乐山地区的磷矿烧结行为  

Behavior of sintering process of phosphorite from Leshan

作　　者：郭恩光[1] 李东海[1] 潘成[1] 刘梅[1] 吕学伟[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《中南大学学报（自然科学版）》2013年第7期2650-2655,共6页Journal of Central South University:Science and Technology

基　　金：霍英东高等院校青年教师基金基础性研究课题(131048)

摘　　要：针对四川乐山地区磷矿烧结问题,进行了原矿的化学成分测定、热重（TG）、差示扫描热分析（DSC）以及X线衍射分析（XRD）。在实验室进行烧结杯实验,对烧结矿烧损、成品率、落下强度、转鼓强度、抗磨指数、P2O5含量进行检测以及XRD分析,研究配碳量和酸度对烧结效果的影响以及烧结矿黏结相的物相组成。研究结果表明：磷矿主要物相为氟磷灰石（Ca5（PO4）3F）、羟磷灰石（Ca5（PO4）3OH）、白云石（CaMgCO3）和石英（SiO2）,其中白云石的分解温度区间为620-800℃;烧结矿性能随着配碳量增加先升高后降低,在配碳量为7%时烧结矿性能最好,添加硅石会恶化烧结矿性能。磷矿烧结矿主要物相为氟磷灰石（Ca5（PO4）3F）,主要黏结相为钙镁黄长石（Ca2MgSi2O7）或者透辉石（CaMgSi2O6）。The chemical analysis,as well as thermogravimetric,differential thermal analysis and X-ray diffraction analysis were carried out for phosphorite concentrate to understand the sintering process of phosphorite from Leshan,Sichuan.The sintering experiment was carried out in a laboratory scale.The mass loss,yield,shatter strength,tumble strength,abrasion index,X-ray diffraction analysis and P2O5 content of phosphorite sinter were detected.The effect of carbon dosage and m（SiO2）/m（CaO） on sinter and the main binder phase of sinter were also studied.The result shows that the main phases of phosphorite concentrate are fluorapatite（Ca5（PO4）3F）,hydroxylapatite（Ca5（PO4）3OH）,dolomite（CaMgCO3） and quartz（SiO2）,the temperature decomposition of dolomite is between 620 ℃ and 800 ℃.The results show that the properties of the sinter improve with increase of the carbon dosage up to 7%,and then drop afterwards.The addition of silica is harmful to the properties of the sinter.The best sinter quality is achieved when carbon dosage is 7% and m（SiO2）/m（CaO） is 0.35;the main phase of phosphorite sinter is fluorapatite（Ca5（PO4）3F） while the main binder phase is fuggerite（Ca2MgSi2O7） or diopside（CaMgSi2O6）.

关 键 词：磷矿 烧结 配碳量 酸度 黏结相 

分 类 号：TQ11[化学工程—无机化工]