Method for manufacturing slow-release fertilizer casing by using wood residue

A technology for slow-release fertilizers and residues, applied in fertilizer forms, fertilizer mixtures, applications, etc., can solve the problems of reducing the slow-release effect and the inability to seal the surface of fertilizer particles well, achieving rich resources, conducive to fertilization, avoiding The effect of burning seedlings

Inactive Publication Date: 2008-04-09
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfur as a coating material cannot seal the surface of fertilizer particles very well. There are often some "pinholes" or cracks on the surface of the coating, so that water can easily enter the core of the fertilizer through the holes or cracks to quickly dissolve the fertilizer and reduce the Sustained release effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Mold preparation: The mold is designed as a cylindrical model with a height of 200mm, an inner diameter of 80mm, and an outer diameter of 100mm. The chuck on the outer cylinder of the mold is 120mm away from the bottom to ensure that the inner diameter of the shell is 80mm, the outer diameter is 100mm, the bottom thickness is 20mm, and the height is 120mm.

[0038] 2. Wood residue processing: dry the wood residue to an air-dried state and then crush it with a grinder. The screen used for crushing is 16 mesh.

[0039] 3. Preparation of tapioca starch adhesive:

[0040] 1) Formula

[0041] Component Specification Mass / kg

[0042] Cassava flour 80 mesh 100

[0043] Water 550

[0044] Oxidant (H 2 O 2 ) Industrial hydrogen peroxide 3.2

[0045] Pasting agent (NaOH) 10% 15.4

[0046] Complexing agent (sodium borate decahydrate) 98% 2.39

[0047] Catalyst (FeSO 4 .7H 2 O) 0.62

[0048] Drier (CaCO 3 ) 1.84

[0049] Defoamer (tributyl phosphate) 0.26

[0050]2) Preparation proc...

Embodiment 2

[0054] 1. Mold preparation: The mold is designed as a cylindrical model with a height of 280mm, an inner diameter of 120mm, and an outer diameter of 140mm. The height of the chuck from the bottom is 180mm, to ensure that the inner diameter of the shell is 120mm, the outer diameter is 140mm, the bottom thickness is 30mm, and the height is 180mm.

[0055] 2. Wood residue processing: the wood residue is dried to an air-dry state and then crushed with a grinder. The mesh size of the crushing screen is 12 meshes.

[0056] 3. Preparation of cassava starch adhesive:

[0057] 1) Formula

[0058] Component Specification Mass / kg

[0059] Cassava flour 80 mesh 150

[0060] Water 520

[0061] Oxidant (H 2 O 2 ) Industrial hydrogen peroxide 2.5

[0062] Pasting agent (NaOH) 10% 10

[0063] Complexing agent (sodium borate decahydrate) 98% 2

[0064] Catalyst (FeSO 4 .7H 2 O) 0.8

[0065] Drier (CaC0 3 ) 2.4

[0066] Defoamer (tributyl phosphate) 0.2

[0067] 2) Preparation process:

[0068] Mix...

Embodiment 3

[0071] 1. Mold preparation: The mold design is 240m, the inner diameter is 100mm, and the outer diameter is 120mm cylindrical model. The chuck is 150mm away from the bottom, to ensure that the inner diameter of the shell pressed out is 100mm, the outer diameter is 120mm, the bottom thickness is 25mm, and the height is 150mm.

[0072] 2 Wood residue processing: dry the wood residue to an air-dried state and then crush it with a crusher. The crushing uses a sieve of 14 meshes.

[0073] 3 Preparation of cassava starch adhesive:

[0074] 1) Formula

[0075] Component Specification Mass / kg

[0076] Cassava flour 80 mesh 130

[0077] Water 580

[0078] Oxidant (H 2 O 2 ) Industrial hydrogen peroxide 3.5

[0079] Pasting agent (NaOH) 10% 17.5

[0080] Complexing agent (sodium borate decahydrate) 98% 2.5

[0081] Catalyst (FeSO 4 .7H 2 O) 0.5

[0082] Drier (CaCO 3 ) 1.6

[0083] Defoamer (tributyl phosphate) 0.5

[0084] 2) Preparation process:

[0085] Mix the measured cassava flour wit...

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Abstract

The invention provides a method of producing the slow-release fertilizer casing by the wood remainder. Tapioca starch adhesive and powder wood remainder are mixed in a weight proportion of 4 to 10:100, and then evenly stirred; the powder wood remainder with the adhesive is filled into the mould for making the casing, and pressure from 800N to 2000N is exerted, keeping for 2 to 4 minutes; then the casing is obtained by decompressing and stripping. After the fertilizer is filled into the slow-release fertilizer casing produced by the method of the invention and fertilized into the soil, under the effect of rain, the dissolved fertilizer can continuously leak from the inherent cell gap of the wood and the gap in the wood powder so as to supply nutrient to the plant and serve slow release. The invention not only ensures continuous nutrient for the plant, but also prevents seedling death caused by excessive fertilizer; moreover, the wood remainder has rich resources, and the wood remainder and the starch adhesive are both natural polymer materials which are easy to be degraded, thereby ensuring no negative influence to the environment.

Description

Technical field [0001] The invention belongs to a method for manufacturing a slow-release fertilizer shell from wood residues. Background technique [0002] In forestry production, due to the long growth cycle of trees and poor transportation and working conditions, there are increasingly urgent requirements for slow-release fertilizers. In 1967, California, the United States, produced alkyd resin-coated fertilizer. The fertilizer was put in a shell and buried around the trees to fertilize the trees. However, the preparation process of organic coated fertilizer is complicated, the production cost is high, the residue is difficult to degrade, and it pollutes the environment. Moreover, it uses fossil resources, which has certain limitations in the use of raw materials and puts great pressure on the environment. In 1968, Tennessee Valley Ala developed the processing technology of sulfur-coated urea granules and produced sulfur-coated fertilizer. However, sulfur as a coating material...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G5/00
Inventor 符韵林莫昭展乔梦吉徐峰薛振华马晓军李宁江涛孙静周鑫黄启发陈琴闭威英
Owner GUANGXI UNIV
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