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A kind of method for preparing anhydrous magnesium carbonate under high temperature and high pressure

Anhydrous magnesium carbonate, high temperature and high pressure technology, applied in the direction of magnesium carbonate, etc., can solve the problems of low purity of magnesium carbonate, poor chemical stability, complicated operation process, etc., achieve chemical stability, not easy to absorb water, short reaction time, The effect of simple operation process

Inactive Publication Date: 2017-07-18
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved in the present invention is: provide a kind of method for preparing anhydrous magnesium carbonate under high temperature and high pressure, to solve existing technology and adopt hydrothermal method, CO 2 Anhydrous magnesium carbonate is prepared by atmosphere protection annealing, but the operation process is complicated, the reaction time is long, and the obtained magnesium carbonate has technical problems such as low purity, poor chemical stability and easy water absorption.

Method used

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  • A kind of method for preparing anhydrous magnesium carbonate under high temperature and high pressure
  • A kind of method for preparing anhydrous magnesium carbonate under high temperature and high pressure
  • A kind of method for preparing anhydrous magnesium carbonate under high temperature and high pressure

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Embodiment 1

[0055] Using analytically pure magnesium carbonate trihydrate as the starting material, powder magnesium carbonate trihydrate (about 0.30g) was pressed into a cylinder (Φ6mm×5mm) using a powder tablet press, and wrapped with silver foil (0.025mm) to make Form the sample; use NaCl as the pressure transmission medium, and use a powder tablet press to press the sample into the NaCl salt column (Φ10mm×12mm) to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0056] ① A circular through hole with a diameter of 14mm is drilled in the center of a 32×32mm pyrophyllite block;

[0057] ② A graphite heating furnace with an outer diameter of 14mm and an inner diameter of 10mm is placed inside the circular through hole of the pyrophyllite block;

[0058] ③ A sodium chloride cylinder containing a magnesium carbonate trihydrate cylinder is placed in the middle of the graphite heating furnace, and the upper and lower sides are blocked with pyrophyllit...

Embodiment 2

[0062] Using analytically pure magnesium carbonate trihydrate as the starting material, powder magnesium carbonate trihydrate (about 0.30g) was pressed into a cylinder (Φ6mm×5mm) using a powder tablet press, and wrapped with silver foil (0.025mm) to make Form the sample; use NaCl as the pressure transmission medium, and use a powder tablet press to press the sample into the NaCl salt column (Φ10mm×12mm) to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0063] ① A circular through hole with a diameter of 14mm is drilled in the center of a 32×32mm pyrophyllite block;

[0064] ②A graphite heating furnace with an outer diameter of 14mm and an inner diameter of 10mm is placed inside the circular through hole of the pyrophyllite block;

[0065] ③ A sodium chloride cylinder containing a magnesium carbonate trihydrate cylinder is placed in the middle of the graphite heating furnace, and the top and bottom are blocked with pyrophyllite plugs ...

Embodiment 3

[0069] Using analytically pure magnesium carbonate trihydrate as the starting material, powder magnesium carbonate trihydrate (about 0.30g) was pressed into a cylinder (Φ6mm×5mm) using a powder tablet press, and wrapped with silver foil (0.025mm) to make Form the sample; use NaCl as the pressure transmission medium, and use a powder tablet press to press the sample into the NaCl salt column (Φ10mm×12mm) to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0070] ① A circular through hole with a diameter of 14mm is drilled in the center of a 32×32mm pyrophyllite block;

[0071] ②A graphite heating furnace with an outer diameter of 14mm and an inner diameter of 10mm is placed inside the circular through hole of the pyrophyllite block;

[0072] ③ A sodium chloride cylinder containing a magnesium carbonate trihydrate cylinder is placed in the middle of the graphite heating furnace, and the top and bottom are blocked with pyrophyllite plugs ...

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Abstract

The invention discloses a method for preparing anhydrous magnesium carbonate under high temperature and high pressure. The method includes: using analytically-pure nesquehonite powder as the initial raw material; using a tablet press to press the nesquehonite powder into a cylinder, and using silver foil to wrap the cylinder to obtain a sample; grinding sodium chloride into powder above 200 meshes, and drying in a drying oven under 150 DEG C for 2 hours; using the dried sodium chloride powder to prepare a sodium chloride cylinder sample containing the sample obtained in the second step; assembling the sodium chloride cylinder sample into a high pressure synthesis assembling block, and placing into a cubic press for high-temperature and high-pressure reaction; taking out the sample after the reaction, and removing the silver foil on the surface of the sample to obtain the anhydrous magnesium carbonate. By the method, the technical problems that the prior art which uses a hydrothermal method, CO2 atmosphere protection and annealing to prepare the anhydrous magnesium carbonate is complex in operation process and long in reaction time, and the prepared anhydrous magnesium carbonate is low in purity, poor in chemical stability and prone to water absorption are solved.

Description

[0001] Technical field: [0002] The invention belongs to the field of functional material synthesis, in particular to a method for preparing anhydrous magnesium carbonate under high temperature and high pressure. [0003] Background technique: [0004] In industry, magnesium carbonate (MgCO 3 ) can be used as an important inorganic flame retardant, which has the advantages of non-toxicity, good thermal stability, and non-corrosion. In addition, it can also be used as an additive in food processing, pharmaceuticals, rubber and other fields. And the magnesium carbonate products provided by the market at present, except natural magnesite, are generally magnesium carbonate trihydrate and hydrated basic magnesium carbonate. The naturally occurring magnesite, because it is very easy to form isomorphism with siderite, rhodochrosite, etc., often contains Fe 2+ , Mn 2+ Impurities such as can't reach the required purity of magnesium carbonate single phase research. [0005] In indus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
CPCC01F5/24C01P2002/72C01P2002/82C01P2006/82
Inventor 梁文胡志明李和平
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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