Influence of microwaves on the leaching kinetics of uraninite from a low grade ore in dilute sulfuric acid

Madakkaruppan, V.; Pius, Anitha; Sreenivas, T.; Giri, Nitai Charan; Sarbajna, Chanchal

doi:10.1016/j.jhazmat.2016.03.050

Cited by 48 publications

(15 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observations made from the particle size effect further indicated that the coarse nature of the ore particles might not be suitable for the iron dissolution. The findings of this study indicated that increasing the ore particle size reduced the dissolution rate of iron from Akwuke ore and was in strong agreement with previous works on the dissolution process of metallic oxides from ores (Baba et al 2012;Jianrong et al 2016;Madakkaruppan et al 2016;Adekola et al 2018).…”

Section: Effect Of Particle Size and Agitation Rate On Iron Dissolutisupporting

confidence: 93%

“…1). Also, previous studies reported that the finer ore particles produced at lower particle sizes provided an increased surface area to alkaline volume ratio, which enhanced the dissolution rate (Nadeem et al 2014;Madakkaruppan et al 2016;Seyed and Azizi, 2018). The observations made from the particle size effect further indicated that the coarse nature of the ore particles might not be suitable for the iron dissolution.…”

Section: Effect Of Particle Size and Agitation Rate On Iron Dissolutimentioning

confidence: 93%

See 1 more Smart Citation

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Ani

Chukelu

2020

Bull Natl Res Cent

View full text Add to dashboard Cite

Background The dissolution process kinetics and optimization of iron from Akwuke ore were investigated in this study. The effects of process parameters such as agitation rate and ore particle size on the dissolution process were also examined. The Akwuke ore was characterized employing the XRD, FT-IR, SEM, and UV-spectroscopy. Results The results from the rate constants indicated that the diffusion through the boundary layer process with R2 > 0.96 was the rate-determining mechanism. The maximum iron dissolution rate of 83.2% was obtained at 45-μm particle size while 81.2% and 72.6% iron dissolution rates were obtained at 490 and 390 rpm agitation rates, respectively. Silicon oxide, aluminum oxide, and iron oxide were present in Akwuke ore as indicated from the XRD analysis. The RSM predicted optimum value of the iron dissolution rate from the numerical optimization was experimentally validated to confirm the satisfactory performance of the quadratic model. Conclusion This study concludes and presents the potential extraction of iron from Akwuke ore, which will be of immense benefit in hydrometallurgical process.

show abstract

Section: Effect Of Particle Size and Agitation Rate On Iron Dissolutisupporting

confidence: 93%

Section: Effect Of Particle Size and Agitation Rate On Iron Dissolutimentioning

confidence: 93%

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Ani

Chukelu

2020

Bull Natl Res Cent

View full text Add to dashboard Cite

show abstract

“…The temperature of the solution then became steady at boiling point since the leaching system was carried out at atmospheric pressure. The electromagnetic field of microwave induced the convective motion of the boiling solution and promoted the percussion and the contact of hydrogen ions from the acid to dissolve metal ions . The leaching efficiency of Pb was very low, below 3%, and did not increase with time, since the dissolved Pb ions could react with SO 4 2− from leaching agent to form PbSO 4 precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…The electromagnetic field of microwave induced the convective motion of the boiling solution and promoted the percussion and the contact of hydrogen ions from the acid to dissolve metal ions. [29][30][31] The leaching efficiency of Pb was very low, below 3%, and did not increase with time, since the dissolved Pb ions could react with SO 4 2− from leaching agent to form PbSO 4 precipitates. The leaching of Eu from waste CRT phosphor was completed in 60 min, while the leaching efficiency of Y was 78.07% and kept increasing slightly with time and reached 89.07% in 90 min.…”

Section: Leaching Kineticsmentioning

confidence: 99%

Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Lie

Ismadji

Liu

2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND Phosphor in discarded cathode ray tube (CRT) contained valuable metals, yttrium (Y) and europium (Eu), which are categorized as technology‐critical elements (TCEs) in terms of their supply risk and importance in emerging technologies. Microwave‐assisted leaching was applied to recover Y and Eu from waste CRT with sulfuric acid (H2SO4) solution as the leaching agent in the current study. It is aimed to develop an alternative leaching method of valuable metals from waste CRT phosphor. RESULTS The effects of microwave power and acid concentration on leaching efficiency of Y and Eu were investigated. Shrinking‐core model could describe the leaching kinetics of Y and Eu well and it was controlled by chemical reaction and diffusion through the product layer. Higher leaching efficiency was found when microwave power increased from 200 to 600 W, and was also found as acid concentration increased from 0.5 to 2 mol L−1. Leaching efficiency of Y and Eu were 78.07% and 100%, respectively, for Y and Eu within 60 min at microwave power of 400 W, using 2 mol L−1 of H2SO4 at 10 g L−1 of solid to liquid ratio. Compared with conventional leaching, microwave‐assisted leaching is an alternative technology that could shorten reaction time significantly. CONCLUSIONS The concentration of acid and microwave power affected microwave‐assisted leaching of Y and Eu from waste CRT phosphor. Microwave‐assisted leaching could be an alternative process for rare earth elements recovery. © 2019 Society of Chemical Industry

show abstract

“…This is possibly due to the fact that the polar molecules in the leaching system vibrate rapidly in the microwave field, producing a large amount of energy, which heats the solution and increases the collision frequency between the slag materials and solution. Moreover, the fresh surfaces in the slag particles exposed on the crack caused by the microwave are beneficial for the extraction reaction [23][24][25]. ethylenediaminetetraacetic acid (EDTA) titration method of GB/T 15452-2009 [22].…”

Section: Calcium Leaching By Nh 4 CL With Conventional and Microwave mentioning

confidence: 99%

Microwave-Supported Leaching of Electric Arc Furnace (EAF) Slag by Ammonium Salts

Tong

Zhang

et al. 2017

Minerals

View full text Add to dashboard Cite

Abstract:The effect of microwave-supported leaching of electric arc furnace (EAF) slag by ammonium salts was investigated to improve calcium leaching ratio for CO 2 mineral sequestration process. The results show that the calcium leaching ratio from EAF slag at the constant temperature in the microwave field increases about 10% than that under the water bath at the same leaching time. The greater the microwave power, the higher the impact of calcium leaching rate, which proves that microwave treatment can improve the leaching ratio of calcium. The rapid calcium leaching step (up to 5 min) is possibly due to the easy reaction of calcium silicate, while the slower calcium leaching step (after 5 min) is owing to the difficult reaction of calcium ferroaluminates for the hydrolysis of iron and aluminum. The leaching behaviors of magnesium and calcium ions affected by different leaching parameters are similar and the concentration of aluminum, iron and phosphorus can be neglected. Calcium ion is probably not precipitated in the real leaching solution from steel slag by ammonium chloride solution as its concentration is less than 0.32 mol/L. However, the concentration of magnesium ion starts to drop sharply when the pH value is higher than 10 and it has precipitated completely at pH value of 11.6.

show abstract

Influence of microwaves on the leaching kinetics of uraninite from a low grade ore in dilute sulfuric acid

Cited by 48 publications

References 18 publications

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Effects of alkali solution on the dissolution kinetics and optimization processes of iron from Akwuke ore

Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Microwave-Supported Leaching of Electric Arc Furnace (EAF) Slag by Ammonium Salts

Contact Info

Product

Resources

About