A study was conducted on the flotation iron removal of a certain quartz sand after settling,desliming,and washing.The effects of conditions such as the type of slurry acid,slurry pH value,slurry preparation time,collector dosage,and flotation slurry concentration on the iron content in the quartz sand concentrate were investigated.The results showed that using sodium dodecyl sulfonate(SDS)as a collector for reverse flotation to remove hematite from the quartz sand can achieve the goal of reducing iron content;The optimal process conditions for flotation iron reduction are that the quartz sand ore is deslimed and graded,106-450 μm grade quartz sand is added for flotation,and hydrochloric acid is used to adjust the pH value of the slurry to 3.The mixing time is 2 minutes,the flotation slurry concentration is 20％,the amount of collector SDS is 400 g/t,and the amount of foaming agent terpineol is 25 g/t.Ultimately,a quartz sand concentrate with a SiO2 content of 98.84％and a Fe2O3 content of only 0.022％can be obtained,meeting the feeding requirements of the colorless glass industry.In addition,through potentiodynamic testing,it was found that when the pH value of the slurry was about 3,it was located in the middle of the isoelectric points of quartz and hematite.At this time,the anions of the collector selectively acted on the surface of hematite,which preliminarily explained the reason for the better removal of hematite under this pH condition from a mechanistic perspective.
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