发明名称 |
Process for the selective recovery of the salt constituents from used hardening shop salts which contain nitrite-nitrate |
摘要 |
In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide without nitrogen oxides arising, and, by evaporation and cooling, potassium nitrate, sodium chloride, and sodium nitrate are obtained sequentially by fractional crystallization.
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申请公布号 |
US5846501(A) |
申请公布日期 |
1998.12.08 |
申请号 |
US19970840239 |
申请日期 |
1997.04.11 |
申请人 |
DURFERRIT GMBH THERMOTECHNIK |
发明人 |
KREMER, MATTHIAS;WAHL, GEORG;GOCK, EBERHARD;WIGGER, STEFAN;KAEHLER, JOERG |
分类号 |
C01D3/06;C01D3/08;C01D9/00;C01D9/04;C01F11/18;C21D1/18;C21D1/46;C21D1/607;(IPC1-7):C22B26/20;C22B26/10 |
主分类号 |
C01D3/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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