Consiglio Nazionale Delle Ricerche

Consiglio Nazionale Delle Richerche

Anna M Marabini

Vittorio Alesse

Giorgio Bornengo

Filippo M Carlini

Giorgio Rinelli

Vincenzo Bertini

Angela De Munno

Bruno Passariello

Luigi Toro

Pei C Huang

Fabrizio Bergamini

Thomas Meloy

Marco Pocci

Bruno Paponetti

Maria Barbaro

2-mercapto-benzoxazole derivatives as collectors for the selective

A chemical process is described for removing ferric iron present in submarginal quantities in concentrates of kaolin, quartz, titanium minerals, ceramic minerals for glass, paper and electronics use and other materials of industrial interest by which ferric iron is reduced to ferrous iron using acid solutions, possibly in the presence of low concentrations of sugars containing 5 or more carbon atoms.

Process for removing iron from kaolin, quartz and other mineral

The present invention relates to a process for separating and recovering copper wires, lead grains coming and rubber grains coming from waste cables, through washing, gravimetric separation, screening and by flattening the lead grains thereby facilitating their ready recovery.

Process for separating and recovering lead, rubber and copper wires from

A process for the selective flotation of metal ores is described, wherein ionic organic collectors are utilized, which have the formula: ##STR1## where R and R.sub.1, like or different from each other, represent: H, a halogen, a straight or branched C.sub.1-9 alkyl group, an alkoxyl or hydroxyalkyl group in which the alkyl moiety contains from 1 to 9 carbon atoms, or a phenyl group; and M represents: H, Na, K, Li, Cs, NH.sub.4.

Process for the selective flotation of metal ores using

Ionic organic collecting agents for the selective flotation of lead and zinc ores, said agents having the following general formula ##STR1## wherein the symbols employed have the meaning given below: R represents H, CH.sub.3, C.sub.2 H.sub.5, or an alkoxyalkyl group,

Collecting agents for the selective flotation of lead and zinc ores and

Flocculating agents for the selective flocculation of ultrafine granulometry titanium and iron ores suspended in water, said agents being made up of polymeric or copolymeric compounds containing as the monomeric units the monomers of formula I ##STR1## wherein R.sup.1 and R.sup.2, which can be the same or different, represent a --O--CHR.sup.5 --O--bridge, or two hydroxyl groups which can also be in the form of their ether or ester derivatives, and in which formula one of the symbols R.sup.3, R.sup.4 or R.sup.5 corresponds to an atomic group containing, at a position variously spaced from the substitution site, a polymerizable system which is preferably an olefinic system activated with respect to polymerization reactions, whereas the other symbols, which can be the same or different, can be hydrogen atoms or alkyl, aryl, hydroxyl, alkoxyl, hydroxyalkyl, alkoxyalkyl, haloakyl, carbonyl, carboxyl, ester, amido, nitrilo, or sulfonic groups, or halogen atoms or nitro groups. The copolymerizable comonomers which can be copolymerized with said monomers of formula I are made up of olefinic compounds which are active towards polymerization reactions and contain groups whose hydrophilic character changes with the pH values.

Synthetic organic polymers for the selective flocculation of titanium

A process for rutile flotation from rutile ores associated with iron containing components, in which process an alcoholic solution is employed of N-benzoyl-N-phenylhydroxylamine as a flotation collector of rutile. This process is especially suitable for rutile separation by flotation from rutile-hematite ores, with the use of said selective collector at pH values between 1 and 2.5.

Process for rutile flotation by means of N-benzoyl-N-phenylhydroxylamine

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Frascati, Italy

Anna M Marabini