<報文>赤泥より銑鉄とセメント用鉱滓の製造について

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  • アカ デイ ヨリ センテツ ト セメントヨウ コウシ ノ セイゾウ ニ ツイテ
  • <Original Papers>Studies on the Production of Pig Iron and Cement Slag from Red Mud

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1) Factors in the pelletizing of red mud which was the residue of alumina production from bauxite were statistically analysed. Recovery of pellet with a diameter of 10~25 mm was 35% and its compressive strength was 1.5~2.2kg. 2) In the designated composition range of slag for producing cement (CaO/SiO_2 1.7~2.3,Al_2O_3 18~28%), chemical reactions occurring in the 150KVA furnace used for the experiment were statistically analysed. P and S in pig iron decreased with the increase of FeO and decrease of (ΣFeO) (Na_2S)/[(T・Na_2O)-(Na_2O)_S] in the slag respectively. Also, FeO in slag rapidly decreased with rise of temperature of molten slag. This was related with CaO and Na_2O in the slag. 3) Both low P and S in pig iron and slag for cement were produced from red mud by the electric furnace under the following conditions : unit consumption of gas-coke 250kg/t of Fe in red mud, CaO/SiO_2 1.8~2.0,total Na_2O in slag 5~6%, and voltage between poles 1.6V/cm, the ratio of area hearth to total sectional area of poles 7.9 was established. The composition of pig iron produced was C 4.05%, Si 0.02%, Mn 0.02%, P 0.018~0.024%, S 0.010~0.021%, Ti 0.002%. 4) The molten slag was atomized by water-jet and quenched in water. When u. r was more than 100cm/sec, the glass content in quenched slag was over 85% and was statisfactory as raw material of cement. u and r are velocity of water from nozzle (cm/sec) and the ratio of amount of water to slag respectively.

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