XRD分析菱镁石矿煅烧制备的镁砂中杂质组成

摘要

Using the X-ray diffraction(XRD)technology,analysed the compositiog of the magnetite ore and the magnesite clinker. The result showed that the mass fraction of original MgCO3 in the magnetite ore has reached 96%(wt) and the impurities are mainly CaCO3 and Si()2. MgCO3 in light-burned magnesia has been largely decomposed to MgO with 32%(wt)of MgCO3 left to form new trace phase of CaMg(CO3)2 and Mg(()H)2 in the low-temperature calcination. MgCO3 in dead-burned magnesia has been completely decomposed into MgO coupling with the release of carbonyl which may exist in light-burned magnesia and the impurities are mainly Mg2Si04 and CaOCabout 7%(wt)of the total). The result will be the reference for reforming purification process to improve the quality of magnesia by calcining magnesite.%采用X射线衍射技术(XRD)对菱镁原矿和镁砂产品进行了物相组成分析,菱镁石原矿粉中主相ω( MgCO3)达到96％,杂质主要是CaCO3和SiO2；轻烧镁砂中的MgCO3大部分已经分解为MgO,但还有质量分数32％的MgCO3未分解,并在低温煅烧的情况下生成了微量的新相CaMg(CO3)2和Mg(OH)2；重烧镁砂中的MgCO已经完全分解为MgO,而且轻烧产物中存在的羰基相的羰基也已经完全脱出,杂质主要存在形式是Mg2SiO4和CaO,约占总质量的7％.其结果将成为提高菱镁矿煅烧生产的镁砂品质而改进提纯工艺的参考依据.