Blast furnace blow-in burdening method

Abstract

The invention discloses a blast furnace blow-in burdening method. The furnace burden of a blast furnace is divided into four segments, namely a wood segment, a net coke segment, a blank coke segment and a normal material segment; hard wood is loaded into the wood segment; all-clinker blowing-in with the hard wood rather than a wooden sleeper is adopted, such that the generation amount of furnace slag may be greatly reduced and the gas permeability of a cohesive zone may be improved; especially in 6-10 hours at the preliminary blowing-in stage, the formation time of the cohesive zone is shortened, the blowing-in process is accelerated and the production condition of the blast furnace is stabilized. Coke is loaded into the net coke segment; blank coke is loaded into the blank coke segment and satisfies the following blank coke matching conditions: furnace slag binary basicity R2=1.05, CaF2 in slag ranging from 2% to 6% and [Si] in liquid iron=2.5%. Normal materials are loaded into the normal material segment and the matching of the normal materials is enabled to satisfy the following conditions: furnace slag binary basicity R2=1.1, CaF2 in slag ranging from 2% to 6%, [Si] in liquid iron=4%, a slag ratio being less than 400kg / thm, and a liquid material load level maintained within 2.5.

Description

technical field [0001] The present application relates to the technical field of blast furnace ironmaking in metallurgical engineering, and in particular to a blast furnace batching method. Background technique [0002] The proportion and distribution method of blast furnace start-up charge is the core technology of blast furnace start-up, and also the key to determine the smooth start-up of blast furnace. Traditional blast furnace ingredients mostly use sinter, pellets, and lump ore as the main material, with auxiliary materials such as fluorite and silica, and the overall requirement is to control Al in slag. 2 o 3 content, and dilute the slag by increasing the slag ratio to ensure good fluidity of the slag. In addition, manganese ore is added to achieve the effect of diluting slag iron. For example, in the batching method for large and medium repairs of blast furnaces, the total coke ratio of the furnace charge is required to be 3000kg / ton iron-3400kg / ton iron; the sla...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a batching method for rapid start-up of blast furnace to reach production capacity, so as to solve the technical problem of unsmooth start-up caused by unreasonable charge structure

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