Flowchart-extraction of sulphur

EXTRACTION OF SULPHUR
BY
FRASCH PROCESS

The following is the description of the process of extraction of sulphur by Frasch process.
First, an area containing sulphur beds is identified. Next, with the help of drilling tools, three concentric pipes are inserted into the sulphur bed. Then, water is heated to form superheated steam at 170 degree Celcius. Superheated water is then allowed to enter the outermost pipe. Sulphur in the beds is thus melted. Then, compressed air at 20- 30 atmospheres is forced into the innermost pipe. Due to this compressed air, molten sulphur is pushed upwards through the middle pipe. Next, molten sulphur is collected and stored in tanks. This sulphur is dried, cooled to obtain 99.9% pure sulphur.