Effect of Fe/SiO2 and CaO/SiO2 mass ratios on metal recovery rate and metal content in slag in oxygen-enriched direct smelting of jamesonite concentrate

The oxygen-enriched direct smelting of jamesonite concentrate was carried out at 1250℃by changing the slag composition.The effects of Fe/SiO2 and Ca O/SiO2 mass ratios on the metal recovery rate as well as metal content in slag were investigated.Experimental results indicated that the metal(Pb+Sb)recovery rate was up to 88.30%,and metal(Pb+Sb)content in slag was below 1 wt.%under the condition of slag composition of 21-22 wt.%Fe,19-20 wt.%SiO2 and 17-18 wt.%Ca O with Fe/SiO2 mass ratio of 1.1:1 and Ca O/SiO2 mass ratio of 0.9:1.The microanalysis of the alloy and slag demonstrated that the main phases in the alloy contained metallic Pb,metallic Sb and a small amount of Cu2 Sb and Fe Sb2 intermetallic compounds.The slag was mainly composed of kirschsteinite and fayalite.Zinc in the raw material was mainly oxidized into the slag phase in the form of zinc oxide.

烟气循环流化床同时脱硫脱硝试验及机理研究

实验制备了以粉煤灰、石灰为原料的高活性吸收剂,并在其中加入氧化性M添加剂使之成为具有氧化能力的高活性吸收剂.在烟气循环流化床上进行了同时脱硫脱硝试验,研究了影响同时脱硫脱硝效率及钙利用率等的若干因素.在最佳试验条件下,脱硫效率和脱硝效率分别达到了95.5%和64.8%.实验对反应后吸收剂中SO2和NO的脱除产物进行了成分分析,结果表明,在脱除产物中除了有硫物种外还有大量氮物种,利用扫描电子显微镜和X射线能谱仪对高活性吸收剂基本材料如粉煤灰、“富氧型”高活性吸收剂和反应后的“富氧型”高活性吸收剂进行了表面微区分析,根据试验结果提出了“富氧型”高活性吸收剂的脱硫脱硝机理.