Selective leaching of arsenic and antimony from a tetrahedrite rich complex sulphide concentrate using alkaline sulphide solution

Awe, Samuel Ayowole; Sandström, Åke

doi:10.1016/j.mineng.2010.08.018

Cited by 91 publications

(35 citation statements)

References 23 publications

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“…To investigate the effects of grinding, a comparison in the crystalline phase using XRD analysis was carried out for original and ground samples after grinding for 1 h to 12 h. Figure 4 shows the resultant XRD profiles. In the original sample, crystalline minerals including As, tennantite (Cu,Fe) 12 As 4 S 13 , and minerals such as chalcopyrite CuFeS 2 , enargite Cu 3 AsS 4 , pyrite FeS 2 , and quartz SiO 2 , were identified. Although the crystallinity of these minerals was reduced via the grinding treatment, there were no new crystalline mineral phases observed.…”

Section: Mechanochemical Effectmentioning

confidence: 99%

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Mechanochemical Treatment to Remove Arsenic from Copper Ore

2019

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This study tested the removal of arsenic from copper ore concentrate via a mechanochemical treatment by planetary ball milling. The harmful components of ore, such as arsenic, are increasing year by year and decreasing the copper grade, therefore there is a strong need to improve the separation of arsenic from copper ore. The effect of grinding as a result of chemical activation caused by mechanochemical treatment was evaluated by XRD and X-ray absorption spectroscopy (XAS) measurements. From the results of the XRD analysis, several crystalline minerals were identified from the original samples. The diffraction peaks of the original samples were reduced by grinding, although grinding did not generate any new diffraction peaks. The comparison of the results of grinding in dry and wet conditions showed that the rate of disappearance of the crystalline minerals was faster in dry grinding than in wet grinding. To clarify the chemical state of arsenic in copper ore, XAS analysis was carried out. The results indicated that the arsenic compound changed from sulfide, in the original sample, to oxide after grinding. As a result of oxidation, the arsenic was easy to dissolve in a water and alkaline solution, and optimized dry and wet grinding conditions achieved up to 76% arsenic removal efficiency.

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Section: Mechanochemical Effectmentioning

confidence: 99%

“…Their study indicated that sulfuric acid could achieve a high leaching efficiency. Liu et al studied the leaching process of arsenic in a sulfide system and showed that the high arsenic leaching rate might be obtained by high consumption of sulfide and alkali [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Treatment to Remove Arsenic from Copper Ore

2019

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“…Therefore, hydrometallurgical methods are preferred as they have better potential. These methods in- clude pressure oxidation [7,8], biological oxidation [9][10][11], and nitric acid oxidation [12].…”

Section: Hypochlorite As Oxidizing Mediummentioning

confidence: 99%

Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium Hypochlorite, Followed by Extraction of Gold by Pressure Cyanidation, on Gold Removal

Valenzuela¹,

Valenzuela²,

Parga³

2013

ACES

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The majority of the refractory gold and silver occurs in occlusion in sulphides, then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite-sodium-hydroxide solution followed of pressure cyanidation of the oxidized concentrate, for the extraction of precious metals. This process was conducted and evaluated under cyanide and oxygen pressure. This versatile approach offers many advantages, including low temperatures, low pressure and less costly materials of construction than conventional pressure oxidation. In this study, the effect of oxygen pressure, concentration of sodium hypochlorite, temperature, and initial pH, in precious metals recovery and As removal were evaluated using a 2 4 factorial design. Characterization of the ores showed that pyrite and arsenopyrite were the main minerals present on the concentrate. The best results for gold extraction were obtained with oxygen pressure of 80 psi, 10% (w/w) sodium hypochlorite, temperature of 80˚C, at pH = 13, and a constant stirring speed of 600 rpm. These conditions allowed an approximated 60% of gold and 90% of silver extractions in 1 hr.

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“…Samuel a. Awe [12][13] investigated recovering metallic antimony from the copper and sulfur concentrate containing antimony by selective leaching in alkaline sulphide solution. Yang [14] investigated separation and recovery of Sb from stibnite using SbCl 5 -HCl as a leaching reagent and it was regenerated by electrowinning.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetics analysis of the sulfur-fixed roasting of antimony sulfide using ZnO as sulfur-fixing agent

Ouyang

Chen

Tian

et al. 2018

J min metall B Metall

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Currently, the commercial antimony metallurgy is mainly based on pyrometallurgical processes and oxidative volatilization of Sb 2 S 3 is an essential step. This step includes the problems of high energy consumption and low concentration of SO 2 pollution. Aiming at these problems, we present a new method of sulfur-fixing roasting of antimony sulfide. This method uses ZnO as a sulfur-fixing agent, and roasting with Sb 2 S 3 was carried out at 673 K~1073 K to produce Sb 2 O 3 and ZnS. By calculating the thermodynamics of the reactions, we can conclude that the Gibbs Free Energy Change (ΔG θ ) of roasting reaction is below -60 kJ/mol and the predominance areas of Sb 2 O 3 and ZnS are wide and right shifting with the temperature increase, which all indicates that this method is theoretically feasible. The reacted products between Sb 2 S 3 and ZnO indicated that the reaction began at 773 K and finished approximately at 973K. We used the Ozawa-Flynn-Wall, Kissinger and Coats-Redfern method to calculate the kinetics of the roasting reaction. The conclusion is as follows: The average values of apparent activation energy (E) and natural logarithmic frequency factor (lnA) calculated by Ozawa-Flynn-Wall, Kissinger and Coats-Redfern were 189.72 kJ·mol -1 and 35.29 s -1 , respectively. The mechanism of this reaction was phase boundary reaction model . The kinetic equation is shown as follow, where α represents reaction fraction:

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Selective leaching of arsenic and antimony from a tetrahedrite rich complex sulphide concentrate using alkaline sulphide solution

Cited by 91 publications

References 23 publications

Mechanochemical Treatment to Remove Arsenic from Copper Ore

Mechanochemical Treatment to Remove Arsenic from Copper Ore

Effect of Pretreatment of Sulfide Refractory Concentrate with Sodium Hypochlorite, Followed by Extraction of Gold by Pressure Cyanidation, on Gold Removal

Thermodynamic and kinetics analysis of the sulfur-fixed roasting of antimony sulfide using ZnO as sulfur-fixing agent

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