Method of producing nano-calcium carbonate

Abstract

The invention discloses a method for preparing nanometer calcium carbonate, comprising the steps as follows: the raw material quicklime or Calcium Hydroxide is added in water to prepare suspending liquid of 8 to 12 percent, and mixed fully; while mixing, mixed carbon dioxide / air gas containing 28 to 30 percent carbon dioxide is fed to perform carbonization reaction, wherein, the gas feeding rate is 3 to 10 liter per minute, and the absorptivity constant of the carbon dioxide is controlled to 0.7 to 2.5 per second, the temperature in the whole carbonization process is 28 to 40 DEG C, and the reaction is stopped until the PH value of the suspending liquid declines to between 6.8 to 7.2; the suspending liquid is filtered and injected into two X-shaped channels which are ready, the calcium carbonate particulate is adjusted to a nanometer collider in diameter of 20 to 80 nanometer for splitting, emulsifying, dispersing, and synthesizing the nanometer calcium carbonate solution. The invention has the advantages of simple technique and method, good product quality, good stability, convenient operation and low cost, is applicable for the middle-sized and small-sized enterprisers involving in the industries including rubber, paint, plastic, printing ink, medicine, food, and health care product, etc.

Description

[0001] Field [0002] The invention relates to a method for preparing calcium carbonate, which belongs to the technical field of inorganic chemical industry, in particular to a method for preparing nano calcium carbonate using a nano collider. Background technique [0003] With the development of modern industrial technology, all walks of life have higher and higher requirements for calcium carbonate, and the demand is also increasing. As an important inorganic chemical product, calcium carbonate has the characteristics of simple production process and stable performance. It is widely used in industrial sectors such as rubber, plastics, paint, paper, ink, food, medicine, and feed. In the past, calcium carbonate was mainly used as a filler, and it only played the role of increasing and reducing costs. In recent years, due to the development of ultrafine calcium carbonate preparation technology and surface treatment technology, its application range has been further expanded. ...

AI Technical Summary

Problems solved by technology

The disadvantage of the conventional carbonization method is that the solubility of calcium hydroxide is very small, and the size of the bubbles containing carbon dioxide is often large. Since the carbonization reaction involves a gas-liquid-solid three-phase system, the calcium ions in the solution react with carbon dioxide on the surface of the bubbles. The raw calcium carbonate is solid, so the carbonization rate is usually relatively slow, the generated calcium carbonate particles have large particle size and uneven distribution, and the crystal form is difficult to control

[0007] Looking at these patents and methods, there are certain problems in the final products: the size of nanoparticles is uneven, it is not easy to control, many products are between nanometers and micrometers, and the distribution range of nanometer particle sizes is wide; some are even at the micron level.

[0008] However, due to factors such as high cost, harsh conditions, unstable performance, and the need for huge investment, the existing methods for preparing nano-calcium carbonate are difficult to promote on a large scale. reason for being turned away