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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2010.tde-02122010-104440
Document
Author
Full name
Marcia de Carvalho Neves
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2010
Supervisor
Committee
Paraguassu, Antenor Braga (President)
Artur, Antonio Carlos
Rodrigues, José Eduardo
Title in Portuguese
Estudo experimental do polimento de diferentes "granitos" e as relações com a mineralogia
Keywords in Portuguese
Brilho
Granitos
Polimento
Rochas ornamentais
Abstract in Portuguese
O aspecto técnico das rochas de revestimento é o primeiro condicionante para o seu uso nas edificações, seguido das suas características tecnológicas, da tipologia do jazimento e dos possíveis defeitos decorrentes das etapas de extração e beneficiamento. O presente trabalho aborda os mecanismos que influenciam no processo de polimento, lembrando que a indústria ainda se baseia no empirismo, com generalizações não condizentes que aumentam o custo de produção das placas. Foram escolhidos três tipos de rochas "graníticas": Sienogranito (Vermelho Brasília), Migmatito (Jacarandá Rosado) e Monzogranito (Cinza Andorinha), por serem de alta comercialização e consideradas no processamento industrial como "dura", "média" e "mole", respectivamente. Foram ensaiadas no simulador de polimento de rochas (SPR), utilizando o abrasivo magnesiano e antes de iniciar o processo foi determinada a rugosidade superficial de cada amostra. Variando-se a carga aplicada na politriz, a velocidade, o tempo e monitorando a perda de massa associada ao brilho, foi possível estabelecer as condições ideais para os tipos de rochas estudadas.
Title in English
Experimental study of different "granites" polishing and its relation with mineralogy
Keywords in English
Brightness
Dimension stones
Granites
Polishing
Abstract in English
Dimension stones aesthetics are the main factor considered in their use for buildings, followed by technological characteristics, deposit's typology and possible extraction and beneficiacion effects. This paper approaches the influential mechanisms on polishing process, considering that industry still bases itself on empiricisms, with incoherent generalizations that increase production slabs cost. Three types of granite rocks were evaluated: Sienogranite (Vermelho Brasília), Migmatite (Jacarandá Rosado) and Monzogranite (Cinza Andorinha), due to their highly commercialization. The rocks are classified at the industrial process as hard, medium and soft (respectively). They were tested with a polishing rock simulator through the use of magnesium abrasives and had the surface roughness pre-determined for each sample. By altering the polishing machine applied load, as well as speed and time, and having the brightness associated weight loss monitored, it was possible to stabilish ideal conditions for the studied rock types.
 
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Publishing Date
2011-01-11
 
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