The Research Of Strong Magnetic(Flocculation)-reverse Foltation Technology And Floccculation Properties Of Oolitic Hematite

Oolitic hematite of "Ningxiang type" is the typical representative of hematite in our country, with a number of reserves in the area of southern part of China and southern Gansu province, and has an utmost importance in red mineral resources in China. Because of oolitic hematite’s complex metallogenic conditions, very fine disseminated grain size, in concentric circles embedded with the gangue, and high phosphorus content, its still cannot be used effectively. Under the conditions of China’s current economic rapid development, a lot of steel needed for support but the domestic ore supply has shortage, studying the new technology and new equipment in order to exploit and utilize the oolitic hematite to alleviate the domestic iron ore supply pressure and promote economic development, has the significant practical significance.The high phosphorus oolitic hematite in western Hubei province is the research object in this article, this sample’s full iron(TFe)content is49.02%, the hematite Fe2O3content is64.34%, and the gangue minerals are mainly fades chlorite, iron dolomite, glue phosphate rock and a few quartz, with the oolitic size is commonly-0.380mm, and phosphorus content is1.18%. The principle flow of strong magnetic separation-selective flocculation-reverse flotation is studied in this subject, and the selectivity flocculation mechanism of hematite is discussed. Factors, such as magnetic field intensity, particle size and flow path, are studied in strong magnetic separation process. Under the conditions of grain size of-0.045mm grain of class content of about90%, magnetic field intensity to be477.5kA/m, the sample’s iron grade is enhanced to51.18%, with a recovery rate of72.84%, after one time of roughing and one time of concentrate. The sample’s direct contrast flocculation-reverse flotation, strong magnetic separation-direct reverse flotation and strong magnetic separation-flocculation-reverse flotation flow path are contrasted in this subject, of which strong magnetic separation-direct reverse flotation process’ results are better. When inhibitors dosage is800g/t, and the dosage in roughing and concentrate of collector respectively is300g/t and150g/t, the iron grade of flotation concentrate is55.42%, with the homework iron recovery of74.35%. The direct flocculation-reverse flotation process and strong magnetic separation-selective flocculation-reverse flotation process have a worse result, and the effect of selectivity flocculation of hematite is not obvious. The strong magnetic separation-direct reverse flotation flow path is chosen to do the open and closed circuit test, showing that, strong magnetic separation-direct reverse flotation process flow has good stability in separation of the oolitic hematite, and also has better selection Index, it has certain directive significance for the sue of oolitic hematite.The research of flocculation mechanism shows that, Na2SiO3can significantly change the ζ potential of quartz and hematite, which making the ζ potential more negative, thereby enhancing the role of particles electrostatic rejection, eventually led to the good scattered of particles; Polymer flocculating agents of starch modified by NaOH has good selectivity flocculation properties on quartz-the hematite system, this starch can significantly change the ζ potential of hematite than quartz, IR spectrum shows the adsorption of starch on the surface of hematite relies on hydrogen bonding force.