Preparation of NaA Zeolite from High Iron and Quartz Contents Coal Gangue by Acid Leaching—Alkali Melting Activation and Hydrothermal Synthesis

Kong, De‐Xing; Jiang, Rongli

doi:10.3390/cryst11101198

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…Liupanshui City (Guizhou Province, China) produces over 10 million tons of gangue each year; this amount has exceeded 200 million tons when the accumulation of previous years is taken into account. Compared to other regions in China, coal gangue from Liupanshui has high iron content and medium aluminum content and is reddish after calcination, making it unsuitable for making products requiring high whiteness, such as ceramics [ 14 ]; this further narrows the scope for utilization. However, coal gangue is a rejected resource of aluminum and iron, from which aluminum and iron ions can be extracted to expand the applications of gangue.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

et al. 2022

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Poly aluminum-ferric Chloride (PAFC) is a new type of high efficiency coagulant. In this study, high iron type gangue is used as a main raw material. It is calcined at 675 °C for 1 h and 3% CaF2 is added to the calcined powder and reacted with 20% hydrochloric acid at 93 °C for 4 h. The leaching ratio of aluminum ions is 90% and that of iron ions is 91%. After Fe2+ ions are oxidized in the filtrate, CaCO3 is used to adjust the pH of the filtrate to 0.7. The microwave power is adjusted to 80 W and the filtrate is radiated for 5 min. After being aged for 24 h, PAFC product is obtained. The prepared PAFC is used to treat mine water and compared with the results of PAC and PAF, the turbidity removal ratio of PAFC is 99.6%, which is greater than 96.4% of PAC and 93.7% of PAF. PAFC is a mixture with different degrees of polymerization. It demonstrates that extracting aluminum and iron ions from high iron content gangue to prepare PAFC by microwave is efficient and feasible.

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Section: Introductionmentioning

confidence: 99%

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

et al. 2022

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“…In previous works, coal gangue by alkali melting activation‐acid leaching was utilized to synthesize zeolites, 34 but the optimal conditions were not explored. To find out the best preparation conditions for mesoporous materials, the orthogonal experimental design was used to solve the problem 35 .…”

Section: Methodsmentioning

confidence: 99%

Utilization of coal gangue for preparing high‐silica porous materials with excellent ad/desorption performance on VOCs

Jiang

Zhao

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: Coal gangue causes a series of environmental problems due to its low utilization rate and high amount of hoarding. However, the preparation of porous materials with coal gangue is an effective method of resource utilization. Mesoporous silica and meso-microporous ZSM-5 were prepared with alkali melting activation-acid leaching and hydrothermal synthesis, respectively. The orthogonal experiment was used to explore the optimal preparation conditions for mesoporous silica. Meso-microporous ZSM-5 were characterized with instruments. The adsorption and desorption performance of the porous material was explored by dynamic adsorption/desorption on volatile organic compounds (VOCs).RESULTS: The optimal preparation conditions for mesoporous silica are a roasting temperature of 800 °C, mass ratio of coal gangue to sodium carbonate of 1:0.6, and sulfuric acid leaching of 4 mol L −1 . The characterization results show that the molecular sieve has a superior specific surface and a certain amount of mesoporous pores due to the addition of the appropriate mesoporous template. The results of toluene dynamic adsorption experiments show that the meso-microporous ZSM-5 (ZSM-5-0.025PAC) has excellent adsorption and desorption performance (the adsorption capacity is up to 47.02 mg g −1 ), water resistance (the adsorption capacity decreased only 4.64%), and renewability (the adsorption and desorption efficiency is up to 95% and 97%).CONCLUSION: The porous materials prepared presented excellent VOCs ad/desorption performance, which has good industrial application prospects. The research provides a novel approach for the utilization of coal gangue.

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“…123 Combined methods, including the alkali fusion-hydrothermal method, ultrasonic-hydrothermal method, and ball milling−hydrothermal method, which have better performance than traditional methods, have also been tested. 54,124 As shown in Table 3, the synthetized zeolite types include NaA, 53,120,123,125 NaX, 52,118,124,126,127 NaY, 119 SSZ-13, 128 ZSM-5, 129 magnetic zeolite, 54 and zeolite/activated carbon composites. 120,130 Qian et al 123 synthesized NaA zeolite molecular sieves with a high specific surface area and Ca 2+ exchange capacity using CG as a raw material.…”

Section: Zeolitesmentioning

confidence: 99%

Fabrication and application of porous materials made from coal gangue: A review

Shao

Zheng

et al. 2023

Int J Applied Ceramic Tech

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Coal gangue (CG), which is mainly generated during coal excavation, mining, and coal washing, is an industrial solid waste that is recognized as an environmental pollutant. The ever‐increasing amount of CG produced is a serious threat to the ecological environment and property safety, especially in China, which is the largest coal producer and consumer in the world. Considerable studies have investigated means for utilizing CG worldwide. This review summarizes and discusses various porous inorganic materials made from CG, including cement‐based porous materials, porous bricks, porous ceramics (cordierite and mullite) and glasses, porous geopolymers, zeolites, aerogels, and porous carbon materials. Different preparation processes and performances of each type of porous inorganic materials were reviewed. Porous CG‐based materials can be used as promising adsorbents for the removal of various pollutants and have good potential for use in construction industry as well as catalyst material applications. Besides, porous materials obtained from CG have also been tested as slow‐release fertilizers after the absorption of phosphate, as electrode materials, and as oil‐in‐water separation agents. The systematic summary of porous materials based on CG aims at promoting high‐value‐added applications for this waste. Future research directions for the use of CG as a raw material are also presented.

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Preparation of NaA Zeolite from High Iron and Quartz Contents Coal Gangue by Acid Leaching—Alkali Melting Activation and Hydrothermal Synthesis

Cited by 10 publications

References 41 publications

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

Preparation of Poly Aluminum-Ferric Chloride (PAFC) Coagulant by Extracting Aluminum and Iron Ions from High Iron Content Coal Gangue

Utilization of coal gangue for preparing high‐silica porous materials with excellent ad/desorption performance on VOCs

Fabrication and application of porous materials made from coal gangue: A review

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