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首页> 外文期刊>ISIJ international >Incorporation of Chlorine in a Secondary Steelmaking Slag Based on the CaO-Al_2O_3-SiO_2 System
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Incorporation of Chlorine in a Secondary Steelmaking Slag Based on the CaO-Al_2O_3-SiO_2 System

机译：CaO-Al_2O_3-SiO_2体系的二次炼钢渣中氯的掺入

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CaO-Al_2O_3-SiO_2 = 50-42-8% by weight (wt%) eutectic slags, similar in composition to a secondary steelmaking slag, containing 1-15 wt% CaCl_2 were heated to 1 798 K. DTA was performed and the system was cooled. Samples were characterized by electron microprobe and X-ray powder diffraction. Four main crystalline phases were present, CaO·Al_2O_3, 2CaO·Al_2O_3·SiO_2, β-2CaO·SiO_2 and 11 CaO·7Al_2O_3·CaCl_2. The chlorine phase was very similar to the mayenite phase (12CaO·7Al_2O_3). It formed first at 1 321 (± 27) K and remained solid as a separate phase because of its high melting point. The rest of the system, upon cooling, crystallized according to the well-known CaO-Al_2O_3-SiO_2 phase diagram. It was seen that if chlorine is present in sufficient amounts (greater than 4.9 wt%), the chlorine phase constitutes 92 Wt% of the final slag. Also when the chlorine phase was less than 92 wt% in the final slag, the recovery of chlorine exceeded 90%. For comparison, CaO-Al_2O_3-SiO_2 = 48-12-40 wt% representing an ironmaking slag, was mixed with 10.0 wt% CaCl_2 and also similarly heated and characterized after cooling. The phases observed were 2CaO·Al_2O_3·SiO_2 and two new chlorine phases, all of which were glassy.
机译：CaO-Al_2O_3-SiO_2 = 50-42-8％重量（wt％）的低共熔渣，其成分与二次炼钢渣相似，包含1-15 wt％的CaCl_2，被加热到1798K。执行DTA，系统冷却了。通过电子探针和X射线粉末衍射对样品进行表征。存在四个主要的结晶相CaO·Al_2O_3、2CaO·Al_2O_3·SiO_2，β-2CaO·SiO_2和11个CaO·7Al_2O_3·CaCl_2。氯相与钙铝石相非常相似（12CaO·7Al_2O_3）。它首先在1 321（±27）K处形成，并由于其高熔点而保持固态作为单独的相。冷却后，系统的其余部分根据众所周知的CaO-Al_2O_3-SiO_2相图进行结晶。可以看出，如果存在的氯量足够（大于4.9 wt％），则氯相占最终炉渣的92 Wt％。另外，当最终炉渣中的氯相小于92wt％时，氯的回收率超过90％。为了比较，将代表炼铁炉渣的CaO-Al_2O_3-SiO_2 = 48-12-40 wt％与10.0 wt％CaCl_2混合，并在冷却后进行类似的加热和表征。观察到的相为2CaO·Al_2O_3·SiO_2和两个新的氯相，它们均为玻璃态。

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