摘要
2006年中国的锌产量超过300万t,其中约45%的锌浸出渣采用热酸浸出-铁钒除铁工艺处理,使得每年铁钒渣的产出量超过100万t〔1〕。由此总的堆存铁钒渣数量超过2000万t,并导致对环境潜在的污染。铁钒渣中平均含锌量约为6%,总的锌含量达到120万t。另外部分铁钒渣富含稀有金属如Ga、Ge、In和贵金属如Ag等,利用价值非常高。本文提出一种铁钒渣的处理工艺流程。铁钒渣首先在回转窑中焙烧得到含锌烟尘,该烟尘经过浸出-净化-电积生产锌锭。稀有金属在净化过程中回收,最后窑渣浮选得到铁精矿。低浓度SO2烟气经过除尘,吸附和解吸生产液体SO2。该技术能回收铁钒渣中所有有价金属并减少对环境潜在的污染。
In 2006 output of zinc was more than three million tons in China. About 45% of zinc leaching residue is treated by hot acid leaching - iron removal with jarosite. The quantity of jarosite is more than one million tons every year. So the total quantity of jarosite in dumping is more than 20 million tons and will result in pollution to environment. The average content of zinc in jarosite is 6 % and total quantity is more than 1.2 million tons. In addition some of them contain rare metals such as Ga, Ge, In and precious metal such as silver. The value of utilization is very high. This paper developed a flowsheet for treatment of jarosite. Jarosite is firstly roasted by rotary kiln to produce zinc calcine. Then calcine is treated by leaching - purification - eleetrowinning to produce zinc ingots. During purification rare metals are recoveried and kiln slag is treated by flotation to produce iron concentrate. The low SO2 gas after dust collection is absorbed and desorbed to produce liquid SO2. This technology can recovery all valuable metals in jarosite and decrease pollution of jarosite.
出处
《矿冶》
CAS
2009年第1期23-28,共6页
Mining And Metallurgy
关键词
铁钒渣
焙烧
湿法冶金
稀有金属
jarosite
roasting
hydrometallurgy
rare metals
