Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent

An adsorbent and persimmon tannin technology, which is applied in the field of natural product utilization, can solve the problems of severe reaction conditions, long preparation time, and increased costs, and achieve the effects of wide sources, convenient operation, and cost savings

Inactive Publication Date: 2013-09-25
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gel not only adsorbs Au(III) in hydrochloric acid medium, but also selectively adsorbs noble metals such as Pd(II) and Pt(IV), but it does not adsorb Cu(II), Zn(II), Fe(III), Ni (II) and other basic metal ions have almost no adsorption
But the above-mentioned method that contains persimmon tannin adsorbent of preparation, or needs to extract persimmon tannin, increases cost, or reaction condition is severe (need to add concentrated sulfuric acid), and preparation time is long

Method used

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  • Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering precious metal gold by persimmon tannin-containing metal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of metal adsorbent

[0038] (1) firstly clean the raw material persimmon fruit or persimmon skin containing persimmon tannin, crush or squeeze the juice, and obtain persimmon powder containing persimmon tannin after vacuum freeze-drying at 40-200Mpa for 10-40h, and set aside;

[0039] (2) Add 0.125-0.25mol / L sodium hydroxide solution to the persimmon tannin-containing persimmon powder obtained in step 1, fully stir and mix, then add 37% formaldehyde solution by v / v, fully stir , to obtain the solid granular adsorbent crude product containing persimmon tannin;

[0040] 3) Put the crude adsorbent product obtained in step 2) in a water bath, the temperature of the water bath is 81°C, and the water bath time is 24h, so that it can fully react; the crude adsorbent product after the reaction is washed once with deionized water, and then washed with 100mL 0.05 Wash once with mol / L dilute nitric acid solution, and finally wash with deionized water repeate...

Embodiment 2

[0041] Example 2 Adsorption and recovery of precious metal gold by persimmon tannin

[0042] (1) The pH value of the mixed solution containing gold ions is adjusted to 2-4;

[0043] (2) Put the metal adsorbent into the Erlenmeyer flask, react with the mixed solution containing gold ions, and seal it with a parafilm; in mg / mL, the mass ratio of the metal adsorbent to the mixed solution containing gold ions 1:3-5, the total volume is less than 1 / 2 of the volume of the Erlenmeyer flask;

[0044](3) The mixture of the metal adsorbent that has adsorbed gold in step (2) is incinerated with a flame until the impurities in the metal adsorbent are completely burned to obtain pure gold, or eluted with 1mol / L eluent thiourea The metal adsorbent mixture that has adsorbed gold for 12-24 hours to obtain a concentrated eluent, and further remove the liquid in the eluent to obtain pure gold;

[0045] in:

[0046] The reaction conditions in the non-metal container are: vibration adsorption,...

Embodiment 3

[0047] Example 3 Adsorption and recovery of precious metal gold by persimmon tannin metal adsorbent

[0048] (1) The pH value of the mixed ion solutions (shown in Table 1) containing gold ions of different concentrations is adjusted to 2;

[0049] (2) The metal adsorbent of embodiment 1 and the gold ion mixed solution of step (1) are added in the Erlenmeyer flask by mg / mL, and the volume ratio of the metal adsorbent mass to the solution is 1: 3-5;

[0050] (3) Seal the triangular flask with a sealing film, put it into a shaker with a preset temperature of 30-50°C and a rotation speed of 100-200rpm, oscillate and adsorb for 24 hours, filter, and the gold ions can be completely adsorbed by the adsorbent;

[0051] (4) The method for further recovering pure gold in the metal adsorbent refers to step (3) of Example 1.

[0052] The initial concentrations of ions in the four adsorption systems of the present invention are shown in Table 1.

[0053] Table 1 Initial concentrations of...

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Abstract

The invention belongs to the technical field of natural product extraction and utilization, and especially relates to a method for adsorbing and recovering a precious metal gold by a persimmon tannin-containing metal adsorbent. The method can be used for selectively adsorbing and recovering a gold element in a secondary resource and has the characteristics of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method comprises the following steps of 1, weighing a certain amount of a persimmon tannin-containing adsorbent, and adding the weighed persimmon tannin-containing adsorbent into a triangular flask, 2, adding an alloy ion-containing mixed solution having a pH value of 2 to 4 into the triangular flask, wherein the volume of the used alloy ion-containing mixed solution is less than or equal to half of the volume of the triangular flask, 3, sealing an opening of the triangular flask by a sealing film, putting the sealed triangular flask into a shaking table, and carrying out adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 25 to 50 DEG C for 12 to 24h, and 4, carrying out filtration so that gold ions in the alloy ion-containing mixed solution are adsorbed by the persimmon tannin-containing adsorbent. The method also can be used for adsorbing and recovering a precious metal gold by a chromatographic column.

Description

technical field [0001] The invention belongs to the technical field of natural product utilization, and in particular relates to a method for using a persimmon tannin metal adsorbent to adsorb and recover precious metal gold, which can effectively absorb and recover gold in secondary resources. Background technique [0002] Persimmon tannin (persimmon tannin or kaki tannin) is a polyphenolic substance that exists in persimmon fruit and makes it taste astringent, which belongs to condensed tannin. Arranged from 2 to 5 polyphenolic compounds (catechin: catechin-3-gallic acid: gallocatechin: gallocatechin-3-gallic acid = 1:1:2:2) The basic units formed in series, the molecular weight is 1.38×10 4 (Matsuo et al., 1978). The multiple ortho phenolic hydroxyl groups contained in persimmon tannin can be used as polyhydric ligands to carry out ligand exchange reactions with metal ions to form network chelates, which are precipitated at different pH values. recycling and reuse. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01D15/08C02F1/28C22B3/24C02F101/20C22B11/00
CPCY02P10/20
Inventor 罗正荣樊在军张青林郭大勇
Owner HUAZHONG AGRI UNIV
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