Materials Science Forum Vol. 820

Abstract: This research aims to assess the incorporation of mass of the electric arc furnace dust (EAFD) by addition in hot metal produced in a local foundry (1.78% Si) at a temperature of 1,350°C. The EAFD is from a steel mill producer of long steel. The EAFD was added in the form of briquettes. Previously, the EAFD was characterized using the following techniques: chemical analysis, size analysis, X-ray diffraction, scanning electron microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) microanalysis. The achievement of fusion experiments in laboratory scale, took place in a vertical tubular furnace with temperature control. The fusion experiments to assess the incorporation of the EAFD mass used alumina crucibles. A flow of inert gas (argon) was maintained inside the furnace during the experiments. After cooling the furnace to room temperature, it was done the pig iron and the slag were weighed to do a mass balance to assess the efficiency of the experiments.

Abstract: The study evaluated the photocatalytic activity of TiO₂ supported on ceramic foams. In order to obtain these foams it was used a polymeric spongeprocess through replica method. Alumina ceramic foams were obtained with interconnected and open cellular structures allowing access of light through the material pores. The photocatalyst used was the commercial TiO₂ P25 Degussa impregnated into the ceramic foam by dip-coating method. These steps were used in the photodegradation of organic dye in an aqueous system. The photocatalytic tests showed 81 % efficiency in decolorizing the solution of Rhodamine B 20 mg L^{- 1} with a kinetic constant of 9.6 x 10^-3 min^{- 1}

Abstract: This study aimed to technological alternatives for reuse of vitreous residues from fluorescent lamps, which cause damage to the environment. It was prepared mass to white ceramic with and without lamps residues replacing partially feldspar in proportions of 5% and 10%. Samples were molded and fired at 1000 ° C, 1100 ° C, 1150 ° C, 1200 ° C and 1250 ° C. Physical and mechanical tests were: water absorption, linear shrinkage and rupture by flexural modulus. Samples with 10% of residues reached stability at temperature less than 1250 ° C in all determined properties, confirming the feasibility of these residues in ceramic masses. To optimize the study, it was prepared other samples in proportions of 15% and 20% of waste, at the same level of burning and testing. Results obtained ratified the possibility of using these residues as a flux in ceramic slurries.

Abstract: The objective of this work was prepared by secondary growth method, and evaluate the ability of the MCM-22 zeolite membrane separation system in oil / water in a continuous flow system. The zeolite membrane MCM-22 was characterized by different techniques: X-Ray Spectrometry Energy Dispersive (EDX), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). A continuous flow was used. The test for measuring mass flow of water / oil emulsion was conducted in peristaltic pump, wherein the membrane zeolite MCM-22 was tested. Through the results, we can observe the efficiency of the method used in the preparation of zeolite membrane and was also observed that the zeolite MCM-22 membrane, obtained by secondary growth method showed removal percentages equivalent to the standards required by Resolution 392 CONAMA.

Abstract: Civil construction materials such as brick, concrete and mortar have been incorporated with compatible wastes aiming at both reducing costs and providing an environmentally correct destination for the waste. In the present work, a sludge waste from a paper industry was added in different amounts, up to 20 wt%, into the lime used to produce mortar in mixture with sand and cement. Standard consistency tests of the pasty, as-prepared, mortar as well as flexural and compressive tests of the solid, as-cured, mortar were performed. The results indicated that the addition of up to 10 wt% of paper sludge waste into the lime increased the mortar consistency and up to 20 wt% addition also improved the mechanical strength of the cured mortar.