Study On Separation Of Low Magnesium Weathered Phosphate In The Anning Area

Our country is rich in phosphate rock, constituting22percent of the nations totaljust in Yunnan province. Mining area of the dian lake and xundian has the largestamount of weathered phosphate, constituting30percent of the total reserve.exploitation of the low grade phosphate ores is the important way to satisfy thedevelopment of national economy.Based on the Anning area of Low magnesium weathered phosphate as theresearch object, The aim mineral is fluorapatite,gangue mineral is quartz, muscoviteand so on. The raw ore contains large amount of mud, as16.88%for less than10μm. Inview of the characteristics, The paper processes the pure minerals test and actualmineral test to study the key factor that influence the flotation of the weatheredphosphate and solution.Paper tests the surface properties of phosphate and quartz minal. Investigates therelationship between the zeta potential, wetting contact angle and different amountsdispersing agents. Tests found that adding the same concentration amount dispersingagents, calgon makes the most obvious effect on the zeta potential and makes themaximal absolute value, water glass takes the second place, more obvious thansodium silicate. Conversely, calgon makes the minimum wetting contact angle,sodium silicate makes the minimum impact. Base on the theory that the higher zetapotential absolute value the more power electrostatic repulsion, the smaller wettingcontact angle the thicker hydration shell and the more power hydration repulsion,repulsion is beneficial to dispersing. So water glass can make the dispersing of thefine particle more outstanding than sodium silicate; in addition paper processes thepure minerals flotation test, validates that calcium ion can activate the floatability ofquartz and reduce the recovery rate of phosphate, and appropriate amount of waterglass can raise the recovery rate of phosphatepaper explores the conditions of flotation by the flotation machine, to determinethe grinding fineness, collecting agent dosage, flotation concentration and flotationtemperature. to obtain the flotation results appropriate. Paper processes the dispersingagents test based on the roughing condition. Shows that putting in dispersing agents,lower calcium ion is benefit for flotation index. as the same calcium ion concentration,the glass water can obtain higher grade than sodium silicate when the recovery rate ofphosphate is much the same, it is the reason that the glass water have the more outstanding dispersing behaver than sodium silicate; In addition paper researches theflotation behaver of ore less than10μm, Shows that flotation efficiency of the newgeneration ore less than10μm is better than the raw ore less than10μm, The flotationprocess size characteristics of direct flotation and desliming flotation shows:compared with the smooth flotation process for-22+10μm and-10μm of deslimingflotation. The direct flotation mainly concentrated in the earlier stage, the unorderedflotation of fine particle is the important key that desliming flotation index excelledthe direct flotation index; the stage flotation avoids the loss for recovery rate ofconcentrate ore, but the minus sieve crusher raw ore contains a larger amount of rawore less than10μm, having lower flotation efficiency, and the comprehensive results isnot dominant; flotation column associated with cell is more suitable for wide grainfeed, Test obtains lower P2O5tailings grade by flotation column associated with cellone roughing-one scavenging test.