Abstract:
A slurry (3) of ground calcite ore in water is subjected to a froth flotation (30) wherein acid insoluble impurities are removed. The flotation process is enhanced by a two-stage pre-flotation conditioning accomplished by adding an acetate salt of a tall oil based imidazoline (5) to the slurry (3) and then mixing a nonpolar hydrocarbon oil (7) into the imidazoline treated slurry. The purified underflow calcium carbonate slurry (11) from the froth flotation is first dewatered to a solids content of 80% to 90% by weight. then reslurried with a dispersing agent (40) and subjected at a solids content of at least 75% by weight to a multi-stage media grinding process (60, 70, 80) wherein each grinding stage is charged with progressively finer grinding media. After degritting, the ground calcium carbonate slurry (17) is ready for shipment as a paper filler-grade product slurry (19) without further dewatering. Alternatively, the product slurry (19) may be passed through an additional fine media grinding stage (100) to-produce a paper coating-grade product slurry (21) also ready for shipment without further dewatering.
Abstract:
Procédé de traitement d'une argile pour en éliminer les impuretés minérales à base de titane, ce procédé comprenant les phases consistant à : (a) mélanger ladite argile, sous la forme d'une suspension aqueuse ayant une teneur en solides d'argile d'au moins 25 % en poids, avec un collecteur des impuretés minérales à base de titane, un agent réducteur et un activateur comprenant un sel ferreux hydrosoluble; (b) conditionner le mélange résultant de suspension aqueuse d'argile, de collecteur, d'agent réducteur et d'activateur, à une teneur en solides d'au moins 25 % en poids, pendant un temps suffisant pour y dissiper au moins 25 chevaux-vapeur-heures d'énergie par tonne de solides ; (c) soumettre le mélange conditionné à un traitement de flottation par moussage et éliminer les impuretés à base de titane avec la mousse ; et (d) récupérer de l'argile ayant une teneur réduite en impuretés minérales à base de titane.
Abstract:
This invention relates to a collector composition for the direct froth flotation of nonsulfide ores comprising a) 50 - 99 wt.-% of a mixture of fatty acids and b) 1 - 50 wt.-% of an N-acyl derivative of sarcosine of the formula (I) wherein R is a saturated or unsaturated hydrocarbon chain with 7 to 21 carbon atoms, wherein the mixture of comprises 10.0 - 35.0 wt.-% of fatty acid having a saturated C 11 hydrocarbon group, 2.5 - 15.0 wt.-% of fatty acid having a saturated C 13 hydrocarbon group, 10.0 - 25.0 wt.-% fatty acid having a monounsaturated C 17 hydrocarbon group and 20.0 - 45.0 wt.-% fatty acid having a bisunsaturated C 17 hydrocarbon group.
Abstract:
The method of the invention is directed to the polymerization of acrylamide and cationic or anionic monomer(s) in a salt solution with the use of PEI (Poly Ethylene Imine), SMA (Styrene Maleic Anhydrous) and non-ionic surfactant mixture as dispersant and the incorporation of PAC (Poly Aluminium Chloride) and/or a collodial silica during the polymerization for performance enhancement.
Abstract:
An improved method for purifying titania contaminated kaolin clay by froth flotation which features the use an hydroxamate flotation collector at a neutral or mildly alkaline pH wherein a slurry of the impure clay is conditioned for the flotation step in a baffled conditioning apparatus provided with mean for imparting sufficient mechanical energy to heat a dispersed slurry of the impure clay before flotation.
Abstract:
An improved method for purifying titania contaminated kaolin clay by froth flotation which features the use an hydroxamate flotation collector at a neutral or mildly alkaline pH wherein a slurry of the impure clay is conditioned for the flotation step in a baffled conditioning apparatus provided with mean for imparting sufficient mechanical energy to heat a dispersed slurry of the impure clay before flotation.
Abstract:
A process is provided for separation of at least one metal sulfide from a mixed sulfide concentrate. The process includes: subjecting the mixed sulfide concentrate to flotation in which at least one sulfide including antimony, arsenic and a first metal is floated and at least one sulfide including a second metal is depressed. The flotation yields a first metal concentrate having the at least one sulfide including antimony, arsenic and the first metal and a second metal concentrate having the at least one sulfide including the second metal. The first metal concentrate is leached to yield a further concentrate and a leach solution. The further concentrate includes the first metal and the leach solution includes soluble antimony and soluble arsenic. The process further includes oxidizing the leach solution to yield an antimony precipitate and an arsenic solution, and forming a stable arsenic compound from the arsenic solution.