The Experimental Study on FGD-Gypsum Improving Coastal Saline-Soil

Abstract

Abstract-Two kinds of flue gas desulfurization gypsum (FGDgypsum) A# and B# were chosen to improve coastal saline-soil at the different ratios of quality (0%, 0.5%, 1%, 2.5%, 5%) respectively in soil column leaching experiment. A came from a steelworks whose technology was wet gas gush churn tower sintering flue gas desulfurization and B came from a coal-fired power plant whose technology was conventional spray wet limestone-gypsum flue gas desulfurization, A gypsum contained more impurities than B. The results showed that, compared with the control, applying A could increase soil saturated hydraulic conductivity and leaching sodium quality by 5~6 times, 11.0%~22.2%, and decrease soil pH, exchangeable sodium percentage (ESP) by 0.41~0.11, 25.1%~76.7%, respectively. The improvement effect of B was superior than that of A due to higher Ca 2+ dissolution efficiency and lower chloride ion content of B. Compared with A, B could increase soil saturated hydraulic conductivity and leaching sodium quality by 57.5%~89.1%, 51.3%~74.0%, and decrease soil pH, ESP by 0.10~0.36, 66.7%~83.6%, respectively. When two kinds of FGD-gypsum improving coastal saline-soil, the change rules of soil's physical and chemical properties were that, with increasing ratios of FGD-gypsum, soil saturated hydraulic conductivity increased before leveling off, leaching sodium quality gradually increased, soil pH declined before leveling off, ESP gradually reduced. And soil leaching sodium quality had relationship with the improvement of soil hydraulic conductivity and the substitution reaction of sodium and calcium. The application of FGD-gypsum to improve saline-soil, this kind of FGD-gypsum which has low chloride ion content, high calcium ion dissolution efficiency is recommended.

Sulfur Migration Behavior in Sintering and Pelletizing Processes: A Review

“…This method has the advantages of high desulfurization efficiency, high operation maturity, and high byproduct availability. [52,89,90] The main reactions are given by…”