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Inorganic and organic moisture composite fertilizer and its oven drying free pelletizing process

A compound fertilizer and granulation technology, applied in the field of compound fertilizer, can solve the problems of increased production cost of moisturizing compound fertilizer, high price of polymer water absorbing agent, no practicality, etc., so as to reduce production links, reduce nutrient loss and addition amount reduced effect

Inactive Publication Date: 2005-03-09
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of the polymer water-absorbing agent, the addition of a polymer water-absorbing agent accounting for more than 1% of the total weight will greatly increase the production cost of the existing moisturizing compound fertilizer, which is difficult to popularize and is not practical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The organic moisturizing fertilizer of the present invention is made by mixing organic matter, chemical fertilizer, and water-absorbing agent. The organic matter adopts sludge with 80% water content after high-temperature aerobic fermentation treatment, and the chemical fertilizer adopts urea with 46% nitrogen and P2O5. 57% and K2O 37% potassium polyphosphate, sludge accounts for 60% of the total weight, urea accounts for 25% of the total weight, and potassium polyphosphate accounts for 14.9% of the total weight. The water absorbing agent is a polymer water absorbing agent cross-linked polyacrylate. Powder, the water absorption capacity of the raw material is 600g water / g. The amount of water absorbing agent added is 0.1% of the total weight.

[0024] The production process is: the sludge is granulated by extrusion, and the fertilizer and water absorbent are crushed into powders below 30-100 mesh, and then the granular organic matter, fertilizer, water absorbent powder, etc...

Embodiment 2

[0026] The organic moisturizing fertilizer of the present invention is made by mixing organic matter, chemical fertilizer, and water absorbing agent to granulate. The organic matter has a water content of 25% after composting, 40% organic matter, and 6% effective nutrients (N+P2O5+K2O). Activated sludge, chemical fertilizers use 46% nitrogen urea, 18% P2O5 calcium magnesium phosphate fertilizer and K2O 10% silicon potassium fertilizer, which account for 50%, 20%, 15% and 14.98% of the total, respectively. Water absorbing agent is used. The polymer water absorbing agent cross-linked polyacrylate powder has a water absorption capacity of 650 g water / g for the raw material, and the addition amount of the water absorbing agent is 0.02% of the total weight. The organic matter content of the fertilizer is 20%, and the total effective nutrient (N+P2O5+K2O) is 16%, which meets the national organic compound fertilizer quality standard.

[0027] The production process is: the activated slud...

Embodiment 3

[0029]The inorganic moisture-retaining compound fertilizer of the present invention is made by mixing chemical fertilizers and water-absorbing agents. The chemical fertilizers use 46% nitrogen-containing urea, 18% P2O5 calcium-magnesium phosphate fertilizer and K2O 10% silicon-potassium fertilizer, which respectively account for 30% of the total. %, 35% and 34.98%, the water absorbing agent adopts the polymer water absorbing agent cross-linked polyacrylate powder, the water absorption capacity of the raw material is 350g water / g, and the addition amount of the water absorbing agent is 0.02% of the total weight. The fertilizer meets the national quality standard for compound fertilizer.

[0030] The production process is: crushing fertilizer and water absorbing agent into powders below 30-100 mesh, and then granulating the fertilizer and water absorbing agent powder in a disc granulator, sieving, and packaging to become products.

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Abstract

A soil moisture preserving inorganic-organic compound fertilizer is prepared from organic fertilizer, chemical fertilizer and high-molecular water absorbent through granulating the organic fertilizer and waste, mixing with powdered chemical fertilizer and water absorbent, granulating, sieving and packing.

Description

Technical field [0001] The invention relates to a compound fertilizer, in particular to a compound fertilizer with moisture-retaining and drought-resistant functions. Background technique [0002] Compound fertilizer is a kind of high-efficiency fertilizer commonly used in agricultural production. Existing commercial compound fertilizers are mostly produced by drying and granulating technology. For example, the patent publication number is CN1323765A, which is dried by hot air at a temperature of 120-150°C. This production method consumes a lot of energy, and also loses nutrients such as ammonia nitrogen during the drying process, and the yield is relatively low. [0003] The patent application with publication number CN1361090A proposes a compound fertilizer with moisture-retaining and drought-resistant function composed of chemical fertilizer and polymer water absorbing agent. Since the fertilizer used contains fertilizer that can dissolve in water to form ions, the water absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C05D9/00C05G1/00C05G3/00C05G5/00
Inventor 黄卫东张鹏陶明清俞汉青钱进吴金荣
Owner UNIV OF SCI & TECH OF CHINA
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