Method for preparing fulvic acid salt by using composite photocatalyst to activate low-rank coal

A technology of fulvic acid and low-rank coal, which is applied in the field of coal chemical industry, can solve the problems of unfavorable promotion and use, high resin cost, and many preparation steps, and achieve the effect of improving alkali extraction efficiency, increasing yield, and improving extraction efficiency

Active Publication Date: 2018-06-08
QUJING NORMAL UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method of the invention has a simple separation process, it is difficult to effectively convert the large-molecule humic acid into small-molecule fulvic acid, and the preparation steps are many, the operation is complicated, the cost of the resin is high, and it is difficult to recycle. Difficult, not conducive to popularization and use in agriculture

Method used

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  • Method for preparing fulvic acid salt by using composite photocatalyst to activate low-rank coal

Examples

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Effect test

Embodiment 1

[0037] A method for preparing fulvic acid sodium salt by activating low-rank coal with a composite photocatalyst, comprising the steps of:

[0038] Grind 100g of lignite to a particle size of 30 mesh powder, add it to 200g of water, then add solid sodium hydroxide to adjust the pH to 8, stir at room temperature for 1 hour, add 50g of hydrogen peroxide with a mass fraction of 30%, and react at a temperature of 25°C 3h, after centrifugal separation, take the upper layer solution to obtain humate solution;

[0039] In above-mentioned humate solution, add 0.45g average particle diameter and be 5nm TiO2 (purity is greater than 99.5%, anatase type, Hangzhou Wanjing New Nano Material Technology Co., Ltd. has sale) and 0.05g average particle diameter is 90nm ± 10nm ZnO, under the condition of ultraviolet light irradiation with a wavelength of 254nm, after each continuous irradiation for 8 minutes, stop the irradiation for 1 minute in the middle, stir and react at room temperature for ...

Embodiment 2

[0041] A method for preparing potassium fulvic acid by activating low-rank coal with a composite photocatalyst, comprising the steps of:

[0042] Grind 100g of lignite to powder with a particle size of 40 mesh, add it to 400g of water, then add solid potassium hydroxide to adjust the pH to 10, stir at room temperature for 2 hours, add 100g of 30% hydrogen peroxide, and react for 2 hours at a temperature of 40°C. After centrifugation, take the upper layer solution to obtain a humate solution;

[0043]Adding 0.45g mean particle diameter in above-mentioned humate solution is the TiO of 21nm (purity is greater than 99.5%, German Degussa P25 type titanium dioxide, is the mixed crystal form of anatase and rutile, wherein the weight of anatase and rutile The ratio is 80 / 20) and 0.05g of ZnO with an average particle size of 50nm±10nm. Under the irradiation of ultraviolet light with a wavelength of 365nm, after each continuous irradiation for 8 minutes, stop the irradiation for 2 minut...

Embodiment 3

[0045] A method for preparing fulvic acid sodium salt by activating low-rank coal with a composite photocatalyst, comprising the steps of:

[0046] Grind 100g of lignite to a particle size of 60 mesh powder, add it to 600g of water, then add solid sodium hydroxide to adjust the pH to 11, stir at room temperature for 1.5h, add 150g of 30% hydrogen peroxide, and react at a temperature of 55°C 1h, obtain humic acid salt solution after filtering;

[0047] Adding 0.085g average particle diameter in above-mentioned humate solution is 60nm TiO2 (purity is greater than 99.5%, anatase type, Aladdin reagent company has sale) and 0.015g average particle diameter is the ZnO of 90nm ± 10nm, at wavelength Under the condition of 254nm ultraviolet light irradiation, after each continuous irradiation for 5 minutes, stop the irradiation for 2 minutes in the middle, stir and react at room temperature for 6 hours, then centrifuge, take the centrifuged upper layer solution and evaporate to dryness...

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Abstract

The invention provides a method for preparing fulvic acid salt by using a composite photocatalyst to activate low-rank coal. The method comprises the following steps of uniformly mixing the low-rank coal powder and water, adding alkaline to adjust the pH (potential of hydrogen) value to 8 to 11, stirring for 1 to 2h, adding an oxidant, reacting for 1 to 3h at the temperature of 25 to 55 DEG C, andseparating solid and liquid, so as to obtain a humic acid salt solution; adding the composite photocatalyst, stirring to react for 2 to 6h under the condition of ultraviolet radiation, separating solid and liquid, taking the solution and evaporating, so as to obtain the solid fulvic acid salt product. The method has the advantages that the production technology is simple, the green and environment-friendly effects are realized, the production cost is low, the activating rate of the humic acid in the low-rank coal is high, and the yield rate of the fulvic acid salt prepared by the low-rank coal is obviously improved.

Description

technical field [0001] The invention relates to a method for preparing fulvic acid by activating low-rank coal with a composite photocatalyst, and belongs to the technical field of coal chemical industry. Background technique [0002] Low-rank coal refers to a kind of coal with long flame, smoke and low degree of coalification when burning, including lignite, peat and weathered coal. The content of humic acid in low-rank coal can be as high as 30%-80%. The humic acid in it can be used as fertilizer synergist, soil improver and pesticide slow-release synergist, etc. It is a green and environmentally friendly organic fertilizer. Humic acid includes three types of fulvic acid, brown humic acid and black humic acid, and the molecular weight increases in turn. The smaller the molecular weight of humic acid, the more obvious the effect of improving soil and promoting plant growth. However, the content of small molecule fulvic acid in low-rank coal itself is not high, and it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00B01J23/06B01J35/02
CPCB01J21/063B01J23/06B01J35/0006B01J35/004B01J35/023C07G99/00
Inventor 高建仁邵光伟张水花李本鸿宋涛邢士玉张艳玲刘勇尤龙李新柱
Owner QUJING NORMAL UNIV
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