CN103820500B - Waste cotton seed is utilized to produce the processing method of humic acid - Google Patents
Waste cotton seed is utilized to produce the processing method of humic acid Download PDFInfo
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- CN103820500B CN103820500B CN201410052885.XA CN201410052885A CN103820500B CN 103820500 B CN103820500 B CN 103820500B CN 201410052885 A CN201410052885 A CN 201410052885A CN 103820500 B CN103820500 B CN 103820500B
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Abstract
The invention discloses a kind of waste cotton seed that utilizes and produce the processing method of humic acid, comprise the steps: a, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio of 1:1 ~ 1:2.5, is the environment bottom fermentation 10 ~ 40 days of 15 ~ 25 DEG C in temperature; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 ~ 1:0.05 add alkalization pond alkalization 4 ~ 8 little time, cross leaching solution and be humic acid solution.Compared with prior art, practicality of the present invention has energy-conserving and environment-protective, does not use brown coal or weathered coal to be raw material, and can by features such as a large amount of waste cotton seed recyclings.
Description
Technical field
The present invention relates to a kind of processing method of producing humic acid, especially a kind of processing method utilizing waste cotton seed to produce humic acid.
Background technology
Domestic last century the nineties just start the correlative study having humic acid.But mainly concentrate on two aspects, one is utilize weathered coal to carry out humic acid extraction, one is the preparation carrying out fertilizer using humic acid as interpolation auxiliary material, and Two decades years achieves more significant effect.
As in the humic acid extraction process of routine, the material selected mainly contains weathered coal, brown coal, crop material, and the extraction agent selected mainly contains alkaline matter (as KOH, NH4OH, Na2CO3, Na4P2O7 etc.), neutral salt (as NaF, Na2C2O4 etc.), acidulous material (as oxalic acid, citric acid, pump formic acid etc.), organic solvent (as ethanol, ketone, pyridine etc.) and mixing solutions (NaOH and Na4P2O7) five class.Extracting method is based on extracting directly.
The raw material of current manufacture humic acid is mainly based on brown coal and weathered coal, very consumes resources, and the Solid state fermentation after extracting also can bring a lot of environmental problem.
Along with the development of Production of manure industry, an important use of current humic acid, be used in prepare humic acid fertilizer or directly use as soil improving agent, but most of producer only focuses on the effect of humic acid itself, too much do not consider the characteristic of soil during otherness and the fertilising of raw material resources recycling, humic acid product, and utilizing special raw material---waste cotton seed carries out the optimization of biochemical humic acid extracting method, can produce for fertilizer industry and new product is provided, for Agriculture in Xinjiang fertilising provides new approaches.
Therefore, a kind of energy-conserving and environment-protective, do not use brown coal or weathered coal to be raw material, and the processing method of the humic acid of a large amount of waste cotton seed recycling can be suggested.
Summary of the invention
The object of this invention is to provide a kind of processing method utilizing waste cotton seed to produce humic acid.
The present invention includes following steps:
A, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio for 1:1 ~ 1:2.5 are the environment bottom fermentation 10 ~ 40 days of 15 ~ 25 DEG C in temperature;
B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 ~ 1:0.05 add alkalization pond alkalinisation treatment 4 little time more than, be preferably 4 ~ 8 hours, cross leaching solution and namely obtain humic acid solution of the present invention.
Waste cotton seed described in above-mentioned a step can be through lint, and also can be through dressing, can also be the mixing of lint and dressing.
The waste cotton seed of above-mentioned a step is preferably crushed to 0.1mm ~ 0.5mm.
During above-mentioned a step fermentation, the ratio being preferably 1:0.001 ~ 1:0.01 according to waste cotton seed and cellulose-decomposing bacteria weight ratio adds cellulose-decomposing bacteria.
As improvement, after above-mentioned a step fermentation, filtered by the material after fermentation with 1 ~ 3mm filter screen, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively.
By leaving the fermented liquid in alkalization pond A in, adding 9 ~ 10g potassium hydroxide according to 1L fermented liquid, alkalizing more than 4 hours under the environment of 15 ~ 25 DEG C, be preferably 4 ~ 8 hours;
Fermentation slag charge in alkalization pond B will be left in, according to adding potassium hydroxide solution 5 ~ 7L that concentration is 0.15 ~ 0.25mol/L in per kilogram fermentation residue (with dry basis), alkalize 4 ~ 8 hours under the environment of 15 ~ 25 DEG C, then the solution in alkalization pond A and alkalization pond B is filtered to obtain humic acid solution.
Above-mentioned humic acid solution is preferably selected the filter screen of 38 ~ 75 μm and is filtered by the mode of negative pressure leaching, can obtain the product of drip irrigation-grade.
As further improvement, after above-mentioned b step alkalinisation treatment, gained humic acid solution carries out acidification: select volume ratio to be that the hydrochloric acid of 5:1 ~ 20:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 15 ~ 18%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.0 ~ 3.0, acidification more than 4 hours under the environment of 15 ~ 25 DEG C, be preferably 4 ~ 8 hours, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of less than 38 μm again, the method of negative pressure leaching is adopted to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be arrived.
As improvement, the xanthohumic acid solution after above-mentioned acidifying preferably precipitates more than 12 hours under the environment of 15 ~ 25 DEG C, is preferably 12 ~ 24 hours, then gets supernatant liquor under the environment of 102 ~ 110 DEG C and dewaters, can obtain xanthohumic acid solid phase prod further.
Compared with prior art, practicality of the present invention has energy-conserving and environment-protective, does not use brown coal or weathered coal to be raw material, and can by features such as a large amount of waste cotton seed recyclings.
Accompanying drawing explanation
Fig. 1 is present invention process schematic flow sheet.
Embodiment
Embodiment 1:
The present invention includes following steps: a, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio for 1:1, is the environment bottom fermentation 20 days of 25 DEG C in temperature; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 add alkalization pond alkalinisation treatment 4 little time, cross leaching solution and namely obtain humic acid solution of the present invention.
Embodiment 2:
The present invention includes following steps: a, fermentation: add fermentation vat with water by weight for the ratio of 1:2 after waste cotton seed is crushed to 0.5mm, is the environment bottom fermentation 10 days of 15 DEG C in temperature; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.05 add alkalization pond alkalinisation treatment 6 little time, cross leaching solution and namely obtain humic acid solution of the present invention.
Embodiment 3:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.2mm, add fermentation vat with water by weight the ratio for 1:2.5, at the environment bottom fermentation 40 days that temperature is 20 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.01; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 add alkalization pond alkalinisation treatment 8 little time, cross leaching solution and namely obtain humic acid solution of the present invention.
Embodiment 4:
The present invention includes following steps: a, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio for 1:1.5, is the environment bottom fermentation 30 days of 18 DEG C in temperature; After fermentation, filtered by the material 2mm filter screen after fermentation, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively; B, alkalization: by leaving the fermented liquid in alkalization pond A in, adding 10g potassium hydroxide according to 1L fermented liquid, alkalizing 5 hours under the environment of 25 DEG C; Fermentation slag charge in alkalization pond B will be left in, according to adding the potassium hydroxide solution 7L that concentration is 0.25mol/L in per kilogram fermentation residue (with dry basis), alkalize 4 hours under the environment of 15 DEG C, then the solution in alkalization pond A and alkalization pond B is filtered to obtain humic acid solution.
Embodiment 5:
The present invention includes following steps: a, fermentation: add fermentation vat with water by weight for the ratio of 1:1.2 after waste cotton seed is crushed to 0.4mm, is the environment bottom fermentation 25 days of 22 DEG C in temperature; After fermentation, filtered by the material 1mm filter screen after fermentation, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively; B, alkalization: by leaving the fermented liquid in alkalization pond A in, adding 9g potassium hydroxide according to 1L fermented liquid, alkalizing 10 hours under the environment of 15 DEG C; Fermentation slag charge in alkalization pond B will be left in, according to adding the potassium hydroxide solution 6L that concentration is 0.15mol/L in per kilogram fermentation residue (with dry basis), alkalize 6 hours under the environment of 20 DEG C, then the solution in alkalization pond A and alkalization pond B is filtered to obtain humic acid solution.
Embodiment 6:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.3mm, add fermentation vat with water by weight the ratio for 1:2.3, at the environment bottom fermentation 35 days that temperature is 15 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.006; After fermentation, filtered by the material 3mm filter screen after fermentation, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively; B, alkalization: by leaving the fermented liquid in alkalization pond A in, adding 10g potassium hydroxide according to 1L fermented liquid, alkalizing 9 hours under the environment of 20 DEG C; Fermentation slag charge in alkalization pond B will be left in, according to adding the potassium hydroxide solution 5L that concentration is 0.2mol/L in per kilogram fermentation residue (with dry basis), alkalize 10 hours under the environment of 25 DEG C, then the solution in alkalization pond A and alkalization pond B is filtered to obtain humic acid solution.
Embodiment 7:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.1mm, add fermentation vat with water by weight the ratio for 1:1.8, at the environment bottom fermentation 25 days that temperature is 25 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.003; After fermentation, filtered by the material 1.5mm filter screen after fermentation, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively; B, alkalization: by leaving the fermented liquid in alkalization pond A in, adding 9g potassium hydroxide according to 1L fermented liquid, alkalizing 6 hours under the environment of 15 DEG C; Fermentation slag charge in alkalization pond B will be left in, according to adding the potassium hydroxide solution 7L that concentration is 0.15mol/L in per kilogram fermentation residue (with dry basis), alkalize 7 hours under the environment of 25 DEG C, again the solution in alkalization pond A and alkalization pond B is filtered to obtain humic acid solution, obtained humic acid solution selected the filter screen of 75 μm and filter by the mode of negative pressure leaching, the product of drip irrigation-grade can be obtained.
Embodiment 8:
The present invention includes following steps: a, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio for 1:1.1, is the environment bottom fermentation 15 days of 22 DEG C in temperature; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.05 add alkalization pond alkalinisation treatment 7 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 15:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 15%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.0, acidification 7 hours under the environment of 18 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of 50 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 12 hours under the environment of 15 DEG C, then gets supernatant liquor under the environment of 108 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Embodiment 9:
The present invention includes following steps: a, fermentation: waste cotton seed and water are added fermentation vat by weight the ratio for 1:2, is the environment bottom fermentation 15 days of 18 DEG C in temperature; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 add alkalization pond alkalinisation treatment 10 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 20:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 15%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.7, acidification 7 hours under the environment of 16 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of 38 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 15 hours under the environment of 20 DEG C, then gets supernatant liquor under the environment of 103 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Embodiment 10:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.2mm, add fermentation vat with water by weight the ratio for 1:1.5, at the environment bottom fermentation 10 days that temperature is 15 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.004; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 add alkalization pond alkalinisation treatment 8 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 10:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 18%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.2, acidification 4 hours under the environment of 22 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of 80 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 20 hours under the environment of 18 DEG C, then gets supernatant liquor under the environment of 104 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Embodiment 11:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.2mm, add fermentation vat with water by weight the ratio for 1:2.5, at the environment bottom fermentation 10 days that temperature is 18 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.005; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 add alkalization pond alkalinisation treatment 8 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 8:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 17%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.4, acidification 4 hours under the environment of 22 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of less than 48 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 24 hours under the environment of 15 DEG C, then gets supernatant liquor under the environment of 102 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Embodiment 12:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.4mm, add fermentation vat with water by weight the ratio for 1:1.8, at the environment bottom fermentation 25 days that temperature is 23 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.004; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.05 add alkalization pond alkalinisation treatment 6 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 13:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 18%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.5, acidification 8 hours under the environment of 20 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of less than 75 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 18 hours under the environment of 20 DEG C, then gets supernatant liquor under the environment of 107 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Embodiment 13:
The present invention includes following steps: a, fermentation: after waste cotton seed is crushed to 0.4mm, add fermentation vat with water by weight the ratio for 1:2.2, at the environment bottom fermentation 25 days that temperature is 17 DEG C, and add cellulose-decomposing bacteria according to the ratio that waste cotton seed and cellulose-decomposing bacteria weight ratio are 1:0.005; B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.05 add alkalization pond alkalinisation treatment 6 little time, cross leaching solution and namely obtain humic acid solution of the present invention; C, acidifying: after having alkalized, volume ratio is selected to be that the hydrochloric acid of 22:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 16%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid when pH value reaches 2.7, acidification 8 hours under the environment of 20 DEG C, obtain the high first class product of humic acid of the present invention, i.e. xanthohumic acid solution, gained xanthohumic acid solution preferably uses the filter screen of less than 40 μm again, adopt the method for negative pressure leaching to carry out leaching filtrate, drip irrigation-grade xanthohumic acid solution product can be obtained.
As improvement, the xanthohumic acid solution after above-mentioned acidifying precipitates 20 hours under the environment of 25 DEG C, then gets supernatant liquor under the environment of 110 DEG C to dewater, and can obtain xanthohumic acid solid phase prod further.
Claims (7)
1. utilize waste cotton seed to produce a processing method for humic acid, comprise the steps:
A, fermentation: by waste cotton seed and water add fermentation vat by weight the ratio of 1:1 ~ 1:2.5, be the environment bottom fermentation 10 ~ 40 days of 15 ~ 25 DEG C in temperature;
B, alkalization: after having fermented, according to waste cotton seed and potassium hydroxide solid weight than the ratio for 1:0.04 ~ 1:0.05 add alkalization pond alkalization 4 ~ 8 little time, cross leaching solution and be humic acid solution;
C, acidification: select volume ratio to be that the hydrochloric acid of 5:1 ~ 20:1 and phosphoric acid mixing solutions are as acidizing fluid, acidizing fluid concentration is 15 ~ 18%, acidizing fluid is joined gradually in humic acid solution, stop adding acidizing fluid, acidification 4 ~ 8 hours under the environment of 15 ~ 25 DEG C when pH value reaches 2.0 ~ 3.0.
2. the processing method utilizing waste cotton seed to produce humic acid according to claim 1, it is characterized in that: during described fermentation, the ratio being 1:0.001 ~ 1:0.01 according to waste cotton seed and cellulose-decomposing bacteria weight ratio adds cellulose-decomposing bacteria.
3. the processing method utilizing waste cotton seed to produce humic acid according to claim 1 and 2, it is characterized in that: after described a step fermentation, filtered with 1 ~ 3mm filter screen by material after fermentation, gained fermented liquid and fermentation slag charge are inserted in alkalization pond A and alkalization pond B respectively;
By leaving the fermented liquid in alkalization pond A in, adding 9 ~ 10g potassium hydroxide according to 1L fermented liquid, alkalizing 4 ~ 8 hours under the environment of 15 ~ 25 DEG C;
Fermentation slag charge in alkalization pond B will be left in, according to adding potassium hydroxide solution 5 ~ 7L that concentration is 0.15 ~ 0.25mol/L in per kilogram fermentation residue, alkalize 4 ~ 8 hours under the environment of 15 ~ 25 DEG C, material filtering in alkalization pond A and alkalization pond B is got solution and namely obtains humic acid solution.
4. the waste cotton seed that utilizes according to claim 1 and 2 produces the processing method of humic acid, it is characterized in that: after acidification step, after gained solution is precipitated 12 ~ 24 hours under the environment of 15 ~ 25 DEG C, gets supernatant liquor under the environment of 102 ~ 110 DEG C and dewaters.
5. the waste cotton seed that utilizes according to claim 3 produces the processing method of humic acid, it is characterized in that: after acidification step, after gained solution is precipitated 12 ~ 24 hours under the environment of 15 ~ 25 DEG C, gets supernatant liquor under the environment of 102 ~ 110 DEG C and dewaters.
6. the processing method utilizing waste cotton seed to produce humic acid according to claim 1 and 2, is characterized in that: precipitate after being filtered by the method for the filter screen employing negative pressure leaching of less than 38 μm by gained solution after acidifying again.
7. the processing method utilizing waste cotton seed to produce humic acid according to claim 3, is characterized in that: precipitate after being filtered by the method for the filter screen employing negative pressure leaching of less than 38 μm by gained solution after acidifying again.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062894A (en) * | 1991-12-21 | 1992-07-22 | 杨孟佩 | A kind of composition fertilizer and method for making thereof |
| CN1065491A (en) * | 1992-05-18 | 1992-10-21 | 河北省安平县生物化工厂 | Produce the method for humic acids, amino acid, dna mixture with biochemical process |
| CN1070659A (en) * | 1992-09-22 | 1993-04-07 | 许计茂 | From cottonseed, bran chaff, the dregs of fat, extract the method for humic acids |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062894A (en) * | 1991-12-21 | 1992-07-22 | 杨孟佩 | A kind of composition fertilizer and method for making thereof |
| CN1065491A (en) * | 1992-05-18 | 1992-10-21 | 河北省安平县生物化工厂 | Produce the method for humic acids, amino acid, dna mixture with biochemical process |
| CN1070659A (en) * | 1992-09-22 | 1993-04-07 | 许计茂 | From cottonseed, bran chaff, the dregs of fat, extract the method for humic acids |
Non-Patent Citations (1)
| Title |
|---|
| 枯草芽孢杆菌发酵生产腐植酸条件研究;刘志坚等;《福州大学学报》;20090430;第37卷(第2期);294-297 * |
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