Synthesis method of tourmaline

A synthesis method and tourmaline technology, applied in silicate, aluminum silicate and other directions, can solve the problems of high equipment requirements, high preparation cost, wide product particle size distribution, etc., and achieve easy operation, mild conditions, and equipment. simple effect

Inactive Publication Date: 2010-02-24
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many studies on natural tourmaline mineral mining and its performance at home and abroad, but there are few reports on artificial synthesis of tourmaline
The currently used tourmaline is mostly prepared by mineral purification, crushing, grinding and surface modification to prepare tourmaline ore into micron-scale or nano-scale powder. The fine process brings difficulties, and the particle size distribution of the product is wide
The method of chemical synthesis is beneficial to obtain uniform nano-powder. The most researched is the synthesis of tourmaline by hydrothermal method. The raw materials (mostly mixed oxides) are placed in a hydrothermal kettle at a temperature of 300-700°C. The pressure is more than several hundred MPa and it takes several days to react to obtain a mixture of tourmaline and other compounds; however, the method requires high equipment requirements, and the process operation requires high pressure conditions in addition to temperature conditions, and the preparation cost is relatively high. defect

Method used

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  • Synthesis method of tourmaline

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Weighing of reactants and preparation of solutions. Weigh magnesium chloride (MgCl 2 ·6H 2 O), aluminum chloride (AlCl 3 ), sodium silicate (Na 2 SiO 3 9H 2 O), boric acid (H 3 BO 3 ). H 3 BO 3 and Na 2 SiO 3 9H 2 O was dissolved in deionized water to form solution (a), AlCl 3 and MgCl 2 ·6H 2 O was dissolved in 1mol / L HCl solution to prepare solution (b). Prepared solutions (a) and (b) were heated and stirred on a constant temperature magnetic stirrer, and kept at a constant temperature of 60°C, then slowly added solution (a) dropwise to solution (b) under constant temperature stirring, and kept stirring at a constant temperature for 10 minutes, A homogeneous solution (c) is obtained.

[0025] (2) dropwise reaction. Use a basic burette to slowly add 3mol / L sodium hydroxide solution dropwise to the solution (c) kept at a constant temperature, and at the same time use a PHS-3C precision pH meter to detect the pH value online, and record the change o...

Embodiment 2

[0032] (1) According to the ratio of n(Mg):n(Al):n(Si):n(B)=1:2:2:1, weigh MgCl respectively 2 ·6H 2 O, AlCl 3 、Na 2 SiO 3 9H 2 O and H 3 BO 3 (unit: gram); then the H 3 BO 3 and Na 2 SiO 3 9H 2 O was dissolved in 250ml deionized water to form solution a, and the weighed AlCl 3 and MgCl 2 ·6H 2 O was dissolved in 1mol / L 250ml HCl solution to make solution b; under the condition of 60±1℃, heat and stir solution a and solution b separately, then add solution a dropwise into solution b, and Stir at constant temperature for 10-15 minutes to obtain a homogeneous solution c, in which the amount of magnesium ions is 0.01-0.04 g / ml;

[0033](2) Use a basic burette to drop a sodium hydroxide solution with a concentration of 5mol / L and a temperature of 60±1°C into the phase solution c, and check the pH value at the same time until the pH value is 9.5, and the solution produces white color. Stop the dropwise addition of flocculent precipitate and continue to stir for 1h; ...

Embodiment 3

[0038] (1) According to the ratio of n(Mg):n(Al):n(Si):n(B)=1:2:2:1, weigh MgCl respectively 2 ·6H 2 O, AlCl 3 、Na 2 SiO 3 9H 2 O and H 3 BO 3 ; Then the weighed H 3 BO 3 and Na 2 SiO 3 9H 2 O was dissolved in deionized water to form solution a, and the weighed AlCl 3 and MgCl 2 ·6H 2 O was dissolved in 1mol / L HCl solution to form solution b; solution a and solution b were heated and stirred at a constant temperature at 65°C, and then solution a was added dropwise to solution b, and stirred at a constant temperature of 60°C for 15 minutes. Obtain homogeneous solution c, wherein the amount of magnesium ions is 0.01-0.04g / ml;

[0039] (2) Use a basic burette to drop a sodium hydroxide solution with a concentration of 1mol / L and a temperature of 65°C into the phase solution c, and check the pH value at the same time until the pH value is 9, and white flocculents are produced in the solution Stop dropping the precipitate and continue to stir for 2h;

[0040] (3) Le...

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Abstract

The invention discloses a synthesis method of tourmaline. The method comprises the following steps: preparing a homogeneous solution with sodium, magnesium, aluminum, silicon, boron and other elementsat constant temperature, then adding precipitant sodium hydroxide to ensure the solution to reach a certain pH value, obtaining precipitate slurry, and then performing subsequent cleaning, filtrating, drying and calcining processes to prepare tourmaline powder. The method of the invention can be used to obtain the powder containing tourmaline directly, the conditions of the whole preparation method are mild, the method is easy to realize and the cost is low. The precipitate product can be dispersed and calcined to obtain nanometer tourmaline powder which can be conveniently used in fields such as medical treatment and health care, environmental protection, construction and the like.

Description

technical field [0001] The invention relates to a method for synthesizing tourmaline, in particular to a method for synthesizing tourmaline phases by an atmospheric pressure precipitation method. Background technique [0002] Tourmaline is a ring-shaped silicate mineral with complex composition, characterized by boron, and has piezoelectric effect, pyroelectric effect and spontaneous polarization effect, because it can emit infrared rays, release negative ions, and generate bioelectrical currents, etc. , and has a wide range of uses and good development prospects in fields such as medical care, environmental protection, and building materials. [0003] In the prior art, the tourmaline powder obtained from the tourmaline ore through a mechanical method is mostly used in combination with other substances. Such as the Chinese invention patent (the publication number is CN1800014A, and the publication date is 2006.07.12) "artificially synthesized tourmaline crystal and its prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 吕宇鹏许文花李士同
Owner SHANDONG UNIV
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