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.

Key technological features of cold mill for tinplate;

Technics pressing tinplate to produce packing box;

Determination of Lead in Tinplate by ICP AES;