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Application of n-tetradecyl isopropanolamine as collecting agent in scheelite flotation

A technology of n-tetradecyl isopropanolamine and tetradecyl isopropanolamine is applied in the application field of n-tetradecyl isopropanolamine as a collector in scheelite flotation, and can It is not easy to solve the problems of collectors, the flotation effect of scheelite is not obvious, the chemical system and flotation process are complicated, etc., to achieve the effect of simple use process, simple chemical system, and simple use process

Active Publication Date: 2020-06-30
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the traditional anionic collector sodium oleate, cationic collectors are more selective for scheelite, but the selection of cationic collectors can not only achieve efficient separation of scheelite and gangue mineral calcite, but also ensure the recovery of scheelite. Collectors with improved efficiency are not easy, such as linear alkyl primary amine salts - dodecylamine, tetradecylamine and octadecylamine acetate in the flotation of scheelite, calcite and fluorite , the flotation effect on scheelite is not obvious, indicating that the separation effect of alkyl primary amine salt on scheelite, calcite and fluorite is not ideal (Li Shiliang. Separation of scheelite and calcium vein by cationic collector flotation Experimental research on stone minerals [D]. Central South University, 2013); for another example, in the five kinds of quaternary ammonium salts used in the test, except cationic surfactant 1231, other quaternary ammonium salts have no effect on scheelite, calcite and fluorite. It has a certain selectivity, and has the potential to realize the flotation separation of scheelite, calcite and fluorite, but the flotation separation effect on mixed ores needs to be further improved (Li Shiliang. Cationic collector flotation separation of scheelite and fluorite) Experimental research on gangueite minerals [D]. Central South University, 2013)
[0004] In order to meet the needs of flotation separation of scheelite and gangue mineral calcite, the current flotation operation generally has the problem of complex reagent system and flotation process

Method used

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  • Application of n-tetradecyl isopropanolamine as collecting agent in scheelite flotation
  • Application of n-tetradecyl isopropanolamine as collecting agent in scheelite flotation
  • Application of n-tetradecyl isopropanolamine as collecting agent in scheelite flotation

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Experimental program
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preparation example Construction

[0024] In the present invention, the preparation method of described n-tetradecyl isopropanolamine preferably comprises the following steps:

[0025] adding the mixed liquid of propylene oxide and absolute ethanol into liquid tetradecylamine for addition reaction to obtain crude n-tetradecyl isopropanolamine;

[0026] The crude n-tetradecyl isopropanolamine is sequentially subjected to vacuum distillation, recrystallization, filtration, freezing and drying to obtain the n-tetradecyl isopropanolamine.

[0027] In the present invention, unless otherwise specified, the medicaments are commercially available products well known to those skilled in the art.

[0028] In the present invention, the mixed liquid of propylene oxide and absolute ethanol is preferably added dropwise into liquid tetradecylamine for addition reaction to obtain crude n-tetradecyl isopropanolamine. In the present invention, when tetradecylamine is solid, the method for obtaining the liquid tetradecylamine is...

preparation example

[0046] Drop the mixture of 0.21mol propylene oxide and 50mL absolute ethanol into 0.20mol liquid tetradecylamine at a rate of 5mL / h, and carry out addition reaction at 40°C for 13h to obtain crude n-tetradecyl Isopropanolamine;

[0047] After the crude n-tetradecyl isopropanolamine is distilled under reduced pressure at 80°C under the pressure of saturated water vapor pressure and 80°C, the distillation product is recrystallized with ethyl acetate and ethanol, and the obtained product is filtered The obtained solid product was filtered, frozen at -20° C. for 4 hours, and dried at 35° C. under vacuum for 12 hours to obtain the n-tetradecyl isopropanolamine.

[0048] Infrared test is carried out to the n-tetradecyl isopropanolamine obtained in the preparation example, and the gained test chart is shown in figure 1 . The obtained n-tetradecyl isopropanolamine of the preparation example is carried out nuclear magnetic resonance, and the gained hydrogen spectrogram is shown in ...

Embodiment 1

[0050] Put 2g of scheelite ore sample into the flotation cell, according to the ratio of the mass of scheelite ore sample to the volume of deionized water is 1g: 18mL, add deionized water, use hanging cell flotation machine, at 1704rpm Stir for 2 min at lower temperature to obtain the primary slurry; at room temperature, use 1mol / L HCl solution and NaOH solution as the pH adjuster to adjust the pH value of the primary slurry to 6, and stir for 2 min at 1704 rpm to keep the pH value at 6. Obtain scheelite pulp;

[0051] According to 50mg collector / 1L scheelite pulp, add collector n-tetradecyl isopropanolamine to the obtained scheelite pulp, stir at 1704rpm for 2min, then carry out mineral flotation scraping, flotation After 2min, concentrate ore (foam product) and tailings (product in the tank) are obtained; the process flow chart is shown in image 3 .

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Abstract

The invention belongs to the technical field of beneficiation, and particularly relates to application of n-tetradecyl isopropanolamine as a collecting agent in scheelite flotation. According to the method, the collecting agent n-tetradecyl isopropanolamine is low in toxicity and free of pollution, strong electrostatic adsorption, hydrogen bond adsorption and physical adsorption exist between thecollecting agent n-tetradecyl isopropanolamine and scheelite, high selectivity is achieved for mixed ore of scheelite and gangue mineral calcite, the collecting agent n-tetradecyl isopropanolamine does not need to be compounded with other collecting agents, the using process is simple and convenient, and the agent system is simple. Test results show that the amine collecting agent n-tetradecyl isopropanolamine provided by the invention is used for scheelite mineral flotation collection, the scheelite recovery rate reaches 96.89%, the calcite recovery rate is only 8.68%, and the amine collecting agent n-tetradecyl isopropanolamine has the advantages of high selectivity, simple use process, simple reagent system and good flotation effect.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to the application of n-tetradecyl isopropanolamine as a collector in scheelite flotation. Background technique [0002] Collectors are the most important type of flotation agents that change the hydrophobicity of the mineral surface and make the floating ore particles adhere to the air bubbles. It has two basic properties: (1) It can be selectively adsorbed on the mineral surface; (2) It can improve the hydrophobicity of the mineral surface, making it easy to adhere to the air bubbles, thereby improving the buoyancy of the mineral. Separation of scheelite from calcium-bearing gangue minerals has always been a recognized problem in the field of mineral processing. Tungsten is found in more than 20 kinds of tungsten-containing minerals in the earth's crust, most of which are tungstates, of which only scheelite CaWO 4 (including WO 3 80.60%) and wolframite (F...

Claims

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Application Information

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IPC IPC(8): B03D1/01B03D1/02B03D101/02B03D103/02
CPCB03D1/01B03D1/02B03D2201/02B03D2203/02
Inventor 刘畅曾桂生王忠兵倪晨全罗旭彪任重杨利明邵鹏辉熊贞晟刘廷玺
Owner NANCHANG HANGKONG UNIVERSITY
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