Two-liquid flotation of sulphides: An electrochemical approach

Kocabağ, Duran; Güler, Taki

doi:10.1016/j.mineng.2007.05.005

Cited by 31 publications

(7 citation statements)

References 26 publications

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“…The depression of pyrite flotation by cyanide has always been observed to be associated with the decrease of redox potential on pyrite surface in alkaline solution 18, 19. In the present study, there was a decrease of open circuit potential (OCP) for pyrite electrode with the addition of cyanide.…”

Section: Resultssupporting

confidence: 48%

“…Cyanide consistently exists as HCN when pH is lower than 7 16. Though numerous studies of this system were carried out, the depression mechanism of cyanide has been controversial and was postulated to be associated with the formation of iron‐cyanide compounds on pyrite surface 17, 18 or the inhibition of xanthate oxidation at reducing potential in the presence of cyanide 13, 19. Furthermore, those studies involving cyanide‐pyrite interaction were conducted at neutral to alkaline pH.…”

Section: Introductionmentioning

confidence: 99%

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The Poisoning of Pyrite Surface upon Xanthate Adsorption by Cyanide in Mildly Acidic Media

Guo

2015

Electroanalysis

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[a] 1Introduction Thea dsorption of organic species ontom inerala tt he solid-liquid interface is of significance for the establishmento fh ydrophobics urface,r enderingm inerals flotation possible.I ti sn ow well established thatt he interaction of typicalc ollector xanthate withp yrite, the most abundant sulfide minerals is electrochemicali nn ature [ 1].T he pyrite-xanthatei nteraction is affected by manyf actors sucha spH, redox potential,a nd differents olution species, in addition to the history of the mineral. It was reported [2-4] thatt he maximum flotationr ecoveryo fp yritei so bserveda tm ildly acidicp H( 3.5-5.5),e specially withl ow xanthate concentration. Thed epression at lower pH has been attributed to the decomposition of xanthatei ons [ 4]. Thec hemisorption of xanthatep resumably involves the oxidation of xanthatet od ixanthogeno np yrite [4][5][6][7][8]. Spectroscopics tudies [ 8] showt hatt he amount of adsorbed xanthater eaches am aximuma tp H5 after treatmentw ith1 0 À4 xanthate solution andd ecreases steadily withf urtheri ncreasingp H. Theg reater extent of hydrophilic ferric hydroxidecoverage on pyritewith the increasingpHisunfavorable for the adsorptionofxanthate [4,7]. Thepoorfloatabilityinneutral media hasalsobeenattributedt ot he formation of hydrophilicf erric dihydroxyx anthate,F e(OH) 2 EX, over apHrange from5to 9 [2,3].It was also revealed that cyanide inhibited all surface electrochemical activities, rendering pyrite surface hydrophilic [9][10][11][12][13][14].C yanide speciation largelyd epends on pH of the solution. Thec yanide anion in aqueous solution forms hydrocyanic acid (HCN)a ccording to the dissociation reaction in Equation (1) [15].Thel ogarithmic exponent of the dissociation constant pKa of HCN at 25 8Cis9 .21 [16].ApH value higher than 9.21 increases CN À concentration while ap Hvalue lower than 9.21 promotes the presence of aqueous HCN in the solution.C yanide consistently exists as HCN whenp Hi s lower than 7 [ 16].T hough numerous studies of this system were carried out, the depression mechanism of cyanide has been controversial and was postulated to be associated with the formation of iron-cyanide compounds on pyrite surface [17,18] or the inhibitiono fx anthate oxidation at reducingp otential in the presenceo fc yanide [13,19].F urthermore,t hose studies involving cyanidepyrite interaction were conducted at neutralt oa lkaline pH. Thex anthate chemisorption in the presenceo fH CN in mildly acidic media is unknown, whichi s, however, of great importance whent he maximum recovery of pyrite is desired in flotation, particularly for auriferous pyritic ore.Due to the maximum xanthate chemisorptiono np yrite can be achieved at pH 5[ 8],t he impact of HCN on pyrite-xanthate interaction was investigated at pH 5b y means of electrochemical measurements. 2Experimental MethodsAh and-picked naturalm assive cubic pyrite specimen originated fromS pain was used as workinge lectrode.X -ray fluorescence (XRF) analysis shows that the pyrite specimen had as ulfurc ontento f6 ...

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Section: Resultssupporting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

The Poisoning of Pyrite Surface upon Xanthate Adsorption by Cyanide in Mildly Acidic Media

Guo

2015

Electroanalysis

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“…On the other hand, the iron–cyanide complexes were concluded to be the primary compounds that exhibited the depression effects on the flotation performance of this copper sulfide mineral, as reported by Adams . Moreover, other researchers − thought that the depression mechanisms of cyanide on the flotation of chalcopyrite were complicated, which depended critically on the flotation pulp environments such as the concentration of cyanide and pulp potential. Though lots of investigations have been conducted, the mechanism by which cyanide depresses the chalcopyrite flotation is not well understood yet.…”

Section: Introductionmentioning

confidence: 77%

Density Functional Theory and XPS Studies of the Adsorption of Cyanide on Chalcopyrite Surfaces

et al. 2020

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In this work, both the density functional theory (DFT) calculation and X-ray photoelectron spectroscopy (XPS) were conducted to investigate the depression mechanisms of cyanide on the flotation performance of chalcopyrite. The density functional theory calculation results showed that cyanide could be adsorbed on a chalcopyrite (112) surface spontaneously, which preferably occurred on the surface Fe–Fe hollow site. Both C and N atoms of cyanide could bond with Fe atoms of the chalcopyrite (112) surface, while the interaction of Fe–C bond was more intense, where the Fe 3d orbital donated electrons to the hybrid sp orbital of a C atom forming a back-donating bond. XPS analysis indicated that the chemical interaction between cyanide and surface Fe atoms occurred, resulting in the generation of a hydrophilic iron–cyanide complex on the chalcopyrite surface, which deteriorated the flotation performance of chalcopyrite.

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“…Kireç taşõnõn bilinçli olarak ilavesi ise, Roma İmparatorluğu DšnemiÕnden sonra başlamõştõr. Daha šnce Ÿretilen camlarda kireç taşõ bileşime, kullanõlan kum ve bitki kŸlŸnŸn bileşiminden geliyordu (Kocabağ, 2002). Cam yapõcõ oksitler tek başlarõna cam malzemesini oluşturabileceği gibi aynõ zamanda başka oksitlerle bileşerek de farklõ amaçlarda ve ekonomik değerlerde cam Ÿretilebilir.…”

Section: Introductionunclassified

“…Cam yapõcõ oksitler tek başlarõna cam malzemesini oluşturabileceği gibi aynõ zamanda başka oksitlerle bileşerek de farklõ amaçlarda ve ekonomik değerlerde cam Ÿretilebilir. Yani bir cam formŸlŸ hazõrlanõrken, hangi oksitten ne oranda kullanõlacağõ, nasõl bir nihai cam Ÿretileceği ile ilgilidir (Kocabağ, 2002) (Byrd, 2011). Littleton, ÒPek çok kimse, sanayileşme sŸrecinde biçimdeki duyguyu kaybetti; yaratõcõ çalõşma kõsa sŸrede değiştirildiÓ diyerek stŸdyo camcõlõğõ ve endŸstriyel cam Ÿretim sŸrecinin arasõndaki farka dikkat çekerken, aynõ zamanda stŸdyo camcõlõğõnõn gelişebilmesi için gerekli olan Òyaratõcõ çalõşma sŸreciÓnin šnemini de vurgulamõştõr (Byrd, 2011).…”

Section: Introductionunclassified

Sicak Cam Üfleme Tekni̇ği̇nde Odun Külü Kullaniminin Esteti̇k İfade Olanaklarinin Araştirilmasi

Yeşilay¹,

Akbey²

2017

AKRA Kültür Sanat Ve Edebiyat Dergisi

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Glass has passed some important phases throughout history. The development process that began with the discovery of glass in about 3500 years ago has enabled glass to spread to wider masses with the discovery of hot glass blowing. Later, the use of glassware became widespread with the development of crystal glass and the beginning of low cost glass production. The most important turning point is the movement of the studio glass, which was about 100 years ago. Glass is a material used for decorative purposes from ancient civilizations to day-to-day. Nature has spontaneously produced glassware and the natural glass called obsidian has been used in the construction of various tools since ancient times. With the development of technology, the production of glass industry has started and at the same time, with the development of studio glassware, hot glass forming has made itself a technique in glass arts. In this study, the effect of wood ash on hot glass formation was investigated in order to investigate surface effects in hot glass technique. According to the results obtained, it has been shown that wood ash, which has many advantages such as having very fine particles, high avaliability and high reactivity, can be used in hot glass technique as a eco-friendly decoration material.

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Two-liquid flotation of sulphides: An electrochemical approach

Cited by 31 publications

References 26 publications

The Poisoning of Pyrite Surface upon Xanthate Adsorption by Cyanide in Mildly Acidic Media

The Poisoning of Pyrite Surface upon Xanthate Adsorption by Cyanide in Mildly Acidic Media

Density Functional Theory and XPS Studies of the Adsorption of Cyanide on Chalcopyrite Surfaces

Sicak Cam Üfleme Tekni̇ği̇nde Odun Külü Kullaniminin Esteti̇k İfade Olanaklarinin Araştirilmasi

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