Effects of salt crystallization of Na_2SO_4 and NaCl on concrete exposed to drying-wetting cycles were investigated by using index including concrete scaling amount,concrete expansion rate and strength loss rate,and chemical attack of concrete soaked in Na_2SO_4 and NaCl solutions was also measured.

The physical deterioration mechanism,characteristics salt,experimental methods,appraisable index and main influencing factors of soluble salt crystallization corrosion to concrete reviewed.

To avoid harm of sodium carbonate accumulating in circle mother liquor on alumina production,the effection of Na2OK concentration in mother liquor and removal salt temperature by crystallization on sodium carbonate solubility in evaporation mother liquor has been experimented.

In order to improve the crystallization rate of KNO_3,the new process for the production of KNO_3 by salting-out crystallization method is studied e.

,the reasons for the occurrence of too much crystal salt were analysed,and the method of determining tank-washing period was proposed.

Study on the treatment of waste sulphuric acid in steel works by single-pipe filling rising film condensability and crystal desalination;

Presented process procedure of process condensate stripping system of CO shift plant,analyzed reasons for ammonium salt crystallization in shift stripping condenser,and put forward technical revamp measures to prevent ammonium salt crystallization,and summarized the revamping effects.