Water-in-oil emulsion as well as preparation method and application thereof

A water-in-oil type and emulsion technology, which is applied in the direction of improving process efficiency and can solve problems such as inability to achieve directional metal recovery

Active Publication Date: 2022-04-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metals can be recovered from circuit boards, various metals in the obtained metal powder are mixed together, and the directional recovery of metals cannot be realized

Method used

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  • Water-in-oil emulsion as well as preparation method and application thereof
  • Water-in-oil emulsion as well as preparation method and application thereof
  • Water-in-oil emulsion as well as preparation method and application thereof

Examples

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preparation example Construction

[0046] The present invention also provides a preparation method of the water-in-oil emulsion described in the above technical solution, comprising the following steps:

[0047] The kerosene, the surfactant, the carrier and the inner aqueous phase solution are mixed to obtain the water-in-oil emulsion. In the present invention, the mixing is preferably carried out under stirring conditions; the stirring speed is preferably 2500-3500rpm, more preferably 2600-3300rpm, more preferably 2800-3000rpm; the time is preferably 8-12min, more preferably 9 to 11 minutes, more preferably 10 minutes.

[0048] In the present invention, the mixing preferably includes the following steps: premixing the kerosene, the surfactant and the carrier, and remixing the obtained premixed material with the internal aqueous phase solution.

[0049] In the present invention, the premixing is preferably carried out under stirring conditions; the stirring speed is preferably 300-600rpm, more preferably 350-5...

Embodiment 1

[0077] Take 9mL Span 85, 7mL isoamyl acetate, 44mL kerosene and 60mL sodium sulfide solution with a concentration of 0.2mol / L, and stir at 3000rpm for 10min to obtain a water-in-oil emulsion;

[0078] Mix 2g of the broken circuit board, 20mL of concentrated nitric acid and 20mL of hydrogen peroxide. After the heat release, stir in a water bath at 50°C at a stirring speed of 300rpm for 2h to carry out the digestion reaction. After the reaction is completed, let it stand for cooling and separate After obtaining the supernatant, adjust the pH value of the supernatant to 5 to obtain a solution containing metal ions;

[0079] Take 30mL of water-in-oil emulsion and 50mL of a solution containing metal ions with a mass concentration of 2g / L, stir at 600rpm for 15min; let stand for 2h to separate the layers, and then mix the separated organic phase with 50mL of water , centrifuged at a speed of 6000rpm for 2 minutes, repeated centrifugation twice, and dried the solid obtained by centri...

Embodiment 2

[0081] Take 6mL Span 85, 6mL alkylphosphonic acid, 6mL liquid paraffin, 42mL kerosene and 60mL sodium sulfide solution with a concentration of 0.2mol / L, and stir for 10min at a speed of 3500rpm to obtain a water-in-oil emulsion;

[0082] Mix 2g of the broken circuit board, 20mL of concentrated nitric acid and 20mL of hydrogen peroxide. After the heat release, stir in a water bath at 50°C at a stirring speed of 300rpm for 2h to carry out the digestion reaction. After the reaction is completed, let it stand for cooling and separate After obtaining the supernatant, adjust the pH value of the supernatant to 5 to obtain a solution containing metal ions;

[0083] Take 30mL of water-in-oil emulsion and 60mL of a solution containing metal ions with a mass concentration of 1.5g / L, stir at 600rpm for 15min; let stand for 2h to separate the layers, and then mix the separated organic phase with 50mL of ethanol Finally, centrifugation was carried out at a rotating speed of 6000 rpm for 2 m...

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Abstract

The invention belongs to the technical field of metal recovery, and particularly relates to a water-in-oil emulsion and a preparation method and application thereof. The invention provides a water-in-oil emulsion. The water-in-oil emulsion comprises kerosene, a surfactant, a carrier and an internal water phase solution, the water-in-oil emulsion takes kerosene as an oil phase and takes an inner water phase solution as a water phase; the surfactant comprises a hydrophilic group and an oleophylic group; the hydrophilic group is connected with the internal water phase solution, and the oleophylic group is connected with kerosene; the carrier moves back and forth in the oil phase and the water phase; the carrier comprises isoamyl acetate, alkyl phosphonic acid, dioctyl phosphate or methyl isobutyl ketone; the inner water phase solution comprises a selenide solution and / or a sulfide solution. The water-in-oil emulsion provided by the invention can realize directional recovery of metal.

Description

technical field [0001] The invention belongs to the technical field of metal recovery, and in particular relates to a water-in-oil emulsion and its preparation method and application. Background technique [0002] With the rapid development of the electronic information industry, the performance of electronic products continues to improve, and their update speed is also getting faster and faster. As the lifespan of electronic products is getting shorter and shorter, electronic waste, especially waste circuit boards, is also increasing year by year, becoming one of the sources of electronic waste. The rapid development of electronic information technology has produced a large amount of electronic waste. If it is not handled properly, it will cause great harm to the environment. [0003] The publication number is CN102172597A, which discloses a full-value recovery method of discarded circuit boards, in which metal powder and non-metal powder are obtained by crushing, magnetic...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44
CPCY02P10/20
Inventor 郝泽伟刘璐林梅红莫舒迪
Owner NANKAI UNIV
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