depressants in froth flotation

Flotation Depressants - Mineral Processing Metallurgy

2015-8-12  First let’s change the amount of the Flotation Depressants used. The valuable mineral that isn’t liberated from the unwanted mineral will begin to be depressed along with the waste. For the floatation operator, the change that will become most apparent is, that the color of the froth

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Depressants for froth flotation - Sentrachem Limited

In the commercial concentration of metal sulphides from ores by froth flotation, one or more reagents are often needed which selectively depress one or more of these sulphides from a mixture, thereby permitting the separate recovery of other components of the mixture during or after their concentration from gangue minerals.

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[SOLVED] Role of depressants in froth floatation method In ...

Depressants prevent certain type of particles from forming froth during froth floatation process. A common depressant used in the froth floatation of lead sulphide is sodium cyanide. When the ore containing ZnS and PbS is subjected to froth floatation process in the presence of NaCN, then only PbS forms the froth.

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What is the role of depressant in froth floatation process?

Depressants prevent certain types of particles from forming froth with bubbles. Due to this, we can separate two sulphide ores. For example, sodium cyanide is a depressant used for an ore containing Z nS and P bS. N aC N forms a layer of the complex N a2

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Frother-depressant interactions in two and three phase ...

These polymers are used as depressants in the flotation of platinum bearing minerals. The frothing properties were evaluated through maximum froth height measurements, froth collapse studies and visual observation of the froth structure in air-liquid and air–liquid–solid systems.

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Role of Collectors and Depressants in Mineral Flotation: A ...

2017-11-22  Abstract:A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the depressant-coated

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Flotation Conditioners -Modifiers -Activators -Depressants

2015-8-10  That is a brief explanation as to how those four main groups of reagents will relate to one another, as a brief review, let’s go over the interaction quickly. First there are DEPRESSANTS, they are added to prevent the unwanted minerals from floating.

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The effect of frother type and dosage on flotation ...

The use of high dosages of polysaccharide depressants in order to depress the undesired naturally floatable gangue (NFG) present in ores beneficiated from the Bushveld Complex, South Africa, results in a significant decrease in the stability of flotation froths.

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1 Froth Flotation – Fundamental Principles

2009-8-27  Froth flotation is a good example of an engineering “system”, in that the various important parameters are highly inter-related, as shown in Figure 1. It is therefore important to take all of Chemistry Components Collectors Frothers Activators Depressants pH Equipment Components Cell Design Agitation Air Flow Cell Bank Configuration

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Measurement of froth zone and collection zone recoveries ...

2019-7-1  In the reverse flotation of iron ores, depressants are often used to depress the flotation of iron oxides by modifying the mineral surface properties (Liu et al., 2019, Yue and Wu, 2018). Among the depressants for iron ore flotation are starches. Starches are vital polysaccharides formed by polymerization of

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[SOLVED] Role of depressants in froth floatation method In ...

Depressants prevent certain type of particles from forming froth during froth floatation process. A common depressant used in the froth floatation of lead sulphide is sodium cyanide. When the ore containing ZnS and PbS is subjected to froth floatation process in the presence of NaCN, then only PbS forms the froth.

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US4657669A - Depressants for froth flotation - Google Patents

The invention concerns the use of 5-hydroxy-3-thiazolidine-2-thiones of the structure I ##STR1## where R 1 =(CHOH) m , R 2 =(CHOH) n where (m+n)=0 to 6, and R 3 is alkyl or hydroxy-alkyl as depressants in the flotation of mixtures of base metal minerals, particularly those containing molybdenum, copper, lead, zinc; and to flotation processes using these compounds.

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Frother-depressant interactions in two and three phase ...

The quality and stability of the froth phase in flotation is mainly attributed to the amount and degree of hydrophobicity of solid particles reporting to the froth phase. These two parameters are influenced by the type and quantity of collectors and depressants added to the system. Frothers also influence the quality and stability of the froth ...

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what is the role of Depressant in froth floatation method ...

Depressants prevent certain type of particles from forming froth during froth floatation process. A common depressant used in the froth floatation of lead sulphide is sodium cyanide. When the ore containing ZnS and PbS is subjected to froth floatation process in the presence of NaCN, then only PbS forms the froth.

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The use of selective depressants for the separation of ABS ...

2005-2-1  Froth flotationFraunholcz (1997) investigated a range of depressants for the selective flotation of number of plastics, including ABS and HIPS. Sodium carboxymethyl cellulose (NaCMC), quebracho, tannic acid and polyvinyl alcohol were all found to be effective depressants over specific pH ranges.

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Role of Collectors and Depressants in Mineral Flotation: A ...

2017-11-22  Flotation is a type of interfacial separation technique that is based on the difference in the surface ... The rising air bubbles carry hydrophobic particles to form a froth layer, which is then conveyed to the ... so-called collectors and depressants are used to regulate and control the water contact angle

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1 Froth Flotation – Fundamental Principles

2009-8-27  Froth flotation is a good example of an engineering “system”, in that the various important parameters are highly inter-related, as shown in Figure 1. It is therefore important to take all of Chemistry Components Collectors Frothers Activators Depressants pH Equipment Components Cell Design Agitation Air Flow Cell Bank Configuration

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Froth flotation process and its application

Flotation, surfactants, collectors, activators, depressants, metallurgy. 1. INTRODUCTION Froth flotation is a widely used metallurgical technique which is used in different fields like mineral processing, waste water treatments etc. During early 20th century this revolutionary

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Recent progress on research of molybdenite flotation: A ...

Depressants for molybdenite flotation. Copper sulfides, such as chalcopyrite and bornite, are hydrophilic before treatment and therefore can be easily separated from molybdenite using froth flotation. However, most processing plants recover chalcopyrite and molybdenite together in the rougher circuit.

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Measurement of froth zone and collection zone recoveries ...

2019-7-1  This paper reports the measured froth zone (R f) and collection zone (R c) recoveries in the flotation of pure quartz, pure hematite, and a quartz-hematite mixture with one of three corn starches with different mass ratios of amylose to amylopectin: waxy starch (0:100), normal starch (27:73), and Gelose 50 (50:50).The flotation tests were carried out at continuous mode using a three-product ...

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[SOLVED] Role of depressants in froth floatation method In ...

Depressants prevent certain type of particles from forming froth during froth floatation process. A common depressant used in the froth floatation of lead sulphide is sodium cyanide. When the ore containing ZnS and PbS is subjected to froth floatation process in the presence of NaCN, then only PbS forms the froth.

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What is the role of depressant in froth ... - SaralStudy

In the froth floatation process, the role of the depressants is to separate two sulphide ores by selectively preventing one ore from forming froth. For example, to separate two sulphide ores (ZnS and Pbs), NaCN is used as a depressant which selectively allows PbS to come with froth, but prevents ZnS from coming to froth.

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The effect of frother type and dosage on flotation ...

The flotation froth structure and motion determine the amount of entrained gangue that is collected to the concentrate. ... Depressants are added to flotation circuits to reduce naturally ...

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Trithiocarbonates as depressants in ore flotation ...

In another aspect of the invention it relates to the use of flotation agents and flotation depressants in the recovery of minerals from their ores. Froth flotation is a process for concentrating minerals from ores. In a froth flotation process, the ore is crushed and wet ground to obtain a pulp. Additives such as collecting or mineral flotation ...

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Ash Depression in Fine Coal Flotation Using a Novel ...

2016-11-30  mineral dispersants and polymeric depressants improved the overall coal flotation re- covery and ash reduction by rejecting partially locked or coal-free gangue that were ac- cidentally trapped in the froth

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Flotation Behavior of Complex Sulfide Ores in the

2021-8-19  Flotation Behavior of Complex Sulfide Ores in the Presence of ... set, no depressants were used and the ore was floated in ... After flotation, both the froth products (concentrates) and tailings were collected, dried, weighed, and assayed for Cu, Pb, Zn, and Fe contents. The elemental analysis

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Selective Aggregation of Hydrophilic Gangue Minerals in ...

In a highly dispersed flotation pulp, ultrafine hydrophilic minerals can entrain into froth products even though they may be perfectly hydrophilic. Therefore, effective depression of the hydrophilic minerals in froth flotation relies not only on rendering the minerals hydrophilic, but also on proper particle size control. In this paper, it will be shown that several depressants in mineral ...

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Role of Collectors and Depressants in Mineral Flotation: A ...

A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the

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Pyrite depressants useful in the separation of pyrite from ...

Froth is collected in two portions, the first for 30 seconds after the start of flotation and the second for the next 3.5 minutes. The froth concentrates and the non-floated material, the tailings, are oven dried overnight at 110° C. They are then weighed and samples are taken for analysis.

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(PDF) Depressants in scheelite flotation - Mechanism of ...

Thus, different depressants were tested in the flotation of scheelite using a commercial mixture of fatty acids. The effect of adding metallic salts [FeSO 4 , Al(NO 3 ) 3 , and Zn(SO 4 )] prior to ...

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