マルチフェーズ脱リンスラグからのリン濃縮相の磁気分離(<特集>マルチフェーズフラックスを利用した新精錬プロセス技術)

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The authors have found that phosphorus exhibits remarkable segregation in the exhausted actual hot metal pretreatment slag (dephosphorization slag) and it exists as 3CaO・P_2O_5-2CaO・SiO_2 solid solution together with FeO-CaO-SiO_2 matrix. Since their magnetic properties are significantly different, it is possible to separate them with the aid of superconducting strong magnetic field. In order to investigate effects of magnetic field strength, particle size of slag and so on, the experiment of the magnetic separation has been carried out by using simulated dephosphorization slag (18.1Fe_tO-45.9CaO-20.3SiO_2-6.6P_2O_5-2.5MnO-5.5MgO in mass%) and super conducting magnet with 0.5 to 2.5T. At stronger magnetic field, the quality of the recovered slag becomes better due to smaller contamination of Fe_tO matrix phase while its quantity becomes worse and the amount of recovered slag is smaller. However, the quantity of the recovered slag can be improved by repeating the magnetic separation procedure. In the present experiment, about 65% of phosphorus enriched slag can be recovered with less than 10% of Fe_tO matrix phase contamination at the condition of 0.5T, particle size of smaller than 35μm and water/slag ratio of 32 with single procedure. P_2O_5 content in the recovered slag is very close to that in the phosphorus enriched phase in the initial slag and Fe_tO content is markedly decreased with magnetic separation.
社団法人日本鉄鋼協会の論文
2009-03-01

マルチフェーズ脱リンスラグからのリン濃縮相の磁気分離(<特集>マルチフェーズフラックスを利用した新精錬プロセス技術)

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