Electrostatic painting residues as an alternative raw material for red clay industry

Abstract

In this study, the viability of using electrostatic painting residues--paint sludge--as a raw material to the red clay industry was investigated. Red clay-based ceramic masses containing electrostatic paint residues were formulated during the study. The clays were obtained from the Rio do Rastro deposit, in Gravataí, and were of the standard formulation used in industry. Different ceramic mass formulations with additions of 0.5, 1.0, 2.5 and 5.0 wt.% electrostatic painting residue in addition to a formulation with no residue addition (standard formulation), were evaluated. The samples were uniaxially pressed in a double-effect press and were fired in an electric oven at 900, 950 and 1000 degrees C. The firing at constant temperature lasted 8 h, and heating rate was 150 K h(-1). After processing the samples were characterized in terms of their physical and mechanical properties. Environmental compatibility was also considered by the evaluation of gaseous emissions and leaching and solubilization tests according to the Brazilian standards NBR 10.005 and NBR 10.006, respectively. The results showed that it was possible to produce ceramic materials containing electrostatic painting residues within their formulations.

Paint booth waste as an alternative aggregate for the production of interlocking concrete blocks

“…Although the PBW of this study has chemical and mineralogical characteristics similar to those characterized by other researches 8 , 10 , 11 , 23 , here are no reports in the literature of investigations about their peculiar granulometry (i.e. they have a portion of fine material and aggregates of different sizes).…”

“…Similar results were verified 11 where it was found that the incorporation of 20% automotive paint waste in bituminous mixtures did not cause significant changes in the mechanical properties, compared to the reference mixtures. Also, considering that industrial paint waste has a porous microstructure 5 , 10 , the mixture with a content of 40% PBW reduced the average strength of 19.73%, when compared with mixing (0% PBW) possibly caused by voids in the concrete matrix.…”

“…These processes are carried out with the use of cementing agents, such as Portland cement and cement with the addition of pozzolanic material, making it possible to encapsulate the contaminants and reduce the leaching of heavy metals and organic pollutants 8 , 9 . In this context, PBW (in the form of sludge) has been studied as a partial replacement of lime and sand in mortar mixtures 5 , in the incorporation of red ceramic 10 and in bituminous mixtures 11 and also as a polymeric additive in concrete mixtures 12 .…”