Method for preparing nanometer ultra-fine tourmaline powder

Abstract

The present invention relates to production of non-metal mineral powder, and is especially the preparation process of nano superfine tourmaline powder. The technological process includes the steps of: coarse crushing ore, airflow crushing, post-treatment, wet ball milling, spray drying, eliminating agglomeration of powder, and packing. The main technological prameters include calcining temperature of initially crushed powder in air of 300-800 deg.c, calcining time of 2-4 hr to obtain tourmaline powder in different colors, and ball milling period of 36-72 hr. Compared with available technology, the present invention has obviously reduced agglomeration of tourmaline powder, raised crushing efficiency, powder size reduced to 15-60 nm, obviously raised negative ion generating capacity, various color of the powder and wide application range.

Description

technical field [0001] The invention belongs to the field of preparation of ultrafine non-metallic mineral powder, in particular to a preparation method of nanoscale ultrafine tourmaline powder. Background technique [0002] In real life, the amount of negative oxygen ions in the air has become the standard for whether the air is fresh or not. The World Health Organization (WHO) stipulates that the standard concentration of negative ions in fresh air should not be less than 1000 to 1500 per cubic centimeter of air. The measurement of the bacteria content in the air at 7 sampling points in Dinghushan found that all of them were zero. The main reason for the absence of bacteria is that the negative oxygen ions in the air have strong bactericidal power. However, the content of air negative ions in the cities, offices, hotels, hospitals, etc. where the population is relatively concentrated is very small (generally 100 / cm 3 Below), the air appears to be very cloudy. With the im...

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Problems solved by technology

[0003] In the early 1990s, negative ion generators appeared on the market. This kind of negative ion generator mainly uses high-voltage discharge to generate negative ions, accompanied by harmful substances such as ozone and nitrogen oxides, so it quickly faded out of the market.

From the related patents of present application, the overwhelming majority is the composite application of tourmaline powder (as CN 1307077A, open date 2001.8.8; CN 1089326C, open date 2002.8.21; CN 1242943A, open date 2000.2.2; 1222494A public date 1999.7.14 etc.), seldom relate to tourmaline powder ultramicromachining technique, post-treatment etc., and used powder particle size is also larger; What have has related to powder processing technology, as CN 1287888A (public date 2001.3.21), CN 1425503A (disclosure date 2003.6.25) has described a kind of preparation method of tourmaline micropowder, has related to the ultrafine processing technique of powder, but its technique is complicated, and the color produced is single (black), affects The scope of use and subsequent processing, such as textile dyeing, etc., the particle size produced is also too large, which is not conducive to the application of powder in textiles, cosmetics, etc.

However, in order to improve the performance of the powder, some invention patents have added rare earths, photocatalytic materials, etc., and the prepared composite powder has a relatively large safety hazard.

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