...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Fluoride Speciation in Stainless Steel Pickling Liquor
【24h】

Fluoride Speciation in Stainless Steel Pickling Liquor

机译：不锈钢酸洗液中的氟化物形态

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Mixtures of hydrofluoric and nitric acids are used in the pickling of stainless steels, in order to remove oxide scale, generating pickling waste liquors with high HF concentration. Species appearing in this mixed acid solution are fluoride-metal complexes with high stabilization constants. This work discusses about the modelling of equilibrium reactions that could take place, like complexation of iron and chromium. As observed in the literature, 31 species could be present in pickling liquor with 25 equilibrium reactions. Activity coefficients are calculated using Bromley's methodology that depends on cation-anion interaction parameter B. New parameters at 25℃ have been calculated, using Nelder and Mead Simplex Algorithm. The new model shows that FeF_3, CrF~(2+) and Ni~(2+) are the main metallic forms in the solution and undissociated hydrofluoric acid has a high relative concentration, while free fluoride practically does not exist in solution. In neutralization processes, free fluoride is released from undisocciated hydrofluoric acid. Therefore, high fluoride complexes are formed, which could precipitate instead of metal hydroxides.
机译：在不锈钢酸洗中使用氢氟酸和硝酸的混合物，以去除氧化皮，产生高HF浓度的酸洗废液。在这种混合酸溶液中出现的物种是具有高稳定常数的氟化物-金属配合物。这项工作讨论了可能发生的平衡反应的建模，例如铁和铬的络合。正如文献中观察到的那样，酸洗液中可能存在31种物质，发生25次平衡反应。使用布罗姆利的方法计算活度系数，该方法取决于阳离子-阴离子相互作用参数B。使用Nelder和Mead Simplex算法计算了25℃下的新参数。新模型表明，FeF_3，CrF〜（2+）和Ni〜（2+）是溶液中的主要金属形式，未离解的氢氟酸具有较高的相对浓度，而溶液中实际上不存在游离氟化物。在中和过程中，游离的氟化物会从未解离的氢氟酸中释放出来。因此，形成了高氟化物络合物，它可以代替金属氢氧化物沉淀出来。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号