I would like to ask about the impact of N on phosphate ammonium products?
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In recent production, the neutralization degree of phosphoric ammonium has been raised to over 1.50, yet the nitrogen content of the product remains below 13. I would like to ask what factors are responsible for this? We produce 57% diammonium phosphate. Previously, when the secondary neutralization degree was kept around 1.40–1.45, the nitrogen content in the product exceeded 13%. 1. Identify and analyze the causes. 2. The acceptable level of sulfur trioxide in the liquid phase of phosphoric acid is between 0.03–0.035 mg/l. 3. I suspect that there may be an excess of metal ions in the phosphate ore (magnesium, potassium, sodium, calcium), but scaling in the phosphoric acid system is not severe.
Hehe, I have a weak question: what does \"neutralization degree\" mean?
Hehe, I have a weak question: what does \"neutralization degree\" mean?
Reply to 4# Snow Flying NH3/P2O5
Reply to 1# Snow Flying: 1. Identify and analyze the causes ； (Understood) 2. The acceptable range for liquid-phase sulfur trioxide in phosphoric acid is between 0.03–0.035 mg/l ； (Is the acceptable range for liquid-phase sulfur trioxide in phosphoric acid between 0.03–0.035 mg/l? Is this the parameter that you are responsible for controlling?) Is the recent test value for phosphoric acid still between 0.03–0.035 mg/l? 3. Personally, I think there are too many metal ions in the phosphate rock (magnesium, potassium, sodium, calcium), but scaling in the phosphate system is not severe. (The analysis may not be accurate; you can send specific phosphate rock data to SFLS663007@126.com to assist with the analysis. It’s not possible to observe changes in the short term – the process of buildup can occur either quickly or slowly.) http://www.xn--nww98a05s6qz.com
Pay more attention to the temperatures at the head and tail of the ammonium phosphate granulation kiln; in particular, the temperature of the shaking mechanism should not be too high, otherwise diammonium phosphate may decompose and lead to N loss.
Ugh, our 57dap product contains more than 17.5% of N – it’s difficult even to reduce that amount. The amount of cations in your product is probably extremely high
There are actually quite a few reasons, such as the impurity content, mainly magnesium and aluminum, as well as the solid phase content of concentrated phosphoric acid.