| Quartz and feldspar are the two most common silicate minerals and two most widely distributed rock-forming minerals in the crust. They are widely used in building materials, glass ceramics, electronic appliances, refractory materials and other fields. However, these two kinds of minerals are very similar in the physical properties, chemical composition, structure and so on, and they occurs in nature often as ecological, associated with each other, or as gangue minerals to be symbiosis with a variety of other useful minerals, therefore, separating the feldspar and quartz ore by flotation become the focus in Mineral processing. At present, several feldspar quartz flotation separation process has been applied in industry field, the most mature and the most widely used method are fluorine floating feldspar and without fluoride acid floating feldspar, but it can not meet the new requirements—he high efficient, inexpensive, non-toxic flotation, so without fluorine oracid has a good application prospect.The main chemical components of potassium feldspar ore which is from Henan province Sanmenxia area as follows:SiO277.90%, A12O311.27%, K2O9.57%, Fe2O30.23%. The main minerals are feldspar and quartz, including small amounts of mica, allanite, rutile and hematite and limonite ore, and the iron and titanium gangue minerals generally exist in weathered feldspar’s surrounding or are wrapped in feldspar and quartz internal. Potassium feldspar for plate column, granular, particle size uniformity, subject to weathering, surface KAOLINIZATION, embedded very closely with quartz, is difficult to separate from quartz.Grinding test shows that, the suitable grinding fineness is about-0.074mm55%. Desliming test showed that, the suitable desliming size lower limit is25μm. Magnetic separation test shows, suitable separation conditions is as follows:the magnetic field intensity0.9T, pulp flow velocity0.8cm/s, thin steel rod as magnetic medium. Finally, the iron removal rate achieve72.60%.Based on the system separation experimental study of ore, comparing the two method:Alkaline pumice EF and Neutral floating feldspar, ultimately determine that the Neutral floating feldspar method is more effective. Alkaline pumice EF, the concentrate containing K2O13.98%, A12O314.68%, SiO270.06%, does not meet the quality standards of advanced ceramic materials. The content of K2O in tailings is high, the separation effect is poor. Neutral floating feldspar, Choose YS and Y-2combination as collectors:YS3360g/t, Y-2480g/t, the dosage of Inhibitor six partial sodium is960g/t.Eventually the flotation concentrate K2O content is15.01%, the content of A12O3is15.89%, the content of SiO2is67.78%.The concentrate index is good, reached the advanced ceramic materials quality standards.And in the flotation tailings, the content of SiO282.54%, the enrichment of Quartz is obviously, it indicated that the separation effect of feldspar and quartz is much better.Zeta potential measurement and infrared spectral analysis show that: Point of zero charge by feldspar and quartz are1.9and2.1, the electrical property in pure aqueous medium are similar. In the YS and Y-2solution, both the dynamic potential trend are similar, so by the static electricity and other physical adsorption is unlikely to cause the floatability changed. Another way of saying, just using anionic or cationic as collector, selectivity is poor, it’s difficult to separate them.The study of inhibitor six partial sodium’s inhibition mechanism found that, six partial sodium phosphate is equivalent to the role of deionized water, which has desorption on the collectors in the feldspar and quartz surface that the adsorption intensity is not high. Desorption test shows, YS in feldspar surface exist both physical adsorption and chemical adsorption, but in the quartz surface adsorption is mainly physical adsorption. |
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