Method for preparing metastable-state vaterite calcium carbonate based on calciumethylene glycolate calcium method

A technology of calcium ethylene glycol and ethylene glycol, applied in the direction of calcium carbonate/strontium/barium, etc., to achieve the effects of simple process conditions, low cost of raw materials and equipment, and easy industrial production

Active Publication Date: 2017-12-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The currently published method of preparing vaterite CaCO by metathesis 3 There are many patents, including: the preparation method of micro-spindle structure vaterite calcium carbonate (publication number: CN105399128A), a method and device for preparing vaterite using a magnetic field (publication number: CN106495196A), vaterite calcium carbonate microspheres and Its preparation method (publication number: CN104692439A), a preparation method of micron-sized acicular vaterite calcium carbonate (publi...

Method used

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  • Method for preparing metastable-state vaterite calcium carbonate based on calciumethylene glycolate calcium method
  • Method for preparing metastable-state vaterite calcium carbonate based on calciumethylene glycolate calcium method
  • Method for preparing metastable-state vaterite calcium carbonate based on calciumethylene glycolate calcium method

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Experimental program
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Effect test

Embodiment 1

[0044] 1) 1.11g CaCl 2 Completely dissolved in 25mL of ethylene glycol to configure a calcium glycol solution with a concentration of 0.4mol / L; 1.06g Na 2 CO 3 Completely dissolve in 10mL deionized water to prepare a sodium carbonate solution with a concentration of 1mol / L;

[0045] 2) Mix the calcium ethylene glycol solution and the aqueous sodium carbonate solution in step 1) at room temperature (20°C), stir for 2 minutes to allow them to fully react, and do not age at room temperature (20°C), that is, age for 0 min;

[0046] 3) Centrifuge the unaged mixture suspension in step 2), then wash with absolute ethanol twice and wash with deionized water twice, wash with absolute ethanol to remove calcium chloride, wash with deionized water to remove sodium carbonate and sodium chloride, centrifuge, filter, collect the obtained white solid, and dry it in an electric constant temperature blast drying oven for 5-12 hours, and finally the white powder is stored in a centrifuge tube ...

Embodiment 2

[0048] 1) 1.11g CaCl 2 Completely dissolve in 25mL of ethylene glycol to form a calcium glycol solution with a concentration of 0.4mol / L; 1.24g Na 2 CO 3 ·H 2 O was completely dissolved in 9.82mL deionized water to form a sodium carbonate solution with a concentration of 1mol / L;

[0049] 2) Mix the calcium ethylene glycol solution and sodium carbonate aqueous solution in step 1) at room temperature (20°C), stir for 2 minutes to allow them to fully react, and then age at room temperature (20°C) for 10 minutes;

[0050] 3) When the aging time is terminated, the mixture suspension in step 2) is centrifuged, then washed with absolute ethanol twice and washed with deionized water twice, the calcium chloride is removed by washing with absolute ethanol, and the calcium chloride is removed by washing with deionized water Sodium carbonate and sodium chloride were centrifuged, filtered, and the obtained white solid was collected and dried in an electric constant temperature blast dry...

Embodiment 3

[0052] 1) 1.11g CaCl 2 Completely dissolved in 25mL of ethylene glycol to configure a calcium glycol solution with a concentration of 0.4mol / L; 1.06g Na 2 CO 3 Completely dissolve in 10mL deionized water to prepare a sodium carbonate solution with a concentration of 1mol / L;

[0053] 2) Mix the calcium ethylene glycol solution and sodium carbonate aqueous solution in step 1) at room temperature (20°C), stir for 2 minutes to allow them to fully react, and then age at room temperature (20°C) for 60 minutes;

[0054] 3) When the aging time is terminated, the mixture suspension in step 2) is centrifuged, then washed with absolute ethanol twice and washed with deionized water twice, the calcium chloride is removed by washing with absolute ethanol, and the calcium chloride is removed by washing with deionized water Sodium carbonate and sodium chloride were centrifuged, filtered, and the obtained white solid was collected and dried in an electric constant temperature blast drying ov...

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Abstract

The invention provides a method for preparing metastable-state vaterite calcium carbonate based on an ethylene glycol calcium calcium glycolate method. The method comprises the following steps: step (1) preparing an ethylene glycol calcium calcium glycolate solution (with the concentration of 0.01mol/L to 1.0mol/L) and a sodium carbonate solution (with the concentration of 0.025mol/L to 2.5mol/L); step (2) mixing and stirring the calcium glycolateethylene glycol calcium solution and the sodium carbonate solution in step (1) at 0 DEG C to 100 DEG C and sufficiently reacting; standing and ageing for 0 to 42h to obtain turbid liquid; step (3) carrying out centrifuging treatment on the turbid liquid obtained by step (2) and washing with absolute ethyl alcohol and de-ionized water; finally, centrifuging and filtering sediments, and drying. According to the method provided by the invention, a relatively simple double decomposition system is adopted; the whole preparation method has the advantages of simple technological conditions, low requirements on equipment and a green and environment-friendly preparation process; the weight ratio of vaterite CaCO3 in a product can be changed through adjusting experimental parameters (the concentration of reactants, mixed reaction temperature and standing and ageing time), and the weight ratio of the vaterite CaCO3 in the calcium carbonate product reaches 99.7 percent.

Description

technical field [0001] The invention relates to a method for preparing vaterite calcium carbonate, in particular to a method for preparing metastable vaterite calcium carbonate based on an ethylene glycol calcium method, and belongs to the field of preparation of inorganic non-metallic powder materials. Background technique [0002] As an inorganic chemical product, calcium carbonate (CaCO 3 ) are widely used in different fields such as rubber, paint, plastic, paper, ink, daily chemical and medicine. At normal temperature and pressure, there are six kinds of CaCO with the same composition but completely different structures in nature. 3 Minerals, respectively, amorphous CaCO 3 , CaCO 3 ·H 2 O, CaCO 3 ·6H 2 The thermodynamic stability of O, vaterite, aragonite, and calcite increases in turn. In addition to amorphous CaCO 3 Except, other structures are crystalline; CaCO 3 ·H 2 O and CaCO 3 ·6H 2 O is a crystal containing crystal water; three kinds of CaCO, vaterite...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/18C01P2006/80
Inventor 蒋久信陈传杰吴月徐松松王雪连肖博文赵华康
Owner HUBEI UNIV OF TECH
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