Method for preparing nano active calcium carbonate

Abstract

The preparation method of nano active calcium carbonate is characterized by that it uses the carbide slag as raw material, which includes the following steps: adding water into calcium oxide obtained by cleaning carbide slag, digesting to obtain calcium hydroxide sturry liquor with a certain concentration, then introducing CO2 and at the same time adding additive to make carbonization reaction, and controlling a series of technological parameters to prepare nano calcium carbonate with a certain grain size, then adopting a certain surface treatment process to make the nano calcium carbonate undergo the process of organic surface modification and make it surface be oleophilic and have good dispersion property in oil phase.

Description

technical field [0001] The invention relates to a preparation method of nano-active calcium carbonate, which belongs to the technical field of chemical compound preparation and surface treatment. Background technique [0002] Calcium carbide is an important chemical raw material. It is mainly used in the production of acetylene gas, PVC, carbon black, etc. It is used in a large amount. In order to protect the environment and turn waste into treasure, it is particularly important to develop comprehensive utilization technology of carbide slag. [0003] Many documents have been announced to appear by utilizing carbide slag to make modified products, such as Chinese patent CN1058004A, CN1058005A proposes the method for utilizing carbide slag to prepare high-purity industrial calcium carbonate and high-purity industrial calcium oxide, but the added value of products produced by these methods is relatively low. Low, the economic benefit is not high. [0004] Nano-scale ultra-fi...

AI Technical Summary

Problems solved by technology

Propose in the Chinese patent CN1194944A, under the existence of dispersant ethanol etc., adopt the method for preparing the nano-calcium carbonate of particle diameter less than 50nm by reaction of sodium carbonate and calcium chloride, this method adopts raw material price higher

The Chinese patent CN1104179A proposes to prepare calcium carbonate by carbonization method, and directly surface-treat the calcium carbonate emulsion with higher fatty acid mixed with glyceride at a temperature of 35°C, but this patent does not involve the particle size control of nano-active calcium carbonate

The main steps of this method are to pass carbon dioxide into the calcium hydroxide suspension containing sugars, sodium glutamate and other additives to prepare calcium carbonate particles with an average particle size of 0.4 μm, and to prepare calcium hydroxide at a ratio of 10-100g / 100gCaCO3 The solution is added to the calcium carbonate solution prepared in the previous step, and then additives such as polyacrylate are added and carbon dioxide is introduced to continue the reaction, but the particle size of the calcium carbonate prepared by this patented method does not reach the nanometer level