Nghiên cứu kết cấu vi mô của xỉ thép trước khi đưa vào hấp thụ và loại bỏ chất ô nhiễm trong nước=A study of microstructure of steel slags used for pollutants adsorption and removal in waste water

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Tác giả: Thị Nương Nguyễn, Xuân Sang Nguyễn, Tiến Dũng Phạm, Hữu Long Trần, Thị Thu Trang Trần, Hoàng Tùng Võ

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Thông tin xuất bản: TC Khoa học trái đất và môi trường – ĐH Quốc gia Hà Nội, 2018

Mô tả vật lý: tr.45666

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ID: 474272

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"Waste treatments waste" – the reuse of waste could bring a number of environmental and economical benefits such as reducing waste and treatment cost in many industrial sectors. This study made use of steel slag as treatment material for polluted waste. High performance of fill teration may come with the parameters of volumetric mass density of steel slag is 3.1 ~ 3.6 g/cm3, standard screen is 0.175 mm, weight density powder is about 0.174g/cm3, surface is about 0.32 m2/g, average size is 5.3 nm. Chemical components of steel slag analyzed by XRF (X-ray fluorescence spectrometer), which shows CaO is the main component of steel slag, 48.2% and 42.5% were steel slag and steel slag powder, respectively. The following major components are Fe2O3 and MgO content. Metals content determined by TCLP (Toxicity Characteristic Leaching Procedure) that shows Pb, Hg, Cd, Cr, As, Ni, Cu, Mn, Zn content which is less than National Standard II (GB 3838-2002)
structure of steel slag analyzed by SEM (Scanning Electron Spectroscopy) and XRD (X-Ray diffraction) which shows include magnetite, tri-calcium silicate (Ca3S), di-calcium silicate (Ca2S), and iron in tin (FeO). Arsenic absorption and removal by steel slag are simple and possibly experimental and that can apply in large-scale so any effective from that point efficient.Hướng tiếp cận "sử dụng chất thải để xử lý chất thải” có thể tái sử dụng chất thải nhằm mang lại lợi ích về môi trường thông qua khả năng giảm thiểu chất thải vào môi trường và đồng thời mang lại lợi ích về kinh tế cho các ngành xử lý chất thải bằng cách hạn chế phần lớn chi phí xử lý. Nghiên cứu này ứng dụng xỉ thép để làm nguyên vật liệu xử lý ô nhiễm môi trường. Mật độ thể tích của xỉ thép là 3.1~3.6 g/cm3, thông qua tiêu chuẩn sàng là 0.175 mm, mật độ thể trọng của bột xỉ khoảng 1.74 g/cm3, so với bề mặt khoảng 0.32 m2/g, kích thước trung bình là 5.3 nm, đạt các tiêu chuẩn đó sẽ cho hiệu suất lọc tốt. Kết quả phân tích thành phần hóa tính cơ bản của xỉ thép bằng quang phổ XRF cho thấy thành phần chủ yếu của xỉ thép trong thực nghiệm là CaO, hàm lượng 48.2% trong xỉ thép và 42.3 % trong bột xỉ thép, tiếp theo là hàm lượng Fe2O3 và MgO
xác định hàm lượng kim loại nặng trong xỉ thép bằng phương pháp TCLP (Toxicity Characteristic Leaching Procedure) cho thấy trong xỉ thép hàm lượng Pb, Hg, Cd, Cr, As, Ni, Cu, Mn, Zn đều rất ít, thấp hơn nhiều so với tiêu chuẩn II trong nước (GB 3838-2002)
phân tích kết cấu vi mô của xỉ bằn quét điện tử (SEM) cho biết kết cấu hình dạng thật của xỉ thép và phân tích nhiễu xạ (XRD) cho biết thành phần xỉ thép magnetit, tricalcium silicat (Ca3S), dicalcium silicat (Ca2S), sắt trong thiếc (FeO). Lựa chọn phương pháp xỉ thép hấp phụ chất ô nhiễm có thể là phương pháp đơn giản, hiệu quả để đưa vào thực nghiệm và áp dụng trên qui mô rộng cho hiệu quả cao.

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