Industrial potassium chloride purification process and production system

The invention discloses an industrial potassium chloride purification process and a production system, and the purification process comprises the following steps: mixing high-sodium potassium chloride with water to obtain potassium chloride crystal mush, adding a refining agent into the crystal mush, centrifuging to obtain 98% or more low-sodium potassium chloride for producing high-quality potassium hydroxide, conveying to a brine section as a production raw material, meanwhile, the formed precipitate can be used as a raw material of a compound slow-release fertilizer after forming salty mud in a salty water section along with crude salt. The centrifugal mother liquor is circularly washed for multiple times and then subjected to evaporation concentration and cold crystallization to obtain potassium chloride with relatively high purity, sodium chloride separated out by secondary evaporation and thermal crystallization of the mother liquor subjected to primary crystallization can be used as a raw material of a