发明名称 |
Method for the preparation of low-chloride plaster products from calcium-containing residues of flue-gas purification plants |
摘要 |
Disclosed herein is a method for producing plasters that contain chloride contents of less than 0.5% by weight from calcium-containing impure products or residues having a high chloride content (e.g., about 10% or higher based on the total product or residue weight). The method does not require the addition of fly ash, SiO2 or Al2O3. The method comprises temperature and water-mediated conversion of calcium chloride to calcium oxide in the calcium-containing product or residue using water, steam and/or substances that generate water to obtain calcium oxide and hydrochloric acid; and sulfating calcium components in the product or residue using oxygen and sulfur-containing, largely calcium-free substances. The product so obtained is an anhydride plaster which can optionally be hydrated.
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申请公布号 |
US5324501(A) |
申请公布日期 |
1994.06.28 |
申请号 |
US19920845731 |
申请日期 |
1992.03.02 |
申请人 |
A.I.R. LIPPEWERK RECYCLING GMBH |
发明人 |
KOEHNK, DIETHEL M.;BINGS, HUBERT |
分类号 |
C01F11/46;(IPC1-7):C01F11/46;C01B7/07;C01B11/26 |
主分类号 |
C01F11/46 |
代理机构 |
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主权项 |
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地址 |
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