熔成燐肥用苦土系耐火物の研究熔成燐肥用耐火物に関する研究 (第2報)

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Various kinds of refractories, such as chromite, chromite-magnesia, magnesia-chromite, forsterite, alumina, magnesia, spinel, dolomite, etc., were collected and tested for making calcium-magnesium phosphatic fertilizers. The experiments showed that refractories for fused phosphatic fertilizers must be basic and very compact. The present authors tried to make compact magnesian refractories by adding alumina and lime. In this case, molectlar ratio CaO/Al2O3 must be larger than 3:1 or smaller than 3:5. Magnesite, bauxite and dolomite were mixed in such ratio 3:1:0, 2.7:1:0.3 or 2.5:0.1:0.4 and fired at 1450°C for 1 hour. The physical properties of these prepared refractory specimens were fully examined, and also the corrosion test by the fused phosphatic fertilizer was carried out with good results.
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