Investigations of geopolymeric mixtures based on phosphate washing waste

Science and Technology of Materials Pub Date : 2018-12-01 DOI:10.1016/j.stmat.2018.08.001

R. Dabbebi , S. Baklouti , J.L. Barroso de Aguiar , F. Pacheco-Torgal , B. Samet

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引用次数: 9

Abstract

The extraction of the phosphate ore produces a high amount of waste causing serious environmental problems. This waste, termed as phosphate washing waste, was filtered and dried at 105 °C for 24 h to remove the water. The dried waste was milled and then sieved in a 100 μm sieve. The resulting phosphates washing waste (PWW) particles size are below 70 μm. The phosphate washing waste was calcined at 700 °C and 900 °C. Both calcined and uncalcined waste were investigated with X-ray fluorescence (XRF), X-ray powder diffraction (DRX), Fourier transform infrared (FTIR), simultaneous differential thermal and thermogravimetric analyses (DTA-TG) and particle size analysis. This waste was activated with sodium hydroxide (NaOH) and sodium silicate in order to produce geopolymeric materials. The influence of replacing PWW by 15% of metakaolin was also study. The results show that the highest compressive strength is obtained with metakaolin. The results also showed that compressive strength decreased with the increase of NaOH concentration.

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以磷酸洗涤废渣为基料的地聚合物混合物研究

磷矿的提取产生了大量的废物，造成了严重的环境问题。该废物被称为磷酸盐洗涤废物，在105°C下过滤和干燥24小时以去除水分。将干燥后的废渣进行研磨，然后在100 μm的筛子中过筛。所得洗磷废渣(PWW)粒径均小于70 μm。将洗磷废液分别在700℃和900℃下煅烧。采用x射线荧光(XRF)、x射线粉末衍射(DRX)、傅里叶变换红外(FTIR)、同步差热分析和热重分析(DTA-TG)和粒度分析对煅烧和未煅烧的废石进行了研究。用氢氧化钠(NaOH)和硅酸钠对其进行活化，制备地聚合物材料。研究了用15%偏高岭土替代PWW的影响。结果表明，偏高岭土的抗压强度最高。抗压强度随NaOH浓度的增加而降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Science and Technology of Materials

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