外文翻譯---更有效益地使用不銹鋼電弧爐煉鋼渣作為水泥原料及其重金屬摻入量的風(fēng)險(xiǎn)分析-文庫(kù)吧
2025-04-17 09:28 本頁(yè)面
【正文】 ds for using stainless steel slag as a safe resource. 2 Material and methods The stain less steel EAF slag w as sampled from the Baosteel Stainless Steel Business Unit It was the tailings of molten stainless slag from an EAF after water immersion, cooling, crashing, grinding, and gravity and magic separation. The chemical and mineral positions of the stainless steel EAF slag were determined using an Xray fluorescence spectrometer ( referred to as XRF, Model SRS 3400, produced by BRUKER AXS GMBH, Germany) and an Xray diffractometer ( referred to as XRD , Model D /max 2550X, produced by Rigaku Co.,Japan) . The contents of Cd , Cr, Cu, Ni Ba , Pb , and Zn in the slag sample were analyzed by ICPOES ( Optima 2100DV, produced by Perk in Elmer Inc., USA ) , while the contents of As and Hg were analyzed by AFS ( XGY1012, produced by the Institute of Geophysical and Geochemical Exploration, the Chinese Academy of Geological Sciences, China ), after aquaregia digestion. The concentration of Cr (VI) in the leachate was determined by Dipehenylcarbohydrazide Spectrophotometry . The leaching toxicity of the slag samples was determined according to the Test method standard for leaching toxicity of solid wastes. the horizontal vibration extraction procedure(GB 5086. 21997) and the Toxicity Characteristics Leaching Procedure ( referred to as TCLP, USA ). The speciation of heavy metals in the slag samples was analyzed by the sequential extraction procedure according to the Tessier A and Wan X method. Internal and external exposure indexes were determined accord ing to the state standard, the Limit of radionuclides in building materials ( GB 6566 2020). The cementitious activity test of the EAF slag was determined according to the Test method for the activity of industrial waste slag used as cement mixing materials (GB 12957). The pressive and bending strength of the cement were determined according to the Test method for cement mortar strength (ISO) (GB/T 176711999). The consistency, setting time and soundness of the cement were determined according to the Test methods for the water consumption, setting time and the stability of the normal consistency of Portland cements (GB/T 13462020). 3 Results and discussion 3. 1 The physical and chemical properties of the stainless steel EAF slag Table 1 shows the chemical position of the stainless steel EAF slag. The slag is mainly made up of CaO, SiO2, Al2O3, MgO, and contains less Fe, more SiO2, a higher concentration of Cr2O3 and some NiO when pared with conventional carbon steel slag. The mineralogical result () indicates that stainless EAF slag contains silicates, i. e., Ca2SiO4, Ca3Mg(SiO4)2, and Cr containing minerals. The chemical and mineral properties o f EAF slag are similar to those of cement suggesting that stainless steel slag can be used as a raw material of cement The heavy metal content in stainless steel EAF slag and the leaching toxicity of the slag The heavy metal content in stainless steel EAF slag are shown in Table and Ni were the major ponents of the slag heavy metal co
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