혼련 후 20분 동안 구형화하여 분급과정을 통해서 0.3 내지 0.5 mm의 평균입도를 갖는 저감재를 수득하였다.
After kneading, it was spheroidized for 20 minutes to obtain a reducing material having an average particle size of 0.3 to 0.5 mm through a classification process.