Collectors, flotation

Collagen [9007-34-5] Collagen [9059-25-0] Collagenase [9001-12-1] Collective marks CoUectorless flotation Collector reagents Collectors... 

Table 3. Flotation Collectors Used in the Minerals Industry and Their Areas of Application...

Although phosphine [7803-51-2] was discovered over 200 years ago ia 1783 by the French chemist Gingembre, derivatives of this toxic and pyrophoric gas were not manufactured on an industrial scale until the mid- to late 1970s. Commercial production was only possible after the development of practical, economic processes for phosphine manufacture which were patented in 1961 (1) and 1962 (2). This article describes both of these processes briefly but more focus is given to the preparation of a number of novel phosphine derivatives used in a wide variety of important commercial appHcations, for example, as flame retardants (qv), flotation collectors, biocides, solvent extraction reagents, phase-transfer catalysts, and uv photoinitiators. 

Flotation Reagents. Only one sulfide mineral flotation collector is manufactured from phosphine, ie, the sodium salt of bis(2-methylpropyl)phosphinodithioic acid [13360-78-6]. It is available commercially from Cytec Industries Inc. as a 50% aqueous solution and is sold as AEROPHINE 3418A promoter. The compound is synthesized by reaction of 2-methyl-1-propene [115-11-7] with phosphine to form an iatermediate dialkylphosphine which is subsequently treated with elemental sulfur [7704-34-9] and sodium hydroxide [1310-73-2] to form the final product (14). The reactions described ia equations 10 and 11... 

Gonzales, G., The Recovery of Chrysocolla with Different Long Chain Surface-active Agents as Flotation Collectors, Journal of Applied Chemistry Biotechnology, Vol. 16, No. 28, pp. 31-38, 1978. 

During oxide lead flotation, the choice of collector is rather limited to xanthates, which are used in operating plants. Dithiophosphates and mercaptans are used as secondary collectors. This is due to the fact that natural ores contain a variety of floatable gangues, for which the anionic flotation process is not applicable. The use of chelating agents as flotation collectors for oxide lead flotation have been extensively examined [5,6], Oximes/fuel oil... 

The sulphosuccinamate surfactants were first synthesized by American Cyanamid Company (currently Cytec, USA) in the late 1940s. Later in 1968, the alkyl sulphosuccinamate [10] was patented as a flotation collector. 

The use of quinolines [7] were examined with the addition of fuel oil as co-collector. According to the data provided (Table 22.5), quinolines are effective pyrochlore flotation collectors. The number of carbons in the quinoline structure determines the grade and recovery of pyrochlore. 

Nonsolvent bath, polymer precipitation by immersion in, 15 808-811 Nonspecific elution, in affinity chromatography, 6 398, 399 Nonstationary Poisson process, in reliability modeling, 26 989 Non-steady-state conduction, 9 105 Nonsteroidal antiinflamatory agents/drugs (NSAIDs) 21 231 for Alzheimer s disease, 2 820 for cancer prevention, 2 826 Nonsulfide collectors, 16 649 Nonsulfide flotation, 16 649-650 Nonsulfide mineral flotation collectors used in, 16 648-649t modifiers used in, 16 650, 651t Nonsulfide ores, 16 598, 624... 

Yu Runlan, Hu Yuehua, Qiu Quanzhou, Qin Wenqing, 2004c. Interaction mechanism of jamesonite with flotation collectors by cyclic voltammetry. Journal of Central South University, 35(2) 202 - 206 (in Chinese)... 

Froth flotation has proven to be an efficient method of removing titaniferous impurities (mainly iron-rich anatase) from kaolin clays. Fatty acid reagent, primarily tall oil, is used extensively in the reverse flotation of these impurities. This flotation collector typically requires divalent cations (usually Ca +) to activate the coloured impurities and enhance collector adsorption. This is not very selective since the tall oil can also absorb on the kaolinite particles. Alkyl hydroxamate collectors are relatively new in the kaolin industry but provide significant advantages. Hydroxamates do not require activators, substantially increase the removal of colored impurities and are very selective. 

The flotation responses of the kaolin samples to the various flotation collectors were measured using the separation efficiency (SE) index. This index combines both grade and recovery to describe the efficiency of the beneficiation process. The mathematical expression used to compute the separation efficiency is the following ... 

---