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Recovery of Manganese from Steel Plant Slag by Carbarnate Leaching

By Mcintosh, Synthia N.

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Book Id: WPLBN0000139490
Format Type: PDF eBook
File Size: 3.6 MB
Reproduction Date: 2005
Full Text

Title: Recovery of Manganese from Steel Plant Slag by Carbarnate Leaching  
Author: Mcintosh, Synthia N.
Volume:
Language: English
Subject: Health., Medical research, Medical reports
Collections: Medical Library Collection
Historic
Publication Date:
Publisher: Centers for Disease Control and Prevention

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Mcintosh, S. N. (n.d.). Recovery of Manganese from Steel Plant Slag by Carbarnate Leaching. Retrieved from http://members.worldlibrary.net/


Excerpt
ABSTRACT: The U.S. Bureau of Mimes investigated the feasibility of using ammonium carbamate (NH$O,NH,) leaching to recover manganese from steel plant slag. This investigation showed that treatment of the slag in hydrogen prior to leaching enhanced manganese extraction. Up to 80 pct of the manganese and 50 pct of the iron could be extracted from a silicon steel slag that had been pretreated in hydrogen at 700' C. Two 4-h leaching stages conducted at ambient temperature with a solution containing ammonia and carbon dioxide dissolved manganese and iron as their carbamate complexes. Heating the pregnant solution to 6.5' to 85' C decomposed the complexes and precipitated the metals as insoluble carbonate salts. Ammonium carbamate leaching of other slags from several steelmaking plants produced lower manganese extractions, which suggests that the method cannot be applied satisfactorily to all steelmaking slags.

Table of Contents
CONTENTS Page Abstract ........................................................................... Introduction ........................................................................ Experimentalprocedures .............................................................. Materials and sample preparation ...................................................... Pretreatment of samples ............................................................. Leaching ........................................................................ Manganese precipitation ............................................................. Results ........................................................................... Characterizationofdagsamples ....................................................... Slagpretreahnent .................................................................. Pretreatment with other gases ......................................................... Effect of leaching time .............................................................. Evaluationofparticlesize ............................................................ Effect of pulp density on carbamate leaching .............................................. Composition of carbamate leach solution ................................................ Multiple-stage leaching .............................................................. Precipitation of manganese and iron from carbamate solutions ................................. Ammonium carbamate leaching of other steelmaking slags ................................... Summaryandconclusions .............................................................. References .........................................................................

 

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