The Control Study Of As And Cu Trace Elements In Molten Metal

With the development of "clean steel" production technology, the purity of steeldemand higher and higher, the requirement of impurity elements in steel become more andmore stringent. Residual elements in steel have an important impact on the quality of steel.Reducing the content of impurity elements in steel is the production of clean steel,improving steel quality and performance of the important and difficult. In the currentsituation that high-quality iron ore prices are rising abroad, energetically develop domesticiron ore resources have become the best choice of the domestic steel enterprises. However,there are high level of arsenic content in some domestic iron ore resources. High content ofarsenic in steel can cause a series of defects such as steel surface cracking, increase steelhot-working brittleness, reduce steel impact value and the plastic and so on. It affects steelperformance, causes decrease of steel products quality decreased. So it is necessary toremove arsenic impurity elements in the process of smelting the produce of high qualityclean steel need to be added low impurity content alloy. Copper, as the main traceelements in steel, not only have a “copper brittle” phenomenon, but also causes seriousharm for the performance of the steel. Therefore, it is necessary to study the method ofreasonable decoppering in ferroalloys.By adding arsenic removal catalyst, preparation of different slag are used to study itseffect on arsenic removal in molten steel. The paper gets the effects of favorableconditions of steel dearsenifying through the experimental study of C, O, S elements insteel for dearsenifying. After a series of experimental research, the follow factorsconducive to remove of arsenic in steel: adopt Al₂O₃-CaO alkaline slag have good effecton removing arsenic. Using Ca-Fe alloy and additive in the experiment, the desulfurizationrate is62.5%, the arsenic removal rate is77.5%, and arsenic removal effect is verysignificant. The arsenic removal rate increased with the accession of Ca-Fe alloys andadditive increasing in steel. The lower the C, O, S content in steel, the more obviouseffects of arsenic removal. During the industrial trials, on vacuum condition arsenicremoval can not be achieved. The paper research as copper removal by FeS agent on the nickel-iron alloy. Theeffect of FeS addition, carbon content in the alloy, temperature, initial copper content inthe alloy, slag addition, and property of slag and metallic nickel on copper removal ratioare discusses through comparative tests. Experimental results show that: copper removalrate increases with FeS agent addtion increasing; alloy with high carbon content of in favorof removal of copper, within a certain range, the experiment temperature rising isconducive to removal of copper, alloy with high copper content in the original helpscopper removal. Adding acidic and oxidizing slag can promote copper removal reactionand reduction of nickel loss, but the increasing of adding is not conducive to copperremoval. Under the present low-copper-nickel alloy experimental conditions, the coppercontent in alloy decreased to2.13%is obtained the best results of copper removal.