The Research And Application Of Multifunctional Composite Additive For Cermics

Ball milling and drying process of raw materials are the one of main energyconsuming process in the production of ceramics, which consumes about 30% energyof the total energy in the full production of ceramics. In order to reduce the watercontent in ceramic slurry and to increase the efficiency of ball milling, it is necessaryto introduce some additives as water reducing agent and milling agent. On the otherhand, in order to obtain good plasticity and strength of green body, it is necessary toadding some strengthing and enplasticity agent. Therefore, it is very important todevelop a multi-functional ceramic additive with water reducing, milling improving,strengthing and enplasticity for reducing the energy consuption, improving technicperformance, lowing production cost and increasing efficiency.Based on the mechanisms analysis of water reducing, milling improving,strengthing and enplasticity of ceramic additives, the sully fluidity usually sued inbuilding ceramics was investigated in detail. A ceramic additive composed of trimericsodium phosphate, HL-2, sodium pyrophosphate and sodium oxalate in a ratio of 2: 2:1.5: 1 was developed, which has good efficiency for reducing water of buildingceramic slurry especially in the range of 0.6~0.65wt%.Furthermore, a multi-functional ceramic additive with water reducing, millingimproving, strengthing and enplasticity developed by introducingδ-sodiumdisilicate with layer crystal, which can join the cation in clay to form a multi-layerstructure. The multi-functional ceramic additive is composed of trimeric sodiumphosphate, HL-2 andδ-sodium disilicate in a ratio of 1.5: 1: 2:3. When adding0.50~0.7wt% of the multi-functional ceramic additive into building ceramic slurry,the efficiency of water reducing, milling helping and strengthing is best. When adding0.30~0.5wt% of the multi-functional ceramic additive into plastic ceramic slurry, theefficiency of enplasticity become evident, resulting in the reduction of the defult fromthe lack of plasticity.The results of applications of the multi-functional ceramic additive in buildingceramic plant and electrical porcelain factory show that it can reduce the ball millingtime, save the milling energy, reduce the water content of slurry, increase the strengthof green body, improve the quality of product. The multi-functional ceramic additivehas evident economic and environment efficiency in the application of ceramicproduction field.