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Method for preparing active nano calcium carbonate at normal temperature and high concentration

A nano-calcium carbonate, high-concentration technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc.

Pending Publication Date: 2021-09-07
襄阳兴发化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inverse relationship between the solubility of calcium hydroxide and calcium carbonate and temperature, this technology can only be produced at low temperature and low concentration (~20°C, ~8%), and some advanced ones can be produced at low temperature and high concentration (~18°C, ~8%) ~10%) to produce more regular nano calcium carbonate

Method used

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  • Method for preparing active nano calcium carbonate at normal temperature and high concentration
  • Method for preparing active nano calcium carbonate at normal temperature and high concentration
  • Method for preparing active nano calcium carbonate at normal temperature and high concentration

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Limestone with a calcium carbonate content of 98.5% is calcined by high temperature radiation to generate CaO and CO 2 Gas, take high-quality quicklime and water at 25°C for digestion reaction to obtain Ca(OH) 2 Slurry, CO 2 The gas is used as the gas source for the carbonization reaction;

[0036] Carbonization: 1.5 cubic meters of calcium hydroxide slurry with a mass concentration of 12% is added to a 2 cubic meter reactor, the initial temperature of carbonization is 28°C, carbon dioxide gas with a volume fraction of 35% is introduced for carbonization, carbonization Add 0.4kg of sucrose, 0.8kg of sodium citrate, and 2.4kg of octadecyl fatty acid (surfactant 1) before and after the start, and then carry out the carbonization reaction until the pH value of the calcium carbonate slurry reaches 7 and the conductivity is the lowest ( 0.4ms / cm) to stop the reaction, control the carbonization time within 50-55min, then add 1.8kg of octadecyl fatty acid sodium salt (surfac...

Embodiment 2

[0039] Limestone with a calcium carbonate content of 98.5% is calcined by high temperature radiation to generate CaO and CO 2 Gas, take high-quality quicklime and water at 25°C for digestion reaction to obtain Ca(OH) 2 Slurry, CO 2 The gas is used as the gas source for the carbonization reaction;

[0040] Carbonization: 1.5 cubic meters of calcium hydroxide slurry with a mass concentration of 14% is added to a 2 cubic meter reactor, the initial temperature of carbonization is 30°C, and carbon dioxide gas with a volume fraction of 35% is introduced for carbonization, carbonization 10 Minutes later, add 0.6kg of sucrose, 0.8kg of sodium citrate, and 2.7kg of octadecyl fatty acid (surfactant 1), and then continue the carbonization reaction until the pH value of the calcium carbonate slurry reaches 7.1 and the minimum conductivity ( 0.4ms / cm), the reaction can be stopped, the carbonization time is controlled within 55-60min, and then 1.4kg of octadecanoic fatty acid sodium salt ...

Embodiment 3

[0043]The method and steps are the same as in Example 2, only in the carbonization step, the mass concentration of the calcium hydroxide slurry is 18%, and the effect of the obtained calcium carbonate is shown in Table 1.

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Abstract

The invention relates to a method for preparing active nano calcium carbonate at normal temperature and high concentration. The carbonization forming principle of calcium carbonate can be researched under the temperature condition of 20-35 DEG C and the calcium hydroxide concentration condition of 8-18%. Meanwhile, the principle of coating calcium carbonate with a surfactant is researched, organic coating is carried out in the calcium carbonate forming period, and the quality and the cost are superior to those of a traditional organic coating process. The nano calcium carbonate produced by the method has the characteristics of cubic shape, primary particle size of 40-60 nm, 80-100 nm and apparent particle size D97 of less than or equal to 9 mum, and is widely applied to the industrial fields of rubber, plastic, silicone rubber and the like as a functional filler.

Description

technical field [0001] The invention relates to a method for preparing active nano-calcium carbonate at normal temperature and high concentration, in particular to a method for preparing nano-calcium carbonate at normal temperature and high concentration. Background technique [0002] China has introduced and produced nano-calcium carbonate products since the 1980s. After decades of development, it has basically formed a nano-calcium carbonate core carbonization technology with high gravity, high shear, and high-speed stirring. However, due to the inverse relationship between the solubility of calcium hydroxide and calcium carbonate and temperature, this technology can only be produced at low temperature and low concentration (~20°C, ~8%), and some advanced ones can be produced at low temperature and high concentration (~18°C, ~8%) ~10%) to produce more regular nano calcium carbonate. [0003] In this context, this method studies the carbonization forming principle of calci...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCC01F11/183B82Y30/00B82Y40/00C01P2004/64C01P2004/03C01P2006/40
Inventor 李鹏路明清孙浩李俊磊王正德刘国义卢晓娅
Owner 襄阳兴发化工有限公司
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