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Bioleaching of copper and zinc from the ore body during 10 days of processing using indigenous iron-oxidizing bacterial consortia under optimized conditions are studied. ... which in turn affect the metal extraction yield. The pH of leaching solution is an important factor in bioleaching process that controls the bacterial growth (Anders and ...
The leaching of iron (II) sulfate concentrate from Chaabet El Hamra, Algeria bulk sulphide ore with sphalerite concentrate in presence of sulfuric acid and hydrogen peroxide at low stirring rates (100 rpm). The influence of leaching temperature, leaching time, particle size and sulfuric acid concentration were studied. In this paper we focused …
To facilitate mineral liberation, wet milling was employed, reducing the d80 particle size to 138 µm in just 11 min. Shengo's dual-pronged mineral processing strategy encompassed acid leaching and flotation for ore concentration. Acid leaching experiments involved optimizing parameters such as time, temperature, and the addition of reducing ...
The leaching process of ore particles is shown in Fig. 3.1, which is generally composed of the following steps. (1) ... Effects of particle size on zinc leaching. At the alkali concentration of 6 mol/L, temperature of 90 °C, liquid-solid ratio of 10, and leaching time of 120 min, the effects of particle size on zinc leaching rate of three ...
Tank leaching establishes the most effective approach for bioleaching and > 80% of Zn is leached from zinc sulfide . 8 Factors Affecting Bioleaching Bioleaching involve microorganisms, therefore, highly effected by biological, environmental, and physicochemical factors, which in turn affect the metal extraction yield.
As can be seen from Table 2, the main minerals bearing zinc are siderite and limonite. Therefore, it can be inferred that zinc exists in gossan ores in the forms of siderite, limonite, and smithsonite. Figure 1. XRD pattern of the raw ore. Table 2. Distribution of zinc in the main minerals of the raw ore sample.
Different leaching strategies for copper, zinc, and lead have been described in the literature. Lu et al. [] obtained up to 97% copper extraction in 9-h tests from chalcopyrite concentrate in solutions containing 0.8 mol/L H 2 SO 4 and 1 mol/L NaCl at high temperatures (60–95 °C).The authors reported that chloride concentrations > 0.5 mol/L …
The Skorpion process was developed to treat a complex non-sulphide oxide ore body using atmospheric leaching followed by solvent extraction and electrowinning of zinc (1,2,3) . Sauconite is the largest contributor to the zinc grade with lesser amounts of zinc hydroxides. The gangue minerals are mainly quartz, K-feldspar and muscovite mica. The
The application of whole-ore-leaching is likely to be uneconomical, and the separation of the acid-consuming gangue minerals prior to leaching is essential to the successful recovery of zinc from these deposits. This offers numerous advantages for leaching reagent consumption, refinery sizing, and site selection, as it could prove to be ...
Before use in the leaching stage, the ZPR sample was dried, ground, and homogenized. Particle size was generally less than 50 μm. In Iranian National Lead and Zinc Co. (NILZ) has a capacity of 20,000 t Zn/y, ZnO-rich calcine is first produced from oxide-carbonate concentrates and then leached with hot H 2 SO 4 solution. After L/S …
Scholars have studied the process of increasing the leaching rate by regulating the potential. Use SO 2 to assist H 2 SO 4 leaching of zinc residues, which releases part of germanium wrapped by zinc ferrite by reducing Fe 3+. SO 2 is oxidized to sulfurous acid and further generates H 2 SO 4 [48]. However, the leaching rate of …
2.1 Materials. A zinc-bearing oxide ore containing 5.9% Zn was used for all the experiments. The feed sample was milled prior to leaching. The mineralogical properties of the ore sample were characterized by optical mineralogy methods using the polished and thin sections and scanning electron microscope (SEM) method.
During the leaching process of zinc oxidized ore, soluble zinc sulfate forms which stays in solution. In this process, the lead compounds form lead sulfate precipitates which transfer to the
The leaching of low-grade oxide zinc ore and simultaneous integrated selective extraction of zinc were investigated using a small-scale leaching column and laboratory scale box mixer-settlers. Di-2-ethylhexyl phosphoric acid (D2EHPA) dissolved in kerosene was used as an extractant. The results showed that it was possible to …
the kinetics of zinc dissolution. The results showed that the leaching of zinc is controlled by a single rate-controlling step with an activation energy of 4.458 kJ/mol before 120 min and 5.536 kJ/mol after 120 min, with zinc leaching efficiency less than 50% in all leachings. Keywords: gossan; zinc; oxide ore; leaching; alkaline treatment 1.
During leaching 99% extraction of zinc, 98% of manganese, and 96% liberation of elemental sulphur was achieved. 80–90% anodic and cathodic current efficiencies can be obtained under optimum ...
The increase in solid ore leaching residue content of iron oxide by factors of 10 and 15 is most marked. This occurs because during leaching ores iron oxide from lizardite, antigorite, actinolite, and clinochlore is transferred into sulfuric acid solutions in the form of sulfates (Fe 3 SO 4 · n H 2 O), which at pH = 3 hydrolyse with formation ...
for extracting zinc from low-grade oxide ores. Leaching zinc oxide ore by H2SO4 or HCl and its kinetics have been studied by some researchers[1−4]. Leaching low-grade zinc oxide ore consumes a great deal of acid because of existence of large amounts of basic gangue such as CaO and MgO in it. At the same time, impurities
This regime provided zinc extraction from ore into solution at the level of …
solution; and two flowsheets of direct ore leaching with ferric sulfate solution followed by a leaching-flotation step, with zinc sulfate electrolysis and other metalsrecovery in chloride leaching steps. In two last flowsheets silver is recovered during the chloride leaching steps and gold from flotation products during the cyanide leaching.
The pressure leaching of high-silica zinc oxide ore was studied by Cun-xiong et al. (2010) and He et al. (2010). They found that pressurized leaching of zinc silicate ore with sulfuric acid is a viable process that can effectively extract most of the zinc into solution and reject silica from its minerals.
The low-grade zinc oxide ore with high silica was treated through the process of sulfuric acid curing and water leaching. The ore was firstly cured for 3 h by sulfuric acid with a concentration of 55.17%H 2 SO 4 and a consumption of 1288 kg/t, and then leached using water for 3 h at 50 °C with a liquid to solid ratio of 5:1 mL/g and a stirring ...
In the present study, the impact of temperature on bacterial leaching of Zn from its sulphide ore, sphalerite, was investigated using ore adapted iron oxidizing bacteria. ... showed that Zn had a highest leaching efficiency of 89% which revealed the significant affinity of Zn on biological leaching. A Bioleaching study on lead–zinc tailing ...
Abstract. An integrated hydrometallurgical process was used for the …
The Zinc leaching process of a silicate concentrate is very similar to the sulfide concentrate. One of the differences is the acidity: for the sulfide process (after pyrometallurgical route), it can go up to 60 g/L; for the silicate it is around 10 g/L. ... This zinc ore is commercially treated and processed through a hydrometallurgical and ...
Shaimerden oxidized zinc ore containing more than 21% wt.% zinc is studied in this work. When the first research on hydrometallurgical processing of this ore was conducted the authors of this research determined the following parameters for ore leaching: the size of ore reduction, sulfuric acid concentration, temperature, and …
Abstract This paper presents the hydrometallurgical methods used for the recovery of concentrate and metallic lead from zinc plant residue (ZPR). The ZPR mainly consisting of 9.5% Pb and 7.5% Zn was initially leached by sulfuric acid under the following conditions: leaching temperature 90 °C, leaching time 90 min., sulfuric acid …
