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A method for preparing high-purity monocalcium aluminate by solid-phase reaction

A solid-phase reaction, aluminate technology, applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, etc., can solve the large performance gap of monocalcium aluminate, large sample volume shrinkage, nitric acid Salt explosion risk and other problems, to achieve the effect of simple preparation process

Inactive Publication Date: 2018-08-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the more popular sol-gel method is used to prepare, the test process takes a long time, the escape of gas and organic matter leads to a large shrinkage of the sample volume, and the price of some metal alkoxides is high, and the hydration activity of the prepared product is not good, which is different from the real one. There is a large gap in the performance of monocalcium aluminate in aluminate cement
If the combustion synthesis method is adopted, the two nitrates (calcium nitrate and aluminum nitrate) used are prone to explosion risks when improperly used and stored

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Use an agate mortar to fully mix the raw materials, then use a platinum / rhodium crucible to fully heat treat at 1000°C, then heat up to 1200°C for 4 hours, then turn off the heating furnace and let it slowly cool to room temperature, take it out and use an agate mortar Grinding to make it a specific surface area of ​​about 350m 2 / Kg of fine powder, then heat up to 1200 ° C for 4 hours, then turn off the heating furnace and let it cool slowly to room temperature, take it out and use an agate mortar to grind again in a closed environment to a specific surface area of ​​about 350m 2 / Kg to obtain monocalcium aluminate, and the obtained product was analyzed by phase analysis to obtain a CA purity of 90.52%.

Embodiment 2

[0014] Example 2: Use an agate mortar to fully mix the raw materials, then use a platinum / rhodium crucible to fully heat treat at 1000°C, then heat up to 1400°C for 5 hours, then turn off the heating furnace and let it slowly cool to room temperature, take it out and use an agate mortar Grinding to make it a specific surface area of ​​about 350m 2 / Kg of fine powder, then heat up to 1400°C for 5 hours, then turn off the heating furnace and let it slowly cool to room temperature, take it out and use an agate mortar to grind again in a closed environment to a specific surface area of ​​about 350m 2 / Kg to obtain monocalcium aluminate, and the obtained product was analyzed by phase to obtain a CA purity of 98.52%.

Embodiment 3

[0015] Example 3: Use an agate mortar to fully mix the raw materials, then use a platinum / rhodium crucible to fully heat treat at 1000°C, then heat up to 1400°C for 6 hours, then turn off the heating furnace and let it slowly cool to room temperature, take it out and use an agate mortar Grinding to make it a specific surface area of ​​about 350m 2 / Kg of fine powder, then heat up to 1400°C for 6 hours, then turn off the heating furnace and let it cool slowly to room temperature, take it out and use an agate mortar to grind again in a closed environment to a specific surface area of ​​about 350m 2 / Kg to obtain monocalcium aluminate, and the obtained product was analyzed by phase analysis to obtain a CA purity of 90.06%.

[0016] Formulation (mass ratio) of monocalcium aluminate raw material of table 1

[0017]

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PUM

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Abstract

The invention relates to a method for preparing high-purity monocalcium aluminate by a solid-phase reaction. The monocalcium aluminate (CaO.Al2O3, CA) is prepared by the following steps: sufficiently and uniformly mixing 1 part of aluminum oxide (Al2O3) powder and 0.8-1 part of calcium carbonate (CaCO3) powder both by mass in an agate mortar in a closed environment; performing sufficient heat treatment with a platinum / rhodium crucible at 1000-1200 DEG C; heating to 1200-1400 DEG C and preserving heat for 4-6 hours; closing the heating furnace and slowly cooling to room temperature; grinding the mixture into fine-particle powder in the agate mortar in a closed environment; heating to 1200-1400 DEG C and preserving heat for 4-6 hours; closing the heating furnace and slowly cooling to room temperature; and levigating the powder in the agate mortar in a closed environment to obtain monocalcium aluminate. In the invention, the preparation technology is simple, the tabletting and granulating of raw materials are not needed, the reaction raw materials are nontoxic, and the product purity is very high.

Description

technical field [0001] The invention relates to a method for preparing high-purity monocalcium aluminate by solid phase reaction. Background technique [0002] Monocalcium aluminate is one of the main minerals of aluminate cement clinker, and its synthesis method has attracted much attention. When the more popular sol-gel method is used to prepare, the test process takes a long time, the escape of gas and organic matter leads to a large shrinkage of the sample volume, and the price of some metal alkoxides is high, and the hydration activity of the prepared product is not good, which is different from the real one. The properties of monocalcium aluminate in aluminate cement vary greatly. If the combustion synthesis method is used, the two nitrates used (calcium nitrate and aluminum nitrate) are prone to explosion risks when used and stored improperly. The patent of this invention aims to learn from the production process of ordinary aluminate cement, and improve the mixing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C01F7/16
CPCC01F7/164C01P2006/80C04B7/32
Inventor 胡匡艺刘贤萍王培铭
Owner TONGJI UNIV
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