Preparation method of high length-diameter ratio calcium carbonate whiskers

A calcium carbonate whisker, high aspect ratio technology, applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, single crystal growth, etc. The effect of cost and reaction raw materials are cheap and easy to obtain

Inactive Publication Date: 2011-01-05
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japan, Europe and America to CaCO 3 The research and development of whiskers are relatively in-depth and extensive; domestic ultra-fine CaCO 3 There are many studies and applications on particles, but for CaCO which also has a good application prospect 3 There are not many studies on whiskers, and there are very few reports on industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 A kind of preparation method of high aspect ratio calcium carbonate whisker comprises the following steps:

[0014] (1) After the magnesium chloride solution prepared by bischofite adopts WLW-100 vacuum pump (pumping speed 100L / S, rotating speed 350r / min) to filter, pump it into two reaction kettles (Shandong Zibo Huaxing Chemical Equipment Factory), and then Add the digested and desanded lime slurry in the reaction kettle while stirring, so that the mass concentration of the magnesium chloride solution in the prepared reaction solution is 3.8%, and the mass concentration of the lime slurry is 0.7%; the reaction kettle is heated to 70°C React for 0.5h, then with 1.6m 3 The flow rate of / h is passed into CO 2 , the reaction was stirred at this temperature, and when the pH of the reaction solution was 7, the CO 2 The access of the calcium carbonate whisker and the mother liquor A of the first stage are obtained.

[0015] The lime slurry that has been diges...

Embodiment 2

[0019] A kind of preparation method of embodiment 2 calcium carbonate whiskers with high aspect ratio, comprises the following steps:

[0020] (1) After the magnesium chloride solution prepared by bischofite is vacuum-filtered, pump it into the reaction kettle, then add the digested and desanded lime slurry while stirring in the reaction kettle, so that the magnesium chloride in the prepared reaction solution The mass concentration of the solution is 6.7%, and the mass concentration of the lime slurry is 2.4%; the reaction kettle is heated to 90°C for 1.0h, and then the 3 The flow rate of / h is passed into CO 2 , the reaction was stirred at this temperature, and when the pH of the reaction solution was 7, the CO 2 The access of the calcium carbonate whisker and the mother liquor A of the first stage are obtained.

[0021] (2) in the calcium carbonate whisker of the first stage and mother liquor A, stir and add the lime slurry that has digested desanding, make the mass concen...

Embodiment 3

[0024] Embodiment 3 A kind of preparation method of high aspect ratio calcium carbonate whisker, comprises the following steps:

[0025] (1) After vacuum filtration, the magnesium chloride solution prepared with bischofite is pumped into two reaction kettles, and then the digested and desanded lime slurry is added while stirring in the reaction kettle to make the prepared reaction solution The mass concentration of the magnesium chloride solution in the medium is 5.0%, and the mass concentration of the lime slurry is 1.5%; the reaction kettle is heated up to 80°C for 0.8h, and then the 3 The flow rate of / h is passed into CO 2 , the reaction was stirred at this temperature, and when the pH of the reaction solution was 7, the CO 2 The access of the calcium carbonate whisker and the mother liquor A of the first stage are obtained.

[0026] (2) in the calcium carbonate whisker of the first stage and mother liquor A, stir and add the lime slurry that has digested desanding, make...

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Abstract

The invention relates to a preparation method of high length-diameter ratio calcium carbonate whiskers. In the method, quicklime is used as a raw material, bischofite is used as a crystal type control agent, the calcium carbonate whiskers are prepared through the carbonation of carbon dioxide, and then mother liquid is recycled to prepare the calcium carbonate whiskers, so the multi-level growth of a high length-diameter ratio calcium carbonate whisker product is finished. The preparation method has a simple, low-cost and easily-available raw material, and increases the length-diameter ratio of the whiskers through the multi-level growth of the whiskers, thereby not only increasing the yield of the whiskers and reducing the cost, but also being capable of realizing scale industrial production.

Description

technical field [0001] The invention relates to the technical field of inorganic salt materials, in particular to a method for preparing calcium carbonate whiskers with high aspect ratio. Background technique [0002] Calcium carbonate whiskers are non-toxic, odorless, white fluffy solids, and are another new type of inorganic filler after nano-calcium carbonate. Calcium carbonate whiskers filled into rubber can obtain higher tensile strength, abrasion resistance, and tensile strength than pure rubber vulcanizate, and have a significant reinforcing effect in natural rubber and synthetic rubber, and can adjust the consistency at the same time. Calcium carbonate whiskers can act as a skeleton in plastic products, which has a great effect on the dimensional stability of plastic products, can improve the hardness of products, and can also improve the surface gloss and surface smoothness of products. Adding calcium carbonate whiskers to general plastic products can improve heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/14C30B29/22C30B29/62C01F11/18
Inventor 乃学瑛余德成李武叶其详魏明
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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