tailieunhanh - Extractive Metallurgy of Copper Part 6

Tham khảo tài liệu 'extractive metallurgy of copper part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ausmelt lsasmelt Matte Smelting 127 c Sterlite smelter Tuticorin India 1995 d Union Miniére secondary copper smelter Chapter 22 Hoboken Belgium 1997 e Yunnan Copper smelter under construction at Kunming China startup 2001 . Other Coppermaking Uses of Ausmelt Isasmelt Technology Ausmelt Isasmelt smelting is the outgrowth of technology originally designed for use in tin smelting Robilliard 1994 . Ausmelt in particular have been active since then in developing uses for their furnace beyond sulfide matte smelting Hughes 2000 . One of these is matte converting which has been demonstrated on a small scale. The Ausmelt furnace for converting is similar to that used for smelting Mounsey el al. 1999 . In fact in small smelters smelting and converting can be performed in the same furnace Mounsey et al. 1998 . The matte slag mixture produced by smelting is allowed to settle the slag is tapped and the lance is reinserted into the matte for converting. A two-step process is used. It begins by converting the matte to molten Cu2S white metal followed by tapping slag. It is finished by oxidizing the Cu s to copper and SOj. As in the case of smelting magnetite in the slag appears to act as a catalyst for the converting reactions. The process is autothermal although some coal is added to reduce the copper oxide content of the slag to about 15 Cu. The first Ausmelt furnace specifically dedicated to matte converting recently came on-line in the Houma copper smelter in China Mounsey et al. 1999 . Unfortunately discontinuous two-step smelting converting sends an intermittent stream of so2 to acidmaking. For this reason it is unlikely to become prominent. Ausmelt technology is also useful for recovering copper from non-sulfide materials particularly slags and sludges Hughes 2000 . Its ability to control air and fuel inputs means that conditions can be changed from oxidizing to reducing without transferring material to a second furnace. This is particularly effective for smelting Cu .