Halogenated benzohydroxamic acid collecting agent and application thereof in mineral flotation

A technology of halogenated benzyl hydroxamic acid and o-fluorobenzoic hydroxamic acid, which is applied in the field of halogenated benzyl hydroxamic acid collectors, and can solve problems such as insufficient collection capacity of benzyl hydroxamic acid

Pending Publication Date: 2021-09-14
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent application with publication number 101579653A discloses a combination agent of sulfated oleic

Method used

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  • Halogenated benzohydroxamic acid collecting agent and application thereof in mineral flotation
  • Halogenated benzohydroxamic acid collecting agent and application thereof in mineral flotation
  • Halogenated benzohydroxamic acid collecting agent and application thereof in mineral flotation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This example provides a preparation method of o-fluorobenzoic hydroxamic acid, the steps are: mix 10.0 g of o-fluorobenzoic acid and 50 mL of methanol, then add 1.0 g of concentrated sulfuric acid catalyst, heat to 80 ° C, stir and reflux for 3 hours , obtain the methyl o-fluorobenzoate fraction by distillation under reduced pressure (80°C);

[0054] Dissolve 6.45 g of hydroxylamine hydrochloride in 30 mL of methanol solution, add sodium methoxide, and filter to remove the sodium chloride generated by the reaction to obtain hydroxylamine solution;

[0055] Mix the obtained methyl o-fluorobenzoate and hydroxylamine solution evenly, add sodium hydroxide methanol solution, react at 30°C for 5 hours, add concentrated sulfuric acid, and obtain o-fluorobenzoic acid hydroxamic acid, the structural formula is as follows, a total of 14.5g . The infrared spectrum of o-fluorobenzohydroxamic acid is shown in figure 1 .

[0056]

Embodiment 2

[0058] This embodiment provides a kind of preparation method of 3,4-difluorobenzoic acid, and the steps are: mix 10.0g 3,4-difluorobenzoic acid and 50mL ethanol, then add 1.0g benzenesulfonic acid catalyst, Heated to 90°C, stirred and refluxed for 5 hours, and obtained 3,4-difluorobenzoic acid ethyl ester fraction by vacuum distillation (100°C);

[0059] Dissolve 5.27 g of hydroxylamine hydrochloride in 30 mL of ethanol solution, add sodium ethoxide, filter to remove the sodium chloride generated by the reaction, and obtain hydroxylamine solution;

[0060] Mix the obtained ethyl 3,4-difluorobenzoate and hydroxylamine solution evenly, add sodium hydroxide ethanol solution, react at 50°C for 3 hours, add concentrated sulfuric acid, and obtain 3,4-difluorobenzhydroxime Acid, the structural formula is as follows, a total of 12.5g.

[0061]

Embodiment 3

[0063] This example provides a preparation method of perfluorobenzoic acid, the steps are: mix 10.0 g of perfluorobenzoic acid and 50 mL of butanol, then add 1.0 g of tere-benzenesulfonic acid catalyst, heat to 120 ° C, stir Reflux for 7 hours, and obtain perfluorobenzoic acid butyl fraction by vacuum distillation (120° C.);

[0064] Dissolve 3.6 g of hydroxylamine hydrochloride in 30 mL of chloroform solution, add sodium ethoxide, filter to remove the sodium chloride generated by the reaction, and obtain hydroxylamine solution;

[0065] Mix the obtained butyl perfluorobenzoate and hydroxylamine solution evenly, add sodium hydroxide butanol solution, react at 50°C for 6 hours, add concentrated sulfuric acid, and obtain perfluorobenzoic hydroxamic acid, the structural formula is as follows, a total of 10.5 g.

[0066]

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Abstract

The invention relates to the technical field of mineral flotation, and particularly discloses a halogenated benzohydroxamic acid collecting agent and application thereof in mineral flotation. The halogenated benzohydroxamic acid collecting agent provided by the invention comprises at least one of compounds shown in the formula (I). According to the halogenated benzohydroxamic acid provided by the invention, after the benzohydroxamic acid is subjected to halogen modification, a hydrophobic parameter logP of a molecule is positively responded, and the contribution rate of the unit molecule to the hydrophobic property of the mineral surface is remarkably improved by changing the logP of the molecule; meanwhile, compared with benzohydroxamic acid, halogenated benzohydroxamic acid can change the chelating capacity of the compound on positioning ions on the surfaces of all minerals, chelating groups in molecules generate a new chelating relation on the positioning ions on the surfaces of the minerals, then the separation efficiency in the mineral flotation process is improved, and the separation effect of a flotation system is improved.

Description

technical field [0001] The invention relates to the technical field of mineral flotation, in particular to a collector of halogenated benzyl hydroxamic acid and its application in mineral flotation. Background technique [0002] Hydroxamic acid collectors have been widely used in mineral engineering as flotation collectors for copper oxide ore, black and white tungsten ore, rare earth and tin ore. However, in the flotation process using hydroxamic acid, there are still disadvantages such as poor collection capacity and large reagent consumption. [0003] At present, in order to solve the above defects of hydroxamic acid collectors, researchers of ore dressing and pharmaceuticals have done a lot of work, mainly from the aspects of mixing and combining different types of pharmaceuticals and improving the molecular structure of pharmaceuticals. For example, the Chinese patent application with publication number 101579653A discloses a combination agent of sulfated oleic acid so...

Claims

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Application Information

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IPC IPC(8): B03D1/01B03D101/02B03D103/02
CPCB03D1/01B03D2201/02B03D2203/02
Inventor 李方旭周晓彤林日孝
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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