ĐÁNH GIÁ KHẢ NĂNG TÁCH ĐỒNG KHỎI RÁC THẢI ĐIỆN THOẠI DI ĐỘNG BẰNG PHƯƠNG PHÁP HỎA LUYỆN KẾT HỢP THỦY LUYỆN

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Tác giả: Minh Quý Bùi, Thị Hồng Hoa Nguyễn, Thị Huệ Nguyễn, Thị Ngọc Linh Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2022

Mô tả vật lý: tr.61 - 67

Bộ sưu tập: Metadata

ID: 332641

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The recovery of metals in mobile phone waste is a matter of concern due to environmental issues and the increasingly depleted metal resources. There are many methods to separate metal from mobile phone waste such as: pyrometallurgical method, hydrometallurgical method, electrometallurgical method.... Promoting the advantages of pyrometallurgical method and hydrometallurgical method, the article presents a copper separation process that minimizes the release of harmful gases to the environment, but effectively recovers copper, which is a combination of pyrometallurgical method and hydrometallurgical method. Pyrometallurgical stage: mobile phone waste is chopped and calcined at 750 oC in a closed furnace that can recover the released gas in 2 hours. Hydrometallurgical stage: the solid is dissolved in a solution of sulfuric acid (H2SO4) in the presence of hydrogen peroxide (H2O2). The factors affecting the copper separation process were studied such as H2SO4 concentration, H2O2 concentration, solid/liquid ratio and temperature showing that H2SO4 4M, H2O2 15%, solid-liquid ratio 0.025 and the temperature 40 oC, the copper (II) sulfate (CuSO4) solution obtained has a high concentration with separation efficiency of 71.64% after 1 hour.Việc thu hồi các kim loại trong rác thải điện thoại di động là vấn đề đang được quan tâm do liên quan đến vấn đề môi trường và nguồn tài nguyên kim loại ngày càng cạn kiệt. Có nhiều phương pháp để tách kim loại ra khỏi rác thải điện thoại di động như: phương pháp hỏa luyện, phương pháp thủy luyện, phương pháp điện luyện.... Phát huy ưu điểm của các phương pháp hỏa luyện và thủy luyện, bài báo đưa ra quy trình tách đồng giảm thiểu sự thoát khí độc hại ra môi trường, mà hiệu quả thu hồi đồng hiệu quả, đó là kết hợp phương pháp hỏa luyện và phương pháp thủy luyện. Giai đoạn hỏa luyện: phế liệu điện tử được cắt nhỏ và nung ở 750 oC trong lò kín có thể thu hồi khí thoát ra trong 2 giờ. Giai đoạn thủy luyện: chất rắn được hòa tan trong dung dịch axit sunfuric (H2SO4) có mặt của hidro peroxit (H2O2). Các yếu tố ảnh hưởng đến quá trình hòa tách đồng được nghiên cứu như nồng độ H2SO4, nồng độ H2O2, tỷ lệ rắn/ lỏng và nhiệt độ cho thấy nồng độ H2SO4 4M, H2O2 15%, tỷ lệ rắn - lỏng là 0,025 và nhiệt độ 40 oC thì dung dịch đồng (II) sunfat (CuSO4) thu được có nồng độ cao với hiệu suất tách đạt 71,64% sau 1 giờ.

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