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1996 Fiscal Year Final Research Report Summary

Hydrothermal synthesis of alumino-silicate from coal ash

Research Project

Project/Area Number 07555324
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section試験
Research Field 資源開発工学
Research InstitutionTohoku University

Principal Investigator

MATSUOKA Isao  Tohoku Univ., Dept.of Geoscience and Technology, Professor, 工学部, 教授 (80005264)

Co-Investigator(Kenkyū-buntansha) NOZAWA Miki  Tohoku Univ., Dept.of Geoscience and Technology, Research Associate, 工学部, 助手 (60250718)
TOHJI Kazuyuki  Tohoku Univ., Dept.of Geoscience and Technology, Associate Professor, 工学部, 助教授 (10175474)
Project Period (FY) 1995 – 1996
KeywordsCoal ash / Hydrothemal synthesis / Kaolinite / Quartz / Alkaline treatment / 白色度 / 浮選 / 磁選
Research Abstract

The present project have been aimed at purification (flotation, magnetic separation) of fly ash and its hydrothermal treatment for synthesis of alumino-silicate as kaolinite.
Flotation Carbon removal of fly ash by flotation have been investigated with the aid of kerosene bridging between bubble and the carbonaceous particles. The results were discussed in relation with the results of zeta potential measurement or water/oil extraction on the fly ash particles. Effects of pH adjustment, comminution of feed and surfactant addition on the results were examined. Zeta potential measurements revealed that electrostatic interaction among carbonaceous or inorganic particles was found to be very small. Water/oil extraction indicated it was liophobicity of inorganic surface rather than of carbonaceous one that should be affected by pH : in alkaline condition metallic cations on the surface of fly ash should increase consumption of oil by inorganic particles.
Magnetic separation. Iron component in fly ash was removed in amount from 3.7% to 0.1% by dry magnetic separation. Analysis of separated samples with XRD and SEM-EDX indicated the magnetic components (mainly magnetite) should be conbined with carbonaceous materials. Indeed, purification was substantially improved when flotation was performed after magnetic separation.
Hydrothermal treatment. Synthesis of kaolinite was found to be facilitated by alkaline pretreatment for decomposition of quartz included in fly ash. There were little effect of temperature (up to 300゚C), pressure or pulp condition on growth of kaolinite. Ionic impurities of fly ash (Ca, Mg, K,Na) did not seem to hinder the reaction. Only pH was found to have some relationship with the productivity. The synthesized kaolinite had low crystalinity and large specific surface area. One of the present problem is low brightness of the product, caused by iron impurity.

  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 野澤美樹・鈴木政孝・松岡 功: "浮選による石炭灰からの未燃炭素分の除去に関する基礎的研究-高度利用を目的とした石炭灰の精製に関する研究(第1報)-" 資源と素材. 112巻2号. 99-105 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木政孝・野澤美樹・田路和幸・松岡功: "石炭灰の精製とカオリナイトの水熱合成" 資源・素材学会平成8年度研究・業績発表会口頭発表. (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nozawa, Miki (Faculy of Engineering, Tohoku Univ.) et.al: "Fundamental Study on Removal of Carbon from Fly ash by Flotation.-Purification of fly ash for advanced application (1st Report)" Shigen-to-Sozai. 112. 99-105 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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