CN103572047A - Bacteria agitation leaching method for uranium ore - Google Patents
Bacteria agitation leaching method for uranium ore Download PDFInfo
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- CN103572047A CN103572047A CN201310579403.1A CN201310579403A CN103572047A CN 103572047 A CN103572047 A CN 103572047A CN 201310579403 A CN201310579403 A CN 201310579403A CN 103572047 A CN103572047 A CN 103572047A
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Abstract
A bacteria agitation leaching method for a uranium ore belongs to the technical field of biological metallurgy. The method is conducted according to the following steps: (1) inoculating a mixed bacteria solution containing ferrous oxide micro-spirillum, eosino-ferrous oxide thiobacillus and eosino-thiobacillus thiooxidans into a culture medium to prepare a culture solution; (2) regulating the pH value, introducing air and stirring to culture so as to prepare a leaching bacteria solution; (3) adding water into uranium ore powder to prepare an ore pulp, regulating the pH value with sulfuric acid, then adding the ore pulp into the leaching bacteria solution to prepare a leaching mixture solution; (4) regulating the pH value of the leaching mixture solution by using the sulfuric acid, introducing air and stirring to leach. According to the method, the leaching rate of the uranium is remarkably improved, the acid consumption is reduced, and by improving dynamics in the mineral leaching process, the leaching period is shortened, and the leaching rate is increased. The method provided by the invention has the advantages of low production cost, low investment, simple equipment, environment friendliness and the like.
Description
Technical field
The invention belongs to biological metallurgy technical field, particularly a kind of bacterium agitation leaching method of uranium ore.
Background technology
Uranium is the raw material of nuclear power and Nuclear weapons, and the national economic development and national defense construction are had to vital role.Along with the continuous expansion of the mankind to energy demand, nuclear energy, as a kind of green energy resource, has very large development space, especially in China.The principal feature of China's uranium ore resource is, ore type is many and complicated, and middle Low-grade uranium ore is in the majority, mineralising is inhomogeneous, unmanageable uranium ore proportion is larger.In recent years, along with developing rapidly of China's Nuclear Electricity, the imbalance between supply and demand of uranium resources is more outstanding; Conventional acid system leaches owing to there being the problems such as acid consumption is large, and leaching cycle is long, unfriendly to environment, and uranium concentration is low, recovery process complexity, but also needs extra oxygen consumed agent, as sodium chlorate, pyrolusite, can not address this problem far away.Therefore, alleviate uranium resources in China situation in short supply, must conversion thinking, developing a kind of new technology, to process these type of mineral extremely urgent.
Summary of the invention
For existing acid system, leach the above-mentioned defect that uranium ore exists, the invention provides a kind of bacterium agitation leaching method of uranium ore, by to the micro-spirillum of iron protoxide, have a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is cultivated, then under agitation condition, carry out the leaching of uranium mineral, improve the leaching effect of uranium.
The bacterium agitation leaching method of uranium ore of the present invention carries out according to the following steps:
1, by containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:(10 ~ 20 by the volume ratio of mixed bacteria liquid and 9K substratum);
2, with sulphuric acid soln, regulating the pH value of nutrient solution is 1.0 ~ 2.0; In nutrient solution, pass into air and stir and cultivate, air intake is 0.01 ~ 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 600 ~ 1400rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 12 ~ 24h, makes leaching bacterium liquid;
3, the ore pulp that uranium ore stone flour is added to water furnishing weight concentration 40 ~ 50%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 1.0 ~ 2.0, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 20 ~ 35% of mixed solution gross weight;
4, with sulphuric acid soln, regulating the pH value of leaching mixed solution is 1.0 ~ 2.0; In leaching mixed solution, pass into air and stir and leach, air intake is 0.01 ~ 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 600 ~ 1400rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.0 ~ 2.0, and extraction time is 12 ~ 24h.
In above-mentioned uranium ore stone flour, the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 60 ~ 90%, and the weight content of uranium is 0.1 ~ 10%.
Leaching yield >=99% of uranium in aforesaid method.
The concentration of above-mentioned sulphuric acid soln is 1 ~ 2N.
In above-mentioned 9K substratum, the concentration of each composition is (NH
4)
2sO
43 g/L, MgSO
47H
2o 0.5 g/L, KCl 0.1 g/L, Ca(NO
3)
20.01 g/L, K
2hPO
40.5 g/L, FeSO
47H
2o 44.2 g/L.
The mixed bacterium that the ore-leaching bacteria that the present invention adopts is comprised of three kinds of bacteriums, the micro-spirillum of iron protoxide, has a liking for acid oxidase ferrous iron thiobacillus and Acidithiobacillus thiooxidans; It is the energy that these three kinds of bacteriums be take low price iron and reduced sulfur, in the temperature range of 44 ℃ ~ 60 ℃, has good oxidation activity.Method of the present invention can significantly improve the leaching yield of uranium, and reduces acid consumption; By improvement, soak ore deposit process kinetics, shorten leaching cycle, improve leaching yield.Method of the present invention has that production cost is low, less investment, equipment are simple, advantages of environment protection.
Embodiment
The micro-spirillum of iron protoxide adopting in the embodiment of the present invention, have a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is bought in Chinese Typical Representative culture collection center.
The sulfuric acid of preparing sulphuric acid soln employing in the embodiment of the present invention is analytical reagent, and the water of employing is deionized water.
The uranium ore stone flour of selecting in the embodiment of the present invention is that the uranium ore by mining forms after crushed, and the more than 2% uranium ore stone flour of wherein wt content is to pulverize and obtain again after artificial selection.
In the 9K substratum adopting in the embodiment of the present invention, the concentration of each composition is (NH
4)
2sO
43g/L, MgSO
47H
2o 0.5 g/L, KCl 0.1 g/L, Ca(NO
3)
20.01 g/L, K
2hPO
40.5 g/L, FeSO
47H
2o 44.2 g/L.
In the embodiment of the present invention, the equipment of pH value determination and current potential is PHS-2F type acidometer.
When preparation is leached bacterium liquid and leaches in the embodiment of the present invention, adopt with the container stirring, pass through water bath heat preservation.
Embodiment 1
By containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:10 by the volume ratio of mixed bacteria liquid and 9K substratum;
It is 1.0 that the sulphuric acid soln that is 2N by concentration regulates the pH value of nutrient solution; In nutrient solution, pass into air and stir and cultivate, air intake is 0.01m by every liter of nutrient solution
3/ h, stirring velocity is 600rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 24h, makes leaching bacterium liquid;
In the uranium ore stone flour of selecting, the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 90%, and the weight content of uranium is 0.179%;
The ore pulp that uranium ore stone flour is added to water furnishing weight concentration 40%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 1.0, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 20% of mixed solution gross weight;
It is 1.0 ~ 2.0 that the sulphuric acid soln that is 2N by concentration regulates the pH value of leaching mixed solution; In leaching mixed solution, pass into air and stir and leach, air intake is 0.01m by every liter of nutrient solution
3/ h, stirring velocity is 600rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.0, and extraction time is 24h; The leaching yield of uranium is 99.85%;
Under condition of the same race, adopt the mode of sulfuric acid leaching not add bacterium immersion to go out uranium ore of the same race, leaching yield is 62.92%.
Embodiment 2
By containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:15 by the volume ratio of mixed bacteria liquid and 9K substratum;
It is 1.5 that the sulphuric acid soln that is 1N by concentration regulates the pH value of nutrient solution; In nutrient solution, pass into air and stir and cultivate, air intake is 0.02m by every liter of nutrient solution
3/ h, stirring velocity is 1400rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 12h, makes leaching bacterium liquid;
In the uranium ore stone flour of selecting, the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 81%, and the weight content of uranium is 0.382%
The ore pulp that uranium ore stone flour is added to water furnishing weight concentration 50%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 1.5, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 25% of mixed solution gross weight;
It is 1.0 ~ 2.0 that the sulphuric acid soln that is 1N by concentration regulates the pH value of leaching mixed solution; In leaching mixed solution, pass into air and stir and leach, air intake is 0.02m by every liter of nutrient solution
3/ h, stirring velocity is 1400rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.5, and extraction time is 12h; The leaching yield of uranium is 99.37%;
Under condition of the same race, adopt the mode of sulfuric acid leaching not add bacterium immersion to go out uranium ore of the same race, leaching yield is 45.25%.
Embodiment 3
By containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:20 by the volume ratio of mixed bacteria liquid and 9K substratum;
It is 2.0 that the sulphuric acid soln that is 2N by concentration regulates the pH value of nutrient solution; In nutrient solution, pass into air and stir and cultivate, air intake is 0.03m by every liter of nutrient solution
3/ h, stirring velocity is 800rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 16h, makes leaching bacterium liquid;
In the uranium ore stone flour of selecting, the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 60%, and the weight content of uranium is 0.527%
The ore pulp that uranium ore stone flour is added to water furnishing weight concentration 45%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 2.0, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 30% of mixed solution gross weight;
It is 1.0 ~ 2.0 that the sulphuric acid soln that is 2N by concentration regulates the pH value of leaching mixed solution; In leaching mixed solution, pass into air and stir and leach, air intake is 0.03m by every liter of nutrient solution
3/ h, stirring velocity is 800rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 2.0, and extraction time is 16h; The leaching yield of uranium is 99.08%;
Under condition of the same race, adopt the mode of sulfuric acid leaching not add bacterium immersion to go out uranium ore of the same race, leaching yield is 23.34%.
Embodiment 4
By containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:12 by the volume ratio of mixed bacteria liquid and 9K substratum;
It is 1.5 that the sulphuric acid soln that is 1.5N by concentration regulates the pH value of nutrient solution; In nutrient solution, pass into air and stir and cultivate, air intake is 0.015m by every liter of nutrient solution
3/ h, stirring velocity is 1000rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 24h, makes leaching bacterium liquid;
The uranium ore stone flour of selecting is to pulverize and obtain after artificial selection, and the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 75%, and the weight content of uranium is 10%
The ore pulp that uranium ore stone flour is added to water furnishing weight concentration 50%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 1.5, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 35% of mixed solution gross weight;
It is 1.5 that the sulphuric acid soln that is 1.5N by concentration regulates the pH value of leaching mixed solution; In leaching mixed solution, pass into air and stir and leach, air intake is 0.015m by every liter of nutrient solution
3/ h, stirring velocity is 1000rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.0 ~ 2.0, and extraction time is 24h; The leaching yield of uranium is 99.44%;
Under condition of the same race, adopt the mode of sulfuric acid leaching not add bacterium immersion to go out uranium ore of the same race, leaching yield is 20.12%.
Embodiment 5
By containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:18 by the volume ratio of mixed bacteria liquid and 9K substratum;
It is 2.0 that the sulphuric acid soln that is 1N by concentration regulates the pH value of nutrient solution; In nutrient solution, pass into air and stir and cultivate, air intake is 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 1400rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 20h, makes leaching bacterium liquid;
The uranium ore stone flour of selecting is to pulverize and obtain after artificial selection, and the part of granularity≤74 μ m accounts for whole uranium ore stone flour gross weights 90%, and the weight content of uranium is 7.5%
The ore pulp that uranium ore stone flour is added to water furnishing weight concentration 40%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 2.0, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 15% of mixed solution gross weight;
It is 2.0 that the sulphuric acid soln that is 1N by concentration regulates the pH value of leaching mixed solution; In leaching mixed solution, pass into air and stir and leach, air intake is 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 1400rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.0 ~ 2.0, and extraction time is 20h; The leaching yield of uranium is 99.57%;
Under condition of the same race, adopt the mode of sulfuric acid leaching not add bacterium immersion to go out uranium ore of the same race, leaching yield is 29.36%.
Claims (3)
1. a bacterium agitation leaching method for uranium ore, is characterized in that carrying out according to the following steps:
(1) by containing the micro-spirillum of iron protoxide, the mixed bacteria liquid of having a liking for the ferrous thiobacillus of acid oxidase and Acidithiobacillus thiooxidans is inoculated in 9K substratum, makes nutrient solution, inoculum size is 1:(10 ~ 20 by the volume ratio of mixed bacteria liquid and 9K substratum);
(2) with sulphuric acid soln, regulating the pH value of nutrient solution is 1.0 ~ 2.0; In nutrient solution, pass into air and stir and cultivate, air intake is 0.01 ~ 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 600 ~ 1400rpm, and the temperature of controlling nutrient solution is 44 ~ 60 ℃, and the pH value of nutrient solution is 1.0 ~ 2.0, and incubation time is 12 ~ 24h, makes leaching bacterium liquid;
(3) uranium ore stone flour is added to the ore pulp of water furnishing weight concentration 40 ~ 50%, then with sulphuric acid soln, the pH value of ore pulp is adjusted to 1.0 ~ 2.0, then join and leach in bacterium liquid, make leaching mixed solution, uranium ore stone flour accounts for and leaches 20 ~ 35% of mixed solution gross weight;
(4) with sulphuric acid soln, regulating the pH value of leaching mixed solution is 1.0 ~ 2.0; In leaching mixed solution, pass into air and stir and leach, air intake is 0.01 ~ 0.1m by every liter of nutrient solution
3/ h, stirring velocity is 600 ~ 1400rpm, and the temperature that control to leach mixed solution is 44 ~ 60 ℃, and the pH value that leaches mixed solution is 1.0 ~ 2.0, and extraction time is 12 ~ 24h.
2. the bacterium agitation leaching method of a kind of uranium ore according to claim 1, is characterized in that the part of granularity≤74 μ m in described uranium ore stone flour accounts for whole uranium ore stone flour gross weights 60 ~ 90%, and the weight content of uranium is 0.1 ~ 10%.
3. the bacterium agitation leaching method of a kind of uranium ore according to claim 1, is characterized in that leaching yield >=99% of uranium.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2563511C2 (en) * | 2014-05-15 | 2015-09-20 | Виктор Михайлович Курашов | Microbiological method of transmutation of chemical elements and conversion of isotopes of chemical elements |
| CN104046807B (en) * | 2014-06-26 | 2015-12-02 | 东华理工大学 | A kind of pool animalcule leaching uranium method |
| CN105714115A (en) * | 2016-05-09 | 2016-06-29 | 东华理工大学 | Carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method |
| CN107058195A (en) * | 2017-06-15 | 2017-08-18 | 东华理工大学 | One adaptation brannerite stone Leaching Systems composite flora and its application |
| RU2664005C2 (en) * | 2017-08-23 | 2018-08-14 | Виктор Михайлович Курашов | Microbiological method of obtaining chemical elements and their isotopes, including super-heavy transuranic elements |
-
2013
- 2013-11-19 CN CN201310579403.1A patent/CN103572047B/en active Active
Non-Patent Citations (2)
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|---|
| 周仲魁等: ""铀矿石不同酸度下细菌的溶浸试验"", 《有色金属（冶炼部分）》, no. 11, 31 December 2012 (2012-12-31), pages 52 - 55 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2563511C2 (en) * | 2014-05-15 | 2015-09-20 | Виктор Михайлович Курашов | Microbiological method of transmutation of chemical elements and conversion of isotopes of chemical elements |
| CN104046807B (en) * | 2014-06-26 | 2015-12-02 | 东华理工大学 | A kind of pool animalcule leaching uranium method |
| CN105714115A (en) * | 2016-05-09 | 2016-06-29 | 东华理工大学 | Carbonate-siliceous-pelitic-type uranium ore bacterium uranium leaching method |
| CN107058195A (en) * | 2017-06-15 | 2017-08-18 | 东华理工大学 | One adaptation brannerite stone Leaching Systems composite flora and its application |
| CN107058195B (en) * | 2017-06-15 | 2019-12-10 | 东华理工大学 | Composite flora suitable for titanium-uranium ore leaching system and application thereof |
| RU2664005C2 (en) * | 2017-08-23 | 2018-08-14 | Виктор Михайлович Курашов | Microbiological method of obtaining chemical elements and their isotopes, including super-heavy transuranic elements |
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