Extraction behavior of As, Pb, and Zn from mine tailings with acid and base solutions

Remediating Lead, Zinc, Cadmium and Arsenic Contaminated Steel Smelting Site with Hydrochloric Acid and Sodium Hydroxide

“…pH, OM, CEC and particle size distribution were important parameters of soil that Fig.1). Increase of lead removal was more obvious at concentration of 0.5M which consistent with Yang [9]. The filtrate pH (table 1) at 0.5M was significantly lower (1.83) than that at 0.1M (4.05).…”

“…Apart from dissolution of discrete arsenic contained compounds (e.g. Fe-Mn oxides) [1,6,9], higher pH also contribute a lot to the increase of arsenic, OH -anion in higher pH solution could substitute arsenic anion and prevent re-adsorption of arsenic anion onto same adsorption sites [7,9]. The use of 0.2M of sodium hydroxide in the second washing step resulted in significantly higher arsenic removal and the removal was more apparent at lower hydrochloric acid concentration (table 3, Fig.4).…”

“…Several washing agents have been investigated to decontaminate metals from soil, like chloride solutions, chelating agents, surfactants, and reducing and oxidizing agents [7], in which the acid and the chelant are two most prevalent washing agents [8]. Hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid have been studied in bench and field scale experiments for remediaton of contaminated soils, sediments, and sludge [9], hydrochloric acid was efficient in zinc extraction [10] and could achieve high lead extraction efficiency even at low concentration and short mixing time [1], it also exhibit strong ability in extracting cadmium from weathered, heavily cadmium contaminated soils [11] and show certain ability in extracting arsenic from arsenic mine tailings [9]. However, in sites, lead, zinc, cadmium were commonly coexist with arsenic, and hydrochloric acid alone was not sufficient to effectively reduce all metals to lower than required value due to their dissimilar chemical properties [12].…”

Removal and Recovery of Arsenic from Gold Concentrate

“…금 정광과 광미에서 금을 추출하기 위한 연구가 다양하게 진행이 되어왔으나, 시안화물 (cynide)사용에 따른 환경적 제약과 금 이외의 포함된 다양한 불순물 함량으로 인해 leaching공정에 어려움을 겪고 있다. [3][4][5][6] …”

Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

“…Vol. 18(1), p. 6~15, 2013 율이 낮아지는 단점이 있다 (Park et al, 2008;Park et al, 2009a;Park et al, 2009b;Yang et al, 2009). 고형화 및 안정화법은 중금속의 이동 성을 현저히 낮추는 중금속 오염토양의 가장 범용적인 정 화기술이나 국내 법규가 오염물의 농도를 왕수추출에 의 한 전함량 분석법을 적용함에 있어 국내 법적기준을 충족 시키기 쉽지 않다 Kim et al, 2012).…”