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, SiO.sub.2 or Al.sub. 2 O.sub.3. 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.