| 范兆如,周守勇,李梅生,赵宜江,邢卫红.基于低品位凹凸棒石黏土的陶瓷膜支撑体制备[J].材料导报,2018,32(20):3638-3644, 3659 |
| 基于低品位凹凸棒石黏土的陶瓷膜支撑体制备 |
| Preparation of Low Grade Attapulgite Clay Porous Supports for Ceramic Membranes |
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| DOI：10.11896/j.issn.1005-023X.2018.20.026 |
| 中文关键词: 凹凸棒石黏土 陶瓷膜支撑体 烧结 耐酸碱腐蚀 |
| 英文关键词: attapulgite clay, ceramic membrane support, sintering, acid and alkali corrosion resistance |
| 基金项目:国家自然科学基金(21476094；21406082);江苏省自然科学基金(BK20171268);淮安市科技支撑项目(HAG201609)；江苏省高校“青蓝工程”资助项目 |
| 作者 | 单位 | E-mail | | 范兆如 | 南京工业大学化工学院,材料化学工程国家重点实验室,国家特种分离膜材料工程技术中心,南京 210009
淮阴师范 学院化学化工学院,江苏省环境功能材料工程实验室,江苏省低维材料化学重点实验室,淮安 223300 | 13327969153@163.com,yjzhao@hytc.edu.cn | | 周守勇 | 淮阴师范 学院化学化工学院,江苏省环境功能材料工程实验室,江苏省低维材料化学重点实验室,淮安 223300 | | | 李梅生 | 淮阴师范 学院化学化工学院,江苏省环境功能材料工程实验室,江苏省低维材料化学重点实验室,淮安 223300 | | | 赵宜江 | 淮阴师范 学院化学化工学院,江苏省环境功能材料工程实验室,江苏省低维材料化学重点实验室,淮安 223300 | 13327969153@163.com,yjzhao@hytc.edu.cn | | 邢卫红 | 南京工业大学化工学院,材料化学工程国家重点实验室,国家特种分离膜材料工程技术中心,南京 210009 | |
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| 中文摘要: |
| 多孔陶瓷膜支撑体是陶瓷膜制备与应用的基础,是支撑膜层的关键因素,为陶瓷膜提供一定的机械强度和耐腐蚀性能。由于支撑体材质单一,原料不易烧结且造价成本高等原因,各国学者开始寻找一些新的、更廉价的原料(如硅藻土、粘土、高岭土、粉煤灰等)来代替氧化铝作为制备支撑体的原材料,并取得了一定的进展。本工作采用低品位凹凸棒石黏土制备多孔陶瓷膜支撑体,系统研究了原料配比、成型压力、烧结温度和添加剂对支撑体性能的影响。结果表明:凹凸棒石黏土中加入适量的氧化铝作为骨料,能够有效阻止支撑体在烧结过程中的过度收缩,使其收缩率由(30±0.12)%降低到(3.1±0.05)%,支撑体的机械强度和孔隙率大幅增加。支撑体孔隙率随造孔剂添加量增加而增大,机械强度随造孔剂添加量增加而降低。支撑体的机械强度随成型压力增加而变大,孔隙率随成型压力增加而减少。支撑体的机械强度随烧结温度的升高而增大,当烧结温度超过750 ℃时,凹凸棒石黏土结构开始坍塌,支撑体致密化开始形成,孔隙率显著降低。当凹凸棒石黏土含量为 63%,氧化铝含量为 29%,造孔剂含量为6%,干压压力为10 MPa,烧结温度700 ℃时,支撑体性能最优,平均机械强度为(18.11±1.83) MPa,孔隙率为(45.94±0.49)%。 |
| 英文摘要: |
| Porous ceramic membrane support is the basis of ceramic membrane preparation and application, which is the key factor of supporting membrane layer. It provides certain mechanical strength and corrosion resistance for ceramic membrane. Preparation of the ceramic membrane with inexpensive raw materials, such as diatomite, kaolin and fly ash instead of alumina and lower sintering temperature would be beneficial to reduce the cost of the ceramic membranes and consolidate their applications in industrial processes. This work aimed to develop low-cost ceramic membrane supports from low-grade attapulgite clay (ATP). The effects of raw material ratio, pressing pressure, sintering temperature, pore forming agent and sintering additives on the microstructure and performance of the support were systematically studied. The results showed that the addition of appropriate amount of alumina in attapulgite clay can effectively prevent the excessive shrinkage of the support during sintering, and reduce its shrinkage rate from (30±0.12)% to (3.1±0.05)%, which greatly increased the mechanical strength and porosity of the support. The porosity of the support increased with the increase of the amount of pore-forming agent, while the mechanical strength decreased. The mechanical strength increased with the increase of pressing pressure and the porosity decreased. The mechanical strength increased with the increase of sintering temperature. When the sintering temperature exceeded 750 ℃, the attapulgite structure began to collapse, support began to form densification, and the porosity decreased significantly. When the content of attapulgite clay was 63%, alumina was 29%, pore-forming agent was 6%, the pressing pressure was 10 MPa, and the sintering temperature was 700 ℃, the perfor-mance of the support was optimal, the average mechanical strength was (18.11±1.83) MPa, and the porosity was (45.94±0.49)%. |
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