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Preparation method of micrometer spindle composite nano-calcium carbonate

A nano-calcium carbonate, spindle technology, applied in the direction of calcium carbonate/strontium/barium, can solve the problems of unsatisfactory application of nano-scale activated calcium carbonate, and achieve excellent dispersibility, high surface energy and activity, and broad application prospects. Effect

Active Publication Date: 2013-11-06
CHANGZHOU CALCIUM CARBONATE
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Problems solved by technology

[0004] In order to overcome the unsatisfactory application of existing nano-scale active calcium carbonate in plastic products and rubber products, the present invention provides a preparation method of micro-spindle composite nano-calcium carbonate

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  • Preparation method of micrometer spindle composite nano-calcium carbonate
  • Preparation method of micrometer spindle composite nano-calcium carbonate
  • Preparation method of micrometer spindle composite nano-calcium carbonate

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Embodiment Construction

[0022] Such as figure 1 It is a transmission electron microscope photo, a preparation method of micro-spindle composite nano-calcium carbonate, which is to carry 50-60 nanometer cubic calcium carbonate particles on 1-3 micron spindle-shaped precipitated calcium carbonate large particles. The powder has the excellent dispersibility of micron-sized powder and the high surface energy and activity of nano-powder.

[0023] Manufacturing steps and process requirements of the present invention:

[0024] 1. Prepare a calcium hydroxide suspension with a concentration of 20% (mass percentage concentration of calcium hydroxide). To prepare 20% and 10% calcium hydroxide suspensions, impurities must be removed.

[0025] 2. Cool down the 20% calcium hydroxide suspension to 40 degrees Celsius, plus or minus 2 degrees Celsius.

[0026] 3. Prepare the carbon dioxide concentration within 28%-35% by volume.

[0027] 4. Inject the prepared carbon dioxide gas into the calcium hydroxide suspens...

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Abstract

The invention relates to the technical field of inorganic composite powder, in particular to a preparation method of micrometer spindle composite nano-calcium carbonate. The method comprises the following steps of: a, preparing a calcium hydroxide suspension; b, cooling the calcium hydroxide suspension to 38-42 DEG C; c, injecting prepared carbon dioxide gas into the calcium hydroxide suspension; d, transferring calcium carbonate suspension into an aging tank; e, cooling the aged calcium carbonate suspension to 30 DEG C; f, injecting the cooled calcium carbonate suspension into a stirred carbonation reactor; g, injecting the calcium hydroxide suspension into the stirred carbonation reactor filled with the calcium carbonate suspension again; h, adding a crystallization control agent; i, injecting carbon dioxide with the concentration of 28-35% into the carbonation reactor; and j, dehydrating the slurry and drying to obtain composite powder. The micrometer spindle composite nano-calcium carbonate has both the favorable dispersibility of micropowder and the high surface energy and activity of nanopowder.

Description

technical field [0001] The invention relates to the technical field of manufacturing inorganic composite powders, in particular to a method for preparing micro-spindle composite nano-calcium carbonate. Background technique [0002] The calcium carbonate particles produced by ordinary precipitation method are spindle-shaped, with a particle size (major axis) of 1-3 microns. Although the dispersion is good, it can only be used as a filler for rubber and plastic products. [0003] Due to its good mechanical properties, nano-scale activated calcium carbonate has been widely used in plastisol and silicone rubber, but it is not ideal for plastic products and rubber products. The reason for affecting its application is that due to the The surface energy is high and the agglomeration is serious, but the current plastic and rubber processing production lines cannot uniformly disperse and mix the powder of nano-scale active calcium carbonate in the resin. The powder is compounded by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 黄海平吴荣忠宗永波邓敏杰
Owner CHANGZHOU CALCIUM CARBONATE