leaching vanadium by high concentration sulfuric acid from dalian joint
Leaching vanadium by high concentration sulfuric acid …
Abstract. An effectively new technology of extracting vanadium from stone coals by high concentration sulfuric acid was researched. The effect of the …
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Leaching of vanadium from carbonaceous shale
The effect of initial sulfuric acid concentration on vanadium leaching was studied while leaching temperature, contact time, liquid to solid ratio and ammonium fluoride addition were kept constant as 95 °C, 8 h, 4:1 and 18% (mass ratio of NH 4 F to carbonaceous shale), respectively. According to the result of experiments illustrated in …
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Efficient Separation and Recovery of Vanadium, Titanium, Iron
2.2 Experiment Methods. The leaching experiments of steel slag with sulfuric acid solution were carried out at an electrically heated magnetic stirrer. 100 ml prepared sulfuric acid solution of known concentration was added to a 250-ml Erlenmeyer flask and heated to the specified temperature, and then the steel slag was added while …
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Leaching vanadium by high concentration sulfuric acid
The results show that the optimal conditions of extraction are as follows: the concentration of sulfuric acid is 6 mol/L, the ratio of liquid to solid is 3:1; the …
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Kinetics of copper extraction from copper smelting slag by …
The leaching rate of copper and iron or silicon was 97% and less than 2% respectively when copper slag is treated by oxygen pressure acid leaching process, which can achieve the purpose of limiting the leaching of Si and Fe while highly selective leaching of valuable metals under low acidity and energy consumption conditions [12], [13], [14], [15].
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Effect of microwave heating on the pressure leaching of vanadium …
The equation for direct leaching of vanadium-chromium spinel from sulfuric acid is as FeV 2 O 4 + 4H 2 SO 4 = FeSO 4 + V 2 SO 4 3 + 4H 2 O. The use of acid is not sufficient to dissociate the spinel phase and extract vanadium. A very important step is to convert the V 3+ ion in the vanadium‑chromium spinel to V 4+ or V 5+ ion. Through an ...
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Leaching of vanadium, potassium, and iron from spent …
Acid leaching involves leaching of the spent catalyst by hot acid solution in the presence of a reductant to reduce pentavalent vanadium to tetravalent vanadium, …
ادامه مطلبSelective Leaching of Vanadium from Roasted Stone …
Results showed that the leaching efficiency of V, Al, P and Fe was 80.46%, 12.24%, 0.67% and 3.12%, respectively, under the optimum dilute sulfuric acid …
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Extraction and Precipitation
In our previous tests, a direct acid leaching process using sulfuric acid and hydrofluoric acid solutions was proposed to recover vanadium from black shale and a high leaching ratio of 86% was ...
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Efficient Separation and Recovery of Vanadium(V) from Hydrochloric Acid
The acid leaching solution containing vanadium was obtained by sulfuric acid leaching or hydrochloric acid leaching, which could also contain a certain amount of metal impurity ions needing to be separated and purified. 1,17,18 At present, the solvent extraction process was a usual mature method for the separation and purification of …
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A review on the metallurgical recycling of vanadium from slags: …
The H 2 SO 4 leaching is strongly recommended for the leaching of sodium/calcium vanadate and chromate, resulting in more than 95% leaching yields of both vanadium and chromium after processing at the conditions:2.0–3.0 M H 2 SO 4 concentration, 50–70 °C temperature and leaching time of 1–3 h [50, 85, 86]. However, …
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A literature review on leaching and recovery of vanadium
The results showed that more of the CaO was likely to combine with vanadium and reacted to generate calcium vanadium which led to high leaching efficiency about …
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Recovery of Vanadium from H2SO4-HF Acidic Leaching Solution …
The recovery of vanadium from sulfuric and hydrofluoric mixed acid solutions generated by the direct leaching of black shale was investigated using solvent extraction and precipitation methods. The process consisted of reduction, solvent extraction, and stripping, followed by precipitation and calcination to yield vanadium pentoxide. The …
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Leaching of vanadium, sodium, and silicon from molten V-Ti
The water leaching process of vanadium, sodium, and silicon from molten vanadium-titanium-bearing (V-Ti-bearing) slag obtained from low-grade vanadium-bearing titanomagnetite was investigated systematically. The results show that calcium titanate, sodium aluminosilicate, sodium oxide, silicon dioxide and sodium vanadate are the major …
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Recycling of Vanadium-Containing BOF Slag with Agitation and Heap Leaching
Using a sulfuric acid leaching solution (CH 2 SO 4 = 55g/dm 3) at the temperature of 323 K, it is possible to achieve a high degree of vanadium leaching from vanadium-containing BOF slag, hitting a level of 98.5 pct. The efficiency of leaching in the percolator column largely depends on the duration of the pause between leaching.
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Leaching of vanadium and chromium from converter vanadium …
Technology intensified with surface wettability was introduced to leach vanadium and chromium from converter vanadium slag without roasting. Parameters affecting the leaching efficiency of vanadium and chromium were investigated: sulfuric acid concentration, MnO2-to-slag mass ratio, liquid-to-solid ratio, leaching time, …
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Adsorption Process of Vanadium (V) with Melamine
3.2 Effect of the Initial pH Value of the Solution. The effect of the initial pH value of the solution on the adsorption efficiency was preferentially investigated under the following conditions: reacting temperature of 90 °C, concentration of vanadium of 10 g L −1, contact time of 60 min, and molar ratio of n (melamine)/n (vanadium) = 1.0.. The …
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A green method to leach vanadium and chromium from residue …
sulfuric acid leaching: high leaching efficiency: high acid consumptionand high impurities: salt-roasting: easily leach out and high leaching efficiency ... Chen X, Lan Q, Zhang H, Ma J. Zhou. Leaching vanadium by high concentration sulfuric acid from stone coal. Tramsactions of Nonferrous Metals Society of China. 2010; 20:123–126. doi: …
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Vanadium removal from roasted LD converter slag: Optimization …
The objective of the present paper is to establish the optimum conditions (liquid to solid ratio (L/S), leaching temperature, acid concentration, stirring rate and leaching time) for recovery of vanadium from roasted LD converter slag by means of sulfuric acid leaching. Optimum conditions were determined with RSM. 2. …
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Mechanism of Extraction of Vanadium from Vanadium Slag with …
The roasted vanadium slag was milled and screened to size portion (45–74 μm). The roasted slags were leached by dilute sulfuric acid at solid/liquid ratio of 1:5. The pH of dilute sulfuric acid is 0.5. Leaching experiments were performed in a commercial magnetic stirring water bath pot with a stirring speed of 300 r/min at 70 °C for 1.5 h.
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Highly efficient separation and extraction of vanadium from a multi
The vanadium concentration was determined by ferrous ammonium sulfate titration using N-phenylanthranilic acid as indicator [31], [32], while the concentration of other ions present in the solution was analyzed by inductively coupled plasma–optical emission spectroscopy (ICP–OES, Optima 4300DV, Perkin–Elmer Ltd., USA).The pH of …
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The kinetics of oxidative leaching of vanadium xide
The oxidative leaching of vanadium xide was studied in sulfuric acid solutions from 30 °C to 90 °C. This study was performed in three stages. First, the kinetics of leaching using oxygen was investigated. It was shown that this oxidative leaching is chemically-controlled with an activation energy of around 69 kJ/mol. Secondly, …
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Selective leaching of vanadium from chromium residue intensified …
Leaching vanadium by high concentration sulfuric acid from stone coal. Trans. Nonferrous Met. Soc. China (2010) K. Mazurek ... Under the optimal cyclic leaching conditions (acid concentration 3.0 mol/L, liquid: solid ratio 4: 1, temperature 90 °C, and leaching time 100 h), the leaching rate of vanadium reached 80.28%, while the …
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Recovery of vanadium from vanadium slag by composite roasting …
Comparison of ion exchange and solvent extraction in recovering vanadium from sulfuric acid leach solutions of stone coal [J] ... Leaching kinetics of calcification roasted vanadium slag with high CaO content by sulfuric acid [J] International Journal of Mineral Processing, 133 (2014), pp. 105-111.
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Leaching of vanadium from stone coal with sulfuric …
The results show that the vanadium leaching ratio of roasted stone coal through two-stage counter-current leaching can reach 65.1% at the mass ratio of H2SO4 to stone coal of …
ادامه مطلبA synergistic approach for separating vanadium and
Introduction. The separation and recovery of vanadium has drawn increasing attention due to the ever-creasing demand for V 2 O 5 and its compounds [1], [2]. Various resources bearing vanadium such as vanadium-titanium magnetite, black shale, fly ash, spent catalysts and Bayer's sludge are usually used in a sulfuric leaching process, …
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Study on Vanadium Recovery from Spent Catalyst Used in …
leaching stage was used to obtain high concentration of vanadium pent oxide and low acid consumption that allowed direct precipitation without the use of extraction by rather expensive organic solvents. Sodium carbonate solution of one mole/liter concentration was used in the precipitation stage. Sulfuric acid was found to be the best leaching ...
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Extracting Vanadium over Iron from Direct Acid Leaching Solution …
Through a 4-stage countercurrent extraction under the following optimum conditions: TOA concentration of 15 vol.%, initial aqueous phase pH of 1.8~1.9, phase …
ادامه مطلبSelective extraction of vanadium from pre-oxidized vanadium slag …
Most of the vanadium (V) is industrially extracted from vanadium slag, a byproduct in steelmaking, via the sodium roasting-water leaching or calcification roasting-acid leaching process, which usually suffers from environment pollution or decrease in product purity. In this paper, a novel process of vanadium extraction featuring …
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Optimization and kinetic analysis of direct acid leaching …
Comprehensive taking into the acid consumption, the erosion to the equipment and the leaching efficiency of vanadium, the following condition was selected: sulfuric …
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