Percolate concentrated solution evaporation and concentration method and system

The embodiment of the invention provides a percolate concentrated solution evaporation and concentration method and system. The percolate concentrated solution evaporation and concentration method comprises the steps: carrying out primary evaporation and concentration on feed liquid; filtering or precipitating the feed liquid subjected to primary evaporation and concentration to remove suspended matters and solid particles in the feed liquid; and carrying out secondary evaporation and concentration on the filtered or precipitated feed liquid. According to the percolate concentrated solution evaporation and concentration method provided by the invention, the evaporation process of the leachate concentrated solution is divided into two parts; the operation pressure of the equipment is reduced; filtration or precipitation is carried out after the first evaporation and concentration; the reduction of the heat transfer efficiency of equipment caused by inorganic scaling and blockage of organic slime attached to a heat exchanger in the evaporation process of the leachate concentrated solution and unability to function properly are effectively avoided; and the filtering or precipitating process is carried out at high temperature, so that heat loss is avoided, the cleaning period of the equipment is shortened, and meanwhile, the evaporation and concentration continuous efficiency is improved.