Method for producing recycled salt for glass chemistry strengthening and method for producing chemically strengthened glass

摘要

PROBLEM TO BE SOLVED: To provide a production method of regeneration salt for glass chemical reinforcement and a production method of chemical reinforcement glass which can suppress waste of deteriorated salt and increase of waste water cost and are excellent in handling ability.SOLUTION: Provided is the production method of regeneration salt for glass chemical reinforcement comprising: a solution step for solving the salt which was subjected to treatment of glass chemical reinforcement to water; and a deposition step for cooling the water solution obtained in the solution step to deposit the regeneration salt, in which, the whole period of the deposition step, the water solution is cooled at cooling speed which does not exceed 8.5°C/h.