Energy & Fuels, 10/13/2016
Blast furnace slag (BFS), a waste product of the iron manufacture process, contains a mass of silica obtained from gangue of the iron ores and ash content in fuels and fluxes. In recent years, large amounts of BFS have not been fully utilized, leading to the surrounding environmental pollution and the additional administration costs for steel enterprises in China. A simple method based on acid precipitation heated to 90-100 °C for 2 h was developed to produce white carbon black (WCB) from BFS. BFS and WCB washed by different concentrations of hydrochloric acid were characterized by X-ray fluorescence, scanning electron microscopy, X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, Fourier transform infrared spectroscopy (FTIR), and thermogravimetry and differential scanning calorimetry. White carbon black prepared by 5 mol/L acid (WCB5) contained 91.32% silica and 8.15% moisture. The major impurities of WCB produced from BFS were Ca, Mg, Al, and Ti. Acid washing resulted in impurities with a lower concentration. XRD revealed that WCB belonged to the amorphous material. FTIR data indicated the presence of siloxane and silanol groups. The BET surface area was 245 cm2/g. Moreover, the dibutyl phthalate (DBP) absorption value was controlled between 2.0 and 3.5. It showed that physical and chemical characteristics of WCB were up to the China industry standard (HG/T3061-1999).
Ftir-Spektroskopie ; Siliciumdioxid ; Eisenerz ; Brennstoff ; Stahl ; Salzsäure ; Amorpher Werkstoff ; Siloxan ; Phthalat ; Eisen ; Rußschwarz ; Produktionsprozess ; Umweltverschmutzung ; X-Strahl ; Röntgendiffraktion ; Kalorimetrie ; Syntheseverfahren ; Engineering ; Chemistry;
American Chemical Society (via CrossRef)