A mechanistic study into the reactions of ammonium nitrate with pyrite

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• 作者：Richard Gunawan ; Sawsan Freij ; Dong-ke Zhang ; Fiona Beach and Michael Littlefair
• 关键词：Ammonium nitrate ; Combustion ; Environment ; Pyritic shale ; Reaction engineering ; Safety
• 刊名：Chemical Engineering Science
• 出版年：2006
• 出版时间：September 2006
• 年：2006
• 卷：61
• 期：17
• 页码：5781-5790
• 全文大小：627 K

文摘

The reaction of ammonium nitrate with pyrite was studied using a simultaneous differential scanning calorimetry and thermogravimetric analyser (TGA/DSC). When a mixture of pyrite and ammonium nitrate is heated at a constant heating rate of from room temperature to , two exothermic reactions occur at about 200 and , respectively. The first exothermic reaction is considered to take place between ammonium nitrate and pyrite where NO, style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TFK-4JXH3RH-2&_mathId=mml14&_user=10&_cdi=5229&_rdoc=23&_handle=V-WA-A-W-BE-MsSWYVW-UUA-U-AAZCWABWWY-AAZWDEVUWY-VWUWAAYV-BE-U&_acct=C000050221&_version=1&_userid=10&md5=8c6a255d5b7f4d9c4ffebc25352d2ccd"" title=""Click to view the MathML source"">NH<sub>3sub>, style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TFK-4JXH3RH-2&_mathId=mml15&_user=10&_cdi=5229&_rdoc=23&_handle=V-WA-A-W-BE-MsSWYVW-UUA-U-AAZCWABWWY-AAZWDEVUWY-VWUWAAYV-BE-U&_acct=C000050221&_version=1&_userid=10&md5=44237057edb8fcd5238753e85d13a1c5"" title=""Click to view the MathML source"">SO<sub>2sub> and style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TFK-4JXH3RH-2&_mathId=mml16&_user=10&_cdi=5229&_rdoc=23&_handle=V-WA-A-W-BE-MsSWYVW-UUA-U-AAZCWABWWY-AAZWDEVUWY-VWUWAAYV-BE-U&_acct=C000050221&_version=1&_userid=10&md5=20f104c82ab53bfef537bcb6c2de933b"" title=""Click to view the MathML source"">N<sub>2sub>O gases are produced. The second exothermic reaction is due to the oxidation of the remaining pyrite by atmospheric oxygen. Based on the quantitative analysis of the gaseous and solid products of the reaction, a new overall reaction is proposed at the first exothermic peak of interest, which is thermodynamically favourable. The results have significant implication in the understanding of stability of ammonium nitrate-based industrial explosives in reactive mining grounds containing pyritic minerals.