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Multicompentnt granular urea and its production process

A technology of granular urea and production method, which is applied in the direction of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problem of single urea fertilizer, and achieve the effect of good fertilizer efficiency, uniform particles, and good absorption

Inactive Publication Date: 2002-07-10
黑龙江黑化集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the single deficiency of the current urea fertilizer. After long-term development research, crop fertilizer efficiency investigation and production practice, a kind of urea fertilizer rich in calcium, magnesium, sulfur and other nutrients is developed and provided. The production process is simple, easy to operate, and low cost. Low-cost, multi-component granular urea with wide application and production method thereof

Method used

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  • Multicompentnt granular urea and its production process
  • Multicompentnt granular urea and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The aqueous urea solution is evaporated in one stage and two stages, concentrated to a concentration of 99.0-99.7% (weight) by vacuum evaporation at a temperature of 135--140° C., and pumped from the molten urea to the mixer on the tower through the separator 6.

[0031] 2. Preheat the powdery dry ammonium sulfate crystals and dolomite to 135°C respectively through the preheating equipment, and send them to the high-level tank for solid materials on the tower (5 1 , 5 2 ), and then quantitatively feed into the mixer by the rotary feed valve.

[0032] 3. In the mixer, ammonium sulfate crystals, dolomite and urea melt are fully mixed, and the mixing ratio is: 70% (weight) urea solution, 20% (weight) ammonium sulfate crystals, 10% (weight) dolomite, while heating While stirring, a mixed dissolved salt was obtained.

[0033] 4. At 135-140°C, the mixed molten salt is quickly sent to the granulation nozzle 8 in the granulation tower 9 to spray down, and it is in reverse ...

Embodiment 2

[0036] 1. The aqueous urea solution is evaporated in one stage and two stages, concentrated to a concentration of 99.0-99.7% (weight) by vacuum evaporation at a temperature of 135--140° C., and pumped from the melted urea to the mixer on the tower through the separator 6.

[0037] 2. Preheat the powdery dry ammonium sulfate and dolomite to 140°C through the preheating equipment, and send them directly to the mixer on the tower.

[0038] 3. In the mixer, ammonium sulfate, dolomite and urea melt are fully mixed, and the mixing ratio is: 70% (weight) urea solution, 10% (weight) ammonium sulfate crystal, 20% (weight) dolomite, while heating Stir to obtain mixed molten salt.

[0039] 4. At 135-140°C, the mixed molten salt is quickly sent to the prilling tower 9 for granulation and spraying down, and is in reverse contact with the cold air in the tower, and is cooled to 100°C to crystallize into large-grained products.

[0040] 5. The large particle product that is preliminarily co...

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Abstract

The multicomponent granular urea contains urea 60-80 wt%, ammonium sulfate 10-20 wt% and dolomite 10-20 wt% and has grain size of 2-4 mm. The production process includes evaporation of urea solution, preheating of ammonium sulfate and dolomite, mixing, granulation, cooling and packing. the multicomponnet granular urea can introduce S, Mg and Ca elements for the growth of crop while providing urea component, regulate soil nutrients and raise crop yield. It has delayed release function and high fertilizer effect.

Description

technical field [0001] The invention relates to a novel agricultural chemical fertilizer urea, in particular to multi-component granular urea containing calcium, magnesium and sulfur and a production method thereof. technical background [0002] At present, agricultural chemical fertilizers are mainly based on nitrogen, phosphorus and potassium fertilizers required for plant growth. Among them, nitrogen fertilizers, especially urea, are the main fertilizers, replacing ammonium sulfate that has been used in the past, and there is an increasing trend. Farmers prefer to use urea It is very common. Although urea is a fast-acting nitrogen fertilizer, which can make crops grow vigorously and increase production significantly, urea is a single nitrogen-containing fertilizer that does not contain nutrients needed by other crops. The fertilizer is single, small in size, poor in strength, and easy to condense The cost is high. Due to the long-term use of single urea fertilizer, the nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G5/00
Inventor 阎树忠朱宪荣柏安龙王瑜赵振华阎春波杨君孙启坡
Owner 黑龙江黑化集团有限公司
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