Method for preparing high-purity monocalcium aluminate by solid-phase reaction

A technology of solid phase reaction and aluminate, which is applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, etc., can solve the problem of large performance gap of monocalcium aluminate, high price of metal alkoxide, The test process takes a long time to achieve the effect of simple preparation process

Inactive Publication Date: 2016-08-17
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 the agate bowl to fully mix the raw materials, and then use platinum / 铑坩埚 to be fully heated at 1000 ° C, then heat up to 1200 ° C for 4 hours, turn off the heating furnace slowly to the room temperature, remove and use the agate mantleGrinding, making it about 350M than the surface area 2 / KG's fine powder, then heat the temperature to 1200 ° C for 4 hours, then turn off the heating furnace to slowly cool it to room temperature, remove the agate manto in a closed environment, use the agate manto to grind it to about 350m than the surface area again, about 350m. 2 After / kg, the aluminum acid is obtained.

Embodiment 2

[0014] Example 2: Use the agate bowl to fully mix the raw materials, and then use platinum / 铑坩埚 to be fully heated at 1000 ° C. Then heating up to 1400 ° C for 5 hours and turn off the heating furnace to slow down to room temperature.Grinding, making it about 350M than the surface area 2 / KG's fine powder, then heat the temperature to 1400 ° C for 5 hours, then turn off the heating furnace to slowly cool it to room temperature, remove the agate manto in a closed environment, use the agate manto to grind it to about 350m than the surface area again, about 350m. 2 After / kg, the aluminum acid is obtained.

Embodiment 3

[0015] Example 3: Use the agate bowl to fully mix the raw materials, and then use platinum / 铑坩埚 to be fully heated at 1000 ° C. Then heating up to 1400 ° C for 6 hours and turn off the heating furnace to slow down to room temperature.Grinding, making it about 350M than the surface area 2 / KG's fine powder, then heat the temperature to 1400 ° C for 6 hours, then turn off the heating furnace to slowly cool it to room temperature, remove the agate manto in a closed environment, use the agate manto to grind to the surface area of about 350m again, about 350m. 2 After / kg, the aluminum acid is obtained.

[0016] Table 1 Formula (quality ratio) of aluminic acid and calcium raw material

[0017] Alumina Calcium carbonate Example 1 1 0.80 Example 2 1 0.85 Example 3 1 1.00

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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 present invention involves a method of preparing high -pure aluminumic acid with a solid reaction. Background technique [0002] One of the main minerals of aluminate calcium, as aluminum acid, has always attracted much attention.When using the more popular solution gel legal system nowadays, its test process has a long test process, and the reflection of gas and organic matter leads to a large size contraction of the sample, and the price of some metal alcohol salt is high.The performance gap between aluminum acid in aluminum cement is large.If the combustion synthesis method is adopted, the two types of nitrate (calcium nitrate and aluminum nitrate) are used in use and stored at the time.The patent of the present invention aims to draw on the production process of ordinary aluminum acid cement and improve the mixed quality ratio of raw materials. It can prepare a high -purity aluminum acid with a purity of more than 90%, up to 98.52%, which is higher ...

Claims

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Application Information

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Patent Type & Authority Applications(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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