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Vermiculite synthesized by phlogopite hydrothermal reaction and preparation method thereof

A technology of hydrothermal reaction and phlogopite, which is applied in the direction of chemical instruments and methods, silicon compounds, non-metallic elements, etc., can solve the problems of incomplete reaction, complex process flow, long reaction time, etc., achieve uniform particle size and simplify process flow , the effect of improving efficiency

Active Publication Date: 2021-04-13
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Up to now, most of the methods for synthesizing vermiculite from phlogopite at home and abroad have complicated process flow, long reaction time, and incomplete reaction, which are easy to be accompanied by by-products.

Method used

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  • Vermiculite synthesized by phlogopite hydrothermal reaction and preparation method thereof
  • Vermiculite synthesized by phlogopite hydrothermal reaction and preparation method thereof
  • Vermiculite synthesized by phlogopite hydrothermal reaction and preparation method thereof

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Embodiment 1

[0024] figure 1 The process flow diagram of the method for synthesizing vermiculite by hydrothermal reaction of phlogopite of the present invention is shown.

[0025] Such as figure 1 Shown, in an exemplary embodiment of the present invention, the method for the synthetic vermiculite of phlogopite hydrothermal reaction comprises the following steps:

[0026] The phlogopite raw material is dried and crushed to obtain powder. For example, in the drying step, put the sample in an oven at 60°C for 1-2 days to remove interlayer water and make subsequent crushing easier. For example, the phlogopite raw material may be phlogopite ore, or other raw materials containing phlogopite and / or hydrophlogopite. For example, after the crushing step, a pulverizing step may also be included to allow the phlogopite to fully react. For example, the particle size of the powder may be 40 mesh to 400 mesh (eg, 200 mesh). Here, if it is lower than 40 mesh, the sheet diameter of phlogopite mica ra...

Embodiment 2

[0037] image 3 Shows the XRD pattern of vermiculite in another exemplary embodiment of the present invention; Figure 4A Shows the low-magnification SEM image of vermiculite after expansion in another exemplary embodiment of the present invention; Figure 4B A high magnification SEM image of expanded vermiculite in another exemplary embodiment of the present invention is shown.

[0038] In another exemplary embodiment of the present invention, the steps of synthesizing vermiculite by phlogopite hydrothermal reaction are as follows:

[0039] After the phlogopite raw material is dried and crushed, it is ground to 100 mesh.

[0040] Prepare a NaCl solution with a concentration of 1 mol / L, and adjust the pH of the solution to 4 with glacial acetic acid with a concentration greater than 99.5%. Mix 100-mesh phlogopite powder with NaCl solution at a mass ratio of 1:2.8, and put it into a polytetrafluoroethylene hydrothermal reactor liner. React at 190°C for 4 days, and when the re...

Embodiment 3

[0043] In another exemplary embodiment of the present invention, the steps of synthesizing vermiculite by phlogopite hydrothermal reaction are as follows:

[0044] After the phlogopite raw material is dried and crushed, it is ground to 300 mesh.

[0045] Configure MgCl with a concentration of 0.5mol / L 2 solution, and adjust the pH of the solution to 5 using glacial acetic acid with a concentration greater than 99.5%. Mix 300 mesh phlogopite powder with MgCl 2 The solution is mixed according to the mass ratio of 1:1.5, and put into the liner of the polytetrafluoroethylene hydrothermal reactor. React at 220°C for 5 days, and when the reaction time reaches 3 days, replace the solution in the reactor with MgCl with a concentration of 0.5mol / L 2 solution and continue the reaction.

[0046] After the reaction time reaches 5 days, the product synthesized by the hydrothermal reaction is filtered and washed several times until the pH of the last washing liquid is 8, and the vermicu...

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Abstract

The invention provides vermiculite synthesized by a phlogopite hydrothermal reaction and a preparation method thereof. The method comprises the following steps: drying and crushing a phlogopite raw material to obtain powder; adjusting the pH value of a halide salt solution to 6 or below by utilizing organic acid to obtain a reaction solution, the halide salt solution being a non-potassium halide halide metal salt solution, and the concentration of the halide salt solution being 0.5 to 3 mol / L; mixing the powder with the reaction solution according to a mass ratio of 1 or less, then carrying out a reaction at 180 to 300 DEG C, and updating the reaction solution in the reaction process; and after the reaction is finished, carrying out filtering and drying to obtain the vermiculite. The vermiculite synthesized by the hydrothermal reaction comprises the vermiculite prepared by the method. According to the method, the technological process is remarkably simplified, and the vermiculite synthesized through the hydrothermal reaction has the advantages of being uniform in particle, high in purity and excellent in expansion performance.

Description

technical field [0001] The invention relates to the field of development and utilization of non-metallic minerals and inorganic non-metallic materials, and more specifically relates to a vermiculite synthesized by hydrothermal reaction of phlogopite and a preparation method thereof. Background technique [0002] As a mineral group, "vermiculite" refers to a trioctahedral or dioctahedral aluminosilicate with a structure layer of 2:1 type and interlayer domains with water molecules and exchangeable cations. The unit chemical formula layer charge is 0.6-0.9 , the thickness of the unit crystal layer is The vermiculite referred to in the industry is a group of mica-like layered silicate minerals that can produce dramatic volume expansion when burned. It includes "vermiculite" in the mineralogical sense, and regular or irregular interlayer minerals formed by phlogopite, biotite and chlorite crystal layers and vermiculite crystal layers. Their common feature is that they all cont...

Claims

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Application Information

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IPC IPC(8): C01B33/42
CPCC01B33/42C01P2006/80C01P2002/72C01P2004/03
Inventor 孙红娟马腾彭同江罗利明
Owner SOUTHWEAT UNIV OF SCI & TECH
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