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Method for preparing kutnohorite at high temperature under high pressure

A high temperature and high pressure, dolomite technology, applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., can solve the problems of poor chemical stability, complicated operation process, long reaction time, etc., and achieve easy control of experimental conditions and operation. The effect of complex process and long reaction time

Active Publication Date: 2018-01-30
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 by the present invention is to provide a method for preparing manganese dolomite under high temperature and high pressure, so as to solve the complicated operation process, long reaction time and low purity and chemical stability of the obtained manganese dolomite preparation method. Not good, easy to absorb water defects and other technical problems. 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

[0045] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), manganese carbonate powder and anhydrous oxalic acid as starting raw materials, according to the stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x value 0.1, grind and mix evenly, use powder tablet machine to mix the mixture (approximately 0.25g) powder is pressed 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, place 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:

[0046]① A circular through hole with a diameter of ...

Embodiment 2

[0052] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), manganese carbonate powder and anhydrous oxalic acid as starting raw materials, according to the stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x value 0.1, grind and mix evenly, use powder tablet machine to mix the mixture (approximately 0.25g) powder is pressed 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, place 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:

[0053] ① A circular through hole with a diameter of...

Embodiment 3

[0059] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), manganese carbonate powder and anhydrous oxalic acid are used as starting materials, according to the stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x takes a value of 0.4, grind and mix evenly, and use a powder tablet press to mix the mixture (approx. 0.25g) powder is pressed 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, place 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:

[0060] ① A circular through hole with...

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Abstract

The invention discloses a method for preparing kutnohorite at a high temperature under high pressure. The method includes evenly grinding and mixing analytically-pure calcium carbonate, magnesium oxalate (MgC2O4.2H2O), manganese carbonate powder and anhydrous oxalic acid according to stoichiometry, pressing a 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 the kutnohorite. By the method, the technical problems such as operation process complexity, long reaction time, andlow purity, low chemical stability and proneness to water absorption of obtained samples in existing kutnohorite preparation methods are solved.

Description

Technical field: [0001] The invention relates to the field of mineral material synthesis, in particular to a method for preparing manganese dolomite under high temperature and high pressure. 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. Calcite, magnesite and rhodochrosite are common carbonate minerals in sedimentary rocks. Due to the similar crystal structure of calcite, magnesite and rhodochrosite, manganese dolomite is often formed in nature with three end members of calcite-magnesite-rhodrosite Stone Ca 0.5 Mg 0.5-x mn x CO 3 And exist, that is, calcium ions, ma...

Claims

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Application Information

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IPC IPC(8): C01G45/00
Inventor 李瑞唐红峰
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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