关键词: 钾长石;磷矿;助熔剂;熔融还原

Abstract: The process and kinetics of K-feldspar on the smelting reduction of phosphate rock were investigated.The effect of reaction temperature, reaction time, acidity value and carbon excess coefficient on the phosphorus reduction ratio were studied.The results showed the phosphorus reduction ratio with the increase of reaction temperature, reaction time, acidity value and carbon excess coefficient.The reduction ratio reached to 99.61％ under the optimal conditions: reaction temperature 1300 ℃, reaction time 40 min, coke excess coefficient of 1.05 and 0.85 acidity value.The date fit was made on changing curves of the reduction rate with time at different temperatures to calculate its reaction rate.The drawing was plotted with logarithms of the reaction rate and concentration to obtain the reaction order.The results showed that the reaction order of the smelting reduction of the phosphate rock was not a constant and changes with the reaction temperature.The activation energy Ea was 100.71 kJ/mol calculated by Arrhenius formula.

Key words: K-feldspar;phosphate ore;fluxing;smelting reduction