a review of the effect of water quality on flotationa review of the effect of water quality on ﬂotation wenying liu⇑, c.j. moran, sue vink centre for water in the minerals industry, sustainable minerals institute, the university of queensland, brisbane, queensland 4072, australia cyanide chemistry and its effect on mineral flotation the oxidation of ethy
a review of the effect of water quality on flotationa review of the effect of water quality on ﬂotation wenying liu, c.j. moran, sue vink centre for water in the minerals industry, sustainable minerals institute, the university of queensland, brisbane, queensland 4072, australia cyanide chemistry and its effect on mineral flotation the oxidation of ethyl xanthate on pyrite electrodes, and the influence of the flotation depressants hydroxide, cyanide, and sulphide, have been investigated using cyclic voltammetry. effect of cyanide in dissolution of goldof glycine where the solution is cyanide starved. the effect of glycine addition on gold leaching kinetics in coppercyanide solutions under different leaching conditions was studied. the results show that, in the presence of glycine, gold dissolution rate increases signicantly in solutions containing coppercyanide species at a very. get price cyanide control in the metallurgical process of gold cyanide control in the metallurgical process of gold extraction in anglogold (s.a.) influence of oxygen whilst cyanide is one of the major drivers if not the major driver of gold dissolution, it cannot be viewed in isolation particularly in respect to the relationship between cyanide and oxygen derived from elsners equation:  cyanide management by sartthe cyanide from the cil tailings. it also has the heap leach operation to cope with a positive water balance, cyanide and copper are both recovered and the copper sulfide produced from the sart plant could be sold with the copper sulfide concentrate produced from the flotation plant. the effect of weak acid dissociable cyanide on gold and this is a case at the hidden valley (hv) mine. in this study, the effect of free and wad cyanides on gold and silver recoveries by flotation from the hv mine was considered. wad cyanide (wad cn) was prepared by mixing sodium cyanide and copper sulfate at a cyanide to copper ratio of 3:1 dosed at different cyanide concentrations. use of cyanide in mineral processingcyanide chemistry and its effect on mineral flotation sciencedirect. cyanide has been widely used as a depressant in sulphide mineral flotation. . in fact, mineral separations by the use of cyanide are practically not easy and. contact us cyanide hazards to plants and animals from gold mining and related . lecture 6 6flotation is achieved in spite of the increased collector adsorption by the peculiar structure of the collectorstarch clathrates formed with a hydrophilic exterior. cyanides are well-known deactivators used for copper and other metal ions. the cyanide ions prevent the adsorption of th e collectors onto the metallic sites. the influence of cyanide salts and ferrous sulphate on pyrite the influence of cyanide salts and ferrous sulphate on pyrite flotation 611. ores flotation. cyanides indirectly achieve a depressing effect on pyrite, pyrrhotite and arsenopyrite, which are regularly present in these ores, especially pyrite. the influence of water quality on the flotation sphalerite flotation is not simple. cyanide additions to water were very efficient in preventing the adsorption of copper, but not lead, on sphalerite. an absorbent such as natural hydroxyapatite reduced the adsorption of lead, but not copper, on sphalerite and also reduced the flotation of the sphalerite in the presence of lead cations, but only at
a review of the effect of water quality on flotation2008; stapelfeldt and lima, 2001). copper cyanide complexes are often found in water for galenasphalerite ﬂotation because of the addition of sodium cyanide in the milling circuit (seke and pistorius, 2006). similar to ore dissolution, ﬂotation reagents themselves may contribute a small portion of water constituents (slatter et al., how temperature affects copper sulphate cyanide adsorption a study has been made of the influence of temperature on adsorption of xanthate at surfaces of galena, pyrite, arsenopyrite, chalcopyrite and sphalerite, and on the effects of alkali, cyanide and copper sulphate in hindering or promoting the adsorption. cyanide management by sartcurrently, the oxide gold ore is treated in a conventional cil circuit by blending the low and high grade copper ores to minimize cyanide consumption and allow smooth operation. the sulfide ore is treated through a flotation circuit to produce pyrite and copper concentrates. the pyrite concentrate is treated in the cil. cyanide elimination from lead-zinc flotationbioavailability of iron and cyanide from 59fe adsorb caesium or thallium selectively even in so dium or potassium rich milieu [1-2], the efficacy of hexacyanoferrate(ii) compounds as scavenging agents for depression of pyrite mineral with cyanide and ferrous/ferric greatest depressing effect on the pyrite, while the complex cyanide salts showed much less depressing effect on mineral. key words: pyrite, depression, cyanides, iron salts 1. introduction in industrial practice of flotation of sulphide lead-zinc and copper ores, pyrite, the influence of cyanide salts and ferrous sulphate on pyrite flotation test results have shown that nacn, and even more the combination of reagents feso4/nacn are more successful in pyrite depression than complex cyanide salts, such as k3fe(cn)6 and k4fe(cn)6. effect of cyanide in dissolution of goldanodic dissolution of gold in cyanide solutions effect of . tials, the temperature dependence of the gold dissolution rate reects the temperature effect on competitive adsorption of cyanide and hydroxide ions, the surface development during electrolysis, and the accumulation of the cyanide ion decomposition products and their passivating action. the influence of cyanide salts and ferrous sulphate on pyrite in the presence of tested reagents in the flotation system, iron cyanide compounds and hydrated iron oxides were formed on pyrite surface. the composition of formed compounds depends not only on cyanide ions in the solution, but also on the ph of the system and solution species. alternatives for sodium cyanide for flotation control &er& united states environmental protection agency industrial environmental research laboratory cincinnati oh 45268 research and development epa-600/s2-81-157 oct. 1981 project summary alternatives for sodium cyanide for flotation control e. j. mezey, d. w. neuendorf, g. ray smithson, jr., and james f. shea cyanide has long been looked upon as the classical poison and has been listed by epa as cyanide leaching of goldgold cyanide solution (leaching gold with cyanide) since the 1890's, cyanide has been used to recover gold from gold bearing ores. and today, over 115 years later, most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal.
the influence of cyanide salts and ferrous sulphate on pyrite in the presence of tested reagents in the flotation system, iron cyanide compounds and hydrated iron oxides were formed on pyrite surface. the composition of formed compounds depends not only on cyanide ions in the solution, but also on the ph of the system and solution species. the influence of cyanide on pyrite flotation from however, the decrease of the mixed potential does not adequately explain the depression of pyrite flotation, which is the result of the influence of cyanide on the surface electrochemical reactions. the impedance measurements showed higher impedance values in the low frequency region due to the inhibition of surface electrochemical reactions by cyanide. chapter 7. depression of sphalerite with cyanide and zinc chapter 7. depression of sphalerite with cyanide and zinc sulphate 105 flotation ph at rosh pinah therefore, the presence of hydrophilic zinc hydroxide at the surface of sphalerite will prevent the interaction between the lead-activated sphalerite and xanthate, and subsequently decrease its floatability in the lead flotation circuit. figure 7.1. chemistry of pyrite depression in flotationthe influence of cyanide salts and ferrous 2016517&ensp·&enspflotation of pyrite in the absence of the collector and in the presence of the collector. as shown in fig.1 (curves 1 and 2), pyrite lacks natural flotation, because the mineral is not floating in neutral or basic solution without the presence of xanthate, cyanide chemistry and its effect on mineral flotation cyanide has been widely used as a depressant in sulphide mineral flotation. it occasionally activates mineral flotation as well. in addition, cyanide species in the water from gold cyanidation process may be recycled to flotation circuits and have an inadvertent effect on mineral flotation. the influence of cyanide on the flotation of pyrite from influence of cyanide on flotation of pyrite 1335 in fact, electrochemical impedance measurements and linear voltammetry showed that cyanide acts as an inhibitor of all elec, trochemical reactions on the pyrite surface, including xanthate oxidation, pyrite oxidation, and oxygen reduction . depressants and dispersantsdepressants and dispersants in mineral flotation the challenge is to maximize the recovery of desired minerals while rejecting unwanted gangue components. depressants are required to give a low affinity to active sites on valuable mineral surfaces and a high affinity for gangue minerals and some sulfides. sodium cyanide in flotation of copperyes, cyanide is used as a depressant for pyrite in copper flotation. there are however a number of alternatives such as sodium meta-bisulphite (smbs) or a combination of lime nacn or lime smbs, soda ash and naoh (all ph modifiers together with nacn or smbs). influence of flotation cell volume and solids mass on the paper presents studies on the influence of flotation cell capacity and mass of solids in the suspension on the flotation kinetics of sulfide copper ore. a sample of copper ore that was collected from the polkowice mine of kghm polska miedz s.a. in poland was used in the experiments. cyanide consumption in gold miningthe consumption of cyanide during processing operations is a major economic cost in the extraction of gold from its ores, while the discharge of cyanide wastes may result in significant environmental pollution. many factors influence the levels of consumption and discharge of cyanide, including ore mineralogy and lixiviant solution chemistry.