scholarly journals Investigation on the Effect of Roasting and Leaching Parameters on Recovery of Gallium from Solid Waste Coal Fly Ash

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1251 ◽  
Author(s):  
Jing Huang ◽  
Yingbin Wang ◽  
Guanxuan Zhou ◽  
Yu Gu
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
Cost Effective ◽  
Mass Ratio ◽  
Leaching Process ◽  
Cost Effective Method ◽  
Roasting Temperature ◽  
Leaching Parameters ◽  
Roasting Time

Coal fly ash (CFA) provides important resources of gallium, which is regarded as an irreplaceable material in many technologies. A prospective roasting reagent assisted acid leaching process was proposed for the purpose of extracting gallium. The extraction efficiency of gallium by NaF (sodium fluoride) roasting followed by HNO3 (nitric acid) leaching process was demonstrated. The effect of roasting temperature, roasting time, the NaF-CFA mass ratio, acid leaching temperature, acid leaching time, and acid concentration were investigated. The results revealed that under optimal conditions (roasting temperature of 800 °C, roasting time of 10 min, acid leaching in 2 mol/L HNO3 for 1 h, and the NaF-CFA mass ratio of 0.75:1), 94% of gallium was extracted. Compared to previous studies, the process is a cost-effective method which can greatly shorten reaction time. It can reduce environmental pollution as it requires fewer acid reagents with low concentration and additives. It is expected to provide a method for the extraction of gallium from CFA.

Factors of Extracting Lithium from Lepidolite by Sulfate Roasting and Dilute Sulphuric Acid Leaching

2014 ◽  
Vol 522-524 ◽  
pp. 1467-1470 ◽  
Author(s):  
Xiang Zhong Kong ◽  
Hua Ye ◽  
Yu Qin
Keyword(s):  
Sulphuric Acid ◽  
Extraction Efficiency ◽  
Acid Leaching ◽  
Mass Ratio ◽  
Roasting Temperature ◽  
Roasting Time

Sulfate roasting and dilute sulphuric acid leaching were applied to extract lithium from lepidolite. Several conditions including roasting temperature, roasting time, K2SO4and CaO were investigated to improve the lithium extraction efficiency, the final lithium extraction efficiency could attain 94% with the conditions as follows: roasting temperature 850°C, roasting time 2 h, K2SO4to lepidolite mass ratio 0.15 and CaO to lepidolite mass ratio 0.75.

Preparation of α-Alumina from Coal Fly Ash by Sintering with Sulfuric Acid

2010 ◽  
Vol 113-116 ◽  
pp. 2039-2044 ◽  
Author(s):  
Wen Ning Mu ◽  
Yu Chun Zhai
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
National Standards ◽  
Sintering Process ◽  
Optimal Parameters ◽  
Mass Ratio ◽  
Sulfuric Acid Leaching ◽  
Sintering Time

A technology was studied to prepare -alumina from fly ash, and the integrated process flow including sintering with sulfuric acid, leaching, recrystallization, calcination was established in this paper. The influences including the particle size of fly ash, sintering temperature, sintering time and the mass ratio of sulfuric acid to fly ash on the extraction ratio of alumina were investigated and discussed during sintering process, and the optimal parameters were determined. The product of -alumina was examined by chemical analysis, XRD and SEM, and the results show that α-alumina reach the national standards.

scholarly journals An Experimental and Thermodynamic Equilibrium Analysis on the Leaching Process of Arsenic (As) from Coal Fly Ash

2021 ◽  
Vol 100 (8) ◽  
pp. 102-109
Author(s):  
Ulung Muhammad SUTOPO ◽  
Erda Rahmilaila DESFITRI ◽  
Farrah Fadhillah HANUM ◽  
Yukio HAYAKAWA ◽  
Shinji KAMBARA
Keyword(s):  
Fly Ash ◽  
Thermodynamic Equilibrium ◽  
Coal Fly Ash ◽  
Equilibrium Analysis ◽  
Leaching Process

scholarly journals An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes

Metals ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 272 ◽  
Author(s):  
Shenyong Li ◽  
Shenjun Qin ◽  
Lianwei Kang ◽  
Jianjun Liu ◽  
Jing Wang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
Efficient Approach ◽  
Aluminum Recovery

Adsorption and stabilization of nickel ions on fly ash/lime mixing

2000 ◽  
Vol 42 (5-6) ◽  
pp. 79-85 ◽  
Author(s):  
P. Ricou-Hoeffer ◽  
V. Héquet ◽  
I. Lécuyer ◽  
P. Le Cloirec
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Influential Factors ◽  
Metallic Ions ◽  
Mass Ratio ◽  
Solution Ph ◽  
Nickel Ions ◽  
Experimental Design Methodology ◽  
By Products ◽  
Lime Addition

Experimental design methodology was used to define conditions for the adsorption and the stabilization of nickel ions (initial concentration of 500 mg.L-1) on coal fly ash/lime sorbent. This type of sorbent allows the reuse of by-products and increases the stabilization of metallic ions by lime addition. It was shown that the solution pH, the metal/adsorbent mass ratio, the type of fly ash used as sorbent, and the fly ash/lime mass ratio are the most influential factors. A set of parameters was finally obtained (pH 5, metal/adsorbent ratio of 0.01 g.g-1, fly ash/lime ratio of 4 g.g-1, fly ash with the lowest content of iron oxide) for which the removal of Ni2+ is 96% and the leaching 0.03% by permuted water and 0.2% by acid solution of pH 2.

Novel process of alumina extraction from coal fly ash by pre-desilicating—Na2CO3 activation—Acid leaching technique

2017 ◽  
Vol 169 ◽  
pp. 418-425 ◽  
Author(s):  
Yanxia Guo ◽  
Zesen Zhao ◽  
Qian Zhao ◽  
Fangqin Cheng
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching

Experimental parameter optimization study on the acid leaching of coal fly ash

2015 ◽  
Vol 57 (23) ◽  
pp. 10894-10904 ◽  
Author(s):  
Long Yan ◽  
Junfei Shang ◽  
Yufei Wang ◽  
Jian Li ◽  
Huijin Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Parameter Optimization ◽  
Coal Fly Ash ◽  
Experimental Parameter ◽  
Acid Leaching ◽  
Optimization Study
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