Linz-Donawitz Steel Slag for the Removal of Hydrogen Sulfide at Room Temperature

Abstract

Slags collected from the basic oxygen furnaces of two Linz-Donawitz steel making plants were tested as adsorbents for H(2)S removal at room temperature (298 K). Two different particle size fractions, namely <212 and 212-500 μm, were selected from the original slag samples. Dynamic adsorption tests were carried out using a column-bed configuration and retention capacities were calculated after bed exhaustion. Retention capacities as high as 180 mg of H(2)S g(-1) of slag were attained, in spite of the very low specific surface area of the steel slags. As expected, humidity played a crucial role in the removal of H(2)S. Particle size had also an important effect on the capacity of the adsorption beds. Analysis of the exhausted slags revealed considerable amounts of elemental sulfur on the surface of the particles. Sulfates were also found on the exhausted slags, especially on the 212-500 μm size fractions. The characterization of the slags prior and after the H(2)S adsorption experiments allowed us to postulate plausible mechanisms to understand the outstanding capacity of these steel byproduct for H(2)S adsorption.

Chemical trapping of gaseous H 2 S at high and low partial pressures by an iron complex immobilized inside the montmorillonite interlayer

“…Eventually, the resulting Fe(II) complex (confidently [Fe(II)Phen] 2+ ) binds a second S 2− ion. A similar process has been previously observed for the interaction of H 2 S with Fe 2 O 3 [40,41]. Therefore, the immobilization mechanism could be the following:…”

“…The values reported in Table 2 are mostly lower or almost equal to 1.5. Higher values are obtained only for pre-humidified Fe-slags, where the high basicity of the slags and the presence of proper amounts of H 2 O allows a different catalytic mechanism involving the oxidation of S 2− by O 2 [41]. In conclusions, Mt-Fe(III)Phen is able to immobilize a large amount of H 2 S, also at very low concentration, in the absence of oxidation processes due to O 2 .…”

“…Refs. [41,43,44]. Nguyen-Thanh and Bandosz [45] investigated Al pillared montmorillonite doped with Fe 3+ , Zn…”

Characterization of supplementary cementitious materials by thermal analysis

“…2O 2 C SO 4 2-: (4 9 16.0)/ (32.06) = ? 1.996 9 S) and formation of solid sulfates might occur [25]. If blast furnace slags are heated under oxidising conditions, the presence of H 2 S is observed only below 500°C (Fig.…”

Engineered addition of slag fines for the sequestration of phosphate and sulfide during mesophilic anaerobic digestion

“…Certain steel slag minerals have a relatively high affinity for reduced sulfur which has been demonstrated through batch and flow-through column tests (Kim et al, 2012;Montes-Morán et al, 2012;Sarperi, Surbrenat, Kerihuel, & Chazarenc, 2014). Slag interactions with sulfides appear to be markedly different than their interactions with phosphates.…”