CN113292063A - Preparation method of environment-friendly biochar - Google Patents
Preparation method of environment-friendly biochar Download PDFInfo
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- CN113292063A CN113292063A CN202110706224.4A CN202110706224A CN113292063A CN 113292063 A CN113292063 A CN 113292063A CN 202110706224 A CN202110706224 A CN 202110706224A CN 113292063 A CN113292063 A CN 113292063A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000004880 explosion Methods 0.000 claims abstract description 57
- 238000000197 pyrolysis Methods 0.000 claims abstract description 45
- 230000004048 modification Effects 0.000 claims abstract description 25
- 238000012986 modification Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 51
- 239000010902 straw Substances 0.000 claims description 22
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- 238000009210 therapy by ultrasound Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 5
- 239000008103 glucose Substances 0.000 claims description 5
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 3
- 239000002689 soil Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000003337 fertilizer Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000002686 phosphate fertilizer Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of environment-friendly biochar, which belongs to the technical field of biochar and comprises the following steps: (1) crushing treatment, (2) steam explosion treatment, (3) modification treatment, and (4) heating pyrolysis treatment. The invention provides a preparation method of environment-friendly biochar, which is simple in overall process, easy to produce and apply in batches, green and environment-friendly, and the prepared biochar is good in physical and chemical properties.
Description
Technical Field
The invention belongs to the technical field of biochar, and particularly relates to a preparation method of environment-friendly biochar.
Background
Straw resources are the most important component of agricultural waste resources. A large amount of straws can be produced in agricultural production activities of China every year, the yield of the straws can reach more than 8 hundred million tons, and field crop straws are taken as main materials. Except for a small part of the fertilizer used for paper making, energy and livestock feeding, the most part of the fertilizer is directly returned to the field for improving soil organic matters and soil. However, a great deal of research finds that the capability of returning straws to fields to promote soil organic carbon is very goodLimited, most of the straws are returned to the field and finally treated with CO through microbial decomposition2The form volatilizes, and the organic carbon content really stored in the farmland soil is very little, greatly reducing the carbon fixation effect of the straw, and limiting the further promotion of the ecological benefit of the farmland system. In addition, under the influence of the traditional farmland management mode, the straw burning phenomenon is still rare in northeast, northwest and northwest areas of China and can not be completely avoided up to now. The straw burning wastes resources and pollutes the atmospheric environment, and becomes one of the important concerns of the current atmospheric pollution prevention and control. Therefore, how to exploit the potential of straw resource utilization and improve the efficiency of straw resource utilization is worth thinking. In addition to low resource utilization of straw, the phenomena of farmland nutrient loss and fertilizer utilization rate reduction caused by unbalanced farmland soil or excessive application of chemical fertilizers become problems commonly faced by the current Chinese agriculture. For example, relevant data show that the utilization rate of nitrogen fertilizer in farmland in China is only 30-40%, and a large amount of nitrogen enters near-surface atmosphere in the form of ammonia gas and nitrogen oxide gas or remains in soil and is leached into underground water in the form of nitrate, so that a series of ecological environment problems are caused. And excessive application of the phosphate fertilizer causes continuous accumulation of the phosphate fertilizer in soil, and when the phosphate in the soil is saturated, leaching loss also exists in the phosphorus which is difficult to leach. The leaching loss of nitrogen and phosphorus not only results in huge loss of fertilizer, but also poses potential threat to the ecological environment. Therefore, the goals of realizing farmland soil recarburization and nitrogen and phosphorus fixation through straw resource utilization are worthy of deep exploration.
The straw biochar returning is a research hotspot in recent years, the stable aromatic structure of the straw biochar returning field not only greatly enhances the stability of the organic carbon in the farmland soil, but also has good fixing effect on quick-acting nitrogen and phosphorus in the soil with high porosity and specific surface area. Biochar, however, refers to a stable carbon-rich solid formed from biomass under anoxic or anaerobic conditions.
Many methods for preparing the biochar exist, but most methods are high in energy consumption and not environment-friendly, and the prepared biochar is poor in quality, so that continuous improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a preparation method of environment-friendly biochar.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of environment-friendly biochar comprises the following steps:
(1) and (3) crushing treatment:
crushing crop straws to obtain crushed materials for later use;
(2) and (3) steam explosion treatment:
putting the crushed material obtained in the step (1) into a steam explosion tank for steam explosion treatment, and taking out the crushed material after the steam explosion treatment to obtain a steam explosion material for later use;
(3) modification treatment:
immersing the steam explosion material obtained in the step (2) into a modification treatment liquid for modification treatment, and taking out the steam explosion material after 40-45 min to obtain a modified material for later use;
(4) heating pyrolysis treatment:
and (4) putting the modified material obtained in the step (3) into a pyrolysis kiln for pyrolysis treatment, and taking out the modified material after the pyrolysis treatment to obtain the finished product biochar.
Further, the particle diameter of the crushed material in the step (1) is not more than 5 cm.
Further, the specific operation of the steam explosion treatment in the step (2) is that high-temperature steam is firstly introduced into the steam explosion tank, meanwhile, the pressure in the steam explosion tank is increased to 1.2-1.5 MPa, and after the heat preservation and pressure maintaining treatment is carried out for 3min, the steam explosion tank is unloaded to normal temperature and normal pressure within 40 s.
Further, the temperature of the high-temperature steam is 105-108 ℃.
Further, the modified treatment liquid in the step (3) is composed of the following substances in parts by weight:
4-8 parts of potassium hydroxide, 10-15 parts of sodium carboxymethylcellulose, 10-15 parts of glucose, 2-5 parts of montmorillonite and 300-400 parts of water.
Further, ultrasonic treatment is also carried out during the modification treatment in the step (3).
Further, the ultrasonic frequency during ultrasonic treatment is 400-500 kHz.
Further, in the step (4), during the pyrolysis treatment, the nitrogen atmosphere in the pyrolysis kiln is controlled, the heating rate is controlled to be 4-6 ℃/min, the temperature in the pyrolysis kiln is maintained to be 480-520 ℃ during pyrolysis, and the pyrolysis time is maintained to be 3-5 h at the temperature.
Compared with the prior art, the invention has the following advantages:
the invention provides a preparation method of environment-friendly biochar, which is simple in overall process and easy to produce and apply in batches, wherein steam explosion treatment is carried out firstly during preparation, so that the fiber structure of crop straws is favorably fully loosened, fiber gaps are enlarged, cellulose and hemicellulose are subjected to degradation treatment to a certain degree, the subsequent carbonization process is favorably carried out, and the subsequent modification treatment is carried out, so that the carbonization conversion rate of the straws and the comprehensive physicochemical properties of finished biochar are remarkably enhanced. The method is green and environment-friendly, and the prepared biochar has good physical and chemical properties, and has great market competitiveness and popularization and application values.
Detailed Description
Example 1
A preparation method of environment-friendly biochar comprises the following steps:
(1) and (3) crushing treatment:
crushing crop straws to obtain crushed materials for later use;
(2) and (3) steam explosion treatment:
putting the crushed material obtained in the step (1) into a steam explosion tank for steam explosion treatment, and taking out the crushed material after the steam explosion treatment to obtain a steam explosion material for later use;
(3) modification treatment:
immersing the steam explosion material obtained in the step (2) into a modification treatment liquid for modification treatment, and taking out the steam explosion material after 40min to obtain a modified material for later use;
(4) heating pyrolysis treatment:
and (4) putting the modified material obtained in the step (3) into a pyrolysis kiln for pyrolysis treatment, and taking out the modified material after the pyrolysis treatment to obtain the finished product biochar.
The particle diameter of the crushed material in the step (1) is not more than 5 cm.
The specific operation of the steam explosion treatment in the step (2) is that high-temperature water vapor is firstly introduced into the steam explosion tank, meanwhile, the pressure in the steam explosion tank is increased to 1.2MPa, and after the heat preservation and pressure maintaining treatment is carried out for 3min, the steam explosion tank is unloaded to normal temperature and normal pressure within 40 s. The temperature of the high temperature steam was 105 ℃.
The modified treatment liquid in the step (3) is composed of the following substances in parts by weight:
4 parts of potassium hydroxide, 10 parts of sodium carboxymethylcellulose, 10 parts of glucose, 2 parts of montmorillonite and 300 parts of water.
Ultrasonic treatment is also carried out during the modification treatment in the step (3); the ultrasonic frequency in the ultrasonic treatment was 400 kHz.
And (4) controlling the nitrogen atmosphere in the pyrolysis kiln during pyrolysis treatment in the step (4), controlling the heating rate of heating to be 4 ℃/min, keeping the temperature in the pyrolysis kiln at 480 ℃ during pyrolysis, and keeping the pyrolysis time at the temperature for 3 h.
Example 2
A preparation method of environment-friendly biochar comprises the following steps:
(1) and (3) crushing treatment:
crushing crop straws to obtain crushed materials for later use;
(2) and (3) steam explosion treatment:
putting the crushed material obtained in the step (1) into a steam explosion tank for steam explosion treatment, and taking out the crushed material after the steam explosion treatment to obtain a steam explosion material for later use;
(3) modification treatment:
immersing the steam explosion material obtained in the step (2) into a modification treatment liquid for modification treatment, and taking out the steam explosion material after 40-45 min to obtain a modified material for later use;
(4) heating pyrolysis treatment:
and (4) putting the modified material obtained in the step (3) into a pyrolysis kiln for pyrolysis treatment, and taking out the modified material after the pyrolysis treatment to obtain the finished product biochar.
The particle diameter of the crushed material in the step (1) is not more than 5 cm.
The specific operation of the steam explosion treatment in the step (2) is that high-temperature water vapor is firstly introduced into the steam explosion tank, meanwhile, the pressure in the steam explosion tank is increased to 1.4MPa, and after the heat preservation and pressure maintaining treatment is carried out for 3min, the steam explosion tank is unloaded to normal temperature and normal pressure within 40 s. The temperature of the high temperature steam was 107 ℃.
The modified treatment liquid in the step (3) is composed of the following substances in parts by weight:
6 parts of potassium hydroxide, 13 parts of sodium carboxymethylcellulose, 12 parts of glucose, 4 parts of montmorillonite and 350 parts of water.
Ultrasonic treatment is also carried out during the modification treatment in the step (3); the ultrasonic frequency at the time of ultrasonic treatment was 460 kHz.
And (4) controlling the nitrogen atmosphere in the pyrolysis kiln during pyrolysis treatment in the step (4), controlling the heating rate of heating to be 5 ℃/min, keeping the temperature in the pyrolysis kiln at 500 ℃ during pyrolysis, and keeping the pyrolysis time at the temperature for 4 h.
Example 3
A preparation method of environment-friendly biochar comprises the following steps:
(1) and (3) crushing treatment:
crushing crop straws to obtain crushed materials for later use;
(2) and (3) steam explosion treatment:
putting the crushed material obtained in the step (1) into a steam explosion tank for steam explosion treatment, and taking out the crushed material after the steam explosion treatment to obtain a steam explosion material for later use;
(3) modification treatment:
immersing the steam explosion material obtained in the step (2) into a modification treatment liquid for modification treatment, and taking out the steam explosion material after 45min to obtain a modified material for later use;
(4) heating pyrolysis treatment:
and (4) putting the modified material obtained in the step (3) into a pyrolysis kiln for pyrolysis treatment, and taking out the modified material after the pyrolysis treatment to obtain the finished product biochar.
The particle diameter of the crushed material in the step (1) is not more than 5 cm.
The specific operation of the steam explosion treatment in the step (2) is that high-temperature water vapor is firstly introduced into the steam explosion tank, meanwhile, the pressure in the steam explosion tank is increased to 1.5MPa, and after the heat preservation and pressure maintaining treatment is carried out for 3min, the steam explosion tank is unloaded to normal temperature and normal pressure within 40 s. The temperature of the high temperature steam was 108 ℃.
The modified treatment liquid in the step (3) is composed of the following substances in parts by weight:
8 parts of potassium hydroxide, 15 parts of sodium carboxymethylcellulose, 15 parts of glucose, 5 parts of montmorillonite and 400 parts of water.
Ultrasonic treatment is also carried out during the modification treatment in the step (3); the ultrasonic frequency in the ultrasonic treatment was 500 kHz.
And (4) controlling the nitrogen atmosphere in the pyrolysis kiln during pyrolysis treatment in the step (4), controlling the heating rate of heating to be 6 ℃/min, keeping the temperature in the pyrolysis kiln at 520 ℃ during pyrolysis, and keeping the pyrolysis time at the temperature for 5 h.
The specific surface area of the biochar prepared by the method is more than 400m2And the comprehensive service performance is strong, and the market competitiveness is very high.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (8)
1. The preparation method of the environment-friendly biochar is characterized by comprising the following steps:
(1) and (3) crushing treatment:
crushing crop straws to obtain crushed materials for later use;
(2) and (3) steam explosion treatment:
putting the crushed material obtained in the step (1) into a steam explosion tank for steam explosion treatment, and taking out the crushed material after the steam explosion treatment to obtain a steam explosion material for later use;
(3) modification treatment:
immersing the steam explosion material obtained in the step (2) into a modification treatment liquid for modification treatment, and taking out the steam explosion material after 40-45 min to obtain a modified material for later use;
(4) heating pyrolysis treatment:
and (4) putting the modified material obtained in the step (3) into a pyrolysis kiln for pyrolysis treatment, and taking out the modified material after the pyrolysis treatment to obtain the finished product biochar.
2. The method for preparing eco-friendly biochar as claimed in claim 1, wherein the particle diameter of the crushed material in step (1) is not more than 5 cm.
3. The method for preparing environment-friendly biochar according to claim 1, wherein the specific operation of the steam explosion treatment in the step (2) is that high-temperature water vapor is introduced into the steam explosion tank, the pressure in the steam explosion tank is increased to 1.2-1.5 MPa, and after the heat preservation and pressure maintaining treatment is carried out for 3min, the steam explosion tank is unloaded to normal temperature and pressure within 40 s.
4. The method for preparing environment-friendly biochar as claimed in claim 3, wherein the temperature of the high-temperature steam is 105-108 ℃.
5. The preparation method of the environment-friendly biochar as claimed in claim 1, wherein the modification treatment solution in the step (3) is composed of the following substances in parts by weight:
4-8 parts of potassium hydroxide, 10-15 parts of sodium carboxymethylcellulose, 10-15 parts of glucose, 2-5 parts of montmorillonite and 300-400 parts of water.
6. The method for preparing environment-friendly biochar as claimed in claim 1, wherein the modification treatment in the step (3) is carried out by ultrasonic treatment.
7. The preparation method of the environment-friendly biochar as claimed in claim 6, wherein the ultrasonic frequency during ultrasonic treatment is 400-500 kHz.
8. The method for preparing environment-friendly biochar as claimed in claim 1, wherein in the step (4), the nitrogen atmosphere is controlled in the pyrolysis kiln, the heating rate is controlled to be 4-6 ℃/min, the temperature in the pyrolysis kiln is kept to be 480-520 ℃ during pyrolysis, and the pyrolysis time is kept to be 3-5 hours at the temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110291705 | 2021-03-18 | ||
| CN2021102917053 | 2021-03-18 |
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| CN113292063A true CN113292063A (en) | 2021-08-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114042435A (en) * | 2021-11-03 | 2022-02-15 | 山东农业工程学院 | Method for preparing biochar by pretreating biomass through steam explosion |
| CN115178235A (en) * | 2022-06-16 | 2022-10-14 | 昆明理工大学 | Method for removing Cr (VI) in water body by high-efficiency adsorption of modified biochar |
| CN115487778A (en) * | 2022-10-13 | 2022-12-20 | 湖南口味王集团有限责任公司 | Biochar and preparation method thereof |
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| CN108313998A (en) * | 2017-12-30 | 2018-07-24 | 安徽大地节能科技有限公司 | A kind of method that agricultural crop straw prepares biological carbon |
| CN112371716A (en) * | 2020-10-18 | 2021-02-19 | 冯家胜 | Heavy metal contaminated soil remediation method and remediation agent thereof |
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2021
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| CN108313998A (en) * | 2017-12-30 | 2018-07-24 | 安徽大地节能科技有限公司 | A kind of method that agricultural crop straw prepares biological carbon |
| CN112371716A (en) * | 2020-10-18 | 2021-02-19 | 冯家胜 | Heavy metal contaminated soil remediation method and remediation agent thereof |
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| Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114042435A (en) * | 2021-11-03 | 2022-02-15 | 山东农业工程学院 | Method for preparing biochar by pretreating biomass through steam explosion |
| CN115178235A (en) * | 2022-06-16 | 2022-10-14 | 昆明理工大学 | Method for removing Cr (VI) in water body by high-efficiency adsorption of modified biochar |
| CN115487778A (en) * | 2022-10-13 | 2022-12-20 | 湖南口味王集团有限责任公司 | Biochar and preparation method thereof |
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