Patent ID: 9617609
Date: 2017-04-11
CPC Classifications: C21B

Claim:
1. A method for preparing blast furnace blow-in coal blown from a tuyere into an interior of a blast furnace main body of a blast furnace installation, the method comprising: a first step of analyzing a moisture content of run-of-mine coal, ash of the coal, and weight percentages of Al, Si, Ca and Mg in the ash; a second step of selecting, on the basis of data obtained by analysis, a first coal type, of which the moisture content in the run-of-mine coal is less than 15% by weight, and a total weight of Al, Si, Ca and Mg oxides in the ash is not less than 70% by weight of the ash weight, and, when the total of Al, Si, Ca and Mg oxides in the ash is taken as 100% by weight, an Al a third step of selecting, on the basis of data obtained by analysis, a second coal type, of which the moisture content in the run-of-mine coal is not less than 15% by weight, and the total weight of Al, Si, Ca and Mg oxides in the ash is not less than 70% by weight of the ash weight, and, when the total of Al, Si, Ca and Mg oxides in the ash is taken as 100% by weight, the Al a fourth step of deriving an ash melting point of a mixed coal upon mixing the selected first coal type and the second coal type, on the basis of a four-dimensional state diagram for SiO a fifth step of selecting SiO a sixth step of deriving an addition quantity of the selected additive to the mixed coal; a seventh step of mixing the selected first coal type and the second coal type to result in mixed coal; and an eighth step of adding the additive in the addition quantity to the mixed coal.