发明名称 |
Sulfuric acid waste recycling by regenerative process |
摘要 |
The process will recover sulfuric acid on the 90-95% concentration range by roasting of ferrous sulfate hydrate crystals at high temperature under retort conditions. In the first step of the recovery process 6 (see FIG. 1) hydroxide slurry is reacted with the waste stream, and ferrous sulfate crystals obtained. In the second step 9 iron sulfate crystals are roasted and water of hydration reacts with sulfate and sulfur trioxide to produce sulfuric acid in a retort operation. The sulfuric acid and sulfur trioxide are condensed or absorbed in water or dilute sulfuric acid and are of a high purity, leaving iron oxide as a recovered carrier. In the third step, this iron oxide/hydroxide is reduced 13 and used to produce a slurry, which is pumped back to react with the entering sulfuric acid waste stream. The process has the following advantages: continuous operation non-exotic and inexpensive chemicals are used high purity sulfuric acid is recovered can operate at large and small production levels low maximum temperature for sulfuric acid recovery (750 degrees C.).
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申请公布号 |
US5730950(A) |
申请公布日期 |
1998.03.24 |
申请号 |
US19960670373 |
申请日期 |
1996.06.25 |
申请人 |
KLOTZ, JENNIFER L.;KLOTZ, LAURIE J. |
发明人 |
KLOTZ, WILLIAM L. |
分类号 |
C01B17/50;(IPC1-7):C01B17/90;C01B17/69 |
主分类号 |
C01B17/50 |
代理机构 |
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代理人 |
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主权项 |
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