Temat: atmospheric leaching

Skocz do pozycji: 1.

Tytuł:: Chloride leaching of silver and lead from a solid residue after atmospheric leaching of flotation copper concentrates
Autorzy:: Chmielewski, T.
Gibas, K.
Borowski, K.
Adamski, Z.
Wozniak, B.
Muszer, A,
Tematy:: copper concentrate
atmospheric leaching
chloride leaching
silver
lead; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109629.pdf Link otwiera się w nowym oknie
Opis:: Recovery of silver and lead by means of chloride leaching of solid residue after atmospheric leaching of the copper concentrate from Lubin Concentrator (KGHM) was investigated. The effect of leaching temperature, chloride concentration, Fe(III) and oxygen presence, solid-to-liquid ratio and feed preleaching with NaOH on the silver and lead recovery was analyzed. Chloride leaching appeared to be very effective for recovery of lead, whereas satisfactory recovery of silver was observed after chemical pretreatment of the leaching feed with alkali solution of NaOH in order to liberate Ag entrapped in the jarosite structure. It was found that to achieve the satisfactory recovery of Ag and Pb leaching had to be performed in acidified 4 M chloride concentration at temperature of 90 oC. The presence of oxidants, that is O2 and iron(III) ions, was beneficial in the initial stage of the process. The maximum recovery of Ag and Pb was found for the solid-to-liquid ratio of 1:10 after 10 hours leaching.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Recovery of cobalt and nickel by atmospheric leaching of flotation sulfide concentrate from lubin concentrator
Autorzy:: Gibas, K.
Borowski, K.
Chmielewski, T.
Wejman, K.
Tematy:: atmospheric leaching
cobalt
nickel
sulphuric acid
Lubin copper concentrate; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/951849.pdf Link otwiera się w nowym oknie
Opis:: An experimental study on leaching of cobalt and nickel from a Lubin (Poland) sulfide flotation copper concentrate with oxygenated sulphuric acid solution in the presence of iron(III) sulfate is presented. The effect of temperature, iron(III) concentration, initial sulphuric acid concentration, oxygen flow rate and chloride ions addition on cobalt and nickel leaching were examined. The obtained results show, that enhancing investigated leaching parameters increases both the rate and leaching recovery of nickel and cobalt. The effect of iron(III) ions concentration is particularly significant. Additionally, a significant correlation between copper and nickel/cobalt leaching recovery was observed. Due to the fine dissemination of nickel and cobalt, they were leached remarkably faster when copper leaching recovery exceeded 90%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Thiosulfate leaching of silver from a solid residue after pressure leaching of industrial copper sulfides flotation concentrates
Autorzy:: Wejman-Gibas, K.
Chmielewski, T.
Borowski, K.
Gibas, K.
Jeziorek, M.
Wodka, J.
Tematy:: atmospheric leaching
silver
sodium thiosulfate
ammonia
Lubin copper concentrate; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109947.pdf Link otwiera się w nowym oknie
Opis:: Hydrometallurgical recovery of silver from a solid residue after pressure leaching of a flotation copper concentrate from the Lubin Concentrator (KGHM Polska Miedz S.A.) was investigated. Thiosulphate leaching was examined with regard to the highest possible leaching efficiency and optimization process parameters. The effect of thiosulfate ions concentration within the range from 0.25 to 1.00 mol/dm3 at a constant ammonia concentration, and ammonia concentration within the range from 0.40 to 1.00 mol/dm3 at a constant thiosulfate concentration on leaching recovery of selected metals were examined. Moreover, the effect of copper(II) ions addition on silver leaching was studied. It was shown that the leaching recovery of silver increased with increasing thiosulfate and ammonia concentration. At the highest thiosulfate ions concentration, the observed silver leaching recovery was 60%. The best results were obtained at an ammonia concentration of 0.80 mol/dm3, where the leaching recovery of Ag reached 75%. It was established that addition of Cu(II) did not affect silver leaching. Nearly 100% efficiency of thioslulohate silver leaching was achieved by pretreatment of the solid residue after pressure leaching with NaOH solutions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Leaching behaviour of limonite ores from Lapaopao, Southeast Sulawesi, Indonesia : Effect of mineralogy and acid types
Autorzy:: Onggang, Suharto
Maulana, Adi
Sufriadin, Sufriadin
Irfan, Ulva Ria
Tematy:: limonite ore
atmospheric leaching
hydrochloric acid
nitric acid
sulfuric acid; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/58971174.pdf Link otwiera się w nowym oknie
Opis:: An atmospheric leaching study of limonite ores from Lapaopao, Southeast Sulawesi, using hydrochloric acid (HCl), nitric acid (HNO3), and sulfuric acid (H2SO4) has been performed. The objectives of this study were to analyze the effect of ore mineralogy and acid types on the dissolution behavior of minerals and the leaching rate of Ni and Co at atmospheric pressure conditions. Mineralogical analysis was carried out using optical microscopy, scanning electron microscopy (SEM), and X-ray diffractometry (XRD), while the ore's chemical composition was determined by using X-ray fluorescence spectrometry (XRF) and atomic absorption spectrophotometry (AAS). Mineralogically, the limonite ores are dominated by goethite, followed by gibbsite, talc, and lizardite, with less amounts of hematite and quartz. Analysis results of solid residues revealed that mineral dissolution order was determined as follows: goethite > lizardite > gibbsite> hematite > talc> quartz. The results of the leaching experiment exhibited that the order of leaching rates of Ni in the three ores samples using three different acids were found as follows: Ore-1 > Ore-2 > Ore-3. Comparison of HCl, HNO3, and H2SO4 as the lixiviants for the leaching of limonite ores demonstrated that HCl was the most reactive acid, followed by HNO3 and then H2SO4. This might be due to the differences in mineralogical nature and reactivities of acids during the leaching process.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Carrollite Leaching in H2SO4-NaClO3 Media at Atmospheric Pressure
Autorzy:: Dong, Bo
Wu, Jian-Hui
Wu, Jun
Zhang, Xian-Peng
Zhai, Jing-Jun
Tematy:: CuCo2S4
atmospheric leaching
H2SO4-NaClO3 media; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352763.pdf Link otwiera się w nowym oknie
Opis:: A new extraction process suitable for treating refractory CuCo₂S₄ under atmospheric pressure acidic leaching conditions was investigated. The effect of variables such as oxidant species, liquid-to-solid ratio, leaching time, oxidizing agent and mineral quality ratio, H₂SO₄ concentration, temperature and sodium chloride concentration on the extraction efficiency of Co, Cu and Fe from CuCo₂S₄ were investigated. Under optimal conditions including P₈₀-P₉₀ of the sample was d < 0.0074 mm, stirring speed of 400 rpm, leaching time of 8 h with sodium chlorate (NaClO₃) and mineral quality ratio of 0.5, 2 mol/L H₂SO₄, liquid-to-solid ratio of 7, leaching temperature of 90°C and 4 mol/L sodium chloride. The leaching efficiency of Co, Cu, and Fe were nearly 97.08%, 100%, and 92.45%, respectively. Furthermore, the contents of cobalt and copper in leaching residue were all less than 0.4 wt.%, which satisfies the requirements of industrial production.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Extraction of titanium from Ti-doped seaside magnetite concentrate in HCl media
Ekstrakcja tytanu z nadmorskiego koncentratu magnetytu domieszkowanego tytanem w środowisku HCl
Autorzy:: Kart, Elif Uzun
Kırman, Mümin
Tematy:: seaside magnetite concentrate
atmospheric HCl leaching
titanium extraction
nadmorski koncentrat magnetytu
ługowanie
warunki atmosferyczne HCl
ekstrakcja tytanu; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Powiązania:: https://bibliotekanauki.pl/articles/2069763.pdf Link otwiera się w nowym oknie
Opis:: The purpose of the present study was to extract high added value titanium from Ti-doped Seaside Magnetite Concentrated (Ti-SMC), which has a high potential reserve for Ti-Fe with 4–6% Ti, 50–52% F e, 1–2% Al, and 1–2% Mg content by applying innovative, economical, environmentally friendly methods. A gitaion HCl leaching was applied to the Ti-SMC sample at different leaching temperatures (25–50–75–90°C), at acid concentrations (8–10–12 N ), and leaching times (30–60–120–240 min) in atmospheric conditions. After the leaching experiments under the indicated conditions, the optimization of the leaching experiments was determined with Ti% recovery that dissoluted by elemental analysis, and the titanium recovery values reached the maximum value with increased leaching time at 50°C and 10 N HCl acid concentration; and 65% Ti was recovered in 30 minutes, 67% in 60 minutes, 74% in 120 minutes, and 82% Ti in 240 minutes. For Ti-SMC, leaching was carried out at 50°C leaching temperature and at 10 N acid concentration for 480 minutes, and a 92% Ti extraction value was achieved. According to the extraction results of all leaching experiments, the leaching temperature of 50°C, the acid concentration of 10 N , and the leaching time of 480 minutes were determined as the optimum conditions. In this study, it was emphasized that this resource is a potential reserve, which has not been used as a source before, with 92% Ti extraction with atmospheric acid leaching, which is an environmentally friendly method, consuming less energy than Ti-SMC, which is difficult and expensive to extract with traditional methods.
Celem badań była ekstrakcja tytanu z nadmorskiego koncentratu magnetytu (Ti-SMC–Ti-doped Seaside Magnetite Concentrated), charakteryzującego się znacznym potencjałem rudy Ti-Fe zawierającej 4–6% Ti, 50–52% F e, 1–2% Al oraz 1–2% Mg, dzięki zastosowaniu innowacyjnych, ekonomicznych i przyjaznych dla środowiska metod ługowania. Ługowanie kwasem solnym HCl z mieszaniem zastosowano do próbek Ti-SMC w różnych temperaturach ługowania (25–50–75–90°C), przy stężeniach kwasu (8–10–12 N) i czasach ługowania (30–60–120–240 min) w warunkach atmosferycznych. Następnie dokonano optymalizacji eksperymentów ługowania z odzyskiem Ti%. Maksymalne wartości odzysku tytanu wystąpiły przy zwiększonym czasie ługowania w temperaturze 50°C i stężeniu kwasu solnego HCl 10 N; 65% Ti odzyskano w ciągu 30 min, 67% – w 60 minut, 74% – w 120 minut, a 82% – w 240 minut. W przypadku Ti-SMC ługowanie prowadzono w temperaturze 50°C i przy stężeniu kwasu 10 N przez 480 minut i otrzymano wartość ekstrakcji 92% Ti. Zgodnie z wynikami ekstrakcji we wszystkich eksperymentach ługowania jako optymalne warunki określono: temperaturę ługowania 50°C, stężenie kwasu 10 N i czas ługowania 480 minut. W pracy podkreślono, że surowiec ten stanowi potencjalną rezerwą, wcześniej niewykorzystywaną. Ekstrakcja 92% Ti z ługowaniem kwasem solnym w warunkach atmosferycznych jest metodą przyjazną dla środowiska, zużywającą mniej energii niż Ti-SMC, która jest trudna i droga do ekstrakcji tradycyjnymi metodami.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Effect of deforestation on stream water chemistry in the Skrzyczne massif (the Beskid Ślaski Mountains in southern Poland)
Autorzy:: Małek, Stanisław
Kosmowska, Amanda
Żelazny, Mirosław
Jelonkiewicz, Łukasz
Siwek, Joanna
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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