Preparation method of superfine dolomite and application of superfine dolomite

Abstract

The invention discloses a preparation method of superfine dolomite and application of the superfine dolomite, and relates to the technical field of dolomite processing. The preparation method comprises the steps: crushing dolomite, and screening to obtain dolomite coarse powder; adding the dolomite coarse powder and a grinding aid into water, and uniformly stirring to obtain dolomite slurry; adding the dolomite slurry into a stripping machine, and carrying out superfine stripping to obtain superfine slurry; dehydrating, drying and crushing the superfine slurry to obtain dolomite fine powder; adding the dolomite fine powder and a calcium hydroxide solution into a four-neck flask provided with a stirrer, then putting the four-neck flask into a constant-temperature water bath, and adding a crystal form control agent while stirring; and then introducing mixed gas of air and carbon dioxide into a three-neck flask for continuous stirring reaction, carrying out spray drying on the reaction liquid, forming powder, and thus obtaining the superfine dolomite. The problems that existing dolomite powder is large in particle size and small in application range, and superfine powder is prone to agglomeration and not prone to uniform dispersion are solved.

Description

technical field [0001] The invention relates to the technical field of dolomite processing, in particular to a method for preparing ultrafine dolomite and the application of ultrafine dolomite. Background technique [0002] Dolomite is a common white non-metallic mineral belonging to CaCO 3 and MgCO 3 The composite carbonate minerals in my country are extremely rich in reserves and are an important calcium and magnesium resource. Dolomite has been widely used as a filler in papermaking, coatings, plastics, rubber, adhesives and other industries. [0003] At present, ultra-fine dolomite has not been applied yet. The existing dolomite is generally tens to hundreds of mesh, and the finest is no more than 1000 mesh, so the application of dolomite is also limited. [0004] At present, the physical pulverization method has become the most widely used method for producing ultrafine powder materials due to its advantages of low cost, simple production process and large output. T...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a preparation method of ultrafine dolomite and the application of ultrafine dolomite: by pulverizing dolomite and sieving to obtain dolomite coarse powder, the dolomite coarse powder , adding grinding aid to water, stirring evenly to obtain dolomite slurry, adding the dolomite slurry to the peeling machine for ultra-fine peeling to obtain ultra-fine slurry, dehydrating, drying, and pulverizing the ultra-fine slurry to obtain dolomite Fine powder, add dolomite fine powder and calcium hydroxide solution into a four-necked flask equipped with a stirrer, then place the four-necked flask in a constant temperature water bath, add crystal form control agent while stirring, and then pass into the three-necked flask The mixed gas of air and carbon dioxide continues to stir and react. When the pH is equal to 7, the reaction is stopped, and the reaction solution is spray-dried to form a powder to obtain the ultrafine dolomite, which solves the problem of the large particle size of the existing dolomite powder. The range is small, and the ultrafine powder is easy to agglomerate and difficult to disperse evenly

Images