Thermodynamic Stuby on the Removal of Copper in Steel Scrap by Sulfide Fluxes

硫化物熔剂脱废钢中铜的热力学研究

• 批准号: 01550515
• 负责人: NAGASAKA Tetsuya
• 金额: $ 1.02万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550515/
• 关键词: Tramp Element; Steel Scrap; Recycling; Steelmaking; Sulfide; Flux; Distribution; Thermodynamics; 鉄リサイクリング; 脱銅; 分配平衡; 溶液モデル

The tramp elements such as Cu, Sn, Sb etc. in steel scrap can not be removed by the traditional steelmaking process. Therefore, economical prcesses to remove these impurities have to be developed for the recycling of steel scrap. Present work dealt with the thermodmynamics on the removal of tramp elements, mainly Cu, in liquid iron by using sulfide flux. The present investigation consisted of following four parts.1) Phase equilibria in the basic system of Fe-S-C ternary melt were measured and thermodynamic properties of this system were evaluated by applying interstitial solution model.2) The activities of Cu, Sn, Sb in Fe-S-C_<sat>. Melts were experimentally determined.3) The distribution ratio of Cu, Sn, Sb Ni, Cr, Mn or Mo between FeS-Na_2S flux and Fe-C_<sat>. melt was measured at 1673K. The addition of Na_2S to FeS increased the distribution ratio of Cu, L_<Cu>=(mass%Cu)_<flux>/[mass%Cu]_<iron>, from 9 at X_<NaS_<0.5>>=0 to the maximum of L_<Cu>=24 at X_<Nas_<0.5>>=0.4. Na_2S also … More considerably lowered sulfur content in liquid iron. The activity coefficient of CuS_<0.5> in flux was evaluated to discuss the effect of Na_2S on L_<Cu>. It was founs that Na_2S decreased gamma CuS_<0.5>, so that L_<Cu> increased in spite of the significant decrease of sulfur potential. The distribution ratios of Sn, Sb, Ni, Cr and Mo were very low, while L_<Mn> was very high.4) Effect of alkaline or alkaline earth metal sulfides on L_<Cu> was studied. Similar to the effect of Na_2S, Li_2S, K_2S, SrS or BaS increased L_<Cu> and lowered sulfur content in liquid iron. The maximum of L_<Cu> in each flux were about 20 to 30. Thermodynamic consideration was made to discuss the removal limit of Cu from liquid iron by sulfide fluxes.It was concluded from the present work that Cu can be removed from liquid iron by sulfide flux. However, L_<Cu> was not high enough for the practical application. Therefore, we need more effort to develop the effective Cu removal process from remelted steel scrap. Less

废钢中的Cu、Sn、Sb等杂质元素无法通过传统的炼钢工艺去除，因此，目前的废钢回收工作需要开发经济的工艺来去除这些杂质。利用硫化物熔剂去除铁液中的杂质元素（主要是Cu）的研究主要包括以下四个部分：1）测量了Fe-S-C三元熔体基本体系的相平衡。应用间隙溶液模型评价了该体系的热力学性质。2)实验测定了Fe-S-C_<sat>熔体中Cu、Sn、Sb的活度。3)Cu、Sn、Sb的分配比。在1673K下测量FeS-Na_2S熔剂和Fe-C_熔体之间的Ni、Cr、Mn或Mo。Na_2S添加到FeS中增加了Cu的分配比。 L_<Cu>=(质量%Cu)_<通量>/[质量%Cu]_<铁>，从 X_<NaS_<0.5>>=0 处的 9 到 X_< 处 L_<Cu>=24 的最大值Nas_<0.5>>=0.4。Na_2S也显着降低了铁液中的硫含量。评估了熔剂中CuS_<0.5>的活性系数，以讨论Na_2S的影响。 Na_2S对L_<Cu>的影响发现，Na_2S降低了γCuS_<0.5>，使得Sn、Sb、Ni、Cr和Mo的分配比显着降低，但L_<Cu>增加。非常低，而L_<Mn>非常高。4)研究了碱金属或碱土金属硫化物对L_<Cu>的影响。 Na_2S、Li_2S、K_2S、SrS或BaS增加了铁液中的L_<Cu>，降低了铁液中的硫含量。各熔剂中L_<Cu>的最大值约为20～30。从热力学角度考虑了Cu的去除极限。从目前的工作得出结论，硫化物助熔剂可以从铁水中去除铜，但是，L_<Cu> 还不够高。因此，我们需要加大力度开发有效的重熔废钢脱铜工艺。

项目成果

王 潮: "FeSーNa_2系フラックスと炭素飽和溶鉄間の銅の分配平衡" 鉄と鋼. 77. 504-511 (1991)

王超：“FeS-Na_2 体系熔剂与碳饱和铁水之间的铜分布平衡”Tetsu to Hagane 77. 504-511 (1991)。

王潮: "Fe-S-C三元系融体の相平衡" 材料とプロセス. 2. 1239 (1989)

王超：“Fe-S​​-C三元熔体的相平衡”材料与工艺2. 1239 (1989)。

王 潮: "FeSフラックスと炭素飽和溶鉄間の銅分配に及ぼすアルカリ及びアルカリ土類金属硫化物添加の影響" 鉄と鋼. 77. (1991)

Chao Wang：“添加碱金属和碱土金属硫化物对 FeS 熔剂和碳饱和铁水之间的铜分配的影响”Tetsu to Hagane 77。（1991）

王潮: "溶融FeS-炭素飽和溶鉄間の銅分配に及ぼすアルカリ、またはアルカリ土類金属硫化物添加の影響" 材料とプロセス. 2. 1241 (1989)

王超：“添加碱金属或碱土金属硫化物对熔融 FeS 和碳饱和熔融铁之间的铜分布的影响”材料和工艺。 2. 1241 (1989)。

王潮: "FeーSーC3元系融体の相平衡" 鉄と鋼 ((社)日本鉄鋼協会会誌). 77. 353-360 (1991)

王超：“Fe-S​​-C三元熔体的相平衡”Tetsu to Hagane（日本钢铁研究所学报）77. 353-360（1991）。