| Jidong is a major production areas of powdered iron in China. Sulfur in iron ore concentrate in Jidong is mainly in the form of pyrrhotite. To improve the deposit part overall economic value and make full use of this resource, we must take appropriate technical measures to reduce sulfur in iron concentrate.Due to its physical and chemical properties of pyrrhotite, it is difficult to separate the pyrrhotite and magnetite by conventional separation methods.Effective separation method between the pyrrhotite and magnetite has become one of the main problems in the field of mineral processing in China and abroad. It is the preferred process to deal with removing the pyrrhotite in iron concentrrate by utilization of sulfur flotation drop. In this paper, it will carry on a thorough and painstaking discussion on floatation collecting and activation mechanism of pyrrhotite in sulfur-bearing iron concentrate in Jidong area, and also provide a theoretical foundation and technical support for the desulfurization process.It will mainly carry on the research of ore element analysis, the graded distribution,undressed ore grinding fineness and multi-element determination, iron phase test and spectrum test, pure minerals flotation behavior for the physical and chemical properties of iron ore concentrate. On the basis of research, it will carry on experimental study on flotation of pyrite concentrate containing, by research on reagent type and dosage to determine the acid and alkali environment, activator, collector, and by study on rough selection optimization for the process to ensure the accuracy and rationality of test results and determine reasonable flotation technology. A rough fine desulfurization experiment and A more precise desulfurization experiment are carried out through the flotation desulfurization method to finalize total dosage of follows under the condition of a rough four fine flotation parameters, such as sulfuric acid 560g/t, copper sulfate 150g/t, butyl xanthate: ammonium dibutyl dithiophosphate(1:1)700gft and 2# oil 150g/t, TFe 60.60% and sulffur ore 4.04%, by adopting desulftirizing flotation process,it can be gained good index of iron ore concentrate TFe 62.31%, SO 64%, TFe recovery rate 79.27%, which provides practical guiding significance for the field production.Through the research on mechanism of pyrrhotite internal and surface characteristics, it can be known pyrrhotite's minimum surface energy and higher stability in (1, 1,0) surface. By molecular dynamics calculation results, it can be known that the interaction energy of oxygen and pyrrhotite is -42.91KJ/mol, bigger than that of the water molecules, which explains it is more advantageous for the oxidation of pyrrhotite in aerobic flotation process. By study on the surface Zeta potential, it can be known that the surface Zeta potential of pyrrhotite has a tendency to drift to the left after adding butyl xanthate and amyl xanthate, which explains the adsorption of collector and pyrrhotite. Through the infrared spectrum analysis after agentia and mineral surface reaction, it can be known that C-O-C stretching vibration absorption peak value increases to 1202.52cm-1 and C=S stretching vibration absorption peak value decreases to 1022.98cm-1, which states that mineral surface can produce chemical adsorption and double yellow medicine is generated.Through the research on flotation technology, mechanism of pyrrhotite internal and surface characteristics, it explains the characteristics of pyrrhotite surface adsorption, the stability of the agentia and mechanism of increasing the natural flotability. Based on it, we can find a suitable agentia for high sulphur pyrrhotite,which offers a new way for the development and application of sulphur iron ore concentrate in Jidong area, China. |
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