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For each experiment, 40 mL of various sulfuric acid solutions of 0.4–2.0 M and 10 g of ore sample were employed to dissolve the copper and iron incorporated in the malachite ore. Then, the impure copper solution was treated with hydrogen peroxide (H 2 O 2 ) to ensure that all iron (II) ions were converted to iron (III).
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An interesting practical application is the regeneration ceramic filter media used in iron ore processes by acidic dissolution . Moreover, ... Oxalic acid, however, can improve the dissolution rate and solubility level of iron oxides in sulfuric acid [13,14,15]. Therefore, it is hypothesized that the addition of oxalic acid to nitric acid can ...
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AAL was performed with an operating temperature of 95 °C, an operating time of 5 hours, an ore-to-solvent ratio of 0.05 g/ml, a particle size of ± 200 mesh, and sulfuric acid concentration ...
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Sulfuric acid is very reactive and dissolves most metals, it is a concentrated acid that oxidizes, dehydrates, or sulfonates most organic compounds, often causes charring. …
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It was shown, that natural α-modification practically does not interact with salts and it is difficult to decompose with sulfuric acid; lithium extraction reaches 90–95% only with ultrafine grinding of the concentrate (1–4 μm) and at the pressure of 50–70 atm (250–280 °C) and sulfuric acid consumption up to 65–85%wt. (Morozova et ...
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19 hours agoThe sulfide-bearing ore can release harmful pollutants including sulfuric acid and heavy metals when exposed to water and air. Talon Metals is a joint venture …
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A 97.43% leaching ratio of manganese was obtained from the roasted ore, which was leached by a 1.5 mol/L concentration of sulfuric acid at a 50°C leaching temperature, 50 rpm stirring speed and a ...
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Ore from the mine is subjected to four stages of crushing to a P 80 of 8 mm followed by agglomeration with bacteria and sulfuric acid, stacking of the agglomerates to form heaps and leaching of the heaps with a sulfuric acid solution at pH 1.8 (Crundwell et al. Citation 2011b; Riekkola-Vanhanen Citation 2007, Citation 2013; Watling Citation 2008).
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Cadmium metal produced in the purification of zinc electrowinning electrolyte is dissolved in sulfuric acid solution and electrowon in a process similar to that for zinc. About 60% of the world 2009 nickel production of 1.4 million tonnes was derived from sulfide ores, but an ever-increasing proportion is coming from other ores (such as ...
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Sulfuric acid curing is a pretreatment to accelerate the extraction kinetics of copper ores and is widely used in copper operations. The curing process involves the addition of a highly concentrated sulfuric acid to the copper ore during agglomeration. Then, chemical reactions already begin prior to
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X-Ray Diffraction analysis showed that the manganese ore was consisted of pyrolusite (MnO 2), rhodonite (MnSiO 3), rhodochrosite (MnCO 3) and hematite (Fe 2 O 3). Manganese ore was also analyzed by thermal analysis to observe their thermal decomposition character. In this study, sulphuric acid (H 2 SO 4, 6 M) was deployed
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In the process of sulfuric acid curing-leaching vanadium-bearing stone coal, the curing effect is very important. The main purpose of this study is to capture the difference in the curing effect between coarse and fine stone coal, with a V2O5 content of 0.88%. In this work, the effects of various factors such as sulfuric acid concentration, curing time, …
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The recovery and leaching kinetics of lithium from lepidolite by sulfuric acid method were investigated in this study, and a new method of nanofiltration to separate Al/Li from lepidolite leaching solution was coupled. The results indicated the optimal conditions about leaching lithium from lepidolite: leaching at 433 K for 4 h with the …
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The dissolution of iron oxides in mixtures of acids is fairly uncommon but can result in a more efficient dissolution process. The objective in this work was to investigate the dissolution of synthetic hematite powder in mixtures of oxalic and sulfuric acid. Experiments were done at different acid ratios and temperatures. An increase in …
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3.2.2. Effect of the sulfuric acid concentration. Based on eqn (6)–(9), the theoretical consumption of sulfuric acid for the leaching of CaO, CuO, and Fe 2 SiO 4 from the copper tailings is about 0.53 mol L −1 at a S/L ratio of 1: 10. Thus, the effect of the sulfuric acid concentration was investigated in the range of 0.31–0.64 mol L −1.
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The sulfuric acid process has a wide adaptability to raw material, also including zinnwaldite, petalite, and ores with only 1.0% –1.5% lithium oxide (Martin G et al., 2017a; Sitando O and Crouse PL, 2012), but its disadvantage is that the consumption of sulfuric acid is large, and sodium carbonate becomes low-value sodium sulfate (Peng …
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Sulfuric acid is used in the following industries: fertilizer, petro-leum refining, mining and metallurgy, ore processing, inorganic and organic chemicals, synthetic rubber and plastics, pulp and paper, soap and detergents, water treatment, cellulose fibers and films, and inor-
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The leaching kinetics study shows that nickel extraction from limonite ore by a mixture of 2 M sulfuric acid and 0.5 M citric acids is controlled by diffusion through solid product layer, while the nickel extraction from saprolite ore by a mixture of 0.5 M sulfuric acid and 2 M citric acid is controlled by interface reaction with activation ...
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Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about pH 1.5. Sulfuric acid leaching circuits commonly employ either
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It involves the HL of the ore by dilute sulfuric acid at ambient temperature, purification of the leach liquor, and recovery of nickel and cobalt by electrowinning. 3.4 …
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3.2.2. Effect of the sulfuric acid concentration. Based on eqn (6)–(9), the theoretical consumption of sulfuric acid for the leaching of CaO, CuO, and Fe 2 SiO 4 from the …
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1 Silk Touch Ore + Sulfuric Acid → Chemical Dissolution Chamber → Ore Slurry. Ore Slurry + Water → Chemical Washer → Clean Ore Slurry → Chemical Crystalizer → Crystals. Crystals are then put into a Tier 3 setup to be processed. You need a chain to make Hydrogen Chloride the same as Tier 3. You also need a source of Gravel/Flint ...
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A series of experiments were carried out by varying the ratio of sulfuric acid to ore from 0.25 (1:4 ratio) to 1.25 (5:4 ratio). The samples were roasted for 1 h at a fixed temperature of 600 °C. After roasting, the samples were leached with water at 80 °C and a liquid-to-solid ratio of 2:1 (mL/g) for 1 h with agitation. ...
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It involves the HL of the ore by dilute sulfuric acid at ambient temperature, purification of the leach liquor, and recovery of nickel and cobalt by electrowinning. 3.4 High–Pressure Sulfuric Acid Leaching. As shown in Fig. 10, HPAL requires a 30–50 bar pressure and a temperature of 240-270 °C . The grounded ore slurry is thickened before ...
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In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity …
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Hence, the experimental results showed that the sulfuric acid passivation pretreatment could selectively increase the difference in the floatability of galena and chalcopyrite, which is a potential method to realize the efficient separation of copper-lead sulfide ores. 3.2. The influence of sulfuric acid passivation on single mineral contact angle
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An alternative laterite nickel ore processing using sulfuric acid as a leaching agent to produce class 1 nickel as a raw material for electric vehicle batteries produces natrojarosite residue as a by-product …
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coking plants by 35 companies at 90 plants in 26 States. Byproduct sulfuric acid, representing about 7% of production of sulfur in all forms, was recovered at five nonferrous-metal smelters in four States by four companies. Domestic elemental sulfur provided 59% of domestic consumption, and byproduct sulfuric acid accounted for about 5%. The
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The zinc minerals in the ore were hemimorphite, willemite, and calcophanite. Main gangue minerals were quartz, goethite, hematite, and calcite. ... Abdel-Aal, E. A. Kinetics of sulfuric acid ...
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