Jun 01, 2019 In this study, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was introduced as a depressant for the flotation separation of apatite from calcite. The micro-flotation test results showed that good floatability of both apatite and calcite were obtained at around pH 8.5 when using sodium oleate (NaOl) as collector.
Sep 23, 2020 Overall, most of the studies reported optimum flotation conditions of calcite recovery above pH 8 with anionic collectors. A few researchers have claimed that calcite flotation is independent of pH and some other studies showed that the depression of calcite is possible between pH 8 and 10 while separating it from other salt-type minerals.
Flotation of calcite and apd.U te as a functif)n of the concentration of potassium oleate under tlle s Iff conditions is given in Figure 1. ... depression of apatite by phosphate in the acidic regou. 1he depression of - 4 - - --pati A by Phosphate (H2PO4IHPO4 ) could be due to the specific adsotior. of phosphate ions on the Ca-sites of ...
The flotation response of malachite, calcite and quartz to bis (2-ethylhexyl) phosphate (DEHPA), dibutyl phosphate (DBP) and tributyl phosphate (TBP) was evaluated by micro-flotation experiments. The results showed that DEHPA exhibited an impressive flotation selectivity for malachite against calcite/quartz in the pH range of 6.09.0 and ...
Flotation of the phospho-chem and phospho-clasts size fractionThe following conclusions could be reported1. It was easy to float calcite at pH 4.5, without chemical depression of phosphate. Actually, the depression of this latter mineral at this pH was so strong, sometimes, to clog the performance of the cell impeller. 2.
Flotation Developments Best Practice - International Mining. Nov 4, 2013 ... His lecture Size matters- coarse and quick flotation can reduce costs ... found where Wemco mechanisms were replaced by these mechanisms. ..... copper gold, gold, carbonaceous gold, nickel, phosphate ores and coal. ... in ore mineralogy and poor pyrite depression even at very high dosages of
In reverse fatty-acid anionic flotation, the depression of phosphate mineral with orthophosphoric acid produces satisfactory results for calcareous as well as dolomitic phosphate ores from several ...
Mar 19, 2018 How calcite and silica can be depress in froth flotation of fluorite? I have already tried sodium silicate and quebracho. ... you can try hexa metha phosphate(HMP) or activated sodium silicate by ...
The acidic flotation process of carbonates at pH 4.5-5.0 followed by a direct phosphate flotation uses phosphoric acid as depressor of apatite during carbonate flotation. The mechanism of apatite depression is rather hypothetical because of lack of data on the surface speciation in such a complex mineral suspension.
The way to successfully upgrade a phosphate ore is based on the full understanding of its mineralogy, minerals surface properties, minerals distribution and liberation. The conception of a treatment process consists of choosing the proper operations with an adequate succession depending on the ore properties. Usually, froth flotation takes place in phosphate enrichment
In this study, conducted in a laboratory scale, eight different depressants, organic and inorganic, were tested in the direct flotation of a Brazilian silicate-carbonate phosphate ore. The best performance in the depression of calcite and silicates was achieved with cassava starch.
Supernatants of apatite and even that of calcite depressed the flotation of calcite markedly in the pH range of 5 to 13. Addition of Ca(NO3)2, K2CO3, and K3PO4 also produced definite effects under various pH conditions. Apatite flotation was also affected by the mineral supernatants and by carbonate and phosphate solutions.
With fluorite and apatite there is a minor effect, but with scheelite very little effect The effect with phosphate is shown above for the flotation of phosphate. Flotation of calcite with 5x10-4 oleate and 5x10-4 sodium silicate Flotation of apatite with 1x10-4M oleate with/without silicate addition Depressants for semisoluble salts Starches, etc.
Therefore, a reverse flotation strategy is used to separate dolomite from apatite in phosphate flotation plants . Using such strategy, apatite is depressed with sulfuric or phosphoric acid (H 2 SO 4 /H 3 PO 4), whereas dolomite can be floated with a fatty acid collector, such as oleate, in a weak acidic solution .
The observed optimum flotation of calcite and dolomite by carboxylic acids as a function of the starch consumption, and the subsequent depression of flotation,... Read more. a screening study on phosphate depressants for beneficiating florida ...
The results obtained for the pH dependence of flotation of calcite using 10 -4 kmol/m 3 potassium oleate at two levels of pH. 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 100% around pH 13.
otassium lauryl phosphate concentration and pH values in micro-flotation of smithsonite and calcite were analyzed. In order to depress calcite, sodium hexametaphosphate (SHMP), water glass (WG), carboxymethyl cellulose (CMC) and lignosulfonate calcium (LSC) were used as depressants. he flotation separation of smithsonite and calcite was T
Jul 02, 2015 On the other hand, flotation of calcite at pH 7 (about 90 % flotation recoveries in presence of l 10 3 M KH 2 PO 4) and its depression at pH 7.58 can be explained as follows. The minimum Ca 2 concentration required to just precipitate Ca 5 (PO 4 ) 3 (OH) at pH 6.5 in the presence of l 10 3 M KH 2 PO 4 is only 10 4.3 (5 10 5 ) M (Table 1 ).
Sep 14, 2011 The flotation response of apatite and calcite using of fatty acid collectors were investigated. Several kinds of phosphate minerals depressant were also evaluated. Phosphoric and sulfuric acids successfully depressed sedimentary phosphate minerals. A mixture of (Na,K) Tartarat and aluminum sulfate had a maximum effect on phosphate mineral depression.
Jul 01, 2020 Within the range of pH 6.59.3, the separation of apatite from gangue mineral calcite can be achieved by flotation in the case of SPP as a depressant (120 mg/l) and NaOL as a collector (20 mg/l). The different components of pyrophosphate and its complexing ability had significant influence on separation.
May 12, 2018 On the other hand, several depressants were tested. The flotation of calcite alone or from phosphate slimes using potassium oleate as a collector and in the presence of potassium dihydrogen phosphate (KH 2 PO 4) as a phosphate depressant was studied (El-Mofty and El-Midany 2015 Mitzmager et al. 1966).
from the natural phosphate ore. The flotation experiments were carried out to apply this new process using the calcareous phosphate ore. Under the optimum flotation conditions, 0.04% cellulase and 0.5 mM oleic acid, a phosphate concentrate containing 0.89% MgO with a P 2 O 5 recovery of 75% was obtained from the phosphate ore containing 2.2% MgO.
Flotation reagents, especially regulators (activators, depressants, and pH regulators) and collectors, impact the selective separation of phosphate minerals from impurities, which are usually carbonates (calcite and dolomite) and silicates (quartz).
values above 10, calcite depression was observed even in dilute silicate solution. A concentrate with 25.6 % P205 at 80 % recovery was obtained. Efforts to concentrate high-dolomite Florida phosphate ores by flotation, using conventional fatty-acid/fuel-oil flotation Liewellyn, 1982, showed that sodium silicate
of lhe greal challenges in phosphate froth flotation with high carbonate conlents is lo produce coneentratcs with smaller Ca0/P20 5 ratios, since the apalile and the calcite have similar superficial propertics. which rcsult in low sclccti vity bctwcen these
for flotation of phosphate-containing miner- als at pH values used. Sodium silicate is the most widely used modifi- er in non-sulphide minerals flotation. The reagent depresses silicate minerals significantly in flotation of different kinds of ores and can increase efficiency of calcium minerals separa- tion (Bogdanov et al., 1990).
achieved by controlling the flotation pH and PA-Na dosage. Keywords scheelite, calcite, flotation, sodium polyacrylate, selective depression 1. Introduction Calcium-bearing minerals such as scheelite, calcite are important industrial minerals, they can be used as raw materials for production of spaceflight, cement and so on.
these minerais that are presenl in carbonated Brazilian phosphate rocks and are concentrated by froth flotation. 2-MATERIALS AND METHODS ln this work mineral samples of apatite, calcite and dolomite were used in lhe size range from 147 to 44Jlm. Their chemical compositions are presenled in Table II.
Calcite Depression in Fluorite Flotation Pionera F-220 and F-100 reduce calcite recovery in fluorspar flotation. Read more Bismuth Depression Chalcopyrite Flotation Pionera F-200 shows reduced bismuth recovery in copper flotation compared with cyanide. ...
Cassiterite is the most common and important tin-bearing mineral, and calcite, a primary gangue mineral is generally found in tin deposit. The flotation separation of cassiterite from calcite remains a challenge due to their similar response to traditional reagents. In cassiterite flotation, sodium oleate (NaOL) and sodium silicate (SS) have been widely used as a collector and a
The depression behavior and mechanism of guar gum on talc-type scheelite flotation were systematically investigated by flotation experiments, adsorption tests, zeta-potential measurements, and infrared spectroscopic analyses. The flotation results for monominerals, mixed minerals, and actual mineral samples indicated that guar gum exhibited much higher
Oct 13, 2018 Calcite, on the other hand, is best floated with a starvation collector concentration at pH 10. Obviously flotation rate can be used to affect a separation between these minerals (especially for the rejection of calcite), though additional studies to evaluate the influence of particle size are in order. Activation and Depression
US3844412A US30887472A US3844412A US 3844412 A US3844412 A US 3844412A US 30887472 A US30887472 A US 30887472A US 3844412 A US3844412 A US 3844412A Authority US United States Prior art keywords mineral algae powder flotation minerals alginic acid Prior art date 1969-06-25 Legal status (The legal status is an assumption and is not a
Calcite samples. Calcite samples from different origins and genesis were first purified and characterized, and then submitted to dissolution and flotation experiments. Most of the calcite samples (CAM, CCI, CCJ and CSQ) were purified from phosphate ores that are exploited by different mining groups.
The Depression of Sphalerite during Carbon Pre-flotation ... 2017-2-20 during pre-flotation significantly reduced the bulk flotation action and entrainment of sphalerite in the froth, (b) grinding the ore finer (P 80 40 m) reduced the recovery of sphalerite as composite particles during lead flotation, and (c) the pulp pH was.