公开(公告)号：WO03031334A3

公开(公告)日：2003-07-31

申请号：PCT/US0232215

申请日：2002-10-08

Applicant: HERITAGE ENVIRONMENTAL SERV

Inventor： FRAME SCOTT W ,  WILSON SHANNON R ,  BRATINA JAMES E

IPC: C22B5/10 ,  C22B5/16 ,  C22B7/02 ,  C22B19/30 ,  C22B19/34 ,  C01G9/02

CPC classification number: C22B5/10 ,  C22B5/16 ,  C22B7/02 ,  C22B19/30 ,  C22B19/34 ,  Y02P10/212

Abstract: A process for separating and recovering a desired metal as metal oxide from raw material is provided. The process includes placing the raw material and a reductant in a container to form a reducing microclimate within the container. A housing having an oxidizing atmosphere is heated to maintain a temperature zone within the housing at a heating temperature sufficient to expose the raw material in the container to a reaction temperature. The container containing the raw material is conveyed through the temperature zone in the housing to expose the raw material and the reductant to the reaction temperature wherein the metal oxide is reduced to a gaseous metal that exits the container. Once outside the container, the gaseous metal is exposed to the oxidizing atmosphere of the temperature zone wherein the desired metal is oxidized to metal oxide and the metal oxide is collected. In preferred embodiments, the raw material is EAF dust and the desired metal is zinc. In one specific embodiment, the process also includes maintaining a second temperature zone in the housing at a metal halide vaporization temperature, which is lower than the heating temperature. A flow of air is applied through the housing in a direction that is opposite to a direction of travel of the container during the conveying step, whereby a metal halide in the raw material is volatilized to a volatilized metal halide when the container is conveyed through the second heating zone. The volatilized metal halide is then collected.

Abstract translation: 提供了从原料中分离和回收所需金属作为金属氧化物的方法。 该方法包括将原料和还原剂放置在容器中以在容器内形成还原微气候。 加热具有氧化气氛的壳体，以将壳体内的温度区域保持在足以将容器中的原料暴露于反应温度的加热温度。 容纳原料的容器通过壳体中的温度区域传送，以将原料和还原剂暴露于反应温度，其中金属氧化物被还原成离开容器的气态金属。 一旦在容器外面，气态金属暴露于温度区的氧化气氛中，其中所需金属被氧化成金属氧化物并且收集金属氧化物。 在优选的实施方案中，原料是EAF粉，所需的金属是锌。 在一个具体实施方案中，该方法还包括在低于加热温度的金属卤化物蒸发温度下保持壳体中的第二温度区域。 在输送步骤期间，通过壳体沿与容器的行进方向相反的方向施加空气流，由此当容器被输送通过该原料时，原料中的金属卤化物挥发成挥发的金属卤化物 第二加热区。 然后收集挥发的金属卤化物。