Removal rules of potassium,sodium and zinc from sinterstrand head ash under carbon thermal reduction
Fe and K in sinterstrand head ash have high recovery value,and the recovery of these two metals is the main goal of head ash resource utilization.Chemical analysis,X-ray diffraction and scanning electron microscopy are used to study the physical and chemical properties of sinterstrand head ash,such as chemical composition,phase composition and microstructure.Roasting experiments are conducted to explore the influence of roasting temperature,roasting time and n(C)/n(O)(ratio of amount of substance)on the metallization rate and K,Na and Zn removal rate of sinterstrand head ash.The results show that the main components of Fe,K and Cl in the sinterstrand head ash account for 55.72％of the total mass,and K,Na and Zn in the ash exist in the form of KCl,NaCl and ZnFe2O4,respectively.The metallization rate and K,Na and Zn removal rates of carbon-containing agglomerates increase with the increase of roasting temperature,roasting time and n(C)/n(O).The removal of Zn in the agglomerates is relatively easy,while the removal of K and Na is relatively difficult.When the roasting temperature is 1 150 ℃,the roasting time is 10 min and the n(C)/n(O)is0.9,the metallization rate and Zn removal rate of the carbon-containing agglomerates are 93.97％and 98.53％,respectively.When the roasting temperature is 1 150 ℃,the roasting time is 60 min and the n(C)/n(O)is 1.2,the removal rates of K and Na in the agglomerates are 90.14％and 81.37％,respectively.
万方数据
维普
