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Preparation method for calcium carbonate whiskers extracted from limestone

A technology for calcium carbonate whiskers and limestone, which is applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve problems such as increasing the production cost of calcium carbonate whiskers, and achieve the effects of convenient regulation and low process cost.

Inactive Publication Date: 2016-10-26
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation raw materials of calcium carbonate are extremely rich, but in order to ensure the purity and quality of the product, the above preparation method mainly uses chemical raw materials or even chemical reagents as the starting point of the process, which undoubtedly increases the production cost of calcium carbonate whiskers to a large extent

Method used

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  • Preparation method for calcium carbonate whiskers extracted from limestone
  • Preparation method for calcium carbonate whiskers extracted from limestone
  • Preparation method for calcium carbonate whiskers extracted from limestone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The specific process and process parameters of calcium carbonate whisker preparation are:

[0035] (1) Crushing and grinding the raw limestone ore, passing through a 75 μm square hole sieve;

[0036] (2) Weigh the silane coupling agent KH550, limestone powder and distilled water respectively according to the mass ratio, wherein KH550: limestone powder: water = 0.015:1:100, and stir evenly until KH550 is completely dissolved to obtain a raw material suspension.

[0037] (3) Place the raw material suspension in a vacuum device, remove the air in the device through vacuum exhaust, quickly open the air valve, and introduce CO 2 Gas, raise the gas pressure to 0.1MPa and keep it constant.

[0038] (4) After reacting for 4 hours, draw the supernatant liquid into the flask, immerse the flask under the liquid level of the constant temperature water bath, set the temperature of the water bath to 80°C, and react for 3 hours under the condition of rapid stirring (speed 1000rpm). ...

Embodiment 2

[0042] The calcium carbonate whiskers were obtained in the steps of Example 1, the difference being that the control temperature of step (4) constant temperature water bath was adjusted to 90°C, the reaction times 1h, stirring speed 10000rpm; other operating steps and conditions were the same. The SEM and XRD analysis of the obtained product showed that the morphology of the product did not change significantly, but the proportion of the aragonite phase decreased and the relative calcite phase increased.

Embodiment 3

[0044] The calcium carbonate whiskers were obtained in the steps of Example 1, the difference being that the control temperature of step (4) constant temperature water bath was adjusted to 60°C, the reaction times 2h, stirring speed 5000rpm; other operating steps and conditions were the same. The SEM and XRD analyzes of the obtained product show that the calcium carbonate whiskers of the product have a diameter of 2-10 μm and a length of 30-50 μm, that is, the size of the whiskers increases, and the purity of the calcium carbonate whiskers is 96.2 wt%.

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Abstract

The invention relates to specifically relates to a preparation method for calcium carbonate whiskers extracted from limestone, belonging to the field of inorganic micropowder. According to the preparation method, natural limestone is subjected to fragmentation and crushing and then mixed with a proper amount of water and a surface modifier, and the calcium carbonate whiskers with structured morphology can be directly obtained through the processes of generation, dissolving, decomposition and crystallization of calcium bicarbonate. The preparation method comprises the following key technical steps: (1) introducing high-pressure CO2 gas into limestone dust suspension with the proper amount of the surface modifier so as to convert calcium carbonate into water-soluble calcium bicarbonate; and (2) controlling decomposition of water-soluble calcium bicarbonate under proper reaction conditions so as to allow the calcium carbonate whiskers mainly of aragonite structures to be precipitated. The preparation method has low requirement on raw materials and completes both purification and crystallization in the process of preparation; and the calcium carbonate whiskers have hydrophobic surfaces, show good dispersibility in matrixes like organic solvents and high-molecular resin and are applicable to the industrialization fields of paint, plastics, polymer composites, etc.

Description

technical field [0001] The invention relates to the field of inorganic ultrafine powders, in particular to a method for preparing calcium carbonate whiskers extracted from limestone. Background technique [0002] Calcium carbonate whisker is a new type of inorganic filler material developed after calcium sulfate whisker. The appearance is white fluffy powdery solid, non-toxic and tasteless, with a large length-to-diameter ratio (>10) and high mechanical strength. It is suitable for coatings , Paper, plastic, rubber, cement concrete and other products can be reinforced and toughened, friction increased and vibration reduced, and thermal stability improved. [0003] Conventional methods for preparing calcium carbonate whiskers mainly include carbonation, metathesis, Ca(HCO 3 ) 2 Preparation method, urea hydrolysis method, etc. During the preparation process, magnesium oxide, ethylene glycol or sodium citrate can be introduced as a crystal form control agent, in order to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/10C30B29/62
CPCC30B7/14C30B29/10C30B29/62
Inventor 佟钰赵立李宛鸿李晓张洺硕
Owner SHENYANG JIANZHU UNIVERSITY
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