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Tái sử dụng bã kính chì và chất thải bột nhôm để tổng hợp gạch xây dựng geopolymer
Tóm tắt
Bài báo này trình bày việc tổng hợp gạch geopolymer từ bã kính chì (LGS) và chất thải bột nhôm (AFF). Chất thải AFF đã được xử lý hóa học để chuẩn bị bột natri aluminate (NaAlO2). Các tham số thành phần như nguồn silicat (LGS chưa xử lý và LGS được xử lý nhiệt ở 600 °C (LGS600)) và nồng độ natri oxit (Na2O) (dưới dạng NaAlO2) đã ảnh hưởng đến các tính chất vật lý và cơ học (cường độ nén, khả năng hấp thụ nước và mật độ thể tích) của các viên gạch được chế tạo. Hàm lượng chất hữu cơ cao trong LGS đã gây ra hiệu ứng trì hoãn trong quá trình địa polymer hóa, dẫn đến sự hình thành gạch cứng với cường độ nén ở 90 ngày khá khiêm tốn (từ 2.13 đến 4.4 MPa). Việc sử dụng LGS600 đã cải thiện các tính chất cơ học của viên gạch, đạt được cường độ nén tối đa trong 90 ngày là 22.35 MPa tại 3 wt.% Na2O. Hydrat natri aluminosilicate là sản phẩm kích hoạt chính trong tất cả các mẫu, được xác nhận bởi phân tích nhiễu xạ tia X và phân tích nhiệt. Thử nghiệm rửa bằng axit acetic cũng chứng minh rằng tất cả các hỗn hợp LGS600-NaAlO2 đều có nồng độ Pb trong nước rửa thấp hơn mức cho phép theo các quy trình rửa đặc trưng, cho thấy việc giảm thiểu các vấn đề môi trường do những chất thải này gây ra.
Từ khóa
#gạch geopolymer #bã kính chì #chất thải bột nhôm #natri aluminate #cường độ nén #môi trườngTài liệu tham khảo
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