Patent ID: 9528361
Filing Date: 2016-12-27
CPC Classification: C01D,E21B

Claim Text:
1. A process for recovering soda values from a first soda deposit and a second soda deposit situated respectively in a first underground cavity and a second underground cavity containing respectively a first soda solution and a second soda solution, the second soda solution containing a higher concentration in sodium chloride, in sodium sulfate, or in sodium chloride and in sodium sulfate, than the first soda solution, the process comprising: extracting a stream of said first soda solution from the first underground cavity; introducing the stream of said first soda solution in a first process which produces, out of the first soda solution, first soda crystals and a first waste purge stream containing a higher concentration in sodium chloride, in sodium sulfate, or in sodium chloride and in sodium sulfate, than the first soda solution; introducing at least a part of the first waste purge stream in the second underground cavity; extracting a stream of said second soda solution from the second underground cavity; and introducing the stream of said second soda solution in a second process which produces, out of the second soda solution, second soda crystals which have a higher concentration in sodium chloride, in sodium sulfate, or in sodium chloride and in sodium sulfate, than the first soda crystals.