KR950017741A - Method for Preparing Lepidodo Crocite - Google Patents

Method for Preparing Lepidodo Crocite Download PDF

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Publication number
KR950017741A
KR950017741A KR1019930028500A KR930028500A KR950017741A KR 950017741 A KR950017741 A KR 950017741A KR 1019930028500 A KR1019930028500 A KR 1019930028500A KR 930028500 A KR930028500 A KR 930028500A KR 950017741 A KR950017741 A KR 950017741A
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South Korea
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reaction
stage reaction
increase rate
redox potential
crystal growth
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KR1019930028500A
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Korean (ko)
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KR960010092B1 (en
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김대영
변태봉
손진군
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조말수
포항종합제철 주식회사
백덕현
재단법인산업과학기술연구소
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Priority to KR1019930028500A priority Critical patent/KR960010092B1/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/02—Oxides; Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/20—Powder free flowing behaviour
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Iron (AREA)

Abstract

본 발명은 오디오, 비디오등 자기기록매체용 자성산화철의 출발원료로 적합한 페피도크로사이트의 제조방법에 관한 것으로써, 종래방법에 비하여 제조시간이 훨씬 단축될 뿐만 아니라 입도분포가 균일하고, 분산성이 양호하고, 자기적 특성이 우수한 레피도 크로사이트를 보다 경제적으로 제조하고자 하는데, 그 목적이 있다.The present invention relates to a method for producing pepidocrocite suitable as a starting material for magnetic iron oxides for magnetic recording media such as audio and video, which not only shortens the manufacturing time but also has a uniform particle size distribution and dispersibility. The purpose of the present invention is to produce lepido crocite which is good and has excellent magnetic properties more economically.

본 발명은 염화제1철 수용액에 알카리를 당량이하로 첨가하여 수산화제1철을 제조한 다음, 산회시켜 레피도크로사이트 종결정을 합성한 후 결정성장반응을 진행시키는 습식산화반응에 의해 레피도크로사이트를 제조하는 방법에 있어서, 레피도크로서이트 종결정 생성반응을 제1단계반응, 결정성장반응의 전반을 제2단계반응, 그리고 결정성장반응의 후반을 제3단계반응으로 전체반응을 3단계로 구분하고; 제1단계반응에서 산화환원 전위증가속도를 15-90mV/min으로 하고, 제2단계반응에서 산화환원 전위증가 속도를 2.5-7.5mV/min으로 하고, 그리고 제3단계반응에서 산화환원전위증가속도를 1.0-2.0mV/min으로 조절하는 것을 특징으로 하는 레피도크로사이트의 제조방법을 그 요지로 한다.The present invention is to prepare ferrous hydroxide by adding alkali to the ferric chloride aqueous solution below the equivalent weight, and then the acid by the oxidation to synthesize the repidocrosite seed crystals by wet oxidation reaction to proceed the crystal growth reaction In the method for producing crosite, the reaction of lepidocroth seed crystal formation is performed in the first stage reaction, the first half of the crystal growth reaction in the second stage reaction, and the second half of the crystal growth reaction in the third stage reaction. Divided into stages; The redox potential increase rate is 15-90 mV / min in the first stage reaction, the redox potential increase rate is 2.5-7.5 mV / min in the second stage reaction, and the redox potential increase rate is 1.0 in the third stage reaction. Summary of the Invention The method for producing lepidocrocite, which is controlled at -2.0 mV / min, is the main point.

Description

레피도 크로사이트의 제조방법Method for Preparing Lepidodo Crocite

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제 1 도 제 1 단계 반응에 있어 산화환원전위의 증가속도를 달리하여 제조된 입자의 전자현미경 사진.1 is an electron micrograph of particles prepared by varying the rate of increase of the redox potential in the first step reaction.

제 2 도는 제 2 단계 반응에 있어 산화환원전위의 증가속도를 달리하여 제조된 입자의 전자현미경 사진.2 is an electron micrograph of particles prepared by varying the rate of increase of the redox potential in the second step reaction.

제 3 도는 제 2 단계 반응에 있어 산화환원전위의 증가속도를 달리하여 제조된 입자의 전자현미경 사진.3 is an electron micrograph of particles prepared by varying the rate of increase of the redox potential in the second step reaction.

Claims (1)

염화 제 1 철 수용액에 알카리를 당량 이하로 첨가하여 수산화 제 1 철을 제조한 다음, 산화시켜 레피도 크로사이트 종결정을 합성한 후 결정 성장 반응을 진행시키는 습식산화반응에 의해 레피도 크로사이트를 제조하는 방법에 있어서, 레피도 크로사이트 종결정 생성반응을 제 1 단계 반응, 결정성장반응의 전반을 제 2 단계 반응, 그리고 결정성장반응의 후반을 제 3 단계 반응으로 전체반응을 3단계로 구분하고; 제 1 단계 반응에서 산화환원전위 증가속도를 15~90mV/min으로 하고, 제 2 단계 반응에서 산화환원전위 증가속도를 2.5~7.5mV/min으로 하고, 그리고 제 3 단계 반응에서 산화환원전위 증가속도를 1.0~2.0mV/min으로 조절하는 것을 특징으로 하는 레피도 크로사이트의 제조방법.To prepare ferric hydroxide by adding alkali to the ferric chloride aqueous solution in an equivalent amount or less, and then oxidizing to synthesize the repido crocite seed crystals, the repido crocite was reacted by a wet oxidation reaction to proceed the crystal growth reaction. In the manufacturing method, the redodo crocite seed crystal formation reaction is divided into three stages: the first stage reaction, the first half of the crystal growth reaction, the second stage reaction, and the second half of the crystal growth reaction. and; The redox potential increase rate is 15-90 mV / min in the first stage reaction, the redox potential increase rate is 2.5-7.5 mV / min in the second stage reaction, and the redox potential increase rate is increased in the third stage reaction. Method for producing a lepido crosight, characterized in that to adjust to 1.0 ~ 2.0mV / min. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930028500A 1993-12-18 1993-12-18 Process for the preparation of lepidocrosite KR960010092B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930028500A KR960010092B1 (en) 1993-12-18 1993-12-18 Process for the preparation of lepidocrosite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930028500A KR960010092B1 (en) 1993-12-18 1993-12-18 Process for the preparation of lepidocrosite

Publications (2)

Publication Number Publication Date
KR950017741A true KR950017741A (en) 1995-07-20
KR960010092B1 KR960010092B1 (en) 1996-07-25

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KR960010092B1 (en) 1996-07-25

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