Abstract
The present work is a part of papers comprising the research on complex utilization of waste - apatite phosphogypsum (PG) obtained during the production of wet phosphoric acid from Kola apatite, on rare earth concentrate and anhydrite with simultaneous recovery of phosphate compounds. The way of PG utilization into anhydrite II was divided into two stages: 1. 1. Recovery of rare earth elements from PG by leaching in 12 wt pct sulphuric acid solution, 2. 2. Conversion of PG after leaching into anhydrite II in 50 wt pct sulphuric acid solution, 3. 2. Conversion of PG after leaching into anhydrite II in 50 wt pct sulphuric acid solution. The physical properties of the obtained anhydrite II as effect of potassium sulphate on the setting time and mechanical properties of anhydrite cement have been determined. Compressive strengths of 40 MPa and more have been achieved after 28 days, when 1.0 to 1.5 wt pct of K 2SO 4 had been added as accelerator. The research confirmed that the hardening process of discussed cement is connected with the formation of syngenite.
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