Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Abstract

In this study, the effect of sodium pyrophosphate (NaPP) on the separation of apatite from dolomite by flotation was systematically investigated. Flotation results revealed that NaPP could selectively depress the flotation of apatite, thus realizing the separation of apatite from dolomite. Further, the selective depression mechanism of NaPP was studied through zeta potential measurements, contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis. The results demonstrated that the adsorption of sodium oleate (NaOL) onto apatite surface was depressed by the preferential interaction of NaPP with active Ca sites. For dolomite, while the presence of NaPP hindered the interaction of NaOL with active Ca sites, it appeared to enhance the reactivity with active Mg sites. Thus, the adsorption of NaOL onto dolomite surface was hardly influenced. In this way, the separation of apatite from dolomite was achieved.

Review on Beneficiation Techniques and Reagents Used for Phosphate Ores

“…H 2 PO 4 − prefers to bond with calcium ions exposed on the surface of apatite, resulting in the reduction of available active sites [44]. In that case, inorganic acids and various phosphate salts, such as potassium dihydrogen phosphate and sodium pyrophosphate, can be used as an efficient depressant for apatite [46,47]. In addition, it was reported that the addition of sulfate or oxalate salts can enhance the depression of apatite in acid media [48,49].…”

“…Silicate minerals Sodium silicate [36,52] Sodium and calcium lignin sulfonates [53] Copolymers or terpolymers derived from acrylamide units and N-acrylamidoglycolic acid units [54] Carbonate minerals Carboxymethyl cellulose, citric acid, naphtyl anthyl sulfonates [42] β-naphthyl sulfonate formaldehyde condensate [43] Phosphate minerals Potassium dihydrogen phosphate, sodium pyrophosphate [46,47] Sodium tripolyphosphate, fluosilicic acid, diphosphonic acid, starch [50] Cashew gum [55] Sulfuric acid, phosphoric acid [46,56] Alkyl phosphate acids, hydrofluoric acid [57,58] Dipotassium hydrogen phosphate [59] Cellulase enzyme [60] Iron/aluminum sulfate, tartaric acid [61,62] 3.2.2. Collectors…”

Comparative morphological, thermal, and mechanical characteristics of doped bentonite and dolomite natural clay fillers into high‐density polyethylene

“…This diffraction peak matches plane (104) of dolomite reflections (JCPDS files card 79-1342). 34 Also, the reflection peaks of dolomite corresponding to (104) plane to indicate asymmetry. In addition, three other less intense diffraction peaks were characterized at 2θ = 24.0 , 35.3 , and 44.8 for the planes (101), (015), and (021) reflections, respectively, corresponding to the conventional hexagonal, and Bravais-Miller indices.…”

Separation of Oxidized Pyrrhotite from Fine Fraction Serpentine

“…Meanwhile, a new peak (398.88 eV) was observed after OHA treatment, as shown in Figure 8, which may correspond to an "O, N" four-ring chelate [30]. With reference to the data from the United States National Institute of Standards and Technology (NIST) [29], the binding energy of 531.35 eV corresponds to Fe(OH) 3 , which indicates that a hydrophilic substance on the surface of oxidized pyrrhotite (ET = 24 h) is mainly Fe(OH) 3 . As can be seen from Figure 7, a new peak (529.27 eV) has been observed after OHA treatment, which may be consistent with the result, presented in Table 5, that the peak corresponding to the "O, O" five-ring chelate, in which Fe(III) chelates with OHA [24,30,31], as well as the peak area of O1s, were reduced by 20.93%, from 128,494.2 (a.u.…”