CN103804076B - Method for separating humic acid in pH mode and application thereof - Google Patents
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- CN103804076B CN103804076B CN201410026137.4A CN201410026137A CN103804076B CN 103804076 B CN103804076 B CN 103804076B CN 201410026137 A CN201410026137 A CN 201410026137A CN 103804076 B CN103804076 B CN 103804076B
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Abstract
The invention relates to a method for separating humic acid in a pH mode and application thereof. The method comprises the following steps: extracting water-soluble humic acid, separating the water-soluble humic acid in a pH mode, and separating a precipitate L of the humic acid in the pH mode. According to the method, the distribution of the humic acid in different pH ranges can be determined, the method is an activation method for researching the structural characteristics and extraction rate of the humic acid, and method support can be provided for influence on the crop growth and fertilizer release and conversion and depth development and high-efficiency utilization of the humic acid according to the humic acid in various pH ranges.
Description
[technical field]
The invention belongs to chemical fertilizer auxiliary agent technical field.More specifically, the present invention relates to a kind of method being separated humic acids in pH mode, also relate to the purposes of described method.
[background technology]
The chemical fertilizer utilization ratio of China is general lower, nitrogenous fertilizer average utilization about 30%, phosphate fertilizer this season utilization ratio about 25%, potassium utilization rate about 50%.Fertilizer scientific worker has carried out large quantity research to improving the methods of utilization rate of fertilizer, achieves certain effect, but still there is production technique for fertilizer complexity, cost is high, use is inconvenient, be difficult to problems such as applying on field crop.In recent years, how under the condition of low cost input, technology upgrading to be carried out to the fertilizer industry of China and be transformed into study hotspot.In the past few decades, China is to fertilizer, and particularly the research of nitrogen fertilizer potentiating agent is more.These researchs concentrate on the investigation and application of the chemicals such as urease inhibitor and nitrification inhibitor mostly, for crude substance and the applied research of modified natural materials on fertile auxiliary agent less, humic acids is the important source material of exploitation Natural fertilizers auxiliary agent.
Humic acids not only can improve soil, or good urease inhibitor and nitrification inhibitor, and in urea, add this material can significantly improve fertilizer efficiency, extends the retention time of blood urea nitrogen in soil, can yet be regarded as a kind of effective slow releasing agent of urea and synergistic agent.Humic acids can also activate by the phosphorus of soil fixing, potassium and medium trace element, improves the validity of these plant-growth essential nutrient elements.Meanwhile, the active group in humic acids, as carboxyl, phenolic hydroxyl group etc. can promote crop root growth, improves improving activity of root system, strengthens the ability of Crop nutrient.
Up to the present, the structure of the not yet clearly each humic acids component of scientific research personnel and on fertilizer release and the impact transformed, impact etc. on plant growth, this seriously inhibits deep development and the efficiency utilization of humic acids.At present, researchist utilizes alkali-soluble acid analysis more, acetone (ethanol) extracts the traditional method of classification, the constitutional features etc. of research humic acids, also researchist is had by humic acids separation, classification, obtain total humic acid, pyrotomalenic acid, yellow humic acid and hymatomalenic acid 4 kinds of fractions (Zhao Hongyan, Zhang Zeyou, Zhao Xia, " application of humic acid in peat class material in clean coal technology ", " humic acids ", (4), 15-21(2006)).But the method for these classifications is all more extensive, be difficult to launch the further investigation to humic acids.Researchist is also had to utilize the method for ultrafiltration humic acids to be divided into 8 fraction (LiL, ZhaoZ Y, Huang W L, et al. " Characterization of humic acids fraetionated by ultrafi1tration ", " Organic Geochemistry ", 35 (9), 1025-1037.(2004)), but due to the difference of ultrafiltration apparatus the unstable result of this research method is caused.To the present situation that humic acids investigative technique is extensive directly cause resource of humic acid to utilize extensive, the degree of depth developed is inadequate, although the resource of humic acid of China is very abundant, but humic acids is also Nonrenewable resources, need to save and utilize, deep development, improves its utilising efficiency, gives full play to the effect of humic acids in industrial and agricultural production.
The present invention, according to the humic acids characteristic that solvability is different under different pH, take pH as index, is separated by the humic acids in weathered coal or brown coal according to different pH scopes, therefore be also referred to as " pH cutting method ".The present inventor has carried out lot of experiments research work on the basis of summing up prior art, finally completes the present invention.
[summary of the invention]
[technical problem that will solve]
The object of this invention is to provide a kind of method being separated humic acids in pH mode.
Another object of the present invention is to provide the described purposes being separated humic acids method in pH mode.
[technical scheme]
The present invention is achieved through the following technical solutions.
The present invention relates to a kind of method being separated humic acids in pH mode.
The step of the method is as follows:
A, extraction fulvo acid
Raw material weathered coal or brown coal powder are broken to more than 80 orders, then in a kettle., according to coal dust and water weight ratio 1:4 ~ 5, described coal dust is added in water, extract 5 ~ 10 minutes under the condition of temperature 40 DEG C ~ 50 DEG C, then room temperature is cooled to, obtain the supernatant liquor Q containing fulvo acid through centrifugation, its pH is W, with precipitation L.
Described weathered coal is a kind of by weathering, and its chemistry and physical properties all there occurs and very significantly change, and have occurred that oxygen level increases, and thermal value reduces and contains the coal of the considerable changes such as regeneration humic acids; Described brown coal are coals that degree of coalification is low, and its outward appearance is many in brown, and dull contains the soil ulmin of higher inherent moisture and different quantities.
In the present invention, raw material weathered coal or brown coal are used in normally used disintegrating apparatus in coal processing technique field and pulverize, the described disintegrating apparatus pulverizer that to be such as Weifang Jinghua Powder Engineering Equipment Co.Ltd sell with trade(brand)name JHM elite mill, upper hamming work heavy equipment company limited sells with trade(brand)name energy-saving ball mill pulverizer, Henan Zheng Ya mechanical means Manufacturing Co., Ltd is with the pulverizer of the energy-efficient ball milling agent sale of trade(brand)name.
B, with pH mode separating water-soluble humic acids
(i) under the condition stirred, concentration 20% inorganic acid aqueous solution is by weight dripped containing in the supernatant liquor Q of fulvo acid toward described, by the pH regulator to 1 of the described supernatant liquor Q containing fulvo acid, obtain containing at pH < 1 solubilized humic acids HA through centrifugation
1supernatant liquor Q
1with precipitation L
1;
(ii) under the condition stirred, according to precipitation L
1with weight ratio 1:4 ~ 5 of water, L will be precipitated
1soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 2, obtain containing at pH1 ~ 2 solubilized humic acids HA through centrifugation
2supernatant liquor Q
2with precipitation L
2;
(iii) under the condition stirred, according to precipitation L
2with weight ratio 1:4 ~ 5 of water, L will be precipitated
2soluble in water, re-use concentration by weight 20% inorganic base aqueous solution be W by its pH regulator to pH value, obtain containing solubilized humic acids HA under pH2 ~ W
3humic acid liquid Q
3;
C, to be separated humic acids precipitation L in pH mode
(i), under the condition stirred, according to weight ratio 1:4 ~ 5 of precipitation L and water, will L be precipitated soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 4, obtain containing in pH W ~ 4 time solubilized humic acids HA through centrifugation
4supernatant liquor HA
4with precipitation L
4;
(ii) under the condition stirred, according to precipitation L
4with weight ratio 1:4 ~ 5 of water, L will be precipitated
4soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 4.5, through centrifugation obtain containing in pH4 ~ 4.5 time solubilized humic acids HA
4.5supernatant liquor HA
4.5with precipitation L
4.5;
(iii) implement according to the mode (ii) same with above-mentioned steps, from pH5.0, repeat implementation step (ii) n time according to 0.5 pH unit sequence, so obtain respectively containing solubilized humic acids HA
5+0.5nsupernatant liquor HA
5+0.5nwith precipitation L
5+0.5n, wherein n=0 ~ 16.
In aforesaid operations of the present invention, the mineral alkali of use is sodium hydroxide, potassium hydroxide, sodium carbonate or salt of wormwood.
In aforesaid operations of the present invention, the mineral acid of use is sulfuric acid, hydrochloric acid, nitric acid or phosphoric acid.
In the present invention, heating the equipment that uses is heating installation that is normally used in the art, that sell in the market, the reactor that reactor, Henan Wanda Chemical Equipment Co., Ltd. that such as Wuxi City Hai Da chemical machinery company limited sells with trade(brand)name electrically heated stainless steel cauldron sell with trade(brand)name KF type glassed steel reaction vessels with the reactor of trade(brand)name electrically heated stainless steel cauldron and the sale of steam heating stainless steel cauldron, Zibo Tai Ji glass-lined equipment company limited.
In the present invention; centrifugal used equipment is whizzer that is normally used in the art, that sell in the market, the whizzer that whizzer, Bengbu grand pharmaceutical machine equipment company limited that whizzer, You Feng mechanical means Manufacturing Co., Ltd of Zhangjagang City that such as Shanghai chemical machinery Co., Ltd., Factory sells with trade(brand)name horizontal scraper discharging centrifuge sell with trade(brand)name 3-foot unloading under scraper whizzer sell with trade(brand)name 3-foot unloading under scraper whizzer.
In the present invention, measuring the equipment that uses of pH value of solution is pH meter that is normally used in the art, that sell in the market, the desk-top pH meter 6173 of such as Shanghai Yi Bo Instrument Ltd. trade(brand)name sell pH meter, Shanghai Ai Ce Electronic Science and Technology Co., Ltd. in the pH meter of trade(brand)name A331919pH sale, the right Instrument Ltd. in Shanghai in the pH meter of trade(brand)name MP511pH sale.
Adopt the humic acids infrared spectra that conventional infrared spectroscopic determination obtains under condition of different pH, it the results are shown in attached Fig. 1 and 2.
As can be seen from Fig. 1 and Fig. 2, the humic acids in pH6.5 ~ 7 with pH12.5 ~ 13 scope is at wave number 1000cm
-1~ 3500cm
-1there is the difference of highly significant in interior spectrogram, method of the present invention can be used for studying the relation between different pH scope humic acids unit structure differences and its activity.
The invention still further relates to the method that is separated humic acids in pH mode at research humic acids constitutional features and molecular weight thereof, humic acids activation method (such as the method such as fermentable, oxidation) to the humic acids extraction yield within the scope of different pH and the purposes in structure influence thereof.
The invention still further relates to the purposes of method in farming research being separated humic acids in pH mode.
Described farming research comprises the impact that the humic acids within the scope of different pH discharges on the humic acids within the scope of the impact of plant growth, different pH fertilizer and transforms.The impact that different pH scope humic acids discharges on the impact of plant growth, different pH scope humic acids fertilizer and transforms, these results of study are the research and development of novel humic acid fertilizer auxiliary agent and the deep development supplying method deposit of resource of humic acid.
[beneficial effect]
The invention has the beneficial effects as follows: adopt method of the present invention can determine the distribution of humic acids in different pH scope, for studying its constitutional features, extraction yield, the activation method of humic acids, each pH scope humic acids is on plant growth, support fertilizer release and the impact transformed and the deep development of humic acids and efficiency utilization supplying method.
[accompanying drawing explanation]
Fig. 1 is the infared spectrum of humic acids in the scope of pH6.5 ~ 7.0.
Fig. 2 is the infared spectrum of humic acids in the scope of pH12.5 ~ 13.0.
[embodiment]
The present invention can be understood better by following embodiment.
Embodiment 1: be separated humic acids in pH mode
The implementation step of this embodiment is as follows:
A, extraction fulvo acid
The raw material weathered coal that Inner Mongol Wuhai produces is crushed to more than 80 orders, then in a kettle., according to coal dust and water weight ratio 1:4, described coal dust is added in water, extract 5 minutes under the condition of temperature 40 DEG C, then room temperature is cooled to, the whizzer using Shanghai chemical machinery Co., Ltd., Factory to sell with trade(brand)name horizontal scraper discharging centrifuge carries out centrifugation, and the pH meter that the supernatant liquor Q(obtained containing fulvo acid uses Shanghai Yi Bo Instrument Ltd. to sell with the desk-top pH meter 6173 of trade(brand)name measures its pH value for 3.87) and precipitation L;
B, with pH mode separating water-soluble humic acids
(i) under the condition stirred, concentration 20% aqueous sulfuric acid is by weight dripped containing in the supernatant liquor Q of fulvo acid toward described, by the pH regulator to 1 of the described supernatant liquor Q containing fulvo acid, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH < 1 solubilized humic acids HA
1supernatant liquor Q
1with precipitation L
1;
(ii) under the condition stirred, according to precipitation L
1with the weight ratio 1:4 of water, L will be precipitated
1soluble in water, re-use concentration by weight 20% aqueous sodium hydroxide solution by its pH regulator to 2, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH1 ~ 2 solubilized humic acids HA
2supernatant liquor Q
2with precipitation L
2;
(iii) under the condition stirred, according to precipitation L
2with the weight ratio 1:4 of water, L will be precipitated
2soluble in water, re-use concentration by weight 20% aqueous sodium hydroxide solution be 3.87 by its pH regulator to pH value, obtain containing time solubilized humic acids HA in pH2 ~ 3.87
3humic acid liquid Q
3;
C, to be separated humic acids precipitation L in pH mode
(i) under the condition stirred, according to precipitation L and the weight ratio 1:4 of water, will L be precipitated soluble in water, re-use concentration by weight 20% aqueous sodium hydroxide solution by its pH regulator to 4, use above-mentioned whizzer to carry out centrifugation, obtain containing time solubilized humic acids HA in pH3.87 ~ 4
4supernatant liquor HA
4with precipitation L
4;
(ii) under the condition stirred, according to precipitation L
4with the weight ratio 1:4 of water, L will be precipitated
4soluble in water, re-use concentration by weight 20% aqueous sodium hydroxide solution by its pH regulator to 4.5, use above-mentioned whizzer to carry out centrifugation, containing in pH4 ~ 4.5 time solubilized humic acids HA
4.5supernatant liquor HA
4.5with precipitation L
4.5;
(iii) implement according to the mode (ii) same with above-mentioned steps, from pH5.0, repeat implementation step (ii) n time according to 0.5 pH unit sequence, so obtain respectively containing solubilized humic acids HA
5+0.5nsupernatant liquor HA
5+0.5nwith precipitation L
5+0.5n, wherein n=0 ~ 16.
Embodiment 2: be separated humic acids in pH mode
The implementation step of this embodiment is as follows:
A, extraction fulvo acid
The raw material brown coal powder of Xilin Hot, Inner Mongolia is broken to more than 80 orders, then in a kettle., according to coal dust and water weight ratio 1:5, described coal dust is added in water, extract 10 minutes under the condition of temperature 50 C, then room temperature is cooled to, what use Zhangjagang City You Feng mechanical means Manufacturing Co., Ltd to sell with trade(brand)name 3-foot unloading under scraper whizzer carries out centrifugation, obtain the supernatant liquor Q containing fulvo acid, Shanghai Ai Ce Electronic Science and Technology Co., Ltd. is made to measure its pH value for 3.34 in the pH meter of trade(brand)name A331919pH sale, with precipitation L;
B, with pH mode separating water-soluble humic acids
(i) under the condition stirred, concentration 20% aqueous hydrochloric acid is by weight dripped containing in the supernatant liquor Q of fulvo acid toward described, by the pH regulator to 1 of the described supernatant liquor Q containing fulvo acid, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH < 1 solubilized humic acids HA
1supernatant liquor Q
1with precipitation L
1;
(ii) under the condition stirred, according to precipitation L
1with the weight ratio 1:5 of water, L will be precipitated
1soluble in water, re-use concentration by weight 20% potassium hydroxide aqueous solution by its pH regulator to 2, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH1 ~ 2 solubilized humic acids HA
2supernatant liquor Q
2with precipitation L
2;
(iii) under the condition stirred, according to precipitation L
2with the weight ratio 1:4 of water, L will be precipitated
2soluble in water, re-use concentration by weight 20% potassium hydroxide aqueous solution be 3.34 by its pH regulator to pH value, obtain containing time solubilized humic acids HA in pH2 ~ 3.34
3humic acid liquid Q
3;
C, to be separated humic acids precipitation L in pH mode
(i) under the condition stirred, according to precipitation L and the weight ratio 1:4 of water, will L be precipitated soluble in water, re-use concentration by weight 20% potassium hydroxide aqueous solution by its pH regulator to 4, use above-mentioned whizzer to carry out centrifugation, obtain containing time solubilized humic acids HA in pH.... ~ 4
4supernatant liquor HA
4with precipitation L
4;
(ii) under the condition stirred, according to precipitation L
4with the weight ratio 1:4 of water, L will be precipitated
4soluble in water, re-use concentration by weight 20% potassium hydroxide aqueous solution by its pH regulator to 4.5, use above-mentioned whizzer to carry out centrifugation, containing in pH4 ~ 4.5 time solubilized humic acids HA
4.5supernatant liquor HA
4.5with precipitation L
4.5;
(iii) implement according to the mode (ii) same with above-mentioned steps, from pH5.0, repeat implementation step (ii) n time according to 0.5 pH unit sequence, so obtain respectively containing solubilized humic acids HA
5+0.5nsupernatant liquor HA
5+0.5nwith precipitation L
5+0.5n, wherein n=0 ~ 16.
Embodiment 3: be separated humic acids in pH mode
The implementation step of this embodiment is as follows:
A, extraction fulvo acid
The raw material weathered coal of Hami Yiwu County is crushed to more than 80 orders, then in a kettle., according to coal dust and water weight ratio 1:4.5, described coal dust is added in water, extract 8 minutes under the condition of temperature 45 C, then room temperature is cooled to, the whizzer using Bengbu grand pharmaceutical machine equipment company limited to sell with trade(brand)name 3-foot unloading under scraper whizzer carries out centrifugation, obtain the supernatant liquor Q containing fulvo acid, the right Instrument Ltd. in Shanghai is used to measure its pH value for 3.60 in the pH meter of trade(brand)name MP511pH sale, with precipitation L;
B, with pH mode separating water-soluble humic acids
(i) under the condition stirred, concentration 20% aqueous nitric acid is by weight dripped containing in the supernatant liquor Q of fulvo acid toward described, by the pH regulator to 1 of the described supernatant liquor Q containing fulvo acid, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH < 1 solubilized humic acids HA
1supernatant liquor Q
1with precipitation L
1;
(ii) under the condition stirred, according to precipitation L
1with the weight ratio 1:4 of water, L will be precipitated
1soluble in water, re-use concentration by weight 20% aqueous sodium carbonate by its pH regulator to 2, use above-mentioned whizzer to carry out centrifugation, obtain containing at pH1 ~ 2 solubilized humic acids HA
2supernatant liquor Q
2with precipitation L
2;
(iii) under the condition stirred, according to precipitation L
2with the weight ratio 1:4 of water, L will be precipitated
2soluble in water, re-use concentration by weight 20% aqueous sodium carbonate be 3.60 by its pH regulator to pH value, obtain containing time solubilized humic acids HA in pH2 ~ 3.60
3humic acid liquid Q
3;
C, to be separated humic acids precipitation L in pH mode
(i) under the condition stirred, according to precipitation L and the weight ratio 1:4 of water, will L be precipitated soluble in water, re-use concentration by weight 20% aqueous sodium carbonate by its pH regulator to 4, use above-mentioned whizzer to carry out centrifugation, obtain containing time solubilized humic acids HA in pH3.60 ~ 4
4supernatant liquor HA
4with precipitation L
4;
(ii) under the condition stirred, according to precipitation L
4with the weight ratio 1:4 of water, L will be precipitated
4soluble in water, re-use concentration by weight 20% aqueous sodium carbonate by its pH regulator to 4.5, use above-mentioned whizzer to carry out centrifugation, containing in pH4 ~ 4.5 time solubilized humic acids HA
4.5supernatant liquor HA
4.5with precipitation L
4.5;
(iii) implement according to the mode (ii) same with above-mentioned steps, from pH5.0, repeat implementation step (ii) n time according to 0.5 pH unit sequence, so obtain respectively containing solubilized humic acids HA
5+0.5nsupernatant liquor HA
5+0.5nwith precipitation L
5+0.5n, wherein n=0 ~ 16.
Test example 1: the present invention's different pH scope humic acids is on the impact of Maize Seedling improving activity of root system
Sand culture test is utilized to study different pH scope humic acids to the impact of Seedling Root Systems In Maize vigor.
(HA4, HA7, HA12) 4 process that test establishes Routine control (CK) and the embodiment of the present invention 1 to prepare, repeats 6 times.First quartz sand clear water is cleaned, put into stainless steel pallet, keep certain humidity, corn kernel is put into dish, cover on it with wet cloth, under the condition of temperature 25 DEG C, carry out nursery.When corn sprout grow to 3-5cm time, by corn take out put into the cultivation cup filling with quartz sand, watered the humic acid solution of a 25mL concentration 0.1 % by weight every 2 days, CK is 25mL pure water.When corn grows to about 20cm, take out root system, clean with clear water, adopt TTC method (reference: Zhang Xiong, " use " TTC " method (TCC) measures vigor and the application thereof of wheat root and pollen ", " Plant Physiology Communications ", phase nineteen eighty-two the 3rd) measure the improving activity of root system of corn.
Its test-results is listed in the table below in 1.
Table 1: Root Activity in Maize (mg/gh, TTC method)
| Process | Improving activity of root system |
| CK | 0.980 |
| HA4 | 1.732 |
| HA7 | 1.471 |
| HA12 | 1.105 |
Test-results shows, compared with Routine control, the humic acids of different pH scope can improve the improving activity of root system of Maize Seedling, HA
4, HA
7, HA
1276.7%, 50.1% and 12.8% is exceeded respectively than contrast.See thus, increase with the pH dissolving humic acids, it reduces gradually to the increase rate of Root Activity in Maize, and this may be relevant from the component difference of different pH scope humic acids.
Claims (6)
1. be separated a method for humic acids in pH mode, it is characterized in that the step of the method is as follows:
A, extraction fulvo acid
Raw material weathered coal or brown coal powder are broken to more than 80 orders, then in a kettle., according to coal dust and water weight ratio 1:4 ~ 5, described coal dust is added in water, extract 5 ~ 10 minutes under the condition of temperature 40 DEG C ~ 50 DEG C, then room temperature is cooled to, obtain the supernatant liquor Q containing fulvo acid through centrifugation, its pH is W, with precipitation L;
B, with pH mode separating water-soluble humic acids
I () is under the condition stirred, concentration 20% inorganic acid aqueous solution is by weight dripped containing in the supernatant liquor Q of fulvo acid toward described, by the pH regulator to 1 of the described supernatant liquor Q containing fulvo acid, obtain containing at pH < 1 solubilized humic acids HA through centrifugation
1supernatant liquor Q
1with precipitation L
1;
(ii) under the condition stirred, according to precipitation L
1with weight ratio 1:4 ~ 5 of water, L will be precipitated
1soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 2, obtain containing at pH 1 ~ 2 solubilized humic acids HA through centrifugation
2supernatant liquor Q
2with precipitation L
2;
(iii) under the condition stirred, according to precipitation L
2with weight ratio 1:4 ~ 5 of water, L will be precipitated
2soluble in water, re-use concentration by weight 20% inorganic base aqueous solution be W by its pH regulator to pH value, obtain containing solubilized humic acids HA under pH 2 ~ W
3humic acid liquid Q
3;
C, to be separated humic acids precipitation L in pH mode
I () is under the condition stirred, according to weight ratio 1:4 ~ 5 precipitating L and water, to L be precipitated soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 4, through centrifugation obtain containing in pH W ~ 4 time solubilized humic acids HA
4supernatant liquor HA
4with precipitation L
4;
(ii) under the condition stirred, according to precipitation L
4with weight ratio 1:4 ~ 5 of water, L will be precipitated
4soluble in water, re-use concentration by weight 20% inorganic base aqueous solution by its pH regulator to 4.5, obtain containing at pH 4 ~ 4.5 times solubilized humic acids HA through centrifugation
4.5supernatant liquor HA
4.5with precipitation L
4.5;
(iii) implement according to the mode same with above-mentioned steps (ii), from pH 5.0, repeat implementation step (ii) n time according to 0.5 pH unit sequence, so obtain respectively containing solubilized humic acids HA
5+0.5nsupernatant liquor HA
5+0.5nwith precipitation L
5+0.5n, wherein n=0 ~ 16 and n is integer.
2. method according to claim 1, is characterized in that described mineral alkali is sodium hydroxide, potassium hydroxide, sodium carbonate or salt of wormwood.
3. method according to claim 1, is characterized in that described mineral acid is sulfuric acid, hydrochloric acid, nitric acid or phosphoric acid.
4. the method any one of claim 1-3 described in claim at research humic acids constitutional features and molecular weight thereof, humic acids activation method is to the purposes in humic acids extraction yield and structure influence thereof.
5. the purposes of the method any one of claim 1-3 described in claim in farming research.
6. purposes according to claim 5, is characterized in that described farming research comprises humic acids to the impact of plant growth, the impact on fertilizer release and conversion.
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| CN105130535A (en) * | 2015-08-10 | 2015-12-09 | 山西广宇通科技股份有限公司 | Preparation method of humic acid solid water soluble fertilizer |
| CN105061116A (en) * | 2015-08-27 | 2015-11-18 | 山西广宇通科技股份有限公司 | Liquid humic acid water-soluble fertilizer production method |
| CN105176536A (en) * | 2015-09-15 | 2015-12-23 | 江苏锦宇环境工程有限公司 | Preparation method of weathered coal humic acid water retention agent |
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| CN109912365A (en) * | 2017-12-13 | 2019-06-21 | 赵月平 | A kind of production method of fulvo acid |
| CN110092683A (en) * | 2018-01-27 | 2019-08-06 | 内蒙古际美生物技术有限公司 | One kind is rich in sulphur humic acid liquid fertilizer and preparation method thereof |
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| CN101033241B (en) * | 2007-04-29 | 2010-06-16 | 晋城市炬坤生物科技有限公司 | Method of preparing high-purity humic acid |
| CN101423536B (en) * | 2008-12-02 | 2013-12-18 | 昆明理工大学 | Method for preparing humic acid and salt thereof by oxidation and degradation of brown coal |
| CN102504277A (en) * | 2011-11-04 | 2012-06-20 | 吕玉环 | Innovative process technology for producing humate with weathered coal |
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|---|---|---|---|---|
| CN109232101A (en) * | 2018-11-09 | 2019-01-18 | 中国农业科学院农业资源与农业区划研究所 | A kind of granular urea preparation method containing Humic acid synergistic carrier suitable for rice top dressing |
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| CN103804076A (en) | 2014-05-21 |
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