The results predicted by a Box–Behnken design indicated that the maximum immobilization efficiencies of soil Pb, Cu, Zn and Cd could be achieve up to 99.88, 96.11, 99.78 and 87.88%, respectively ...
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Some of the ZnO and CuS spilled from the liquid into the flume. After reduction, CaO·SiO 2 was generated and moved to the upper layer. 1 Introduction. Metallurgical solid waste …
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Lead smelting slag (LSS) usually contains high content of heavy metals (HMs) such as lead (Pb), zinc (Zn), copper (Cu), cadmium (Cd), and arsenic (As) (Liu et al., 2018). However, its complex mineral composition and distribution characteristics make the utilization efficiency of resources low at present, and disposal is usually done by open ...
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Large amounts of lead slag are produced during the production of primary lead and secondary lead. Considering lead concentrate smelting as an example, a primary lead smelting system production of 1 t of lead will discharge 7100 kg of lead slag (Hou, 2011).At the secondary lead recycling process, for each ton of metallic lead produced, 100–350 …
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The authors identified the possibility to recover major fractions of Cu, Zn, Pb and Mo from slag . Table 9 Processes of slag cleaning to give Cu rich Cu-Fe alloy. ... When grinding the material longer than required for optimum recovery there is no improvement or even slight decrease in the Fe recovery . It was found that a certain …
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B. intermedia TSBOI has been isolated from soils polluted with heavy metals. After long-term heavy metal. Conclusions. This study confirmed the ability of B. intermedia TSBOI to immobilize Cu, Pb, and Zn based on MICP and expanded the potential mechanism of heavy metal resistance and urease function of B. intermedia TSBOI from …
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As crystallization of slag occurs during cooling Zn and Pb are re-distributed among several crystalline phases (silicates, oxides, sulfides or metals) and residual …
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Zn and Pb leached concentrations of PC and M-BOF treated contaminated soils conducted by TCLP experiments are plotted in Fig. 1 and the pH levels of the supernatants measured at the end of the tests are reported in Fig. 2. ... and Environmental Behavior Performance of Magnesium Potassium Phosphate Cement Binder …
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As far as E x is concerned, partitioning behavior of elements revealed that Cu is mainly retained in slag concentrate while Fe, Zn, Pb, Cr, and Ni are chiefly distributed …
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From the Middle Ages until the beginning of the twentieth century, extensive Zn–Pb mining and smelting was carried out in East-Belgium. By lack of waste treatment techniques and sustainable management practices, metal-bearing slags and unprocessed waste were dumped in huge tailings, which still represent an important source of …
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The resulting mixture was subjected to adequate grinding using an agate mortar and placed in a porcelain boat for calcination in a muffle furnace at 400 ℃, 600 ℃, and 800 ℃ (furnace heating rate was 10 ℃/min) for 1 h. ... shows the removal efficiency of Ni, Cu, Zn, Cr, Ca, Fe, and Al; (b) shows the variation of pH at different ...
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A novel iron-based composite modified by refinery sludge for fixing Pb, Zn, Cu, Cd, and As in heavy metal polluted soil: Preparation, remediation process and feasibility analysis ... (23°52′N, 103°21′E) near the abandoned lead slag yard in Gejiu City, Yunnan Province, China. The soil was air-dried and crushed, all of which were mixed ...
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behavior of Cu, Zn, and Pb from contaminated soils under dierent pH conditions and simulated inter-root environment solution; (ii) study the eectiveness of various washing agents in removing heavy metals and to perform a thermodynamic analysis of suit-able washing agents; and (iii) investigate the removal
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Adding steel slag to the acidic contaminated mine soil can immobilize heavy metal ions, but immobilization persistence of the metal ions needs to be determined.In this study, dynamic column simulation experiments were set up to compare the immobilization persistence of Cu, Cr, Pb and Zn ions in original soil and with the addition of slag, lime …
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Copper slags are mostly associated with hazardous and toxic metals, such as Cu, Pb, Mo, Zn, Co, etc. These undesirable elements in the copper slag make it …
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The results show that more than 80% of Al, As, Cu, Mn, Fe and Zn in the Pb/Zn smelting slag were leached at 65(o)C, pH 1.5, pulp density 5%, but only about 5% of Pb.
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Nonferrous metals (Cu, Pb, Zn) remaining in copper converting slag have become a global problem in copper pyrometallurgy. 1 By the end of 2020, more than 30 copper smelters were put into operation in China with an annual capacity of refined copper of 10,225 kt, ranking first in the world. 2,3 After more than 100 years of development, …
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1. Introduction. Copper is recovered from ores mainly by means of pyrometallurgical processes that are responsible for generating waste slag, estimated at …
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The Fe grade reached 91.55%, and the Fe recovery ratio was 98.13%. Zuo et al. analyzed the migration behavior and trend of elements during the reduction of copper slag [16].Zhang et al. used ...
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The highest BAF of each metal calculated was as follows: Cr (0.091 in winter) > Cu (0.054 in autumn) > Pb (0.016 in summer) > Zn (0.011 in summer). Highest root-rhizome TF values were recorded for four metals: 6.450 for Cu in autumn, 2.895 for Zn in summer, 7.031 for Pb in autumn, and 2.012 for Cr in autumn.
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The complexity in the composition of slag from the zinc hydrometallurgy process is related to the content of valuable metals and impurities in raw materials (e.g., Zn, Pb, Fe, Cu, Cd, In, Co, Si ...
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The study confirms that an increase in the matte grade and temperature lead to higher partitioning of Pb, Zn, and As to the slag. With increasing matte grade, …
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The results indicated autotrophic bioleaching can solubilize valuable/toxic metals from slag, yielding maximum extraction efficiencies of 90% for Zn, 86% for Cd and 71% for In, although the extraction efficiencies of Pb, As and Ag were poor. The bioleaching performance of Zn, Cd and Pb was independent of leaching system, and leaching …
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However, P had little effect on the Cu and Zn phytoavailability; while the acid extractability of Cu and Zn induced by SBET (pH 2) were even elevated by up to 48% and 40%, respectively, in the H 3 PO 4 treatments (PA and PR + PA). Our results indicate that phosphate was effective in reducing Pb availability in terms of water solubility ...
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1. Introduction. Copper smelting slag is a waste source generated from copper pyrometallurgy production which typically contains 40 wt.% Fe and a considerable quantity of both environmental-hazardous and valuable metals Cu, Zn, Pb, Ni, Cr, Cd and toxic element As (Guo et al., 2018; Ma et al., 2016; Meng et al., 2020).It is predicted by …
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This paper focuses on determining parameters such as natural humidity (1.8%) and bulk density (1267 kg/m 3) of the slag. Also, its toxicity was analysed using …
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Download scientific diagram | Slag from Pb–Zn concentrates foundry: a before grinding, b after grinding from publication: Synthesis of an Alternative Hydraulic Binder by Alkali Activation of a ...
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degree of crystallinity from glassy to coarse grained, porosity, temperature crackling density and. pahoehoe surface texture (F ig ure 1). Composition of fragments and respectively their density ...
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Here we tested the capacity of zero valent iron nanoparticles (nZVI) combined with two organic amendments, namely, compost and biochar, to immobilize metal(oid)s such as As, Cu, Pb, and Zn. In addition, the effects of the amendments on the development of Brassica juncea L., a plant widely used for phytoremediation purposes, …
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The reduction pattern of Pb > Zn >Cu > Cd >As was reported in sesame seed. Although the oil refining had been greatly reduced the Pb of oil sample, but it had yet been much higher than the ...
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