氧化镍和硫化铜矿联合熔炼炉渣的黏度

Viscosity of slags from joint smelting of oxidized nickel and sulfide copper ores

测定氧化镍和硫化铜矿联合冶炼熔渣的黏度。制备的模拟熔渣与实际熔渣的成分和结构相似,并限制研究的熔渣的成分范围,含铁熔渣的成分(质量分数)为:8.9%CaO、11.8%MgO、12.5%Al_(2)O_(3)、47.4%SiO_(2)、13.3%FeO和5.0%Fe_(2)O_(3);无铁熔渣是将含铁熔渣中的氧化铁去除得到,其成分(质量分数)为:12.5%CaO、16.0%MgO、9.4%Al_(2)O_(3)和58.3%SiO_(2)。由振动法测试的含铁熔渣(1550~1300℃)和无铁熔渣(1550~1400℃)的黏度实验值分别为0.31~2.33 Pa·s和1.28~4.55 Pa·s。由Kalmanovitch-Frank模型预测的含铁熔渣的黏度值与实验值存在偏差。通过Weimann-Frenkel-Urbain方程对实验数据进行回归分析,提出可预测所考虑温度范围内的初级熔渣黏度的原始经验模型。当碱度从0.7(含铁熔渣)降低到0.6(无铁熔渣),黏性流动活化能从204 kJ/mol增加到236kJ/mol。为了保持最佳熔渣黏度,氧化镍和硫化铜矿联合冶炼的温度应不低于1400℃。

The work is devoted to the viscosity determination of molten slags from the joint smelting of oxidized nickel and sulfide copper ores.The model slags were synthesized close in composition and structure to real samples,and limiting the investigated composition range(wt.%):iron-containing slag(8.9 CaO,11.8 MgO,12.5 Al_(2)O_(3),47.4 SiO_(2),13.3 FeO,and 5.0 Fe_(2)O_(3))and iron-free slag formed by removing iron oxides from the iron-containing slag(12.5 CaO,16.0 MgO,9.4 Al_(2)O_(3),and 58.3 SiO_(2)).The experimental(vibrational method)viscosity values for iron-containing(1550−1300℃)and iron-free(1550−1400℃)model slags are 0.31−2.33 and 1.28−4.55 Pa·s,respectively.Viscosity estimation by the Kalmanovitch–Frank model shows a discrepancy with the experimental data for iron-containing slag.Regression analysis(by Weimann–Frenkel–Urbain formalism)of the experimental data was carried out,and original empirical models were proposed to predict the primary model slags viscosity in the considered temperature range.Reducing the basicity from 0.7(iron-containing slag)to 0.6(iron-free slag)increases viscous flow activation energy from 204 to 236 kJ/mol.To maintain optimal slag viscosity,joint smelting of oxidized nickel and sulfide copper ores should be carried out at a temperature not lower than 1400℃.