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含氟是包头铁矿的主要特征.自熔性烧结矿的胶结相主要由枪晶石和玻璃体所组成,两者的机械强度都较低,对磁铁矿的相对胶结强度也较小.并且胶结相的熔体粘度低,表面张力小,致使冷却时形成多孔薄壁结构.因此,烧结矿的强度很差.随着碱度的提高,当碱度为1.6～2.4时,由于碱度的增加,铁酸钙也大为增加,成为烧结矿的主要胶结相,它一方面具有较好的机械强度,另方面对磁铁矿又有较大的胶结强度,与磁铁矿形成交织与熔蚀结构,所以高碱度烧结矿的强度得到显著提高.可见,铁酸钙有效地抑制了氟对烧结矿强度的破坏作用.
Fluorine is the main feature of Baotou Iron Mine.The cemented phase of self-fluxing sinter is mainly composed of gunsolite and vitreous, both of which have lower mechanical strength and less relative cementation strength to magnetite, The phase of the melt viscosity is low, the surface tension is small, resulting in the formation of porous thin-walled cooling structure, therefore, the strength of sinter is poor with the alkalinity increased, when the alkalinity of 1.6 to 2.4, due to an increase in alkalinity , Calcium ferrite also greatly increased, become the main cemented sinter phase, which on the one hand has better mechanical strength, on the other hand on the magnetite have a greater cementation strength, and the formation of magnetite interlacing and corrosion Structure, so the strength of high alkalinity sinter has been significantly improved.It can be seen that calcium ferrite effectively inhibits the destructive effect of fluorine on the strength of sinter.