1、中文 972 字 碱性钢包渣对 MgO-C 耐火的酸腐蚀造成了物质中碳含量的影响 THE INFLUENCE OF CARBON CONTENT ON THECORROSION OF MGO-C REFRACTORY MATERIALCAUSED BY ACID AND ALKALINE LADLE SLAG This paper describes an investigation of the influence of increasing carbon content on the corrosion of MgO-C refractory material by molten slag
2、. The refractory material contained mass fraction of 98 % MgO, approximately 2 % Fe2O3, and graded quantities from 3 % to 18 % C. The corrosion was investigated in melts of reduction ladle slags at a temperature of 1600 C in laboratory conditions. A sample of refractory material with dimensions of 1
3、0 10 100 mm was submerged into the molten slag and exposed to the corrosive effect of the slag for 60 min. After the expose of the refractory material the slag was cooled down and submitted to a chemical analysis. After a comparison of the MgO content in the slag before and after the corrosion test
4、the amount of MgO content in the melt was determined and the degree of corrosion of the refractory material was quantified. The experiments were realised using final slags from the ladle furnace (LF), strongly alkaline slag w(CaO)/w(SiO2) = 4.43, and also acidic slags w(CaO)/w(SiO2) = 0.94 with diff
5、erent contents of CaF2. The work was carried out within the frame of the projects EUREKA E!3580 and IMPULS FI-IM4/110. RESULTS The chemical composition of the slags before the exposure is given in the Table 1. Table 1 shows that the acidic slag contains very little of the CaF2 (w = 0.82 %), and that
6、 the alkaline slag contains 7.18 % CaF2, added to increase its fluidity. Table 1: Chemical composition and alkalinity of the slags used for the corrosion test Tabela 1: Kemina sestava in bazinost linder, ki sta bili uporabljeni za preizkuse korozije The MgO content of the slags after exposure to the
7、 refractory material is shown in Tables 2 and 3. The tables also contain increments of the MgO content and the increments related to the initial MgO content in the slags (MgO). The six tested samples of refractory material differed only in terms of the carbon content, graded from 3 % to 18 %. Howeve
8、r, sample 5 % contained 15 % C in addition to an antioxidant. Table 2: Changes to the MgO content in an acidic slag for different carbon contents in the refractory material Tabela 2: Spremembe vsebnosti MgO v kisli lindri pri razlini vsebnosti ogljika v ognjevzdrnem materialu Table 3: Changes to the
9、 MgO contents in an alkaline slag for different carbon contents in the refractory material Tabela 3: Spremembe vsebnosti MgO v bazini lindri pri razlini vsebnosti ogljika v ognjevzdrnem materialu Figures 1 and 2 show the change of the MgO content in slags with respect to the carbon content in the re
10、fractory material. Figure 1: Change in the content of MgO in acidic slag with respect to the carbon content in the refractory material Slika 1: Spremembe vsebnosti MgO v kisli lindri v odvisnosti od vsebnosti ogljika v ognjevzdrnem materialu Figure 2: Change in the content of MgO in the alkaline sla
11、g with respect to the carbon content in the refractory material Slika 2: Spremembe vsebnosti MgP v bazini lindri v odvisnosti od vsebnosti ogljika v ognjevzdrnem materialu In order to enable a comparison of the quantitative effect of carbon content in the MgO-C refractory material on its corrosion intensity by acidic and alkaline slag, the changes in the MgO and
