depressants in froth flotation

Flotation Depressants - Mineral Processing Metallurgy

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 will begin to reflect more of the wanted mineral’s color. This is because the froth

More

What is the role of depressant in froth floatation process?

Feb 19, 2019  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.

More

Flotation Conditioners -Modifiers -Activators -Depressants

This branch of chemicals will prepare the mineral surface so other reagents will be able to collect the metal. For Conditioners and Modifiers, it may be simply cleaning the surface of the particles, as in the case of removing oxidization, or it may be a chemical that these are the chemicals that bind the mineral to the air bubble to be lifted away from the waste. Activators will attach itself ...

More

What is the role of depressant in froth floatation process ...

Sep 24, 2019  Question From - NCERT Chemistry Class 12 Chapter 06 Question – 006 GENERAL PRINCIPLES AND PROCESSESS OF ISOLATION OF ELEMENTS CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT:-

More

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

More

Froth Flotation Process - Detailed Explanation With ...

Froth Floatation Column. ... Depressants can be classified into two categories. Inorganic depressants such as Sodium cyanide, Zinc sulphate etc. Organic depressants such as Starch, tannin, Quebracho, Dextrin etc. pH Modifiers. pH is also a very important factor in the process of floatation. Even a slight change in the pH of the slurry can ...

More

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

More

What is the role of depressant in froth floatation process ...

Sep 24, 2019  Question From - NCERT Chemistry Class 12 Chapter 06 Question – 006 GENERAL PRINCIPLES AND PROCESSESS OF ISOLATION OF ELEMENTS CBSE, RBSE, UP, MP, BIHAR BOARD QUESTION TEXT:-

More

Depramin CMC Cellulose ethers – Nouryon

Depramin® are polymeric depressants for mineral froth flotation. Depramin® are specifically engineered to counter the contaminating effects of naturally floating gangue minerals. Depramin® enhance the recovery of valuable minerals. Froth flotation is the most important method for separating valuable minerals from waste materials in ore ...

More

Minerals Free Full-Text Effect of Depressants and ...

Froth flotation was conducted in a standard 3 L stainless steel cell using a Denver D-12 flotation machine. The slurry was conditioned at 60 wt % solids. Tap water was added to bring the slurry solids fraction to 35 wt % for flotation. During conditioning and flotation, the slurry temperature was controlled using an electrical water heater.

More

WO2014055502A1 - Depressants for mineral ore flotation ...

Depressants comprising one or more types of polysaccharides comprising one or more types of pentosan units are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more collecting agents and one or more of the depressants.

More

Depressants Solvay

Depressants make it possible to increase final recovery consistently without sacrificing concentrate grade. They can either depress the effect of hydrophobic gangue minerals in the ore that would otherwise report with the froth along with the desired mineral, or hold down the desired mineral while floating the undesirable gangue.

More

Use of depressants in the direct flotation of a silicate ...

1. Introduction. Flotation is the most common concentration process used by the mineral industry, both in quantity of ores processed and in diversity of applications (Peres et al, 2007).At present, over 2 x 10 9 t per year of ore is estimated to be processed through flotation. In Brazil, this technique played an important role in the growth of the mineral sector, especially in the industry of ...

More

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.

More

1 Froth Flotation – Fundamental Principles

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

More

(PDF) Effect of different depressants on galena flotation

Selective sulphide concentrates with low arsenic content were tried to be produced by froth flotation. Individual concentrates of Pb, Zn and Cu assayed 67.54% Pb, and 61.49% Zn and 23.31% Cu where ...

More

Handbook of Flotation Reagents ScienceDirect

Modern classification of flotation reagents is based on the function of a particular reagent. On this basis, reagents are divided into collectors, frothers, regulators, and depressants. Collectors are a fairly large group of organic chemical compounds, which differ in chemical composition and function.

More

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

More

Froth Flotation Process - Detailed Explanation With ...

Froth Floatation Column. ... Depressants can be classified into two categories. Inorganic depressants such as Sodium cyanide, Zinc sulphate etc. Organic depressants such as Starch, tannin, Quebracho, Dextrin etc. pH Modifiers. pH is also a very important factor in the process of floatation. Even a slight change in the pH of the slurry can ...

More

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

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

More

What is the role of depressants in the froth floatation ...

Depressants are used to prevent certain type of particles from forming the froth with the bubbles. Example : In case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.

More

Minerals Free Full-Text Effect of Depressants and ...

Froth flotation was conducted in a standard 3 L stainless steel cell using a Denver D-12 flotation machine. The slurry was conditioned at 60 wt % solids. Tap water was added to bring the slurry solids fraction to 35 wt % for flotation. During conditioning and flotation, the slurry temperature was controlled using an electrical water heater.

More

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.

More

(PDF) Effect of different depressants on galena flotation

Selective sulphide concentrates with low arsenic content were tried to be produced by froth flotation. Individual concentrates of Pb, Zn and Cu assayed 67.54% Pb, and 61.49% Zn and 23.31% Cu where ...

More

ZINC DEPRESSION IN THE GALENA FLOTATION OF ERMA REKA ...

In our previous work (Ranchev et al., 2016) the effect of both depressants ZnSO4 and MINFIT ® (modified sulfite complex) addition during the laboratory flotation experiments have been studied. It ...

More

Froth flotation - Wikipedia

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic.This is used in mineral processing, paper recycling and waste-water treatment industries. Historically this was first used in the mining industry, where it was one of the great enabling technologies of the 20th century.

More

Important Questions for Class 12 Chemistry Chapter 6 ...

Dec 06, 2019  What is the role of depressants in the froth floatation process of dressing of ores? (Comptt. Delhi 2012) Answer: Depressants are used to prevent certain type of particles from forming the froth with the bubbles. Example : In case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth ...

More

What are the three major froth flotation reagents? - Quora

At present, the commonly used beneficiation processes include gravity separation, magnetic separation, flotation and so on. The chemical beneficiation process such as flotation process is more complicated than the physical beneficiation process su...

More

as - Columbia University

Inorganic electrolytes are often used as depressants and activators in the froth flotation of minerals. Even though some research has been done on the froth flota-tion of minerals in the presence of inorganic salts, a model capable of satisfactorily explaining or predicting

More

What is Froth Flotation?

Dec 17, 2020  Froth flotation is a process using air bubbles to separate materials based on their relative affinity to water. Bubbles carry reagent and hydrophobic materials to the top of a tank where they can be removed. Froth flotation has been used for more than a century in mining operations to separate valuable materials from excavated ores.

More

Organic Depressants A large number of organic compounds ...

1.5.3.3.3 Organic Depressants A large number of organic compounds are useful as flotation depressants. These tend to be soluble polymers (such as starch) that selectively coat mineral surfaces and prevent collector from attaching. An example of this is in the “reverse flotation” of silica from iron ore, where the silica tailings are floated using a cationic collector at a pH of 8.5 - 11 ...

More

Froth Flotation Process - Detailed Explanation With ...

Froth Floatation Column. ... Depressants can be classified into two categories. Inorganic depressants such as Sodium cyanide, Zinc sulphate etc. Organic depressants such as Starch, tannin, Quebracho, Dextrin etc. pH Modifiers. pH is also a very important factor in the process of floatation. Even a slight change in the pH of the slurry can ...

More

What is the role of depressants in the froth floatation ...

Depressants are used to prevent certain type of particles from forming the froth with the bubbles. Example : In case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.

More

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

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

More

"Enhanced phosphate flotation using novel depressants" by ...

Froth flotation is the most efficient method for phosphate separation, which is a physic-chemical separation process based on the difference of surface properties between the valuable minerals and unwanted gangue minerals. However, the presence of clay slimes in the slurry after grinding consumes a large amount of reagents, decreases the collision probability between bubbles and minerals ...

More

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 ...

More

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

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

More

as - Columbia University

Inorganic electrolytes are often used as depressants and activators in the froth flotation of minerals. Even though some research has been done on the froth flota-tion of minerals in the presence of inorganic salts, a model capable of satisfactorily explaining or predicting

More

CHAPTER 3 COMPARISON OF DIFFERENT PYRRHOTITE

The purpose of this research is to investigate the depression effect of two polymeric depressants (S-7260 and S-7261) developed by Cytec Industries by conventional flotation technique, and the possibility of replacing DETA with cheaper polymer depressants in pentlandite pyrrhotite flotation separation. 3.3 EXPERIMENTAL 3.3.1 Mineral Samples

More

Frothers Froth Flotation ArrMaz

During the flotation process, frothers help create the ideal hydrodynamic conditions (such as bubble size and gas holdup) required within the pulp in the flotation cell. They generate froth that is stable enough to hold collected minerals on top of the pulp, mobile enough for removal, and decays quickly to assist with downstream operations.

More

Important Questions for Class 12 Chemistry Chapter 6 ...

Dec 06, 2019  What is the role of depressants in the froth floatation process of dressing of ores? (Comptt. Delhi 2012) Answer: Depressants are used to prevent certain type of particles from forming the froth with the bubbles. Example : In case of an ore containing ZnS and PbS, the depressant used is NaCN. It selectively prevents ZnS from coming to the froth ...

More

The interactive effect of depressant type and dosage with ...

Since it is known that water recovery is closely related to froth stability it was used to infer froth stability in this study. Two types of depressants carboxymethyl cellulose (CMC) and guar gums which are usually used in the flotation of PGE bearing ores were used. The frother was Dow 250.

More

University of Kentucky UKnowledge

DEPRESSANTS . Froth flotation is the most efficient method for phosphate separation, which is a physic-chemical separation process based on the difference of surface properties between the valuable minerals and unwanted gangue minerals. However, the presence of clay slimes in the slurry after grinding consumes a large amount of reagents ...

More

Choose the correct statement(s) for froth flotation ...

In some sulphide ores of copper, zinc and lead, the concentration is brought by froth flotation process.In this method, the advantage is taken of the preferential wetting of the ore by an oil. The finely ground ore is taken in a tank containing water and 1% of pine oil or turpentine oil. Collectors (e. g., pine oils, fatty acids, xanthates, etc.) enhance non-wettability of the mineral ...

More

The Effect of Collectors and Their Interactions with ...

This study included microflotation (ie frothless flotation) and batch flotation of various ores using a number of different collectors and depressants and a newly developed froth imaging device (Smartfroth TM). Flotation performance was characterised by mass and

More