The spinning navel is a component widely used in the textile industry. Such navels are basicaly alumina or high-alumina ceramic parts, and since they are not produced in Brazil, they are imported at high costs. For this reason, an alternative material for the fabricationof hte navel was proposed, consisting of granite powders.Since granites are basically silicates and exhibit lower mechanical strength and hardn...
In this work, physical properties of sintered compacts made from granite powder reinforced with alumina particles were determined. This composite is proposed as an economic alternative to the more expensive pure alumina, currently used in the fabrication of spinning navels for the textile industry. The composite material was compared to the materials from some spinning navels currently in use in a textile plant...
During the production of aluminium, a residue called dross is produced, which contains oxides. This residue can be used for the production of cement and refractories. Aluminium drosses, when not inertized, are dangerous to human health and may contamine the environment. In this work, aluminium dross was milled and classified by sieving. Powders obtained were pressed into bars and sintered at 1400ºC for 1h with ...
Aluminum dross, a by-product from the production of aluminum, contains a large amount of high-melting point oxides which make it a potential candidate for a refractory material. In order to improve the mechanical properties of this material, different amounts of mullite ( 0 to 35 wt%) were added. The mixtures obtained were pressed into bars and sintered at 1400ºC for 1h. The pyrometric cone equivalent (PCE) was...
This work describes a study on the technical viability of using Rain Forest granite rejects as an alternative raw material for the fabrication of ceramic tiles with low water absorption. The aim is to employ these tiles in the construction industry, thereby reducing the environmental impact of granite residues and minimizing fabrication costs. Initially the rejects were milled and sieved. A small amount of wate...
Na exploração de granito na região da Serra da Meruoca (CE) é gerada uma grande quantidade de resíduos prejudiciais ao meio ambiente. Para dar uma utilidade a estes resíduos, selecionou-se um granito explorado em grande volume (Rain Forest). Os resíduos, em forma de pó, foram submetidos a um processo simples de beneficiamento, moagem e peneiramento, sendo caracterizados por difração de raios X. Estes pós foram ...
This study aims to evaluate the potential of co-use of granite waste (Rain Forest) and kaolin waste as raw material for the manufacture of ceramic coating of low water absorption. Raw materials were characterized by X-ray diffraction. Kaolin residue was added to the residue of granite in the following proportions (in wt%): 0, 10, 20, 30, 40 and 50%. Specimens were fabricated by uniaxial pressing and fired at 11...
Orientador: Carlos K. Suzuki; Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica; Resumo: O Brasil é na atualidade um dos principais produtores de silício para o mundo, sendo que a quantidade de quartzo extraído para a sua produção incluindo o ferro-silício, é da ordem de 2 milhões de toneladas/ano. Para a obtenção do quartzo destinado à redução carbotérmica em silício, nos d...
Orientador: Carlos Kenichi Suzuki; Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica; Resumo: O "sweeping" ou eletrodifusão em quartzo sintético é um processo realizado à temperatura da ordem de 500°C com a aplicação de um campo elétrico intenso. A eletrodifusão em quartzo sintético usando átomos de 'AG¿ em ar é de grande importância porque pode tornar o material altam...