Investigation of the kinetics of chalcopyrite oxidation by potassium dichromate

Kinetics of Chalcopyrite Leaching by Hydrogen Peroxide in Sulfuric Acid

“…Therefore, it is convenient to treat these ores using some of the hydrometallurgical processes. Leaching of copper from chalcopyrite requires the presence of the oxidants in an acidic environment; some of the frequently present oxidants are: the ferric ions [3][4][5][6][7][8][9], the cupric ions [10][11][12], some acidophilic bacteria [13][14][15][16][17][18], the nitrate ions [19,20], the nitrite ions [21,22], the dichromate ions [23,24], the manganese ions [25,26], the permanganate ions [27], the chlorate ions [28], the oxygen ions [29][30][31][32][33][34], ozone [35], the silver ions [36,37], and the use of microwaves [38,39].…”

A study on the sulphuric acid leaching of copper converter slag in the presence of dichromate

“…Recently, dichromate compounds have been considered as oxidizing agents for dissolving the sulphide minerals in some studies. For this purpose, oxidation of pyrite (Antonijevic et al, 1993) and chalcopyrite (Antonijevic et al, 1994) by using potassium dichromate and sulphuric acid has been studied. Similarly, it has been shown that sodium dichromate could be used as an oxidant to remove some copper sulphide minerals from molybdenite concentrates (Ruiz and Padilla, 1998).…”

Probing the effect of aqueous impurities on the leaching of chalcopyrite under controlled conditions

“…Acidic ferric sulfate has been the most widely applied facilitative oxidant (Nazari et al, 2011). The actions of other chemical oxidants such as K 2 Cr 2 O 7 and NaNO 3 (Antonijević et al, 1994;Aydogan, 2006;Sokić et al, 2009) have also been examined. While it has been found that K 2 Cr 2 O 7 and NaNO 3 enhance the copper extraction rate from chalcopyrite, the specific effects of K + and Na + on chalcopyrite leaching were not discussed.…”