摘要
本研究探讨了烧成温度对铬铁渣线收缩率、体积密度和抗折强度以及光学性能的影响。并用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)和紫外可见光光谱仪(UV-Vis)进行表征。当烧成温度大于1000℃时,随着烧成温度的升高,由于尖晶石的生成和渣内高温气体的分解,铬铁渣膨胀率增加,体积密度减小。当烧成温度为1250℃时,由于晶体含量的增多以及适宜的液相量产生导致颗粒间大气孔含量减少,铬铁渣的抗折强度达到最高为32 MPa。当烧成温度为1300℃时,铬铁渣出现过烧,导致铬铁渣体积密度和抗折强度明显降低。尖晶石结构中Fe3+的d–d跃迁和Cr3+的4A2(4F)→4T2(4F)和4A2g→4T1g跃迁在460、580和690 nm波长处随着烧成温度的增加吸收增强,导致铬铁渣a*和b*值增加。
Effect of firing temperature on properties of the ferrochromium slag including bulk density,linear shrinkage,flexural strength and optical property were investigated and characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersion spectroscopy(EDS)and ultraviolet-visible spectrophotometer(UV-Vis).With the increase of firing temperature,when the firing temperatures were more than 1000℃,liner expansion of ferrochromium slag was increased leading to decease of bulk density,which were attributed to the expansion effect of the formation of spinel crystals and decomposition of gas in ferrochromium slag.The optimal flexural strength could be obtained when the firing temperature was 1250℃due to the increased amount of crystals and suitable content of liquid phase that resulted in reduction of large pore amounts between particles.The ferrochromium slag was over-heated with the properties of bulk density and flexural stength declined sharply when the firing temperature was 1300℃.With the increase of firing temperature,the intensity of absorption at 460,580 and 690 nm increased due to the presence of d-d transitions of Fe3+,4A2(4F)→4T2(4F)and 4A2g→4T1g of Cr3+in spinel structures leading to a rise in a*and b*values of ferrochromium slag.
作者
邱柏欣
顾幸勇
董伟霞
罗婷
何梦可
吴培艺
Qiu Boxin;Gu Xingyong;Dong Weixia;Luo Ting;He Mengke;Wu Peiyi(Department of Material Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen,Jiangxi,China)
出处
《矿产综合利用》
CAS
北大核心
2020年第1期188-193,162,共7页
Multipurpose Utilization of Mineral Resources
基金
国家自然科学基金(51262014)
国家自然科学基金(51462016)
研究生创新基金(YC2017-S373)资助。
