The invention belongs to the technical field of
coal tar impurity removal, and relates to a
coal tar impurity removal method and
system.The method comprises the steps that water in
coal tar to be treated is evenly mixed with
coal tar components; heating the uniformly mixed
coal tar to a first temperature to obtain heated
coal tar; mixing the first group of liquid
medicine with the heated coal tar at a first temperature to obtain a first liquid
medicine and coal tar mixture, carrying out
evaporation precipitation treatment on the first liquid
medicine and coal tar mixture to obtain first purified coal tar, and mixing the second group of liquid medicine with the first purified coal tar to obtain a second liquid medicine and coal tar mixture; heating the second liquid coal tar mixture to a second temperature, reacting to obtain a coal tar mixture with
ion coagulation impurities, and dehydrating to obtain a dehydrated coal tar mixture with
ion coagulation impurities; and carrying out vacuum light
hydrocarbon removal on the dehydrated coal tar mixture with the
ion coagulation impurities, and then carrying out two-stage
filtration to obtain pure coal tar without impurities. According to the technical scheme provided by the invention, impurities in the coal tar can be effectively removed.