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通过钒钛磁铁矿精矿直接还原实验,研究了不同还原剂和添加剂对还原过程金属铁颗粒长大的影响.提高还原温度能促进还原产物中金属铁颗粒的长大,金属铁颗粒中V含量也显著增加.与用无烟煤和褐煤还原产物相比,用烟煤还原产物中金属铁颗粒明显长大,这是由烟煤中高灰分含量所引起的.金属铁颗粒长大机理的研究表明:Na2CO3和Na2SiO3的熔点较低,且能破坏铁橄榄石和铁尖晶石的结构,并生成一些低熔点物质,而SiO2能与铁橄榄石形成低共熔混合物.这些低熔点物质都有助于改善金属铁相的扩散,从而促进金属铁颗粒长大.
The effect of different reducing agents and additives on the growth of metallic iron particles during reduction was studied by the direct reduction experiments of vanadium-titanium magnetite concentrate. Increasing the reduction temperature can promote the growth of metallic iron particles in the reduced product, Content is also significantly increased.Compared with anthracite and lignite reduction products, with the bituminous coal reduction products significantly increased metal iron particles, which is caused by the high ash content of bituminous coal.Studies on the mechanism of growth of metal iron particles: Na2CO3 and Lower melting point of Na2SiO3, and can destroy the structure of fayalite and iron spinel, and generate some low melting point substances, and SiO2 can form a eutectic mixture with fayalite.These low melting point substances are helpful to improve the metal iron Phase of the proliferation, thereby promoting the growth of metal iron particles.