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A method for preparing iron dolomite under high temperature and high pressure

A high temperature and high pressure, iron dolomite technology, applied in the method of using atmospheric pressure to chemically change substances, the process of applying ultra-high pressure, chemical instruments and methods, etc., can solve the problem of poor chemical stability, complex operation process, Long reaction time and other problems, to achieve the effect of easy control of experimental conditions, complex operation process and long reaction time

Inactive Publication Date: 2019-04-16
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 iron dolomite under high temperature and high pressure, so as to solve the complicated operation process, long reaction time and the low purity and chemical stability of the current iron 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

[0042] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O) powder and anhydrous oxalic acid as starting materials, according to stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x value 0.1, grind and mix evenly, use powder tablet press to mix the mixture (about 0.25g) Finally, it is pressed into a cylinder (Φ5mm×3mm), and the sample is stuffed into a platinum tube with a diameter of Φ5mm and a thickness of 0.1mm, and the two 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: ...

Embodiment 2

[0049] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O) powder and anhydrous oxalic acid as starting materials, according to stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x value 0.1, grind and mix evenly, use powder tablet press to mix the mixture (about 0.25g) Finally, it is pressed into a cylinder (Φ5mm×3mm), and the sample is stuffed into a platinum tube with a diameter of Φ5mm and a thickness of 0.1mm, and the two 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: ...

Embodiment 3

[0056] Analytical pure calcium carbonate, magnesium oxalate dihydrate (MgC 2 o 4 2H 2 O), ferrous oxalate dihydrate (FeC 2 o 4 2H 2 O) powder and anhydrous oxalic acid as starting materials, according to stoichiometric molar ratio 0.5: (0.5-x): x: 0.3, x value 0.4, grind and mix evenly, use powder tablet press to mix the mixture (about 0.25g) Finally, it is pressed into a cylinder (Φ5mm×3mm), and the sample is stuffed into a platinum tube with a diameter of Φ5mm and a thickness of 0.1mm, and the two 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: ...

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Abstract

The invention discloses a method for preparing ferrodolomite under high temperature and high pressure, which comprises the steps of grinding and uniformly mixing analytically pure calcium carbonate, magnesium oxalate dihydrate, ferrous oxalate dehydrate powder and anhydrous oxalic acid according to stoichiometric molar ratio; pressing an obtained mixture into a cylindrical shape by a tablet press; putting a cylindrical sample into a platinum tube, sealing the two ends with a welding gun; taking h-BN as a pressure transmitting medium, putting the platinum sealed sample into an h-BN tube; assembling the sample loaded in the h-BN tube in a high-pressure synthesis assembly block, putting the sample in a six-faced top large press for high temperature and high pressure reaction; taking out the reacted sample, opening the platinum tube by a diamond cutter, naturally airing to obtain the ferrodolomite. The method provided by the invention solves the defects that the present ferrodolomit e preparation method is complex in operation process and long in reaction time, and the obtained sample is low in purity, poor in chemical stability and easy to absorb water.

Description

Technical field: [0001] The invention relates to the field of mineral material synthesis, in particular to a method for preparing iron 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 siderite are common carbonate minerals in sedimentary rocks. Due to the similar crystal structure of calcite, magnesite and siderite, they are often used in nature as calcite-magnesite-siderite three end members Formation of dolomite Ca 0.5 Mg 0.5-x Fe x CO 3 And exist, that is, calcium ions, magnesium ions and iron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00B01J3/06
CPCB01J3/062C01G49/009C01P2002/77
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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