肉段的家常做法
Pressure leaching technique of smelter dust with high-copper and high-arnic
建行个人网上银行登录XU Zhi-feng(徐志峰), LI Qiang(李强), NIE Hua-ping(聂华平)
School of Materials and Chemical Engineering, Jiangxi University of
Science and Technology, Ganzhou 341000, China
关于爱情的名言>我的寒假英语作文Received 6 July 2009; accepted 30 December 2009
Abstract: The application of pressure leaching technology in the treatment of high-copper and high-arnic dust was studied. The pressure leaching technique was determined as follows: the liquid to solid ratio (mL/g) of 5:1, the leaching temperature of 453 K, the retention time of 2 h, the initial sulfuric acid concentration of 0.74 mol/L, the oxygen partial pressure of 0.7 MPa, and the agitation speed of 500 r/min. Under the conditions, 95% of copper and 99% of zinc and only 6% of iron in the dust were
企业人才leached, while about 20% of arnic was also leached. The leaching technique was optimized further to restrain the leaching of arnic by adding a small quantity of ferrous iron into the leaching system (c(Fe2+)=0.036 mol/L). Copper and zinc can be effectively parated from arnic and iron in the leach. The optimal pressure leaching technique of high-copper and high-arnic smelter dust is proved to be effective.
Key words: copper; arnic; smelter dust; pressure leaching
1 Introduction
Copper smelter dust (copper dust) contains veral valuable metals, such as copper, lead, zinc, and bismuth. If copper dust is directly returned to flash smelting furnace, the content of the impurities (arnic, bismuth, and zinc) in the feed materials will be raid greatly and the processing capability of furnace will be reduced. The process of copper electro-refining and the quality of electric copper will be affected greatly by the circulating accumulation of the impurities, such as bismuth, antimony, arnic, and iron. Furthermore, the injurant of arnic concentrates in the fume during the flash smelting, which will shorten the rvice life of vanadium catalyst for the production of sulfuric acid. Therefore, it is necessary to parate copper dust from the copper smelting system and reclaim valu
able metals comprehensively from the dust[1−2]. Hydrometallurgical methods were applied in the treatment of copper dust since 1970’s[3]. The industrial operation proves that hydrometallurgical methods are efficient in the recovery of valuable metals from the metallurgical wastes[4−5].
Abundant rearches were carried out on the hydrometallurgical process of copper dust[6−9]. At prent, most of the large-scale enterpris in China apply a unite technique of hydro- and pyro-metallurgy in the treatment of copper dust, i.e., copper dust is firstly leached by water or dilute sulfuric acid and then the leaching residues are nt to the pyrometallurgical deoxidizing process to produce crude lead[10]. This technique is proved to be effective in the treatment of low-copper smelter dust and the valuable metals can be preliminarily reclaimed. However, this technique is not suitable for the treatment of high-copper and high-arnic flue dust becau the valuable metals of copper and zinc cannot be easily leached with high efficiency and arnic shows strong dispersity in the hydrometallurgical process and cannot be treated with centralization. The treatment of high-copper and high-arnic flue dust is an interesting subject for copper metallurgy.
择天记陈长生The disposal of arnic is a key problem for metallurgical industry and a lot of relevant work has been conducted[11−12]. Several techniques were propod and applied in the treatment of high-arnic dust[13−15]. Although the preliminary paration of arnic from other metals can be achiev
ed by the lective dissolution of arnic, the further process of arnic from the leaching solutions cannot be evaded. Comparatively, the solidification process of arnic through the formation of a stable and insoluble ferric arnate compound in the leaching is much more economical and attractive[16−19].
高血压新标准Corresponding author: XU Zhi-feng; Tel: +86-797-8312412; Fax:+86-797-8312204; E-mail: xzf_
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