Study on electrochemical improvement of flotation reagents for carbon recovery from coal gangue

Zhang, Tao; Yang, Huifen; Zhang, Hongbo; Zhang, Peng

doi:10.1080/15567036.2021.2024303

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…Coal gangue is solid waste produced by coal mining and washing [ 1 ]. It currently accounts for the largest amount of industrial waste in China [ 2 ], and its piling pollutes the environment and produces additional negative effects [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF2 Assistance and Process Optimization

et al. 2023

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To reveal how CaF2 improves the dissolution ratios of aluminum and iron ions in coal gangue, CaF2 and hydrochloric acid are used to extract Al3+ and Fe3+ from the coal gangue calcined powder. The leaching ratios of Al3+ and Fe3+ are measured, and the filter residues are analyzed by BET, XRD, and SEM. The results show that adding 3% CaF2 could increase the extraction ratio of Al3+ from 62.96% to 92.10% under optimized conditions, and that of Fe3+ is increased from 85.12% to 95.73%. The mechanism of CaF2 as an auxiliary to improve the leaching ratio of Fe3+ is that HF reacts with the thin layers of gangue calcined powder containing silica to form soluble SiF4, thus forming pores that promote the diffusion of H+ and inner ions, improving the leaching ratios of Al3+ and Fe3+. Finally, the CaF2-assisted acid leaching process is optimized. The results showed that it is efficient and feasible to extract Al3+ and Fe3+ with the assistance of CaF2 and that HF has a catalytic effect in the reaction system. This work provides a reference for the next step of actual production.

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Section: Introductionmentioning

confidence: 99%

Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF2 Assistance and Process Optimization

et al. 2023

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“…4 The CG in Inner Mongolia has the characteristics of high aluminum and high silicon, producing more than 100 million tons per year, which has great recycling value. 5 At present, the recovery of alumina from CG mainly includes acid method, alkali method, acid-base combination method, and ammonia method. 6,7 Among them, the acid method is the simplest and most widely used method.…”

Section: Introductionmentioning

confidence: 99%

“…Although these methods can consume most of the CG, there are also shortcomings of low added value, such as low carbon CG is not suitable for power generation and CG usually contains a small amount of heavy metal elements, which is not suitable for large‐scale application in agriculture 4 . The CG in Inner Mongolia has the characteristics of high aluminum and high silicon, producing more than 100 million tons per year, which has great recycling value 5 . At present, the recovery of alumina from CG mainly includes acid method, alkali method, acid–base combination method, and ammonia method 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of monodisperse silica powder from acid residue after extracting alumina from coal gangue

Zhang

Yang

Zhang

2022

Asia-Pacific J Chem Eng

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A new method for preparing monodisperse silica powder was introduced in this paper. Monodisperse silica powder was synthesized by sol–gel method using sodium silicate prepared from acid residue after alumina extraction from coal gangue leached by NaOH. The dissolution rate of SiO2 was determined according to the potassium fluosilicate volumetric method (GB/T 27974‐2011). The SiO2 dissolution rate reaching 92.74% when dissolution temperature calcined at 90°C for 90 min, the liquid–solid ratio was 8 ml/g, and the concentration of NaOH solution was 30%. The maximum specific surface area of silicon powder reaching 519m2/g when the concentration of sodium silicate was 0.6 mol/l, ethyl acetate concentration was 8%, anhydrous ethanol concentration was 5%, and the reaction time was 90 min. X‐ray fluorescence (XRF), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM) showed that the content of SiO2 in the powder was 99.28%, the particle size was between 30 ~ 300 nm, and more than 90% of the particle size was below 100 nm.

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Aluminum extraction from activated coal gangue with carbide slag

Zhang

Yang

Zhang

et al. 2022

Journal of Analytical and Applied Pyrolysis

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Study on electrochemical improvement of flotation reagents for carbon recovery from coal gangue

Cited by 3 publications

References 15 publications

Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF2 Assistance and Process Optimization

Acid Leaching Extraction Mechanism of Aluminum and Iron Ions from Coal Gangue Based on CaF2 Assistance and Process Optimization

Preparation of monodisperse silica powder from acid residue after extracting alumina from coal gangue

Aluminum extraction from activated coal gangue with carbide slag

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