不銹鋼廠廢耐火磚再利用於造渣助熔劑之實例探討

Case study of recycling of scrap firebrick as flux in stainless steel plant

邱世宗(Shih-Tsung Chiu)

指導教授 ： 張國慶

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2010年)

https://doi.org/10.6346/NPUST.2010.00129

摘要

本研究針對不銹鋼廠煉鋼設備盛鋼桶、電弧爐及轉爐內襯耐火磚汰換產出之廢棄物，進行回收再利用，以研究廢耐火磚當造渣助熔劑之可行性。
在實驗分析方面，就分析結果得知，白雲石磚氧化鎂(MgO)含量在31.50-44.89 %，氧化鈣(CaO)35.17-46.09 %，高鋁磚三氧化二鋁在83.91 %，鎂碳磚氧化鎂達83.11 %，以不銹鋼電弧爐製程而言，廢耐火磚再利用能部分取代或代替原已使用於煉鋼製程中的生石灰、輕燒氧化鎂、鋁錠等當造渣助熔劑使用，產出的廢耐火磚可完全去化，以達「零廢棄」，且不會影響鋼液品質。
在經濟效益方面，廢耐火磚取代或代替原料使用，可降低原料操作成本，以產品30400及43000為例，每爐可降低原料操作成本19,184（元）及12,656（元）。
另在溫室氣體排放減量方面，可減少原料製程中二氧化碳產生，以產品30400為例，每爐可減少生石灰用量1,757.2 kg/爐，降低CO2排放量1.31公噸，43000產品每爐可減少生石灰用量2,145 kg/爐，並降低CO2排放量1.6公噸。綜合上述內容發現廢耐火磚當造渣助熔劑可行並成效良好。

關鍵字

電弧爐 ； 轉爐 ； 盛鋼桶 ； 造渣助熔劑 ； 耐火磚

並列摘要

The research is for the feasibility of using scrap firebricks as slagging flux by recycling the scrap from the replacement of the firebricks inside steel-making facilities such as ladles, electric arc furnaces, and converters.
In the aspect of experiments and analyses, we could know that in a dolomite brick, 31.50 - 44.89 % would be magnesium oxide (MgO) and 35.17 - 46.09 % would be calcium oxide; in a high alumina brick, 83.91 % would be Al2O3, and 83.11 % of a magnesia carbon brick would be magnesium oxide according to the results of analyses. Take electric arc furnace process as an example, recycling scrap firebricks could partially or fully replace limes, caustic calcined magnesites, aluminum ingots, and other materials used in steel-making processes originally. Scrap firebricks could be totally consumed for meeting the need of “waste-free”; moreover, the quality of the molten steel will not be affected by scrap firebricks. In the aspect of economic benefits, replacing raw materials by firebricks could reduce running costs of raw materials. Take product 30400 and product 43000 for instance, each furnace of molten steel of the two products could diminish 19,184 dollars and 12,656 dollars on running cost respectively.
Moreover, in the aspect of greenhouse gases emission reduction, using scrap firebricks could decrease the generation of CO2 in steel-making processes. Take product 30400 for example, every furnace of molten steel could reduce the use of limes 1,757.2 kg, and lower CO2 emission 1.31 tons. Each furnace of molten steel of product 43000 could decrease the use of burnt limes about 2,145 kg, and lower CO2 emission 1.6 tons. To synthesize the content above, it could be found that using scrap firebricks as slagging flux would be feasible and effective.

並列關鍵字

Electric arc fumace ； Metal refining process converter ； Ladle ； Flux ； Refactor Brick

參考文獻

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