【性能特點】          

    以優質合成原料配以多元復合添加劑及燒結劑生產而成，具有良好的抗鋼水和熔渣侵蝕及沖刷能力，燒結層致密，壽命長，噸鋼消耗低，易于施工和修補，節約能源。本產品適用于UHP爐爐底和爐坡工作襯。

由于爐底、爐坡受到高溫鋼水和爐渣的侵蝕與沖刷以及加入廢鋼時的機械沖刷，因此需選用耐侵蝕、耐沖刷、抗熱震性等高溫性能良好的耐火材料。本產品具有優良的燒結性能，易于形成堅硬致密層，具有良好的高溫結構強度，保證使用過程中安全可靠。同時適當提高基質中的氧化鎂含量，以提高抗氧化鐵侵蝕的能力。與高氧化鈣含量（18-20%）干式搗打料相比，燒結過渡層較薄，因而爐底熱損失低。

【施工方法】

1. 在砌好電爐爐底永久襯和爐墻后，清理干凈，嚴禁有雜物，然后加入干式搗打料，每次加料鋪平厚度為150mm左右，采用震動器振實或用搗固錘搗固，對新砌爐底，采用風錘搗固，這一方面可提高砌體密度，同時便于采用減少粉塵的措施，即在加完每層打結料后，鋪上麻布（或帆布），然后進行打結，搗打方式為每次先圓周向圓心順時針按同心圓方式搗打，要做到錘錘相加，再從圓心向圓周呈放射形搗打，如此重復三次左右，斜坡部位應支上模胎，同上法搗打至所需厚度，施工結束后，斜坡所用模胎最好不拆除。

2. 爐底打結完后，應用3mm左右廢鋼板覆蓋干式搗打料表面（若斜坡模胎不拆除，只須蓋裸露干式搗打料打結層表面），以防使用初期爐料刺傷爐底。

3. 在冶煉初期（特別是開始5-10爐），應先加石灰，再加散料，然后加重質料，并盡可能降低加料高度，適當提高冶煉溫度和延長冶煉時間，以保證爐底形成足夠的燒結層。

4. 注意爐況觀察，每爐出完鋼后，需用鐵耙探測爐底，同時要特別注意爐坡侵蝕情況，做好維護修補。

5. 爐底或爐坡出現凹坑或局部蝕損時，應采取投補措施，補爐料用原爐底搗打料。

【Performance Characteristics】

The product is produced with high quality composite raw material and multi-element composite additive and agglutinant. It has characteristics of excellent capacity of liquid iron and slag corrosion and flushing resistance, compact sintered layer, long service life, low ton iron consumption, easy construction and repair, energy conservation. The product is applicable to UHP furnace hearth and furnace slope work liner.

Since the furnace hearth and furnace slope encounter the corrosion and flushing of high temperature liquid iron and slag and the mechanical flushing when adding scrap steel, refractory with excellent high temperature performances such as corrosion resistance, flushing resistance and thermal shock resistance etc. should be selected. The product has excellent sintering character to form hard compact layer and excellent high temperature structure strength to guarantee security and reliability during the process of using. Meanwhile, the content of magnesia oxide in base material is enhanced properly to improve the capacity of resisting the corrosion of ferric oxide. Compared with dry type ramming material with high calcium oxide content (18-20%), the sintering transition layer is thinner, so the heat loss of furnace hearth is lower.【Construction Method】

1. When the hearth permanent liner and furnace wall of the electric furnace are built, clean it, and foreign matter is forbidden. Then add dry type ramming material. The paving thickness of material each time is about 150mm. Apply vibrator to vibrate or apply compactor to tamp and apply air hammer tamping to newly built furnace hearth. In this way, not only the density of masonry is enhanced, but also the taking of fine dust reduction measures is facilitated. That is, when the ramming material of each layer is added, lay flax (or canvas), then carry out ramming. The method of ramming is to ram from circumference to center in clockwise according to concentric circle method each time, and each ramming is increased, and then to ram from center to circumference. Repeatedly Repeat the process is for about three times. Mould shall be set up at slope position and rammed to required thickness according to the above method. After the construction, it would be better not to remove the mould used for slope.

2. When the furnace hearth is rammed, cover the surface of the dry type ramming material with scrap steel plate with a thickness of about 3mm (if the mould for slope is not removed, only the exposed surface of dry type ramming layer is covered), so as to prevent the furnace hearth from being damaged when applying initial furnace burden.

3. In the beginning of smelting (especially the first 5-10 furnaces), lime shall be added first and then balk material is added, then heavy material is added. Reduce the height of material adding as much as possible, properly enhance the smelting temperature and extend smelting period, so as to make sure that enough sintering layer is formed at furnace hearth.

4. Pay attention to observing the situation of furnace. When the iron runs from each furnace, use a rake to probe furnace hearth. At the same time, pay special attention to the corrosion situation of furnace slope and carry out maintenance.

5. In case of pitting or local deterioration in furnace hearth or furnace slope, repair measures shall be taken. The original furnace hearth ramming material is applied as repairing mass.