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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  • 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

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  • Selective separation method of gold ions
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  • Selective separation method of gold ions

Examples

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Example Embodiment

[0059] Example 1

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

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

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

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

Example Embodiment

[0066] Example 2

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

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

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

[0070] (3) Under the protection of n...

Example Embodiment

[0079] Example 3

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

[0081] (1) Take appropriate amounts of gold (III), magnesium (II), copper (II), zinc (II), arsenic (V), cadmium (II) and lead (II) standard solutions, and mix them together, Prepare a mixed solution of pH 5 with various ion concentrations of 90 mg / L, and divide the above-mentioned 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 aliquot of the mixed solution, disperse uniformly by ultrasonic, and then place it in a shaker and oscillate for 2 hours at room temperature. 100r / min, magnetic separation, take the supernatant for ICP-OES detection, and calculate the adsorption amount of various ions.

[0083] (3) Put the magnetic adsorbent recovered after adsorption and separation into a mixed eluent of hydrochloric acid and thiourea (hydrochloric acid 5wt%, thiourea 0.5mol / L), so that the...

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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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