role of depressants during conc of sulfide ores

Mineral processing

Depressants and activators are used to selectively separate one mineral from another. Depressants inhibit the flotation of one mineral or minerals while activators enable the flotation of others. Examples of these include CN , used to depress all sulfides but galena and this depressant is believed to operate by changing the solubility of

PDF A Review of the Flotation of Copper Minerals

role in selection of reagent scheme for the benefi ciation of the ore. These ores also contain cobalt These ores also contain cobalt minerals, mainly carrolite Co 2 CuS 4 and cobaltite CoAsS.

Froth flotation

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.

Froth floatation process is used for the concentration of

Froth floatation process is used for the concentration of sulphide ores. This process is an illustration of the practical application of: It has been described as the single most important operation used for the recovery and upgrading of sulfide ores. Which of the following statements is correct about the role of collectors added during

Selective separation of galena and sphalerite from pyrite

depressant . However, sodium cyanide consumption has been forbidden in the Kooshk plants due to environmental concerns. Consequently, selective separation of lead zinc sulfide minerals from pyrite requires appropriate selective depressant and collectors. Different reagents are usually applied in the selective separation and

Characterization and Flotation of Sulfur from Chalcopyrite

Mineral processing played only a small role in the elemental sulfur industry. When a sulfur ore was selected, a typical method was grinding the sulfur ore to about 28 mesh followed by froth flotation. Flotation concentrates were melted and filtered to produce sulfur products with a grade of 99.5 . These plants basically operated before 1960s .

Zinc processing Britannica

Zinc processing, the extraction of zinc from its ores and the preparation of zinc metal orpounds for use in various products.. Zinc Zn is a metallic element of hexagonal close packed hcp crystal structure and a density of 7.13 grams per cubic centimetre. It has only moderate hardness and can be made ductile and easily worked at temperatures slightly above the ambient.

Characterization and Flotation of Sulfur from Chalcopyrite

Mineral processing played only a small role in the elemental sulfur industry. When a sulfur ore was selected, a typical method was grinding the sulfur ore to about 28 mesh followed by froth flotation. Flotation concentrates were melted and filtered to produce sulfur products with a grade of 99.5 . These plants basically operated before 1960s .

Flotation of Copper Sulfide Ores PDF Free Download

Themon depressants used in the treatment of massive sulfide ores, such as lime and cyanide, are not effective on finely disseminated massive sulfide ores. Lime is used as co depressant with another auxiliary depressant. In operating plants,

Gold processing Britannica

Gold processing, preparation of the ore for use in various products.. For thousands of years the word gold has connoted something of beauty or value. These images are derived from two properties of gold, its colour and its chemical stability.The colour of gold is due to the electronic structure of the gold atom, which absorbsic radiation with wavelengths less than 5600 angstroms

Magmatic Ore Deposits Sede Medellin

Magmatic Ore Deposits Magmatic ore deposits are those which are formed during crystallization of a magma, deep underground. The host rock for the mineralization can range from ultramafic to felsic. The deposit can consist of massive ores in some cases, a nd disseminations of rare minerals in others.

Gold extraction

Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of small gold nuggets and flakes. Placer mining techniques since the mid to late 20th century have generally only been the practice of artisan miners. Hydraulic mining was used widely in the Californian gold rush, and involved

Froth flotation

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.

Role of degassing of the Norilsk nickel deposits in the

Mar 07, 2017· The Norilsk deposits represent one of the most valuable metal concentrations on Earth and are associated with the worlds largest outpouring of mafic magma. Mass release of nickel into the atmosphere during ore formation has been postulated as one of the triggers for the PermianTriassic Mass Extinction Event, by promoting the activity of the marine Archaea methanosarcina with

EFFECT OF SEAWATER MAIN COMPONENTS ON

carried out during rougher flotation of Cu Mo sulfide ores Castro et al., 2012b revealed that in the presence of polyglycol frothers DF 250 and DF 1012 the frothability was much lower when measured in seawaterpared with that in fresh water. To sum it up, the available evidence indicates that while depression of molybdenite

The leaching and adsorption behaviour of gold ores

important as simple free milling oxide ores are depleted. During cyanidation and adsorption onto activated carbon, these effectspeting metalplexes, preg robbing and the mineralogy of the ore. This thesis considers these areas from an experimental and modelling viewpoint.

CA1338110C Polymeric sulfide mineral depressants

A method for the benefication of value sulfide minerals from sulfide ores with selective separation of sulfide mineralsprises: a providing an aqueous pulp slurry of finely divided, liberated ore particles b conditioning said pulp slurry with an effective amount of a synthetic depressant, a sulfide mineral collector and a frothing agent, respectively, saidprising a

1 Froth Flotation Fundamental Principles

the ore is not weighed and only assays will be available. However, it is possible to express the ratio of concentration in terms of ore assays. Starting with the mass balance equations, and the definition of the ratio of concentration: F = C + T, Ff = Cc + Tt, Ratio of Concentration = F/C

FROTH FLOTATION : RECENT TRENDS Flotation of Sulphide

As regards other reagents used in sulphide flotation, depressants like sodium cyanide, ZnSO4, sodium meta bi sulphitemon. Effectiveness of depressant also depends on concentration and selection of collectors. In case of cyanide as iron sulphide depressant there is a relationship between concentration of collector and cyanide ion present.

FROTH FLOTATION : RECENT TRENDS Flotation of Sulphide

As regards other reagents used in sulphide flotation, depressants like sodium cyanide, ZnSO4, sodium meta bi sulphitemon. Effectiveness of depressant also depends on concentration and selection of collectors. In case of cyanide as iron sulphide depressant there is a relationship between concentration of collector and cyanide ion present.

Mineral processing

Depressants and activators are used to selectively separate one mineral from another. Depressants inhibit the flotation of one mineral or minerals while activators enable the flotation of others. Examples of these include CN , used to depress all sulfides but galena and this depressant is believed to operate by changing the solubility of

EXTRACTING METALS FROM SULFIDE ORES

The need for a new process to treat Broken Hill ore arose from the depletion of the secondary oxide ore that overlay the major sulfide mineralization. Natural oxidation to form the secondary zone had resulted in a concentration of silver and lead, and ore from this section of the ore body could be smelted directly.

The fundamental roles of monovalent and divalent cations

1. Introduction Mineral flotation is a water intensive process consuming vast amounts of freshwater every year. 1 The scarcity of freshwater in some arid areas e.g., Mt Keith and Leinster Mines in Western Australia, Grasberg Mine in Indonesia, Xstrata Nickel Raglan Mine in Canada, Las Luces Mine in Chile coupled with economic and environmental concerns has prompted alternatives to freshwater

Flotation Behaviorplex Sulfide Ores in the Presence

In this research, flotation of copper, lead and zinc minerals from a copper oxidesulfide ore was studied. The identification tests showed that the sample is a mixture of quartz, chalcopyrite, galena, cerussite, hemimorphite and iron oxide minerals with 5.04 CuO, 1.61 PbO, 2.07 ZnO and 56.40 SiO2. The experimental design methodology RSM was conducted to investigate the effect of

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

The Critical Role of Pulp Density on Flotation Separation

within 3 min. During the flotation, the concentration was collected after cumulative times of 2, 4, 6, 8, and 10 min. To investigate how the flotation was affected by the pulp density of a single mineral and the mixture of sulfide and serpentine, sulfide and serpentine slurries 5 40 wt of the total solid by

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

CA1338110C Polymeric sulfide mineral depressants

A method for the benefication of value sulfide minerals from sulfide ores with selective separation of sulfide mineralsprises: a providing an aqueous pulp slurry of finely divided, liberated ore particles b conditioning said pulp slurry with an effective amount of a synthetic depressant, a sulfide mineral collector and a frothing agent, respectively, saidprising a

PDF FORMATION OF H2O2 BY METAL SULFIDES AND ITS EFFECT

The a ddition of depressants during sulfide ore grin ding decreases the formation of H 2 O 2 in pulp liquid and the flotation results are not promising. However, better flotation results are

Recycle of Wastewater from Lead Zinc Sulfide Ore Flo

Lead zinc sulphide ore contains lead sulphide galena, and zinc sulphide sphalerite. In the first flotation stage, galena is rendered hydrophobic withanic collector such as xanthate, while sphalerite is kept from floating by depressants, and in the second flotation stage, activator was used to activated zinc flotation. Sinceanic regent used are different in the two flotation

The Importance of pH in Flotation

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

The role of halogens with sulfide melting at Broken Hill

This study reports the discovery of a suite of primary lead bromine substituted chlorides and bromine iodine substituted oxy hydroxychlorides which have subsequently exsolved from a sulfogen melt. The implications are that halogens have substituted into sulfide ores at peak metamorphic conditions, during partial melting and exsolved.They provide a direct view of the chemical evolution of the

Role of sodium sulfide in the flotation of oxidized copper

This paper reviews uses of sodium sulfide in the flotation of oxide minerals of copper, lead, and zinc. The activation and depression effects of sodium sulfide are of particular importance because of their applications with oxidized lead and copper ores. In spite of its industrial importance, the nature of the heterogeneous reactions between sulfide ions in solution and the surface of oxidized

Reexamining the functions of zinc sulfate as a selective

Sep 15, 2006· Zinc sulfate is a well known selective depressant for zinc sulfide minerals such as sphalerite during the flotationplex Cu Pb Zn sulfide ores. It deactivates sphalerite flotation by substituting the activating metal ions, and depresses sphalerite flotation by forming hydrophilic coatings of zinc hydroxyl species on sphalerite surfaces.

Role of degassing of the Noril sk nickel deposits in the

mosphere during eruption of the SLIP lavas. Here we use 2D and 3D X ray imagery on Norilsk nickel sulfide, combined with simple ther modynamic models, to show that the Norilsk ores were degassing while they were forming. Consequent bubble riding by sulfide droplets, followed by degassing of the shallow, sulfide saturated,

The depression of pyrite in selective flotation by

Oct 01, 2016· Overall, the action of pyrite depressants is either to desorb the collector or activator from pyrite surface, deactivate the activating ions, prevent collector adsorption on pyrite, or make the pyrite surface hydrophilic.

Role of degassing of the Norilsk nickel deposits in the

Mar 07, 2017· The Norilsk deposits represent one of the most valuable metal concentrations on Earth and are associated with the worlds largest outpouring of mafic magma. Mass release of nickel into the atmosphere during ore formation has been postulated as one of the triggers for the PermianTriassic Mass Extinction Event, by promoting the activity of the marine Archaea methanosarcina with

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