The flotation experiments and contact angle measurements indicated that the selective depression effect of sodium carbonate on the calcite mineral is more than that of calcium chloride.
Flotation studies have shown a possible depression of carbonaceous matter in the size of grinding 60 % class -0.074 mm and isolated in a separate concentrate of free gold, and when grinding the ...
The depression of pyrite flotation by cyanide may result from one or more of the following mechanisms: (1) Cyanide may depress pyrite flotation by replacing xanthate ions on pyrite surface, similar to hydroxyl ions (Wark and Cox, 1934; Prestidge et al., 1993).
Interestingly, flotation at the minimum is found to increase from about 25% to 85% with increase in KNO3 from 0 to 3 x 10-2 kmo1/m3. Flotation again increases to about around pH 13. …
Complete flotation of chalcopyrite is possible from pH 3 to pH 12 with ethyl xanthate. Both electrochemical oxidation of xanthate to dixanthogen as well as chemisorption of xanthate on …
metallic cations are added in the flotation process, suggest that depression by metallic cations can be linked to their adsorption onto the mineral surface [25,29,52–54] . A t alkaline pH, the ...
Effect of various modifiers on Mg carbonate flotation in different conditions. 5.2. Depression of Mg Carbonates Various investigations have indicated that flotation of Mg carbonates poses several difficulties where the fatty acids and their derivatives, which are used as collectors, have a poor selectivity for carbonates and phosphate minerals ...
In this paper it is recommended that pyrite is to be separated as froth from arsenopyrite by selective depression of arsenopyrite in strong alkaline medium (1), by oxidation with chlorinated lime (II), by co-use of chlorinated lime with sodium carbonate (III), and by modification with `L' reagent (know-how) without filtering to get rid of residual copper ions after Cu activation (IV). …
Solution chemistry, zeta potential and Fourier transform infrared spectroscopic measurements were performed to study the mechanisms of selective depression of sulfide minerals by thioglycollic acid/citric acid during the flotation of carbonate minerals by sodium oleate.It was observed that the addition of the mixed depressants (thioglycollic acid and citric …
WANG et al [15] investigated the depression mechanism of a combination of zinc sulfate (ZnSO4) and sodium carbonate (Na2CO3) on talc flotation, suggesting that the ZnCO3 or Zn(OH)2 precipitated on talc surfaces and then depressed the talc flotation.
The results of this study showed that sodium silicate can replace sodium carbonate and inhibit talc flotation in combination with zinc sulfate; the associated depression mechanism was also ...
Read 2 answers by scientists to the question asked by Nikolay Stenin on Feb 9, 2022
What kind of carbonate minerals depression is preferrable for Au-bearing sulfides flotation (may be reverse flotation?) for such an ore:quartz - 10-30%feldspar (orthoclase) - 5-40%clay&mica - 20-30%Fe-dolomite&ankerite - 5-60% (!)FeS2 - 1-8%FeAsS - 0,5-3%AsS - 0,2-2%ZnS - 0,1-4%PbS - 0,1-1%Gold is mainly assotiated with Py and AsPy. There are also 0,5-5,0 mkm …
species follow the order of hydroxy calcium>iron carbonyl>calcium carbonate. Overall, hydrophilic species repulse adsorption of dixanthogen and significantly reduce the flotation performance of pyrite. Keywords: yrite, p calcium hypochlorite, lime, depression, ow alkaline system 1. Introduction Pyrite (FeS 2
DOI: 10.1016/s1003-6326(23)66203-x Corpus ID: 259467855; Depression mechanism of ZnSO4 and Na2CO3 on talc flotation @article{Li2023DepressionMO, title={Depression mechanism of ZnSO4 and Na2CO3 on talc flotation}, author={Jia-lei Li and Yin-yu Ma and Guang-li Li and Zhi-cheng Liu and Shuai Ning and Bin Pei and Zhao-you Lang and Rui-zeng Liu and Dian-wen …
While it is clear that flotation or depression depends upon the balance of hydrophobic and hydrophilic species on the surface, the finding above indicate that several ionic equilibria can modify pyrite surfaces only by a change in pH (He et al., 2005, López Valdivieso et al., 2005). In real ore systems, many ionic species can modify the ...
In froth flotation separation, the first use of polysaccharides dates back to 1928 and has continued up to now [34].Although several polysaccharides have been recently synthesized and extensively used for pyrite depression in different mineral processing plants, no comprehensive review article has universally explored their adsorption mechanisms, …
Flotation tests indicate that the effective depression of talc flotation occurred in the pH range of 79. In this pH range, speciation calculations for the mixed s− olution of ZnSO 4 and Na ... and sodium carbonate (Na 2CO 3) on talc flotation, suggesting that the ZnCO 3 or Zn(OH) 2 precipitated on talc surfaces and then depressed the talc ...
Depressants play a crucial role in both direct flotation and reverse flotation of minerals [13–16]. In order to separate apatite from carbonate minerals (dolomite or calcite) using the direct flotation …
The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements (FBRM), and Particle Vision Measurements (PVM).
DOI: 10.1016/j.colsurfa.2021.127691 Corpus ID: 240754316; Depression behavior and mechanism of sodium silicate on bastnaesite and parisite flotation @article{Wang2021DepressionBA, title={Depression behavior and mechanism of sodium silicate on bastnaesite and parisite flotation}, author={Jieliang Wang and Zeyu Cheng and Yiwen Hu …
carbonate and phosphate can be somewhat altered.. in the presence of one another. Carbonate and phosphate species can be expected to chemisorb - --on the calcite surface and thus can compete with oleate for the surface Casites resulting in flotation depression. Ca on the ~ - - -
Scanning electron microscopy-energy-dispersive spectroscopy results showed that depression of sphalerite (Pb2+ activation) by the combined depressant generated numerous precipitates.
We investigated the depression performance of the combined depressant [K 3 [Fe (CN) 6] + ZnSO 4 + Na 2 CO 3] in a mixed Pb–Zn sulfide flotation system.
Micro-flotation tests were carried out to investigate the influence of Fe 3+ /Ca 2+ on CMC's depression effect towards chalcopyrite flotation. Fig. 2 depicted the flotation behavior of chalcopyrite at different pH conditions. The pristine chalcopyrite showed good floatability and its recovery was maintained at around 80% within detected pH 4 ...
The principle of reverse flotation is that valuable minerals are sunk [4, 5]. Due to these minerals similar soluble properties and structures, direct flotation is inefficient. Therefore, reverse flotation of carbonate gangue and depression of apatite has been practiced by predecessors [4, 6]. Thus, the understanding of depression mechanism of ...
In order to compare the effects of the reagent additions on lead and zinc flotation behaviour, the flotation data were subjected to analysis using the first order rate equation given below: (1) R (t) = R max (1-exp (-kt) where R(t) is the recovery of mineral at time t, R max is the theoretical maximum recovery (at infinite time by curve fitting the experimental data) and k is …
Both magnesite and calcite are carbonate minerals with high solubility in slurry. The dissolution of these minerals releases metal ions into the flotation system, which adsorb onto mineral surfaces, causing their properties to converge and complicating the separation process [21], [22].Chelating reagents can selectively bind Ca 2+ and Mg 2+ ions in the slurry, showing …
The sole use of organic molecules (starch, lignin sulfonate, tannin, carboxymethyl cellulose, and citric acid), instead of sodium silicate, was also studied. This led to a global …
Micro-flotation experiments showed that Na 2 SO 3 depressed the floatability of pyrite more strongly than that of galena. Moreover, the depression mechanism of Na 2 SO 3 was observed through contact angle measurements, ultraviolet–visible spectrophotometry (UV–Vis) analysis, and time of flight secondary ion mass spectrometry (TOF-SIMS ...
The effects of ZnSO4 on arsenopyrite depression were studied with sodium carbonate and sodium isobutyl xanthate (SIBX) as the pH regulator and collector, respectively. In ... Zn ions are widely reported to possess a depression effect on sphalerite in flotation. The effective adsorption of Zn ions on a sphalerite surface is critical to realize ...
Zinc sulfate is a commonly used selective depressant for zinc sulfide minerals, and a mixture of ZnSO 4 and Na 2 CO 3 is an effective combined inhibitor for talc. This study indicated that only using ZnSO 4 could inhibit talc in chalcopyrite flotation and its depression mechanism was investigated. Microflotation tests indicated that ZnSO 4 could selectively depress talc …
Thus, sodium carbonate is commonly used in flotation as a pH modifier [57]. Moreover, its addition prior to sodium silicate produced positive synergistic effects on gangue mineral depression ... thereby leading to optimized gangue mineral depression in the floatation process. These conditions were established as: ...
Calcite flotation from a carbonate phosphate ore by CO 2 as the apatite depressant has also been reported . ... investigated the feasibility of polyacrylamide, which contains both –OH and –COOH functional groups, for the depression of apatite and the flotation of siliceous gangue in the cationic collector system. The results showed the ...
Depression of pyrite by dextrin in flotation with xanthates has been studied. The adsorption of dextrin and xanthates at the pyrite/aqueous solution interface has been investigated through electrokinetics, Raman spectroscopy and batch adsorption ... Non-floated fractions showed high amounts of carbonate, and presence of hydroxyl iron sulfate ...
Arsenopyrite can also be activated by copper during mineral processing [13, 14]; hence, the depression of the Cu-activated arsenopyrite was required. As depicted by Fig. 2, the addition of copper ions significantly improved the flotation performances, but failed to greatly increase the floatability difference.
