a caco 3 Coated corundum aggregate and its preparation method and application
A technology of aggregate and corundum, which is applied in the field of CaCO3-coated corundum aggregate and its preparation, can solve the problems of castable performance degradation and achieve the effects of improving thermal shock resistance, improving thermal shock stability, and excellent mechanics
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Embodiment 1
[0052] This embodiment discloses a CaCO 3 The preparation method of coated corundum aggregate, the method first prepares a precursor impregnation solution with an organic acid aqueous solution and a calcium source as raw materials, then fully impregnates the corundum aggregate in the precursor impregnation solution, and finally immerses the impregnated corundum bone After drying and calcination, CaCO was obtained 3 Coated with corundum aggregate.
[0053] The organic acid aqueous solution in this embodiment is an aqueous solution of citric acid; the calcium source is CaCO 3 ; where CaCO 3 The molar ratio of citric acid and citric acid is 1:3, and Ca in the precursor impregnation solution 2+ The concentration is 0.05mol / L, and the concentration of citric acid corresponds to it in molar ratio.
[0054] The specific steps are:
[0055] Step 1, 0.15mol / L citric acid was completely dissolved in 1L deionized water, and 5g calcium carbonate was slowly added to the aqueous soluti...
Embodiment 2
[0059] The difference between this example and Example 1 is: 0.45 mol / L of citric acid was completely dissolved in 1 L of deionized water, and 15 g of calcium carbonate was slowly added to the aqueous solution of citric acid one by one under ultrasonics (obtained in the precursor dipping solution, Ca 2+ Concentration is 0.15mol / L), ultrasonic vibration for 30min and after the reaction is complete, a precursor impregnation solution can be obtained, and the precursor impregnation solution is a mixed solution of calcium hydrogen citrate and citric acid with a pH value of 3.1. The remaining steps are the same as in Example 1, to obtain the CaCO numbered C15 3 Coated with corundum aggregate.
[0060] For the CaCO prepared in Example 2 3 Coated corundum aggregates were subjected to X-ray diffraction analysis and SEM analysis to obtain XRD patterns and SEM patterns, see image 3 , Figure 5 .
Embodiment 3
[0062] The difference between this example 3 and Example 1 is: 0.75 mol / L of citric acid is completely dissolved in 1 L of deionized water, and 25 g of calcium carbonate is slowly added to the aqueous solution of citric acid under ultrasound (obtained in the precursor dipping solution). , Ca 2+ Concentration is 0.25mol / L), ultrasonic vibration for 30min and after the reaction is complete, a precursor impregnation solution can be obtained, and the precursor impregnation solution is a mixed solution of calcium hydrogen citrate and citric acid with a pH value of 3.0. The remaining steps are the same as in Example 1, and the CaCO numbered as C25 can be obtained. 3 Coated with corundum aggregate.
[0063] For the CaCO prepared in Example 3 3 Coated corundum aggregates were subjected to X-ray diffraction analysis and SEM analysis to obtain XRD patterns and SEM patterns, see image 3 , Image 6 .
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Abstract
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