Preparation method for aragonite calcium carbonate whisker with high length-diameter ratio

A technology of calcium carbonate whiskers and high aspect ratio, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of long reaction cycle, large magnesium calcium, high raw material cost, etc., and achieve high synthesis efficiency, The effect of low magnesium calcium ratio and simple operation

Inactive Publication Date: 2015-07-22
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to react magnesium salt and calcium hydroxide slurry at room temperature to 80°C for 0.5 to 2 hours to reach a reaction equilibrium, and then introduce carbon dioxide to carry out carbonization reaction. Large, the ratio R of calcium to magnesium is about 4.0, and the cost of raw materials is relatively high

Method used

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  • Preparation method for aragonite calcium carbonate whisker with high length-diameter ratio
  • Preparation method for aragonite calcium carbonate whisker with high length-diameter ratio
  • Preparation method for aragonite calcium carbonate whisker with high length-diameter ratio

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation concentration is (1) 2.0wt%; (2) 2.9wt%; (3) 3.8wt% or (4) 4.7wt% Ca(OH) 2 The suspension is added to the carbonization reactor, and the magnesium chloride aqueous solution is added according to the magnesium-calcium ratio R being 1.0, and the carbonization temperature is controlled at 75°C, and stirring is applied, and then the flow rate is 20m 3 / (h·m 3 Suspension) of CO 2 And the flow rate is 40m 3 / (h·m 3 Suspension) of N 2 After mixing, it is passed into the gas distributor at the bottom of the carbonization reaction kettle, and a digital display pH meter is used to track the whole process of carbonization reaction. When the pH of the reaction slurry is 7, the aeration is stopped, and the carbonization reaction ends. The slurry after carbonization is suction filtered, washed and dried. Calculation of whisker calcium carbonate aragonite phase content and aspect ratio, the results are shown in Table 1.

Embodiment 2

[0028] The preparation concentration is 2.0wt% Ca(OH) 2 The suspension is added to the carbonization reactor, and the magnesium chloride aqueous solution is added according to the magnesium-calcium ratio R being 1.0, and the carbonization temperature is controlled at (1) 55°C; (2) 65°C; (3) 75°C or (4) 85°C, and stirring is applied , and then set the flow rate to 20m 3 / (h·m 3 Suspension) of CO 2And the flow rate is 40m 3 / (h·m 3 Suspension) of N 2 After mixing, it is passed into the gas distributor at the bottom of the carbonization reaction kettle, and a digital display pH meter is used to track the whole process of carbonization reaction. When the pH of the reaction slurry is 7, the aeration is stopped, and the carbonization reaction ends. The slurry after carbonization is suction filtered, washed and dried. Calculation of whisker calcium carbonate aragonite phase content and aspect ratio, the results are shown in Table 1.

Embodiment 3

[0030] The preparation concentration is 2.0wt% Ca(OH) 2 Add the suspension into the carbonization reactor, add magnesium chloride aqueous solution according to the ratio of magnesium to calcium (1) R=0.8; (2) R=1.0; (3) R=1.2 or (4) R=1.4, and control the carbonization temperature to 75°C , apply agitation, and then apply the 20m 3 / (h·m 3 Suspension) of CO 2 And the flow rate is 40m 3 / (h·m 3 Suspension) of N 2 After mixing, it is passed into the gas distributor at the bottom of the carbonization reaction kettle, and a digital display pH meter is used to track the whole process of carbonization reaction. When the pH of the reaction slurry is 7, the aeration is stopped, and the carbonization reaction ends. The slurry after carbonization is suction filtered, washed and dried. Calculation of whisker calcium carbonate aragonite phase content and aspect ratio, the results are shown in Table 1.

[0031] Table 1

[0032]

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Abstract

The invention relates to a preparation method for an aragonite calcium carbonate whisker with a high length-diameter ratio. The preparation method comprises the following specific implementation steps: adding a 1.0-8.2 wt% prepared Ca(OH)2 suspension liquid into a carbonation reactor, adding MgCl2 in the aqueous solution form into the reactor, controlling the magnesium-calcium ratio R to be 0.6-2.0 and the carbonization temperature to be 30-85 DEG C, under the action of stirring, mixing CO2 with the flow rate of (5-120)m<3> / (h.m<3> suspension liquid)and N2, introducing the mixture of the CO2 and N2 to a gas distributor at the bottom of the carbonation reactor, and tracking the whole process of carbonation reactor by adopting a digital display pH meter; performing suction filtration and washing on the slurry generated after the carbonization is completed, drying for 5 hours at the temperature of 80 DEG C, and crushing, so as to obtain a calcium carbonate whisker sample. Compared with the existing method for preparing the aragonite calcium carbonate whisker through a carbonation method, the preparation method provided by the invention has the advantages that the calcium carbonate whisker with the high length-diameter ratio is synthesized by adopting the one-step method, the multistage growth is avoided, and the operation is simpler; the co-heating reaction balance phase of magnesium chloride and calcium hydroxide is avoided, the magnesium-calcium ratio in the reaction slurry is low, and the synthesis efficiency is higher.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, and relates to a preparation method of aragonite calcium carbonate whiskers with high aspect ratio. Background technique [0002] Inorganic whiskers, as a material grown in the form of a single crystal, generally exhibit a needle-like or fibrous shape with a high aspect ratio. The atomic arrangement is highly ordered, the whisker structure is relatively complete, and the internal defects are less, so its strength and modulus are close to the theoretical value of the complete whisker material. It is a high-performance reinforcement and toughening of new composite materials. agent. [0003] Currently, SiC, SiN, Al 2 o 3 , ZnO, potassium titanate, mullite, aluminum borate and a few whiskers have been successfully industrialized, but their large-scale application and development have been hindered by their high production costs. Looking for a more cost-effective whisker to replace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/62C30B29/10
Inventor 童张法胡超李立硕韦藤幼曾美琪
Owner GUANGXI UNIV
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