Characterization of "K Powder" Generated in Cement Kiln Part1. Analysis of Major Minerals and Powder Characteristic in "K Powder"

• Published in: Journal of MMIJ Vol. 127; no. 2; pp. 88 - 93
• Main Authors: ICHITSUBO, Kouki, YAMASHITA, Hiroki, SUZUKI, Tsutomu, MIURA, Keiichi, OWADA, Shuji
• Format: Journal Article
• Language: English
• Published: The Mining and Materials Processing Institute of Japan 25.01.2011
• Subjects: Characterization; Chlorine Bypass System; Classification; Constituent Mineral; K Powder; Particle Size Distribution
• ISSN: 1881-6118; 1884-0450
• DOI: 10.2473/journalofmmij.127.88

Recently, many kinds of aversive substances (chlorides, alkalies, sulfurs and heavy metals) are brought into cement manufacturing process as raw materials, and they are usually removed by chlorine bypass system from cement kiln-preheater, which is called as "K powder" . Since "K powder" contains not only aversive substances but also cement constituents, its character has been expected to be clarified. In this study, we carried out the analyses on mineralogical and powder properties of "K powder" . As a result, we confirmed that "K powder" was composed mainly of CaO, KCl, CaSO4 and Pb10(SiO4)3(SO4)3Cl2, and its median size was approx. 12 μm, and that "K powder" had a tendency that volatile and heavy metal constituents were concentrated in the size range under 10 μm, and cement constituents were concentrated in 10-44 μm size range. However, volatile and heavy metal constituents were cohesive and adhered to cement constituents, then, it is thought to be difficult to separate specific minerals from each other in the "K powder" by particle size in dry process.