— The present investigation is focused on zinc leaching from a zinc ore followed by iron precipitation and Zn solvent extraction and stripping. The optimum …
This tutorial review describes the coordination chemistry of commercial solvent extraction processes that are used to achieve the separation and concentration of the metals of value in extractive hydrometallurgy. Hydrometallurgy, which is underpinned by coordination chemistry, is often favoured …
In order to apply the solvent extraction and separation process so developed to the real spent brass pickle liquor, a model synthetic solution containing 45 g/L H 2SO 4, 30 g/L Zn, 35 g/L Cu, 1 g ...
— Solubility plots developed on theoretical considerations for copper-oxalic acid and zinc-oxalic acid system predicted the yield of precipitates in close agreement with experimental values. 97.3% ...
— The Skorpion zinc processing method demonstrated the viability of the production of zinc from zinc oxide ores, using hydrometallurgical route including the …
— Many researchers have studied the use of D2EHPA for extraction of zinc from various aqueous solutions such as the ammonium oxalate, oxalic acid [28], sulfate [25,27, 29], and phosphoric acid ...
— Abstract This research investigates the extraction behavior of copper and zinc from the sulfate leachate of a porcelain stone tailings sample with Chemorex CP-150 and D2EHPA in detail. The findings demonstrated that Chemorex had greater ability and selectivity in the extraction of copper, while D2EHPA was better in the extraction of zinc. …
— Iron and zinc extraction remained above 99%. However, there is a slight decrease in zinc extraction (from 99.7% at pH = 2 to 99.1% at pH = 1). Finally, when the pH is lowered to 0.5, there is a significant …
— The high affinity for zinc by the phosphoric acid D2EHPA is the basis for its application in a recently ... Mixing a solution of a neutral extractant with an acidic aqueous solution can lead to protonation of the ... A. Soto, M. Soderstrom and E. Kamenetzky, 19th International Solvent Extraction Conference, Santiago, Chile, 2011. H ...
— Over the last decade, AMD waters have gained more attention as a potential source of metals due to the emerging need to recover or recycle metals from secondary resources. Metals recovery supports sustainability and the development of a circular economy with benefits for resource conservation and the environment. In this study, five …
— Separation of iron(III), copper(II) and zinc(II) from a mixed sulphate/chloride leach liquor bearing 11.8 kg/m3 iron, 24.8 kg/m3 copper, 0.23 kg/m3 zinc, 3.8 kg/m3 cobalt, 35.2 kg/m3 nickel, 176.3 ...
— Extraction experiments were carried out using an aqueous solution containing 2 g/L Cu at Gly:Cu molar ratio of 3:1 and pH 11.The different phases were allowed to attain the set temperature (15–55 °C) and then contacted at an A:O 1:1 for 15 min at the set temperatures.Results in Table 2 show that within the studied temperature …
— Solvent extraction (SX) of zinc (Zn) can be used to recover high-purity Zn from sulphide mineral leaching solutions, low-grade ores, and secondary resources. The …
to separate and recover copper and zinc. Solvent extraction of copper and zinc using Versatic 10 acid Effect of pH During extraction of metals using acidic extractants, H+ ions are released causing the decrease in pH which subsequently lowers extraction of metals in several instances. So the extraction process is greatly affected by pH.
— The sample was obtained by the oxidative leaching of copper smelter slag with sulphuric acid. Batch and continuous solvent extraction tests were carried out in glass vessel and in a mixer-settler unit from MEAB Company, Sweden (MSU-0.5) respectively. ... From a common pregnant sulphate solution, copper, cobalt and zinc have been …
Abstract: The solvent extraction of copper and zinc from the bioleaehing solutions of low-grade sulfide ores with LIX984 and D2EHPA was investigated. The influences of …
— In an earlier study on the separation of nickel and zinc ions from synthetic solutions by SX using D2EHPA and CYANEX 272, the pH range for Ni extraction was found 4.5 and 7.5, respectively.
Zn recovery attempts from a copper-free extreme Acid Mine Drainage with ~ 53 g/L Fe and ~ 2 g/L Zn revealed Fe co-extrac-tion in solvent extraction with 0.9 M D2EHPA or a mixture of 0.72 M D2EHPA and 0.18 M Cyanex 272, and simultaneous precipitation of Fe during zinc sulfide recovery through biogenic sulfide addition.
— According to Rodriguez de San Miguel et al. (1997), the selectivity of LIX 984 for copper extraction lies in the pH range 0.5–2.5.Copper extraction from the pregnant liquor was carried out in three stages with 12% v/v LIX 984 diluted with kerosene at the conditions of 25 °C, pH 2.5 and varying aqueous/organic (A/O) phase ratios.
— Zn recovery attempts from a copper-free extreme Acid Mine Drainage with ~ 53 g/L Fe and ~ 2 g/L Zn revealed Fe co-extraction in solvent extraction with 0.9 M D2EHPA or a mixture of 0.72 M D2EHPA ...
of copper, nickel and zinc from synthetic solution using LIX 984 N as the extractant dissolved in kerosene, with an aim to separate these metals efficiently by single stage extraction.
— The concept of selectively extracting copper from a low-grade dump leach solution followed by stripping the copper into an acid solution from which electrowon copper cathodes could be produced ...
— The ratio of organic to aqueous (O/A) in solvent extraction process plays important role for the extraction of metals from solutions. Therefore, the studies were made by varying O/A ratio for the extraction of copper from the aqueous feed solution containing 0.92 g/L Cu using 5% LIX 84 diluted in kerosene.The results showed the extraction of …
Solvent extraction was used to recover nickel and zinc from synthetic acidic solution. Many leaching solution and waste waters contain both zinc and nickel at the same time. Bis (2,4,4- trimethylpentyl) phosphinic acid (Cyanex 272) and Di(2-ethylhexyl) phosphoric acid (D2EHPA) were used to separate nickel and zinc. In the D2EHPA system, at equilibrium …
— 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 ...
— 1.. IntroductionDi-2-(ethyl-2-hexyl) phosphoric acid, D2EHPA was used for the first time in 1949. It has found, since then an extensive application in the field of the nuclear industry (extraction of uranium in association with tri-(n-octyl)phosphine oxide, TOPO).The D2EHPA is a viscous colourless liquid, non-miscible with water, soluble in …
— Stone coal (from Hunan province, China) was the vanadium source employed. The acidic leach solution was generated by direct leaching in 160 g/L H 2 SO 4 and 25 g/L HF solution at 90 °C, using a liquid-to-solid ratio of 2 mL/g and a reaction time of 6 h. The leach solution contained Fe(III), which has a negative influence on extraction by D2EHPA.
— ... Процесът (фигура 4) се състои от излужване на смесени медно-цинковооловни сулфидни концентрати с концентриран разтвор на амониев хлорид (6 M NH4Cl) за извличане на цветни …
— In case of the ammonium chloride solutions the extractant of 1-(3-pyridyl)nonan-1-one was used for extraction of copper(II) at pH below 6 whereas in case of acidic chloride solution the 1-(2 ...
— The extracted cadmium from the organic phase stripped effectively with 1.10 M H 2 SO 4 in two stages to produce a pure salt or metal from the purified solution. Simultaneous extraction of zinc and cadmium by a mixed solvent of D2EHPA and mono-(2-ethylhexyl) phosphoric acid (MEHPA), and the synergistic effect of MEHPA on the co …
Zn recovery attempts from a copper-free extreme Acid Mine Drainage with ~ 53 g/L Fe and ~ 2 g/L Zn revealed Fe co-extraction in solvent extraction with 0.9 M D2EHPA or a mixture of 0.72 M D2EHPA and 0.18 M Cyanex 272, and simultaneous precipitation of Fe during zinc sulfide recovery through biogenic sulfide addition. Therefore, alkalinization, solvent …
— Spent zinc electrolyte was used as the leachate and zinc concentrate was used as the reductant. The feed solution was generated by reductive leaching of the zinc residue in 190 g/L H 2 SO 4 at 90 °C, using a liquid–solid ratio of 7 mL/g, a mass ratio of zinc residue to zinc concentrate of 1:0.35, and a reaction time of 3 h. The chemical ...
— In the absence of additive (Fig. 2), the onset of Zn 2+ reduction (vs.Ag/AgCl) in Ethaline is at E = −1.18 V and the oxidation of Zn occurs via a two-stage process, with two oxidation peaks at E = −0.95 V and at −0.85 V. From careful examination of the voltammograms (Fig. s. 1 and 2) it is evident that the reduction process also occurs in …
— The studies showed the selective extraction of copper after iron precipitation from the sulfuric acid leach solution of e-wastes containing 0.92 g/L Cu and minor impurities with 2-hydroxy-5 ...
— It has been used as the extractant to recover copper from zinc leach liquor [6,8], to extract copper from sulfate media [8,20,22], to separate copper from nitrate/nitric acid media [23], to ...
The Skorpion process comprises three processing steps, atmospheric leaching in sulphuric acid, zinc solvent extraction and electrowinning to produce special high grade zinc. The …
sulfuric acid. The zinc stripping rate is above 99~ with 100 g/I. sulfuric acid, while that of iron is 0.16°//00. Hence, the separation of zinc from iron can be achieved by the selective stripping. Key words: solvent extraction; bioleaehing; copper; zinc; L]X984; D2EHPA CLC number: TF18 Document code: A
ABSTRACT. An initial test work was carried out to demonstrate that solution produced by autoclave acid leaching of Electric Arc Furnace Dust (EAFD) from the steel production …
