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Large amounts of Ca-rich or Fe-rich solid wastes, such as tailing, red mud, metallurgical slag and fly ash, have still not been efficiently utilized in the world. Steel making slag is a typical solid waste with high content of calcium and iron components. In China, 101 million tons steel slag were produced in 2013, with only 22% reused, and the stockpile of steel slag has been accumulated to more than 400 million tons.1) Such solid wastes have generated crucial problems for environment, because they not only occupy enormous land but also cause various pollutions to groundwater and soil.2) It is of urgency to find solutions of technical and financial feasibility to minimize the impacts of such solid wastes on the environment and also convert them to useful materials. Steel slag mainly consists of CaO, Fe2O3, SiO2, Al2O3, MgO, MnO and P2O5. There are a number of steel slag utilization methods, which are directed to the use of certain components or characteristic in steel slag, such as utilization in steel enterprise interior (for waste steel and CaO), utilization for production of cement and concrete (for CaO and SiO2), utilization for materials of waste water treatment Effects of CaO and Fe2O3 on the Microstructure and Mechanical Properties of SiO2–CaO–MgO–Fe2O3 Ceramics from Steel Slag

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Effects of CaO and Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; on the Microstructure and Mechanical Properties of SiO&lt;sub&gt;2&lt;/sub&gt;–CaO–MgO–Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Ceramics from Steel Slag