chemistry of pyrite depression in flotation

Redox conditions and chemical reactions involved in depression mechanisms of pyrite by MBS or sodium sulfite in seawater are investigated and discussed based on the acidifying effect of MBS oxidation of sulfite ions by dissolved oxygen and the role of catalyst of some metal cations (e g copper ions) adsorbed on pyrite's surface The physico-chemical behaviour of sulphides is further complicated for complex sulphides when and pyrite 2 0-ISO JAm) do not problem has received more attention in the area of non- suggest any correlation for either the maximum or flotation of the 8SOfo -44-jlm feed is in the

Introduction to Mineral Processing

The response of many minerals to the flotation process is often dramatically affected by pH Flotation circuits are often operated at a pH range of 7 5 to 11 5 The exact range at any given plant is optimized for the ore at that site Lime is often used to raise the pH of the pulp and also reduce the flotation of iron pyrite Particle Size

Its flotation can also be enhanced by the activation of copper or lead ions emanating from other minerals Depressants are generally required to selectively depress pyrite In this article a comprehensive review of the fundamental studies of depression mechanisms and effectiveness of commonly used reagent systems to depress pyrite is presented

The solution chemistry of sodium silicate and implications for pyrite flotation have been studied In addition to flotation and sedimentation tests electrophoresis inductively coupled plasma (ICP) tests and X-ray photoelectron spectroscopy (XPS) have been used The flotation and sedimentation results show that lizardite causes problems in the flotation of pyrite by adhering to the pyrite

The metallurgical aspects of fluorine in the current flotation circuit were studied in a survey conducted on 20 March 1997 The nine major streams in the flotation circuit were sampled and these were subjected to typically wet and dry mass determinations chemical assay and size by size analysis of each stream

FROTH FLOTATION RECENT TRENDS IIME JAMSHEDPUR 1998 pp 18-41 Flotation of Sulphide Ores - HZL Experience V P KOHAD Hindustan Zinc Ltd Zawar Mines Udaipur - 313 901 ABSTRACT Flotation process patented in the year 1906 was originally developed for mineral industry to recover values from high grade tailings of gravity separation plants


Pyrite Depression By Reduction Of Solution Oxidation Potential

----- ABSTRACT A study of pyrite depression by reducing agents with potassium ethylxanthate as collector indicates that pyrite may be depressed effectively in the flotation of both lead and copper sulfide ores without the use of poisonous cyanide salts

The low potential hydrophobic state of pyrite in amyl xanthate (PAX) flotation with nitrogen is of particular interest with regard to the N2TEC flotation technology currently being used for the recovery of auriferous pyrite at Newmont's Lone Tree Plant in Nevada Initially the N2TEC system had been found to operate satisfactorily but cyanide in the

The depression of pyrite by lime is attributed to the surface formation of Ca(OH) 2 CaSO 4 and Fe(OH) 3 as determined by XPS analysis Xanthate flotation tests show that oxalic acid and other organic acids as well as sulphuric acid and other inorganic acids and their salts can restore xanthate flotation of pyrite after depression by lime

selectively with depression of zinc and iron followed by reflotation of the copper-lead tailing for recovery of zinc[9] The polymetallic separation flowsheet of copper/lead bulk flotation–copper lead separation–priority floating zinc and pyrite from the bulk flotation tailings was

Therefore the overall objective of this thesis study is to investigate the effects of regrinding chemistry and particle breakage mechanisms on the cleaner flotation The implementation of regrinding in the copper and pyrite flotation circuits at Telfer gold mine was taken as a case study

The depression of pyrite by lime is attributed to the surface formation of Ca(OH) 2 CaSO 4 and Fe(OH) 3 as determined by XPS analysis Xanthate flotation tests show that oxalic acid and other organic acids as well as sulphuric acid and other inorganic acids and their salts can restore xanthate flotation of pyrite after depression by lime

Electrolytic flotation a rather unconventional flotation technique used in effluent treatment was investigated on pyrite the process was enhanced by xanthate and also a cationic collector This was then compared with classical floatability experiments

Selective depression of flotation of hematite from apatite can be achieved under conditions of moderate depression (Gong et al 1992b) and this is shown to correspond to silie solutions The effect of quartz on the flotation of pyrite depressed by serpentine

The Depression of Sphalerite during Carbon Pre

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

Chemistry of Flotation cations chalcocite chalcopyrite Chem chemisorbed chemisorption Colloid complete flotation contact angle cupric cuprous cyanide depression diethyl dithiophosphate coverage multilayers natural hydrophobicity occurs oleate oxygen pH range pH values phenomena precipitation presented in Figure pyrite pyrolusite quartz

flotation separation arsenopyrite Flotation separation Flotation is the most widely used method for the concentration of finegrained minerals It takes advantage of the different physicochemical surface properties of mineralsin particular their wettability which can be a natural property or one artificially changed by chemical reagents More Detail

The metallurgical aspects of fluorine in the current flotation circuit were studied in a survey conducted on 20 March 1997 The nine major streams in the flotation circuit were sampled and these were subjected to typically wet and dry mass determinations chemical assay and size by size analysis of each stream

11 45 Effects of frothers and the flow pattern of air supply on bubble size in a flotation column with diffused aeration Hangil Park Chun Yong Ng and Liguang Wang (The University of Queensland Australia) 12 00 Mineralogical and surface chemical characterization of flotation feed and products after wet and dry grinding M Peltoniemi R Kallio A Tanhua S Luukkanen and P Permki

Arsenopyrite is separated from a mixture with pyrite by contacting the mixture with a sulfitic agent providing HSO3- ions at elevated temperature and pH below about 8 for a period sufficient to impart a selective depression property to the arsenopyrite On addition of a collector the pyrite is rendered floatable enabling froth flotation to achieve a concentrate rich in pyrite and tailings

The more flotation collector you have on the higher you will need to increase that pH for effective pyrite depression You also need to insure your pyrite and copper minerals are well liberated for good chemical separation by pH In froth flotation depressing pyrite or any metal is impossible if

This study investigated the effects of H2O2 treatment on xanthate interaction and flotation separation of chalcopyrite a Email [email protected Selective chalcopyrite flotation from pyrite with glycerine-xanthate as depressant Lactic acid as selective depressant for flotation separation of chalcopyrite from pyrite and its depression

Modelling of pyrite depression process by lime in copper 2018-3-24 formation of calcium sulphate carbonate or hydrate as the main reason of pyrite depression by lime are in contradiction with facts of pyrite flotation in pulps saturated with respect to calcium sulphate (at Rommelsberg plant) or calcium carbonate [Abramov A A Chat Now

FROTH FLOTATION RECENT TRENDS IIME JAMSHEDPUR 1998 pp 18-41 Flotation of Sulphide Ores - HZL Experience V P KOHAD Hindustan Zinc Ltd Zawar Mines Udaipur - 313 901 ABSTRACT Flotation process patented in the year 1906 was originally developed for mineral industry to recover values from high grade tailings of gravity separation plants

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