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Method of preparing NPK composite fertilizer using straw ash

A technology of nitrogen, phosphorus and potassium compound fertilizer and straw ash, which is applied in the field of agricultural fertilizers, can solve the problems of unreasonable fertilizer nutrient ratio and long fertilizer product cycle, and achieve the effect of low cost, high nutrient availability and improved effectiveness

Active Publication Date: 2007-02-07
INST OF SOIL & FERTILIZER SHANDONG ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method solves the shortcomings of strong alkalinity and poor availability of elements, the cycle of producing finished fertilizer products is long, and the proportion of fertilizer nutrients is unreasonable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1. The NPK compound fertilizer with a nutrient content of 45% was manufactured, and the nutrient ratio was N:P 2 O 5 : K 2 O=15:15:15.

[0058] Take 10 parts of powdery raw material straw ash, 25.1 parts of urea, 31.4 parts of monoammonium phosphate, 22.6 parts of potassium chloride, and 9.4 parts of concave-convex powder binder and add them to the running drum in turn, and then take phosphoric acid and citric acid by weight ratio 1.5 parts of acidity regulator mixed with 1:0.3 is mixed with an appropriate amount of water, and sprayed on the reaction material. Rotate the drum for granulation for 5 to 7 minutes. When the reaction raw materials form fertilizer granules with a relatively uniform size, the semi-finished fertilizer enters the drying cylinder.

[0059] The temperature of the drying cylinder is controlled to be 90-110°C, the drying time is 8-12 minutes, the moisture content of the fertilizer is reduced to below 5%, and the dry-hot fertilizer enters ...

Embodiment 2

[0061] Example 2. The NPK compound fertilizer with a nutrient content of 40% was manufactured, and the nutrient ratio was N:P 2 O 5 : K 2 O=15:10:15.

[0062] As described in Example 1, the different raw materials are as follows, all in parts by weight: take 20 parts of straw ash, 28.5 parts of urea, 17.4 parts of monoammonium phosphate, 20.2 parts of potassium chloride, bentonite and concave-convex powder in a weight ratio of 1:3 Add 11 parts of the mixed binder to the rotating drum in turn, weigh 3 parts of the acidity regulator mixed with phosphoric acid and citric acid in a weight ratio of 1:0.5, mix them with an appropriate amount of water, and evenly spray them on the mixed materials.

Embodiment 3

[0063] Example 3. The NPK compound fertilizer with a nutrient content of 35% was manufactured, and the nutrient ratio was N:P 2 O 5 : K 2 O=13:10:12.

[0064] As described in Example 1, the different raw materials are as follows, all in parts by weight: take 30 parts of straw ash, 24.8 parts of urea, 14.7 parts of monoammonium phosphate, 12.9 parts of potassium chloride, bentonite or concave-convex powder in a weight ratio of 1:2 Add 13.2 parts of the mixed binder to the rotating drum in turn, weigh 4.4 parts of the acidity regulator mixed with phosphoric acid and citric acid in a weight ratio of 1:0.3, mix it with an appropriate amount of water, and evenly spray it on the mixed material.

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Abstract

This invention relates to a preparation method for nitrogen phosphorus potassium (NPK) compound fertilizer for straw ash production, belonging to the field of agricultural fertilizer technology. NPK fertilizer includes (by weight parts) urea 18-30, monoammonium phosphate 12-30, potassium chloride 7-25, straw ash 10-40, acidity regulator 1.2-6, and adhesive 5-20. The method comprises smashing the raw materials, drum-granulating, drying, screening, weighing, and packaging to obtain the final product. The NPK contains nutrient nitrogen, phosphorus, potassium content greater than 30%, and medium-trace nutrients in gray straw, therefore having comprehensive and reasonable nutrition, can be applied directly to various soils and crops without need for other fertilizers. The production equipment is simple, and low cost, solving the inadequacy of the present fertilizer production. This invention provides an effective way for the straw ash generated from straw power and reduce the environmental pollution.

Description

technical field [0001] The invention relates to a method for producing nitrogen-phosphorus-potassium compound fertilizer by utilizing straw ash, and belongs to the technical field of agricultural fertilizers. Background technique [0002] my country is a big agricultural country, producing up to 660 million tons of crop straw every year. According to the survey, the current utilization of such a huge amount of straw is not optimistic: 6.9% of straw is directly returned to the field, 14.9% of the straw is returned to the field, 13.3% is used for composting, 11.9% is used for rural living energy, 7.8% is the raw material for industrial and sideline production, and the straw is comprehensively used. The utilization rate is 54.8%, and the remaining 45.2% of the straw still needs to be reused. [0003] At present, in the three summers or three autumns, it is common for farmers to burn the remaining straw. Straw burning not only leads to the increase of suspended particles in th...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05C9/00C05B7/00C05D1/02C05F11/02
Inventor 李彦张英鹏董晓霞高弼模张荣全魏建林
Owner INST OF SOIL & FERTILIZER SHANDONG ACAD OF AGRI SCI
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