Nghiên cứu khả năng sử dụng xỉ luyện thép làm chất trợ dung khử tạp chất của gang lỏng trong quy trình tiền xử lý

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Tác giả: Cao Sơn Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Việt Nam - B, 2022

Mô tả vật lý: tr.55

Bộ sưu tập: Metadata

ID: 329572

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In this study, a flux, mixture of basic oxygen furnace (BOF) slag and CaO powder, was investigated the ability of the slag recycling in a pre-treatment process. The first step of the experimental procedure was to melt iron using a high-frequency induction furnace, then 3 kg of flux was embedded into the metal. There were two kinds of experimental conditions including with and without Argon gas protection of the furnace. After ten minutes from the moment of adding the flux, the metal and slag samples were taken out for chemical composition analysis. The results showed that Sulphur (S) content of the iron significantly decreased by 38% and 19% with and without the Argon gas protection, respectively. Meanwhile, the Phosphorus (P) content of the iron was concluded to be independent of the conditional experiments. Besides, the Fe content of the slag decreased in both cases of experiments.Trong nghiên cứu này, xỉ luyện thép được chuẩn bị và phối trộn với CaO, tạo ra chất trợ dung trước khi đưa vào trong gang lỏng để đánh giá khả năng khử tạp chất của xỉ. Gang được nấu chảy trong lò cảm ứng trung tần trước khi nạp 0,3 kg chất trợ dung gồm có xỉ và CaO vào lò. Thí nghiệm thực hiện với 2 điều kiện khác nhau là có và không có khí Argon bảo vệ trên bề mặt gang lỏng. Sau khoảng thời gian 10 phút tính từ thời điểm nạp chất trợ dung, xỉ và gang được lấy mẫu để phân tích thành phần. Kết quả cho thấy, thí nghiệm trong điều kiện thổi và không thổi khí Argon có ảnh hưởng rõ rệt đến khả năng khử lưu huỳnh (S) của gang lỏng khi sử dụng xỉ luyện thép làm chất khử. Khi không có khí bảo vệ, khả năng khử S của gang chỉ là 19%. Trong khi đó, 38% S trong gang lỏng được khử bỏ khi có khí Argon bảo vệ trên bề mặt gang lỏng. Mặc dù vậy, khả năng khử phốt pho (P) là chưa hiệu quả trong cả hai điều kiện thí nghiệm. Bên cạnh đó, hàm lượng sắt (Fe) trong xỉ đã giảm bởi oxit sắt trong gang bị hoàn nguyên một phần.

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