MANUFACTURING OF C₂S USED BY PRODUCT CALCIUM HYDROXIDE AND ITS CO₂ EMISSION

副生の水酸化カルシウムを用いたC₂Sの製造とCO₂排出量原単位

If the calcium hydroxide by-product and the quartz rock with comparatively high purity are selected, 2CaO・SiO₂(C₂S) can be obtained because of burning the rotary kiln. The scorch point temperature was 1,450℃. Moreover, even if a special operation was not done during cooling, C₂S was able to be obtained. The amount of the CO₂ emission when C₂S was manufactured from the calcium hydroxide by-Product and the quartz rock became 124.5kg-CO₂/t, and usually reached a large value in the case of portland cement. If C₂S obtained from the calcium hydroxide by-product and the quartz rock is carbonation, CO₂ 450kg are reducible to 1 t-C₂S. If all of 210,000 t-calcium hydroxide by-product are employed for this use, CO₂ of 105,000 t are reducible.副生の水酸化カルシウムとケイ石を原料として、ロータリーキルンでの焼成試験を行った結果、遊離石灰や不溶解残分はわずかであり、純度の高いC₂Sを得ることができた。副生の水酸化カルシウムとケイ石からC₂Sを製造するときのCO₂排出量原単位は124.5kg-CO₂>/トンとなり、普通ポルトランドセメントを基準とした場合には83.9％のCO₂>削減となった。このC₂Sを炭酸化して用いると、C₂S 1トンに対して理論的に500kgのCO₂を吸収することができる。カルシウムカーバイド工業の副生の水酸化カルシウム21万トンをすべてこの用途で用いると、11.6万トンのCO₂を吸収することが可能である。

• Record URL:
  • https://doi.org/10.14250/cement.67.553
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=MANUFACTURING+OF+C%e2%1a%1aS+USED+BY+PRODUCT+CALCIUM+HYDROXIDE+AND+ITS+CO%e2%1a%1a+EMISSION&author=M.+SHOJI&author=T.+HIGUCHI&author=K.+YAMAMOTO&author=M.+MORIOKA&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • SHOJI, Makoto
  • HIGUCHI, Takayuki
  • YAMAMOTO, Kenji
  • MORIOKA, Minoru
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: pp 553-558
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 67
  • Issue Number: 1
  • Publisher: Japan Cement Association
  • ISSN: 0916-3182
  • EISSN: 2187-3313
  • Serial URL: https://www.jstage.jst.go.jp/browse/cement/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Calcium hydroxide; Cement kilns; Greenhouse gases; Manufacturing; Portland cement; Quartz; Raw materials; Waste products (Materials)
• Uncontrolled Terms: Belite
• Subject Areas: Environment; Highways; Materials; I15: Environment; I30: Materials;

Filing Info

• Accession Number: 01562651
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 30 2015 3:40PM