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Cast stone production is a product with a suitable particle size (0.01-0.1 mm) by converting the raw material into a single "cast pyroxene" mineral phase by melting the raw material, crystallization of the slurry, and annealing the casting. In the multi-mineral phase such as plagioclase, ordinary pyroxene, olivine, magnetite, etc., it can be obtained by transforming into a single xocene stone, which is a special pyroxene phase that can be obtained under the conditions of casting stone. granularity. Under certain process conditions, when a suitable particle size is obtained, the transformation of the mineral phase is correspondingly completed.
The chemical composition of the cast stone raw materials is mainly SiO 2 , CaO, MgO, FeO, Fe203, Na 2 O and K 2 O. Among them, SiO2, Al203, Ca0 and FeO play a decisive role in the mineral phase composition. . FeO and Fe2O3 are slightly less, but they play an important role in adjusting the viscosity of the melt, and they are the only constituents of magnetite. The content of K2O and Na2O is small, which can reduce the viscosity of the melt, and often lags behind to become a component of the precipitate. The crystallization of cast stone products can theoretically be discussed from the Ca0-Mg0-Alz03-SiO2 quaternary system. Now, K2O and Na2O are neglected. When FeO and Mg0 are combined and Fe203 and A1203 are combined, the chemical composition can be converted.
For example, the total amount of iron oxide is distributed according to FeO:Fe2O3=1:2, and the obtained percentage is plotted on the CaO-MgO-Ai203-SiO2 quaternary phase diagram. On the 25%Fig. 2647 diagram of the ceramic phase diagram 2647, it can be seen that this composition point is near the triple point of anorthite An, Dongqingshi Cord, and spinel Sp. It is impossible to see cordierite in basalt. The FeO:Fe2O3 is not equal to 1:2. If the total amount of iron oxide is distributed according to FeO:Fezq=2:1, the resulting percent (8) is plotted on the 20th. A120, on the cross section, it can be seen that this composition is near the triple point of anorthite An, pyroxene Pyrox, and olivine For. The triple point temperature is less than 1300 'C, that is, the initial melting temperature of the above component points is not more than 1300 °C.
FeO and Fe203 were added to the cast stone, and the SiO2-Mg2SiO4-Fe3O4-CaAl2Si2O8 diagram of the CaO-MgO-FeO-Fe2O3-A1203-SIO2 hexavalent system was discussed. The ceramic phase diagram 2255-2257. On the surface of the Mg2SiO4-CaA12Si208-SiO2 of the regular tetrahedral pattern, the line belonging to this surface is indicated by a thick black line, and there are two triple points, one is the melting point of 1260 ° C, and the other is 1220 ° C. Melting point. Here, the melting point, the first olivine precipitated with the melt, will be transformed into pyroxene and anorthite. If the melt does not end the crystallization at this melting point temperature, the melt will continue to cool to 1220 ° C to end the crystallization. Now the Fe3O4 end is replaced by CaMgSi206. Then, a triple point was observed on the surface of Mg2SiO4-CaMgSi206-CaA12Si208 of the SiO2-Mg2Si04-CaMgSi2O6-CaA12Si2O8 quaternary diagram (ceramic phase diagram 894) at a temperature of 1270 °C. In view of this, the CaMgSi206 phase has its corresponding point in the tetrahedron of SiO2-Mg2SiO4-Fe304-CaA12Si208, that is, there is a boundary line between anorthite and pyroxene and olivine in the tetrahedron, and the temperature thereof is 1260°C-1270°C. In addition, there is a eutectic point of 1200 ° C on the surface of SiO 2 -CaMgSi 2 O 6 -CaA12Si208. It can be seen that after adding FeO and Fe2O3, the initial melting temperature of the material, that is, the final crystallization temperature will be lowered to 1200-1220 ° C. The known raw material has Na20+K20 of 4.15%, and Na20 is albite NaAlSi308. Composition. 4.15Na20 can produce 4.15X (62 + 1062+360) / 62 = 34.86 sodium feldspar. The albite melting point is 1122'-, so as long as a fraction of the 4.15% Na2O+K2O is used to form the albite, the melting temperature of the raw material is greatly reduced. Therefore, the melting temperature of this raw material may be lower than 1200 °C.
Through the analysis of the crystallization process and phase diagram of the cast stone, the following conclusions can be drawn: (1) Among the cast stone raw materials, SiO 2 , CaO, A 120 3 and Mg 0 play a decisive role in the mineral phase composition. The total amount of iron oxide should be distributed according to 2:1 according to FeO:Fe2O3. (2) In the process of casting stone, FeO and Fe2O3 are added. The initial melting temperature of the material, that is, the final crystallization temperature, can be lowered from 1300 ° C to 1200 ~ 1220 ° C. (3) The poisonous chromium slag is used as the crystallization promoter of the cast stone, which can solve the problem that the cast stone of Jinzhou Cast Stone Factory bursts and causes waste. This is a simple and easy measure to improve the yield of cast stone in Jinzhou Casting Stone Factory.
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