The ore was beneficiated by froth flotation using sodium oleate as collector at varied concentrations of 3 g/kg, 7 g/kg and 10 g/kg. Other chemical reagents used were sodium silicate, fuel oil and calcium hydroxide as dispersant, frother and pH modifier respectively. Results obtained showed percentage metal recoveries of 9.29 , 14.30 and 19.61
and the interaction effect between pH and conditioning time. Keywords: phosphate flotation carried out with a Denver D12 laboratory flotation cell using 500 g of ore sample based on a fractional factorial design, while first order flotationic models were used to assess the influence of these parameters on the flotationics. Starch, NaOH, FLO Y S20, and
The effect of pH on flotation, determined using a washed coal sample, was found to be significant, especially above pH 8, with the floatability faDing sharply with pH increase. The effect of interaction of the dissolved mineral species with OH depended on the path of
shown that though concentration or Eh induced by potential modifiers may affect the flotation performance of sulphide ores, the most dominant factor that has shown to have a greater impact is the nature of the potential modifier. Comparing the findings of this work to
There are multiple factors that affect the efficiency of adsorption in chemical, thermodynamic, and physical domains. These factors can range from surface energy and polarity to the shape, size, and roughness of the particle. In froth flotation, adsorption is a strong consequence of surface energy, since the small particles have a high surface area to size ratio, resulting in higher energy
It has been reported that the pH during flotation process provides a good deal of information an the state of oxidation of coal and In this paper, the effects of oxidation, pretreatment and dissolved species on coal flotation are discussed. Figure 1 shows the zeta potentials of coal, coal pyrite and alumo silicate minerals as a function of pH.
A~traet This paper studies the influence of two pH modifiers, namely sodium hydroxide NaOH and sodium carbonate Na2CO3, on the flotation of celestite ore using sodium oleate as the collector and quebracho as the depressant.
Furthermore, flotation efficiency using sodium silicate was better more than that using lime in the alkaline conditions pH 9.511. It was demonstrated that sodium silicate could be used not only as pH modifier but also as depressant/dispersant of slime.
TECHNICAL NOTE THE EFFECT OF pH MODIFIER ON NaOH as pH modifier NaOH was used as the first pH modifier in view of its widespread use in mineral concentration methods using flotation Bearing in mind the results obtained in a previous paper 3 pH in the flotation tub was set at 105 and the Flotation Conditioners Modifiers Activators Depressants
The effect of pH modifier on the flotation of celestite with sodium oleate and sodium metasilicate This paper studies the influence of two pH modifiers, namely sodium hydroxide NaOH and sodium carbonate Na2CO3, on the flotation of celestite ore using sodium oleate as the collector and sodium silicate Na2SiO3 as the depressant.
The presence or absence of dissolved oxygen in the circuit, together with determinative changes in pH and Eh, can directly affect flotation recovery and selectivity. In previous case studies, a variety of methods for control of solution species, precipitates, adsorbed species and surface layers have been trialled including: Reagent replacement.
to promote the flotation. The lime is added during the grinding of the material and in the second flotation bank cell in order to achieve a pH value of approximately 9,5. The DPR is fed on average with a flow rate of 220 ton/hour containing 30 of solids in weight.
When the pH of the flotation system was 10, the recovery of Cu in the concentrate was the largest 93.35 , indicating that IBET has the best flotation effect on Cu at pH = 10. As IBET dosage increases, Cu recovery in the concentrate also increases. The recovery tended
The adjustment of pH in the flotation tub, by the addition of acids or alkalis Leja, 1982, affects the extent to which hydration of solid surfaces occurs, excess of load density and the zeta potential effect.
Flotation is a process in Liquid Solid Separation technology whereby solids in suspension are recovered by their attachment to gas usually air bubbles, usually with objective of removing the solids from the liquid. The particles most effectively removed are in the size range from 10 to 200 μm. The particle bubble aggregates that are formed have a density less than the suspension
Modifiers include activators, pH regulators, depressants, dispersants and flocculators. The open literature on the frothing capacity of column flotation column is limited. A review of the flotation columnp, circuit and bubble genearation has been carried out by Dobby and Finch . Finch also has reviewed about the various types of flotation columns. The most important parameter
When the pH of the flotation system was 10, the recovery of Cu in the concentrate was the largest 93.35 , indicating that IBET has the best flotation effect on Cu at pH = 10. As IBET dosage increases, Cu recovery in the concentrate also increases. The recovery tended to be flat when the dosage exceeded 17 g/t.
In some cases, an alcohol type of frother may give a brittle froth, which is also difficult to remove from the cell. Choice of modifiers and their effect on flotation In most operating plants, lime is used as a pH modifier as well as for the depression of pyrite during the cleaning operation. Only in a small number of plants, an alternative pyrite depressant is used. The flotation pH in the
The adverse effect of the underground water was successfully negated by adding lime into the primary ball mills and increasing the pH of the slurry, from a natural pH of 8 to the flotation pH of 10.5. Traditionally, the pH modifier, quicklime, had been added downstream of the milling.
For example, Cruz et al. studied the effect of flotation reagents including pH modifiers NaOH, lime, and Na 2 CO 3, collector potassium amyl xanthate, and frother Interfroth 6500, which are normally used in copper gold flotation, on the rheological behaviour of kaolinite and bentonite suspensions. All these reagents were found to alter the rheological behaviour of the kaolinite
A high pH is important in copper ore processing to maximize this minerals flotation properties. Most copper ore slurries tend to be acidic. Plants typically add lime to the slurry in the mill or floatation circuit, increasing its alkalinity. A typical copper operation contains many flotation cells, often with a pH sensor in each cell.
Relative significance of flotation parameters based on difference between max and min. values indicates that pH has the most significant effect on the recovery of nickel, copper and
The effect of pH modifier on the flotation of celestite with sodium oleate and sodium metasilicate This paper studies the influence of two pH modifiers, namely sodium hydroxide NaOH and sodium carbonate Na2CO3, on the flotation of celestite ore using sodium oleate as the collector and sodium silicate Na2SiO3 as the depressant.
The flotation recoveries of the prepared minerals at pH 8.70 ± 0.20, using oleic acid at a concentration of 6.010 4M are demonstrated in Figure 3. It is shown there, that the flotation recovery of spodumene increases after leaching treatment in NaOH solution. It can be seen that the bigger of the NaOH dosage, the higher recovery is achieved.
Effect of pH modifier on flotation of celestite 991 at 10 2 M, giving rise to intense mineral depression. G~ilvez, found a similar effect of the depressant Na2SiO 3
and Ph.D. Natalia Petrovskaya The model allowing to describe correctlyics and speed of flotation of raw mineral material of any kind are proposed. The model take into account delay in extraction ofponent in concentrate, upper limitponents extraction, inclination of e t parameter* and can be considered as universal analytical tool for investigation ofics and
In flotation, pH control is a vital method to control selective mineral separation. A standard depressant that is used is an Alkali. An Alkali is any substance that when mixed with Acid will neutralize each other and form a new chemical substance called a BASE. This is very important. The ore may be either alkaline or Acidic. To have a positive control over flotation, it is necessary to be
There are multiple factors that affect the efficiency of adsorption in chemical, thermodynamic, and physical domains. These factors can range from surface energy and polarity to the shape, size, and roughness of the particle. In froth flotation, adsorption is a strong consequence of surface energy, since the small particles have a high surface area to size ratio, resulting in higher energy
The flotation recoveries of the prepared minerals at pH 8.70 ± 0.20, using oleic acid at a concentration of 6.010 4M are demonstrated in Figure 3. It is shown there, that the flotation recovery of spodumene increases after leaching treatment in NaOH solution. It can be seen that the bigger of the NaOH dosage, the higher recovery is achieved.
The impeller of the flotation cell was turned on and maintained at 850 rpm. 3. Calcium hydroxide was added to raise pH to 10 and the slurry was aerated for five minute before further conditioning. After which 20 ml of feed sample was drawn using micro syringe.
01/09/1996· NaOH as the pH modifier NaOH was used firstly as a pH modifier in view of its widespread use in mineral concentration opera tions by flotation. Taking into account the results obtained in a previous paper Calero, 1994, the pH selected for the flotation tub was 10.5, and the concen tration of the collector, sodium oleate, 1500 g/Tm.
31/01/2019· The success of the flotation process is largely determined by the interaction of xanthates with the target mineral particles and is mainly dependent on the characteristics of the xanthate and mineral, pH, conditioning time, collector concentration, and so forth. 35 Thus, in order to determine the effect of conditioning time on flotation recovery, the flotation recovery
It has been reported that the pH during flotation process provides a good deal of information an the state of oxidation of coal and In this paper, the effects of oxidation, pretreatment and dissolved species on coal flotation are discussed. Figure 1 shows the zeta potentials of coal, coal pyrite and alumo silicate minerals as a function of pH.
froth obtained in a batch flotation cell as each pulp factor was changed. This study has shown that careful control of the pulp chemistry, namely increasing IS, increasing pH, decreasing DO and decreasing Eh, resulted in improved froth stability.
For example, Cruz et al. studied the effect of flotation reagents including pH modifiers NaOH, lime, and Na 2 CO 3, collector potassium amyl xanthate, and frother Interfroth 6500, which are normally used in copper gold flotation, on the rheological behaviour of kaolinite and bentonite suspensions. All these reagents were found to alter the rheological behaviour of the kaolinite
In flotation of porphyry molybdenite ores or copper molybdenite ores using oil collector, a molybdenite MoS 2 concentrate has mainly been separatedbination of sodium silicate Na 2 SiO 3 and lime CaO at about pH 911.In this research, the role of sodium silicate and the effect of collector kerosene in flotation of Dong won molybdenite ores from Korea have
and the interaction effect between pH and conditioning time. Keywords: phosphate flotation carried out with a Denver D12 laboratory flotation cell using 500 g of ore sample based on a fractional factorial design, while first order flotationic models were used to assess the influence of these parameters on the flotationics. Starch, NaOH, FLO Y S20, and
Dispersive effect of low molecular weight sodium polyacrylate on pyrite serpentine flotation 1203 used as pH regulators. Deionized double distilled water was used for the micro flotation tests, adsorption and zeta potential measurements. 10 20 30 40 50 60 70.0.0.0.0.0 k k k k ¹ ¹ º ¸ i j ¸ ¿ · ¿ · ¿ º j ¸ ¸ i º ¿ ¸ º j j
Modifier: adjust pH of water Activator: cause a mineral to float with a collector when it would otherwise not float. Depressant: prevent a mineral from floating. Example: Starch, guar depress flotation of clays in potash Waatteerr a tmmiinn eerrall ssuurrffaaccee cchhemmiisstrryy:: Water is a polar molecule. Hydrogen atoms have slightly positive charge, oxygen slightly