The wastewater treated in this pilot test is the high-salt and high-CODcr refractory wastewater produced in the first workshop of Jiangxi Copper Industry Guixi Smelter. The main types of wastewater include excess silver precipitation (30m3/d), silver reduction solution (50m3/d), Separate copper immersion silver waste liquid (80m3/d) and replacement tellurium waste liquid (50m3/d). Among them, the excess silver immersion liquid (30m3/d) and the silver reduction liquid (50m3/d) are difficult to handle with high salinity. Wastewater has a high CODcr, which is difficult to treat and cannot be treated separately.

      In terms of evaporator, for high-salt, high-CODcr and difficult-to-treat wastewater, a high-efficiency heat pump vacuum low-temperature evaporator designed and imported from Italy is adopted. The high-efficiency heat pump type vacuum low-temperature evaporator integrates heat pump technology and vacuum technology. The integrated design gives the evaporator an evaporation temperature of 35-60℃, providing waste liquid reduction (10-15% concentrated liquid) and zero discharge (crystallization). While adding value-added services, it also reduces disposal costs. In addition, the evaporator adopts modular component integration, which is easy to install and maintain. The integrated design makes it have a small footprint.

      After a month of hard work by two colleagues in the environmental protection R&D department of Winning, they passed a series of pilot experiments, and finally the removal rate of wastewater CODcr reached more than 90%, which exceeded the requirements of the owner, passed the owner’s review and received consistent Praise.