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THE CONVERSION OF LEAD SULFATE TO LEAD CARBONATE IN SODIUM-CARBONATE MEDIA
Alternative TitleHydrometallurgy
GONG, Y; DUTRIZAC, JE; CHEN, TT
1992-04-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume28Issue:3Pages:399-421
AbstractThe reaction of sized PbSO4 powders with Na2CO3 media has been investigated over a broad range of experimental conditions. The reaction obeys the shrinking core model incorporating diffusion through the product layer formed on the particles. The rate increases as the first power of the Na2CO3 concentration and decreases with increasing concentrations of the Na2SO4 reaction product. The rate is independent of NaNO3 additions, but decreases with increasing concentrations of NaCl or KCl. At a given Na2CO3 concentration, the rate decreases as the pH decreases because of the conversion of CO32- ions to HCO3-. The rate decreases significantly when the pH is raised from 11.5 to 12.0, and this decrease is attributed to changes in the reaction products/product morphologies. At pH values > 12, the PbSO4 dissolves in the solution. The PbSO4 conversion rate increases with increasing temperature, and the apparent activation energy is 15.8 kJ/mol. Hydrocerussite, Pb3(CO3)2(OH)2, is formed under mild reaction conditions, but the formation of NaPb2(CO3)2(OH) is favoured by long retention times, high Na2CO3 or NaCl concentrations and elevated temperatures. The experimental results support a mechanism based on rate control by the diffusion of carbonate ions through the solution trapped in the pores of the constantly thickening product layer formed on the agglomerated PbSO4 particles.; The reaction of sized PbSO4 powders with Na2CO3 media has been investigated over a broad range of experimental conditions. The reaction obeys the shrinking core model incorporating diffusion through the product layer formed on the particles. The rate increases as the first power of the Na2CO3 concentration and decreases with increasing concentrations of the Na2SO4 reaction product. The rate is independent of NaNO3 additions, but decreases with increasing concentrations of NaCl or KCl. At a given Na2CO3 concentration, the rate decreases as the pH decreases because of the conversion of CO32- ions to HCO3-. The rate decreases significantly when the pH is raised from 11.5 to 12.0, and this decrease is attributed to changes in the reaction products/product morphologies. At pH values > 12, the PbSO4 dissolves in the solution. The PbSO4 conversion rate increases with increasing temperature, and the apparent activation energy is 15.8 kJ/mol. Hydrocerussite, Pb3(CO3)2(OH)2, is formed under mild reaction conditions, but the formation of NaPb2(CO3)2(OH) is favoured by long retention times, high Na2CO3 or NaCl concentrations and elevated temperatures. The experimental results support a mechanism based on rate control by the diffusion of carbonate ions through the solution trapped in the pores of the constantly thickening product layer formed on the agglomerated PbSO4 particles.
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
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Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:A1992HK17200011
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/7966
Collection研究所(批量导入)
Affiliation1.ENERGY MINES & RESOURCES CANADA,CANADA CTR MINERAL & ENERGY TECHNOL,MINERAL SCI LABS,OTTAWA K1A 0G1,ONTARIO,CANADA
2.CHINESE ACAD SCI,INST CHEM MET,BEIJING,PEOPLES R CHINA
Recommended Citation
GB/T 7714
GONG, Y,DUTRIZAC, JE,CHEN, TT. THE CONVERSION OF LEAD SULFATE TO LEAD CARBONATE IN SODIUM-CARBONATE MEDIA[J]. HYDROMETALLURGY,1992,28(3):399-421.
APA GONG, Y,DUTRIZAC, JE,&CHEN, TT.(1992).THE CONVERSION OF LEAD SULFATE TO LEAD CARBONATE IN SODIUM-CARBONATE MEDIA.HYDROMETALLURGY,28(3),399-421.
MLA GONG, Y,et al."THE CONVERSION OF LEAD SULFATE TO LEAD CARBONATE IN SODIUM-CARBONATE MEDIA".HYDROMETALLURGY 28.3(1992):399-421.
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