Environmental Toxicity Analysis and Reduction
of Ceramsite Synthesis from Industrial
Coal Gasification Coarse Cinder Waste

Jia, Jianli; Hu, Lei; Zheng, Jiaxing; Zhai, Yujia; Yao, Peng; Zhao, Shenwei; Shi, Shaohe; Zhai, Xiaobo; Zhang, Dayi

doi:10.15244/pjoes/64655

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The white areas were feasible regions which could produce ceramsite adsorbents with acceptable fluoride removal ratio and ceramsite strength; 5.0 N is the minimum mechanical strength of qualified ceramsite (GB/T 17431.1–2010). The lower and upper bounds of ceramsite strength were 8.0 and 12.0 N respectively, except for the proportion of corn starch fixed at 0.2 (6.0–8.0 N), similar to that of industrial coal gasification coarse cinder ceramsite (3.2–24.0 N) . The lower and upper bounds of fluoride removal ratio were fixed at 80.0 and 92.0% respectively.…”

Section: Resultsmentioning

confidence: 78%

Volcanic rock‐based ceramsite adsorbent for highly selective fluoride removal: function optimization and mechanism

Chao

Zhao

Song

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: While various granular adsorbents have been studied for fluoride removal from water, this study focuses on the optimization of mixture proportions of volcanic rock, bentonite, corn starch and aluminum sulfate using a four-component simplex-centroid mixture design (SCMD) method to achieve preferable fluoride removal ratio and ceramsite mechanical strength. To illustrate the adsorption mechanism, a series of experiments, including adsorption isotherms, adsorption kinetics and effects of pH value and co-existing anions, was carried out. RESULTS: The synthesized adsorbent was mesoporous with 77.82% pore size distribution in the range 1.70-38.80 nm by detailed physicochemical characterization. A stable fluoride removal ratio (87.5%) was obtained in the wide pH range of 4.0-11.0, and the adsorption capacity was 10.17 mg g −1 at 298 K. The adsorbent remained high selectivity for F − in the presence of sulfate (SO 4 2− ), chloride (Cl − ) and nitrate (NO 3 − ), while carbonate (HCO 3 − ) posed a slight adverse effect on F − adsorption due to ion competition. This adsorption process was well fitted with the pseudo-second-order kinetic model and the Freundlich isotherm model. Electrostatic attraction and M + -H 2 O and M + -F ligand exchange were dominant in the adsorption mechanisms. CONCLUSION: The synthesized ceramsite adsorbent will be competitive in the application for F − removal from aquatic environments.

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Section: Resultsmentioning

confidence: 78%

Volcanic rock‐based ceramsite adsorbent for highly selective fluoride removal: function optimization and mechanism

Chao

Zhao

Song

et al. 2019

J of Chemical Tech & Biotech

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“…This suggests that the increase in the content of coarse slag reduces water absorption in the ceramsite. When these results were compared to those of sintered ceramsites (Jia et al 2017), they were found to be comparable. However, taking into consideration the large investment, complicated technology, and high energy consumption of the sintering process, the non-sintered ceramsites can be considered more advantageous.…”

Section: Water Absorptionmentioning

confidence: 80%

“…This increase in the compressive strength is also a major advantage of non-sintered ceramsites. Compared to the sintered ceramsite (Jia et al 2017), the compressive strength of non-sintered ceramsites was basically the same. The strength of some non--sintered ceramsites was lower than that of sintered ceramsites; however, the continued increase in the strength of non-sintered ceramsites after curing resulted in a compressive strength comparable to that of the sintered ceramics.…”

Section: Effect Of Raw Materials Distribution Ratio On Basic Properti...mentioning

confidence: 88%

Archives of Environmental Protection

Zhao¹,

Yao²,

He³

et al. 2019

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In this study, non-sintered ceramsite was prepared using coal gasifi cation coarse slag obtained from a methanol plant. The basic performance and heavy metal leaching toxicity were analyzed. The results showed that seven out of nine non-sintered ceramsite groups were in accordance with the national standard of compressive strength (5 MPa), while only three groups met the national standard of water absorption index of less than 22%. The heavy metal concentrations in these three groups were found to be lower than that specifi ed in National Class IV of surface water environment standards. The concentration of Cr was found to be 16.45 μg/L, which represents only 1% of the IV standard. The optimum mixing ratio, which showed high compressive strength (6.76 MPa) and low water absorption (20.12%), was found to be 73% coal gasifi cation coarse slag, 15% cement, and 12% quartz sand. The characterization using Fourier transform infrared spectroscopy showed that the formation of gelatin in ceramsite enhances the performance of the ceramsite base and increases the immobilization of heavy metal. The study proved that the preparation of non-sintered ceramsite using coal gasifi cation coarse slag reduces its environmental risk and achieves effi cient utilization of the slag. Therefore, it can be concluded that it is a feasible and environmental friendly method for the disposal of coal slag.

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“…Although sintered ceramsite have a macroscopic large pore structure but a relatively smooth microscopic surface, so there are almost no microporous and mesoporous structures on the surface of ceramsite [7,8]. Therefore, the specific surface area of the original sintered ceramsite is relatively small, resulting in poor adsorption capacity, far lower than that of other filter medias such as zeolite and activated carbon [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mild Acid-Alkali Modification of Ceramsite: a Low-Cost Adsorbent for Lead Removal

Yuan,

Wang,

Wang

2023

Pol. J. Environ. Stud.

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In order to improve the adsorption capacity of waste-based ceramsite, this study proposed to use acid-alkali surface modification to enhance the adsorption capacity of ceramsite for heavy metals. In acid treatment, the ceramsite surface generated a composite pore structure, thus the specific surface area of ceramsite is significantly increased through acid treatment. In alkaline treatment, hydroxyl functional groups were loaded on the surface of the ceramsite, therefore the adsorption capacity for heavy metals was significantly improved. The surface of modified ceramic particles carries a negative charge, which is beneficial for the adsorption of cations. Taking lead ions as an example, the adsorption performance of ceramic particles on heavy metals was tested, and the maximum adsorption capacity reached 33.2 mg/g. Furthermore, the modified ceramic particles exhibit good desorption and regeneration properties. The modified ceramsite offers advantages in terms of raw material sources and production costs compared to natural zeolite.

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Environmental Toxicity Analysis and Reduction of Ceramsite Synthesis from Industrial Coal Gasification Coarse Cinder Waste

Cited by 6 publications

References 19 publications

Volcanic rock‐based ceramsite adsorbent for highly selective fluoride removal: function optimization and mechanism

Volcanic rock‐based ceramsite adsorbent for highly selective fluoride removal: function optimization and mechanism

Archives of Environmental Protection

Mild Acid-Alkali Modification of Ceramsite: a Low-Cost Adsorbent for Lead Removal

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