| 摘要 |
PURPOSE:To obtain fine-grained zinc silicate of high purity suitable for use as an additive for a nonlinear zinc oxide voltage resistor with high reproducibility by converting zinc ions into a specified zinc complex and reacting the complex with an aqueous soln. contg. silicate ions. CONSTITUTION:A ligand consisting of atoms such as C, H and N, e.g., ammonia or ethylenediamine is added to an aqueous soln. contg. zinc ions such as an aqueous soln. of zinc nitrate to convert all of the zinc ions in the soln. at 8- 12pH into a zinc complex which is not decomposed and does not cause precipitation, e.g., a zinc ammine complex. To the resulting soln. is added an aqueous soln. contg. silicate ions such as an aqueous soln. of sodium metasilicate, and they are stirred under heating to cause a reaction. A white precipitate produced by the reaction is separated by filtration, washed, and dried to obtain desired zinc silicate powder. This zinc silicate powder contains a small amount of trace impurity elements and has a small average particle size. |
