Integrated system of comprehensive utilizing the Integrated system of comprehensive utilizing the concentrated brine of Yuncheng salt-lake basing on salt-forming diagram

摘要

The comprehensive utilization and environment-friendliness of processes for recovering fresh water or valuable salt from seawater,salt-lakes,or mineral deposits are of utmost importance for sustainable development.One primitive sustainable process for recovering salt from sodium-sulfate-type brine in Yuncheng salt lake had been considered one of the greatest inventions of ancient China,however,the replaced process of mass extraction of single Na2SO4 in recent years,has reduced a large amount of residual brine,In this research,relying on the salt-forming diagram in the non-equilibrium state,the technical secrets of ancient salt processes were uncovered,and a new comprehensive utilization system was proposed and tested experimentally.The new system includes a vacuum salt-making process and a normal pressure kieserite process,which can gradually eliminate the existed waste liquid and aid in the sustainable development of the Yuncheng salt-lake.The continuous experiment of salt-making process running stably in the double salt region without double salt formation,which proves the feasibility of salt-forming diagram applied in industrial process.Thus salt-forming diagram would be extremely valuable to industry process design and control,especially,the treatment of concentrated brine.