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Preparation of CaO-containing carbon pellets from coking coal and calcium oxide:Effects of temperature,pore distribution and carbon structure on compressive strength in pyrolysis furnace

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International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1153-1163页

作者： Xiao-min You Xue-feng She Jing-song Wang Qing-guo Xue Ze-yi Jiang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

CaO-containing carbon pellets(CCCP)were successfully prepared from well-mixed coking coal(CC)and calcium oxide(CaO)and roasted at different pyrolysis temperatures.The effects of temperature,pore distribution,and carbon structure on the compressive strength of CCCP was investigated in a pyrolysis furnace(350-750℃).The results showed that as the roasting temperature increased,the compressive strength also increased and furthermore,structural defects and imperfections in the carbon crystallites were gradually eliminated to form more organized char structures,thus forming high-ordered CC.Notably,the CCCP preheated at 750℃exhibited the highest compressive strength.A positive relationship between the compressive strength and pore-size homogeneity was established.A linear relationship between the com-pressive strength of the CCCP and the average stack height of CC was observed.Additionally,a four-stage caking mechanism was developed.

关键词： calcium oxide-containing carbon pellets calcium carbide coking coal compressive strength pyrolysis furnace

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Preparation and performance analysis of a coking coal dust suppressant spray

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International Journal of coal Science & Technology 2021年第5期8卷 1003-1014页

作者： Jiuhong Jiang Pengfei Wang Ye Pei Ronghua Liu Liming Liu Yunchu He School of Resource Environment and Safety EngineeringHunan University of Science and TechnologyXiangtan 411201China Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern coal Mines Hunan University of Science and TechnologyXiangtan 411201China Hunan Jiujiu Environmental Protection Intelligent Co.Ltd Changsha 410000China

coking coal dust is extremely hydrophobic;therefore,combination with droplets in the air is difficult and dust suppression is challenging.Here,a dust suppressant spray for coking coal dust was studied in order to improve of the combination of droplets and coking coal dust.Based on monomer optimization and compounding analysis,two surfactant monomers,fatty alcohol ether sodium sulfate(AES)and sodium dodecyl benzene sulfonate(SDBS)were selected as the surfactant components of the dust suppressant.The surfactant monomers were combined with four inorganic salts and the reverse osmosis moisture absorption of each solution was determined.By combining the reverse osmosis moisture absorption values with the water retention experimental results,CaCl_(2)was identified as the optimal inorganic salt additive for the dust suppressant.Finally,the optimal concentration of each component was obtained using orthogonal experimental design i.e.,AES(0.03%),SDBS(0.05%),and CaCl_(2)(0.4%).The dust suppressant solution formulated using this method had a high moisture absorption capacity and excellent performance.

关键词： coking coal Dust Spray Dust suppressant Surfactant Inorganic salt additive

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High temperature dephosphorus behavior of Baotou mixed rare earth concentrate with carbon

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Journal of Rare Earths 2010年第S1期28卷 194-197页

作者：邢鹏飞李峰郭菁涂赣峰 School of Materials and Metallurgy Northeastern University

Based on the carbothermal reduction technology applied in industry,the dephosphorization behavior of Baotou mixed rare earth concentrate(Baotite) with carbon at high temperature was investigated.The experimental results showed that both the charred coal and the coking coal were effective carbonaceous reductants for the dephosphorization of the Baotite.Among them,the charred coal was more suitable for the dephosphorus due to its high carbon content and lower volatile and ash.When the rare earth pellets,made by pressing the mixture of the Baotite,charred coal and water in mould,were roasted at 1500 oC for 2 h,its dephosphorus rate was as high as 98%.Roasting temperature was a main factor for the dephosphorus rate,and roast time was the second one.The size of both charred coal and coking coal also had influence on the dephosphorus,and was better less than 150 μm.

关键词： Baotou rare earth concentrate dephosphorus charred coal coking coal high temperature particle size

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Optimum active and inert ratios for different metamorphic grade coals

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Baosteel Technical Research 2017年第3期11卷 12-17页

作者： LI Deping WEI Zheng TANG Qin Technology Research Center SG1S Songshan Co. Ltd. Shaoguan 512123 Guangdong China Marketing Center SGIS Songshan Co. Ltd. Shaoguan 512123 Guangdong China

In order to quantitatively describe the difference of optimum active and inert ratio of various metamorphic grade coking coals, the rule of coke micro-strength index （MSI）, determinated by adding different proportions of inert content to ten kinds of single coal, changing with active and inert ratio has been investigated. Three kinds of change rule of the MSI of ten kinds of single coal changing with active and inert ratio have been obtained in the research. It has been demonstrated that Gauss curve model is the optimal model to describe the optimum active and inert ratio of different metamorphic grade coals. On this basis, the optimum active and inert ratio of different metamorphic grade coals can be given.

关键词： metamorphic grade coking coal active and inert ratio Gauss curve

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