stability of arsenic in arsenic-containing copper slag

Overview

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Key numbers

The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:

• chemical compositions of the selected slag tailing are Fe2O3 (54.8%) and SiO2 (28.1%). These tailings
• arsenic undergoes redistribution, primarily among flue dust and slag, with approximate ratios of 76-85%
• and 7%-17%, respectively (Potysz et al., 2015). Consequently, the captured flue dust, containing elevated
• Concentrations, is recycled back into the smelting process for the high content of Cu (up to 40%). This
• tailings can reach up to 7.59%, posing a potential environmental pressure (Potysz et al., 2015). The
• concentrate (recycled to the smelting furnace due to its high Cu content of 20%) and slag tailing. The slag
• through pollution control devices, capturing flue dust with high Cu content(40%) but also containing
• cathodoluminescence detector with a wavelength range spanning from 200 nm to 850 nm was utilized.
• for all the selected elements falls within ±5 wt. %.
• 1979).This method categorized the speciation of elements into five fractions, as detailed in Table 1. The
• The bulk chemical compositions of the selected slag tailing, presented in Table 2, primary comprises
• Fe2O3 (54.8%) and SiO2 (28.1%), with minor quantities of Al, Ca Na, and K oxides, which is different from
• Portugal (Mateus et al., 2011), and Poland (Kierczak et al., 2013) (Table 1). The elevated Fe content in
• Table 1, arranged in descending order as follows: Zn> As> Cu> Pb> Cr> Ni. The notably elevated levels of
• tailing were categorized as follows: < 45 μm (25.4%), 45-75 μm (52.4%), 75-106 μm (14.3%), and >106 μm
• (7.9%), respectively. The selected slag tailing predominantly exists as fine particles (<75 μm), constituting
• up to 77.8%, with the primary presence observed in the 45-75 μm range (52.4%). Morphological
• and durations (Gorai et al., 2003). The mineral phases present in slag tailing encompass a range of
• 76-85% with 7%-17% of arsenic existed in slag during flash smelting processes (Potysz et al., 2015). For
• the high Cu content (up to 40%) in the collected dust, the collected arsenic-containing dust is recycled to
• presence in residual form (82.1%), Fe-Mn oxide-bound fractions (9.6%), and organic matter-bound states
• (6.2%). The elevated fractions of As in residue and Fe-Mn oxides bound suggested that As are mainly
• in slag tailing could be existed in both As(III) and As(V) with the proportions of 59.4% and 40.6%,
• The results of CN-SWEP and TCLP leaching tests (Table 3) indicate that the leaching of elements (As, Cu,
• to elements when the exchangeable and carbonate-bound fractions constitute less than 1% of the total
• exceed 50% of the total value. RAC values falling within 1-10%, 11-30%, and 31-50% are categorized as
• The bulk chemical compositions of the selected slag tailing are Fe2O3 (54.8%) and SiO2 (28.1%), with
• As(III) and As(V) with the proportions of 59.4% and 40.6%, respectively. The results of CN-SWEP and
• Table 1 Sequential extraction procedure.
• aliquot of 30% H2O2 (pH=2.0 with HNO3) was then added under
• 20% (v/v) HNO3 was added and the sample was diluted to 100 mL
• Table 2 The chemical compositions of the selected copper slag.

Methods (brief)

• The slag tailing was collected from a Cu smelter, where the Cu concentrate comprised covellite (CuS),
• pyrometallurgical impurities. Approximately 5 kg of fresh slag tailing was collected from the stockpile,
• increment of 0.01º. Identification of minerals in each sample was accomplished by referencing the ICDD
• spectrometry (XRF). To extract the toxic elements (As, Cu, Cr, Ni, Pb, and Zn), a microwave digestion
• digestion and quantify, the concentrations of the selected toxic elements were determined by inductively
• coupled plasma mass spectrometry (ICP-MS). To ensure the accuracy of both extraction and analytical
• procedures, NIST standard reference materials and blank samples were employed. The precision attained
• concentration of toxic elements within each fraction was subsequently determined using ICP-MS.
• conducted to determine the potential leaching toxicity of toxic elements. The samples were leached at a
• of toxic elements in leachates were analyzed by ICP-MS.
• the selected slag tailing. This procedure involved the extration of samples using a CH3COOH solution
• (pH=4.95 ± 0.05) with the L/S ratio of 20 L/kg. The samples were continuously agitated at 100±10 rpm
• 4500 rpm for 10 min was subsequently analyzed using ICP-MS.
• the high Cu content (up to 40%) in the collected dust, the collected arsenic-containing dust is recycled to
• Vitkova M, Ettler V, Mihaljevic M, Sebek O (2011) Effect of sample preparation on contaminant leaching
• https://doi.org/10.1016/j.conbuildmat.2020.121165.
• 1 1.0 g samples were extracted with 10 mL 1.0 M MgCl2 (pH=7.0) Exchangeable
• 20% (v/v) HNO3 was added and the sample was diluted to 100 mL

Implications

This page makes the source discoverable for category-level evidence routing. Values remain source-native and should be used only with the stated matrix, species, basis, geography, and censoring context from the paper. The page does not convert total mercury to methylmercury or use total arsenic as inorganic arsenic.

Wiki pages this source may touch

• Fish — marine, predatory (tuna, swordfish, shark, king mackerel)
• Fish — marine, non-predatory (sardines, anchovies, salmon, cod)
• Arsenic

Verification notes

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Update history

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