Method for preparing high-purity potassium fluoride and coproducing nano silicon dioxide by utilizing micro-liquid membrane reaction device

Abstract

The invention discloses a method for preparing high-purity potassium fluoride and coproducing nano silicon dioxide by using a micro-liquid membrane reaction device. The method comprises the following steps: (I) preparing a reaction solution; (2) alkaline hydrolysis reaction; (3) drying treatment; (IV) roasting treatment and the like. The potassium fluosilicate turbid liquid and the alkali reaction liquid are synchronously injected into the micro-liquid membrane reaction device for reinforced mixing and reaction, and compared with a kettle type reaction device and a related process used in an existing enterprise, the method has the advantages that the operation is simple, the alkaline hydrolysis efficiency is high, and batch stable production is easy; an important way is provided for preparing potassium fluoride and nano silicon dioxide through high-value utilization of potassium fluosilicate.

Description

Preparation of high-purity potassium fluoride co-production of nano-silica using micro-liquid membrane reaction device method technical field The invention belongs to potassium fluoride and silicon dioxide preparation field, be specifically related to a kind of utilizing micro-liquid membrane reaction device to prepare A method for co-producing nano-silicon dioxide with high-purity potassium fluoride. Background technique Potassium fluoride is a kind of important fluoride salt product, value-added is high, and has a wide range of uses, especially fluorination in fine chemical industry Potassium is used as a fluorinating agent for organic reactions, and has the advantages of high reactivity and less by-products. Potassium fluoride is also an important catalyst. It is also the main raw material for the preparation of potassium hydrogen fluoride, which can be used as an electrical Electrolyte for decomposing fluorine. The common preparation method of potassium fluor...

AI Technical Summary

Problems solved by technology

However, the reaction between potassium fluorosilicate and potassium hydroxide is a slow reaction, and agglomeration is easy to occur in the process of alkaline hydrolysis. When it is carried out in a traditional tank reactor, the concentration and mass distribution in the reaction space are likely to be caused due to the large reaction space. Inhomogeneous, insufficient mixing and reaction, the amorphous silica generated during the reaction is easy to cover the surface of potassium fluorosilicate, reducing the alkali hydrolysis efficiency of potassium fluorosilicate, high silicon content in potassium fluoride, white by-product Problems such as high fluorine content, low purity and irregular shape of carbon black

Images