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Preparation method of nanometer grade active calcium carbonate special for sealing material

A technology of active calcium carbonate and sealing materials, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of thixotropic deterioration, unavoidable agglomeration, and low thixotropic performance of sealing materials, and achieve reduced production costs, narrow particle size distribution, less reunion effect

Inactive Publication Date: 2006-07-26
内蒙古蒙西纳米材料有限责任公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the production process of this invention has certain advantages, the primary average particle size of the ultrafine calcium carbonate product produced by this technology is greater than 100nm. The disadvantage of large particles is that the purpose of increment can be achieved, but the thixotropy of the sealing material is deteriorated. Therefore, the application in sealing materials is limited
At the same time, the particle size uniformity of the nano-scale calcium carbonate particles less than 100nm produced by this technology is poor, and there are defects in crystallization. Even if organic matter is used for surface treatment, it is inevitable to agglomerate, and poor dispersion causes problems such as low strength and thixotropic performance of the sealing material. To avoid agglomeration, special surface active treatment is necessary

Method used

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  • Preparation method of nanometer grade active calcium carbonate special for sealing material
  • Preparation method of nanometer grade active calcium carbonate special for sealing material
  • Preparation method of nanometer grade active calcium carbonate special for sealing material

Examples

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Embodiment 1

[0019] First of all, raw material preparation is carried out, and medium-burned quicklime is selected. The magnesium oxide index is required to be less than 1.5%, and the activity index is required to be greater than 400mL / 10min. The production process is as follows: figure 1 As shown, the process is as follows:

[0020] In the first step, hot water at 50°C is added to the quicklime, and the water and quicklime are hydrated in the drum digester at a ratio of 6:1 to produce coarse lime milk, which passes through a coarse screen and two-stage 200-mesh screens Refined by filtration, aged in the aging tank for 12 hours and then pumped into the slurry tank to prepare refined milk of lime with a mass concentration of 8%;

[0021] In the second step, CaCO is added to the milk of lime refined in the first step 3 Calcium citrate with a solid content of 0.1%, and stirred evenly, was metered and pumped into the carbonization reactor for stirring, and started circulating cooling to contr...

Embodiment 2

[0030] Under the process condition of above-mentioned embodiment one, changed some process conditions wherein, the parameter of change is:

[0031] Step 1: the temperature of the water, which is 65°C; the mass concentration of the refined milk of lime is 10%;

[0032] Step 2: the addition of calcium citrate is 1%, and the temperature is controlled at about 20°C;

[0033] Step 3: continue to carbonize the pH to 7.0;

[0034] Step 4: the cooked pulp after carbonization was matured for 15 hours, injected with 4% surfactant of calcium carbonate solid content in the slurry, and stirred for 1 hour;

[0035] Step 5: Dry until the moisture content meets customer requirements.

[0036] The calcium carbonate product produced by the above process has complete primary particle crystallization, an average particle size of 40-60nm, less secondary particle agglomeration, and narrow particle size distribution; the crystal form of calcium carbonate is cubic, which is used in sealing material...

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Abstract

The invention relates to a preparation method for nano active CaCO3 as special sealing material, which comprises: preparing lime milk, adding control agent for crystal system, taking carbonization reaction, activating the slurry, separating the solid from liquid to dry, smash, depolymerize, grade, screen and pack; finally, obtaining the product. Wherein, the product has 40~60nm size, cubic crystal system, and more than 25m2 / g BET specific surface area. This invention is convenient to control the technical parameters, has stable quality, and can complete replace the gas-phase white carbon black and imported SiO2 to reduce cost and bring great economic benefit.

Description

technical field [0001] The invention relates to a preparation method of nanoscale calcium carbonate, in particular to a preparation method of special nanoscale active calcium carbonate for sealing materials. Background technique [0002] At present, there are many ways to produce ultra-fine calcium carbonate, such as calcium hydroxide is obtained by hydration of calcium oxide, and then calcium carbonate is obtained by the reaction of calcium hydroxide and carbon dioxide. However, due to the different production process routes, the grain shape and particle size of the crystals are different, and their application properties and uses are also different. [0003] The name of the invention disclosed by the China Intellectual Property Office on June 29, 2005 is "A Superfine Activated Calcium Carbonate and Its Preparation Process and Application", and the patent application number is: 200410084715.6. The two steps of modification are carried out at the same time. The shape of cal...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 赵全胜蒙昊贾海军李淑振吴扎拉森
Owner 内蒙古蒙西纳米材料有限责任公司
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