Study on Accelerated Weathering System of Coal Gangue Aggregate

Abstract

Abstract: Three kinds of original coal gangue from different emission places were taken as the research object, and the dry-wet cycle, freeze-thaw cycle and disintegration resistance test were used to accelerate the weathering of coal gangue aggregate, aiming to study the weathering characteristics of coal gangue. The weathering characteristics of coal gangue aggregate were characterized by the mass loss rate and crushing value index after accelerated weathering. The effects of accelerated weathering system, particle size and service state on the weathering characteristics of coal gangue aggregate were studied. At the same time, the weathering mechanism of coal gangue was revealed by XRD, SEM and EDS. The results show that the mass loss rate and crushing value index of coal gangue aggregate obtained by accelerated weathering of dry-wet cycle are closest to coal gangue aggregate weathered for 180 d under natural state. Moreover, the larger the particle size of coal gangue aggregate, the more likely it is to be weathered, and the weathering of coal gangue aggregate is not obvious under service state. The microscopic test results show that the weathering mechanism of coal gangue is that the mineral composition and structure inside the coal gangue are destroyed during the weathering process, resulting in disintegration and shedding, while the coal gangue in the service state can effectively reduce its weathering due to the encapsulation of cementitious materials.

Key words: coal gangue, weathering characteristic, service state, dry-wet cycle, natural weathering

CLC Number:

U414

GONG Tiantian, CHEN Xiao, ZHANG Yanjun, CHEN Zhijun, WANG Wenjun, ZHOU Mingkai. Study on Accelerated Weathering System of Coal Gangue Aggregate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3252-3261.

References

[1] JABŁOŃSKA B, KITYK A V, BUSCH M, et al. The structural and surface properties of natural and modified coal gangue[J]. Journal of Environmental Management, 2017, 190: 80-90.
[2] 徐培杰, 朱毅菲, 曹永丹, 等. 煤矸石资源高值化利用研究进展[J]. 环境工程学报, 2023, 17(10): 3137-3147.
XU P J, ZHU Y F, CAO Y D, et al. Research progress of high-value utilization of coal gangue resources[J]. Chinese Journal of Environmental Engineering, 2023, 17(10): 3137-3147 (in Chinese).
[3] 葛洁雅, 朱红光, 李宗徽, 等. 煤矸石粗骨料-地聚物混凝土的力学与耐久性能研究[J]. 材料导报, 2021, 35(增刊2): 218-223.
GE J Y, ZHU H G, LI Z H, et al. Study on mechanics and durability of coal gangue coarse aggregate-geopolymer concrete[J]. Materials Reports, 2021, 35(supplement 2): 218-223 (in Chinese).
[4] GAO W C, ZHANG X L, DU G Z, et al. Shrinkage model for concrete incorporating coal gangue coarse and fine aggregates[J]. Journal of Building Engineering, 2023, 80: 107865.
[5] QUEROL X, IZQUIERDO M, MONFORT E, et al. Environmental characterization of burnt coal gangue banks at Yangquan, Shanxi Province, China[J]. International Journal of Coal Geology, 2008, 75(2): 93-104.
[6] STRACHER G B, TAYLOR T P. Coal fires burning out of control around the world: thermodynamic recipe for environmental catastrophe[J]. International Journal of Coal Geology, 2004, 59(1-2): 7-17.
[7] WU, YU Y G, HU X Y, et al. Experimental study of the effects of stacking modes on the spontaneous combustion of coal gangue[J]. Transactions of The Institution of Chemical Engineers. Process Safety and Environmental Protection, 2019, 123: 39-47.
[8] YANG F L, YUN Y, LI G K, et al. Heavy metals in soil from gangue stacking areas increases children health risk and causes developmental neurotoxicity in zebrafish larvae[J]. The Science of the Total Environment, 2021, 794: 148629.
[9] TRECHERA P, MORENO T, CÓRDOBA P, et al. Comprehensive evaluation of potential coal mine dust emissions in an open-pit coal mine in Northwest China[J]. International Journal of Coal Geology, 2021, 235: 103677.
[10] QIN L, GAO X. Properties of coal gangue-Portland cement mixture with carbonation[J]. Fuel, 2019, 245(1): 1-12.
[11] 罗畅, 刘萍, 贾毅超, 等. 煤矸石综合利用知识图谱可视化分析[J]. 化工矿物与加工, 2022, 51(9): 1-5.
LUO C, LIU P, JIA Y C, et al. Visual analysis of mapping knowledge domains for comprehensive utilization of coal gangue[J]. Industrial Minerals & Processing, 2022, 51(9): 1-5 (in Chinese).
[12] 张吉雄, 张强, 周楠, 等. 煤基固废充填开采技术研究进展与展望[J]. 煤炭学报, 2022, 47(12): 4167-4181.
ZHANG J X, ZHANG Q, ZHOU N, et al. Research progress and prospect of coal based solid waste backfilling mining technology[J]. Journal of China Coal Society, 2022, 47(12): 4167-4181 (in Chinese).
[13] 杨科, 魏祯, 赵新元, 等. 黄河流域煤电基地固废井下绿色充填开采理论与技术[J]. 煤炭学报, 2021, 46(增刊2): 925-935.
YANG K, WEI Z, ZHAO X Y, et al. Theory and technology of underground green filling mining of solid waste in coal-fired power base of the Yellow River Basin[J]. Journal of China Coal Society, 2021, 46(supplement 2): 925-935 (in Chinese).
[14] ZHANG Y N, MA G D, LIU Y. Mix design for thermal insulation concrete using waste coal gangue as aggregate[J]. Materials Research Innovations, 2015, 19(S5): S5-878-S5-884.
[15] ZHOU M L, DOU Y W, ZHANG Y Z, et al. Effects of the variety and content of coal gangue coarse aggregate on the mechanical properties of concrete[J]. Construction and Building Materials, 2019, 220(30): 386-395.
[16] GARCI A R, FRIAS M, ARRIBAS I, et al. Freeze-thaw effect on the durability of binary cements containing activated coal-mining waste[J]. Construction and Building Materials, 2018, 190(30): 140-149.
[17] WANG Z S, ZHAO N. Properties of steel fiber reinforced coal gangue coarse aggregate concrete[J]. Wuhan University Journal of Natural Sciences, 2014, 19(3): 262-268.
[18] 何文波. 煤矸石粗骨料混凝土性能研究[D]. 泰安: 山东农业大学, 2017: 3-7.
HE W B. Study on properties of coal gangue coarse aggregate concrete[D].Taian: Shandong Agricultural University, 2017: 3-7 (in Chinese).
[19] WANG J M, QIN Q, HU S J, et al. A concrete material with waste coal gangue and fly ash used for farmland drainage in high groundwater level areas[J]. Journal of Cleaner Production, 2016, 112: 631-638.
[20] 陈岩. 基于多元化应用的煤矸石高效破碎分选技术研究[D]. 武汉: 武汉理工大学,2015: 1-5.
CHEN Y. Research on efficient crushing and separation technology of coal gangue based on diversified application[D]. Wuhan University of Technology, 2015: 1-5(in Chinese).
[21] MINYARD M L, BRUNS M A, LIERMANN L J, et al. Bacterial associations with weathering minerals at the regolith-bedrock interface, luquillo experimental forest, Puerto Rico[J]. Geomicrobiology Journal, 2012, 29(9): 792-803.
[22] FANTONG W, KAMTCHUENG B T, YAMAGUCHI K, et al. Characteristics of chemical weathering and water-rock interaction in Lake Nyos Dam (Cameroon): implications for vulnerability to failure and re-enforcement[J]. Journal of African Earth Sciences, 2015, 101: 42-55.
[23] PINYOL N, VAUNAT J, ALONSO E E. A constitutive model for soft clayey rocks that includes weathering effects[J]. Géotechnique, 2007, 57(2): 137-151.
[24] 黄方意, 徐江. 煤矸石风化试验研究及风化对煤矸石地基的影响[J]. 四川建筑, 2004, 24(1): 61-62.
HUANG F Y, XU J. Experimental study on weathering of coal gangue and its influence on coal gangue foundation[J]. Sichuan Architectural, 2004, 24(1): 61-62 (in Chinese).
[25] 祁星鑫, 王晓军, 黎艳, 等. 新疆主要煤区煤矸石的特征研究及其利用建议[J]. 煤炭学报, 2010, 35(7): 1197-1201.
QI X X, WANG X J, LI Y, et al. Study on properties of the coal gangues from Xinjiang main coal mine regions and their utilization suggestions[J]. Journal of China Coal Society, 2010, 35(7): 1197-1201 (in Chinese).
[26] 张雁, 孟凡凤, 郭利勇, 等. 煤矸石的风化性质对公路路用性能的影响[J]. 煤炭工程, 2011, 43(12): 94-96.
ZHANG Y, MENG F F, GUO L Y, et al. Influence of weathering properties of coal gangue on road performance[J]. Coal Engineering, 2011, 43(12): 94-96 (in Chinese).
[27] 秦俊梅, 白中科, 马祥爱, 等. 煤矸石自然风化及人工模拟风化过程中盐分及pH值的动态变化: 以平朔露天矿区为例[J]. 土壤通报, 2007, 38(4): 649-652.
QIN J M, BAI Z K, MA X A, et al. The dynamic change in total salt and ph value of coal waste rock in the process of nature and man-made simulation weathering: taking pingshuo opencast mine area as an example[J]. Chinese Journal of Soil Science, 2007, 38(4): 649-652 (in Chinese).
[28] 张清峰, 王东权, 于广云, 等. 煤矸石风化对其物理力学性能影响的研究[J]. 中国矿业大学学报, 2019, 48(4): 768-774.
ZHANG Q F, WANG D Q, YU G Y, et al. Research on the effect of weathering on physical and mechanical properties of coal gangue[J]. Journal of China University of Mining & Technology, 2019, 48(4): 768-774 (in Chinese).
[29] 严家平, 陈孝杨, 蔡毅, 等. 不同风化年限的淮南矿区煤矸石理化性质变化规律[J]. 农业工程学报, 2017, 33(3): 168-174.
YAN J P, CHEN X Y, CAI Y, et al. Physicochemical property change regularities of coal gangue with different weathering ages in Huainan minging area[J]. Transactions of the Chinese Society of Agricultural Engineering, 2017, 33(3): 168-174 (in Chinese).
[30] 陈潇, 杜新宇, 张嘉琛, 等. 一种服役状态下煤矸石集料风化的快速检测方法及其应用: CN114563339A[P]. 2022-05-31.
CHEN X, DU X Y, ZHANG J C, et al. A rapid detection method for weathering of coal gangue aggregates in service state and its application: CN114563339A[P]. 2022-05-31 (in Chinese).
[31] 郭义. 香溪河岸坡粉砂岩干湿循环损伤机理试验研究[D]. 武汉: 中国地质大学(武汉), 2013.
GUO Y. Experimental study on damage mechanism of siltstone on Xiangxi River bank slope under dry-wet cycle[D].Wuhan: China University of Geosciences, 2013 (in Chinese).
[32] 郭海桥, 程伟, 尚志, 等. 水分和冻融循环对酷寒矿区煤矸石风化崩解速率影响的定量研究[J]. 煤炭学报, 2019, 44(12): 3859-3864.
GUO H Q, CHENG W, SHANG Z, et al. Quantitative determination of the effect of moisture and freeze/thaw cycles on coal gaugue decay rate in severe cold mining areas[J]. Journal of China Coal Society, 2019, 44(12): 3859-3864 (in Chinese).
[33] 张振华, 钱明明, 姚华彦, 等. 一种干湿交替和应力共同作用的岩石崩解试验装置及试验方法: CN106289993B[P]. 2023-07-07.
ZHHANG Z H, QIIAN M M, YAAO H Y, et al. A rock disintegration test device and test method under the combined action of dry-wet alternation and stress: CN106289993B[P]. 2023-07-07 (in Chinese).
[34] 王浪, 邓辉, 邓通海, 等. 泥岩耐崩解性和颗粒粒径相关性的试验研究[J]. 长江科学院院报, 2017, 34(8): 120-124.
WANG L, DENG H, DENG T H, et al. Correlation between disintegration resistance and particle size of mudstone[J]. Journal of Yangtze River Scientific Research Institute, 2017, 34(8): 120-124 (in Chinese).
[35] 李蒙, 蒋盛, 张孙玄琦, 等. “球状风化物” 成因国内外研究现状[J]. 地下水, 2015, 37(1): 251-253.
LI M, JIANG S, ZHANG S, et al. Research status of the causes of “spherical weathering” at home and abroad[J]. Ground Water, 2015, 37(1): 251-253 (in Chinese).
[36] 姚志鑫, 穆川川, 单俊鸿, 等. 基于裹浆工艺的煤矸石混凝土性能研究[J]. 硅酸盐通报, 2023, 42(2): 587-597.
YAO Z X, MU C C, SHAN J H, et al. Performance of coal gangue concrete based on slurry wrapping technology[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(2): 587-597 (in Chinese).