tailieunhanh - Extractive Metallurgy of Copper Part 7

Tham khảo tài liệu 'extractive metallurgy of copper part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Continuous Converting 157 The methods by which Mitsubishi Outokumpu and Noranda converting avoid foaming are described in Sections and . Choice of matte grade for continuous converting The matte that continuous converters receive from smelting is 68-75 Cu. Production of this high-Cu matte a generates most of the Fe and s oxidation heat in the smelting furnace where it is needed for heating and melting b gives maximum impurity removal before continuous converting c minimizes slag production in the converting furnace. Minimization of converter slag is important because continuous converting slags a contain 10 to 20 Cu b are usually recycled to smelting to recover this Cu at extra cost . Downward Lance Mitsubishi Continuous Converting See also Chapter 13 Mitsubishi converting blows oxygen-enriched air downwards through lances onto a molten slag matte copper bath Figure . Tables and give operating data. The Mitsubishi converter is used mostly as part of the Mitsubishi continuous smelting converting system Chapter 13 four operating systems in 2002 . It is used in one case to convert the matte from a Noranda smelting furnace Table . Description The Mitsubishi continuous converter consists of a a wall opening for continuously feeding molten matte into the furnace b vertical lances for blowing oxygen-enriched air and limestone flux continuously into the incoming matte c a siphon for continuously underflowing the converter s molten copper product d an overflow hole for continuously overflowing molten slag. It also has an enclosed push-chute for periodically pushing scrap anodes purchased scrap and large reverts through its roof Oshima et al. 1998 . 158 Extractive Metallurgy of Copper Fig. . Mitsubishi downward lance continuous converter m diameter. It converts up to 1500 tonnes of matte per day. The 10 rotating vertical lances are notable. Continuous Convening 159 During operation the converter contains