Micro-properties of Molding Products between Modified Corn Stalk and Pulverized Coal

Document Type : Original Article


1 School of chemistry and chemical engineering, Yulin University, Yulin City, Shaanxi Province,China

2 Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization,Yulin, Shannxi, China

3 National Coal and Salt Chemical Product Quality Supervision and Inspection Center,Yulin, Shannxi, China


Taking Shanxi fat coal, Shanxi 4# coke coal and Shenmu low rank pulverized coal as raw materials, three different concentrations of NaOH modified corn stalk were used as binder.  The effect of changing NaOH concentrations and coal particle size used in moulding briquette and formed coke on its SEM micrographs, combustion property and FTIR absorption strength were investigated. The micro-properties of corn stalk before and after modification was also discussed.  Results showed that the moisture content and ash yield of modified corn stalk increased obviously and the volatile yield showed opposite trend. 2.0% NaOH modified corn stalk showed more voids or porosity which could wrap a large number of coal particles to form strong strength briquette. Addition of modified corn stalk could reduces the briquette burning time and increased burning rate with strong flame and good ignition. From SEM micrograph, briquette had rough surface, and different sizes coal particles and fiber were bound together firmly. Formed coke showed light gray metallic luster, light mass, obvious circular holes and small gaps among particles.The melting colloid and binder could better infiltrate and encapsulate coal particles to form a dense and impermeable entity, which blocked the channels of organic group decomposition during pyrolysis process. Thus, it is forming many holes of different sizes on the surface and inside formed coke. The infrared spectrum of formed coke was simplier than briquette, and the absorption peak number was less and absorption strength was weaker also.


Main Subjects

1.     Minggao, Q.I.A.N., 2017. Efforts to be made to achieve the transition of Chinese coal industry from quantity to quality. China Coal, 43(7): 5-9.
2      Wu, W., Mo, R. and Wang, Z., 2002. Occurrence Features and Geological Work of Gemanium Resource in Yimin Coalfield, Inner Mongolia [J]. Geology of Inner Mangolia, 1: 618-628.
3      Baoqi, M., Xiongwei, L., 2014. The Developing Trend of China's semi-coke industry [J]. Coal Processing and Comprehensive Utilization, 4: 22-26.
4      Zhang, Q., Yang, J., 2013. developing carbon industry in Yulin[J]. Industrial& Science Tribune,8: 61-62.
5      Lela, B., Barišić, M. and Nižetić, S., 2016. Cardboard/sawdust briquettes as biomass fuel: Physical–mechanical and thermal characteristics. Waste Management, 47: 236-245.
6.     Thabuot, M., Pagketanang, T., Panyacharoen, K., Mongkut, P. and Wongwicha, P., 2015. Effect of applied pressure and binder proportion on the fuel properties of holey bio-briquettes. Energy Procedia, 79: 890-895.
7.     Gao, P., Zhou, Y., Meng, F., Zhang, Y., Liu, Z., Zhang, W. and Xue, G., 2016. Preparation and characterization of hydrochar from waste eucalyptus bark by hydrothermal carbonization. Energy, 97: 238-245.
8.     Syafrudin, S., Zaman, B., Indriyani, I., Erga, A.S. and Natalia, H.B., 2015. The Utilization of Bottom Ash Coal for Briquette Products by Adding Teak Leaves Charcoal, Coconut Shell Charcoal, and Rice Husk Charcoal. Waste Technology, 3(1): 14-21.
9.     Akuma, O. and Charles, M., 2017. Characteristic Analysis of Bio-coal Briquette (Coal and Groundnut Shell Admixtures). International Journal of Scientific Research in Science and Technology, 2(3): 30-38.
10.  Jhadav, P.V., Dashore, S. and Chaudhary, K., 2016. Biomass Briquette System: Pollution Free Thermal Energy Resources. International Journal of Innovative Research in Science, Engineering and Technology, 5(1): 1165-1171.
11.  Xinfu, H., Lei, Y., Hongju, W., Jianguo, W. and Anning, Z., 2016. Study on pyrolysis characteristics of bio-briquette. Coal Science and Technology, 9: p.33-39.
12.  Juan, C., Hao, L., Jian, L., Zhifang, Z. and Xiaohui, B., 2017. Research on corn stalk briquette binder of low metamorphic pulverized coals. China Coal, 4: 33-37.
13.  Huang, G.X., Chen, L.J. and Cao, J., 2008. Briquetting mechanism and waterproof performance of bio-briquette. Journal of China Coal Society, 33(7): 812-815.
14.  Chen, L.J., Chai, Y.Y. and Zhu, Z.H., 1997. Study of micro-structure of briquette. Journal of China Coal Society, 22(3): 304-307.
15.  Lanying, P., 2009. An experimental study on using slime and crops’ straw to produce bio-briquette. China Coal, 1: 61-63.
16.  Zheng, L., Dang, Z., Yi, X. and Zhang, H., 2010. Equilibrium and kinetic studies of adsorption of Cd (II) from aqueous solution using modified corn stalk. Journal of hazardous materials, 176(1-3): 650-656.
17.  Demirbaş, A., 1999. Properties of charcoal derived from hazelnut shell and the production of briquettes using pyrolytic oil. Energy, 24(2): 141-150.
18.  Xiang, L.I., Qin, Z.H., Bu, L.H., Zhuang, Y.A.N.G. and Shen, C.Y., 2016. Structural analysis of functional group and mechanism investigation of caking property of coking coal. Journal of Fuel Chemistry and Technology, 44(4): 385-393.
19.  Feng J., Li, W.Y., Xie, K.C., 2002. Research on coal structure using FT-IR. Journal of China University of Mining & Technology, 31(5): 362-366.
20.  Jones, J.M., Pourkashanian, M., Rena, C.D. and Williams, A., 1999. Modelling the relationship of coal structure to char porosity. Fuel, 78(14): 1737-1744.
21.  Blesa, M.J., Miranda, J.L., Moliner, R., Izquierdo, M.T. and Palacios, J.M., 2003. Low-temperature co-pyrolysis of a low-rank coal and biomass to prepare smokeless fuel briquettes. Journal of Analytical and Applied Pyrolysis, 70(2): 665-677.
22.  Zhijian, G., Xiao, M., and Ying, J., 2011. Optimization in selection of raw materials and binder for mould coke. Coal Processing & Comprehensive Utilization, 6: 15-18.
23.  Li, J., Yang, J. and Liu, Z., 2008. Hydro-treatment of a direct coal liquefaction residue and its components. Catalysis Today, 130(2-4): 389-394.
24.  Soncini, R.M., Means, N.C. and Weiland, N.T., 2013. Co-pyrolysis of low rank coals and biomass: Product distributions. Fuel, 112: 74-82.
25.  Li, J.G., Fang, Y.T., Zhang, Y.Q., Li, C.Y. and Wang, Y., 2008. Property of char from fast pyrolysis of direct coal liquefaction residue. Journal Fuel Chemistry Technology, 36(3): 273-278.
26.  Wang, Y.F., Gao, J.S., Wu, C.L., Wu, D. and Xu, Y., 2000. Study on coking mechanism of anthracite formed coke. Journal of Fuel Chemistry and Technology, 28(3): 216-220.
27.  Li, Y., Tang, X., 2001. Research factors affected to strength of coke. Coal Science and Ttechnology,4: 23-26.