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Dissolution of alumina, copper oxide and nitrogen in molten slags: Thermodynamics and kinetics.

机译：氧化铝，氧化铜和氮在熔渣中的溶解：热力学和动力学。

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摘要

Three studies have been conducted concerning thermodynamics and kinetics of dissolution of alumina, copper oxides and nitrogen in various molten slags.; In the first study, the dissolution rate of alumina particles in molten CaO-Al2O3-SiO2 slag was measured at 1500--1550°C by direct sampling method for the purpose of understanding the dissolution behavior of alumina inclusion in molten slags. It was found that the dissolution rate decreased with increasing SiO2 and Al2O3 contents in slag, but increased with increasing temperature. In the ladle type slags, alumina particles dissolved much faster than in the tundish type slags.; In the second study, solubility of solid CuO in molten Na2O-B 2O3 slag and liquid Cu2O in molten CaO-B 2O3-SiO2 slag was measured at 1000°C and 1250°C, with attempts to find suitable slags for the fluxing stage of the proposed oxidizing-fluxing process to remove copper from steel scrap. Experimental results showed that the minimum solubility occurred at neutral slag compositions, demonstrating amphoteric nature of CuO and Cu2O A regular solution model was employed to interpret the solubility data of CuO in Na2O-B 2O3 slag to obtain the interaction energies of CuO-NaO 0.5 and CuO-BO1.5, and then solubility curve, iso-activity curves and isothermal section of phase diagram of CuO-Na2O-B 2O3 system at 1000°C were drawn from the model calculation. Basic Na2O-B2O3 slag is expected to be a suitable slag for the fluxing process. The objective of the third study is to investigate the feasibility of removing nitrogen from molten steel by two newly proposed slag systems, TiO slag and Ti2O3 slag. Nitrogen distribution ratios between slag and steel were measured at 1600°C, for CaO-Al2O3-TiO, CaO-Al2O3-Ti 2O, CaO-Al2O3-TiO2 and CaO-Al 2O3 by two new slag-metal equilibration techniques, i.e., liquid sealing method and static atmosphere method. Activity coefficients of AIN and TiN, as useful indexes of measuring ability of slag to remove nitrogen, were evaluated from measured nitrogen distribution ratios. The order of slag's ability to remove nitrogen was found as TiO slag Ti2O3 slag > TiO2 slag > CaO-Al2O3 slag. TiO slag was found to be much more effective for removing nitrogen from steel than other slags including all slags investigated.
机译：关于氧化铝，氧化铜和氮在各种熔渣中溶解的热力学和动力学进行了三项研究。在第一项研究中，通过直接采样法在1500--1550°C下测量了氧化铝颗粒在CaO-Al2O3-SiO2熔渣中的溶解速率，目的是了解氧化铝在熔渣中的溶解行为。发现熔渣溶解速率随炉渣中SiO2和Al2O3含量的增加而降低，但随温度的升高而增加。在钢包型炉渣中，氧化铝颗粒的溶解速度比中间包型炉渣快得多。在第二项研究中，在1000°C和1250°C下测量了固态CuO在熔融的Na2O-B 2O3炉渣中的溶解度和液态Cu2O在熔融的CaO-B 2O3-SiO2炉渣中的溶解度，并试图找到合适的炉渣熔渣阶段。建议的氧化-熔炼工艺从废钢中去除铜。实验结果表明，在中性炉渣成分中存在最小溶解度，表明了CuO和Cu2O的两性性质。采用常规溶液模型解释了CuO在Na2O-B 2O3炉渣中的溶解度数据，获得了CuO-NaO 0.5的相互作用能和根据模型计算，绘制了CuO-BO1.5，然后绘制了CuO-Na2O-B 2O3体系在1000°C下的溶解度曲线，等活度曲线和相图的等温截面。预计碱式Na2O-B2O3炉渣是适合于助熔剂工艺的炉渣。第三项研究的目的是研究通过两种新提议的TiO渣和Ti2O3渣体系从钢水中脱氮的可行性。通过两种新的炉渣-金属平衡技术，即液态法，在1600°C下测量了CaO-Al2O3-TiO，CaO-Al2O3-Ti 2O，CaO-Al2O3-TiO2和CaO-Al 2O3在炉渣和钢之间的氮分布比。密封法和静态气氛法。从测得的氮分布比中评估了AIN和TiN的活度系数，作为衡量炉渣脱氮能力的有用指标。渣的脱氮能力顺序为：TiO渣 Ti2O3渣> TiO2渣> CaO-Al2O3渣。发现TiO炉渣比其他炉渣（包括所有研究的炉渣）从钢中去除氮的效率要高得多。

著录项

  • 作者

    Fan, Peng.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Engineering Metallurgy.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 109 p.
  • 总页数 109
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;工程材料学;
  • 关键词

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