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A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-pro

A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until the fluorogypsum hardens, the hardened fluorogypsum having a pH of about 3 to about 5, including heating the hardened fluorogypsum to evaporate substantially all water physically mixed with the fluorogypsum and further heating the fluorogypsum to reduce the water chemically bound to calcium sulfate in the fluorogypsum to from about 0.5% to about 9% by weight.

대표청구항 ▼

A process for the preparation of a waste solidification material from hardened fluorogypsum having a pH of from about 3 to about 5 produced as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurryi

A process for the preparation of a waste solidification material from hardened fluorogypsum having a pH of from about 3 to about 5 produced as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product fluorogypsum with water and placing the slurry product in settlement ponds until the by-product fluorogypsum hardens, comprising: a. heating said hardened fluorogypsum having a pH of about 3 to about 5 for a time sufficient to evaporate substantially all water physically mixed with said hardened fluorogypsum, and b. further heating said hardened fluorogypsum at a temperature above 105°F. for a time sufficient to reduce water chemically bound to calcium sulfate in said hardened fluorogypsum to from about 0.5% to about 9% by weight.