The impinging stream reaction precipitation and low temperature solid state reaction method of the preparation of nano Strontium Carbonate

The main purpose is the production of Strontium Carbonate color display glass, glass absorbs the preparation of Strontium Carbonate by X - ray, and to improve the refractive index of glass, so a large number of nano Strontium Carbonate powder used for color TV picture tube glass screen glass, computer screens, such as manufacturing, reduce X - ray radiation on the human body. Here are two methods for the preparation of nano Strontium Carbonate as following:

1. Impinging stream reaction precipitation method:

In the submerged circulative impinging stream reactor, using strontium nitrate and ammonium hydrogen carbonate as raw material, by the reaction, legal HISTEP pure nano Strontium Carbonate product precipitation.

The experimental study on the effect of concentration, temperature, feed rate, reaction time and other factors on the yield of the product, nano Strontium Carbonate prepared products were characterized by XRD, crystallization effect is good, high purity, was characterized by TEM, the morphology is spherical or nearly spherical, the average particle size in 25nm.

The method is simple, narrow particle size distribution, can be recycled materials and is easy for industrialized production.

2. Low temperature solid state reaction method:

In the condition of the whole reaction thermodynamics feasible, molecules involved in the solid state reaction can carry out long distance movement and the reactant sufficiently contact and react, molecular production, when the crystal nucleus appeared product molecules accumulated to a certain amount, the nucleation and growth to a certain size is independent crystal phase.

Scientists has based on low temperature solid state chemical reaction technology, with six water strontium chloride and sodium carbonate as raw material is mixed and ground under the action of a catalyst, the solid state reaction synthesis of nano Strontium Carbonate powder, the grinding time, temperature, precipitation and the effect of surfactant on the reaction. XRD and TEM characterization of product, that product is pure Strontium Carbonate, its size is 50-80nlTl, and the intensity distribution.

The method has the advantages of simple process, high conversion rate of uniform particle size, programmable, easy realization of industrial production, mainly reflects the process without the use of solvents, consistent with the concept of green chemistry.