Separation of Cu and As in Cu-As-containing filter cakes by Cu 2+ -assisted acid leaching

Ke, Yanxiong; Shen, Chen; Min, Xin; Shi, Meiqing; Chai, Liyuan

doi:10.1016/j.hydromet.2017.06.022

Cited by 35 publications

(15 citation statements)

References 31 publications

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“…Figure 9 shows that there are obvious differences in the morphology and phase of the ASS after simulated storage. Before treatment, the ASS was flocculent particles which is similar to our previous studies [15,29], which were composed of extremely fine arsenic sulfide (Figure 2a). After simulated vacuum storage at 30 • C and 60 • C for 48 h, a small amount of crystals has been found, probably due to the oxidation of small flocculent arsenic sulfide particles (Figure 9a,b).…”

Section: Morphology Change and Phase Transformationsupporting

confidence: 87%

“…It is surprising that the results of SEM and XRD measurements show that no crystals of arsenic oxide are observed. In our previous study, the phase compositions of As were also mostly oxide (79.9%) and sulfide (10.5%) for the Cu-As-containing filter cake which was obtained by Na2S deposition [15]. This phenomenon is possibly attributed to the oxidation of arsenic sulfide during the storage period and drying process.…”

Section: Characterization and Chemical Composition Of The Assmentioning

confidence: 81%

“…This technology does not produce dust, and has the advantages of low energy consumption, low pollution, high efficiency, etc., but the process is complicated, and the processing cost is high [13]. The wet methods mainly include copper sulfate replacement method [15], sulfuric acid oxidation leaching method [16], sulfuric acid high-iron oxidation leaching method [17], nitric acid oxidation leaching method and arsenic acid leaching method [18]. In addition, studies on the recovery of arsenate by alkaline leaching and electrolysis have also been reported [11].…”

Section: Introductionmentioning

confidence: 99%

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Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage

Yao

Min

et al. 2019

Minerals

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Non-ferrous metal smelting enterprises produce hundreds of thousands of tons of arsenic sulfide sludge (ASS) each year in China. Most of the ASS are stored at the companies without enough preventive measures. During the storage and natural drying process, arsenic sulfide is easily oxidized, thereby causing secondary pollution and increasing environmental risks. In this paper, experiments of simulated storage were used to study the release characteristics of heavy metals. During the simulated storage, the release concentrations of As, Pb, and Cd increased rapidly at first and then slowly. Although the total amount of arsenic released was the largest, the release ratio was in the order of Cd > Pb > As. The effects of different atmospheres and conditions on the release of arsenic and heavy metals were explored. The more the H2SO4 in the sludge, the higher the release concentration, and the addition of an appropriate amount of Ca(OH)2 is beneficial for reducing the release of heavy metals. Finally, SEM, XRD and TG-DTG techniques were carried out to confirm that the release of heavy metals was caused by the oxidation process resulting from the residual H2SO4 in the ASS and the air.

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Section: Morphology Change and Phase Transformationsupporting

confidence: 87%

Section: Characterization and Chemical Composition Of The Assmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage

Yao

Min

et al. 2019

Minerals

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“…Earlier, the thermodynamic features of the Cu-As-S-H 2 O system were studied by Ke et al [35], demonstrating that the temperature has practically no effect on the phase composition. So, Figure 1 shows the Pourbaix diagram of the Cu-As-S-H 2 O system only at 80 • C. The concentration of Cu and As ions was 0.5 mol/dm 3 , the concentration of S ions was 1 mol/dm 3 .…”

Section: Thermodynamics Of Leaching Arsenic Trisulfide With Copper-comentioning

confidence: 98%

“…In the works of Ke et al, and Lundström et al [35,36] a method was proposed for the selective leaching of As from copper-arsenic intermediates in the presence of Cu(II) ions, based on their exchange reaction with As ions. This reaction was first described for the Nikkelverk process [35,37], which aimed at the separation of copper and nickel ions. Later it was described in the work of Lundström et al [36].…”

Section: Introductionmentioning

confidence: 99%

Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution

Karimov

Rogozhnikov

Shoppert

2019

Metals

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The overall decrease in the quality of mineral raw materials, combined with the use of arsenic-containing ores, results in large amounts of various intermediate products containing this highly toxic element. The use of hydrometallurgical technologies for these materials is complicated by the formation of multicomponent solutions and the difficulty of separating copper from arsenic. Previously, for the selective separation of As from copper–arsenic intermediates a leaching method in the presence of Cu(II) ions was proposed. This paper describes the investigation of the kinetics of arsenic sulfide-containing materials leaching by copper sulfate solution. The cakes after leaching of arsenic trisulfide with a solution of copper sulfate were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDS). The effect of temperature (70–90 °C), the initial concentration of CuSO4 (0.23–0.28 M) and the time on the As recovery into the solution was studied. The process temperature has the greatest effect on the kinetics, while an increase in copper concentration from 0.23 to 0.28 M effects an increase in As transfer into solution from 93.2% to 97.8% for 120 min of leaching. However, the shrinking core model that best fits the kinetic data suggests that the process occurs by the intra-diffusion mode with the average activation energy of 44.9 kJ/mol. Using the time-to-a-given-fraction kinetics analysis, it was determined that the leaching mechanism does not change during the reaction. The semi-empirical expression describing the reaction rate under the studied conditions can be written as follows: 1/3ln(1 − X) + [(1 − X) − 1/3 − 1] = 4560000Cu3.61e−44900/RT t.

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Arsenic Distribution and Pollution Characteristics

Wang

Chai

Yang

2019

Arsenic Pollution Control in Nonferrous Metallurgy

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Separation of Cu and As in Cu-As-containing filter cakes by Cu 2+ -assisted acid leaching

Cited by 35 publications

References 31 publications

Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage

Release Behaviors of Arsenic and Heavy Metals from Arsenic Sulfide Sludge during Simulated Storage

Leaching Kinetics of Arsenic Sulfide-Containing Materials by Copper Sulfate Solution

Arsenic Distribution and Pollution Characteristics

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