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A review of investigations into the management of gangue in the flotation of platinum group minerals

O’Connor C., Wiese J., Corin K., McFadzean B.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 4

1107--1115

EN

The Bushveld Complex of South Africa contains almost 90% of the world’s reserves of platinum group minerals (PGMs). In the flotation of PGMs, there are significant challenges arising from the need to treat ever-decreasing grades of the relevant ore deposits. The major challenge in the flotation of these ore bodies is the control and management of the gangue minerals, particularly silicates such as orthopyroxene, plagioclase feldspar, and pyroxene which are often rimmed with talc which makes them naturally floatable. It has been shown that various polysaccharide depressants such as CMC and guar have different properties in terms of depressing the gangue minerals. Since the PGMs are often associated with sulphides, copper sulphate is widely used as an activator in PGM flotation but can inadvertently activate the gangue minerals as well as reduce the recovery of PtTe2 which accounts for up to 40% of the Pt in the Platreef ore body. Depressants also reduce the mass of solids reporting to the froth and can thus destabilize the froth. This effect on the froth can be mitigated by using higher frother dosages or water of higher ionic strength. In summary due care needs to be taken to carry out site test work to develop an optimum ratio of collector, frother, activator and depressant to ensure that the highest grades and recoveries of the PGEs are obtained while reducing depressant dosage as much as possible. Chromite recoveries can be reduced through the application of gravity separation or reducing entrainment through reduced water recovery.

2

Spektrofotometryczna analiza kwaśnych roztworów siarczanu(VI) miedzi(II)

Wojnicki M., Rudnik E., Szablowska M., Partyka J.

Przemysł Chemiczny

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2015

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T. 94, nr 10

1692-1696

PL

Przeprowadzono badania spektrofotometryczne w zakresie UV-Vis kwaśnych roztworów siarczanu miedzi. Roztwory absorbują światło w dwóch zakresach spektralnych: 190–330 nm i 570–1100 nm. W pierwszym przedziale absorpcja światła jest determinowana przez obecność kompleksu CuSO4 i jonów SO4 2- . W zakresie światła widzialnego absorbancja jest prostoliniową funkcją całkowitego stężenia soli i temperatury, lecz wykazuje minimum przy wzroście stężenia H2SO4. Efekt ten powiązano z obecnością form równowagowych akwakompleksu i kationowego kompleksu wodorosiarczanowego Cu(II) w roztworze.

EN

Acidic solns. of CuSO4 were studied by spectrophotometry in UV and visible light regions to det. the effects of Cu(II) and H2 SO4 concns. and temp. on the absorption spectra and soln. absorbance. Cu occurred mostly as Cu2+ and CuHSO4+ ions.

3

Development and validation of spectrophotometric methods for the quantification of solifenacin succinate: application to tablet dosage forms

Seshamamba B. S. V., Satyanarayana P. V. V., Sekaran Ch. B.

International Letters of Chemistry, Physics and Astronomy

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2013

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Vol. 10, iss. 2

167-182

EN

Four sensitive, precise and accurate spectrophotometric methods for the estimationof solifenacin succinate(SFS) have been developed. Method Adescribes the interaction of SFSwith potassium permanganate in alkaline mediumto give green colored manganate ionwith absorption maxima at 610nm. Methods Band Care based on the formation of ternary complexes of SFSwith, copper (II)/eosin(method B)and ammonium molybdate/ammonium thiocyanate(method C),respectivelywhich are extracted into chloroform and have absorption maxima at 545nm (method B) and 465nm (method C). Method D was based on the formation of yellowcolored ion-pair complex between bromocresol green and SFS in dichloromethane medium with absorption maxima at 415nm.Regression analysis of Beer's law plot showed good correlation in the concentration range of 5-50, 2.5-50, 10-100 and 2-20 μg/mLfor methods A, B, Cand D, respectively. Different variables affecting the reaction were studied and optimized. The proposed methods were applied successfully for the analysis of SFSin tablets dosage forms. No interference was observed from common pharmaceutical excipients.

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Utylizacja ciekłych odpadów przemysłowych na drodze krystalizacji

Synowiec P., Bunikowska B.

Inżynieria i Aparatura Chemiczna

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2001

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Nr 5

31-32

PL

Omówiono dwie wybrane technologie zagospodarowania ciekłych odpadów przemysłowych, opracowane ostatnio w IChN. Pierwsza - związana jest z regeneracją odpadowego kwasu siarkowego (układ: H(2)SO(4)-CuSO(4)-H(2)O powstającego po ekstrakcji kobaltu z żużli konwertorowych w ilości 100 tyś. m(3)/rok. Druga - przedstawia zatężanie na drodze krystalizacji kwasu siarkowego (układ H(2)SO(4)-i-FeSO(4)-H(2)O powstającego po produkcji bieli tytanowej.

EN

Two selected technologies, worked out recently in the IChN, focused on the industrial liquid wastes utilization is presented. The first one deals with the utilization of waste sulphuric acid (system: H(2)SO(4)-CuSO(4)-H(2)O, in which 100000 cubic metres per year is formed during extraction of cobalt from the Bessemer slag. The second one describes the concentration by means of crystallization of the waste sulphuric acid from the titanium white production (system: H(2)SO(4)-FeSO(4)-H(2)O).