Separation of Lead Component from “K powder” Generated in Cement Kiln by Sulfidized Flotation

DOI Web Site 16 References
  • ICHITSUBO Kouki
    Graduate School of Creative Science and Engineering, Waseda University
  • IDA Masaya
    Taiheiyo Cement Corporation, Research & Development Center
  • SUZUKI Takayuki
    Taiheiyo Cement Corporation, Research & Development Center
  • OGIRI Tetsuo
    Taiheiyo Cement Corporation, Facility And Technology Development Project Team
  • MIURA Keiichi
    Taiheiyo Cement Corporation, Research & Development Center
  • SHIBAYAMA Atsushi
    Faculty of Engineering and Resource Science, Akita University
  • NOMURA Eiji
    Graduate School of Creative Science and Engineering, Waseda University
  • OWADA Shuji
    Faculty of Science and Engineering, Waseda University

Bibliographic Information

Other Title
  • 硫化浮選によるセメントキルンから発生するＫパウダー中のPb成分の分離
  • リュウカフセン ニ ヨル セメントキルン カラ ハッセイ スル Kパウダー チュウ ノ Pb セイブン ノ ブンリ(ダイ2ホウ)ヤクザイ テンカ ホウホウ ノ ヘンコウ ニ ヨル フセン ショリ ノ コウコウリツカ ノ ケントウ
  • Part2. Improvement of Separation Efficiency by Developing New Process of Agents Addition
  • 第2報　薬剤添加方法の変更による浮選処理の高効率化の検討

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Abstract

Recently, huge amount of waste has been recycled in cement plant, and many kinds of aversive substances (chlorides, alkalies, sulfates and heavy metal salts) have been brought into cement manufacturing process with the wastes as raw materials. These substances are usually removed by chlorine bypass system from cement kiln-preheater, called as “K powder”. Since cement plant is expected to use more wastes, “K powder” constituents should be separated with each other as recycled resources.<BR>In this study, we tried sulfidized flotation to separate lead components from “K powder” with the recovery of more than 80% by changing the addition order of sulfuric acid and NaHS in flotation conditioning, and also clarify the reaction mechanisms. As a result, we found the optimum conditions of the new process in case of 150 g-“K powder”/L pulp density as follows. 1) Adding NaHS (molar ratio of NaHS/Pb in “K powder”=1.0) into the pulp, and mixing 15 min for sulfidization, 2) Adjusting the pulp pH under 4.0 by sulfuric acid, 3) Mixing the pulp 30-90 min for aging of gypsum formation at pulp pH under 4.0, 4) Adding the total PAX of 1.5 g/kg-“K powder” in 2 or 3 stages, and carrying out 40 min flotation. We also found that the K2Pb(SO4)2 formation which causes the decrease of lead recovery can be suppressed by adding NaHS prior to sulfuric acid addition. Additionally we noted that the new process can decrease the addition of NaHS and PAX to four fifth and half respectively, and can extend the acceptable range of pulp density, gypsum formation pH, gypsum aging time, and flotation pH for good separation compared with the conventional process, then, the process control could become simplified. As the result, we could separate lead components in “K powder” with the recovery over 80 % as a lead concentrate over 40 wt% Pb by this new sulfidized flotation process.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127 (12), 699-707, 2011

    The Mining and Materials Processing Institute of Japan

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