Study on the Amelioration Measures for the Caking Phenomenon of Phosphate Dry Coated Sand
Caking phenomenon is one of the problems encountered in the preservation of phosphate dry coated sand.It is difficult to keep the coated sand in the state of loose sand,which seriously affects the fluidity of the coated sand and the application of inorganic coated sand.In this paper,the caking problem was ameliorated by adding coupling agent and silica-gel drier to dry coated sand.The results showed that the two kinds of dry coated sand before and after coupling agent treatment were mixed uniformly with a mass ratio of 1∶1,and then added the silica-gel drier with a mass fraction of 1/200,which could effectively ameliorate the caking problem,the caking rate decreased about 65％,and the tensile strength of the sample obtained by sand-shooting was more than 1.5 Mpa.
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