Implementation of industrial waste ferrochrome slag in conventional and low cement castables: Effect of microsilica addition

Research on the use of Ferro-Chrome slag in civil engineering applications

“…Both the molten FeCr and the slag flow out into ladles. After gravity separation from the metal, the molten slag, slowly cools in the air, forming a stable and dense crystalline product having an excellent mechanical properties similar to basalt [5,6]. The granulated slag (size less than 4.75mm) samples result from water cooling of the slag whereas lumped slag (size between 8 to 20 mm) samples produced when slag is air-cooled [7].…”

“…The granulated slag (size less than 4.75mm) samples result from water cooling of the slag whereas lumped slag (size between 8 to 20 mm) samples produced when slag is air-cooled [7]. The FeCr slag is classified as ferrous slag under iron-alloy slags [6].…”

“…Studies [5,6,8,[12][13][14][15] reported that FeCr slag possesses excellent physical properties compared to other aggregate since it has good adhesion and good abrasion, has a rough and porous surface (figure 1) and it lacks clay and organic ingredients in tis composition. However, the water absorption rate is relatively high due to the porous nature of the slag.…”

“…The results from the study revealed that ferrochromium aggregates increase the strength of concrete and also the abrasive wear resistance while it has negligible influence on the porosity and water absorption of concrete. A Study [6] which was carried out on the effect of microsilica addition within a low cement castables matrix of calcined bauxite and ferrochrome slag showed that slag containing castables achieved good thermal properties such as thermal shock resistance, permanent linear change, and pyrometric cone equivalent.…”

“…Chemical analysis on various FeCr slag samples have detected traces of heavy metals specially chromium oxide, Cr (VI) [2][3][4], [6][7], [11], [14], [17]. The waste slag contains about 6-12% chromium as chromium oxide and it has the potentiality of releasing hazardous chromium compounds.…”