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Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate

A granular fertilizer and surface treatment technology, applied in ammonium nitrate fertilizer, nitrogen fertilizer, fertilization device and other directions, can solve problems such as being unfavorable for large-scale production of granular ammonium nitrate, inconvenient to obtain solid granular fertilizer, inconvenient to transport solid antiknock agent, etc. , to achieve the effect of significant anti-knock effect, strong water absorption performance and low price

Inactive Publication Date: 2013-04-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of a large amount of anti-knock agent makes it difficult to cool the slurry-like material in time during the falling process, and it is not convenient to obtain solid granular fertilizer; the melting point of ammonium nitrate is 169.9°C, and the addition of anti-knock agent will easily cause the ammonium nitrate melt to cool and precipitate crystals. Then block the granulation nozzle, which is not conducive to the continuous large-scale production of granular ammonium nitrate; the height of the ammonium nitrate granulation tower is tens of meters, and it is extremely inconvenient to transport the solid antiknock agent to the top of the tower
Therefore, it is more difficult to implement the production process of adding antiknock agent to the ammonium nitrate melt, and it is more difficult for the ammonium nitrate prilling tower with an effective height below 60 meters

Method used

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  • Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate
  • Surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material ratio is:

[0028] Pure granular ammonium nitrate: 80%; binder: a mixture of urea and sulfuric acid, 12.5%; curing agent: calcium carbonate, 5%; dusting agent: talcum powder, 2.5%.

[0029] The antiknock modified surface treatment of granular ammonium nitrate includes the following steps:

[0030] 1. Preparation of binder: Add 12.2g of water and 100g of concentrated sulfuric acid with a concentration of 98% in sequence in a 500ml glass reactor, start stirring, add 600g of urea evenly and slowly, control the heating rate, and make the temperature of the material in the reactor The maximum temperature should not exceed 130°C, and keep warm at 110°C-120°C to make it in a liquid state for later use. The molar ratio of urea to sulfuric acid is 10:1, and the moisture content in the binder is 2%;

[0031] 2. Heat 2000g of granular ammonium nitrate and a glass bottle with a volume of 2L in an oven at 70°C to 75°C and keep it warm for 1 hour, and set aside;

[003...

Embodiment 2

[0039] Raw material ratio is:

[0040] Pure granular ammonium nitrate: 50%; binder: a mixture of urea and sulfuric acid, 20%; curing agent: potassium carbonate, 17.5%; dusting agent: ammonium dihydrogen phosphate, 12.5%.

[0041] The antiknock modified surface treatment of granular ammonium nitrate includes the following steps:

[0042] 1. Preparation of binder: Add 50g of concentrated sulfuric acid with a concentration of 98% into a 500ml glass reactor, start stirring, add 200g of urea evenly and slowly, and control the heating rate so that the maximum temperature of the material in the reactor does not exceed 130°C , after the urea is completely dissolved, add 50g of oleum and 200g of urea in turn, keep warm at 110°C-120°C, make it in a liquid state for later use, the above ratio, the molar ratio of urea to sulfuric acid is 6.6:1, bonding The moisture content in the agent is 0.2%;

[0043] 2, the insulation of granular ammonium nitrate and glass bottle is with embodiment 1...

Embodiment 3

[0053] Raw material ratio is:

[0054] Pure granular ammonium nitrate: 85%; binder: a mixture of urea and sulfuric acid, 10%; curing agent: magnesium carbonate, 5%.

[0055] The antiknock modified surface treatment of granular ammonium nitrate includes the following steps:

[0056] 1, the preparation of binding agent: with embodiment 1;

[0057] 2, the insulation of granular ammonium nitrate and glass bottle is with embodiment 1;

[0058] 3. Weigh 200g of the binder prepared in step 1 and 1700g of granular ammonium nitrate at a temperature of 70°C to 75°C and pour them into an insulated 2L glass bottle in turn, and mix evenly so that the surface of the granular ammonium nitrate is evenly coated with a layer of sticky Binder;

[0059] 4. Weigh 100g of magnesium carbonate powder and pour it into the glass bottle of step 3, so that it is evenly mixed with the granular ammonium nitrate coated with binder, and the antiknock modified surface treatment of the granular ammonium nit...

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Abstract

The invention discloses a surface treatment method for antiknocking and modifying granulated fertilizer containing ammonium nitrate. In the method, firstly, fused ammonium nitrate is granulated by a tower top to obtain the granulated fertilizer containing the ammonium nitrate, then the surface of the granulated fertilizer is coated with a liquid binding agent, and finally, the granulated fertilizer is coated and enwrapped with solid powder consisting of firming agent and powdering agent, so that the surface treatment for antiknocking and modifying the granulated fertilizer containing the ammonium nitrate is finished. Under the interaction of the binding agent, the firming agent and the powdering agent, the invention improves the antiknock performance of agricultural ammonium nitrate greatly to achieve the requirement of the standard of WJ-9050-2006 agricultural ammonium nitrate antiknock performance test method and judgement. The granulated fertilizer containing the ammonium nitrate is subject to the antiknocking and modifying surface treatment after the fused ammonium nitrate is granulated, thereby causing no influence on the matured ammonium nitrate granulating technology, not reducing the production capacity of an ammonium nitrate prilling tower and causing no potential safety hazard.

Description

technical field [0001] The invention belongs to the antiknock technology of ammonium nitrate, in particular to a surface treatment method for antiknock modification of granular fertilizer containing ammonium nitrate. Background technique [0002] Ammonium nitrate is a substance with weak oxidizing properties. It has explosive properties after being simply mixed with an appropriate combustible agent. It is one of the main raw materials for industrial explosives; its molecular structure contains ammonium nitrogen with negative 3 valence and positive 5 valent Nitrate nitrogen can meet the nutrient requirements of crops in different growth periods, so it is also a high-quality nitrogen fertilizer, which has been widely used in agriculture. If criminals use ammonium nitrate as fertilizer to make explosives, it will bring serious safety hazards to the society. Therefore, the Chinese government promulgated and implemented the mandatory standard WJ-9050-2006 "Anti-knock performance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05C1/02
Inventor 唐双凌刘大斌倪欧琪王志敏章文义闫秀华
Owner NANJING UNIV OF SCI & TECH
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