Effects On Characters Of Slag Of Blast Furnace By Unburned Pulverized Coal

It is avoidless to bring unburned pulverized coal in the case of injecting pulverized coal into blast furnace of iron making. A part of unburned pulverized coal rises companying blast furnace gas. Except that some of unburned pulverized coal which rises sediments in raw material column, is blown off out of blast furnace, reduces directly with FeO and gasifies with coke, leftover unburned pulverized coal which reaches the upside of blast furnace is sucked by original slag formed at dropping zone, which changes the capacities of original slag of blast furnace. The capacities of original slag have important effects on perviousness and gas permeability of blast furnace underneath. Moreover, unburned pulverized coal can rise viscosity and free running temperature of original slag, if unburned pulverized coal is excessive ,it is difficult to drop, which deteriorates perviousness and gas permeability of blast furnace. As a result, blast furnace can't produce normally. At the same time, else unburned pulverized coal penetrates blast furnace ultimate slag and changes the capacities of ultimate slag (particularly viscosity). Experiments were carried out in the lab to simulate dropping zone of blast furnace in a high temperature oven, to get original by smelting raw material of Wuhan steel-iron company 4# BF. Ultimate slag of 4# BF was used as experimental ultimate slag. Unburned pulverized coal was acquired with injection pulverized coal of 4# BF. Then the amount of unburned pulverized coal of three ways injection coal: 150kg/t, 180kg/t, 200kg/t, was ascertained. The quantum of unburned pulverized coal in original slag and ultimate slag was calculated also, so that researched the characters of original slag and ultimate slag which contain different amount unburned pulverized coal. In this research, writer mensurated viscosity and free running temperament of original slag and ultimate slag which contain different unburned pulverized coal, then assayed and compared the results of experiments by knowledge of phase diagram, mineragraphy and ion theory of slag to offer academic basis and authorities of experiments for further injection coal of blast furnace.