Pleonaste-hercynite bricks and preparation method thereof
A technology of iron-aluminum spinel and spinel bricks, which is applied in the field of chromium-free basic refractory materials, can solve problems such as environmental pollution and unsatisfactory product performance, and achieve good alkali corrosion resistance, low production cost, and high physical performance and good structural flexibility
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Embodiment 1
[0023] Embodiment 1: Magnesia-iron-iron-aluminum composite spinel bricks for cement kiln, expressed in weight percentage, raw materials are: 5~3mm high-iron magnesia accounts for 34%, and less than 2mm high-iron magnesia accounts for 27%, less than 0.088mm The high-iron magnesia accounts for 33%, and the iron-aluminum spinel less than 3mm accounts for 6%. In addition, 2-4% of the total weight of the above-mentioned raw materials is added as a binder. The density of the sulfurous acid pulp waste liquid is 1.2 g / cm 3 .
[0024] Among them, the weight composition of high iron magnesia is: MgO 85%, Fe 2 o 3 10%, other impurities 5%; the weight composition of iron-aluminum spinel is: FeO 42%, Al 2 o 3 56%, other impurities 2%.
[0025] Preparation method: Mix the raw materials with a wet mill, shape them with a hydraulic press, put the formed bricks into a drying kiln, dry them at 140°C for 20 hours to make the moisture content ≤0.5%, and then heat them to 1620°C. and kept...
Embodiment 2
[0028] Embodiment 2: Magnesia-iron-iron-aluminum composite spinel bricks for cement kilns, expressed in weight percentage, raw materials are: 32% of high-iron magnesia of 5-3mm, 25% of high-iron magnesia of less than 2mm, and high-iron magnesia of less than 0.088mm 31% of magnesia, 12% of iron-aluminum spinel less than 3mm, and 3% of the total weight of the above-mentioned raw materials are added with waste sulfurous acid pulp. The density of the waste sulfurous acid pulp is 1.3g / cm 3 .
[0029] The weight composition of high iron magnesia is: MgO 90%, Fe 2 o 3 8%, other impurities 2%; the weight composition of iron-aluminum spinel is: FeO 40%, Al 2 o 3 58%, other impurities 2%.
[0030] Preparation method: Mix the raw materials with a wet mill, shape them with a friction press, put the formed bricks into a drying kiln, dry them at 110°C for 24 hours, and heat them to 1650°C. And keep it at this temperature for 3h to burn , the main components of the product are: MgO 83...
Embodiment 3
[0033] Embodiment 3: Magnesia-iron-iron-aluminum composite spinel bricks for cement kiln, expressed in weight percentage, raw materials are: 27% of high-iron magnesia of 5-3mm, 20% of high-iron magnesia of less than 2mm, and high-iron magnesia of less than 0.088mm Magnesia 31%, 5~3mm iron-aluminum spinel 12%, 3 .
[0034] Among them, the weight composition of high iron magnesia is: MgO 80%, Fe 2 o 3 15%, other impurities 5%; the weight composition of ferroaluminum spinel is: FeO 44%, Al 2 o 3 54%, other impurities 2%.
[0035] Preparation method: The raw materials are mixed by a wet mill, shaped by a friction press, put into a drying kiln, dried at 130°C for 17 hours, heated to 1680°C, and fired at this temperature for 5 hours , the main components of the obtained product are: MgO76%, Al 2 o 3 14%, (Fe 2 o 3 +FeO) 9%.
[0036] Its performance indicators are shown in Table 4 below:
[0037]
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