摘要:
以经典工艺矿物学研究方法为基础，结合化学物相分析、MLA、X射线衍射、光学显微镜、SEM-EDS等手段对印尼典型海砂矿的矿物学及其固态还原特征进行了系统研究。结果表明：印尼海砂矿的矿物组成主要为钛磁铁矿、次为少量假象赤铁矿、赤铁矿、钛铁矿以及辉石等。绝大部分钛磁铁矿呈致密单体或铁的富连生体产出，偶有由固熔体分离析出形成的微细钛铁矿片晶。赋存于钛磁铁矿中的铁占总铁的89.79％、钛为85.42％、钒则高达97.97%。海砂矿在mol(C/Fe)=1.2、温度1300 oC条件下还原60min可较好实现金属化。其还原历程遵循：Fe2.75Ti0.25O4 → FeTiO3, (Fe,Mg)Ti2O5 → (Fe,Mg)Ti2O5 → Fe，稳定的黑钛石相是影响金属化程度的主要因素。经固态还原处理Fe元素最终富集于金属相，V、Ti则赋存于渣中富钛相，为后续的分离提取创造了有利条件。
Abstract:
Based on the classical process mineralogy method, combined with chemical phase analysis, MLA, X-ray diffraction, particle size analysis, optical microscopy, SEM-EDS, etc., the mineralogy and reduction characteristics of typical ironsand from Indonesia were studied. Results show that the mineral composition of ironsand is mainly titanomagnetite, followed by a small amount of pseudo hematite, hematite, ilmenite, pyroxene, plagioclase, etc.. Most of the titanomagnetite exist as compact monomers or iron-rich aggregates, and occasionally fine ilmenite flakes formed by solid-melt separation. The iron contained in titanomagnetite phase accounts for 89.79% of the total iron, titanium and vanadium accounts for 85.42% and 97.97% respectively. The ironsands can achieve high metallization ratio as they are reduced at 1300 oC for 60min with coal proportion of mol(C/Fe)=1.2. The reduction course follows the steps of Fe2.75Ti0.25O4 → FeTiO3, (Fe,Mg)Ti2O5 → (Fe,Mg)Ti2O5 → Fe. The stable anosovite ((Fe,Mg)Ti2O5) phase is the main factor affecting the finsl metallization degree of reduced sample. By solid-state reduction treatment, the Fe element finally enriches in the metal phase, while V and Ti distribute in
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