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首页> 外文期刊>ISIJ international >Influence of Gypsum Addition and Hydrothermal Treatment on Dissolution Behavior of Fluorine in Hot Metal Pretreatment Slags
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Influence of Gypsum Addition and Hydrothermal Treatment on Dissolution Behavior of Fluorine in Hot Metal Pretreatment Slags

机译：石膏加水热处理对氟在铁水预处理渣中溶解行为的影响

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摘要

Immobilization of fluorine by using calcium aluminate, calcium silicate, calcium aluminum silicate and secondary refining slag as a stabilizing agent has been studied by focusing on the effect of gypsum addition on fluorine dissolution from hot metal pretreatment slags in shaking test. When gypsum is added to aqueous solution in which calcium aluminate or secondary refining slag with low contents of both SiO_2 and total Fe are present, fluorine immobilization does not occur due to the formation of ettringite and monosulfate on particle surface of added stabilizing agent. In the case of the mixture of calcium silicate and gypsum, calcium aluminum silicate or secondary refining slag with high SiO_2 and low total Fe contents, fluorine ion in solution can be immobilized through the formation of C-S-H-F-SO_4 gel, Ca_(10)(SiO_4)_3(SO_4)_3(OH, F)_2 and Ca_5[(Si, S)O_4]_3(OH, F). It was found that fluorine is immobilized by hydrothermally treating the mixture of hot metal pretreatment slag, secondary refining slag with high SiO_2 and low total Fe contents and gypsum at 80℃ for 3 h.
机译：以铝酸钙，硅酸钙，硅酸铝钙和二次精炼炉渣为稳定剂，通过在振动试验中重点研究了石膏添加对铁水预处理炉渣中氟溶解的影响，研究了氟的固定化方法。当将石膏添加到存在铝酸钙或SiO_2和总Fe含量均较低的二次精炼炉渣的水溶液中时，由于在添加的稳定剂的颗粒表面形成钙矾石和单硫酸盐而不会发生氟的固定化。在硅酸钙和石膏，硅酸钙铝或具有高SiO_2和低总Fe含量的二次精炼渣的混合物的情况下，可以通过形成CSHF-SO_4凝胶，Ca_（10）（SiO_4）来固定溶液中的氟离子。 ）_3（SO_4）_3（OH，F）_2和Ca_5 [（Si，S）O_4] _3（OH，F）。结果表明，在80℃下，对铁水预处理渣，SiO_2含量高，总铁含量低的二次精炼渣和石膏的混合物进行水热处理3 h​​，可以固定氟。

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