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(AN nitric acid) Compatibility of nitro compound fertilizers?

2008-11-10View Original

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This post was last edited by lxq700918 on 2010-8-28 09:20. Nitrate AN has good compatibility with ammonium phosphate, diammonium phosphate, and potassium sulfate. Mixing nitric acid with superphosphate results in the formation of calcium nitrate, which deteriorates the physical properties of the compound fertilizer; therefore, the product needs to be modified. NitroAN must never be mixed with urea to produce solid compound fertilizers. Due to the \"cigar burning\" effect of chloride ions, nitroAN and potassium chloride can only be mixed to a limited extent. What is the “cigar burning” effect of chloride ions? Why is that the case? I hope all the experts can help; thank you!
Reply #22010-02-25
The instructions are on the webpage http://www.cncrf.com/newsDetail.asp?id=235; I can’t paste them here as it says, “Sorry, the content you entered (such as signatures, posts, messages, etc.) contains inappropriate material and cannot be submitted. Please make the changes.” ”, depressed
Reply #32010-07-13
Warning on the Dangers of Nitrate Compound Fertilizers Date: 1-25-2007 Author: Compiled by Liao Zhaoyuan Source: Internet The main raw material for nitrate nitrogen is **, and it is well known that it can be used as **. When it was detonated by fire or other hazards, some catastrophic ** incidents occurred. These misfortunes have led to strict restrictions on the manufacturing, transportation, storage, and use of fertilizers for such purposes. Some **are prohibited from being sold** directly as fertilizer. What is allowed to be sold in these ** are mixtures known as CAN and calcium carbonate; as for other **, strict quality specifications apply to those used as fertilizers. For example, as specified by the American Fertilizer Association for **solid fertilizers**, in addition to requiring a minimum nitrogen content of 33.0% and a pH value of at least 4 for 10% aqueous solutions, it is also stipulated that the carbon content must not exceed 0.20%, sulfur content must not exceed 0.10%, and chloride content, measured as chlorine, must not exceed 0.150%; fine particulate metal elements must be completely removed ; It is also required that the amount of hydrogen gas released from a 50g sample be at most 4.6 mL ; It also stipulates that **spreading tests and combustion tests must be conducted. Nitro compound fertilizers can have many formulations; some of them facilitate rapid decomposition, while others can prevent such reactions. Some compound fertilizers containing ** and chlorides tend to spread and decompose when on fire, a phenomenon known as \"cigar burning\". The ignition temperature is around 200°C, but this temperature can be reduced by a certain sensitizer (such as copper salts). The composition ranges of easily decomposable NPK compound fertilizers and NK compound fertilizers have been studied by Hagen and Peber et al., as well as by TVA (Tennessee Valley Authority) in the United States. Less than 4% potassium chloride (approximately equivalent to 1.9% chlorine) is sufficient to make certain mixtures sensitive to cigar burning. This reaction can be prevented by phosphoric acid; therefore, many nitrogen-phosphorus-potassium compound fertilizers that contain ammonium phosphate, **, and potassium chloride do not pose this risk. Since these nitro-fertilizer materials are sensitive to spontaneous decomposition, the reaction may be triggered by certain accidental events. For example, a piece of hot metal from a welding operation, an electric light bulb buried in a pile of materials, or solid material that has hardened into clumps on the scraper of a dryer can all cause such a reaction. Once the reaction is initiated, the decomposition spread affects a large amount of material, with the spread rate typically ranging from 5 to 50 cm/h. The temperature in the decomposition zone is usually 300~500°C. The exact nature of the reaction is not yet fully understood, but its result is **complete destruction along with the formation of certain chlorides, releasing red, white, yellow, and brown fumes containing NH4Cl, HCl, Cl2, NO2, and other nitrogen oxides. These fumes are toxic and have caused deaths in several accidental incidents. Since the reaction does not require oxygen, once it has started or cannot be extinguished by suffocation, it can only be stopped by flooding it with water. If the exact location of the affected area within the batch or pile can be identified early, the decomposing material can be removed using an electric shovel and extinguished with water, thus protecting the remaining material. Due to the potential for progressive decomposition and **hazardous reactions associated with nitrate-based compound fertilizers, if such fertilizers contain nitrate nitrogen, it is necessary to indicate “Contains nitrate nitrogen” on the packaging as a warning.
Reply #42010-08-26
The “cigar burning” effect of chloride ions? Why is that the case? A redox reaction occurs, releasing a large amount of heat instantly, which leads to an explosion
Reply #52010-09-13
I’ve learned it, I know. Thank you
Reply #62010-09-14
Our company intends to use ammonium phosphate, potassium sulfate, and (molten) nitrate to produce nitrogen-based compound fertilizers with a total nutrient content of over 40%. Will this not cause a \"cigar burning\" effect?
Reply #72010-09-15
You have monoammonium phosphate here, so it should not cause a \"cigar burning\" effect

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