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Synthesis of high alumina refractories from lithomargic clay

机译：用立陶宛粘土合成高铝耐火材料

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摘要

Lithomargic clay underlying Awaso bauxite deposits consists mainly of kaolinite and minor fractions of gibbsitc. Gibbsite, useful as a source of alumina, was separated from kaolinite. Gibbsite was added to lithomargic clay in various amounts, using Mfensi clay as a binder, and fired at 1350 °C for 2 h. Linear firing shrinkage, density, porosity, water absorption and cold crushing strength were used to characterize the fired bricks. The inineralogical compositions in the fired bricks were analyzed by X-ray diffraction techniques. The results showed that increasing the gibbsite amount up to 40 wt% increased the firing shrinkage and density whilst the apparent porosity and water absorption values decreased. Increasing the gibbsite amount enhanced mullite and corundum formation whilst the formation of free-silica phases was inhibited. The cold crushing strength increased linearly with increasing gibbsite content.
机译：Awaso铝土矿床下的碎石粘土主要由高岭石和少量的gibbsitc组成。从高岭石中分离出了用作矾土来源的三水铝石。以Mfensi黏土为黏合剂，将硅灰石以不同的量添加到同石粘土中，并在1350°C下烧制2 h。使用线性烧成收缩率，密度，孔隙率，吸水率和冷抗碎强度来表征烧成砖。通过X射线衍射技术分析了烧砖中的inerologicical组成。结果表明，将三水铝石的量增加至40 wt％会增加烧成收缩率和密度，而表观孔隙率和吸水率降低。增加三水铝石的量可以增强莫来石和刚玉的形成，同时可以抑制游离二氧化硅相的形成。随着三水铝石含量的增加，冷压强度呈线性增加。

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