Flotation separation of iron bearing minerals and quartz sand by PTMS magnetic separator: the zero-electric point of iron bearing minerals in quartz sand impurities is mostly above 5, and it is positively charged in acidic environment, which is theoretically suitable for anionic collector. For example: iron oxide flotation reagent for fatty acid (soap), hydrocarbon sulfonate or sulfate; Pyrite flotation reagent for xanthate, dosage of about 200ppMW; Ilmenite flotation reagent generally uses sodium oleate (0.21mol/L) to adjust the pulp pH value to 4-10. In addition, hydrocarbon phosphoric acid collectors have good selectivity and collection performance for ilmenite.
Flotation separation of apatite minerals and quartz sand by PTMS magnetic separator: The phosphate minerals in quartz sand generally exist in the form of apatite, and the surface dissolution of apatite in flotation pulp will change the surface properties of minerals and the chemical environment of flotation pulp. Generally, quartz sand is easily activated by Ca2+ under alkaline conditions (pH > 10), so Ca2+ dissolved in apatite solution can adversely affect the separation of apatite and quartz sand. Since the floatability of apatite is better than that of quartz, Na2CO3 can be used as pH regulator to improve the floatability of apatite and increase the difference of floatability between apatite and quartz sand. Therefore, it is recommended to choose Na2CO3 as pH regulator and sodium silicate as inhibitor in the flotation separation of apatite and quartz sand under alkaline conditions.
In addition, fatty acid soap anionic collector can be used for the flotation separation of apatite minerals from quartz sand by PTMS magnetic separator, such as sodium oleate, oxidized paraffin soap, tar oil and so on. It should be noted that fatty acid flotation apatite will be affected by factors such as water quality and temperature, and mineral oil such as oil and kerosene will be weighted to enhance the hydrophobic surface, so as to achieve the effect of co-collection. The results show that the effect of mixed collector is better than that of single collector, which is beneficial to improve the recovery of quartz sand.
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