Method for rapidly oxidizing Fe<2+> in acid process in-situ leaching uranium mining solution by psychrotolerant and acidophilic bacteria at low temperature

A technology for in-situ leaching of uranium and acidophilic bacteria, which is applied to the field of Fe2+ in the uranium mining solution of the bacterial rapid oxidation acid method, which can solve the problems of reduced oxidation activity of mesophilic bacteria, inability to meet industrial production, and low ambient temperature of the in-situ leaching solution. , to achieve the effect of saving production cost

Inactive Publication Date: 2018-11-30
NANHUA UNIV +1
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  • Description
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  • Application Information

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Problems solved by technology

However, domestic acid leaching uranium mines are mainly concentrated in Xinjiang and Inner Mongolia. The ambient temperature of the in-situ leaching solution is low, and the ambient temperature of the in-situ leaching solution is 5-20°C. The oxidation activity of mesophilic bacteria is significantly reduced in this low-temperature environment, which cannot meet the needs of industrial production. Relevant requirements

Method used

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  • Method for rapidly oxidizing Fe&lt;2+&gt; in acid process in-situ leaching uranium mining solution by psychrotolerant and acidophilic bacteria at low temperature
  • Method for rapidly oxidizing Fe&lt;2+&gt; in acid process in-situ leaching uranium mining solution by psychrotolerant and acidophilic bacteria at low temperature

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Experimental program
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Effect test

Embodiment 1

[0033]Example 1. Low-temperature rapid oxidation of Fe in uranium mining solution by psychrophilic acidophilus in-situ leaching by acid method 2+ The method uses cold-resistant acidophilic thiobacillus as the oxidant, uses bio-ceramsite with strong acid resistance and large specific surface area as the carrier of the bacterial membrane, and uses a moving bed bioreactor to immobilize the bacteria to achieve rapid and continuous oxidation adsorption. Fe in tail fluid 2+ the goal of.

[0034] The specific operation steps are as follows:

[0035] A. Activation of cold-resistant acidophilus bacteria liquid

[0036] Adopt 9K medium as culture medium, wherein, 9K medium composition is: (NH 4 ) 2 SO 4 3000 mg / L, K 2 HPO 4 500mg / L, KCl 100mg / L, MgSO 4 500 mg / L, Ca(NO 3 ) 2 10mg / L.

[0037] First, add 9K medium into the solution preparation tank 1, adjust the pH value to 1, then add the psychroacidophilic thiobacillus liquid into the solution preparation tank 1, inoculate...

Embodiment 2

[0055] Embodiment two, with respect to embodiment one:

[0056] In step A, adjust the pH value of the 9K medium to 2.0, and inoculate at a volume fraction of 25%, the stirring temperature is 20°C, the rotation speed of the agitator 1-2 is 180r / min, and the culture in the container is measured every 8h The reduction potential of the solution, when the reduction potential reaches 550 mV, the activated psychroacidophilus bacterial solution is obtained.

[0057] In the C1 step, the composition of the adsorption tail liquid is: SO 4 2- 10000 mg / L, PO 4 3- 25 mg / L, Cl - 500 mg / L, Fe 2 + 1000 mg / L, ∑Fe 1500 mg / L, Ca 2+ 500 mg / L, Mg 2+ 500 mg / L, NH 4 + 100 mg / L, K + 100mg / L, Na + 500 mg / L, the activated psychroacidophilus liquid and the adsorption tail liquid were inoculated at a volume fraction of 30%.

[0058] In the C2 step, the ventilation rate per hour is 0.5 times of the volume of the carrier regeneration tank 5, and the reduction potential of the culture s...

Embodiment 3

[0062] Embodiment three, with respect to embodiment one:

[0063] In step A, adjust the pH value of the 9K medium to 2.5, and inoculate at a volume fraction of 50%, the stirring temperature is 35°C, the speed of the stirrer 1-2 is 200r / min, and the culture in the container is measured every 10h The reduction potential of the liquid, when the reduction potential reaches 600 mV, the activated cold-resistant acidophilus bacterial liquid is obtained.

[0064] In the C1 step, the composition of the adsorption tail liquid is: SO 4 2- 15000 mg / L, PO 4 3- 50 mg / L, Cl - 1000 mg / L, Fe 2+ 2000 mg / L, ∑Fe 3500 mg / L, Ca 2+ 1000 mg / L, Mg 2+ 1000 mg / L, NH 4 + 200 mg / L, K + 200mg / L, Na + 1000 mg / L, the activated psychroacidophilus liquid and the adsorption tail liquid were inoculated at a volume fraction of 50%.

[0065] In the C2 step, the ventilation rate per hour is 1 time of the volume of the carrier regeneration tank 5, and the reduction potential of the culture solut...

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Abstract

The invention discloses a method for rapidly oxidizing Fe<2+> in an acid process in-situ leaching uranium mining solution by psychrotolerant and acidophilic bacteria at a low temperature. The method is characterized in that psychrotolerant and acidophilic thiobacilli are adopted as an oxidizing agent, a biological ceramsite with high acid resistance and specific surface area is adopted as a film hanging carrier of the thiobacilli, and a moving bed bioreactor is adopted for immobilization culture of the bacteria, thereby achieving the purpose of rapidly and continuously oxidizing Fe<2+> in adsorption tail liquid. The method specifically comprises the operation steps of activation of the psychrotolerant and acidophilic bacterium solution, carrier pretreatment, film hanging, rapid and continuous oxidation and adsorption of Fe<2+>+ in the adsorption tail liquid, and regeneration of ceramsite carriers. The bred psychrotolerant and acidophilic bacteria can still keep oxidization activity ofthe bacteria at a low temperature environment of 5-20 DEG C, and rapidly oxidize ferrous ions. By adopting the adsorption tail liquid as a nutritional ingredient for the bacteria, a culture medium isadopted as a bacterium nutrient substance simply during biological ceramsite film hanging, and any nutrient substance is added in a normal running period, so that the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of bacterial leaching, in particular to a bacterial rapid oxidation acid method for leaching Fe in uranium mining solution in a low-temperature environment. 2+ Methods. Background technique [0002] Biometallurgy is a green and cost-effective metallurgical technology recognized at home and abroad. After long-term basic research and field tests, my country's bacterial leaching of uranium has entered the field industrial test from laboratory tests and expanded tests, and has achieved great results. Big progress. ZL201610018578.9 discloses a "rapid oxidation of Fe 2+ Moving bed bioreactor and rapid oxidation of Fe 2+ method", using Thiobacillus ferrooxidans as an oxidant to convert Fe 2+ converted to Fe 3+ . The bacteria used in this method are mesophilic bacteria, such as A. ferrooxidans, L. ferrooxidans, A. thiooxidans, and their optimum growth temperature is around 28-35°C. However, domestic acid leach...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B60/02C12N1/20C12R1/01
CPCC12N1/20C22B3/18C22B60/0226Y02P10/20
Inventor 王清良胡鄂明李乾陈鹏王红强阳奕汉俆益群李德于长贵李鹏
Owner NANHUA UNIV
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