Direct Leaching of Low-Grade Zinc Oxide Ore Containing High Amounts of Iron and Manganese

Soltani, Faraz; Aram, Reza; Aazami, Mokhtar; Darabi, Hossna; Ghadiri, Mahdi; Chegeni, Mohsen Hemmati; Shirazian, Saeed

doi:10.1007/s12666-019-01635-x

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…Abdel-Aal 37 showed that the enhancement of the temperature from 40 to 70 °C, the Zn leaching efficiency increased from 70 to about 95%. Previous work conducted by the authors showed that increasing the temperature above 45 °C, increases the leaching efficiency of impurities 5 . Therefore, during the leaching experiments, the temperature was set at 45 °C.…”

Section: Resultsmentioning

confidence: 91%

“…In addition, the leaching temperature was set at 45 °C to minimize the leaching efficiency of impurities. The effect of particle size and temperature have been studied in another study by the authors 5 .…”

Section: Resultsmentioning

confidence: 99%

“…The leaching tests were conducted in a stirred-tank reactor by H 2 SO 4 and de-ionized water as leaching solution with agitation rate of 500 rpm, pH of less than 2 and particle size (d 80 ) of 300 µm 5 . In each test, the amount of 100 g ore was added into the reactor and temperature was set at the desired temperature, then the leaching was performed for 2 h. The pH of solution was measured every 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…4 Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam. 5 The Faculty of Environment and Chemical Engineering, Duy Tan University, Da Nang 550000, Viet Nam. * email: mahdighadiri@duytan.edu.vn processes, iron can be removed from the leaching solution in the form of hematite, goethite and various types of Jarosite [20][21][22] .…”

Section: Openmentioning

confidence: 99%

“…The importance of zinc oxide ores processing such as carbonate and silicates minerals have increased because of the depletion of zinc sulphide ores and the restriction on sulphur emissions during their processing [1][2][3][4][5][6] . The zinc oxide ores usually contain several different minerals including zincite (ZnO), smithsonite (ZnCO 3 ), hydrozincite (2ZnCO 3 •3Zn(OH)), hemimorphite (Zn 4 Si 2 O 7 (OH) 2 •H 2 O), and willemite (Zn 2 SiO 4 ) 2 .…”

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confidence: 99%

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Leaching and solvent extraction purification of zinc from Mehdiabad complex oxide ore

Soltani

Darabi

Aram

et al. 2021

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An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were hemimorphite, willemite, and calcophanite. Main gangue minerals were quartz, goethite, hematite, and calcite. Central composite design (CCD) method was used to design leaching experiments and the optimum conditions were found as follows: 30% of solid fraction, 22.05% sulphuric acid concentration, and the leaching temperature of 45 °C. The PLS containing 35.07 g/L zinc, 3.16 g/L iron, and 4.58 g/L manganese impurities was produced. A special purification process including Fe precipitation and Zn solvent extraction was implemented. The results showed that after precipitation of iron, Zn extraction of 88.5% was obtained with the 2 stages extraction system composed of 30 vol% D2EHPA as extractant. The overall Zn recovery from the ore was 71.44%. Therefore, an appropriate solution containing 16.6 g/L Zn, 0.05 g/L Fe, and 0.11 g/L Mn was prepared for the electro-winning unit without using the roasting and calcination steps (conventional method), which result in environmental pollution.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%