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Selective separation method of gold ions

A separation method and technology for gold ions, applied in chemical instruments and methods, alkali metal compounds, improvement of process efficiency, etc., can solve the problems of cumbersome synthesis steps of adsorbent materials, poor acid resistance, incomplete conductive polymers, etc.

Active Publication Date: 2016-12-21
蚌埠弘景科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of coupled chemical reactions to chemically modify the surface of the adsorbent has the following disadvantages: the coupling chemical reaction takes a long time, and the synthesis steps of the adsorbent materials are cumbersome.
[0006] CN104324706A synthesized a class of conductive polymer-based magnetic nanocomposites (Fe 3 o 4 / PANI and Fe 3 o 4 / PPy), and use it for the selective adsorption of silver ions; however, the acid resistance of this type of magnetic nanocomposites is poor, which may be caused by the incomplete coating of the magnetic core by the conductive polymer, which limits the Application of this kind of magnetic nanocomposite in acidic solution

Method used

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Examples

Experimental program
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Embodiment 1

[0060] a kind of Fe 3 o 4 / SiO 2 The preparation method of / cPPyTh magnetic nanocomposite, the steps are as follows:

[0061] (1) Under the protection of nitrogen, add 9mmol ferric chloride hexahydrate, 5mmol ferrous sulfate heptahydrate and 120mL distilled water into a 250mL four-necked bottle, stir and dissolve at room temperature, raise the temperature of the solution to 50°C, and then add 3.3mL Concentrated ammonia water (28wt%), after the addition, the temperature of the solution was raised to 80°C, stirred for 1 hour, and cooled to room temperature to obtain solution A;

[0062] (2) Add 1.7mL tetraethyl orthosilicate to solution A, stir at room temperature for 4 hours; magnetically separate, keep the solid, wash the solid repeatedly with distilled water until the supernatant is neutral, magnetically separate, keep the solid, and place the solid in Dry in a vacuum oven at 40°C for 6 hours to obtain Fe 3 o 4 / SiO 2 ;

[0063] (3) Under nitrogen protection, add 0.6g ...

Embodiment 2

[0067] a kind of Fe 3 o 4 / SiO 2 The preparation method of / cPPyTh magnetic nanocomposite, the steps are as follows:

[0068] (1) Under nitrogen protection, add 10mmol ferric nitrate nonahydrate, 5mmol ferrous sulfate heptahydrate and 67mL distilled water into a 250mL four-necked bottle, stir and dissolve at room temperature, raise the solution temperature to 60°C, then add 5mL concentrated ammonia water ( 28wt%), after the addition, the temperature of the solution was raised to 90°C, stirred for 0.5h, and cooled to room temperature to obtain solution A;

[0069] (2) Add 1.9mL methyl orthosilicate to solution A, stir at room temperature for 2 hours; magnetically separate, keep the solid, wash the solid repeatedly with distilled water until the supernatant is neutral, magnetically separate, keep the solid, and place the solid in Dry in a vacuum oven at 60°C for 4 hours to obtain Fe 3 o 4 / SiO 2 ;

[0070] (3) Under nitrogen protection, add 0.6g Fe to a 250mL four-necked ...

Embodiment 3

[0080] A magnetic nanocomposite is used for the selective separation of gold ions, the steps are as follows:

[0081] (1) Take an appropriate amount of standard solutions of gold (III), magnesium (II), copper (II), zinc (II), arsenic (V), cadmium (II) and lead (II) respectively, mix them together, Prepare a mixed solution with a pH of 5 whose ion concentration is 90 mg / L, and divide the above mixed solution into 10 mL aliquots.

[0082] (2) Add 1, 2, 4, 8, 12, and 16 mg of magnetic nanocomposite sample S-1 to each equal portion of the mixed solution, and disperse evenly with ultrasonic waves, then place it in an oscillator and oscillate at room temperature for 2 hours. 100r / min, magnetic separation, the supernatant was taken for ICP-OES detection, and the adsorption amount of various ions was calculated.

[0083] (3) The magnetic adsorbent recovered after the adsorption separation is respectively placed in the mixed eluent of hydrochloric acid-thiourea (hydrochloric acid 5wt%...

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Abstract

Belonging to the field of wet metallurgy, the invention provides a selective separation method of gold ions. The method includes: adding Fe3O4 / SiO2 / cPPyTh magnetic nano compound into an aqueous solution containing gold ions, fully stirring the substances at room temperature, and conducting magnetic separation to obtain a gold ion adsorbing magnetic nano compound; and then adding the obtained gold ion adsorbing magnetic nano compound into a mixed solution of thiourea and hydrochloric acid, performing stirring at room temperature, and eluting the gold ions adsorbed on the surface of the magnetic nano compound. The unit equilibrium adsorption capacity is high to 816.3mg / g; the separation efficiency is high, the adsorption capacity within 5min is up to 496.7mg / g; adsorption of gold ions can be carried out spontaneously at room temperature; under the condition of coexistence of a variety of interfering ions (Mg<2+>, Cu<2+>, Zn<2+>, As<5+>, Cd<2+> and Pb<2+>), relative to each interfering ion, the average adsorption selectivity of Fe3O4 / SiO2 / cPPyTh to gold ions is higher than 4; the reusability is good, and after continuous use for 5 times, the adsorption / recovery rate of gold ions reaches 93.3% / 92.3%.

Description

technical field [0001] The invention relates to a selective separation method of gold ions, in particular to a selective separation of gold ions by a magnetic nanocomposite, and belongs to the field of hydrometallurgy. Background technique [0002] As one of the precious metals, gold is widely used in the fields of catalysis, electronics, sensing, lithium battery and medicine (Chem.Soc.Rev.41(2012)2740–2779.); however, in the application process of gold, the Gold species leaked into the environment in the form of ions will not only cause a waste of gold resources, but also pose a threat to human health (Biochem. Biophys. Res. Commun. 397 (2010) 226–231.). In order to recover gold species from gold-bearing industrial wastewater, electronic waste, and metallurgical materials, various methods have been developed, such as liquid-liquid extraction, membrane separation, reduction-precipitation, ion exchange, and solid-phase extraction ( J. Mater. Chem. A3 (2015) 1666–1674.). Amo...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/32C22B3/24C22B11/00
CPCB01J20/06B01J20/103B01J20/264B01J20/28009B01J20/3212B01J20/3234C22B3/22C22B11/04Y02P10/20
Inventor 班青盖利刚
Owner 蚌埠弘景科技有限公司
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