Arsenic removal from lead-zinc smelter ash by NaOH-H2O2 leaching

Gu, Kunhong; Li, Wenhua; Han, Junwei; Liu, Wei; Qin, Wenqing; Liu, Cai

doi:10.1016/j.seppur.2018.07.023

Cited by 71 publications

(13 citation statements)

References 34 publications

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“…Please note that the concentrations of related ions were fixed at 1 mol/L, and both the partial pressures of oxygen and hydrogen were at the standard atmospheric pressure of 101,325 Pa. Figure 4 shows that increasing the potential value was beneficial to the conversion of As → As(III) → As(V). In alkaline solution, the concentration of H + is so low that most of As(V) exists as monomeric AsO [30]. After other metal impurities were removed from the leachate with the addition of Na 2 S [25], the purified leachate was then subjected to the causticization process, which was performed to precipitate arsenic with CaO powder in a flask with three necks.…”

Section: Eh-ph Diagrammentioning

confidence: 99%

Section: Eh-ph Diagrammentioning

confidence: 99%

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Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Liu

Han

et al. 2019

Minerals

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This study investigated the feasibility of using an alkaline pressure oxidative leaching process to treat lead smelter flue dust containing extremely high levels of arsenic with the aim of achieving the selective separation of arsenic. The effects of different parameters including NaOH concentration, oxygen partial pressure, liquid-to-solid ratio, temperature, and time for the extraction of arsenic were investigated based on thermodynamic calculation. The results indicated that the leaching efficiency of arsenic reached 95.6% under the optimized leaching conditions: 80 g/L of NaOH concentration, 1.0 MPa of oxygen partial pressure, 8 mL/g of liquid-to-solid ratio, 120 °C of temperature, 2.0 h of time. Meanwhile, the leaching efficiencies of antimony, cadmium, indium and lead were less than 4.0%, basically achieving the selective separation of arsenic from lead smelter flue dust. More than 99.0% of arsenic was converted into calcium arsenate product and thus separated from the leach solution by a causticization process with CaO after other metal impurities were removed from the solution with the addition of Na2S. The optimized causticization conditions were established as: 4.0 of the mole ratio of calcium to arsenic, temperature of 80 °C, reaction time of 2.0 h. The resulting product of calcium arsenate may be used for producing metallic arsenic.

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Section: Eh-ph Diagrammentioning

confidence: 99%

Section: Eh-ph Diagrammentioning

confidence: 99%

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Liu

Han

et al. 2019

Minerals

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“…Zinc oxide slag is commonly leached in the inorganic acid or alkaline solution, such as sulfide acid, sodium hydroxide and ammonium salt (Rao et al, 2015;Şahin and Erdem, 2015). Once the appropriate leaching reagent was selected, zinc oxide is dissolved as Zn 2+ in the solution, and normally recovered by the extraction and electrodeposition (Gu et al, 2019). Inorganic acid (e.g., sulfuric acid) and alkaline (e.g., sodium hydroxide) leaching reagents usually erode the leaching equipment and cause environmental problems (Zhang et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid

Wang¹,

Gao²,

Song³

et al. 2021

Physicochem. Probl. Miner. Process.

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As an organic acid with the characters of low corrosivity and extensive source, 5-sulfosalicylic acid (5-SSA) was firstly utilized as a potential leaching reagent for the recovery of zinc from metallurgical slag. Effects of stirring speed, leaching temperature, 5-SSA concentrations and size fraction on the leaching zinc leaching rate were investigated. A zinc leaching efficiency of 94.2% was achieved under the appropriate operating conditions (450 rpm of stirring speed, 50 ℃ of leaching temperature, 0.3 mol/L of 5-SSA concentration and d90=65 µm of size fraction), indicating that 5-SSA was an excellent leaching reagent of zinc oxide. SEM-EDS and specific surface aperture analyzer further reveal the well-developed micropores and cracks from zinc metallurgical slag, which could be assigned to the removal of zinc oxide encapsulated in the sample. In addition, the leaching kinetics of zinc metallurgical slag in the 5-SSA was studied. It was found that the surface chemical reaction model satisfactorily predicted the zinc leaching rate. A reaction kinetic equation was finally established for the zinc leaching rate.

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“…If arsenic pyrite enters the gold smelting process, the arsenic is enriched and the flow direction is difficult to control, making it more difficult to handle. If the associated relationship between gold and arsenopyrite is not tight and does not affect the gold recovery rate, the best method for removing arsenic is to discharge it into the tailings through a selective flotation process to ensure that arsenic is relatively stable and at a lower state [27][28][29]. Cyanide leaching is a traditional and methodically developed process, which is effective for extracting gold from refractory ores [30].…”

Section: Introductionmentioning

confidence: 99%

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

et al. 2019

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The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum. The gold grade in the mineral was 15.96 g/t and the particle size distribution of gold was extremely uneven. Most of the gold particles were less than 10 μm and wrapped with gold-bearing minerals, making it difficult to achieve liberation during grinding. According to the characteristics of the refractory gold deposit, the gravity–flotation combined beneficiation process was used to recover the liberated coarse gold and the fine gold in the sulphides. The closed-circuit experiments obtained excellent indicators. The grade and recovery of gold in the gravity separation concentrates reached 91.24 g/t and 57.58%, respectively. The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.

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Arsenic removal from lead-zinc smelter ash by NaOH-H2O2 leaching

Cited by 71 publications

References 34 publications

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid

Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia

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