DOI 10.35776/VST.2022.05.07
UDC 691.215.1:691.5:628.544

Kamarou Maksim, Romanovskii Valentin

Production of synthetic gypsum from water treatment wastes, i. e., incompletely burned lime

Summary

Synthetic gypsum is a material that is produced in the process of sulfuric acid interacting with carbonate-containing materials. It is a promising analogue of natural gypsum for those countries that do not have deposits of natural gypsum stone. Synthetic gypsum produced on the basis of incompletely burned lime, can be attributed to the first grade of gypsum; however, there are significant differences from natural gypsum confirmed by the results of differential thermal analysis. The main peaks of the effects are shifted down by 30–50°C owing to the higher reactivity of the synthesized material. In the production of synthetic gypsum, a by-product is generated, i. e., a filtrate that contains salts (sulfates) of sodium, potassium, magnesium, which opens up the possibility of using it as a complex micro fertilizer.

Key words

water treatment , incompletely burned lime , synthetic gypsum , micro fertilizer