Effect of surface area during stabilization of electric arc furnace dusts from steel foundries

Abstract

This study examined the effect of waste particle size on stabilization performance of hazardous electric arc furnace dusts (EAFD) from steel foundries through the measurement of the temperature rise during hydration and heavy metals leaching. EAFD was characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), granulometry, and acid neutralization capacity (ANC) analysis. Portland cement was used to stabilize EAFD. Two types of paste samples, with EAFD content varying between 0% and 50% by weight, were prepared. The first type contained original EAFD, and the second contained ground EAFD with increased surface area. The increase in the temperatures of the mixes was monitored during the hydration reactions of the pastes. Ground EAFD yielded higher temperature rise rates than the original EAFD. Heavy metals leaching were determined by toxicity characteristics leaching procedure (TCLP). Pastes containing ground EAFD up to 50% yielded lower zinc and lead leaching than that of samples containing original EAFD. The results revealed that surface area of the EAFD may affect the stabilization performance and therefore care should be given to storage conditions at the foundries.

Use of marble cutting sludges for remediating soils and sediments contaminated by heavy metals

“…Chemical immobilization by means of soil amendments has been recently investigated as a valuable alternative technique for a wide range of contaminated sites. A number of natural or synthetic materials, such as carbonates, phosphate rocks [5], cement [6], zeolites [7, 8], municipal biosolids [9], and red mud [10, 11] have been recently tested in order to evaluate their ability to immobilize toxic trace metals. These amendments can lead to the immobilization of metals in a variety of ways.…”

Industrial hazardous waste management in Turkey: Current state of the field and primary challenges

“…The wastes typically generated in basic metals sector are emission control dust [38][39][40] or sludge containing heavy metals, spent pickle liquor, paint wastes containing heavy metals, strong acids and bases, cyanide wastes, etc. [41].…”