a bed of sideritic mineral changed to limonite near the surface, this sideritic mineral being susceptible of great benefit by means of the operation of calcination at a reduced price.The proved reserves of limonit are calculated at about 1 million tons. Provisionally, the proved reserves of carbonated mineral are calculated at about 2,5 million tons and this amount will be, in the near future, largely increased, owing to the conclusion of the work.

5. O Processo Humboldt: Possibilidades do seu Emprego e sua Economia.
V. Pinto Pinheiro ; H. Lopes Vieira ( páginas)
Resumo: In few words, the process called «Low-Temperature distillation and fusion in slow shaft furnace», which Humboldt-Deutz Motoren has been developing through the last years, has its main purpose the obtainment of pig iron from some casting-beds in which the parts or at least some of them are not adequate for the classic Iron Blast Furnace. In particular it allows the use of non-coking coals and iron minerals of very fine granulation, either in the case of residues of other industries or substances needing to be enriched.All these materials are aglomerated in briquettes with which the burden is made up. The main characteristics of the furnace are the square of rectangular section and the short height of it, which does not exceed 4 meters; it has however a specific production higher than the average of the conventional blast furnace. It must also be noted that the quantity of throat gas produced per ton of pig iron, and its rate of carbon monoxide is higher too.
In the making of this work, the authors based themselves on the results of some previous experiments carried out on an experimental furnace at Cologne and particularly on a experiment in which has been used the portuguese Magnetite and Anthracite. They make too short comments of the available portuguese raw materials, and calculate three casting-beds of which we give below the main characteristics; the balance of materials and the termic balances of each one of the hypothesis are shown in order to find out the cost of the obtained products, beeing this purpose of this study.
(…) Resumo Parcial

6. Relatório do Serviço de Fomento Mineiro do Ano de 1950.
J. L. Guimarães dos Santos ( páginas)
Resumo: Na colecção dos Relatórios foram já dados à estampa elementos sobre a actividade e a administração do Serviço desde 1939 até 1946 e está em preparação um novo volume respeitante ao triénio 1947-1949. Também nos Estudos, Notas e Trabalhos se tem vindo a publicar resumos semestrais da actividade do Serviço desde 1945 até 1949. Igualmente se deram já a lume «Apontamentos sobre a actividade do Serviço de Fomento Mineiro até ao fim do ano de 1949». A par disto o Serviço vem elaborando anualmente relatórios da actividade e administração para serem submetidos à apreciação superior.Pareceu-nos que a publicação destes relatórios substituiria com vantagem, advinda principalmente de se darem em conjunto os informes habitualmente fornecidos em ambos e da sua actualização, quer a dos relatórios bienais ou trienais, quer as dos resumos semestrais da actividade. Por isso se resolveu passar a dar a público a partir de 1950, em matéria de actividade e administração do Serviço, apenas esses relatórios anuais, mantendo-se desta forma a sequência que tem sido nossa preocupação seguir nestes assuntos.


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