Research on Technology of Wastewater Treatment from Scheelite Flotation

Abstract

Wastewater from scheelite flotation tailings slathered a lot of sodium silicate in the flotation process, a large number of silicate minerals residues remain in the wastewater, forming suspension bodies difficult to be naturally subsided. With high concentration of suspended substance and pH of 11 or more, this kind of wastewater belongs to unmanageable mine wastewater. Research shows that, pretreating the waste water with Sulfuric acid and calcium chloride, adjusting pH to 7-8 and adding polyacrylamide on flocculating-sedimentation combined can remove suspended solids effectively, offering theoretical basis for wastewater recycling and disposing mine wastewater, which is of great importance.

Treatment and Recycling of the Process Water in Iron Ore Flotation of Yuanjiacun Iron Mine

“…In iron ore flotation process, a large amount of NaOH is taken to adjust the pH. The wastewater pH of iron ore is more than 9, so physicochemical treatment of iron wastewater from a certain degree is rather difficult [9]. At present, the common methods of treatment of wastewater from flotation are acid-alkali neutralization [10,11], precipitation, coagulation, and sedimentation [12][13][14][15], chemical oxidation degradation [16], constructed wetland [17][18][19], ion exchange method [20], adsorption method [21,22], and biological method [23,24].…”