Preparation and Characterization of Pervious Brick with High Titanium Blast Furnace Slag
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摘要:
这是一篇陶瓷及复合材料领域的论文。为实现高钛型高炉渣固废的再次资源化利用，解决大掺量高钛型高炉渣制备透水砖问题，本文以高炉渣为骨料，高岭土、钾长石为粘结剂和助融剂，经坯体成型、烧结制备了透水砖。采用TG-DSC综合热分析法、SEM形貌分析法研究了物料的热性能及高温下的形貌变化；讨论了高炉渣及辅料的配比、高炉渣骨料的粒度、成型压力、烧结温度、保温时间对透水砖性能的影响，确定了透水砖适宜的制备工艺参数。结果表明：选取高炉渣0.18~0.25 mm，高炉渣∶高岭土∶钾长石（质量分数）配比为75∶10∶15，成型压力为10 MPa，烧结温度为1 095 ℃，保温时间为3 h，此时透水砖的透水系数为0.064 cm/s，抗折强度为12 MPa，具备高透水性和高强度的特性，满足《透水路面砖和透水路面板》（GB/T 25933-2010）的要求。
Abstract:This is an essay in the field of ceramics and composites. In order to realize the reuse of solid waste of high titanium furnace slag and solve the problem of making permeable bricks with large amount of high titanium furnace slag, the permeable bricks were prepared by forming and sintering the billet with the furnace slag as aggregate, kaolin and potassium feldspar as binder and melting aid. TG-DSC comprehensive thermal analysis and SEM morphology analysis were used to study the thermal properties of the material and the morphology change at high temperature. The effects of the proportion of furnace slag and auxiliary materials, the particle size of furnace slag aggregate, forming pressure, sintering temperature and holding time on the properties of permeable bricks were discussed, and the suitable preparation process parameters of permeable bricks were determined. The results show that the ratio of blast furnace slag: Kaolin: K Feldspar (mass fraction) is 75∶10∶15, the molding pressure is 10 MPa, the sintering temperature is 1095 °C, and the holding time is 3 h, the permeability Coefficient of permeable brick is 0.064 cm/s, the flexural strength is 12 MPa, which has the characteristics of high permeability and high strength, and meets the requirements of “Permeable pavement brick and permeable pavement board” (GB/T 25933-2010).
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表 1 原料成分及含量/%
Table 1. Composition and content of blast furnace slag
名称 TiO2 Fe2O3 SiO2 MgO Al2O3 CaO V2O5 F K2O Na2O 高炉渣 23.16 2.64 24.01 7.47 13.49 27.19 0.82 0.12 / / 钾长石 0.08 0.11 74.00 0.10 10.88 0.24 / / 11.8 0.39 高岭土 1.00 0.80 55.70 / 42.50 / / / / / 
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表 2 不同配方试样的透水系数与抗折强度
Table 2. Permeability coefficient and flexural strength of the samples with different formulations
配方比例
（高炉渣∶高岭土∶钾长石）透水系数/(cm/s) 抗折强度/MPa 75∶10∶15 0.0504 12 70∶15∶15 0.0401 13 90∶10∶0 0.122 5 80∶15∶5 0.078 7 60∶20∶20 0.016 13 50∶25∶25 0.006 15
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