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Technique for producing macroelement water-soluble fertilizer and coproducing slow-release fertilizer

A water-soluble fertilizer and a large amount of element technology, applied in the direction of fertilizer mixture, fertilization device, application, etc., can solve the problem of high production cost, achieve the effect of low production cost, less investment in equipment, and long-lasting fertilizer effect

Inactive Publication Date: 2013-03-20
江苏湛蓝科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem of high production cost of water-soluble fertilizers in the prior art, the present invention provides a process for producing water-soluble fertilizers (solid type) with a large amount of elements by wet-process phosphoric acid and co-producing slow-release fertilizers

Method used

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  • Technique for producing macroelement water-soluble fertilizer and coproducing slow-release fertilizer
  • Technique for producing macroelement water-soluble fertilizer and coproducing slow-release fertilizer
  • Technique for producing macroelement water-soluble fertilizer and coproducing slow-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The production process of slow-release fertilizer co-production of water-soluble fertilizer with a large number of elements

[0024] A. Start the phosphoric acid pump, put 6000L ω(P 2 o 5 ) 22% wet-process phosphoric acid into the reaction tank, and when the lower blade of the stirring paddle is submerged, start the stirring paddle.

[0025] B. Reduce the flow rate of phosphoric acid, slowly open the valve on the ammonia pipeline, and add ammonia to the reaction tank. The slurry with a neutralization degree of <0.9 is put into the ground tank, and after the production is normal, it is put into the reaction tank to continue neutralization. Measure the degree of neutralization every 5 minutes, adjust the flow rate of phosphoric acid and ammonia gas until the degree of neutralization reaches 0.9, and put the neutralized slurry into the feed tank.

[0026] C. Put the slurry in step B into a vacuum drum centrifuge with automatic discharge for separation, put th...

Embodiment 2

[0033] Example 2: The production process of slow-release fertilizer co-production of water-soluble fertilizer with a large number of elements

[0034] A. Start the phosphoric acid pump, put 6000L ω(P 2 o 5 ) 22% wet-process phosphoric acid into the reaction tank, and when the lower blade of the stirring paddle is submerged, start the stirring paddle.

[0035] B. Reduce the flow rate of phosphoric acid, slowly open the valve on the ammonia pipeline, and add ammonia to the reaction tank. The slurry with a neutralization degree of <0.9 is put into the ground tank, and after the production is normal, it is put into the reaction tank to continue neutralization. Measure the degree of neutralization every 5 minutes, adjust the flow rate of phosphoric acid and ammonia gas until the degree of neutralization reaches 0.9, and put the neutralized slurry into the feed tank.

[0036]C. Put the slurry in step B into a vacuum drum centrifuge with automatic discharge for separation, put the...

Embodiment 3

[0041] Embodiment 3: The water-soluble fertilizer produced by the production process of Embodiment 1 or 2 was carried out in field fertilizer effect test in Wuzhuang Village, Shanzuokou Township, Donghai County, Jiangsu Province

[0042] 1. Test material: a large amount of elemental water-soluble fertilizer produced by the production process of embodiment 1 or 2;

[0043] Potassium sulfate compound fertilizer (15-15-15).

[0044] 2. The tested crop: hot pepper

[0045] 3. Test soil: The soil of the test site is sandy loam with medium fertility.

[0046] 4. Test conditions:

[0047] Treatment A: 50kg of potassium sulfate compound fertilizer (15-15-15) was applied as base, 40% was sprinkled before soil preparation, and 60% was applied to the planting ditch.

[0048] Treatment B: no fertilization.

[0049] Treatment C: In addition to the fertilization of treatment A, water-soluble fertilizers with macroelements were sprayed once at the seedling stage, the initial flowering st...

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Abstract

The invention provides a technique for producing a macroelement water-soluble fertilizer and a coproducing slow-release fertilizer by a wet process, which comprises the following steps: introducing ammonia gas into wet-process phosphoric acid to carry out neutralization, and filtering the neutralized slurry with a vacuum-type drum filter to obtain a monoammonium phosphate clear solution and filter residues containing rich citrate-soluble phosphates; adding fertilizer, assistant and synergist into the monoammonium phosphate clear solution, evenly stirring and mixing, concentrating by flash evaporation, and carrying out spray drying to obtain the macroelement water-soluble fertilizer; and dissolving the filter residues in a citric acid solution, adding assistant to obtain a slow-release fertilizer coating solution, evenly spraying the slow-release fertilizer coating solution on the surface of the compound fertilizer, and spraying an anticaking agent on the surface of the compound fertilizer, thereby obtaining the excellent slow-release fertilizer. The technique has the advantages of low equipment investment, favorable raw material adaptability, low production cost and good product quality; and the products water-soluble fertilizer and slow-release fertilizer are hot-sale products, and have high application value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a production process for co-production of slow-release fertilizer with water-soluble fertilizer with a large number of elements. Background technique [0002] Water-soluble fertilizer with a large number of elements is a kind of multi-element all-water-soluble fertilizer that can be completely dissolved in water. It can be quickly dissolved in water and is more easily absorbed by crops. Moreover, its absorption and utilization rate is relatively high. It is a kind of fertilizer with comprehensive nutrition and high dosage. Quick-acting fertilizer with less and quick effect. The fertilizer is in the form of liquid or solid, and is dissolved or diluted in water during use. It can be used for irrigation and fertilization, foliar fertilization, soilless cultivation, soaking seeds and dipping roots, etc. In addition, with the large-scale application of high-conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/00C05G3/90
Inventor 马永飞王永翔孙西强鲁涛
Owner 江苏湛蓝科技开发有限公司
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