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Thermodynamics of molten calcium aluminate slag

熔融铝酸钙渣的热力学

基本信息

批准号：
62470053
负责人：
BAN-YA Shiro
金额：
$ 3.9万
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 (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

Various kinds of fluxes for dephosphorization and desulphurization of hot metal and steel have been developed at past decade to producehigh purity steel and to reduce the slag amount formed during refining. Practically used fluxes in hot metal treatment And secondary refining processes are Na_2CO_3 based and CaO-calcium halides-Fe_xO_y fluxes, but the following problems are realized in these fluxes. a)Huge evolution of fume and stinking gas. b) High cost of Na_2CO_3, CaF_2 c)Corrosion of refractories. d)Disposal of the formed slag, and so on. In the present work, dephosphorization and desulphurization of hot metal and steel with CaO-Al_2O_3-Fe_xO_y flux was studied to seek a solution of above-mentioed problems. The reason why Al_2O_3 is used as the flux are as follows: a) The degree of melting point depression of CaO in CaO-Al_2O_3 system is similar to those in CaO-CaF_2 and CaO-Fe_tO systems. b) There is a large amount of natural resources such as bauxite and diaspore as the source of Al_2O_3. c)aL_2O_3 has no so bad effect on the dephosphorization with CaO in comparison with SiO_2. d)There is no trouble in disposal of the formed slag, and it might be useful for land improvement.In view of the above-mentioned, hot metal and steel were treated by the use of CaO-Al_2O_3-Fe_xO_y flux. As the results, it was confirmed that dephosphorization power of CaO-Al_2O_3-Fe_xO_y flux was similar to the practically used fluxes in hot metal treatment and secondary refining processes. But this flux was not so effective for desulphurization of hot metal and steel.

为了生产高纯钢和减少炼钢过程中形成的渣量，近十年来开发了各种用于铁水和钢的脱磷脱硫的助熔剂。在铁水处理和二次精炼工艺中实际使用的助熔剂有Na_2CO_3基助熔剂和cao -钙-卤化物- fe_xo_y助熔剂，但这些助熔剂存在以下问题：a)烟雾和恶臭气体的巨大演变。b) Na_2CO_3， CaF_2成本高c)耐火材料腐蚀。d)形成渣的处理等。本文对CaO-Al_2O_3-Fe_xO_y助熔剂对铁水和钢铁的脱磷脱硫进行了研究，以寻求解决上述问题的方法。选用Al_2O_3作助熔剂的原因如下：a) CaO-Al_2O_3体系中CaO的熔点下降程度与CaO- caf_2和CaO- fe_to体系相似。b)铝土矿、一水硬石等自然资源是Al_2O_3的主要来源。c)与SiO_2相比，aL_2O_3对CaO脱磷的影响较小。d)形成的矿渣处理无麻烦，可用于土地改良。鉴于此，采用CaO-Al_2O_3-Fe_xO_y助熔剂处理铁水和钢。结果表明，CaO-Al_2O_3-Fe_xO_y助熔剂的脱磷能力与铁水处理和二次精炼过程中实际使用的助熔剂相当。但该助熔剂对铁水和钢铁的脱硫效果不佳。