The invention provides a treatment method of
sodium tetrachloroaluminate generated in a production process of methyl dichlorophosphine, wherein the treatment method comprises the steps: adding
sodium tetrachloroaluminate solid slag into a
sodium hydroxide solution, stirring for reaction to obtain mixed
slurry, filtering to obtain aluminum
hydroxide solid and first filtrate, washing and
drying the aluminum
hydroxide solid, and collecting second filtrate generated in the washing process;
roasting the aluminum hydroxide solid to obtain aluminum
oxide; concentrating the first filtrate and the second filtrate to obtain a concentrated solution, carrying out solid-liquid separation to obtain a first crude sodium
chloride product and a concentrated mother solution, removing
moisture in the concentrated mother solution, and
drying to obtain a second crude sodium
chloride product; combining the first crude sodium
chloride and the second crude sodium chloride and heating to remove impurities, and thus obtaining refined sodium chloride; and adding pure water into the refined sodium chloride to prepare a saturated
saline solution, adding
calcium chloride, filtering to obtain third filtrate, adding
sodium carbonate and
sodium hydroxide into the third filtrate, filtering to obtain a primary refined
saline solution, and performing resin treatment to obtain a secondary refined
saline solution.