Preparation method for nanometer tourmalinite powder

Abstract

The invention relates to a preparation method for nanometer tourmalinite powder. The preparation method comprises the following steps: (1) wet-process high-speed coarse grinding: with micron-order tourmalinite powder as a raw material, adding micron-order tourmalinite powder and water into a ball milling tank for coarse grinding so as to obtain coarsely-ground tourmalinite slurry, wherein a coarse grinding medium is zirconia grinding beads with particle sizes of 1 to 5 mm; (2) wet-process high-speed fine grinding: separating the coarsely-ground tourmalinite slurry prepared in the step (1) from the coarse grinding medium, the mixing the coarsely-ground tourmalinite slurry with a fine grinding medium, adding water for dilution and carrying out fine grinding in a ball milling tank so as to obtain nanometer tourmalinite slurry, wherein the fine grinding medium is zirconia grinding beads with particle sizes of 0.1 to 0.5 mm; and (3) freeze drying: adding the nanometer tourmalinite slurry obtained in the step (2) into a container, putting the container in a freezing dryer and carrying out drying under the conditions of a vacuum degree of 5 to 50 Pa and a temperature of -60 to -80 DEG C so as to obtain the nanometer tourmalinite powder.

Description

technical field [0001] The invention belongs to the field of preparation of non-metallic ore superfine powder, in particular to a preparation method of nanometer tourmaline powder. Background technique [0002] Tourmaline is the general name of tourmaline group minerals, and it is a natural silicate mineral with ring structure characterized by multi-element and boron content. The general structural formula of tourmaline is XY 3 Z 6 [Si 6 o 18 ][BO 3 ] 3 W 4 where X = Ca 2+ 、Na + 、K + , □ (vacancy), Y=Mg 2+ , Fe 2 + , Li + , Mn 2+ 、Al 3+ , Fe 3+ , Z=Al 3+ , V 3+ 、Cr 3+ , Mg 2+ , W=OH - , F - , O 2- . [0003] Tourmaline has piezoelectricity and pyroelectricity. Its piezoelectricity shows that when the temperature and pressure change, the potential difference of the tourmaline crystal will also change. The air around the tourmaline will be ionized, and it will adhere to the adjacent oxygen molecules. The hit electrons will become air negative ions. Ne...

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Problems solved by technology

The reaction time is long, although the dispersant is added in the hydrothermal reaction, the inorganic salt carried by the moisture inside the material migrates to the surface during the drying process, which precipitates on the surface and causes surface hardening, and the tourmaline will reunite

[0007] The method disclosed in patent CN106380897 uses raw ore as raw material, and the obtained tourmaline has a particle size of 100nm to 300nm, which is relatively large, and requires coarse crushing of raw ore, preliminary calcination, cooling, secondary calcination, microwave heating treatment, preliminary ball milling, Primary spray drying, tertiary calcination, secondary ball milling and secondary spray drying, the process is relatively complex, requires high processing conditions and requires a high temperature environment, and consumes a lot of energy

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