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The oxidation of synthetic Zn 1− xFe xS is easier than marmatite in air. Hydroxyl easily absorbs on the surface of iron-bearing zinc sulfide (Zn 1− xFe xS). The surfaces of marmatite and synthetic zinc sulfides contain high oxygen due to oxidation and oxygen adsorption. The addition of carbon can not only enhance the sulfidation but increase sulfur utilization rate and eliminate the generation of SO 2. Fe 2O 3 captured the sulfur in the initial sulfidation process as iron sulfides, which then acted as the sulfurizing agent in the late period, thus reducing sulfur escape at high temperatures. The results indicate that increasing temperature and adding iron oxide can not only improve the sulfidation of ZnO but also promote the formation and growth of ZnS crystals. The thermodynamic analysis, sulfidation behavior of zinc, phase transformations, morphology changes, and surface properties were investigated by HSC 5.0 combined with FactSage 7.0, ICP, XRD, optical microscopy coupled with SEM-EDS, and XPS. All rights reserved.The mechanism of ZnO sulfidation with sulfur and iron oxide at high temperatures was studied. © 1999 Division of Chemical Education, Inc.,American Chemical Society. | Chemistry Comes Alive! (entry page) | Table of Contents | Matrix of Chapters and Topics | Index| Alphabetical List of Topics | Chemistry Textbooks | How could you demonstrate that the iron and sulfur before reaction constituted a mixture, but after the reaction a compound had been made? What kinds of experimental work would you need to do to determine that the empirical formula for the product of the reaction of iron (zinc) with sulfur is FeS (ZnS)?Ĥ. Are the reactions shown exothermic or endothermic? Cite observations that justify your choice.ģ. What observable evidence indicates that a chemical reaction is taking place?Ģ. In addition to ZnS( s ) some ZnO( s ) and some SO 2( g ) are produced by the high temperature of the second reaction.ĭemonstration Notes, Warnings, Safety Information, etc.ġ. Only when heated to the temperature of a red-hot metal rod do they react rapidly-in the case of zinc, almost explosively.Įquations for the principal reaction in each case are However, iron and sulfur and zinc and sulfur can be mixed at room temperature and no reaction takes place. Iron(II) sulfide and zinc sulfide are quite stable compounds and their formation from the metal and sulfur is highly exothermic. A heated metal rod causes the mixture to react vigorously. Zinc Play movie(QuickTime 3.0 Sorenson, duration 19 seconds, size 1.3 MB)
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The heat initiates an exothermic reaction. The reaction product, iron sulfide, is fused to the rod. A heated metal rod initiates an exothermic reaction. Iron Play movie(QuickTime 3.0 Sorenson, duration 32 seconds, size 2.2 MB) The reaction with zinc produces flame and a near explosion.Ĭombination reaction, descriptive chemistry, enthalpy/heat, evidence of chemical reaction, exothermic process, iron, metals, reactivity - kinetic/thermodynamic stability, redox reaction, sulfur/sulfur oxides/sulfuric acid When heated with a red-hot metal rod, mixtures of iron and sulfur and of zinc and sulfur react vigorously. Reactions of Iron with Sulfur, Zinc with Sulfur Reactions of Iron with Sulfur, Zinc with Sulfur