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Análises de Alguns Calcáreos Paranaenses

By Alsedo Leprevost

Abstract

Apesar da natural existência de grande oscilação em todos os teores, em uma mesma jazida, das análises expostas na tabela anexa podemos concluir que: 1) as amostras com teor MgO até 3%, representam 52,58% do total das análises; de 3 até 5, 7,62%; de 5 até 10, 6,77%; e acima de 10, 33,05%. 2) com teor em insolúvel até 5%, 54,23%; de 5 até 10, 16,10%; e acima de 10, 27,96%. 3) das análises em que se fez a dosagem do MnO, 47,27% deram resultado negativo. 4) com exceção da maior parte dos calcáreos brancos, todos os outros contém carbono grafítico. 5) os calcáreos da zona de Itaiacoca, Município de Ponta Grossa, além da mistura com silicato de magnésio, estão acompanhados de Mg (OH)² em teores variáveis. 6) apesar de algumas amostras de grandes jazidas apresentarem boa pureza, mister se torna um estudo rigoroso e completo das mesmas, de acordo com a finalidade, pois nelas existe grande variação, principalmente quanto ao MgO. 7) em virtude de terem sido as análises feitas em material na sua maioria enviado a este Instituto, as porcentagens calculadas nos itens acima referem-se somente às mesmas, não representando uma média no Estado.<br>We may conclude that, in the analyses presented in the enclosed table, besides the natural existence in the same bearing, a great oscillation in every percentage: 1) the samples with quantity in MgO up to 3%, represent 58,59%, of the total analyses; from 3 to 5, 7,62%; from 5 to 10, 6,77%; and above 10, 33,05%. 2) with quantity insoluble up to 5%, 54,23%; from to 10, 16,10%; and above 10, 27, 96%. 3) of the analyses in which the dosage was made of the MnO, 47,27% gave negative result. 4) with the exception of the larger part of the white calcareous, every other one contain graphitic carbon. 5) the calcareous found in the Itaiacoca region, Ponta Grossa County, besides the mixture of magnesium silicate, there an Mg (OH)² in variable quantities. 6) although some samples found in large bearing have presented good purity, it is necessary a complete rigorous study of the samples, according to the purpose, for there exist in them a large variety, mainly in MgO. 7) due to the fact that the analyses were made with material largely send to this Instituto, the percentages figured in the above items refer only to the samples mentioned, and not an average in the State of Paraná.

Topics: Calcareous, State of Paraná, analytical chemistry, Biotechnology, TP248.13-248.65, Chemical technology, TP1-1185, Technology, T, DOAJ:Biotechnology, DOAJ:Life Sciences, DOAJ:Biology and Life Sciences
Publisher: Instituto de Tecnologia do Paraná (Tecpar)
Year: 2001
DOI identifier: 10.1590/S1516-89132001000500006
OAI identifier: oai:doaj.org/article:c14ee55b483448d7bdd42ec76ccd9d56
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