Rare earth ore collector, preparation method and ore dressing process of low-grade hard-selection rare earth ore
A rare earth ore and collector technology, applied in chemical instruments and methods, flotation, magnetic separation, etc., can solve problems such as difficult to obtain production indicators, poor operating conditions, expensive chemicals, etc., to expand the range of REO grades , saving rare earth ore resources, and overcoming the large impact of flotation operations
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Embodiment 1
[0043] Weigh 30kg of 2-naphthoic acid in an enamel reaction kettle, add 60Kg of methanol to the reaction kettle, and after it is completely dissolved, add 9Kg of concentrated sulfuric acid while stirring, react for 30 hours under heating and reflux, and stand until crystallization is complete; weigh 30Kg of crystals, add 10% aqueous solution of hydroxylamine hydrochloride according to the ratio of solid mass 2:1, then add dropwise alkaline aqueous solution of sodium hydroxide to make the pH of the solution 9, then raise the temperature of the solution to 35°C, react for 5 hours and use the mass Adjust the pH to 4 with a fraction of 10% sulfuric acid, filter, and dry the filter residue to obtain 2-naphthyl hydroxamic acid.
[0044] Take 30Kg of 2-naphthohydroxamic acid and mix it with 15Kg of methyl salicylate, then add an aqueous solution containing 5Kg of sodium hydroxide solid, heat in a water bath and keep stirring at 20°C for 2 hours to obtain a collector for rare earth min...
Embodiment 2
[0049] Weigh 25kg of 2-naphthoic acid in an enamel reaction kettle, add 60Kg of methanol to the reaction kettle, and after the solid is completely dissolved, add 9Kg of concentrated sulfuric acid while stirring, react under reflux for 35 hours, and then stand until the crystallization is complete; Said to obtain 2-naphthalene hydroxamic acid of 25Kg, adding the mass fraction is 10% hydroxylamine hydrochloride aqueous solution by the ratio of solid mass 1:1, then dripping sodium hydroxide alkaline aqueous solution makes the solution pH value be 10, then rise Increase the solution temperature to 45°C, react for 6 hours, acidify with 10% sulfuric acid to pH 4, filter and dry to obtain 2-naphthohydroxamic acid.
[0050] Take 25Kg of 2-naphthohydroxamic acid and 15Kg of methyl salicylate and mix evenly, then add an aqueous solution containing 10Kg of sodium hydroxide solid, heat in a water bath and keep stirring at 23°C for 2 hours to obtain rare earth ore. Receiver.
[0051] Usin...
Embodiment 3
[0055] Weigh 30kg of 2-naphthoic acid in an enamel reaction kettle, then add 60Kg of methanol, after it is completely dissolved, stir and add 9Kg of concentrated sulfuric acid, react under reflux for 33 hours, let stand until crystallization is complete, and filter to obtain crystallization; weigh 30Kg To crystallize, add hydroxylamine hydrochloride aqueous solution with a mass fraction of 10% according to the ratio of solid mass 2:3, then add dropwise alkaline aqueous solution of sodium hydroxide to make the pH of the solution 10, heat to 55°C, react for 5 hours and use the mass fraction Acidification with 10% sulfuric acid to pH is 5, filters the solution, and dries the obtained filter residue to obtain 2-naphthyl hydroxamic acid;
[0056] Mix 30Kg of 2-naphthyl hydroxamic acid with 30Kg of methyl salicylate, then add an aqueous solution containing 15Kg of sodium hydroxide solid, heat in a water bath and stir at 25°C for 2 hours to obtain a rare earth ore collector.
[0057]...
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