Method for preparing nanometer calcium carbonate granule

A technology of nano-calcium carbonate and particles, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of unstable operation, high energy consumption, uneven particle size, etc., and achieve high CO2 utilization rate, low energy consumption, and mixing speed uniform effect

Active Publication Date: 2006-05-10
山东海泽纳米材料有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

[0013] The object of the present invention is to provide a kind of method for efficiently mixing and preparing nano-calcium carbonate particles for the shortcomings such as inhomogeneous particle size, high energy consumption, and unstable operation that exist in the existing nano-calcium carbonate preparation method, the method comprising the following steps:

Method used

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  • Method for preparing nanometer calcium carbonate granule
  • Method for preparing nanometer calcium carbonate granule

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Experimental program
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Effect test

Embodiment 1

[0036] The dispersion medium is a nickel film with a pore size of 0.2 μm, and the effective film area is 12.5 mm 2 , CO 2 Mixed gas with nitrogen (CO 2 Volumetric concentration is 30%) enters reactor 4 with the flow rate of 50ml / min, Ca(OH) 2 The initial solid concentration in the suspension is 2g / 100ml water, the flow velocity of the suspension on the surface of the dispersion medium 4 is 0.3m / s, the residence time in the reactor is 0.3s, and the reaction temperature is 15°C. , transmission electron microscope photos show that the diameter of the generated nano-calcium carbonate particles is 20nm, the shape is cube, CO 2 The utilization rate is 83.7%.

Embodiment 2

[0038] The dispersion medium is a stainless steel membrane with a pore size of 5 μm, and the effective membrane area is 12.5mm 2 , CO 2 Mixed gas with nitrogen (CO 2 Volumetric concentration is 30%) enters reactor 4 with the flow rate of 50ml / min, Ca(OH) 2 The initial solid concentration in the suspension is 2g / 100ml of water, the flow velocity of the suspension on the surface of the dispersion medium 4 is 0.5m / s, the residence time in the reactor is 0.3s, and the reaction temperature is 15°C. , the transmission electron microscope photos show that the diameter of the generated nano-calcium carbonate particles is 33nm, the shape is a cube, CO 2 Utilization rate 81.2%

Embodiment 3

[0040] The dispersion medium is a stainless steel membrane with a pore size of 5 μm, and the effective membrane area is 12.5mm 2 , pure CO 2 Enter reactor 4 with a flow rate of 50ml / min, Ca(OH) 2 The initial solid concentration in the suspension is 2g / 100ml of water, the flow velocity of the suspension on the surface of the dispersion medium 4 is 0.5m / s, the residence time in the reactor is 0.3s, and the reaction temperature is 15°C. , the transmission electron microscope photos show that the diameter of the generated nano-calcium carbonate particles is 53nm, the shape is a cube, CO 2 The utilization rate is 80.3%.

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Abstract

The invention relates to a method for preparation of nano calcium carbonate particles by highly effective mixture, belonging to the art of preparation of nano particles. Preparing Ca(OH)2 suspension in a container; fixing dispersion medium in the container and venting reacting gas in; pumping the prepared Ca(OH)2 suspension into reactor by a pump to react, and dropping until PH decreases to 7, the reaction finishes and the nano calcium carbonate particles are prepared; the gas-liquid mixture prepared after the reaction returns to the container to be used cyclically. The merit of the invention is characterized in that the mixture speed is rapid and uniform, the grain size and shape are controllable, the usage ratio of CO2 is high and can reach more than 50%, the operation energy-consumption is low, and the stability is high; the grain size of prepared nano calcium carbonate is about 20nm, the shape is cube-type. And it has good prospect in preparation of nano calcium carbonate.

Description

technical field [0001] The invention relates to a method for preparing nano calcium carbonate particles, in particular to a method for realizing high-efficiency mixing to prepare nano calcium carbonate particles, and belongs to the technical field of nano particle preparation methods. Background technique [0002] Nanoscale calcium carbonate is a new type of ultrafine solid material developed in the 1980s. Due to the ultra-fineness of nano-scale calcium carbonate particles, its crystal structure and surface electronic structure have undergone great changes, resulting in quantum size effects, small size effects, surface effects, and macroscopic quantum effects that ordinary calcium carbonate does not have. Catalyst, photothermal resistance and melting point show superior performance compared with conventional materials, and are widely used in many industries such as rubber, plastics, papermaking, coatings, inks, and medicine. Therefore, nano-calcium carbonate has shown wide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 骆广生陈祥芝王玉军陈桂光王凯陈绪奎杜磊徐建鸿
Owner 山东海泽纳米材料有限公司
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