Here, "waste salt, chemical" refers to a mixed inorganic salt by-product generated and discharged from various chemical production processes by reactions, side reactions or separation and purification steps, typically containing cations such as sodium and potassium as well as anionic constituents such as chloride, nitrate and sulfate. After such waste salt has lost its original product properties or is no longer reused in the original process, following collection and necessary treatment it can be sold externally as an industrial salt feedstock for use as a de-icing agent, chemical raw material or other resource recovery routes that comply with the relevant regulatory requirements.