Abstract
The floatability of magnesite, dolomite and quartz is a major factor affecting the removal of silicon and calcium from magnesite ore. The effect of the regulators sodium hexametaphosphate (SH), sodium silicate (SS), trisodium phosphate (TP), tannic acid (TN) and monoammonium oxalate (OA) on the floatability of magnesite, dolomite, and quartz under the ether amine (EAH) system was studied. The results show that the five regulators have relatively little influence on the floatability of quartz and magnesite. Dolomite can be activated when the dosage of SH is less than 40 mg/L; however, dolomite can be inhibited when the SH dosage is greater than 40 mg/L. The other four regulators have inhibitory effects on dolomite, and TN and TP have strong inhibitory effects on dolomite. Under the conditions of optimum grinding fineness, pH and collector dosage, a recovery of approximately 70% and a concentrate with a grade of over 47% were obtained by three stages of reverse flotation using sodium hexametaphosphate and water glass as regulators and Haicheng magnesite ore with an SiO2 content of 2.38% and a CaO content of 0.75%. Potentiometric measurements and infrared spectroscopy analysis show that physical adsorption occurs between the three minerals and collectors, while the interaction of magnesite and dolomite with SH and SS involves both physical adsorption and chemical adsorption.
Highlights
The magnesite ore used in the test was taken from the Haicheng Pailou mining area (Haicheng Magnesium Ore Refractory Material Plant)
The ore was crushed, screened and mixed in the laboratory to prepare a − 2 mm sample, a small amount of ore sample was taken for laboratory analysis, and the rest was stored for later use
The single minerals magnesite, dolomite, and quartz were taken from the Haicheng Magnesium Mine Refractory Material Plant, Rongcheng Town Yuxi Ma Steel Dolomite Mine and Inner Mongolia Chifeng Quartz Mine, respectively
Summary
The pure minerals to be tested were added to the aqueous solution containing a certain dose of flotation agent in a certain proportion, the pH was adjusted with hydrochloric acid, and the mixture was fully stirred. It was filtered, washed with distilled water, and placed in an oven for drying. Under the conditions of a collector dosage of 150 mg/L and a pH of approximately 5, the effects of the dosage of the five regulators on the floatability of magnesite, dolomite and quartz were investigated. Under the condition of CaO/SiO2 ≥ 2, the quality of the concentrate with a low CaO content is better
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