Sasakura’s Technologies
The coagulation sedimentation method using slaked lime generates a large amount of sludge from highly concentrated hydrofluoric acid wastewater, increasing industrial waste.
In addition, wastewater processed with coagulation sedimentation still contains several tens of ppm of fluorine, which imposes a heavy load on wastewater treatment.
Sasakura has developed a practical system for recovering fluorine from such liquid waste as hydrofluoric acid at more than 10% by evaporative concentration.
【Unique System】
● Two-tower type concentrator
Hydrofluoric acid has the property of evaporating with water vapor, and if it is simply boiled down, most of the fluorine will evaporate away.
Two-tower type evaporating concentrators consist of a concentrator in the first tower and a water rinsing tower in the second, and the hydrofluoric acid recovered in the water rinsing tower in the second tower is fed back into the concentrator in the first tower.
This maximizes the recovery rate of hydrofluoric acid.
● Acid and alkali separation equipment
The vapor that passes through the second tower, the water rinsing tower, reaches the alkali scrubber where residual hydrofluoric acid in the vapor is removed by chemical reaction. The generated alkaline fluoride solution is again separated into hydrofluoric acid and alkali by acid and alkali separation equipment.
〈When using Model STC〉