• 제목/요약/키워드: fluorspar

검색결과 4건 처리시간 0.021초

산화철계 형석대체제의 전로 정련특성 (BOF Refining of Fluorspar Substitute Using Iron Oxide Based By-product)

  • 금창훈;허보영
    • 한국재료학회지
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    • 제16권5호
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    • pp.336-340
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    • 2006
  • Fluorspar has been essential flux in steelmaking process. The main effects of fluorspar addition are lowering of the viscosity and melting temperature of slag. In recent years, due to the increasing price and environmental problem of fluorspar, various types of fluorspar substitute have been investigated. In this study, iron oxide by-products such as sinter dust, basic oxygen furnace (BOF) sludge and mill scale were developed as a substitute in terms of waste recycling. Several plant trials were carried out by addition of briquetted substitutes of $4{\sim}6$ kg/ton to compare with the fluorspar of $0.7{\sim}1$ kg/ton. The substitutes showed a similar behavior of slag formation, phosphorus removal and MgO saturation content.

고품위 형석의 신속 용량법 (Rapid Volumetric Assay of Fluorspar Concentrate)

  • 최규원;오준석;이광우
    • 대한화학회지
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    • 제8권3호
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    • pp.109-112
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    • 1964
  • A volumetric method of the determination of calcium carbonate and calcium fluoride in fluorspar concentrate is described. The carbonate is converted into solution by treatment of the sample in HNO$_3$-acetone (l% by volume) mixture, and the fluoride by treating the residue with H$_3BO_3$-HCl mixture. The calcium in the solution is determined volumetrically using EDTA standard solution. The selective dissolution of calcium carbonate by HNO$_3$-acetone mixture is superior to Bidtel's acetic method and little correction for the dissolution of calcium fluoride is needed. Triethanolamine is found to be superior to KCN in masking heavy metal ions.

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슬래그 엔지니어링에 의한 製銃 및 제강조업의 효율향상에 관한 연구 (Development of Iron and Steelmaking Processes by Slag Engineering Technology)

  • 박주현;민동준;송효석
    • 자원리싸이클링
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    • 제10권3호
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    • pp.37-42
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    • 2001
  • 21세기 철강산업에 요구되는 경제성, 환경친화성, 고효율성을 동시에 만족하는 슬래그 정련조업 조건을 슬래그 엔지니어링 개념에 입각하여 평가하였다. 제선 공정의 경우, 기존의 슬래그 조성에서 염기도를 증가시킴으로써 우수한 로내 통액성 및 향상된 용선품질 확보가 가능할 것으로 평가되었으며, COREX 조업에서는 ($SiO_2$+ $A1_2$$O_3$) 농도를 소량 감소시킴으로써 보다 우수한 유동성 및 정련능 확보가 가능한 것으로 예측되었다. 한편, Stainless Steel-AOD공정의 경우, 소량의 CaO농도 증가를 통하여 현재보다 양호한 정련능 확보가 가능함을 알 수 있었으며, 슬래그 중 (CaO+$A1_2$$O_3$)농도 증가를 통해 $CaF_2$의 사용량 감소를 이룩할 수 있을 것으로 예측되었다.

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유리용해로 가스처리 건식 Bag Filter의 개선에 관한 연구 (A Study on the Improvement of Dry Bag Filter Treatment System Regarding harmful gas of Glass Recuperator)

  • 이성진;서만철
    • 환경위생공학
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    • 제23권3호
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    • pp.9-22
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    • 2008
  • This study was conducted to develop a system that processes harmful gases and dust, which being generated in the production of micro-inorganic fabric. This can be obtained by melt spinning raw materials such as agalmatolite, fluorspar, limestone, silica under high temperature at $1500-1600^{\circ}C$ in a glass recuperator using a dry method by Cyclone Reactor or Envelope Type (ET) type Bag Filter. If the number of the members of Korea Glass Industry Association reaches up to 45, the damage of the harmful gas being generated in recuperator should not be small. In addition, research of existing facilities showed the most of harmful gas treatment facilities which adopt wet treatment or semi-dry treatment process. This was caused the problems for wastewater and the second pollutive materials. Moreover, in the dust collecting facility behind recuperator, it is also problematic that electric dust collector requires enormous initial investment. We have researched various methods to show both economic and efficient new processes for the preventive facilities of recuperator. As the result of the experiments, the removal efficiencies of HF and SOx were 99% and 87%, respectively. Although it was insignificant reaction, a pretty much interesting result that NOx showed an absorption reaction with $Ca(OH)_2$(removal efficiency was more than 25%) was obtained.