Increase of BOF Converter Life by Own Slag Coating
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2012, Vol 35, Issue 3
Abstract
This paper presents a method for the improvement of the lining life of the BOF converter by slag coating, under nitrogen pressure. Own slag coating of converter lining is put in practice after steel tapping. Dolomite blocks are used like standard wear converter lining. Nitrogen blowing for own slag coating is carried out by oxygen lance. After steel tapping without slag, the converter is tilt in blowing position and the oxygen lance is let down in the lowest position. The nitrogen is blown under 10-12 barr pressure and 450-500 Nm3 /min rate, for 3 minutes. By this slag coating technology the performance of refractories has been improved from about 370 heats per campaign in reference year to about 800 heats per campaign at the end of two years of experiments, and therefore refractory consumption decreased from 5.25 kg/t under 3.00 kg/t and the cost of converter refractories decreased by 0.24 $/t. Another variant for improvement of the BOF converter lining life was the use of magnesia bricks for selective lining areas (trunion rings area and charging mouth). The own slag coating technology has been used also. In the case of this variant, the lining life of converter has been improved to about 800 heats per campaign at the end of two years of experiments and so the refractories consumption decreased under 2.45 kg/t. Because of the higher price of magnesia bricks and of the lower price of dolomite blocks, the cost for converter refractories has decreased only by 0.02$/t.
Authors and Affiliations
Viorel MUNTEANU, Dan ZORLESCU
Keywords
Related Articles
- EP ID EP618487
- DOI -
- Views 77
- Downloads 0
Research on the Behaviour of the Tooth - Crown Assemblies Made of Different Metal Materials in Solutions Simulating the Oral Environment
One of the basic principles of restorative dentistry is the conservation of the hard dental structure, while satisfying both aesthetic and functional requirements. Complying with this principle will minimize the harmful...
The Different Practical Application of Niobium Carbide Coatings Elaborated by CVD Process
In this paper, the different application of niobium carbide coatings onto hard carbide substrate was investigated using scanning electron microscope (SEM), Xray diffractometer (XRD) and micro-hardness. The paper conducte...
Quality Surface Analysis for Polarized Grid Plasma Nitridings
For the study regarding the effect of the polarized grid a prototype plasma nitriding facility was used. A polarized grid was placed inside the working chamber, into the space between the anode and cathode, a negative po...
Reducing the Sludge Quantity Produced from Used Water Purification – A Source of Profit
This paper has its origins in the analysis of a real situation met in the Water Purification Plant from Cluj-Napoca city. The produced dehydrated sludge is about 70 - 80 tonnes / 24 hours, with a density that allows for...
Electrical Properties Characterization of Vinyl Ester Resin Filled with Carbon Nanotubes
In this paper the authors have done a characterization of the electrical properties of vinyl ester based nanocomposites containing different percentages of carbon nanomaterials. The carbon fillers used in this study were...