Meanwhile, the concentration of Pb,Zn and other heavy metals is rather high in the oxidation zone and decreasesdownward to levels that are unbelievably low for Pb-Zn mine tailings. Theseobservations suggest that heavy metals should be re-immobilized by secondaryminerals, rather than primary minerals, in the oxidation zone, and could be leachedout from suboxic environment due to low rate oxidative dissolution which preventsthe precipitation of secondary minerals in significant amount. Thus, cover scenarioswhich establish a suboxic environment beneath the cover layer might not always beeffective in preventing heavy metal release from mine tailings.Sequential extraction studies indicate that, in addition to heavy metal leaching,oxidation of the mine tailings increased the mobility of residual Zn, and Cu, while Pb remains immobile due to the formation of anglesite (PbSO4). Using the seven-step extraction technique developed by Dold (J. Geochem. Explor., 2003, 80: 55-68), galena dissolves in significant amount at step 2 most probably due to the strong complexing of Pb2+ by acetate, while other metal sulfides dissolve at step 6, which suggest that this extraction technique could not be used to evaluate the mobility of lead in natural environment

重金屬含量均低于新鮮尾礦亚洲男人天堂AV网站在线观看不卡，但以硬化層中的含量最高(Pb欧美日韩国产成A免费网站、Zn含量分別為0.47%和0.93%)正在播放国产精品，往下大幅度降低国产美女爆乳主播在线播放，表明尾礦風化過程中形成的次生礦物對Pb、Zn等重金屬元素有較強的固定作用亚洲理论片一区二区大全，而次氧化帶的淋溶作用造成了金屬元素的大量流失日日摸日日碰夜夜爽97无码；(4)與新鮮尾礦相比，硬化層中鉛的可遷移性大大降低亚洲女人色色，硬化層之下尾礦樣品中鉛的可遷移性也不同程度降低久草A片在线视频，這是由于硫化物氧化產生的硫酸根與尾礦中的鉛反應形成鉛礬(PbSO_4)的緣故中文字幕36页；(5)氧化作用使尾礦中的znsese亚洲图片、Cu等重金屬的可遷移性不同程度地增大，其中對鋅的可遷移性影響最大黄色视频条乱，銅的可遷移性與鐵比較相似国产av无码影音先锋，鉛則容易與硫化物氧化形成的SO_4~(2-)反應形成鉛礬(PbSO_4)；(6)為了減少尾礦污染和修復礦山環(huán)境精品一IGAO一视频网，人們提出了各種不同的尾礦覆蓋方案色色五月天A，本文的研究結果表明国产性爱免费在线，這些方法不一定能夠有效地阻滯污染元素的遷移。

anglesite：硫酸鉛礦

angles back to back 背對背角鋼 | anglesite 硫酸鉛礦 | angling dozer 斜板推土機

anglesite：鉛礬

angleofnip 挾角 | anglesite 鉛礬 | anglesteel 角鋼

anglesite：硫酸鉛礦;鉛礬

硫砷鹽類 sulfarsenates | 硫酸鉛礦;鉛礬 anglesite | 硫酸鐵泥煤 vitriol peat

anglesite：硫酸鋁礦

"斜鏟推土機","angle-dozer" | "硫酸鋁礦","anglesite" | "角加速度","angular acceleration"

lead vitriol; anglesite：硫酸鉛礦;鉛礬

"鉛赭石","lead ocher; plumbic ocher" | "硫酸鉛礦;鉛礬","lead vitriol; anglesite" | "鉛明礬石","lead-alunite"