Crude salt refining method and system

The invention discloses a crude salt refining method and system. The method comprises the following steps: preparing crude salt slurry; removing insoluble impurities to obtain a carnallite clear solution A containing SO4 < 2->, Ca < 2 + > and Mg < 2 + >; adding CaSO4 crystal seeds into the carnallite clear liquid A, and adding CaCl2 to obtain CaSO4 crystals and carnallite clear liquid B rich in Ca < 2 + > and Mg < 2 + >; adding Mg (OH) 2 seed crystals and Ca (OH) 2 to obtain Mg (OH) 2 crystals and calcium-containing clear liquid C; and adding a CaCO3 seed crystal, and adding NaCO3 to obtain a CaCO3 crystal and refined NaCl brine. The technical bottleneck that the sedimentation rate is too low when magnesium hydroxide flocs are separated independently can be broken through, and the crude salt refining process and the magnesium element recycling process are synchronously carried out. 本发明公开了一种原盐精制方法及系统，所述方法包括以下步骤：制备获得原盐浆液；去除不溶性杂质，获得含有SO42-、Ca2+和Mg2+的杂盐清液A；向所述杂盐清液A中投加CaSO4晶种，投加CaCl2，获得CaSO4晶体和富含Ca2+、Mg2+的杂盐清液B；投加