Li_2CO_3 添加 CaO-CaF_2-FeO 系フラックスによるクロム含有溶銑の脱りん(脱りん・脱硫 : 石灰系スラグ)(<特集>溶銑処理の発展)

概要

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An investigation has been made in order to search for effective fluxes for dephosphorization of molten chromium-containing pig iron on a laboratory scale. By treating molten pig iron containing 18%Cr and 8%Ni using 70 g(per kg of metal) of, for example, 10%Li_2CO_3-14%CaO-47%CaF_2-29%FeO flux, P, S and N in metal were removed by about 70%, 90% and 85%, respectively. High degree of dephosphorization was obtained with low silicon content and high carbon content near the carbon saturation in metal, and in the slag composition containing more than 1% of lithium, with (%CaO) (%SiO_2)≧3 and (%CaF_2)≧30. Even relatively low contents of SiO_2, Al_2O_3 and MgO in slags had unfavorable effects on the dephosphorization. The temperature range suitable for the dephosphorization treatment was about 140℃. By X-ray diffraction analysis of the solidified sample Ca_5F(PO_4)_3 (fluorapatite) was identified as a compound containing phosphorus and LiCrO_2 as a compound containing chromium in the phosphorus-enriched Li_2CO_3-CaO-CaF_2-FeO-Cr_2O_3 slag. On the other hand, Ca(CrO_2)_2 was identified as a compound containing chromium in the slags without the addition of Li_2CO_3 or with the addition of Na_2CO_3 or K_2CO_3 instead of Li_2CO_3.
社団法人日本鉄鋼協会の論文
1983-11-01