Flotation Separation of Scheelite from Calcite Using Sulfonated Naphthalene–Formaldehyde Condensate as Depressant

In this paper, the potential of sulfonated naphthalene formaldehyde (SNF) condensate as a depressant in flotation separation scheelite from calcite was verified and investigated. The results microflotation experiments showed that SNF had stronger performance on than conventional depressant—water glass an excellent fine-grained particles (−0.037 mm) treatment. Adsorption tests were conducted to quantitatively study selective adsorption surface calcite. At 200 mg/L SNF, density reached 5.48 mg/g, which more four times scheelite. addition, compared with scheelite, significant negative effect contact angle. Moreover, infrared (IR) measurements combined X-ray photoelectron spectroscopy (XPS) analysis performed investigate mechanisms surfaces. likely be physical attraction, while –SO3− group could chemically react Ca species calcite, resulting