CN111471859B - Method for leaching uranium from low-grade uranium ore by macro-particle reinforced aspergillus niger - Google Patents
Method for leaching uranium from low-grade uranium ore by macro-particle reinforced aspergillus niger Download PDFInfo
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Abstract
The method for leaching uranium from low-grade uranium ore by macro-particle reinforced aspergillus niger comprises the following steps of firstly, dry crushing and grinding the low-grade uranium ore to be treated, and sieving the low-grade uranium ore with a 140-mesh sieve for later use; preparing a PDA culture medium for Aspergillus niger spore culture and a potato extract powder-glucose culture medium for uranium ore leaching, and inoculating Aspergillus niger spores on the PDA culture medium for culture to prepare Aspergillus niger spore suspension; adding the potato extract powder-glucose culture medium and the spore suspension into an ore leaching container filled with macro particles for constant-temperature shaking culture. And then adding the sterile mineral powder into a potato extract powder-glucose culture medium for leaching, controlling the leaching condition, and carrying out solid-liquid separation on the solution after leaching to calculate the leaching rate. The invention strengthens the leaching of fungi by adding macro particles, can be suitable for leaching various types of uranium ores, copper ores and the like, does not add any chemical reagent in the leaching process, has high leaching efficiency of uranium in the ores compared with Aspergillus niger without adding the macro particles, and has simple process flow, environmental protection and no secondary pollution.
Description
Technical Field
The invention relates to the field of biological ore leaching, in particular to a method for leaching uranium in low-grade uranium ore by macro-particle reinforced aspergillus niger.
Background
With the rapid development of the nuclear industry, the demand of natural uranium is increasing. The uranium ore resources in China are rich, but the resources are not good, and the problems are specifically represented as low ore grade, complex mineralogy and many associated elements, and the problems of large reagent consumption, high cost, environment friendliness and the like in the conventional leaching process.
At present, the following methods are generally used for leaching low-grade uranium ores: (1) chemical enhanced leaching, including adding an oxidant, concentrated acid leaching, mixed acid leaching, acid-base combined leaching and the like, for example, in Chinese patent CN201610424028.7, low-grade uranium ore is soaked in alkali liquor to destroy gangue components, uranium ore after alkali leaching is obtained, and then sulfuric acid is used for stirring and leaching. (2) The physical enhanced leaching is carried out by means of physical means such as pre-roasting, ultrasound, microwave, electric field and the like, for example, in Chinese patent CN201810091633.6, sulfuric acid is used as a leaching agent, and after an external current is applied, uranium is leached by slow stirring. (3) Bioleaching, namely leaching uranium by using bacteria and the like, for example, Chinese patent CN201410290677.3, leaching uranium by using bacteria propagated in vitro, introducing bacterial liquid propagated in an oxidation tank filled with gas, added with sulfuric acid, added with ferrous sulfate and hung with a film into an ore leaching system, and merging 3 working procedures of acidification, bacteria planting and uranium leaching in a pool type uranium leaching way. However, the leaching method of the low-grade uranium ores is based on the traditional chemical process, has high requirements on corrosion resistance of equipment and facilities, generates a large amount of acidic wastewater and poses serious threats to the environment.
The method for leaching uranium by adopting fungi such as aspergillus niger and the like is a green and environment-friendly leaching method, and is used for leaching uranium from uranium minerals by utilizing acidification and complexation mechanisms of organic acids generated by fungal metabolism. Citric acid, oxalic acid, acetic acid, lactic acid, succinic acid, etc. produced by fungal metabolism are weak acids compared to sulfuric acid. For example, chinese patent 201510384753.1 uses aspergillus niger for granulation to extract copper, uranium, gold and other minerals from uranium minerals using organic acids produced by fungal metabolism. However, the composition and content of organic acid generated by fungus metabolism mineral leaching are greatly changed, and an enhanced method is needed to improve the leaching efficiency. Therefore, the development of an enhanced leaching method with simple process, high leaching rate and environmental friendliness is a problem to be solved urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for leaching uranium in low-grade uranium ore by using macro-particle reinforced aspergillus niger, which comprises the following steps: and (3) adding millimeter-sized macro particles in the Aspergillus niger ore leaching process to improve the Aspergillus niger growth and ore leaching environment and improve the leaching rate of uranium.
The technical scheme of the invention is as follows: the method for leaching uranium from low-grade uranium ore by using macro-particle reinforced aspergillus niger comprises the following steps:
A. crushing and grinding of uranium ore
Naturally drying, crushing, uniformly mixing and dividing the low-grade uranium ore to be treated, finely grinding the low-grade uranium ore by using a ball mill to prepare mineral powder, sieving the mineral powder by using a 140-mesh standard sieve, and taking the sieved low-grade uranium ore powder for later use.
B. Preparation of culture Medium
The culture medium comprises a PDA culture medium for culturing Aspergillus niger spores and a potato extract powder-glucose culture medium for leaching uranium ores. The potato extract powder-glucose culture medium is prepared by adding 4g of potato extract powder and 20g of glucose into 1000mL of water. The culture medium is sterilized by high pressure steam at 121 ℃ for 0.5h for standby.
C. Preparation of Aspergillus niger spore suspension
Dipping Aspergillus niger spores by using an inoculating ring, streaking and inoculating on a PDA culture medium, and placing the PDA culture medium dipped with the Aspergillus niger spores in a constant-temperature incubator at 30 ℃ for culturing for 3-5 days; washing mature Aspergillus niger spores on the surface of the PDA culture medium with sterile distilled water, filtering the Aspergillus niger spores with a 0.45-micrometer filter, dripping an improved Nepal counting plate after filtering, counting and diluting to obtain the product with the concentration of 106～109spores/mL spore suspension.
D. Macro-particle reinforced aspergillus niger leaching of uranium
Putting mineral powder into a kraft paper bag, placing macro particles into an ore leaching container, sealing the kraft paper bag with kraft paper, sealing the kraft paper bag and the ore leaching container respectively, then placing the kraft paper bag and the ore leaching container into a high-pressure steam sterilization container at 121 ℃ for 0.5h, adding the cooled potato extract powder-glucose culture medium and spore suspension into the ore leaching container filled with the macro particles in a sterile operation table, then placing the container into a constant-temperature oscillation incubator for 0-3 d, wherein the temperature of the constant-temperature oscillation incubator is 25-35 ℃, and the rotating speed is 150-180 rpm.
Adding sterilized mineral powder into an ore leaching container filled with potato leaching powder-glucose culture medium, spore suspension and macro particles in an aseptic operation table, wherein the concentration of ore pulp is 2% -4%, then placing the ore leaching container into a constant-temperature oscillation incubator, and carrying out constant-temperature oscillation leaching for 2-4 d under the conditions that the temperature is 25-35 ℃ and the rotating speed is 150-180 rpm.
The mass ratio of the mineral powder to the macro-particles is 1: 0.5-2.5.
The macro particles are ceramic particles or glass beads, and the particle size is 0.5-3 mm.
The volume ratio of the spore suspension to the potato extract powder-glucose culture medium is 1: 100.
E. solid-liquid separation
Taking out the ore leaching container from the constant-temperature oscillation incubator, pouring a mixture of mineral powder and macro particles wrapped by mycelia in the ore leaching container into a filtering device for solid-liquid separation, determining the uranium grade of separated tailings by using a titanium trichloride reduction/ammonium vanadate oxidation titration method after the solid-liquid separation, and calculating the leaching rate of uranium in low-grade uranium ore, wherein the leaching rate is calculated as follows: (1-tailing uranium content/raw ore uranium content) × 100% = leaching rate of uranium.
Compared with the prior art, the invention has the following characteristics:
1. the method uses cheap and easily-obtained macro particles, such as glass beads or ceramics, which can be recycled, so that the leaching rate of uranium is improved, and no chemical reagent, such as strong acid, strong oxidant and the like, is added in the leaching process, so that the method has the advantages of simple process flow, low investment, low cost and no environmental pollution.
2. The method can be used for treating low-grade uranium ores, complex intractable uranium ores, uranium tailings, uranium barren rocks and the like which cannot be economically recovered by a traditional method by adding macro particles and coaction of aspergillus niger, and can be used for increasing the resource utilization rate.
3. Compared with the method for leaching uranium by directly adopting aspergillus niger without adding macro particles, the method for leaching uranium by using macro particle reinforced aspergillus niger has the advantages that the leaching rate of uranium can be improved by more than 10 percent to the maximum extent, the recycling rate of uranium is effectively improved, and the environmental friendliness is reduced.
The detailed procedures of the present invention will be further described with reference to the accompanying drawings and detailed description.
Drawings
FIG. 1 is a graph showing the effect of adding no or different types of macro particles on the leaching rate of uranium;
FIG. 2 is a graph showing the influence of no or no glass beads of different particle sizes on the leaching rate of uranium;
FIG. 3 is a graph showing the effect of adding no ceramic particles or different ore powder/ceramic particle mass ratios on the uranium leaching rate;
FIG. 4 is a graph showing the influence of different ore slurry concentrations on the leaching rate of uranium;
FIG. 5 is a graph showing the influence of different constant-temperature shaking incubator rotating speeds on the uranium leaching rate.
Detailed Description
The invention is further illustrated by the following examples, however the scope of the invention is not limited to the following examples, which all take the example of a low grade carbon silicalite type uranium ore with a grade of 0.075%.
In a first embodiment, a method for leaching uranium from low-grade uranium ore by using macro-particle reinforced aspergillus niger comprises the following steps:
A. crushing and grinding of uranium ore
Naturally drying, crushing, uniformly mixing and dividing the low-grade uranium ore to be treated, finely grinding the low-grade uranium ore by using a ball mill to prepare mineral powder, sieving the mineral powder by using a 140-mesh standard sieve, and taking the sieved low-grade uranium ore powder for later use.
B. Preparation of culture Medium
The culture medium comprises a PDA culture medium for culturing Aspergillus niger spores and a potato extract powder-glucose culture medium for leaching uranium ores.
The potato extract powder-glucose culture medium is prepared by adding 4g of potato extract powder and 20g of glucose into 1000mL of water, and sterilizing the mixture for 0.5h at 121 ℃ by high-pressure steam for later use.
C. Preparation of Aspergillus niger spore suspension
Dipping Aspergillus niger spores by using an inoculating ring, streaking and inoculating on a PDA culture medium, and placing the PDA culture medium dipped with the Aspergillus niger spores in a constant-temperature incubator at 30 ℃ for culturing for 4 days; washing mature Aspergillus niger spores on the surface of the PDA culture medium with sterile distilled water, filtering the Aspergillus niger spores with a 0.45-micrometer filter, dripping an improved Nepal counting plate after filtering, counting and diluting to obtain the product with the concentration of 108spores/mLThe spore suspension of (1).
D. Macro-particle reinforced aspergillus niger leaching of uranium
Putting mineral powder into kraft paper bags, placing macro-particles into an ore leaching container, sealing the kraft paper bags with kraft paper, respectively sealing the kraft paper bags and the ore leaching container, placing the kraft paper bags and the ore leaching container into an ore leaching container with the macro-particles after being sterilized by high-pressure steam at 121 ℃ for 0.5h, adding the cooled potato extract powder-glucose culture medium and spore suspension into an aseptic operation table, and then placing the container into a constant-temperature oscillation incubator for 2d at the temperature of 30 ℃ and the rotation speed of 150 pm.
Adding the sterilized mineral powder into an ore leaching container filled with potato extract powder-glucose culture medium, spore suspension and macro-particles in an aseptic operation table, wherein the concentration of ore pulp is 2%, then placing the ore leaching container into a constant-temperature oscillation incubator, and carrying out constant-temperature oscillation leaching for 4d under the conditions that the temperature is 30 ℃ and the rotating speed is 150 rpm.
The mass ratio of the mineral powder to the macro-particles is 1: 1.
The macro particles are glass beads, and the particle size is 0.5 mm.
The volume ratio of the spore suspension to the potato extract powder-glucose culture medium is 1: 100.
E. solid-liquid separation
Taking out the ore leaching container from the constant-temperature oscillation incubator, pouring a mixture of mineral powder and macro particles wrapped by mycelia in the ore leaching container into a filtering device for solid-liquid separation, determining the uranium grade of separated tailings by using a titanium trichloride reduction/ammonium vanadate oxidation titration method after the solid-liquid separation, and calculating the leaching rate of uranium in low-grade uranium ore, wherein the leaching rate is calculated as follows: (1-tailing uranium content/raw ore uranium content) × 100% = leaching rate of uranium.
The second embodiment is basically the same as the first embodiment, except that: in step D, the glass beads are replaced with ceramic particles.
And (4) comparing the results:
the results of the calculation of the leaching rates of uranium without adding or adding different types of macro-particles, without adding or adding macro-particles of different particle sizes, without adding ceramic particles or with adding different mass ratios of mineral powder/ceramic particles, with different ore pulp concentrations and with different rotation speeds of the constant temperature shaking incubator are shown in fig. 1 to 5.
a. Calculating the leaching rate of uranium when no macro particles of different types are added or added: the grade of the uranium ore to be treated is 0.075%, the temperature of a constant-temperature oscillation incubator is 30 ℃, the rotating speed is 150rpm, the concentration of ore pulp is 2%, macro particles are not added into a culture medium, macro particles with the particle size of 1mm are added, the mass ratio of the ore powder to the macro particles is 1:1, and the macro particles are glass beads or ceramic particles. And filtering and separating after leaching for 3d, determining the uranium grade of the separated tailings by using an ammonium vanadate titration method, and calculating the leaching rate of uranium in low-grade uranium ore, wherein other leaching parameters are the same as those in the first embodiment or the second embodiment. The results showed that the leaching rates of uranium were 64.91%, 76.40%, and 73.24%, respectively.
Fig. 1 shows a graph of the effect of adding no or different types of macro particles on the leaching rate of uranium. As seen from FIG. 1, in Aspergillus niger containing glass beads or ceramic particles in the medium, the leaching rates of uranium were increased by 11.49% and 8.33%, respectively, compared to Aspergillus niger containing no macro-particles. Therefore, the leaching rate of uranium is obviously improved compared with the experimental group without the macro particles no matter the glass beads or the ceramic particles are added.
b. Calculating the leaching rate of uranium when glass beads with different particle sizes are not added or added: the grade of the uranium ore to be treated is 0.075%, the temperature of the constant-temperature oscillation incubator is 30 ℃, the rotating speed is 180rpm, the concentration of ore pulp is 4%, macro particles are not added into the culture medium or glass beads with the particle sizes of 0.5mm, 1mm, 2mm and 3mm are added into the culture medium, and the mass ratio of the mineral powder to the glass beads is 1:1, filtering and separating after leaching for 4d, determining the uranium grade of the separated tailings by using an ammonium vanadate titration method, and calculating the leaching rate of uranium in low-grade uranium ore, wherein other leaching parameters are the same as those in the first embodiment. The results showed that the leaching rates of uranium were 65.67%, 75.49%, 74.34%, 66.49%, and 67.10%, respectively.
Fig. 2 shows a graph of the effect of adding or not adding glass beads of different particle sizes on the leaching rate of uranium. As seen from FIG. 2, the leaching rates of uranium are respectively improved by 9.82%, 8.67%, 0.82% and 1.43% for Aspergillus niger with glass beads of 0.5mm, 1mm, 2mm and 3mm in particle size; and the leaching rate of uranium is higher when the diameter of the glass bead is smaller, and the leaching rate of uranium is not greatly different when the diameter of the glass bead is larger.
c. Calculating the leaching rate of uranium without adding ceramic particles or adding different mineral powder/ceramic particle mass ratios: the grade of the uranium ore to be treated is 0.075%, the temperature of a constant-temperature oscillation incubator is 30 ℃, the rotating speed is 150rpm, the concentration of ore pulp is 2%, no ceramic particles or ceramic particles with the particle size of 1mm are added into a culture medium, the mass ratio of the ore powder to the ceramic particles is 1:1, 1:2.5 and 1:4 respectively, the ore powder and the ceramic particles are filtered and separated after being leached for 4 days, the uranium grade of the separated tailings is determined by using an ammonium vanadate titration method, the leaching rate of uranium in the low-grade uranium ore is calculated, and other leaching parameters are the same as those in the embodiment. The results showed that the leaching rates of uranium were 64.92%, 70.12%, 71.11%, and 61.33%, respectively.
The effect of the ratio of uranium leaching without addition of ceramic particles or with addition of different ore fines/ceramic particles is shown in fig. 3. As shown in fig. 3, when the mass ratios of the mineral powder to the ceramic particles are 1:1 and 1:2.5, respectively, the leaching rate is increased by 5.2% and 6.19% compared to that obtained without adding the ceramic particles, and when the mass ratio of the mineral powder to the ceramic particles is 1:4, the leaching rate is decreased by 3.59% compared to that obtained without adding the ceramic particles. Therefore, as the ratio of the mineral powder to the ceramic particles is gradually increased, the leaching rate of uranium by aspergillus niger added into the ceramic particles is gradually increased, and the leaching rate of uranium is reduced when the mineral powder is larger than the ceramic particles.
d. Calculating the leaching rate of uranium according to different ore pulp concentrations: the grade of the uranium ore to be treated is 0.075%, the temperature of a constant-temperature oscillation incubator is 30 ℃, the rotating speed is 180rpm, no glass beads or glass beads with the particle size of 1mm are added into a culture medium, the ratio of the mineral powder to the glass beads is 1:1, when the ore pulp concentration of the uranium ore is 2% and 4%, the uranium ore is leached for 4d and then is filtered and separated, the uranium grade of the separated tailings is measured by an ammonium vanadate titration method, the leaching rate of uranium in the low-grade uranium ore is calculated, and other leaching parameters are the same as those in the first embodiment. The result shows that when the concentration of the uranium ore pulp is 2%, the leaching rates of the aspergillus niger to uranium without adding glass beads and without adding glass beads in the culture medium are 67.42% and 76.04% respectively; when the concentration of the uranium ore pulp is 4%, the leaching rates of the aspergillus niger to uranium without glass beads and with glass beads in the culture medium are 65.87% and 73.1% respectively.
Figure 4 shows a graph of the effect of different pulp concentrations on the leaching rate of uranium. As shown in fig. 4, when the ore pulp concentration of uranium ore is 2% and 4%, the leaching rate of uranium is improved by 8.62% and 7.23% compared with aspergillus niger without glass beads when glass beads are added into the culture medium. Therefore, the aspergillus niger added with the glass beads under different ore pulp concentrations has obvious improvement effect on the leaching rate of uranium.
e. Calculating the leaching rate of uranium at different constant-temperature shaking incubator rotating speeds: the grade of the uranium ore to be treated is 0.075%, no glass beads or glass beads with the diameter of 1mm are added into a culture medium, the mass ratio of mineral powder to the glass beads is 1:0.5, the concentration of ore pulp is 4%, the temperature of a constant-temperature oscillation incubator is 30 ℃, the rotating speed is 150rpm, 180rpm and 210rpm respectively, the uranium grade of separated tailings is measured by using an ammonium vanadate titration method after leaching for 4d, the leaching rate of uranium in the low-grade uranium ore is calculated, and other leaching parameters are the same as those in the first embodiment. The results showed that the leaching rates of uranium were 68.87%, 65.06%, 74.89%, 66.15%, 64.78%, and 65.36% with or without glass beads when the rotation speeds of the incubator were 150rpm, 180rpm, and 210rpm, respectively.
FIG. 5 shows a graph of the effect of different incubator speeds on uranium leaching rates. As seen from FIG. 5, the leaching rates of uranium increased by 3.81% and 8.74% when the incubator was operated at 150rpm or 180rpm, compared to that when uranium was not added to the glass beads, and decreased by 0.58% when the incubator was operated at 210 rpm. Therefore, the leaching rate influence effect of different constant-temperature oscillation incubators on uranium is different, and the leaching rate of uranium is highest when the constant-temperature oscillation incubators rotate at 180 rpm.
By calculating the leaching rate of the low-grade uranium ore, the leaching rate of the macro-particle reinforced aspergillus niger on uranium is related to the type and the particle size of macro-particles, the mass ratio of mineral powder to the macro-particles, the ore pulp concentration of the uranium ore and the rotating speed of a constant-temperature oscillation incubator, and when 0.5mm glass beads are selected as the macro-particles, the leaching rate of uranium in the low-grade uranium ore is the highest when the low-grade uranium ore is leached in the constant-temperature oscillation incubator at the temperature of 30 ℃ and the rotating speed of the constant-temperature oscillation incubator of 180rpm according to the proportion of the mineral powder to the glass beads of 1:1 and the ore pulp concentration of 2%.
The above are only some embodiments of the present invention, and various modifications and changes can be made thereto by those skilled in the art based on the above-described concept of the present invention. For example, the material and shape, particle size, added mass, etc. of macro particles are changed, leaching conditions are changed, or other heavy metals are leached by the test method provided by the invention patent. However, such similar changes and modifications are also within the spirit of the present invention.
Claims (1)
1. The method for leaching uranium from low-grade uranium ores by macro-particle reinforced aspergillus niger is characterized by comprising the following steps: the method comprises the following steps:
A. crushing and grinding of uranium ore
Naturally drying, crushing, uniformly mixing and condensing the low-grade uranium ore to be treated, finely grinding the low-grade uranium ore by using a ball mill to prepare mineral powder, sieving the mineral powder by using a 140-mesh standard sieve, and taking the undersize low-grade uranium ore powder for later use;
B. preparation of culture Medium
The culture medium comprises a PDA culture medium for Aspergillus niger spore culture and a potato extract powder-glucose culture medium for uranium ore leaching, and the potato extract powder-glucose culture medium is prepared by adding 4g of potato extract powder and 20g of glucose into 1000mL of water; sterilizing the culture medium at 121 deg.C under high pressure steam for 0.5 h;
C. preparation of Aspergillus niger spore suspension
Dipping Aspergillus niger spores by using an inoculating ring, streaking and inoculating on a PDA culture medium, and placing the PDA culture medium dipped with the Aspergillus niger spores in a constant-temperature incubator at 30 ℃ for culturing for 3-5 days; washing mature Aspergillus niger spores on the surface of the PDA culture medium with sterile distilled water, filtering the Aspergillus niger spores with a 0.45-micrometer filter, dripping an improved Nepal counting plate for counting and diluting to obtain a concentrated solutionDegree of 106～109spores/mL spore suspension;
D. macro-particle reinforced aspergillus niger leaching of uranium
Putting mineral powder into kraft paper bags, placing macro particles into an ore leaching container, sealing the kraft paper bags with kraft paper, sealing the kraft paper bags and the ore leaching container respectively, then placing the kraft paper bags and the ore leaching container into a high-pressure steam sterilization container at 121 ℃ for 0.5h, adding the cooled potato extract powder-glucose culture medium and spore suspension into the ore leaching container filled with the macro particles in an aseptic operation platform, then placing the container into a constant-temperature oscillation incubator for 0-3 d, wherein the temperature of the constant-temperature oscillation incubator is 25-35 ℃, and the rotating speed is 150-180 rpm;
adding sterilized mineral powder into an ore leaching container filled with potato leaching powder-glucose culture medium, spore suspension and macro particles in an aseptic operation table, wherein the concentration of ore pulp is 2% -4%, then placing the ore leaching container into a constant-temperature oscillation incubator, and carrying out constant-temperature oscillation leaching for 2-4 d at the temperature of 25-35 ℃ and the rotating speed of 150-180 rpm;
the mass ratio of the mineral powder to the macro-particles is 1: 0.5-2.5;
the macro particles are ceramic particles or glass beads, and the particle size is 0.5-3 mm;
the volume ratio of the spore suspension to the potato extract powder-glucose culture medium is 1: 100, respectively;
E. solid-liquid separation
Taking out the ore leaching container from the constant-temperature oscillation incubator, pouring a mixture of mineral powder and macro particles wrapped by mycelia in the ore leaching container into a filtering device for solid-liquid separation, determining the uranium grade of separated tailings by using a titanium trichloride reduction/ammonium vanadate oxidation titration method after the solid-liquid separation, and calculating the leaching rate of uranium in low-grade uranium ore, wherein the leaching rate is calculated as follows: (1-tailing uranium content/raw ore uranium content) × 100% = leaching rate of uranium.
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| AU716911B2 (en) * | 1995-06-02 | 2000-03-09 | Geobiotics, Inc. | Method of biotreatment for solid materials in a nonstirred surface bioreactor |
| KR20040062748A (en) * | 2003-01-03 | 2004-07-09 | 주식회사 엔지뱅크 | A preperation method of catalase for wastewater treatment |
| CN101574642A (en) * | 2009-06-09 | 2009-11-11 | 厦门大学 | Preparation method of biological sorbent used for treating phthalocyanines dye waste water |
| CN103276079A (en) * | 2013-05-27 | 2013-09-04 | 江南大学 | Method for detecting adsorbed-state microorganism in chalcopyrite biological leaching process |
| CN104261564A (en) * | 2014-10-14 | 2015-01-07 | 南华大学 | Method for repairing low-concentration uranium polluted water by utilizing syngonium podophyllum-aspergillus niger symbiotic system |
| CN104671437A (en) * | 2015-03-03 | 2015-06-03 | 南华大学 | Method for remedying U (VI) polluted water body by decomposing ground phosphate rock with Aspergillus niger |
| CN107897766A (en) * | 2017-11-22 | 2018-04-13 | 江南大学 | One kind is relieved the effect of alcohol compound preparation and preparation method thereof |
| CN108285981A (en) * | 2018-02-09 | 2018-07-17 | 南华大学 | A kind of burned-coal fly ash puies forward uranium method |
| CN109046271A (en) * | 2018-09-13 | 2018-12-21 | 哈尔滨工业大学 | A kind of preparation method of the water treatment absorbent based on composite biomass sill |
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