Method for synthesizing trigonal strontium calcium carbonate SrCa(CO3)2 at high temperature and high pressure

A technology of high temperature and high pressure synthesis, strontium calcium carbonate, applied in the field of earth science mineralogy research, can solve problems such as the lack of end member phases

Active Publication Date: 2021-09-10
GUIZHOU EDUCATION UNIV +1
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Problems solved by technology

It is speculated that the strontium carbonate ore SrCO 3 The formed strontium-containing trigonal dicarbonate system SrMg(CO 3 ) 2 -SrFe(CO 3 ) 2 -SrMn(CO 3 ) 2 -Tripartite SrCa(CO 3 ) 2 , however, only the tripartite SrMg(CO 3 ) 2 One endmember phase and all other endmember phases are absent

Method used

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Embodiment

[0018] A high temperature and high pressure synthesis of trigonal strontium calcium carbonate SrCa(CO 3 ) 2 method, including the following steps:

[0019] Step 1. Use analytically pure strontium carbonate SrCO 3 and analytically pure calcium carbonate CaCO 3 Grind and mix uniformly with a molar ratio of 1:1 as the starting material;

[0020] Step 2. Use a tablet press to press the mixture powder in step 1 into a cylindrical shape of Φ5×3mm. Use a 0.02mm thick gold foil to wrap the cylindrical sample as a sample and place it in an h-BN tube, using h-BN as the pressure transmission medium;

[0021] Step 3. Assemble the h-BN tube containing the sample in step 2 into a high-pressure synthesis assembly block and place it in a six-sided top press for high-temperature and high-pressure reaction. The high-temperature and high-pressure reaction conditions are 0.5GPa, 700°C, and keep Press and hold for 6 hours, then quench, and then quickly release the pressure to normal pressure ...

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Abstract

The invention discloses a method for synthesizing trigonal strontium calcium carbonate SrCa(CO3)2 at high temperature and high pressure. Analytically pure strontium carbonate SrCO3 and analytically pure calcium carbonate CaCO3 are ground and uniformly mixed according to a molar ratio of 1:1 to obtain a starting material, and high-temperature and high-pressure solid-phase reaction is conducted to obtain trigonal strontium calcium carbonate Sr(CO3)2. The high-temperature and high-pressure reaction conditions are 0.5 GPa and 700 DEG C, and quenching is carried out after pressure and heat preservation is carried out for 6 hours. The trigonal phase of the strontium calcium carbonate SrCa(CO3)2 is synthesized for the first time, the stable existence of the strontium calcium carbonate SrCa(CO3)2 is proved, temperature and pressure boundary conditions are given, and the technical problem of current mineralogy research is solved.

Description

technical field [0001] The invention relates to the field of earth science mineralogy research, and relates to a high temperature and high pressure synthetic trigonal strontium calcium carbonate SrCa(CO 3 ) 2 Methods. Background technique [0002] Carbonate minerals are widely distributed on the earth. According to the structure-component classification, simple carbonate minerals are divided into calcite type and aragonite type: the main four-terminal member of calcite type is composed of magnesite MgCO 3 , Siderite FeCO 3 , Rhodochrosite MnCO 3 and calcite CaCO 3 Composition; the main four end members of the aragonite type are composed of aragonite CaCO 3 , strontium carbonate ore SrCO 3 , white lead ore PbCO 3 and poison barite BaCO 3 constitute. Under complex geological conditions such as sedimentation and metamorphism, calcite-type and aragonite-type carbonates can form composite bicarbonates with more complex structures. Currently, poisonous barite BaCO 3 The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2006/66C01P2006/80
Inventor 牛延慧梁文孟勇徐海丽
Owner GUIZHOU EDUCATION UNIV
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