In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder w...In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder was investigated.Results indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved shape.In addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,respectively.Finally,the influence of OCB on the properties of pellets was investigated.The compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.展开更多
A new process for manufacturing organically compounded bentonite was devcloped successfully based on the organic intercalation andlayered structure of bentonitc.The main steps in the proposed process included wet sodi...A new process for manufacturing organically compounded bentonite was devcloped successfully based on the organic intercalation andlayered structure of bentonitc.The main steps in the proposed process included wet sodium activation of bentonite ore,organic com-pounding and high-pressure roll grinding.The optimum procedure is recommended as follows:5 mass%of sodium carbonate powderand 30 wt.%water are added to activate the bentonite ore for 24 h to prepare activated bentonice;0.5 wt.%of organic molecules are adiedinto the activated bentonite for organic compounding for 12 h:then,the high-pressure rollgrinding is followed to treat the organicallycompounded bentonice;:and finally,drying and fine prinding are performed for prenaring the final organically compounded bentoniteprodiuct with 10 wt.%moisture and 98% passing 0.074 mm.The obtained organically compounded bentonite was characterized usingan X-ray diffractometer,a scanning electron microscope and anX-ray photoelectron spectrometer.To confirm the effect of organicallycompounded bentonite on green balls,the pelletizing tests were carried out.The rexsults showed that high-pressure roll grinding can notonly enhance the ability of the crystal layer to hold the combined water.but also strengthen the intercalation compounding of the organicadditive,which is beneficial for the formation of a fiber-interlaced structure of the organically compounded bentonite and improvesthe quality index of the bentonite itself.Also,the organically compounded bentonite is helpiul to improve the indexes of green balls.展开更多
基金This work was financially supported by the National Nat-ural Science Foundation of China(No.51874025)the Na-tional Key R&D Program of China(No.2017YFB0304302-01)the Fundamental Research Funds for the Central Universities,China(No.FRF-NP-19-004).
文摘In the ironmaking process,the addition of an organic binder to replace a portion of bentonite has the potential to improve the per-formance of pellets.The interaction between original bentonite(OB)and organic binder was investigated.Results indicated that the micromor-phology of organic composite bentonite(OCB)became porous and the infrared difference spectrum exhibited a curved shape.In addition,the residual burning rates of OB and organic binder were determined to be 82.72%and 2.30%,respectively.Finally,the influence of OCB on the properties of pellets was investigated.The compressive strength of OCB-added green pellets(14.7 N per pellet)was better than that of OB-ad-ded pellets(10.3 N per pellet).Moreover,the range of melting temperature of OCB-added green pellets(173℃)was narrower than that of OB-added pellets(198℃).The compressive strength of OCB-added green pellets increased from 2156 to 3156 N per pellet with the increase in roasting temperature from 1200 to 1250℃.
基金The authors wish to express thanks to NationalNatural Science Foundation of China(No.5147416l)Innovation-driven Project of Guangxi Zhuang Autonomous Region(Nos.AA18242003 and AA148242003)。
文摘A new process for manufacturing organically compounded bentonite was devcloped successfully based on the organic intercalation andlayered structure of bentonitc.The main steps in the proposed process included wet sodium activation of bentonite ore,organic com-pounding and high-pressure roll grinding.The optimum procedure is recommended as follows:5 mass%of sodium carbonate powderand 30 wt.%water are added to activate the bentonite ore for 24 h to prepare activated bentonice;0.5 wt.%of organic molecules are adiedinto the activated bentonite for organic compounding for 12 h:then,the high-pressure rollgrinding is followed to treat the organicallycompounded bentonice;:and finally,drying and fine prinding are performed for prenaring the final organically compounded bentoniteprodiuct with 10 wt.%moisture and 98% passing 0.074 mm.The obtained organically compounded bentonite was characterized usingan X-ray diffractometer,a scanning electron microscope and anX-ray photoelectron spectrometer.To confirm the effect of organicallycompounded bentonite on green balls,the pelletizing tests were carried out.The rexsults showed that high-pressure roll grinding can notonly enhance the ability of the crystal layer to hold the combined water.but also strengthen the intercalation compounding of the organicadditive,which is beneficial for the formation of a fiber-interlaced structure of the organically compounded bentonite and improvesthe quality index of the bentonite itself.Also,the organically compounded bentonite is helpiul to improve the indexes of green balls.
