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

The technology of adsorbent and persimmon tannin is applied in the field of preparation and utilization of natural products, which can solve the problems of inconvenient harvesting and many physiological fruit drop, and achieve the effects of convenient industrial production, low production cost and convenient operation.

Inactive Publication Date: 2013-09-25
HUAZHONG AGRI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vast majority of traditional production areas are astringent persimmons, and they are mostly distributed in front of houses, behind houses and on the edge of fields. It is inconvenient to harvest fresh fruits as commodities; moreover, persimmons are easy to flower, and physiological fruit drop is relatively low in the young fruit stage (the period with the highest tannin content). In addition, about 50% of persimmon fruit in my country is usually used to make persimmons, and the resulting discarded persimmon skin accounts for 10% of the weight of fresh fruit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for adsorbing and recovering precious metal palladium by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering precious metal palladium by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering precious metal palladium by persimmon tannin-containing metal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0037] Embodiment 2 utilizes persimmon tannin metal adsorbent to adsorb and reclaim noble metal palladium in palladium-containing mixed solution

[0038] (1) The pH value of the palladium ion mixed solution is adjusted to 5.0-5.5;

[0039] (2) Metal adsorbent and palladium ion mixed solution are joined in the Erlenmeyer flask by metal adsorbent (mg) / solution (ml) mass volume ratio is 1: 3-5;

[0040] (4) Seal the triangular flask with a sealing film, put it into a shaker with a pre-set temperature of 20-50°C and a rotating speed of 100-200rpm for oscillating adsorption; and

[0041] (5) After adsorption for 12-24h, filter, and the palladium ion in the palladium ion mixed solution can be completely adsorbed by the metal adsorbent of the present invention;

[0042] (6) Burning the mixture of the metal adsorbent having adsorbed palladium ions in step (5) with a flame until the impurities in the metal adsorbent are all burnt out to obtain high-purity palladium.

Embodiment 3

[0043] Embodiment 3 Utilizes persimmon tannin metal adsorbent to adsorb and reclaim noble metal palladium in palladium-containing mixed solution

[0044] (1) The pH value of the mixed ion solution (see Table 1) containing the different concentrations of palladium ions is adjusted to 4-6;

[0045] (2) metal adsorbent (mg) / palladium ion mixed solution (ml) mass volume ratio of the present invention is 1: 3-51: 3-5 joins in the Erlenmeyer flask;

[0046] (3) Seal the triangular flask with a sealing film, put it into a shaker with a pre-set temperature of 30-50° C. and a rotating speed of 100-200 rpm, and oscillate for adsorption; and

[0047] (4) after adsorption 12-24h, filter, and palladium ion can be almost completely adsorbed by the metal adsorbent of the present invention when other ion concentrations are very high;

[0048](5) Burning the mixture of the metal adsorbent that has adsorbed palladium ions in step (4) with flame until the impurities in the metal adsorbent are c...

Embodiment 4

[0051] Example 4 Utilize persimmon tannin metal adsorbent to adsorb and recover precious metal palladium in waste mobile phone circuit board solution

[0052] (1) Take 300mL of the waste mobile phone circuit board solution (see Table 2 for ingredients) dissolved in aqua regia and put it into a 500mL beaker (the pH of the waste mobile phone circuit board solution is measured to be 0.8), and use NaOH solution to make the pH of the mixed solution Adjust to 4-6, spare;

[0053] (2) Take 500 mL of deionized water, adjust its pH value to 4-6 with hydrochloric acid solution, and use it as a buffer;

[0054] (3) Take 200mL of the buffer solution of step (2) and soak 11mg of the metal adsorbent prepared by the present invention for 12h;

[0055] (4) Fill the metal adsorbent soaked for 12h into a chromatographic column with an internal diameter of 1cm and a length of 30cm; and

[0056] (5) The flow rate is set to 6mL / h, the sampling time interval is 1h, and the buffer solution of step...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of natural product preparation and especially relates to a method for adsorbing and recovering a precious metal palladium by a persimmon tannin-containing metal adsorbent. The method can be widely used for adsorbing and recovering a palladium element in a secondary resource and has the advantages of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method is characterized by comprising 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 a palladium ion-containing solution having a pH value in an appropriate range into the triangular flask, wherein the volume of the used palladium ion-containing 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 shaking-table shaking adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 25 to 50 DEG C for 12 to 24h or carrying out chromatographic column adsorption at a chromatographic column mobile phase flow rate of 6 to 10mL / h for 12 to 24h, and 4, carrying out filtration so that the palladium ions in the palladium ion-containing solution are adsorbed by the persimmon tannin-containing adsorbent. The method also can be used for adsorbing and recovering a precious metal palladium by a chromatographic column.

Description

technical field [0001] The invention belongs to the technical field of preparation and utilization of natural products, and in particular relates to a method for absorbing and recovering precious metal palladium by using persimmon tannin-containing metals, which can recover palladium in secondary resources. Background technique [0002] With the development of society, countries all over the world demand more and more precious metals, while precious metal mines are decreasing day by day. At the same time, the amount of electronic waste is also increasing year by year, which has huge potential utilization value. The content of precious metals in secondary resources is generally much higher than that of precious metal ores. According to statistics, the content of palladium alone in 1 ton of randomly collected mobile phone casings (excluding plastics) is 0.1kg. Adsorption and recovery of precious metal palladium from secondary resources has the dual effects of saving resources...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30B01D15/08C22B7/00C22B11/00
CPCY02P10/20
Inventor 罗正荣樊在军张青林郭大勇
Owner HUAZHONG AGRI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap