melted, cooled and broken, and then partitioned into different particle sizes. It features uniform composition, low melting point, fast melting speed and less impurities. It can help shorten smelting time to rapidly form slag, improve kinetic conditions for desulfurization, enhance desulfurization effect and reduce alloy consumption in deoxidation and alloying process, thereby decreasing dust pollution in smelting process. See the following table for physical and chemical indexes of refining slag