Carbonizer and method for producing nano calcium carbonate

A nano-calcium carbonate and carbonizer technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve problems such as long reaction time, product fluctuation, and irregular crystal structure of products, and achieve regular crystal structure and particle size distribution Uniform and stable product quality

Active Publication Date: 2013-08-28
连州市凯恩斯纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deficiencies of these two carbonization methods are as follows: 1) the crystal structure of the produced product is irregular, and the particle size distribution range of the product produced in the same batch is wide; 2) the reaction time is long, and the utilization rate of carbon dioxide is low; 3) it is difficult to realize the The whole monitoring of the carbonization process is difficult to achieve automatic control; 4) The nucleation and growth stages of calcium carbonate are in the middle of the carbonization reaction, so it is difficult to control the particle size of calcium carbonate, resulting in product fluctuations.

Method used

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  • Carbonizer and method for producing nano calcium carbonate
  • Carbonizer and method for producing nano calcium carbonate
  • Carbonizer and method for producing nano calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Adjust the calcium hydroxide slurry with a calcium hydroxide mass concentration of 6% to 15% in the calcium hydroxide blending pool, store the calcium hydroxide slurry in the calcium hydroxide slurry storage pool after deployment, The temperature of the calcium hydroxide slurry in it is controlled between 10°C and 30°C, and the crystal form directing agent magnesium chloride, magnesium sulfate, and sodium silicate are added at a mass percentage of 0.1% to 2% on the dry basis of calcium hydroxide. For one of them, add 0.1 to 2% sodium hexametaphosphate as a dispersant, mix and stir evenly, and then pump calcium hydroxide slurry into the primary carbonization nucleation reactor, and pass into the primary carbonization nucleation reactor. carbon dioxide gas, the volume concentration of carbon dioxide is ≥ 20%, and the carbon dioxide gas introduced is continuously contacted and reacted with the slurry in the slurry carbonization reaction tube.

[0065] The reaction rate is ...

Embodiment 2

[0070] In the calcium hydroxide blending pool, adjust the calcium hydroxide slurry with a calcium hydroxide mass concentration of 5% to 10%, and store the calcium hydroxide slurry in the calcium hydroxide slurry storage pool after blending. Control the temperature of the calcium hydroxide slurry in the calcium hydroxide slurry storage tank between 10°C and 30°C, and add 0.4% of the crystal form directing agent magnesium chloride and magnesium sulfate based on the dry basis of calcium hydroxide , sodium silicate, add 0.2-2% sodium hexametaphosphate as a dispersant, mix and stir evenly, pump calcium hydroxide slurry into the primary carbonization nucleation reactor, and pump it into the primary carbonization nucleation reactor The carbon dioxide gas that has been purified is passed into the middle, the volume concentration of carbon dioxide is ≥ 20%, and the carbon dioxide gas passed in is continuously contacted and reacted with the slurry in the slurry carbonization reaction tub...

Embodiment 3

[0076] In the calcium hydroxide blending pool, adjust the calcium hydroxide slurry with a calcium hydroxide mass concentration of 5% to 10%, and store the calcium hydroxide slurry in the calcium hydroxide slurry storage pool after blending. Control the temperature of the calcium hydroxide slurry in the calcium hydroxide slurry storage tank between 20°C and 40°C, and add 0.3% of the crystal form directing agent magnesium chloride and magnesium sulfate based on the dry basis of calcium hydroxide , one of sodium silicate and 0.2-2% sodium hexametaphosphate as a dispersant, after mixing and stirring evenly, pump calcium hydroxide slurry into the primary carbonization nucleation reactor, and pass through the primary carbonation nucleation reactor The carbon dioxide gas that has been purified is introduced, and the volume concentration of carbon dioxide is ≥ 20%. The carbon dioxide gas introduced is continuously contacted and reacted with the slurry in the slurry carbonization reacti...

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Abstract

The invention discloses a carbonizer for producing nano calcium carbonate. The carbonizer comprises a calcium hydroxide blending tank, a calcium hydroxide slurry storage tank, a primary carbonization nucleation reactor, a primary carbonization growth reactor, a primary carbonization ageing tank, a secondary carbonization tubular reactor and a calcium hydroxide activating tank; and a slurry carbonization reaction tube and a carbon dioxide porous reaction tube which have two-end uninterrupted repeated arch structures are arranged in the primary carbonization nucleation reactor, the primary carbonization growth reactor and the secondary carbonization tubular reactor respectively. By the method for producing the nano calcium carbonate through the carbonizer, the calcium carbonate can be produced by the nucleation stage and the growth stage, and is controlled stepwise, the reaction degree of the whole carbonization process can be monitored, the nano calcium carbonate with uniform particle size distribution, regular crystal structures and stable quality can be produced, and the invention has the advantages of small equipment investment, short carbonization time, low energy consumption and the like.

Description

technical field [0001] The invention relates to a device for producing nano-calcium carbonate, in particular to a novel carbonization reactor and method for continuously producing nano-calcium carbonate. Background technique [0002] The carbonization reaction is carried out in a gas, liquid, and solid three-phase reaction system, which involves the dissolution of calcium hydroxide solids, the absorption of carbon dioxide gas, the precipitation of calcium carbonate, and the nucleation and growth of calcium carbonate particles. "Carbonization method" is a method commonly used in the preparation of calcium carbonate at home and abroad, and the carbonization process of calcium hydroxide and carbon dioxide reaction is the most critical step. At present, there are four mature carbonization methods at home and abroad: intermittent bubbling carbonization, intermittent stirring carbonization, continuous spray carbonization and intermittent high gravity carbonization. Among them, fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 潘志婷晏华中熊维湘刘琼艳廖权甘洁媛马跃东
Owner 连州市凯恩斯纳米材料有限公司
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