论文部分内容阅读
烧结矿中MgO主要分布于铁相中与赤铁矿和富士体固溶形成镁质赤铁矿和镁质富士体,Mg2+在硅酸盐粘结相中的固溶量很低。试验采用白云石-Fe2O3扩散偶,并通过光学显微镜、电子探针等手段分析考察了白云石中MgO及CaO对赤铁矿的扩散行为及MgO的扩散速度。试验结果表明:CaO在Fe2O3中的扩散形成CaO.Fe2O3和CaO.2Fe2O3等低熔点物质促进了白云石与Fe2O3间扩散,CaO扩散量大于MgO的扩散量,并求得MgO在Fe2O3中的扩散速度为17.2μm/min。
Sinter MgO is mainly distributed in the iron phase with hematite and Fuji solid solution to form magnesian hematite and magnesian fuji, Mg2 + in the silicate binder phase in the low amount of solid solution. The dolomite-Fe2O3 diffusion couple was used to investigate the diffusion behavior of MgO and CaO on hematite and the diffusion speed of MgO in dolomite by optical microscope and electron probe. The results show that CaO diffuses in Fe2O3 to form CaO. Low melting point materials such as Fe2O3 and CaO.2Fe2O3 promote the diffusion between dolomite and Fe2O3, and the diffusion of CaO is larger than that of MgO, and the diffusion speed of MgO in Fe2O3 17.2 μm / min.