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Vol.27, No.9, 800 ~ 808, 1989

Title

A Study on Fabrication of the magnetite Ink by Use of the Waste Pickling Liquor of Steel

차동득D . D . Cha, 이명재M . J . Lee, 설수덕S . D . Seul, 성명원N . W . Sung, 김영삼Y . S . Kim, 박세윤S . Y . Park

Abstract

This paper describes the results on the formation of magnetite particles to be used in making magnetic ink from the waste pickling liquor of steel which contains 8.9 wt.% of Fe ion (in which Fe²+ ion occupies 8.58wt.%) under conditions of pH 11, temperature of 80℃, air blowing rate of 100 cc/sec, and Fe^(2-)/Fe^(+3) ㏖-ratio of the waste pickling liquor being 0.5-27.1) Oxidation is easily proceeded in 200 g of waste liquor added with 1% HNO₃from Fe^(+2)+ ion to Fe^(+3) ion at 70℃ with air blowing rate of 100cc/sec. 2) Magnetite particles at Fe^(+2)/Fe^(+3) ㏖-ratio of 0.5-1.0 were of ultra-fine sizes less than 110 angstrom. They have magnetic susceptibility of 48-60 emu/g at 6kOe and showed super-paramagnetic characteristics and thus could be used in making magnetic ink. 3) It was possible to produce magnetic ink by coating the oleic acid on the surface of magnetize particles made from the waste pickling liquor of steel and dispersing them into kerosene oil.

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