METHOD OF PRODUCING GYPSUM BINDER Russian patent published in 2011 - IPC C04B11/26 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing gypsum binder from hydrogen fluoride production wastes and can be used in processing acidic fluoroanhydrite wastes from production of hydrofluoric acid into binder. Uncooled acidic wastes from production of hydrofluoric acid are mixed with fluorogypsum - waste of producing hydrofluoric acid from a slurry pit. The mixture is simultaneously ground up and neutralised with a lime-containing agent. Fluorogypsum is added with moisture of 20.0-40.0 wt % in amount of 20.0-25.0 wt %. A setting accelerator, a superplasticiser and tartaric acid are further added to the mixture while grinding in the following ratio of components as percentage of the weight of the initial fluoroanhydrite: lime-containing agent - in amount required on stoichiometric ratio or not more than 5.0 wt % stoichiometric; setting accelerator 0.4-0.5; superplasticiser 0.2-0.3; tartaric acid 0.03-0.05.

EFFECT: high ultimate compression strength of the binder for making high-strength repair and reinforcing mixtures.

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