Preparation of soluble anhydrite product from natural calcium sulfate, involves use of single heating step without any subsequent forced cooling

摘要

A single heating step is followed by grinding so that the particles are cooled naturally without any forced cooling step being present. A method for preparing a product comprising soluble anhydrite III and poorly soluble anhydrite III from natural calcium sulfate or sub-products thereof uses a single heating step without any subsequent forced cooling since the grinding of the product results in the particles cooling naturally. A fluidizing agent present in the mixture helps provide compression resistance values of 20 MPa after 5 h, 45 MPa after 24 h and more than 80 MPa after 28 days.