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functional groups exist on the surface of the sludge-based activated carbon and the surface is acidic. The concentrations of heavy metals leached from the sludge-based activated carbon are lower than... carbon; preparation condition optimization; pore structure; elemental composition; surface functional group; heavy metal leached 随着我国污水处理厂的大规模建设,运行以及污水处理率的不断提高,污水厂污泥产量显著增长.污水厂污泥是一种含水率高,含大量有机物的半干性固体废物,它含......
ARTICLE J. Cent. South Univ. (2019) 26: 440-448 DOI: https://doi.org/10.1007/s11771-019-4016-8 Treatment of bauxite residue dust pollution by improving structural stability via application...: The residue drying area (RDA) is the major source of fugitive red sand (RS) dust emissions in the bauxite mining industry and causes serious environmental and safety detriments. Polymer stabilizer (PS......
, the leached residues were collected at depths of 15, 25, 35, 45, 55 and 65 cm at regular intervals. Fig. 1 Bauxite residue sample collected from surface of BRDA (a) and SEM image of bauxite residue (b..., the infiltrated pressure was reduced, whilst the leached liquors were influenced by evaporation, which returned to depths of 20-30 cm. The distribution of the residue in the leaching column......
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was not sufficient to account for all the carbonate removed from solution. Instead, it was proposed that the reaction between ammonium chloride and carbonate leached from the bauxite residue resulted in carbonate...Trans. Nonferrous Met. Soc. China 28(2018) 2125-2134 Effect of ammonium chloride on leaching behavior of alkaline anion and sodium ion in bauxite residue Yi-wei LI1, Jun JIANG1,2, Sheng-guo XUE1,2......
of leached zinc concentrate at different time 图8 浸出渣的SEM像及EDS谱 Fig. 8 SEM image of leaching residue and EDS spectra of positions 对浸出终渣进行扫描电镜能谱分析,结果如图8所示.由图8(a)可见,矿物表面附着许多细小颗粒,矿物边缘有一些细小的絮状颗粒,也有许...主,为未反应的锌精矿,锌中浸渣几乎完全溶解. 图2 锌浸渣-锌精矿协同浸出结果 Fig. 2 Simultaneous leaching results of neutral-leach residue and zinc concentrate 图3 协同浸出渣的XRD谱 Fig.3 XRD pattern of simultaneous......
min.在该条件下,锌浸出率可以达到92.63%,而铁的浸出率仅为2.04%,实现了锌浸渣中锌的选择性浸出. 关键词:锌浸渣；铁酸锌；硫酸铵焙烧；锌回收 中图分类号:TF09；TD982 文献标志码:A Recovery of zinc from zinc leaching residue by ammonia sulfate roasting...: In order to solve the difficulty of selective leaching zinc from zinc leaching residue (ZLR), a novel process for recovery zinc from ZLR was developed by ammonia sulfate roasting-selective leaching......
曲线测定的影响,并确定了三者的最佳取值；依据峰电位,峰电流密度与扫描速度的关系,研究了体系电极过程的可逆性,发现该电极过程具有明显的不可逆性特征. 关键词:线性电位扫描伏安法；极化曲线；铬渣溶浸液 中图分类号:X 703.1 文献标识码:A Electrode reactive mechanism of chromium residue..., peak current density and scanning speed, it is found that the electrochemical process is irreversible. Key words: linear sweep voltammetry; polarization curve; chromium residue solution ......
processing residue (COPR) were investigated when the two sludge were mixed and subsequently roasted at low temperature. The results show that Cr(Ⅵ) in COPR can be reduced by the reductive gases such as carbon... residue; when the roasting temperature is above 500 ℃ and the pm is less than 30, the Cr(Ⅵ) content in the treated residue can be less than 35 mg/kg, the Cr(Ⅵ) and total Cr concentration in the toxicity......
