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Method for preparing pure calcite-phase calcium carbonate in anhydrous system

A technology of anhydrous system and pure formula, which is applied in the field of materials, can solve problems that do not conform to scientific principles, increase reaction temperature, and complicated operation, and achieve the effect of continuously adjustable operating procedures, simple process conditions, and easy experimental process

Active Publication Date: 2021-11-19
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent points out that no by-product soluble salts will be produced and the obtained product is pure, the removal of by-products should be achieved by raising the reaction temperature; low temperature is required for the beginning of dissolution, high temperature is required for the reaction, and alcohol must be used after the product is formed. Washing, these all make the technical operation complicated; and the final product is the most easily obtained calcite phase CaCO 3 , so the cost is high relative to the product calcite
In addition, if the reactants are calcium oxide and ammonium carbonate, the calcium oxide in the alcohol solution cannot be hydrolyzed into calcium hydroxide, thus forming CaCO 3 and "Ammonium Oxide", which seems to defy scientific principles
Therefore, it is extremely difficult for this technology to realize market production.

Method used

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  • Method for preparing pure calcite-phase calcium carbonate in anhydrous system
  • Method for preparing pure calcite-phase calcium carbonate in anhydrous system
  • Method for preparing pure calcite-phase calcium carbonate in anhydrous system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Prepare 0.1mol / L calcium chloride ethylene glycol solution and 0.1mol / L potassium carbonate ethylene glycol solution;

[0035] 2. Mix the calcium chloride ethylene glycol solution and the potassium carbonate ethylene glycol solution in step 1 at 10°C, stir for 2 minutes to allow them to fully react, and then stand and age at 10°C for different times. 1min, 60min, 240min and 720min;

[0036] 3. Centrifuge the aged suspension, wash it with water, then centrifuge again, and then dry it in an electric heating constant temperature blast drying oven for 5-12 hours, and finally obtain a white powder;

[0037] 4. Carry out XRD detection to the obtained four groups of products, the results are as follows: figure 1 shown, indicating that the resulting CaCO 3 It is pure calcite.

Embodiment 2

[0039] 1. Prepare 0.3mol / L calcium chloride ethylene glycol solution and 0.3mol / L potassium carbonate ethylene glycol solution;

[0040] 2. Mix the calcium chloride ethylene glycol solution and potassium carbonate ethylene glycol solution in 1 at 20°C, stir for 2 minutes to make them fully react, and then stand and age at 20°C for different times. The aging time is respectively 1min, 60min, 240min and 720min;

[0041] 3. Centrifuge the aged suspension, wash it with water, then centrifuge again, and then dry it in an electric heating constant temperature blast drying oven for 5-12 hours, and finally obtain a white powder;

[0042] 4. Carry out XRD detection and observation on the obtained four groups of products, the results are as follows figure 2 with image 3 shown, indicating that the resulting CaCO 3 It is pure calcite, and the calcite particles are rhombohedral or cubic.

Embodiment 3

[0044] 1. Prepare 0.5mol / L calcium chloride ethylene glycol solution and 0.5mol / L potassium carbonate ethylene glycol solution;

[0045] 2. Mix the calcium chloride ethylene glycol solution and the potassium carbonate ethylene glycol solution in 1 at 30°C, stir for 2 minutes to allow them to fully react, and then stand and age at 30°C for different times. The aging times are respectively 1min, 60min, 240min and 720min;

[0046] 3. Centrifuge the aged suspension, wash it with water, then centrifuge again, and then dry it in an electric heating constant temperature blast drying oven for 5-12 hours, and finally obtain a white powder;

[0047] 4. Carry out XRD detection to the obtained product, the result is as follows Figure 4 shown, indicating that the resulting CaCO 3 It is pure calcite.

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Abstract

The invention discloses a method for preparing pure calcite-phase calcium carbonate in an anhydrous system, the method comprises the following steps: fully dissolving calcium chloride powder in ethylene glycol at normal temperature to obtain a calcium chloride ethylene glycol solution of an alcohol-calcium complex; fully dissolving potassium carbonate powder in ethylene glycol at normal temperature to obtain a potassium carbonate ethylene glycol solution of a potassium alcoholate complex; then mixing the calcium chloride glycol solution and the potassium carbonate glycol solution, quickly stirring and uniformly mixing, and then standing for 0-12 hours, so that the calcium alcoholate complex and the potassium alcoholate complex fully react; and after the reaction is finished, carrying out centrifugal treatment on the generated turbid liquid, washing the obtained precipitate with water to remove a byproduct potassium chloride, and finally centrifuging and drying the precipitate to obtain white powder, namely pure calcite phase CaCO3. The process is simple, the calcite phase CaCO3 generating nanoparticles is regulated and controlled through the calcium alcoholate complex and the potassium alcoholate complex, and the particle size uniformity of the obtained product is good.

Description

technical field [0001] The invention belongs to the field of materials, and relates to the preparation technology of inorganic non-metallic powder materials, in particular to a method for preparing pure calcite-phase calcium carbonate in an anhydrous system. Background technique [0002] Calcium Carbonate (CaCO 3 ), is one of the most widely used inorganic non-metallic fillers. According to the preparation method, CaCO 3 Heavy CaCO 3 (heavy calcium, GCC) and light CaCO 3 (light calcium, also known as precipitated CaCO 3 , PCC). Heavy calcium is the use of physical methods to contain CaCO 3 More than 90% of limestone, dolomite and other minerals are processed through cleaning, crushing, crushing, grading, and separation. Light calcium is prepared by chemical methods, according to whether it is activated or not, it can be divided into ordinary light CaCO 3 and nano-active CaCO 3 . [0003] Since mechanical pulverization cannot reach the nanoscale, nano-CaCO 3 are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/183C01F11/181C01P2002/72C01P2004/03C01P2004/61
Inventor 蒋久信徐圣波肖浩东陶冲石蕊谭振亚谢天伦
Owner HUBEI UNIV OF TECH
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