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Porous lignin particle composite fertilizer preparation method

A technology of lignin and compound fertilizer, which is applied in the direction of fertilization device, fertilizer mixture, application, etc., and can solve problems such as poor effect

Inactive Publication Date: 2013-06-19
NORTHEAST FORESTRY UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But simple addition of inorganic compounds to soil does not work well in tightly bound, saline and eroded soils (e.g., saline soils)

Method used

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  • Porous lignin particle composite fertilizer preparation method
  • Porous lignin particle composite fertilizer preparation method
  • Porous lignin particle composite fertilizer preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 3.0g of industrial lignin and add 0.6mL of 20% NaOH solution, then adjust the pH to 10 with distilled water, then add 4.8mL of formaldehyde, mix well and transfer to a 100mL three-necked bottle, stir in a constant temperature water bath at 90°C to generate crosslinking React for 2 hours, cool to prepare lignin cross-linked body A, and then mix A, an appropriate amount of ammonium bicarbonate and a lignin particle setting agent evenly. The pH was adjusted to 5 with 10% HCl solution, and 2.03 g of urea and 0.4 g of ferric nitrate were added. React in a water bath at 90°C for 2 hours to fully react the lignin cross-linking compound to obtain a porous lignin compound fertilizer D with a nitrogen content of 23.96% and an iron content of 0.375% (see the relationship between the amount of ammonium bicarbonate and the porosity) Table 1), mix the porous lignin compound fertilizer D with peat, starch, and water in a blender at a ratio of 50:5:42:3, and use a granulator to e...

Embodiment 2

[0025] Accurately weigh 1.0 g of the porous granular lignin compound fertilizer in the above-mentioned Example 1 and place it in a 250 mL dry conical flask, add 100 mL of distilled water for soaking, take 3 groups of samples for filtration at regular intervals, and accurately take 0.05 g of the test sample after the filter residue is dried. The sample was digested with sulfuric acid, and the nitrogen content of the remaining residue in the corresponding sample was measured by the Kjeldahl method, and the average value of the three sets of data was taken. After calculation, the slow release of iron element in the porous lignin particle compound fertilizer (iron content: 3.75 mg / g) within 48 hours is shown in Table 3.

[0026] Table 3 Example 1 The slow release situation (unit: mg / g) of porous lignin particle composite fertilizer iron element

[0027]

Embodiment 3

[0029] The lignin cross-linked body A was prepared according to the steps described in Example 1, and A, an appropriate amount of potassium nitrate and 1% sodium alginate were uniformly mixed. Adjust the pH value of the composite system to 5, make the A-coated potassium nitrate settle, and centrifuge to obtain the solid mixture B. B was removed by washing with water to obtain porous lignin C. Mix C and 0.4g ferric nitrate evenly, and dry to prepare porous lignin compound fertilizer D. The porous granular lignin compound fertilizer was prepared according to the granulation process described in Example 1, and the data of its porosity are shown in Table 4.

[0030] Accurately weigh 1.0 g of the porous granular lignin compound fertilizer in the above-mentioned embodiment 3 and place it in a 250 mL dry conical flask, add 100 mL of distilled water to soak, take 3 groups of samples for filtration at regular intervals, and accurately take 0.05 g of the test sample after the filter re...

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Abstract

The present invention provides a porous lignin particle composite fertilizer preparation method. The technical scheme comprises: carrying out a reaction of alkaline lignin and formaldehyde to prepare a lignin cross-linking body A; uniformly mixing the A, a pore-forming agent and a lignin particle setting agent; adjusting the pH value of the composite system, such that the pore-forming agent is coated by the A so as to settle; carrying out centrifugal separation to obtain a solid mixture B; adopting a specific process to remove the pore-forming agent in the B to obtain porous lignin C; adopting a fertilizer solution containing nitrogen, phosphorus, potassium and trace elements to soak the porous lignin C, and carrying out drying molding to prepare porous lignin composite fertilizer D; and uniformly mixing the porous lignin composite fertilizer D, an auxiliary material and an adhesive additive in a stirrer, and adopting a granulator to carry out extrusion granulation on the obtained mixture to prepare the porous lignin particle composite fertilizer. The porous lignin particle composite fertilizer has the following characteristics that: lignin biodegradation is slow, such that the porous lignin particle composite fertilizer can be adopted as a slow-release fertilizer in agriculture so as to solve problems of gradually reduced humus soil in soil due to inorganic fertilizer use and pollution on groundwater by nitrogen, phosphorus, potassium and trace elements in inorganic fertilizers; and the porous lignin particle composite fertilizer further has a porous structure so as to enhance a slow release effect of the composite fertilizer.

Description

technical field [0001] The invention relates to a preparation method of cross-linked porous lignin particle nitrogen / iron compound fertilizer, which belongs to the field of fertilizer preparation. Background technique [0002] Lignin and its derivatives have a variety of functions, and can be used as dispersants, adsorbents / desorbents, oil recovery aids, asphalt emulsifiers, and chemically modified lignin products to increase their added value. Researchers and entrepreneurs in the fields of phytochemistry, natural polymer chemistry, fine chemicals and environmental science have long been concerned about and actively committed to the key areas of research and technology development. The pulp and paper industry needs to separate about 30 million tons of grass lignin from plants every year, which has complex structural components and few reactive chemical functional groups. The utilization of grass lignin is mostly limited to low-value combustion, and its transformation into h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 马艳丽宋江熊腾君王儒儒李大奇
Owner NORTHEAST FORESTRY UNIVERSITY
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