Method for whitening tourmaline powder by using hydrothermal method
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A technology of tourmaline powder and hydrothermal method, applied in aluminum silicate, silicate and other directions, can solve the problems of low whiteness and dark color, and achieve the effect of improving quality and service life
Inactive Publication Date: 2014-05-21
厦门山俊水杰科技有限公司
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[0004] The purpose of the present invention is mainly to provide a kind of under the premise of not destroying the crystalline structure of tourmaline, adopt hydrothermal method to make the iron ion dissolution in tourmaline reach the improve
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[0020] Example 1
[0021] (1) First crush the tourmaline to a particle size of 5-45μm;
[0022] (2) Then mix the crushed tourmaline powder with hydrochloric acid with a mass concentration of 18-36%, and the mass ratio of tourmaline powder to hydrochloric acid is 1:2;
[0023] (3) Then it is heated in a closed acid-resistant reactor with an acid-resistant alloy liner, the heating temperature is 650℃, and the reaction time is 12h;
[0024] (4) After the reaction is over, the reactants are taken out of the reactor, washed and dried to obtain a finished product with a whiteness of 55.
Example Embodiment
[0025] Example 2
[0026] (1) First crush the tourmaline to a particle size of 1-5μm;
[0027] (2) Then mix the crushed tourmaline powder with hydrochloric acid with a mass concentration of 18-36%, and the mass ratio of tourmaline powder to hydrochloric acid is 1:5;
[0028] (3) Then it is heated in a closed acid-resistant reactor with an enamel liner, the heating temperature is 200℃, and the reaction time is 48h;
[0029] (4) After the reaction, the reactants are taken out from the reactor, washed and dried to obtain a finished product with a whiteness of 50-60.
Example Embodiment
[0030] Example 3
[0031] (1) First crush the tourmaline to a particle size of 600-1000nm;
[0032] (2) Then mix the crushed tourmaline powder with hydrochloric acid with a mass concentration of 18-36%, and the mass ratio of tourmaline powder to hydrochloric acid is 1:3;
[0033] (3) Then it is heated in a closed acid-resistant reactor with an enamel liner, the heating temperature is 400℃, and the reaction time is 30h;
[0034] (4) After the reaction, the reactants are taken out from the reaction kettle, washed and dried to obtain a finished product with a whiteness of 50-65.
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Abstract
The invention discloses a method for whitening tourmaline powder by using a hydrothermal method. The method comprises the following specific steps: (1) firstly, crushing tourmaline into powder with a particle size of 300nm-45 mu m; (2) then, mixing the crushed tourmaline powder with hydrochloric acid with a mass concentration of 18-36%; (3) placing into various closed acidproof reaction kettles to heat at a temperature of 120-650 DEG C, and reacting 2-48 h; (4) after the reaction is completed, taking a reactant out of the reaction kettle, and washing and drying the reactant so as to obtain a finished product. According to the method for whitening tourmaline powder by using the hydrothermal method disclosed by the invention, the structure of tourmaline is not changed, other white powder is not added, and the whiteness of whitened tourmaline can reach 45-65. Tourmaline treated by using the method disclosed by the invention does not have a desorption problem caused by a packaging method, so that the quality and application chemical stability of products are greatly improved.
Description
technical field [0001] The invention relates to the technical field of chemical industry, in particular to a hydrothermal whitening method for tourmaline powder. Background technique [0002] Tourmaline is a black silicate mineral with boron-containing aluminum, sodium, and lithium ring structures. Tourmaline has piezoelectric and pyroelectric effects. Under the conditions of temperature and pressure changes, It can cause the potential difference of the tourmaline crystal and make the surrounding air generate negative oxygen ions. The negative oxygen ions produced can degrade harmful substances such as formaldehyde and TVOCs in the air, thereby achieving the effect of purifying the air and contributing to human health. Tourmaline has the properties of various mineral functional materials due to its special structure. Such as spontaneous polarization, piezoelectricity, pyroelectricity, far-infrared radiation, and release of negative ions, and are widely used in the fields o...
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