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Carbonation reaction method of nano calcium carbonate

A nano-calcium carbonate and carbonation technology, applied in the field of chemical engineering, can solve the problems of complex design of high-gravity synthesizers, limited industrial applications, and high operating costs, and achieve the effects of small investment, stable product quality, and fully dispersed mass transfer.

Active Publication Date: 2015-06-03
GUANGXI SHANDONGLAI CHEM IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hypergravity synthesizer has disadvantages such as complex design, large equipment investment, high operating cost, and utilization rate of reaction gas, which greatly limits its industrial application.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, a stainless steel structure reactor with a height-diameter ratio of 3:1 is used. During the carbonation reaction of calcium carbonate, the discharge valve is closed, the feed valve is opened, and the Ca(OH) 2 The slurry with a solid content of 8.5±0.5% and a temperature of 20°C was added to the reaction kettle; the multi-layer propeller agitator and the disc saw-tooth agitator were activated, the air inlet valve was opened, and a kiln containing carbon dioxide with a volume concentration of 30±2% was passed into the kiln. In the initial stage of carbonization, the rotating speed of the multi-layer propeller agitator was controlled to be 200 r / min, and the rotational speed of the disc saw tooth agitator was 400 r / min. The rotating speed of the disc saw tooth stirrer is 350r / min. When the pH of the reaction system reaches 2 / g, the particle size is about 78nm, the shape is quasi-cubic and the powder is well dispersed. Compared with the preparation of ...

Embodiment 2

[0026] In this embodiment, a stainless steel structure reactor with a height-diameter ratio of 4:1 is used. During the carbonation reaction of calcium carbonate, the discharge valve is closed, the feed valve is opened, and the Ca(OH) 2 The slurry with a solid content of 9.0±0.5% and a temperature of 22°C was added to the reaction kettle; the multi-layer propeller agitator and the disc saw-tooth agitator were started, the air inlet valve was opened, and the kiln containing carbon dioxide with a volume concentration of 30±2% was passed into the kiln At the initial stage of carbonization, the rotating speed of the multi-layer propeller agitator was controlled to be 250 r / min, and the rotational speed of the disc saw tooth agitator was 500 r / min. The rotating speed of the disc saw tooth stirrer is 400r / min. When the pH of the reaction system reaches 2 / g, the particle size is about 60nm, the shape is like cubic regular, and the powder is well dispersed. Compared with the preparat...

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Abstract

The invention discloses a carbonation reaction method of nano calcium carbonate, which comprises the following steps: in the carbonation reaction of nano calcium carbonate, closing a discharge valve, opening a feed valve, and adding slurry having a Ca(OH)2 solid content of 8.5+ / -0.5% and a temperature of 20 DEG C into a reaction kettle, wherein the reaction kettle is provided with a multi-layer propeller type stirrer and a disc serration type stirrer and has a height-diameter ratio of (2.5-4.5):1; and starting the multi-layer propeller type stirrer and the disc serration type stirrer, opening a gas inlet valve, and introducing kiln gas containing carbon dioxide gas until the pH value of the reaction system is less than 7.0, thus obtaining the nano calcium carbonate slurry. According to the invention, the disc serration type stirrer and the carbon dioxide gas simultaneously participate in the stirring of the slurry, so that the mass transfer action is enhanced, and the slurry is easy to form macroscopic circulation, thereby improving the utilization ratio of the carbon dioxide gas; the method is low in equipment investment and energy consumption, and is easy to operate and control; and under the thorough action of microscopic mixing and macroscopic mixing, the reaction uniformity of the system is ensured, and the produced nano calcium carbonate is short in reaction time and stable in product quality.

Description

Technical field: [0001] The invention belongs to the technical field of chemical engineering, and relates to a carbonation reaction method of nanometer calcium carbonate. Background technique: [0002] Calcium carbonate is a white, non-toxic and important inorganic powder material. With the progress of calcium carbonate miniaturization and surface treatment, calcium carbonate products have developed from a single filling type to specialization, refinement and functionalization, and people's demand for micronized calcium carbonate is also increasing. Due to its small particle size, high specific surface area and special surface treatment, nano-calcium carbonate has superior properties that ordinary calcium carbonate cannot match. Nano calcium carbonate is widely used in plastics, rubber, viscose, paint and ink and other fields. [0003] At present, the method for preparing nano-scale calcium carbonate at home and abroad is mainly carbonization. It uses high-quality limesto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 朱勇王权广颜干才龙小娥韦官文
Owner GUANGXI SHANDONGLAI CHEM IND TECH CO LTD
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