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Strain GX-3 and method for recycling nano gold from gold-ion-bearing wastewater

A nano-gold, GX-3 technology, applied in the field of environmental microorganisms, can solve the problems of high concentration of gold ions in effluent, high cost, and poor recovery effect

Active Publication Date: 2017-07-21
NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI +1
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  • Application Information

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Problems solved by technology

[0003] A large amount of low-concentration gold-containing wastewater will be produced during the smelting and purification of gold mines, waste gold recovery, etc. Although activated carbon adsorption, ion exchange and conventional reducing agent reduction methods are used to recover trace gold ions in the electrolytic waste liquid, However, there are problems of high cost, poor recovery effect, and high concentration of gold ions in the effluent, and the gold loss rate is still considerable when the amount of wastewater discharged is large.

Method used

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  • Strain GX-3 and method for recycling nano gold from gold-ion-bearing wastewater
  • Strain GX-3 and method for recycling nano gold from gold-ion-bearing wastewater
  • Strain GX-3 and method for recycling nano gold from gold-ion-bearing wastewater

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Experimental program
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Effect test

Embodiment 1

[0022] Add the strain GX-3 and gold ion-containing wastewater into the culture solution with a pH value of 5-9, and place it in a shaker at 30°C for culture. The measurement time is 0 hour, 24 hours, 48 ​​hours, 72 hours, and 96 hours. , 120 hours, 144 hours, 168 hours, 192 hours, 216 hours, and 240 hours culture supernatants were collected by centrifugation to collect nano-gold particles, wherein the concentration of gold ions in the wastewater was 160 μM.

Embodiment 2

[0024] The only difference from Example 1 is that in Example 2, the culture solution containing strain GX-3 and wastewater containing gold ions was cultured in a shaker at 25°C.

Embodiment 3

[0026] The only difference from Example 1 is that in Example 3, the culture solution containing the bacterial strain GX-3 and the wastewater containing gold ions was placed in a shaker at 35° C. for cultivation.

[0027] Embodiment 1-3 is different Au under different temperature 3+ The concentration of strain GX-3 on Au 3+ Compared with the recovery rate, the results are as follows: figure 2 shown. The results showed that Au 3+ The order of 216-hour recoveries in different treatments was: 50<120<160 μM. The highest recovery rate reached 78% at the concentration of 160μM.

[0028] Effect of strain GX-3 on Au at different pH values 3+ Recovery rate comparison

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Abstract

The invention relates to strain GX-3, in particular to strain GX-3 for efficiently recycling noble metal ions from wastewater, such as mine wastewater, electronic wastewater, and belongs to the technical field of environmental microorganisms. The strain GX-3 has a taxonomic name, Delftia tsuruhatensis GX-3 and is also a sulfur-reducing bacterium. The strain gauge GX-3 is collected in CGMCC (China General Microbiological Culture Collection Center) under CGMCC No. 13430 on December 07, 2016. Au3+ is added to sulfur-reducing strain GX-3 culture liquid, cell membrane pore protein of the strain GX-3 is reduced directly into Au3+ as elemental Au0; the elemental Au0 is combined with the pore protein to form nano gold particles, and precipitation in the solution is avoided. High-speed centrifugal method is used to separate and collect nano gold particles, and the concentration of residue Au3+ in the solution is detected via ICP-MS analysis.

Description

technical field [0001] The invention relates to a bacterial strain GX-3, in particular to a bacterial strain GX-3 suitable for efficient recovery and utilization of noble metal ions from mine wastewater, electronic waste water and other water, and belongs to the technical field of environmental microorganisms. Background technique [0002] With the development of industry, especially the rapid development of high-tech industries in recent decades, the demand for gold has been increasing, and the world's gold resources have been developed and utilized in large quantities. For the gold mines mined in the past 10 or 20 years, there are fewer and fewer gold mines that are easy to select and leach, while more and more are difficult to select and leach. In order to seek ways to reduce the production cost of refractory gold ore and increase the recovery rate, microbial technology for refractory gold ore treatment received more and more attention in the mid-1980s. [0003] A large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C12P3/00C12R1/38
CPCC12P3/00C12N1/205C12R2001/38
Inventor 鲍鹏李国祥
Owner NINGBO URBAN ENVIRONMENT OBSERVATION & RES STATION NUEORS CHINESE ACADEMY OF SCI
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