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A method for preparing calcium magnesium carbonate mineral ca1-xmgxco3 under high temperature and high pressure

A ca1-xmgxco3, calcium and magnesium carbonate technology, applied in the application of ultra-high pressure process, calcium carbonate/strontium/barium and other directions, can solve the problems of poor chemical stability, complicated operation process, and low sample purity, etc. Achieve the effect of large calcium and magnesium carbonate mineral particles, complex operation process and good chemical stability

Inactive Publication Date: 2019-04-26
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is: provide a kind of method for preparing calcium-magnesium carbonate mineral under high temperature and high pressure, to solve the present preparation calcium-magnesium carbonate mineral hydrothermal method, CO 2 The atmosphere protection annealing method has complex operation process, long reaction time, and technical problems such as low purity, poor chemical stability, and easy water absorption defects of the obtained samples. At the same time, this method has the characteristics of simple experimental operation and easy control of experimental conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2O) powder and anhydrous oxalic acid according to the stoichiometric molar ratio (1-x): x: 0.3, x = 0.1, weigh and grind and mix evenly, use a powder tablet machine to compress the mixture (about 0.25g) into a cylinder (Φ5mm×3mm), the sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, put the platinum-sealed sample in the h-BN tube: Drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0044] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

[004...

Embodiment 2

[0050] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O) powder and anhydrous oxalic acid according to the stoichiometric molar ratio (1-x): x: 0.3, x = 0.5, weigh and grind to mix evenly, and use a powder tablet machine to compress the mixture (about 0.25g) into a cylinder (Φ5mm×3mm), the sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, put the platinum-sealed sample in the h-BN tube: Drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0051] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

...

Embodiment 3

[0057] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O) powder and anhydrous oxalic acid according to the stoichiometric molar ratio (1-x): x: 0.3, x = 0.5, weigh and grind to mix evenly, and use a powder tablet machine to compress the mixture (about 0.25g) into a cylinder (Φ5mm×3mm), the sample is stuffed into a Φ5mm, 0.1mm thick platinum tube, and both ends are sealed with a welding torch. Using h-BN as the pressure transmission medium, put the platinum-sealed sample in the h-BN tube: Drill a Φ5mm hole in the center of the h-BN rod with a size of Φ10mm on the lathe to make the h-BN tube, and place the platinum-sealed sample Put it into the tube, and seal the two ends with h-BN sheets with a thickness of Φ5mm and a thickness of 2mm to complete the high-pressure assembly block. High voltage assembly block assembly method:

[0058] ① A circular through hole with a diameter of 12mm is drilled in the center of a 32×32mm pyrophyllite block;

...

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Abstract

The invention discloses a method for preparing calcium-magnesium carbonate mineral Cal-xMgxCO3 at a high temperature under high pressure. The method includes evenly grinding and mixing analytically-pure calcium carbonate, magnesium oxalate powder and anhydrous oxalic acid to obtain a mixture serving as an initial raw material, pressing the mixture into a cylinder by a tablet machine, inserting a cylindrical sample into a platinum tube, sealing two ends of the platinum tube by a welding gun, putting the sample sealed by platinum in an h-BN tube by taking h-BN as a pressure transfer medium, assembling the sample in the h-BN tube in a high-pressure combined assembly block, putting the high-pressure combined assembly block in a cubic press for high-temperature high-pressure reaction, taking out the reacted sample, opening the platinum tube by a diamond cutter, and naturally air-drying the sample to obtain calcium-magnesium carbonate minerals. By the method, the technical problems such as operation process complexity, long reaction time, and low purity, low chemical stability and proneness to water absorption of obtained samples in existing calcium-magnesium carbonate mineral preparation methods are solved.

Description

Technical field: [0001] The invention relates to the field of mineral material synthesis, in particular to a preparation of calcium-magnesium carbonate mineral Ca 1-x Mg x CO 3 The method, calcium magnesium carbonate mineral Ca of the present invention 1-x Mg x CO 3 It belongs to magnesium calcite-magnesium dolomite-calcium magnesite system. Background technique: [0002] In recent years, the greenhouse gas CO 2 Entering the atmosphere, causing global warming has attracted widespread attention. Carbonate minerals are the largest carbon pool in the earth’s sphere, and their circulation in the earth system affects the global carbon cycle system. Therefore, the carbon in sedimentary rocks It is especially important to study the stability of salt minerals and the morphology of their existence. The magnesium calcite-magnesium dolomite-calcium magnesite system is a common carbonate mineral in sedimentary rocks, and its chemical composition is Ca 1-x Mg x CO 3 Geologicall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B01J3/06
Inventor 梁文李和平李泽明尹远李瑞
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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