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Qiu Yan – One of the best experts on this subject based on the ideXlab platform.
Failure Analysis of Ball Valve Made of Stainless Steel in Ammonium Phosphate Solution, 2008Co-Authors: Qiu YanAbstract:
The macro appearance,morphology and metallographic structure of ball valve which was made of stainless steel and failed in Ammonium Phosphate solution,were observed by metallographic microscopy and scanning electron microscopy(SEM).Also,photoelectronic direct reading spectrometer,energy dispersive spectrometer(EDS),carbon and sulfur analyzer and NHO-analyzer were also used to analyze the chemical composition of the substance and particles deposited on sealing area.The failure of ball valve was caused by electrochemical corrosion and scaling resulted from interaction of inferior materials and environmental medium.The corrosion mechanisms of stainless steel in Ammonium Phosphate solution were addressed and countermeasures for solving the problem were proposed as well.
Failure Analysis of Stainless Steel Gate Valve in Ammonium Phosphate SolutionHeat Treatment of Metals, 2007Co-Authors: Qiu YanAbstract:
The macro appearance,morphology and metallographic structure of stainless steel gate valve leaked in Ammonium Phosphate solution were observed by metallurgical microscope and scanning electron microscope (SEM). The photoelectric direct reading spectrometer,X-Ray fluorescence spectrometer and NHO-analyzer were used to analyze chemical composition of materials and particles deposited on the disc.The results show that the failure of gate valve is caused by electrochemical corrosion and scaling because of the wrong material and environment medium.Moreover,countermeasures are put forwarded on the research basis.
Yongyou Hu – One of the best experts on this subject based on the ideXlab platform.
recovery of phosphorus and nitrogen from alkaline hydrolysis supernatant of excess sludge by magnesium Ammonium PhosphateBioresource Technology, 2014Co-Authors: Wei Bi, Yiyong Li, Yongyou HuAbstract:
Abstract Magnesium Ammonium Phosphate (MAP) method was used to recover orthoPhosphate (PO43−-P) and Ammonium nitrogen (NH4+-N) from the alkaline hydrolysis supernatant of excess sludge. To reduce alkali consumption and decrease the pH of the supernatant, two-stage alkaline hydrolysis process (TSAHP) was designed. The results showed that the release efficiencies of PO43−-P and NH4+-N were 41.96% and 7.78%, respectively, and the pH of the supernatant was below 10.5 under the running conditions with initial pH of 13, volume ratio (sludge dosage/water dosage) of 1.75 in second-stage alkaline hydrolysis reactor, 20 g/L of sludge concentration in first-stage alkaline hydrolysis reactor. The order of parameters influencing MAP reaction was analyzed and the optimized conditions of MAP reaction were predicted through the response surface methodology. The recovery rates of PO43−-P and NH4+-N were 46.88% and 16.54%, respectively under the optimized conditions of Mg/P of 1.8, pH 9.7 and reaction time of 15 min.
Li Run-xi – One of the best experts on this subject based on the ideXlab platform.
Preparation of Superfine Ammonium Phosphate Dry Chemical Fire Extinguishing Agent by Using Vibratory Milling Method and Surface ModificationJournal of North University of China, 2011Co-Authors: Li Run-xiAbstract:
By using the vibratory milling method and adding abrasive,superfine powder of Ammonium Phosphate was produced from the Ammonium Phosphate dry powder.The superfine Ammonium Phosphate dry chemical fire extinguishing agent,of which the average diameter was 4.12 μm and the average specific surface area was 880.43 m2/kg,was produced through the special surface modification by using the hydric cymene silicon oil in the mixing equipment.The fire extinguishing agent featured better hydrophobicity.It was anti-caking,and its moisture adsorption rate was 1.7%.The anti-agglomeration was 30.5 mm(by penetration degree).The experiments showed that the ejection rate was 98.7%,the ejection time was 10 s,the fire extinguishing time was 3 s,and the average fire extinguishing quantity was 60 g/m3.