Recovery of gallium from sulfuric acid leach liquor of coal fly ash by stepwise separation using P507 and Cyanex 272

2020 ◽  
Vol 381 ◽  
pp. 122699 ◽  
Author(s):  
Zesen Zhao ◽  
Li Cui ◽  
Yanxia Guo ◽  
Huiquan Li ◽  
Fangqin Cheng
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Leach Liquor ◽  
Cyanex 272 ◽  
Acid Leach

A stepwise separation process for selective recovery of gallium from hydrochloric acid leach liquor of coal fly ash

2021 ◽  
Vol 265 ◽  
pp. 118455
Author(s):  
Zesen Zhao ◽  
Li Cui ◽  
Yanxia Guo ◽  
Jianming Gao ◽  
Huiquan Li ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hydrochloric Acid ◽  
Coal Fly Ash ◽  
Separation Process ◽  
Leach Liquor ◽  
Selective Recovery ◽  
Acid Leach

Extraction of Aluminum from Coal Fly Ash Using Pressurized Sulfuric Acid Leaching with Emphasis on Optimization and Mechanism

JOM ◽  
2021 ◽  
Author(s):  
Peng Wang ◽  
Huiyong Liu ◽  
Fangyan Zheng ◽  
Yue Liu ◽  
Ge Kuang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching

Extracting Alumina from Coal Fly Ash with Concentrated Sulfuric Acid Sintering and Ultrasound Aided Leaching

2015 ◽  
pp. 31-38
Author(s):  
Wenbo Luo ◽  
Jilai Xue ◽  
Jun Zhu ◽  
Kang Liu ◽  
Chunlei Yang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Concentrated Sulfuric Acid

Dewaterability of Excess Activated Sludge with Fly Ash Conditioning

2013 ◽  
Vol 726-731 ◽  
pp. 2651-2654
Author(s):  
Chang Nian Wu ◽  
Wei Hua Li ◽  
Qi Ling ◽  
Li Wang ◽  
Fa Kang Pan ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Fly Ash ◽  
Activated Sludge ◽  
Extracellular Polymeric Substance ◽  
Specific Resistance ◽  
Coal Fly Ash ◽  
Polymeric Substance ◽  
Conditioning Process ◽  
Sludge Dewaterability ◽  
Sludge Conditioning

The coal fly ash (CFA)/coal fly ash modified by sulfuric acid (MCFA)-conditioned sludge dewaterability was investigated in this study. Specific resistance of filtration (SRF) was used to assess the sludge dewaterability. Extracellular polymeric substance (EPS) was determined in attempt to explain sludge conditioning process. The results showed that SRF of the sludge significantly decreased with coal fly ash addition, and the MCFA showed much stronger conditioning capacity than the raw coal fly ash. Under a MCFA dosage of 36g.L-1, the SRF of the sludge decreased from 1.18×1012 to 6.47×1010 m.kg1, and EPS concentration of the sludge decreased from 32.64 to 17.55mg.L-1. The sludge conditioning mechanisms with MCFA mainly included improving adsorption bridging and providing the water transmitting passages by skeleton builder.

Extraction of alumina from coal fly ash using an acid leach-sinter-acid leach technique

2015 ◽  
Vol 157 ◽  
pp. 348-355 ◽  
Author(s):  
A. Shemi ◽  
S. Ndlovu ◽  
V. Sibanda ◽  
L.D. van Dyk
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Acid Leach

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.

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