Alkali metal silicate, alkali transition metal silicate, and method for synthesizing silicate

摘要

A method for synthesizing alkali metal silicate which can be easily microparticulated, a method for synthesizing, with the use of the alkali metal silicate, alkali transition metal silicate, and alkali metal silicate and alkali transition metal silicate which are synthesized by the synthesis methods are disclosed. The alkali metal silicate is synthesized by the following steps: forming a basic solution including an alkali metal salt; mixing the basic solution including the alkali metal salt with silicon particles to form a basic solution including the alkali metal silicate; and adding the basic solution including the alkali metal silicate to a poor solvent for the alkali metal silicate to precipitate the alkali metal silicate. Further, the alkali metal silicate is mixed with a microparticulated compound including a transition metal to form a mixture, and the mixture is subjected to heat treatment, whereby the alkali transition metal silicate is generated.

主权项

1. A method for synthesizing a silicate microparticle, comprising the steps of:
adding dropwise of a first solution including alkali metal silicate to a second solution to precipitate the alkali metal silicate under stirring the second solution or under application of ultrasonic waves to the second solution, wherein a solubility of the alkali metal silicate of the second solution is lower than a solubility of the alkali metal silicate of the first solution, wherein a silicon atoms molar concentration of the first solution is higher than or equal to 0.1 mol/l and lower than or equal to 0.5 mol/l, wherein a rate at which the dropwise of the first solution is added to the second solution is higher than or equal to 40 ml/h and lower than or equal to 80 ml/h, and wherein a solvent of the second solution has affinity for a solvent of the first solution.