Method for preparing homogeneous mullite material from kyanite
A technology of mullite homogeneous material and kyanite, which is applied in the field of preparation of natural kyanite ore to synthesize mullite homogeneous material, can solve problems such as unretrieved kyanite ore, and achieve suitable large-scale industrialization The production and firing temperature are low, and the effect of improving the utilization rate
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[0018] The preparation method for preparing mullite homogeneous material from kyanite of the present invention includes the following steps:
[0019] a. Take by weight percentage: Al 2 O 3 Kyanite with content ≥0% 60~90%, Al 2 O 3 High alumina bauxite with content ≥85% 0~40%, Al 2 O 3 0~40% of industrial alumina with a content of ≥98%, and 0~1.5% of rare earth oxide as a sintering agent, and 0~1.5% of MgO with a purity of ≥98.5%; said rare earth oxide CeO 2 , La 2 O 3 Or Y 2 O 3 Any of
[0020] b. Co-milling and mixing by wet method or dry method, the particle size is less than 0.074mm, semi-dry machine pressing or wet extruding into a block body, drying to moisture content less than 1.0%;
[0021] c. Place the dried body at a temperature of 1460~1600℃ and roast it, keep it for 8~16 hours, and then cool to room temperature to obtain Al 2 O 3 The content is 45~70%, the volume density is 2.3~2.8g / cm 3 The product.
[0022] The mullite homogeneous material Al prepared by the invention 2 ...
Example Embodiment
[0023] Example 1:
[0024] Taken by weight percentage: Al 2 O 3 46% content, particle size Kyanite <0.074mm 100%, mixed uniformly in a wet ball mill, dehydrated by press filter, vacuum squeezed mud to make mud, dried and put into the kiln, kept at 1470°C for 8 hours, and cooled to room temperature to obtain the product.
Example Embodiment
[0025] Example 2:
[0026] Taken by weight percentage: Al 2 O 3 53% content, particle size Kyanite <0.074mm 100%, dry mixed uniformly, add 6% water (or 8% pulp waste), press into a blank, dry it and put it into the kiln, keep it at 1500℃ for 10 hours, and cool it to room temperature to get the product.
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