CN112077122A - Method for solidifying iron tailings by inducing solidification effect bacteria - Google Patents
Method for solidifying iron tailings by inducing solidification effect bacteria Download PDFInfo
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- CN112077122A CN112077122A CN202010929028.9A CN202010929028A CN112077122A CN 112077122 A CN112077122 A CN 112077122A CN 202010929028 A CN202010929028 A CN 202010929028A CN 112077122 A CN112077122 A CN 112077122A
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- bacterial liquid
- iron tailings
- actinomyces naeslundii
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
Abstract
The invention relates to the technical field of iron tailing solidification methods, in particular to a method for solidifying iron tailings by bacteria under the induction of solidification, which adopts actinomyces naeslundii to solidify the tailings. The invention discloses the application of the actinomyces naeslundii in iron tailing solidification for the first time, iron tailing particles are solidified into blocks through the biological solidification effect of the actinomyces naeslundii, and after solidification treatment, the iron tailing is blocky, so that the wind power resistance and the compressive strength of the iron tailing are greatly improved, the iron tailing cannot be scattered when meeting strong wind weather, the large-scale environmental pollution is avoided, in addition, the occupation and the damage of the iron tailing to land resources can be obviously reduced, and therefore, the application of the actinomyces naeslundii in iron tailing solidification, especially the application of the iron tailing in dry environment movement and semi-movement, has the ecological protection significance.
Description
Technical Field
The invention relates to the technical field of iron tailing solidification methods, in particular to a method for solidifying iron tailings by bacteria under the action of induced solidification.
Background
China is a large country for mineral resource production, and tailings are generated in the process of mineral resource development. According to the statistical data in 2011, the current stock of the tailings in China is over one billion tons, the tailings are increased at the output rate of about 12 billion tons every year, and the annual output of the tailings in China accounts for over 50 percent of the tailings output all over the world due to huge yield and low utilization rate.
The harm to the surrounding environment caused by improper tailing disposal or disposal measures is mainly shown in the following aspects: firstly, a large amount of tailings are disposed in a stockpiling mode at present, which occupies and destroys a large amount of land resources in China; secondly, most of tailings contain heavy metal ions such As Pb and toxic and harmful chemical substances such As As, and the tailings must contain various chemical agents which can cause environmental pollution and are added in the mineral separation or smelting process, the toxic and harmful substances can flow into nearby rivers and permeate underground along with snow melting, rain showering or tailing water more or less to cause the pollution of the rivers and underground water, the polluted ecological environment in the locality can be recovered for hundreds of years, and some of the polluted ecological environments can not be recovered even temporarily; and thirdly, naturally air-dried tailings have small particle size and light weight, and can be blown to peripheral areas when meeting strong wind, so that the environmental pollution in a wider range is caused. The iron tailing treatment also has the problems.
Disclosure of Invention
The invention provides a method for solidifying iron tailings by bacteria under the induction solidification effect, overcomes the defects of the prior art, and can effectively solve the problem of environmental pollution in the existing iron tailing treatment.
The technical scheme of the invention is realized by the following measures: method for solidifying iron tailings by induced solidification bacteria, wherein the induced solidification bacteria are actinomyces naeslundiiActinomyces naeslundiiThe method comprises the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of 1-10% of urea and the concentration of calcium ions of 0.01-0.40 mol/L for culturing for 5-7 days, and then enriching to obtain bacterial liquid with induced solidification effect, wherein the pH of the bacterial liquid is 3-10, and the density of Actinomyces naeslundii in the bacterial liquid is 104CFU/mL to 108 CFU/mL; secondly, spraying bacterial liquid on the iron according to the proportion of adding 10mL to 100mL of bacterial liquid into every 100 g of iron tailingsAnd (3) putting the iron tailings sprayed with the bacterial liquid in a natural drying environment for culturing for 7 to 15 days, and naturally drying to obtain the solidified iron tailings.
The following is further optimization or/and improvement of the technical scheme of the invention:
before the enrichment of the actinomyces naeslundii in the first step, pretreatment is needed, and the pretreatment is carried out according to the following method: recovering the Actinomyces naeslundii strain in nutrient broth, transferring the recovered Actinomyces naeslundii strain to a nutrient broth, wherein the pH value of the nutrient broth is 3-10, and culturing the culture broth at the temperature of 25 ℃ for 48 hours to obtain an Actinomyces naeslundii bacterial liquid.
The nutrient broth culture medium is a mixture of nutrient broth and rice washing water.
The invention discloses the application of Actinomyces naeslundii in iron tailing solidification for the first time, iron tailing particles are solidified into blocks through the biological solidification effect of the Actinomyces naeslundii, and after solidification treatment, the iron tailing is massive, so that the wind resistance and the compressive strength of the iron tailing are greatly improved, the iron tailing cannot be scraped and scattered when encountering strong wind weather, the large-scale environmental pollution is avoided, meanwhile, the amount of harmful substances such as heavy metal ions in the iron tailing flowing into nearby rivers and permeating into the underground is greatly reduced, the pollution of the iron tailing to the rivers and underground water is obviously reduced, in addition, the occupation and damage of the iron tailing to land resources can be obviously reduced, and therefore, the application of the Actinomyces naeslundii in iron tailing solidification, particularly the application of the iron tailing moving in a dry environment and semi-moving environment, has the ecological protection significance.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described below with reference to the following examples:
example 1: the method for solidifying the iron tailings by the induced solidification bacteria is characterized in that the induced solidification bacteria are actinomyces naeslundiiActinomyces naeslundiiThe method comprises the following steps: firstly, putting actinomyces naeslundii bacterial liquid into urea by mass percent1 to 10 percent of bacteria solution with the concentration of calcium ions of 0.01 to 0.40 mol/L is cultured in a nutrient soup culture medium for 5 to 7 days and then enriched to obtain bacteria solution with the induced solidification function, wherein the pH of the obtained bacteria solution is 3 to 10, and the density of actinomyces naeslundii in the bacteria solution is 104CFU/mL to 108 CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 10mL to 100mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural drying environment for 7 days to 15 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
The iron tailings are subjected to the action of Actinomyces naeslundii to release carbon dioxide and ammonia generated by rapid hydrolysis of urea into an aqueous solution to generate carbonate ions and ammonium ions, calcium ions and the carbonate ions of the iron tailings generate calcium carbonate precipitates, the calcium carbonate precipitates can be bonded with iron tailings particles to achieve the purpose of solidifying the tailings, on the other hand, because the Actinomyces naeslundii is negatively charged, positively charged metal ions can be adsorbed, and the generated calcium carbonate precipitates can also fix heavy metal ions while wrapping bacteria to achieve the purpose of solidifying heavy metals.
The iron tailing particles are solidified into blocks through the biological solidification effect of the Actinomyces naeslundii, and after solidification treatment, the iron tailing is massive, so that the wind resistance and the compressive strength of the iron tailing particles are greatly improved, the iron tailing particles cannot be scattered when the iron tailing particles are in a strong wind weather, and the large-scale environmental pollution is avoided.
After the iron tailings of a certain mine plant in the Aleptai area of Xinjiang are treated by actinomyces naeslundii, a layer of hard shell is formed on the surface layer of the iron tailings, and the obtained iron tailings can resist the wind speed of 10 meters per second to 70 meters per second.
Actinomyces naeslundii; latin name: actinomyces naeslundii; the preservation unit: american mode strain collection center; the preservation number is as follows: ATCC 12104; china agency address: beijing Central plains of China, 11, east China, Tokyo, township, Tokyo, east China; time of purchase: year 2013, 9, 8.
Example 2: before the enrichment of the first step, the actinomyces naeslundii needs to be pretreated according to the following method: recovering the Actinomyces naeslundii strain in nutrient broth, transferring the recovered Actinomyces naeslundii strain to a nutrient broth, wherein the pH value of the nutrient broth is 3-10, and culturing the culture broth at the temperature of 25 ℃ for 48 hours to obtain an Actinomyces naeslundii bacterial liquid.
Example 3: the nutrient broth culture medium is a mixture of nutrient broth and rice washing water.
Example 4: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of 2% of urea and the concentration of calcium ions of 0.01 mol/L, and enriching for 5 days to obtain bacterial liquid with the induced solidification effect, wherein the pH of the bacterial liquid is 5, and the density of Actinomyces naeslundii in the bacterial liquid is 108 CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 10mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 15 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 5: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with 5 mass percent of urea and 0.05 mol/L of calcium ion, culturing for 5 days, and enriching to obtain bacterial liquid with induced solidification effect, wherein the pH of the bacterial liquid is 4, and the density of Actinomyces naeslundii in the bacterial liquid is 105CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 30mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 10 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 6: the method for inducing solidification of the bacteria to solidify the iron tailings comprises the following stepsThe method comprises the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of urea of 10% and the concentration of calcium ions of 0.1 mol/L, culturing for 5 days, and enriching to obtain bacterial liquid with induction solidification effect, wherein the pH of the bacterial liquid is 8, and the density of Actinomyces naeslundii in the bacterial liquid is 107 CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 50mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 8 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 7: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of 2% of urea and the concentration of calcium ions of 0.01 mol/L, and enriching for 6 days to obtain bacterial liquid with the induced solidification effect, wherein the pH of the bacterial liquid is 7, and the density of Actinomyces naeslundii in the bacterial liquid is 104CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 10mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 15 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 8: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of urea of 5% and the concentration of calcium ions of 0.05 mol/L, culturing for 57 days, and enriching to obtain bacterial liquid with the induced solidification effect, wherein the pH of the bacterial liquid is 6, and the density of Actinomyces naeslundii in the bacterial liquid is 107CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 30mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 10 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 9: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percent of urea of 10% and the concentration of calcium ions of 0.10 mol/L for culturing for 5 days, and enriching to obtain the actinomyces naeslundii bacterial liquid with inductionThe bacterial liquid with the solidification guiding function, wherein the pH value of the bacterial liquid is 5, and the density of the actinomyces naeslundii in the bacterial liquid is 108 CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 50mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 8 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 10: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of 2% of urea and the concentration of calcium ions of 0.01 mol/L, and enriching for 7 days to obtain bacterial liquid with the induced solidification effect, wherein the pH of the bacterial liquid is 3, and the density of Actinomyces naeslundii in the bacterial liquid is 104CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 10mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural dry environment for 12 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 11: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with 5 mass percent of urea and 0.05 mol/L of calcium ions for culturing for 6 days, and then enriching to obtain bacterial liquid with induction solidification effect, wherein the pH of the bacterial liquid is 8, and the density of Actinomyces naeslundii in the bacterial liquid is 107CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 30mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural drying environment for 11 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
Example 12: the method for solidifying the iron tailings by the induced solidification bacteria is carried out according to the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of urea of 10% and the concentration of calcium ions of 0.1 mol/L, culturing for 5 days, and enriching to obtain bacterial liquid with induction solidification effect, wherein the pH of the bacterial liquid is 6, and the density of Actinomyces naeslundii in the bacterial liquid is 108 CFU/mL; secondly, adding 50mL of bacterial liquid into every 100 g of iron tailingsSpraying the liquid into the iron tailings, placing the iron tailings sprayed with the bacterial liquid in a natural drying environment for culturing for 7 days, and naturally drying to obtain the solidified iron tailings.
The wind resistance of the cured tailings obtained after treating the iron tailings of a certain mine plant in the Aleptai region of Xinjiang according to the method for inducing the curing of iron tailings by curing bacteria as described in examples 4 to 12 above is shown in Table 1.
As can be seen from table 1, the cured tailings can withstand wind forces of 10 meters per second to 70 meters per second.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (3)
1. A method for inducing solidification of iron tailings by bacteria is characterized in that the bacteria inducing solidification is actinomyces naeslundiiActinomyces naeslundiiThe method comprises the following steps: firstly, putting Actinomyces naeslundii bacterial liquid into a nutrient soup culture medium with the mass percentage of 1-10% of urea and the concentration of calcium ions of 0.01-0.40 mol/L for culturing for 5-7 days, and then enriching to obtain bacterial liquid with induced solidification effect, wherein the pH of the bacterial liquid is 3-10, and the density of Actinomyces naeslundii in the bacterial liquid is 104CFU/mL to 108 CFU/mL; and secondly, spraying the bacterial liquid into the iron tailings according to the proportion of adding 10mL to 100mL of bacterial liquid into every 100 g of the iron tailings, culturing the iron tailings sprayed with the bacterial liquid in a natural drying environment for 7 days to 15 days, and naturally drying the iron tailings to obtain the solidified iron tailings.
2. The method for inducing solidification of bacteria on iron tailings according to claim 1, wherein the actinomyces naeslundii is subjected to pretreatment before the first enrichment step, and the pretreatment is carried out according to the following method: recovering the Actinomyces naeslundii strain in nutrient broth, transferring the recovered Actinomyces naeslundii strain to a nutrient broth, wherein the pH value of the nutrient broth is 3-10, and culturing the culture broth at the temperature of 25 ℃ for 48 hours to obtain an Actinomyces naeslundii bacterial liquid.
3. The method for inducing solidification of iron tailings by using bacteria according to claim 1 or 2, wherein the nutrient broth medium is a mixture of nutrient broth and rice washing water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082759A (en) * | 2021-11-18 | 2022-02-25 | 国网新疆电力有限公司电力科学研究院 | Method for safely disposing fly ash |
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| US4990031A (en) * | 1988-06-09 | 1991-02-05 | Blowes David W | Treatment of mine tailings |
| CN102671908A (en) * | 2011-03-11 | 2012-09-19 | 河北农业大学 | Improvement method for biological environment of tailing pond |
| CN104264658A (en) * | 2014-10-17 | 2015-01-07 | 中国科学院新疆生态与地理研究所 | Novel method for Actinomycesnaeslundii sand stabilization |
| CN107983745A (en) * | 2017-11-24 | 2018-05-04 | 国网新疆电力有限公司电力科学研究院 | Application of the actinomyces naeslundii in cupro-nickel tailing solidifying |
| CN109456770A (en) * | 2018-11-23 | 2019-03-12 | 国网新疆电力有限公司电力科学研究院 | Application of the hydrolysis of urea bacterium of salt tolerant in Pb-Zn tailings solidify |
| CN110576023A (en) * | 2019-07-26 | 2019-12-17 | 国网新疆电力有限公司电力科学研究院 | Application of Actinomyces naeslundii in solidification of copper-molybdenum tailings |
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2020
- 2020-09-07 CN CN202010929028.9A patent/CN112077122A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990031A (en) * | 1988-06-09 | 1991-02-05 | Blowes David W | Treatment of mine tailings |
| CN102671908A (en) * | 2011-03-11 | 2012-09-19 | 河北农业大学 | Improvement method for biological environment of tailing pond |
| CN104264658A (en) * | 2014-10-17 | 2015-01-07 | 中国科学院新疆生态与地理研究所 | Novel method for Actinomycesnaeslundii sand stabilization |
| CN107983745A (en) * | 2017-11-24 | 2018-05-04 | 国网新疆电力有限公司电力科学研究院 | Application of the actinomyces naeslundii in cupro-nickel tailing solidifying |
| CN109456770A (en) * | 2018-11-23 | 2019-03-12 | 国网新疆电力有限公司电力科学研究院 | Application of the hydrolysis of urea bacterium of salt tolerant in Pb-Zn tailings solidify |
| CN110576023A (en) * | 2019-07-26 | 2019-12-17 | 国网新疆电力有限公司电力科学研究院 | Application of Actinomyces naeslundii in solidification of copper-molybdenum tailings |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082759A (en) * | 2021-11-18 | 2022-02-25 | 国网新疆电力有限公司电力科学研究院 | Method for safely disposing fly ash |
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