Study on the Direct Firing of Bauxite Tailings to Prepare Ceramic Materials and Their Mechanical Properties
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摘要:
为实现铝土矿尾矿的资源化利用，以铝土矿尾矿为原料，通过直接烧成工艺制备得到刚玉-莫来石基陶瓷材料。该试验主要研究了铝土矿尾矿高温烧成过程中的物相转变行为与形貌变化规律，以及烧成温度对陶瓷力学性能的影响。结果显示，随着烧成温度的升高，样品的物相组成由一水硬铝石、高岭石和伊利石最终转变为刚玉和莫来石等，样品的形貌越来越致密直到形成大量玻璃相，样品的体积密度和抗压强度先变大后减小，当烧成温度为1 100℃时，样品的抗压强度达到最高值225 MPa。
Abstract:In order to realize the resource utilization of bauxite tailings, the study used bauxite tailings as raw materials and prepared corundum-mullite-based ceramic materials by direct firing process. This experiment mainly studied the phase transition behavior and morphological change law of bauxite tailings during high-temperature firing, and the influence of firing temperature on the mechanical properties of ceramics. The results showed that with the increase of firing temperature, the physical phase composition of the sample was finally transformed into corundum and mullite, etc. from duralum hydrate, kaolinite and illite, etc. The morphology of the sample became more and more dense until a large number of glass phases were formed, the bulk density and compressive strength of the sample first became larger and then decreased, and when the firing temperature was 1 100℃, the compressive strength of the sample reached the highest value of 225 MPa.
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Key words:
- bauxite tailings /
- phase transition /
- ceramics /
- bulk density /
- compressive strength
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图 4 不同温度下烧成样品的SEM图：(a)500 ℃, (b)700 ℃, (c) 900 ℃, (d)1 000 ℃, (e)1 100 ℃, (f)1 200 ℃.
Figure 4.
表 1 铝土矿尾矿的化学组成
Table 1. Chemical composition of bauxite tailings
/% 成分 Al2O3 SiO2 Fe2O3 K2O TiO2 SO3 CaO MgO P2O5 Na2O 含量 44.57 35.01 11.18 3.77 3.03 0.77 0.83 0.45 0.21 0.11 
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