PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2022
·
IF 6.535
Yongda Huang,Hongyun Hu,Chan Zou,Huimin Liu,Shuai Li,Xiaojiang Wu,Lejin Xu,Hong Yao
The partitioning of selenium in coal-fired flue gas and desulfurization wastewater is of great threat to the ecological environment and human health. However, the unclear understanding of interactions between selenium vapors and fly ash hinders the emission control of selenium from coal-fired power plants. To further illuminate the mechanism of selenium partitioning and transformation, this study carefully estimated selenium distribution characteristics in the coal combustion byproducts from several industrial power plants. The effective temperature range as well as the key ash components for selenium retention by fly ash was clarified by multiple-scale experiments and theoretical perspectives. The results showed that gaseous selenium tended to be captured by fly ash at a medium-to-low temperature range (i.e. below 650 °C). The limited residence time resulted in the incomplete capture of gaseous selenium by fly ash. Mullite , quartz, iron oxides , and anhydrite in fly ash were found to be the main trappers for gaseous selenium. Among these components, iron oxides showed excellent selenium adsorption performance at a wide temperature range of 150-700 °C, which was realized by the strong chemical adsorption . By contrast, as the dominant phases in fly ash for the physical adsorption of gaseous selenium, mullite and quartz mainly captured gaseous selenium below 300 °C. On the other hand, sulfur dioxides had priority over gaseous selenium to react with calcium-containing ash components by forming anhydrite in the high-temperature region. The formed anhydrite had a limited selenium adsorption capacity , which was confirmed to capture gaseous selenium through a combination of physical adsorption and weak chemical adsorption. For the in-depth control of selenium emitted into desulfurization system and atmosphere environment, these findings provided a comprehensive insight into the behavior of selenium partitioning and transformation into fly ash during coal combustion.
研究领域:
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2023
·
IF 3.3
Yanhua Teng,Kangli Li,Long Chen,Kerui Wang,Changguo Xue
Coal gasification fine slag (CGFS) is a by-product of gasification process of gasification beds that pollutes the environment. To make the utilization of CGF more efficient, poly (vinyl chloride) (PVC)/CGFS composites were prepared via a melt blending process, and their mechanical and thermal properties were investigated. In order to dig deeper into the decomposition mechanism, the thermal degradation kinetics were systematically analyzed by drawing non-isothermal heat maps based on the Flynn-Wall-Ozawa, Friedman, and Kissinger model-free methods. According to the results, the properties of all tests vary significantly with CGFS content. In particular, at a the CGFS content of 20 phr, the tensile strength (tensile modulus) and flexural strength (flexural modulus) of CGFS-20 were 13.5% (47.8%) and 13.9% (41.6%) higher, respectively, than those of conventional CGFS-0 composites. However, the impact strength decreases with the increase of CGFS content. At the same time, the addition of CGFS suppresses the mass conversion rate and improves the thermal stability of PVC composites at high temperature, and the final residual mass reaches 31%, which is 12.7% higher than that of pure PVC. The kinetic analysis of thermal decomposition shows that CGFS promotes the initial degradation of the composites reduces the activation energy of the reaction, and at the same time endows them with higher thermal stability in the high-temperature phase.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 20
·6116
·
IF 4.412
Yixin Zhang,Rumeng Wang,Guofeng Qiu,Wenke Jia,Yang Guo,Fanhui Guo,Jianjun Wu
A large amount of coal gasification slag is produced every year in China. However, most of the current disposal is into landfills, which causes serious harm to the environment. In this research, coal gasification fine slag residual carbon porous material (GFSA) was prepared using gasification fine slag foam flotation obtained carbon residue (GFSF) as raw material and an adsorbent to carry out an adsorption test on waste liquid containing methylene blue (MB). The effects of activation parameters (GFSF/KOH ratio mass ratio, activation temperature, and activation time) on the cation exchange capacity (CEC) of GFSA were investigated. The total specific surface area and pore volume of GSFA with the highest CEC were 574.02 m2/g and 0.467 cm3/g, respectively. The degree of pore formation had an important effect on CEC. The maximum adsorption capacity of GFSA on MB was 19.18 mg/g in the MB adsorption test. The effects of pH, adsorption time, amount of adsorbent, and initial MB concentration on adsorption efficiency were studied. Langmuir isotherm and quasi second-order kinetic model have a good fitting effect on the adsorption isotherm and kinetic model of MB.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 17
·46203
·
IF 1.901
Weidong Ai,Bing Xue,Cundi Wei,Kuizhou Dou,Shiding Miao
Coal gasification fine slag (CGFS) was processed via a grading technique. The CGFS products (CGFS-S1, CGFS-S2, CGFS-S3) with different sizes were obtained. Effects of particle size and unburned carbon on tensile properties of filled low density polyethylene (LDPE) were studied within the CGFS weight fractions ranging from 10 to 50 wt %. The tensile strength was found to increase with decreasing CGFS size, and the tensile properties exhibited good performance, owing to unburned carbon. The tensile strength of the composites increased with increasing CGFS-S3 weight fraction. The analysis of mathematical model and SEM revealed that the firm improvement of tensile strength resulted from the strong interactions between LDPE polymer chains and CGFS-S3 particles, and good dispersion of CGFS-S3 in resin. Thermogravimetric analysis proved obvious reinforcement in thermal-oxidative stability by incorporation of CGFS-S3. The degree of crystallinity of LDPE/CGFS-S3 showed the first increased and then decreased variation tendency. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46203.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jiupeng Zhang,Jing Zuo,Weidong Ai,Shuo Liu,Dandan Zhu,Jinyi Zhang,Cundi Wei
Deodorizing materials are often restricted from large-scale industrial production due to the high preparation cost. By utilizing the simple acid leaching technology, this study made use of the coal gasification fine slag (FS) as raw material to prepare a cost effective FS-based deodorant (FSD) with a specific surface area of 393 m 2 g −1 and a pore volume of 0.405 cm 3 g −1 . The propane adsorption test on FSD showed the maximum adsorption capacity to be as high as 121.61 mg g −1 at 273 K. The partition coefficient values at 10% and 100% breakthrough (BT) for FSD to adsorb propane were 1.5 × 10 −3 and 3.2 × 10 −4 mol kg −1 Pa −1 , respectively. Furthermore, the FSD was applied in the removal of volatile organic compounds (VOCs) pollutants from polypropylene resin (PP). It showed that the deodorizing effect of the FSD was nearly three times as good as the commonly used zeolite deodorants, which was able to decrease 50 percent of the VOCs volatilization amount in PP resin. Moreover, the FSD can better strengthen the mechanical properties of PP resin. This work provides a new method for the industrial production of deodorants as well as a new direction for the recycle of coal gasification wastes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Zekai Miao,Jianjun Wu,Guofeng Qiu,Zhenkun Guo,Xu Zhao,Yixin Zhang
The coal gasification fine slag (FS) is industrial waste consisting of residual carbon (RC) and slag particles (SP). High-performance hierarchical porous composite (HPC) was synthesized by chemical activation followed by hydrothermal treatment from FS. It has been realized that SP could play the positive role in developing pore structure of HPC which makes CO 2 uptake have a sharp increase. Through taking the advantage of SP, HPC has an obvious increase in surface area and pore volume from 914 to 1932 m 2 /g and 0.617 to 1.332 cm 3 /g, respectively. The changes of pore structure were mainly attributed to the two factors in a synergetic way. First, hydrothermal treatment could decrease the content of SP which acted as a ballast to reduce the surface area of activated carbon. Second, the formed silicate/aluminosilicate deposits on the carbon surface and forms silicate/aluminosilicate film on internal surface of carbon particles. This makes the meso-macropores change to micro- mesopores leading to the increase of the surface area and pore volume. The porous composites also showed high CO 2 adsorption performance. The 4-FSAC-HPC sample exhibits the highest CO 2 uptake of 3.25 mol/kg and 1.41 mol/kg at 25 and 50 °C, respectively, which is an increase of around 52% and 83% comparing with that of FSAC sample. Besides, CO 2 adsorption up to saturation can be achieved in less than 3 min. CO 2 uptake of the 4-FSAC-HPC sample was well regeneration efficiencies above 98% after 10 cycles adsorption/desorption. This work provides a new approach to prepare high-performance porous compositions using the material which contains not only carbon component but mineral matters. Furthermore, it realizes solving two industrial waste issues (fine slag and CO 2 ) simultaneous.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yanjie Niu,Liqing Chen,Sixi Guo,Jie Xu,Huachao Li,Fanhui Guo,Yixin Zhang,Jianjun Wu
Complex distribution forms of carbon/ash in coal gasification fine slag (GFS) make it impossible to separate precisely. A combined alkali fusion-polymerization-hydrothermal process was designed to synthesize porous carbon/minerals interwoven particle electrodes (FSAPH) co-constructed by carbon/ash from GFS for electrooxidation treatment of m -cresol wastewater. Based on the hydrogen bonding and coordination capabilities of polyaniline (PAIN), the deconstructed aluminosilicate was regenerated in sheet-like form dispersedly on carbon matrix, effectively enhancing synergistic behavior of carbon and minerals. The electrochemical assessment exhibited superior properties, including a large voltammetry charge of 9.533 mC/cm 3 , high oxygen evolution potential of 2.15 V, low charge-transfer resistance of 0.36 Ω, and excellent cycle stability. The three-dimensional electrode filled with 0.15 g FSAPH performed pre-adsorption of m -cresol without electricity. Intraparticle diffusion is mainly controlled by Si O Si/ Al OH groups on the mineral surface, and the adsorption rate constant K S1 reached 0.491·min −1 . After being electrified, Al OH converted H 2 O 2 via three pathways to generate reactive oxygen species (ROS). The rate-determining step in path 2 was the entry of oxygen atoms in OH into the Al OH lattice with the lowest energy barrier of 1.71 kcal/mol. 79.61 mg/L m -cresol can be rapidly degraded within 24 min, 2.6 times that of the two-dimensional electrode system. The electrostatic attraction of carbon ensured the continuous and rapid supply of H 2 O 2 near mineral active sites due to the carbon/minerals interwoven structure. Extensive catalytic sites in thin sheet-like minerals accelerated the electrooxidation of m -cresol on carbon, boosting the catalytic reaction kinetics. Hence, the study realized the comprehensive utilization of carbon/ash in GFS and waste treatment with waste.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yingkun Zhu,Jianjun Wu,Yixin Zhang,Zekai Miao,Yanjie Niu,Fanhui Guo,Yangchun Xi
With the spread and development of industrialization, CO 2 emissions are increasing dramatically, posing a serious threat to the global ecosystem. Based on coal gasification fine slag (CGFS) pore structure characteristics, CGFS was used to prepare carbon-ash composite hierarchically porous material by chemical activation and hydrothermal methods for CO 2 capture. It would achieve comprehensive and high value utilization of CGFS. In addition, the biomass combustion ash slag (BCA) is rich in alkali and metal elements, there are extremely important influence on CGFS pore formation. Therefore, the alkali and potassium sources were extracted in leaching experiments for CGFS-based porous materials preparation. It was found that the prepared porous material had a large specific surface area (1270 m 2 /g), a graded porous structure and excellent CO 2 adsorption capacity (4.06 mol/kg at 0 °C), while the pores of the BCA-impregnated porous material were further developed with a larger specific surface area (1406 m 2 /g) and more functional groups on porous material surface. All these results indicate the relevance between using BCA impregnates and material performance enhancement. Furthermore, the CGFS-based graded porous composite porous materials have great potential for repurposing in practical and industrial CO 2 adsorption applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Baijun Yan,Daya Wang,Liushun Wu,Yuanchi Dong
Stone coal, a kind of important vanadium-bearing resources in China, accounts for about 87% of the domestic reserves of vanadium. But the currently developed techniques to extract vanadium from stone coal are all confronted with environmental problems. For example, large quantities of caustic or greenhouse gases discharged in the oxidizing roast process, enormous consumptions of acid or alkali in the leaching step and massive tailings containing toxic V 5+ ions. With a view to solve those problems, an innovative process for pre-concentration of vanadium from stone coal was designed and confirmed on a laboratory scale. The distinct features of this design are as follows. Firstly, the environment-friendly Fe 2 O 3 is selected as a capturer of vanadium. Secondly, the natural reducing property of stone coal is utilized to promote the formation of magnetic V-rich phase, Fe 2 VO 4 . Thirdly, a high-grade vanadium concentrate is obtained by magnetic separation method. The practicability of this design was confirmed using industrial stone coal on a laboratory scale. When 10 mass% Fe 2 O 3 relative to stone coal was added and roasted at 1200 °C for 3 h, a high-grade concentrate containing vanadium higher than 14 mass% was obtained, and more than 91% of the total vanadium in stone coal was recovered.
研究领域:
冶金学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 6
·1183
·
IF 3.352
Haibing Jiang,Jiufen Liu,Huaifa Wang,Runquan Yang,Wenzhi Zhao,Duo Yang,Song Yin,Liang Shen
Foam is essential in the flotation process. However, the gas–liquid–solid three-phase froth produced in the flotation process has very strong stability and is difficult to burst spontaneously. The existence of these froths will reduce the transport capacity of the pulp and affect the working efficiency of subsequent processes, such as filtration of the flotation concentrate. In this study, a new defoaming device is designed by combining mechanical impact with depressurized defoaming and its defoaming mechanism is analyzed theoretically. In addition, the liquid level height and pulp overflow method are applied to characterize the defoaming efficiency of the new defoaming device. The effects of impeller structure, pressure drop, impeller rotation frequency, and aeration rate on defoaming efficiency were studied. The results show that when increasing the pressure drop, the defoaming increases, but it will also enhance the generation of bubbles. The efficiency of combined mechanical–vacuum defoaming technology is superior under low-pressure drop using an SC impeller. Under −1 kpa vacuum condition, it only takes 168 s to eliminate 20 cm flotation froth height with combined mechanical impact, while it takes 453 s under ambient pressure, indicating that under vacuum conditions, the mechanical-defoaming method can significantly improve the defoaming efficiency, and the two have a certain synergistic effect.Keywords:coal;flotation froth;defoaming;vacuum
研究领域:
矿业工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PLoS One
·
2024
·Vol. 19
·期 9
·e0309237
·
IF 2.9
Ruchika Kishor Jain,Anshumali,Prasad Sherekar,Amit Nayak,Shraddha Jaiswal,Komal Pimpalghare,Rajani Tumane,Aruna Jawade,Shubhangi Kailas Pingle,Sanvidhan G. Suke,Rajpal Singh Kashyap,Bibhuti Bhusan Mandal
Introduction
Information on bioavailable Iron (BAI) content in respirable coal dust (RCD) is crucial to address occupational health and safety, especially in preventing coal workers’ pneumoconiosis (CWP).
Materials and methods
In the present study, we determined BAI concentrations in seventy-seven coal samples collected from ten coal mining regions of Central India. The cytotoxic potential of BAI-RCD was established invitro by using alveolar epithelial (A549) and macrophage (U937) cell lines. The oxidative/antioxidant status, inflammations, and genotoxicity attributed to BAI-RCD exposure were evaluated and correlated with CWP pathophysiology.
Results
The mean BAI concentrations in the coal samples (n = 77) range from (275 to 9065 mg kg -1 ) and showed wide variability. Both cell lines were exposed to low (275 mg kg -1 ), moderate (4650 mg kg -1 ), and high (9065 mg kg -1 ) BAI-RCD samples showed significant ( p < 0.001) cytotoxicity in a dose-dependent manner (low < moderate < high) compared to the control. After BAI-RCD treatment, both cell lines showed a decrease in antioxidant stress measures (SOD, CAT, and GSH) and a significant ( p < 0.001) increase in oxidative stress parameters (NADPH, MPO, LPO, and PC). Furthermore, these cell line models demonstrated a statistically significant ( p < 0.001) dose-dependent increase in cytokines (TGF-β1, IL-1β, TNF-α, MCP-1, and IL-6 cytokines) and oxidative DNA damage marker (8-OH-dG).
Conclusion
Results indicated that the central India coals (even at low BAI content) may be accountable for inflammatory responses and cytotoxicity. Hence, BAI can be important characteristic to establish safety standards for coal dust exposure before active mining.
研究领域:
职业健康与安全
·
毒理学
·
环境科学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 14
·2044
·
IF 4.7
Xu Li,Yang Liu,Mingyi Li,Sitong Zhang,Lan Jia,Fengbo Zhu,Wenwen Yu
This study aims to provide a high-value and environmentally friendly method for the application of coal-based solid waste. Modified fly ash/polyurethane (MFA/PU) and modified coal gangue powder/polyurethane (MCG/PU) composites were prepared by adding different contents of MFA and MCG (10%, 20%, 30%, 40%). At the filler content of 30%, the compressive strengths of MFA/PU and MCG/PU are 84.1 MPa and 46.3 MPa, respectively, likely due to an improvement in interface compatibility, as indicated by scanning electron microscopy (SEM). The MFA/PU and MCG/PU composites present their highest limiting oxygen index (LOI) values of 29% and 23.5%, respectively, when their filler content is 30%. MFA has advantages in improving the LOIs of composites. Cone calorimetry (CCT) and SEM demonstrate that the two composites exhibit similar condensed-phase flame-retardant behaviors during combustion, which releases CO2in advance and accelerates the formation of a dense barrier layer. Compared with the MFA/PU composites, the MCG/PU composites could produce a more stable and dense barrier structure. Water quality tests show that heavy metals do not leak from FA and CG embedded in PU. This work provided a new strategy for the safe and high-value recycling of coal-based solid waste.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）