Alkaline leaching of zinc from electric arc furnace steel dust

被引：223

作者：

Dutra, AJB ^{[1
]}

Paiva, PRP ^{[1
]}

Tavares, LM ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, COPPE, Dept Met & Mat Engn, Rio De Janeiro, Brazil

来源：

MINERALS ENGINEERING | 2006年 / 19卷 / 05期

关键词：

leaching; flue dust; waste processing;

D O I：

10.1016/j.mineng.2005.08.013

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Electric arc furnaces (EAF) generate about 10-20 kg of dust per metric toil of steel, which constitute a hazardous waste, known as EAF dust. This dust contains a remarkable amount of non-ferrous Metals, Which include zinc, cadmium, lead, chromium and nickel that could be recovered, reducing the environmental impact of the leachable toxic metals., and generating revenue. In this paper, different alkaline leaching techniques were tested in order to dissolve the zinc present in an EAF dust: (i) conventional agitation leaching; (ii) pressure leaching; (iii) conventional leaching following a microwave pretreatment and (iv) leaching with agitation provided by an ultra-sonic probe. Temperature and sodium hydroxide concentration were the variables tested. The highest zinc recovery from the EAF dust, containing about 12% of zinc, was about 74%. This was achieved after 4 h of leaching in a temperature of 90 degrees C and with a sodium hydroxide concentration of 6 M of the leaching agent. (C) 2005 Elsevier Ltd. All rights reserved.

引用

页码：478 / 485

页数：8

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