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Method for preparing crystal nucleus prefabricated nano calcium carbonate and special equipment

A nano calcium carbonate, crystal nucleus technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, single crystal growth, etc., can solve the problems of large particle size, wide range and narrow distribution of nano calcium carbonate crystals, and achieve Narrow distribution, uniform size and controllable size

Inactive Publication Date: 2005-08-03
上海耀华纳米科技有限公司
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Problems solved by technology

[0004] In order to overcome the existing problem of large particle size and wide range of nano-calcium carbonate crystals, one of the purposes of the present invention is to provide a new technology for preparing nano-calcium carbonate, which can prepare nano-calcium carbonate with small particle size and narrow distribution. ;

Method used

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  • Method for preparing crystal nucleus prefabricated nano calcium carbonate and special equipment
  • Method for preparing crystal nucleus prefabricated nano calcium carbonate and special equipment
  • Method for preparing crystal nucleus prefabricated nano calcium carbonate and special equipment

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Embodiment

[0038] The chemical reactions involved in this system are as follows:

[0039]

[0040]

[0041]

[0042] First, the calcined limestone generates calcium oxide, which is sent to the vibrating quantitative feeder 2 through the lime hopper 1, and then digested into Ca(OH) in the continuous digestion tank 3 2 solution, and then through the gravity separation tank 4 and the 1 μm hydrocyclone 6 to obtain the fine pulp into the storage tank 7, wherein the waste water is discharged to the wastewater treatment center by the liquefied sewage pump 5, and the fine pulp is pumped into the heat exchanger 9 through the thick pulp pump After obtaining the suitable pre-carbonization temperature, enter the adjustment tank 10, and pump it into the crystal nucleus preformer 12 through the thick slurry pump 11, (such as figure 2 Shown) Ca(OH) 2 Slurry from the lower part of the crystal nucleus preformer Ca(OH) 2 The slurry inlet 28 is pumped into the crystal nucleus preform...

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Abstract

The present invention discloses process and apparatus for preparing pre-nucleated nano calcium carbonate. The process includes the following steps: calcining limestone to generate CaO, and slaking to form Ca(OH)2 solution; pumping Ca(OH)2 slurry into pre-nucleating reactor to generate great amount of crystal nuclei; leading the crystal nuclei into sealed carbonizing reactor and introducing CO2 to produce nano calcium carbonate slurry; filtering, and drying to for pre-nucleated nano calcium carbonate. The special apparatus is the pre-nucleating reactor, which is cylindrical and has partition board to separate into upper and lower layers and spherical porous stuffing in the upper layer. The pre-nucleating technology results in greatly raised carbonizing efficiency and makes it possible to obtain nanometer calcium carbonate crystal with small particle size and narrow size distribution.

Description

technical field [0001] The invention proposes a new technology for preparing nano-calcium carbonate, the innovation point of which is that the two stages of crystal nucleation and growth can be separated, making it possible to prepare ultra-fine and nano-sized calcium carbonate. Background technique [0002] At present, nano light calcium carbonate is mainly composed of three main reaction structural units: calcium carbonate ore decomposition, lime digestion and slaked lime carbonization. In the preparation process of calcium carbonate, the reaction structure unit that mainly affects the crystal shape and size of the product is the carbonization reaction of hydrated lime. The carbonization process is also the formation process of nano-scale calcium carbonate. Calcium carbonate is a hexagonal crystal system. The process includes crystal nucleation and crystal growth. [0003] For a long time, there has always been the concept that the nucleation and growth of crystals are in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C30B29/10
Inventor 颜培刚黎绍北张华王玉香
Owner 上海耀华纳米科技有限公司
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