MANUFACTURING METHOD OF NON-CALCINED COAL-CONTAINING MASS ORE FOR BLAST FURNACE AND MANUFACTURING APPARATUS

• Main Authors: TSUTSUMI TAKESHI, FUJISAKA TAKEYUKI, OKAJIMA RYOTA, OKADA TSUTOMU, ISHIMARU SHINGO, SAKAGAMI HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 17.12.2020
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide technique capable of stably and in a large amount manufacturing non-calcined coal-containing mass ore for blast furnaces having high strength, even when T.C. is 15 mass% or larger and a blending ratio of a hydraulic binder is slight.SOLUTION: Into a coal-containing mass ore raw material in which, 87.0 to 97.5% in total of an iron-containing raw material, a carbon-containing raw material, and other raw material are blended by adjusting a blending ratio, such that, by mass ratio, a hydraulic binder is 2.0 to 9.0%, a fine particle silica source is 0.5 to 4.0% and a ratio (T.C) of carbon contained in the coal-containing mass ore is 15 to 40%, 9.0 to 14.0% of water is added and transferred, while continuously mixing, a connection part for transferring to a second extrusion part by vacuum deaerating the first extrusion part and the mixed raw material continuously supplied therefrom, the mixed raw material supplied from the connection part and vacuum deaerated is extruded in a molding part provided with a many holes to continuously extrude to produce a molded body, the continuous molding is performed in the range of the packing density of 50 to 95 vol% due to the mixed raw material of the second extrusion part.SELECTED DRAWING: Figure 1 【課題】T．C．が15質量％以上で、水硬性バインダーの配合率が少なくても、高強度な高炉用非焼成含炭塊成鉱を安定かつ大量に生産できる技術を提供する。【解決手段】質量比率で、水硬性バインダーを2.0〜9.0％、微粒シリカ源を0.5〜4.0％、含炭塊成鉱原料中に含まれる炭素の割合(T．C．)を15〜40％となるように、鉄含有原料、炭素含有原料、その他原料の配合率を調整して合わせて87.0〜97.5％を配合した含炭塊成鉱原料に、9.0〜14.0％の水を加えて連続的に混合しながら移送し、第一の押出部と、そこから連続的に供給される混合原料を真空脱気し、第二の押出部へ移送する接続部と、接続部から供給される真空脱気された混合原料を多数の孔を備えた成型部へ押し込むことで、連続的に押し出して成型体を製造し、第二の押出部の混合原料による充填率が50〜95体積％の範囲で連続成型する。【選択図】図１