High Phosphorus Hematite In Western Hubei Extraction Iron And Remove Phosphorusproucess Performance Study

This research take the hematite with high phosphorus in Western Hubei as research subject. The composition of this oolitic hematite mineral is very complex, embedded cloth very fine, impurities content such as phosphorus,aluminum,silicon are high, belong to those kind of iron ore that extremely difficult to choose from. Due to the fine mineral particles prone to mutual solidarity and slime cover, causing the deterioration of the final flotation. It should be adopted dispersed-selective flocculation-flotation method to achieve reduced phosphorus and increased iron。After added disperse agent, in the DLVO theory, dispersion stability of the pulp system is decided by Vander Waal force potential energy, space resistance potential energy and double-electrodes layer potential energy. In the flocculation step, flocculant selective absorption of mineral negatively charged ions, get the mineral grains to sink, flocculation resulting concentrate and through the further reverse flotation can get a high iron content of concentrates.The conclusion of this experiment mainly include:(1)By strong magnetic separation experiments to determine the optimal current 18A, improve the iron content from 43.71wt% to 51.30wt%, reduce the phosphorus content from 0.93wt% to 0.66wt%.(2)Through single factor experiment to determine the optimal dispersant is hexametaphosphate, it can make the dispersion efficiency reach 85%. (3)We modified the common flocculant and get modified polyacrylamide, it can make pulp effective flocculation. After flocculation experiment iron increase to 51.94wt%, phosphorus drop to 0.44 wt%. (4)Through flotation experiment and get the best flotation condition, including inhibitors, activator, flotation agents and pH environment, etc. The final result of flotation experiment is iron increase to 55.54wt%, phosphorus content reduce to 0.420wt%, The iron content improved 12.71wt% compared with originally mine. The phosphorus content decreased 0.51wt%.This experiment research three stages of mineral processing technology conditions got a kind of effective process method to high phosphorus hematite. It provides an effective means to China's future development of low-grade iron ore.