Because of the local collapse of the 300t mixer receiving iron mouth and a lot of consumption about receiving iron jackets,after analyzing three restoration schemes,the field hot pouring schem is adopted combining the practice production.

Reasons for the Difficulties in Clay Gunning in No.1BF Taphole and Its Measures;

In order to assure the BF's safety production, protect the taphole and the part around it, lighten erosion of taphole brickliner, the taphole clay containing Titanium is used to maintain taphole.

In order to increase the hot metal throughput of main trough, some reforms to the trough were carried out, and in order to realize zero-interval tapping and meet the needs for smooth operation and intensified smelting of BF, the management and maintenance of taphole were strengthened at Maanshan Steel's 2500 m~3 BF.

Based on the production experience and the analysis on the aspects of iron notch depth,notch opening situation and slag tapping from the iron notch,the reasonable composition of gun mud is found out to improve its quality,and as a result,the iron tapping from the notch gets obvious improved.

Through adopting the technical measures such as local tuyere blowing above iron notch, burning iron notch with rich oxygen lance, tapping from iron notch, discharging slag and hot metal timely, adding coke in concentrative and de-concentrative forms and drilling the tuyere timely and so on, the accident of hearth chill was treated effectively.

In addition,the main reason for iron notch disorder of No.

tapping hole is an integrated one in many aspects.

Prediction problem of torpedo ladle car (TPC) actual reception iron amount under the blast furnace is discussed,which has an important function to coordinate molten iron balance,decrease exchanging bottles,reduce temperature loss and raise TPC utilization.