Background and overview[1]
Magnesium pyrophosphate is colorless crystal or white powder. Specific gravity 2.559. Melting point 1,383°C. Insoluble in water and ethanol, soluble in acid. Trihydrate loses crystal water at 100°C. It is derived from the thermal decomposition of magnesium ammonium phosphate.
Related research reports[2]
In view of the problem of magnesium pyrophosphate being generated during the pyrolysis of magnesium ammonium phosphate, Li Haibo and others conducted a study on the acidolysis of magnesium pyrophosphate in the pyrolysis product, and investigated the effects of pH value, temperature, reaction time, etc. on magnesium pyrophosphate acid. Through the influence of solution behavior, the transformation rules of pyrophosphate to orthophosphate were obtained. Research shows that acid hydrolysis can effectively convert magnesium pyrophosphate that does not have the ability to precipitate ammonia nitrogen into magnesium phosphate that has an efficient precipitating effect on ammonia nitrogen, thereby realizing the recycling of magnesium ammonium phosphate. The study also examined the ammonia nitrogen precipitation performance of the acid hydrolysis product, including the effects of pH value, dosage, etc. on the ammonia nitrogen precipitation performance. Research results show that under appropriate pyrolysis and acidolysis conditions, magnesium ammonium phosphate can still achieve more than 90% ammonia nitrogen removal performance after being recycled five times.
Apply[3-4]
Application 1,
CN201711294725.6 discloses a corrosion-resistant composite material, including the following raw materials in parts by weight: 60-100 parts of polyvinyl chloride, 10-15 parts of n-bromopropane, 7-12 parts of erucamide, lauroyl 6-13 parts of ethanolamine, 8-15 parts of magnesium pyrophosphate, 2-8 parts of nano titanium dioxide. The composite material of the present invention can achieve excellent wear-resistant effect, has good wear-resistant strength, meets the requirements of sewage pipelines, and has good economic value and social value.
Application 2,
CN201610630491.7 discloses an ultra-high vapor pressure aerated ceramsite concrete and its manufacturing process, which consists of the following components in proportion by weight: pure water, mortar, (copper sulfate-ferric nitrate-chloride Zinc-tin oxide) chelate, calcium sulfate (CaSO4), magnesium borate, fly ash, silica, quicklime, rubidium nanoparticles, citric acid, magnesium pyrophosphate, desulfurized lead and zinc Tailings powder, tris(2-toluene)phosphate, HBS lignin, ceramsite. The advantages of this invention are: it can digest tailings, reduce pollution, turn waste into treasure, and reduce the production cost of aerated concrete; it can take into account light weight and high strength, thermal insulation, impermeability and waterproofing, fire and flame retardancy, sound insulation and noise reduction, It is green, environmentally friendly, convenient to construct, durable, economical and practical; it has the advantages of fast construction speed, little restriction by climatic conditions, saving labor force, effectively shortening the construction period, saving construction costs, and improving construction quality.
