Journal ArticleDOI
Determination of the Optimum Conditions for Leaching of Malachite Ore in H2SO4 Solutions
TLDR
In this paper, the Taguchi method has been used to determine the optimum conditions for the dissolution of malachite ore in H2SO4 solutions, and the chosen experimental parameters and their range were (i) reaction temperature: 15 to 45 °C, (ii) solid-to-liquid ratio: 1/10 to 1/3 g cm-3, (iii) acid concentration (in weight): 2 % to 10 %, particle size: –40 to 3.5 mesh, (iv) stirring speed: 240 to 720 rpm, and (vi) reaction timeAbstract:
The Taguchi method has been used to determine the optimum conditions for the dissolution of malachite ore in H2SO4 solutions. The chosen experimental parameters and their range were (i) reaction temperature: 15 to 45 °C, (ii) solid-to-liquid ratio: 1/10 to 1/3 g cm–3, (iii) acid concentration (in weight): 2 % to 10 %, (iv) particle size: –40 to –3.5 mesh, (v) stirring speed: 240 to 720 rpm, and (vi) reaction time: 5 to 45 minutes. The optimum conditions were found to be reaction temperature: 40 °C, solid-to-liquid ratio: 1/3 g cm–3, acid concentration (in weight): 10 %, particle size: –30 mesh, stirring speed: 480 rpm, and reaction time: 45 minutes. Under these optimum working conditions, the dissolution of copper and iron in malachite ore was 100 % and 58 %, respectively. Besides, alternative working conditions reducing the total cost and dissolution of iron were found.read more
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Leaching of copper oxide with different acid solutions
TL;DR: In this article, the dissolution of CuO in HCl, H 2 SO 4, HNO 3 and citric acid solutions was investigated in a batch reactor employing parameters expected to affect the dissolution rate of copper such as stirring speed, temperature and acid concentration.
Journal ArticleDOI
Dissolution kinetics of malachite in ammonia/ammonium carbonate leaching
TL;DR: In this paper, the effect of leaching time, ammonium hydroxide, and ammonium carbonate concentration, pH, [NH3]/[NH4+] ratio, stirring speed, solid/liquid ratio, particle size, and temperature were investigated.
Journal ArticleDOI
Dissolution kinetics of malachite in sulphuric acid
Deniz Bingöl,M. Canbazoglu +1 more
TL;DR: In this article, a kinetic study of the sulphuric acid leaching of oxidised copper ore, primarily malachite, was carried out and the effects of leaching time, stirring speed, acid concentration, solid to liquid ratio, reaction temperature, and particle size of the ore were investigated.
Journal ArticleDOI
An investigation into the leaching behaviour of copper oxide minerals in aqueous alkaline glycine solutions
TL;DR: In this paper, an alternative aqueous alkaline glycine system has been employed to evaluate the batch leaching behaviour of copper oxide mineral specimens of the minerals azurite, chrysocolla, cuprite and malachite.
Journal ArticleDOI
Galvanic Leaching of Chalcopyrite in Atmospheric Pressure and Sulfate Media: Kinetic and Surface Studies
TL;DR: In this paper, pyrite is used as a catalyst of chalcopyrite leaching, and the results showed that maximum copper recovery (more than 95%) is obtained in less than 24 hours, stirring speed of 1150 rpm, pyritic to chal copyrite ratio 4, solution potential 410 mV, temperature 85 °C, and initial sulfuric acid concentration 45 g/L.