Oxidation Enhancement of Gaseous Elemental Mercury Using Waste Steel Slag under Various Experimental Conditions

Abstract

In this study, the oxidation characteristics of elemental mercury were assessed based on the input gas environment, temperature, and particle size distribution of the steel slag. Experiments were performed at room temperature, 100 °C and 200 °C, under air and simulated gas environments. The oxidation reaction of elemental mercury was conducted using steel slag samples of 1 mm, 2.36 mm, and 4.75 mm at various conditions. From the basic characteristic analysis of the steel slag, it was found that the steel slag exhibits a similar composition to that of fly ash, and it can be utilized as an oxidizing agent. Results show that regardless of the temperature and the particle size distribution of steel slag, the oxidation reaction of elemental mercury rarely occurred in the air environment. However, in the case of the HCl gas environment, it was observed that the smaller the steel slag particle size, the stronger the oxidation reaction. It is believed that the oxidation efficiency of the steel slag increased as the contact area between the gas and particles increased. The oxidation reactivity was nearly two times higher in the temperature range of 100 °C to 200 °C than it was at room temperature. It is advised that further research be undertaken in order to determine the precise temperature range at which the oxidation reaction occurs.

Application Study on the Activated Coke for Mercury Adsorption in the Nonferrous Smelting Industry

“…According to previous studies, mercury removal can be effectively improved by increasing the adsorbent dosage [27]. Obviously, in practical applications, the dosage of the AC will be much higher than the milligram level to ensure operational stability and long-term durability [28][29][30]. Therefore, it can be concluded that the AC exhibits a relatively wide range of capabilities for removing Hg 0 from nonferrous smelting flue gases.…”

Thermodynamic Analysis of Mineral Phase Composition of Steel Slag System

“…The higher P 2 O 5 content inhibited the conversion of β-C 2 S to γ-C 2 S and hindered the self-powdering of steel slag. The transformation of β-C 2 S to γ-C 2 S in the slag produces a volume expansion of about 11%, allowing the slag to undergo self-powdering [10][11][12]. Chuan-ming Du et al [13] investigated the effect of Fe 2+ (Fe 2+ /T.Fe) content on the leaching solid solution of P 2 O 5 using the leaching of concentrated phosphorous solid solution from steel slag.…”