Co-treatment comprehensive recovery method for arsenic-containing benzyl alcohol waste liquid and arsenic-containing waste hydrochloric acid

The invention discloses a co-treatment comprehensive recovery method of arsenic-containing benzyl alcohol waste liquid and arsenic-containing waste acid, which comprises the following steps: mixing the arsenic-containing benzyl alcohol waste liquid with an aluminum-based catalyst, slowly adding arsenic-containing waste hydrochloric acid, carrying out heat preservation reaction for 5-6 hours, cooling to room temperature, filtering, and separating liquid to obtain a crude benzyl chloride organic phase and a water phase; distilling the crude benzyl chloride organic phase to obtain benzyl chloride of which the content is greater than 99%; slowly adding benzyl chloride into the sodium arsenite solution, reacting for 6-8 hours, cooling, and separating liquid to obtain a benzyl sodium arsonic acid water phase; and acidifying the sodium benzyl arsonic acid water phase by using arsenic-containing waste hydrochloric acid, and filtering to obtain a benzyl arsonic acid product. The method disclosed by the invention is si