Incorporation of Galvanic Sludge in the production of soil-cement blocks

Reference Presenter Authors
(Institution)
Abstract
04-063 Igor Lazzaretti Navarini, C.(Universidade Tecnologica Federal do Paraná); Baldin, C.R.(Universidade Tecnologica Federal do Paraná); Pereira Filho, J.(Universidade Tecnológica Federal do Paraná); Angulski da Luz, C.(Universidade Tecnológica Federal do Paraná); Camargo, G.(Universidade Tecnológica Federal do Paraná); Lazzaretti, I.(Universidade Tecnológica Federal do Paraná - Pato Branco); Waste generated by several industrial segments has been growing every year. In face of it, it is necessary to use appropriate techniques to reduce the risks of pollution of the environment and the preservation of natural resources. Galvanic sludge generated in the electroplating process by the metallurgy and metal-mechanic industries has heavy metals in its composition, which makes it impossible to order them in common sanitary landfills, requiring sometimes costly and differentiated disposal solutions. Likewise, the use of foundry sand, generated in large quantities in the foundry industries, in the substitution of natural sand allows the reduction of the use of natural resources in the manufacture of products used in civil construction. Therefore, the solidification technique wasapplied to stabilization in solid matrices of alumina cement and Portland cement, aiming the valorization of these residues in the production of soil-cement blocks. In the study it was used a mixture of 1: 0.67: 0.83: 0.16 (cement, galvanic silt, sand casting, water) which was made tests in phase composition, mechanical and leaching properties. The results showed that the cementitious matrix with addition of hexavalent chromium showed little change in the formation of the phases. The average compressive strength obtained in the blocks was 7.6 MPa, so obtaining satisfactory results for use in structural function. The results of the tests of the leached extract were favorable, with a good performance in the immobilization of the hexavalent chromium.
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