<報文>赤泥より銑鉄とセメント用鉱滓の製造について

IR IR (HANDLE) Web Site

Bibliographic Information

Other Title
  • 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

Search this article

Description

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.

Journal

Details 詳細情報について

Report a problem

Back to top