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Acid Leaching of Vanadium from a Vanadium Residue

A process has been developed at the laboratory scale for leaching of vanadium from a vanadium residue using mixed hydrofluoric and sulfuric acid solutions, and NaClO as an oxidant. The extraction studies were carried out using various acid concentrations, liquid/solid ratios, addition of oxidant, reaction temperatures and leaching times.

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Recovery of Valuable Metals with Citric Acid from Red Mud

acid leaching (Zhu et al., 2011; Song et al., 2012; Wang and Li, 2012). The present research work is to investigate ... Fig. 3, respectively under the condition of liquid to solid ratio of 5 mL/g, temperature of 90 oC and reaction time of 60 min. Fig. 2.

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Acetic acid mediated leaching of metals from leadfree solders

In the first set, a gradual increase in metal leaching was observed with an increase in acid concentration approaching complete metal leaching at an acid concentration 80%. It is worthy to note that 68 (± ) and 70 (± ) % metal leaching was obtained for Cu and Sn, respectively, at 10% acid …

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Sustainable recovery of valuable metals from spent lithium ...

The leaching efficiencies of Li, Co, Ni, and Mn can reach about %, %, %, and %, respectively, under the leaching conditions of DLmalic acid concentration of M, hydrogen peroxide content of vol.%, solidtoliquid ratio of 40 g l1, leaching temperature of 80°C, and

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Selective Leaching of Vanadium from Roasted Stone Coal by ...

the leaching efficiency of V, Al, P and Fe was %, %, % and %, respectively, under the optimum dilute sulfuric acid dephosphorization (DSAD)twostage pressure acid leaching (PAL) conditions. The efficient separation of V from Fe, Al and P was realized. As apatite could be leached

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REACTION KINETICS OF SULFURIC ACID LEACHING OF BRASS ...

REACTION KINETICS OF SULFURIC ACID LEACHING OF BRASS FOUNDRY FLUE DUSTS. In S. J. Grayson, D. A. Smith (Eds.), Preprint Society of Mining Engineers of AIME Littleton, CO, USA: Soc of Mining Engineers of AIME.

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Uranium acid mine drainage Wikipedia

Uranium acid mine drainage ... Extraction of uranium from the ore may occur under acid or alkaline leaching processes using sulfuric acid and sodium carbonate respectively. If leached with sulfuric acid, uranyl forms a soluble uranyl sulfate complex in the following reaction.

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Leaching Behavior of Heavy Metals and Transformation of ...

Nov 21, 2012· Leaching Behavior of Heavy Metals and Transformation of Their Speciation in Polluted Soil Receiving Simulated Acid Rain. ... Acid rain favors the leaching of heavy metals from the contaminated purple soil and causes the heavy metal fractions to become more labile. A decrease in the pH from to significantly enhanced such effects.

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A Comparative Study on Acid Leaching of Low Grade ...

A Comparative Study on Acid Leaching of Low Grade Manganese Ore Using Some Industrial Wastes as Reductants ... ฀ sawdust฀and฀lactose฀respectively. technologies,฀the฀introduction฀of฀new฀technologies฀as฀a฀result฀of฀a฀better฀ understanding฀ the฀ complex฀ processes฀ involved฀ and฀ improvement฀ in฀ Un ...

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Quantitative Leaching of a Nigerian Iron Ore in ...

quantitative leaching of a Nigerian iron ore. Therefore, this work will provide data on the quantitative leaching and the kinetics of dissolution behaviour of the iron ore in hydrochloric acid solutions. This work is interesting from the industrial perspective, as it could provide optimum conditions for the commercial production of ferric

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Leaching of Zinc Oxide in Acidic Solution

Sulfuric acid and hydrochloric acid were used for leaching test. The pH value was maintained in same value during the ... in Figs. 2 and 3 respectively. In these figures C represents the ... Leaching of Zinc Oxide in Acidic Solution 2491. Effects of the rotating speed The leaching reaction of zinc oxide by hydrochloric acid

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LEACHING OF ZINC FROM LOW GRADE OXIDE ORE USING …

The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was ... Leaching of zinc from low grade oxide ore using organic acid ... and Espiari et al. (2006) in the treatment of the zinc oxide ore by alkaline and acidic leaching respectively. Effect of acid concentration . The effect of acid concentration was ...

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Uranium Mining and Extraction from Ore Robert B. Laughlin

Uranium Mining and Extraction from Ore Ben Weil March 21, 2012 ... As in the case of acid leaching, ... These processes require significant amounts of acids or bases, the most commonly used being sulfuric acid and sodium carbonate, respectively.

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Factors Research on the Influence of Leaching Rate of ...

The leaching rates for nickel and cobalt were % and %, respectively, and the contents of nickel and cobalt in leaching slag were % and %, respectively. The obtained leaching solution con ... high pressure acid leaching with sulfuric acid, hydro chloric acid, nitric acid, or ammonia leaching, chlorine

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Pressure acid leaching of black shale for extraction of ...

The experiment results of pressure acid leaching of converter slag show that leaching rates of vanadium and titanium are % and % respectively, at 140 …

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Sulfuric acid leaching of Kab Amiri niobium–tantalum ...

The maximum leaching extent of rare observed that the leaching extents are high with the earths and thorium was obtained by mixing concen exception of uranium and titanium, which are below trated nitric acid of M with M sulfuric acid, 50%, due to their incorporation in the primary ura the recovery was 70% and 84%, respectively (Fig ...

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Study of the Leaching of A Manganese Mining Residue by ...

Study of the Leaching of A Manganese Mining Residue by Na 2 SO 3 ... respectively. The activation energy for the ... ores either by reduction roasting followed by acid leaching or by aqueous reduction using various reducing agents. The former involves high ...

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Uranium Extraction from Tailings by Dilute Alkali ...

efficiency of dilute alkali pretreatment–sulfuric acid leaching is superior to direct acid leaching. Only 13 ppm and ppm of uranium remained in tailings by using NaOH and Na 2CO 3, respectively, with an alkali concentration of 10 g/L, a liquidtosolid ratio of 20, and an agitation of 400 rpm for 2 h. In

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Sulphuric acid leaching of zinc and copper from Nigerian ...

followed by sulphuric acid leaching in conjunction with hydrogen peroxide. Sulphuric acid leaching Sulphuric acid solution (1M, 100 ml)) was introduced into the reactor. At the desired temperature, 2 g of the concentrate ... µm respectively and stirring speeds of 180, 200 and 220 rpm. Sulphuric acid with hydrogen peroxide leaching

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HIGH PRESSURE SULPHURIC ACID LEACHING OF ... Strona …

respectively, at acid/ore ratio of and leaching temperature of 240 °C. In this study, the leaching behaviours of Mg, Ca, Mn, Al and Cr were also determined.

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Germanium Gallium Ore Leaching with Sulfuric Acid

Increasing the pulp density of the leach slurry was studied as a method to use acid more efficiently (less sulfuric acid to maintain the same acid concentration). Table 3 shows the effect on metal extraction when the initial % solids in Stages A and B were 25% and 30%, respectively.

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Al28 Recovery of impurities from secondary alumina by ...

Recovery of impurities from secondary alumina by acid leaching Thor Anders Aarhaug1, Arne Petter Ratvik2 and Svetlana Kalyavina3 1. Senior Scientist ... HNO3, HCl and H2SO4, respectively. Based on these results, which showed little difference in leaching …

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Leaching Procedure and Kinetic Studies of Cobalt in ...

acid as leaching agent to precipitate the cobalt as cobalt oxalate. Aluminum and lithium in the liquor can be ... NaOH and Na 2 CO 3 respectively (Sun et al., 2012). With the development of leaching technology, bioleaching methods appeared(R ohwerderet …

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Coutilization of spent potlining and coal gangue by ...

With a hydrochloric acid concentration of 2 mol/L, the maximum leaching rate of aluminum in the mixture was %; when the hydrochloric acid concentration was increased to 6 and 10 mol/L, the maximum aluminum leaching rate reached % and %, respectively.

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Extraction of Tin and Copper by Acid Leaching of PCBs

Extraction of Tin and Copper by Acid Leaching of PCBs Amit Chaurasia*, ... Sulfuric acid was found unable to leach the solder at low concentrations, so further study ... respectively. International Journal of Metallurgical Engineering 2013, 2(2): 243248 245 .

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Recovery of Alumina from Khushab Baux ite by Leaching with ...

incomplete leaching has been resulted under the conditions H2SO4, t= 2 h and quantity of acid 60 mL. Weight of solid residue of Sultan Mehdi, Chamil More, Niaz Mine and Nadi were g, g, g and g, while the weights of filtrate were 88 g, 89 g, 82 g and 90 g respectively. The loss of material the Material ...

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difference between leaching process and secondary ...

Sep 27, 2018· Thus, the process of froth flotation is not solely dependent upon the density of the as a result of differences in the ability of air bubbles to selectively adhere to the surface of the Acid leaching of lowgrade Cu, Au, Ag, Pt ore and tailing pad is a common practice. R. Dunne, in Gold Ore Processing (Second Edition), 2016.

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