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BENCH SCALE STUDY OF THE CHROMIUM AND NICKEL RECOVERY FROM DUSTS AND SLUDGES GENERATED IN STAINLESS STEELMAKING

机译:不锈钢制造中灰尘和污泥铬恢复的长凳规模研究

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Currently Brazilian stainless steel production is around 350,000 tons per year. The stainless steel industrial generates several tons per year of dusts and sludges with high content of chromium, nickel, and iron. These wastes represent a problem to the stainless steel plants due to their high amount of chromium, iron, and led that could be recovery in the ironmaking process. Beside wastes can cause a contamination to the environment where they are put. The solution to these problems can be in the recycling of the dusts and sludges generated during stainless steel process. The characterization of these wastes was the first step of this study. Four wastes (one dust and three sludges) were used in this work. Then the wastes were agglomerated in the briquette form to introduction in liquid steel in the melting experiments performed in the apparatus at three temperatures 1570, 1600 and 1635°C. A bench-scale piece of equipment was used to melt the steel and briquettes. Samples were withdrawn periodically of the bath to verify the chromium behavior with the time of the experiment. A high recovery of chromium was found and the time required to this was about 15 minutes at 1600°C.
机译:目前巴西不锈钢生产每年约35万吨。不锈钢工业的灰尘产生几吨,铬含量高,镍和铁的污染。由于它们的高量铬,铁和LED,这些废物代表了不锈钢厂的问题,可以在炼铁过程中恢复。除废物旁边可能会对他们的环境造成污染。这些问题的解决方案可以是在不锈钢过程中产生的灰尘和污泥的回收。这些废物的表征是本研究的第一步。在这项工作中使用了四次废物(一个灰尘和三个污泥)。然后将废物凝聚在煤层形式中,以在熔融实验中引入液钢中,在装置中在1570,1600和1635℃下在装置中进行。一款长凳尺度的设备用于熔化钢铁和煤球。将样品定期撤回浴以验证铬行为与实验的时间。发现了高回收铬,并且在1600℃下需要约15分钟的时间。

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