Study On A New Technology Of Selective Dispersion And Flocculation Of Hematite

In recent years the import of ironstone is increasing dramatically, the quantity of ironstone imported accounts for 50% of the total amount using for smelting. After exploring for more than 50 years, the resource of ironstone is in great shortage and the store is insufficient as well. By contrast, the domestic reserve of hematite is relatively more, but hematite is more difficult to separate. Recently, the shortage of ironstone has become serious, and the exploitation of Tongdao iron ameliorated the shortage of ironstone for the company.Tongdao ore belongs to sediment metamorphose hematite ore. Mineral component is simpleness comparatively, hematite ore consists mainly of iron ore, the main parts of matrix are quartz and sericite, next about chlorite, calcspar, and so on. The particles of useful minerals and non-useful minerals are thinner generally, and difficult to process. So it is of certain representative to develope and utilize. Dispersing agent system has been developmented by means of summarization of cross-correlation technique at home and abroad. In this article, the adsorption behavior of polyvinylpyrrolidone (PVP) on pure quartz and pure iron oxide have been studied. Many factors which include the different molecular weight of PVP, pH, the solution temperature and the fineness of quartz were explored on the properties of adsorption. Further more, the underlying adsorption mechanism are discussed. The amount of PVP adsorbed onto quartz is significantly higher as compared to iron oxide. The adsorption capacity for PVP increased with increasing molecular mass and temperature but is independent of pH.Compared with other dispersing agents, the dispersing agent system was applied in the selective desliming stage. Important factors which include the pH, the stirring rate, the stirring time and pulp density are explored to the dispering system. Finally, the optimal dispersing technology is determined which include the pulp concentration of 17%, pH = 9.5, stirring rate for 1200 r/min, stirring for 10 minutes. In selective flocculation stage, it is found that the PVP selective flocculation effect is better than modified corn starch, and the water quality is little impact the flocculation-selective breaking the traditional polymer flocculant sensitive to the water quality.Through a series of conditions processes, which include dry strong-magnetic, wet strong-magnetic , centrifugal mineral processing, selective dispersion and flocculation process and contra-flotation stage process, the optimal conditions is selected, and four different joint processes is proposed. Ultimately, the joint process of "stage of grinding -dry strong-magnetic-wet strong-magnetic-selective desliming- contra-flotation" is adopted. This process can get TFe of the extract above 62%, ferrous metals recovery rate of nearly 70%. So show how to explore and use the mineral in Tongdao.