Method for producing industrial precipitation-type nano calcium carbonate

A nano-calcium carbonate, production method technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of unstable quality, large particle size of nano-calcium carbonate, agglomeration, etc., to avoid environmental pollution problems, The effect of reducing consumption and stable quality

Inactive Publication Date: 2015-04-29
安徽雪城超细碳酸钙有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This technology helps recover and reuse CO2 from combustion exhaust gases without causing harm or contamination issues for people who use it. It produces nanosized calcium carbons that have small sizes, making them ideal materials used in various applications like catalyst supports.

Problems solved by technology

The technical problem addressed by this patented technology relates to improving the stability or control over nanoparticle sizes during synthesis processes involving calcite particles (CaCOs). Current methods involve creating fine crystals from finely ground CaC2) followed by grinding them down until they are smaller than 100 mesh diameter. This process leads to poorly controlled results due to aggregations caused by larger particles.

Method used

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Embodiment Construction

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0018] A kind of production method of industrial precipitation type nano-calcium carbonate, comprises the steps:

[0019] (1) First place limestone with a calcium carbonate content greater than 80% and a particle size of 30-50mm in a dryer, then heat up to 105-110°C and dry for 2 hours;

[0020] (2) Put the dried limestone into the rotary kiln, preheat it through the preheater and heat it up for calcination. The maximum temperature of calcination is 1100-1200°C. After calcination, it will be cooled by cooler. When the temperature drops below 100°C Unload the generated calcium oxide;

[0021] (3) The flue gas discharged from the rotary kiln is sent to the washing tower through the induced draft fan, and the gas enters the steam-water separato...

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Abstract

The invention discloses a method for producing industrial precipitation-type nano calcium carbonate and relates to the technical field of nano calcium carbonate. The method comprises the following steps: drying limestone, calcining the limestone in a rotary kiln, and hydrolyzing calcined calcium oxide to generate calcium hydroxide solution; introducing the recycled carbon dioxide gas, finally dehydrating and drying, thereby obtaining the nano calcium carbonate. According to the method, the carbon dioxide gas in the calcined flue gas is recycled, and the problem of environmental pollution caused by direct emission is solved; the generation speed of the calcium carbonate is controlled by regulating the flow of carbon dioxide, so that the nano calcium carbonate with narrow particle size range is prepared. Therefore, the consumption of the carbon dioxide can be reduced, and the prepared nano calcium carbonate has the characteristics of stable quality and high purity.

Description

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Claims

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Application Information

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Owner 安徽雪城超细碳酸钙有限公司
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