Reasons for the deposit of saline alkaline crystal in the hydrogen channel inside cathode chamber and its elimination;

s:Based on the principles, theories and technical routines of noncooling process and crystallization as a control process, simulated tests are conducted on crystallization of sodium bicarbonate in the mother liquor by Hou's Process and AmmoniumSoda Process in a 164×3620 circumfluent carbonizing tower.

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.

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.

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