응집침전에 의한 제철공장 냉각수질향상 (Improvement of Cooling Water Quality by Coagulation and Sedimentation in Steel Mill)

서지정보

· 발행기관 : 한국환경보건학회
· 수록지 정보 : 한국환경보건학회지 / 35권 / 5호 / 411 ~ 416페이지
· 저자명 : 조관형, 우달식, 황병기, 박덕원, 이선주

초록

This study was initiated to improve the cooling water quality by chemical coagulation and sedimentation in steel mills.
Due to the inefficient flocculation in the settling tanks of blast furnace cooling water systems, the solid particles in the
cooling water overflow accumulate and clog the cooling system. To protect the cooling water system from such fouling,
proper flocculants must be continuously used. Laboratory tests were performed for the indirect cooling water system
of a plate mill. The batch test in the gas scrubbing cooling water system of a blast furnace showed that the proposed
coagulant was more effective for the improvement of coagulation and sedimentation than the existing one. During the
tests, cationic flocculants were more effective than use of only an anionic flocculant. The suggested combination of
anionic and cationic flocculants can probably improve the turbidity removal efficiency of the cooling water. Proper control
of the overflow rate by the designed residence time would help turbidity removal efficiency in the settling tank. In
addition, the settling can be enhanced by adopting rapid and slow mixing alternatively. Scale problems in blast furnace
cooling water system were reduced to some extent by efficient settling.

영어초록

This study was initiated to improve the cooling water quality by chemical coagulation and sedimentation in steel mills.
Due to the inefficient flocculation in the settling tanks of blast furnace cooling water systems, the solid particles in the
cooling water overflow accumulate and clog the cooling system. To protect the cooling water system from such fouling,
proper flocculants must be continuously used. Laboratory tests were performed for the indirect cooling water system
of a plate mill. The batch test in the gas scrubbing cooling water system of a blast furnace showed that the proposed
coagulant was more effective for the improvement of coagulation and sedimentation than the existing one. During the
tests, cationic flocculants were more effective than use of only an anionic flocculant. The suggested combination of
anionic and cationic flocculants can probably improve the turbidity removal efficiency of the cooling water. Proper control
of the overflow rate by the designed residence time would help turbidity removal efficiency in the settling tank. In
addition, the settling can be enhanced by adopting rapid and slow mixing alternatively. Scale problems in blast furnace
cooling water system were reduced to some extent by efficient settling.

참고자료

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