熔成燐肥製造用特殊耐火物の研究-1-

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The corrosion tests of the special dolomite refractories against fused phosphate fertilizer (C. P. 20%) were made by the crucible method and fusion test of mixed cone. The crucibles have an inside diameter of 20mm, depth of 15mm and wall thickness of 5mm., were kept filled with fertilizer at 1400°C for 20 minutes, 1500°C for 2 hours and 1600-1640°C for I hour on the test run No. 1, 2 and 3 respectively.The thickness of the corrosion layers at flux line. were about 0.1, 0.7 and 2mm respectively. The penetration of the melt through the crucible walls of 5mm thickness were not observed in every cases. The results of the tests of mixed fusion were shown in Fig. 1.The results of these corrosion tests of the special dolomite refractories showed that these cheap and durable basic refractories have the possibility to be used as a furnace lining for manufacture of fused phosphate fertilizer.
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