Copper oxide ore is characterized by low ore grade, fine embedded particle size and severe slime coating, which is a difficult ore to be processed in China [1].Malachite [Cu 2 (OH) 2 CO 3] is a classic type of copper oxide and can be widely applied in copper metal extraction [2].And it is a type of hydroxy copper carbonate, which is formed by oxidation and chemical …
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Alkyl derivatives of benzotriazole (1-12 carbon atom long alkyl chain) were tested as inhibitors of pure iron corrosion in sulphuric or hydrochloric acid at 25°C and pure copper corrosion in ...
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In the first part of the work, the influence exerted on benzotriazole (BTAH) inhibiting efficiency by the length of the aliphatic chain in position 5 of the aromatic molecule has been …
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By simple immersion in a diluted (10 −4 M), hot (60 °C) aqueous solution of 5-alkyl-benzotriazolic derivatives, thin and colourless films are formed on pure copper, which can decrease the AR attack by inhibiting both the anodic copper oxidation reaction and the oxygen reduction process. The characteristics of the films formed by the adopted ...
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4.01.11.6 Corrosion Inhibition. Benzotriazole and its derivatives have found widespread use as corrosion inhibitors for copper and its alloys. A huge number of patents have appeared since the mid-1980s. Polymeric tapes or sheets coated with adhesive containing acrylic polymer emulsions of benzotriazole and tripolyphosphate salts can protect copper and copper alloys against …
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Influence of the alkyl chain on the protective effects of 1,2,3-benzotriazole towards copper corrosion. Part ii: formation and characterization of the protective films ... A copper layer was electroplated on the gold surface from 0.5 M CuSO 4 +0.5 M H 2 SO 4 solution with a 30 mA cm −2 current for 360 s ...
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Until recently, flotation of copper oxides would normally have been conducted in distinct campaigns to produce a copper concentrate which may not be saleable under existing contracts. ... 1969, Nagaraj, 1992). Evrard and De Cuyper (1975) pioneered the use of alkyl hydroxamates for floating copper–cobalt ores in Africa. In the 1970's ...
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The recovery of these copper minerals by flotation or hydrometallurgy from ores, typically containing 0.5%TCu (open pit mines) and 1-2%TCu (underground mines) is of great …
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The flotation reagents listed in this book are current as of June 2009. The user ... 6.2 Copper Ores 22 6.3 Low Grade Copper-Gold Ores 23 6.4 Lead-Zinc Ores 24 6.5 Copper-Zinc Ores 24 6.6 Copper-Lead-Zinc Ores 25 6.7 Nickel Ores 26 Planning and Analysis of Flotation Reagent Plant Trials Using the Paired t-test 27
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According to some data, amino-substituted of 1,2,4-triazole (TA) may exceed BTA in the effectiveness of copper protection in neutral aqueous solutions [4, [18], [19], [20]].It was shown in [20, 21], the introduction of hydrophobic R, such as 5-C 5 H 11 or 5-C 6 H 5-, into the 3-AT molecule substantially increases the adsorption ability of the inhibitor on copper.
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Limitations of these procedures in combination with our ongoing research on benzotriazole mediated novel synthetic methodologies [26-37] prompted us to envision a novel, simple and facile protocol for the synthesis of a variety of N 1 - alkyl/aryl benzotriazole derivatives under mild reaction condition without using the hazardous chemicals ...
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The pH of the pulp was 10-10.3 which may be beyond the upper limit for effective oxide copper flotation with alkyl hydroxamate. The sulfides were floated (for 10 rain.) in a rougher stage with 46 g/t of AERO208 Promoter (a dithiophosphate collector) followed by an oxide float (5 min.) with 80 g/t AERO6493 Promoter in the scavenger stage. ...
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5-Alkyl derivatives of benzotriazole (1–12 carbon atom long alkyl chain) were tested as inhibitors of pure iron corrosion in sulphuric or hydrochloric acid at 25°C and pure copper corrosion in …
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：A flotation process in which copper ores or copper converter slags are ground and firstly have added thereto benzotriazole or alkyl benzotriazole as an activator and secondly one or more collectors selected from the group consisting of xanthates, dithiophosphates, thiocarbamate esters, dithiocarbamates, mercaptans and dixanthogens and ...
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The 2D structures of the synthesized derivatives of N-alkyl benzotriazole and N-alkybenzimidazole, as well as the control (fluconazole), were sketched in the ChemDraw program and saved as an SD file. The drawn structures were imported into the graphic user interphase (GUI) of Spartan 14, which was followed by converting the 2D molecular models ...
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The discovery of benzotriazole dates back to the late 19th century, when its synthesis was first reported in 1889 by G. Schultz [9]. Initially, benzotriazole found industrial applications as a corrosion inhibitor, particularly for metals such as copper, zinc, and aluminum, due to its ability to form a protective film on metal surfaces [10].
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Benzotriazole (BTAH) has now been in use for many years for the protection of copper and copper alloys against various forms of corrosion. In this review, the chemistry of …
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Here is a comparison of two Hydroxamate Collectors used for the flotation of Oxide copper, namely CTC3 from OXFLO and AM2 (AKA Rinkalore) from AXISHOUSE. This report contains a comparison of the scoping test-work done by both suppliers to determine which one is the best Oxide Collector.. Test Summary #1. Flotation by Hydroxamate: OXFLO' CTC3 vs …
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The bonding of benzotriazole—an outstanding corrosion inhibitor for copper—on reduced and oxidized copper surfaces is discussed on the basis of density functional theory …
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A continuing challenge in materials design is the achievement of high operational efficiency through improvements in performance criterion, particularly its service life-time characteristics. Benzotriazole (BTAH) has now been in use for many years for the protection of copper and copper alloys against various forms of corrosion. In this review, the chemistry of …
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Co-catalytic effect of WS 2 on the copper slag mediated peroxodisulfate activation for the simultaneous elimination of typical flotation reagent benzotriazole and Cr(VI) Author links open overlay panel Bo Ma a, Jun Yao a, Tatjana Šolević Knudsen b, Zhihui Chen a, Wancheng Pang a, Bang Liu a, Ying Cao a, Xiaozhe Zhu a, Chenchen Zhao a
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According to the process of the present invention, a copper benzotriazole or copper alkyl benzotriazole in which benzotriazole or alkyl benzotriazole is coupled with copper atoms...
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for the flotation of copper sulfide ores such as a xan thate, mercaptan or thiocarbamate ester. Such a pro cess is referred to as a sulfidizing process. This process ... benzotriazole or copper alkyl benzotriazole to the floatable conditions. With the addition of only benzotriazole or alkylben
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The 1-[α-(alkylthio)alkyl] and 1-[α-(arylthio)alkyl]-1H-benzotriazole intermediates are easily prepared as shown in Scheme 46. 103. Download: Download full ... his thesis entitled 'Some chemo and enantioselective esterification methods and copper (I) promoted rearrangement of 2,2,2-trichloroethyl carboxylates'. He worked in the group of ...
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Evrard and De Cuyper (1975) pioneered the use of alkyl hydroxamates for floating copper–cobalt ores in Africa. In the 1970's, ... can not be used in sulphide/oxide blends for simultaneous sulphide and oxide copper flotation as the sulphidising reagent will suppress the flotation of sulphide minerals as shown within this case study.
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The research projects of the latest decade clearly demonstrated that the first-order flotation rate constant is linearly related to S b, the bubble surface area flux, which in turn is inversely related to the bubble size (Gorain et al., 1997).The size of bubbles is mainly determined by frothers which operate by preventing bubbles from coalescence.
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IN COPPER ORE FLOTATION * Przemyslaw B. KOWALCZUK, Jan DRZYMALA Wroclaw University of Science and Technology, Faculty of Geoengineering, Mining and Geology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland, [email protected] Abstract: Froth flotation is widely used for upgrading of ores and other materials. Efficiency of
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An electrochemical investigation on the prevention of staining of copper by benzotriazole. Corros Sci. 1963; 3 (1): 69–74. Crossref. Google Scholar. Bregman JI. Corrosion ... Chirkunov AA Kuznetsov YI Shikhaliev KS et al. Adsorption of 5-alkyl-3-amino-1,2,4-triazoles from aqueous solutions and protection of copper from atmospheric corrosion. ...
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Synthesis and Performance of New Benzotriazole Derivatives with Long Alkyl Chain as Corrosion Inhibitors: Xiang ZUO 1, 2 (),Yufeng JIANG 1,Ting CHI 1,Xin HU 1,Dongmei CAO 1,Feng CAI 2: 1. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing 210019, China 2. College of Materials Science and Engineering, Nanjing …
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U.S. Pat. No. 4,022,686 provides a flotation process for copper sulfide and copper oxide ores and for copper smelter slags, wherein benzotriazole or alkyl benzotriazole is added to...
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Abstract: A flotation process in which copper ores or copper converter slags are ground and firstly have added thereto benzotriazole or alkyl benzotriazole as an activator and secondly one or more collectors selected from the group consisting of xanthates, dithiophosphates, thiocarbamate esters, dithiocarbamates, mercaptans and dixanthogens and further, if desired, a promoter …
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For example, self assembly and dynamics of alkyl ammonium surfactants on a montmorillonite surface (Heinz et al., 2007) and reactivity of an interacting hydroxyl radical on a hydroxylated crystalline silica surface (Konecny, 2001), are attempted to predict overall flotation response of clay mineral systems. ... a few experiments were carried ...
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On the basis of the structure of 4,5,6,7-tetrabromo-1H-benzotriazole (TBBt), a highly selective inhibitor of protein kinase 2 (CK2) [63], bromo-, chloro- and methyl-analogues of benzotriazole and their N-alkyl derivatives (21a–g) (Fig. 17) were synthesized and evaluated for their in vitro antiprotozoal activity against Acanthamoeba ...
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5-Alkyl derivatives of benzotriazole (1–12 carbon atom long alkyl chain) were tested as inhibitors of pure iron corrosion in sulphuric or hydrochloric acid at 25°C and pure copper corrosion in acidic sulphate and saline solutions at 30°C. This series of compounds was more efficient in contrasting copper than iron corrosion and, generally, the longer the alkyl chain the …
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Benzotriazole (BTAH) is one of the best corrosion inhibitors for Cu and its alloys. It is effective in preventing copper corrosion under stationary as well as dynamic conditions. Its …
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It is well known that hydrocarbon oil collectors and frothers like MIBC (methyl isobutyl carbinol) or pine oil can be very effectively used in removing ash minerals from coals by flotation [45].Liu and Somasundaran [46] showed that the difference between attachment times for coal and pyrite at the oil–water interface (6.3 ms) was almost 10 times lower than that at the air–water interface ...
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A critical analysis of the available information and data, based on several case studies, flotation testing, and microscopic analysis indicates that alkyl hydroxamates can effectively recover well-defined oxide minerals of copper, but not copper occurrences such as Cu-bearing goethite (often misidentified as cuprite) which report as Acid Soluble copper in …
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The formation of protective layers on copper, zinc and copper–zinc (Cu–10Zn and Cu–40Zn) alloys at open circuit potential in aerated, near neutral 0.5M NaCl solution containing benzotriazole ...
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Dipping copper and copper alloys into a solution or dispersion of soluble fer- ricyanides and a benzotriazole derivative for 0.5 to 30 minutes arrests corrosion and tarnishing.
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