首页>
外国专利>
Processing process of dust and residue containing zinc oxide and zinc ferrite discharged from electric furnaces and other furnaces
Processing process of dust and residue containing zinc oxide and zinc ferrite discharged from electric furnaces and other furnaces
展开▼
机译:电炉及其他熔炉排放的含氧化锌和铁氧体锌的粉尘和残渣的处理工艺
展开▼
页面导航
摘要
著录项
相似文献
摘要
The present invention is a method of recovering valuable metals from a quantity of furnace dust consisting the following steps. A first leaching step wherein the furnace dust is leached at atmospheric pressure in a first leaching solution to produce a first leach liquor and a first leach residue, the first leaching solution consisting of an aqueous mineral acid solution. The first leach liquor is then separated from the first leach residue. A second leaching step is then performed wherein the first leach residue is atmospherically leached in a second leaching solution to form a second leach liquor and a second leach residue, the second leaching solution comprising a solution of aqueous HCl with a reductant. The second leach liquor is then separated from the second leach residue. A zinc precipitation step is then performed wherein zinc is precipitated from the second leach liquor by treating the second leach liquor with a quantity of alkali, the quantity of alkali selected to adjust the pH of the second leach liquor sufficiently to precipitate out the zinc in the form of a zinc salt in a third residue leaving a third liquor and then separating the third residue containing zinc from the third liquor.
展开▼