US3933872A

A method for the preparation of fatty hydroxamates wherein an agitated anhydrous slurry of hydroxylamine sulfate and a lower alkanol solution of a lower ester of a C 6 -C 22 fatty acid is reacted with dimethylamine to provide the corresponding hydroxamic acid which is subsequently neutralized with dimethylamine or an alkali metal base to yield, respectively, the ammonium or alkali metal salt ...

Utilisation of hydroxamates in minerals froth flotation ...

Jan 01, 1996· Following a critical review of the utilisation of chelating reagents (hydroxamates) in minerals flotation, results of a series of experiments performed in the presence of an experimental commercial hydroxamate as collector, at bench scale with two different ores and in a microflotation cell with several combinations of minerals (most of them "sparingly soluble minerals") are presented.

Recovery of PGMs from an oxide ore by flotation and leaching

flotation recoveries achieved using the sulphide co-collector schemes were 55.1% 3E (Pt, Pd and Au). Application of the hydroxamate oxide collector improved the flotation performance to recoveries of 74.7% 3E. The superior PGM recoveries achieved with hydroxamates probably lies in their ability to form complexes with metals such as iron.

Eagles 12 Collector Sodium Alkyl Hydroximic Acid As Copper ...

Eagles 12 is a flotation reagent of the chemical family of Hydroxyamates which as been developped by our company for copper and cobalt flottation ability enhancement. It yield very good results on both copper and cobalt.

Two New Structures of Hydroxamate Collectors and Their ...

lab. The chemical structures of them are listed in Table. 2. All other reagents, for example H 2SO4, were purchased from Fisher Scientific. Table 1 – Panzhihua deposit: Assay of the plant ore mill discharge (P80, 75 um) (data in wt%) Table 2 – Chemical structures of the hydroxamate collectors used in the flotation tests Reagents Chemical ...

REE bearing mineral recovery: a microflotation and surface ...

Mountain Pass ore using both fatty acid and alkyl hydroxamate collectors concluded that n‐ octanohydroxamate (OHA) was a more selective flotation reagent than the fatty acid (Pradip & Fuerstenau, 1983, Fuerstenau & Pradip, 1984, and Pradip & …

Hydroxamate for Copper Oxide Flotation

Hydroxamates, Alkyl hydroxamates and AERO 6493 Promoter are used interchangeably. Materials and Methods. Ores. Natural ore flotation was the main focus of this study [single mineral studies are adequately described in the literature]. Ore samples, from various operating mines and new mines, were used in this study.

Rare Earth Flotation Fundamentals: A Review

Colloids and Surfaces, 15, 137–146. (1988). Alkyl hydroxamates as collectors for the flotation of rare earth ores. In Rare Earths, Extraction, Preparation and Applications. TMS. .(1991). The role of inorganic and organic reagents in the flotation separation of rare-earth ores.International Journal of Mineral Processing, 32(1–2), 1–22. (2013).

Flotation '09, Cape Town, South Africa, November 9

14.00 Metallurgical performances of the sulphidization route and the direct alkyl hydroxamates flotation of mixed carbonated copper-gold ores of the Kansanshi deposit F.X. Paquot, A. Mukutuma, A. Delaney (First Quantum Minerals Ltd, Zambia) and D. Bastin (University of Liege, Belgium)

Molecular modeling and Rational Design of Flotation ...

In this communication, we describe the most important components of this novel paradigm of reagent design with the help of our recent work on alkyl hydroxamates, a relatively new family of flotation reagents, commercialized recently in the mining industry.

Prediction of Hydrophobic Reagent for Flotation Process ...

(CAs) > alkyl hydroxamates (AHs) > hydroxy aldehydes (HAs) > alkyl amines (AAs) and for fluoride AHs > CAs > HAs > AAs.2 The energies of interaction thus computed are used as a testing tool to discover the most selective reagent for an established surface.2−4 Also, another study demonstrated

Flotation of mixed copper oxide and sulphide minerals with ...

The Ausmelt alkyl hydroxamate is synthesised and supplied as an alkaline chemical, which differs from other hydroxamate collectors on the market. The stereochemistry of Ausmelt's alkyl hydroxamates has been studied to show that the hydroxamate exists with the oxygen atoms in a cis- (or Z-) structure relative to the C–N bond.

A Tof

acids, hydroxamates and dicarboxylic acids (Jun et al., 2003). Fatty acids have traditionally been the collector of choice in REE miner-als flotation due to their widespread availability and use in mineral flotation in general (Jordens et al., 2013). Early work comparing fatty acid and alkyl hydroxamate collectors as flotation reagents

Selectivity of Benzyl Hydroxamic Acid in the Flotation of ...

The decreased ground size of ilmenite-bearing ores challenges the selectivity of collectors of ilmenite. Taking advantage of flotation tests and density functional theory (DFT), the selectivity of benzyl hydroxamic acid (BHA) and the adsorption mechanism of oleate and BHA on ilmenite were systematically investigated. The flotation tests showed that BHA had good selectivity to ilmenite.

copper oxide flotation chemical reagent, copper oxide ...

Alibaba.com offers 478 copper oxide flotation chemical reagent products. About 0% of these are High Purity Reagents, 1% are General Reagents, and 1% are Other Chemical Reagents. A wide variety of copper oxide flotation chemical reagent options are available to you, such as classification, grade standard, and type.

Molecular Modeling of Interactions of Alkyl Hydroxamates ...

Molecular Modeling of Interactions of Alkyl Hydroxamates with Calcium Minerals ... computations on the molecular modeling of mineral–reagent interactions in a fluorite-calcite-fluorapatite–alkyl hydroxamate separation system were found to correlate remarkably well with the experimental microflotation test results. ... flotation reagents ...

Hydroxamate Collectors for Rare Earth Minerals Flotation ...

This paper investigated the effect of five alkyl hydroxamates and two aromatic hydroxamates on the flotation of a synthetic ore composed of pure, fully liberated, malachite and quartz.

US6341697B1

A method is disclosed for separating phosphate minerals from a mineral mixture, particularly from high-dolomite containing phosphate ores. The method involves conditioning the mineral mixture by contacting in an aqueous in environment with a collector in an amount sufficient for promoting flotation of phosphate minerals. The collector is a hydroxamate compound of the formula; wherein R is ...

Supply Sodium Alkyl Hydroxyl Oxime Acid Factory Quotes ...

Sodium Alkyl Hydroxyl Oxime Acid Flotation reagent of the chemical family of Hydroxyamates which as been developped by our company for copper and cobalt flottation ability enhancement. It yield very good results on both copper and cobalt.

US4629556A

An improved flotation process for removal of colored titaniferous impurities from kaolin clay uses as collector a hydroxamate compound, or a mixture of compounds, having the formula ##STR1## in which R is an alkyl, aryl, or alkylaryl group having 4-28, and preferably 6-24 carbon atoms, and M represents an alkali metal, an alkaline earth metal or hydrogen.

An Evaluation of Hydroxamate Collectors for Malachite ...

Request PDF | An Evaluation of Hydroxamate Collectors for Malachite Flotation | Copper oxide minerals, such as malachite, do not often respond well to traditional copper sulphide collectors, and ...

Recent advances in the recovery of tungsten values in the ...

Recent advances in the design of fine gravity concentrators and high gradient magnetic separation devices have led to significant improvements in the recovery of tungsten values in fine and ultrafine size range. Amongst the more promising techniques of fine particles processing, encouraging results are reported on froth flotation, shear flocculation and spherical agglomeration of tungsten ore ...

10.1016/S0927

Jun 11, 2020· The flotation response of cassiterite with alkyl hydroxamates depends on the hydrophobic chain length of the surfactant and particle size of the mineral. Results indicated good floatability of the three size classes studied (−208 to +37μm) in the pH range of 5.5–9.5 with octyl, decyl and tetra-decyl hydroxamates ( Figs. 5 and 7 ).

Physicochemical aspects of allanite flotation | Request PDF

Hydroxamates are N-alkyl derivatives of hydroxyl amine, which have a wide range of applications in the flotation of REE minerals [3,[18][19][20][21][22] [23], and other minerals such as malachite ...

The use of alkyl hydroxamates as collectors for oxide ...

either controlled potential sulfidization (CPS), followed by flotation, or direct flotation using hydroxamate reagents (Lee et al., 2009) are more attractive options. It is generally recognised that hydroxamates are good collectors for the 'well-defined' oxide copper minerals, such as malachite (Lee et al., 1998). Most well-defined oxide ...

Flotation reagents

The history of mineral flotation is a record of over a century of innovations, especially in the development of chemical reagents, the principles of their action, their manufacture and the role ...

Surface chemistry and flotation of cassiterite with alkyl ...

This paper investigated the effect of five alkyl hydroxamates and two aromatic hydroxamates on the flotation of a synthetic ore composed of pure, fully liberated, malachite and quartz.

Handbook of Flotation Reagents: Chemistry, Theory and ...

Handbook of Flotation Reagents: Chemistry, Theory and Practice is a condensed form of the fundamental knowledge of chemical reagents commonly used in flotation and is addressed to the researchers and plant metallurgists who employ these reagents. Consisting of three distinct parts: 1) provides detailed description of the chemistry used in mineral processing industry;