Abstract: In order to solve the problems of construction difficulty and long construction period of water cooling wall of waste incinerator,the effects of different kinds of dispersant,retarder and flocculant on spraying performance of silicon carbide wet spraying product were studied.The experimental results show that: (1) When the addition of phosphate dispersant is 0.15% or the addition of polycarboxylic dispersant is 0.05%,between 60%~80%,the addition of dispersant is more suitable; (2) Spray paint with phosphate dispersant,when the addition of retarder is 0.015%,self\|flowing values of two hours remain at around 60%,which can meet the pumping time requirements.2# dispersant has a good retarding effect,the pumping time requirement can be satisfied without adding retarder; (3) Three kinds of flocculants used in this experiment all have flocculation effect on phosphate dispersant,the flocculation time varies due to the differences of acidity and alkalinity; However,the flocculation effect of 2# dispersant is not obvious.Above all,the spraying coating with 0.15% 1# dispersant and 0.015% retarder,when adding 0.2% flocculant A,it has appropriate pump time（more than 2 hours）,and the flocculation time (ti＝4 s),the retention plastic time (tm≈10 min) and the hardening time (ty≈3.7 h) can meet the spraying construction requirements.

Key words: Dispersant, Retarder, Flocculant, Wet spraying