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Industrial preparation of calcium carbonate nano bead string

A calcium carbonate, nano technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve problems such as unfavorable industrial production, complicated process operation, etc.

Inactive Publication Date: 2009-07-08
山东海泽纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the prepared precipitated calcium carbonate is between 10-100nm, and the aspect ratio is 10-30, but because the preparation process adopts a two-step method, the process operation is relatively complicated, which is not conducive to industrial production

Method used

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  • Industrial preparation of calcium carbonate nano bead string
  • Industrial preparation of calcium carbonate nano bead string
  • Industrial preparation of calcium carbonate nano bead string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] CaCO 3 The content is 96%, MgCO 3 The natural limestone with a content of 0.7% is crushed and calcined, digested with hot water at 60°C, passed through a 250-mesh sieve, and diluted with water to prepare a refined calcium hydroxide feed liquid. The refined calcium hydroxide feed liquid is The concentration is 80 g / l.

[0020] to 20m 3 Add 14m to the reactor 3 Concentration above-mentioned calcium hydroxide slurry, then add 10 kilograms of sodium pyrophosphate, pass into the kiln gas that contains carbon dioxide and be 25% (volume concentration) and carry out carbonization, the flow rate of kiln gas is controlled at 650m 3 / h, the reaction temperature of the whole carbonization process shall not be higher than 40°C. When the carbonization reaches 8 to a pH value, add 8 kilograms of sodium lauryl sulfate and continue the carbonization until the reaction ends to obtain a uniformly dispersed calcium carbonate slurry for use, and the whole reaction is no more than 3 hour...

Embodiment 2

[0023] CaCO 3 The content is 96%, MgCO 3 The natural limestone content is 0.7%. After crushing and calcining, add hot water at 70°C for digestion, pass through a 250-mesh sieve, and dilute with water to prepare a refined calcium hydroxide feed liquid. The refined calcium hydroxide feed liquid is The concentration is 70 g / l.

[0024] to 20m 3 Add 12m to the reactor 3 Above-mentioned calcium hydroxide slurry, then add 20 kilograms of sodium pyrophosphates, pass into the kiln gas that contains carbon dioxide and be 25% (volume concentration) and carry out carbonization, the flow rate of kiln gas is controlled at 800m 3 / h, the reaction temperature of the whole carbonization process shall not be higher than 40°C. Carbon dioxide is passed through to carbonization until the end of the reaction to obtain a uniformly dispersed calcium carbonate slurry for use, and the whole reaction is no more than 3 hours.

[0025] The calcium carbonate slurry is filtered, dried at 150°C, and cr...

Embodiment 3

[0027] CaCO 3 The content is 96%, MgCO 3 The natural limestone with a content of 0.7% is crushed and calcined, digested with hot water at 60°C, passed through a 250-mesh sieve, and diluted with water to prepare a refined calcium hydroxide feed liquid. The refined calcium hydroxide feed liquid is The concentration is 80 g / l.

[0028] to 20m 3 Add 14m to the reactor 3 Above-mentioned calcium hydroxide slurry, add 40 kilograms of sodium pyrophosphates, pass into the kiln gas that contains carbon dioxide and be 40% (volume concentration) and carry out carbonization, the flow rate of kiln gas is controlled at 800m 3 / h, the reaction temperature of the whole carbonization process shall not be higher than 40°C. When the carbonization reaches 8 to the pH value, add 5 kilograms of sodium dodecylsulfonate and continue the carbonization to the end of the reaction to obtain a uniformly dispersed calcium carbonate slurry for use, and the whole reaction is no more than 3 hours.

[0029...

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Abstract

The invention discloses an industrial preparation method for calcium carbonate nanometer beads, which is an industrial preparation method for nanometer calcium carbonate with a bead-shaped structure, and comprises the following steps that: (1) natural limestone is crushed and calcined, then is added with hot water for digestion, and passes through a sieve for refining to be prepared into a refined calcium hydroxide material liquid; (2) the calcium hydroxide slurry is sent into a reactor system, proper kiln gas is aerated for carbonization reaction, the concentration of carbon dioxide in the kiln gas is between 10 and 50 percent, and a crystal control agent composition A and a crystal control agent composition B are added before the carbonization or at an initial carbonization stage; and (3) an obtained product is filtered, dried and crushed to obtain the bead-shaped nanometer calcium carbonate. The diameter of the bead-shaped nanometer calcium carbonate is between 20 and 50nm, the slenderness ratio is between 10 and 30, and the BET specific surface area is larger than 30m / g. The bead-shaped nanometer calcium carbonate has good dispersivity, improves the mechanical property of materials, and improves the barrier property of the materials to various gases and liquids, so the bead-shaped nanometer calcium carbonate can be widely applied to industries such as rubber, plastic, coating, printing ink, paper making, sealing gum and the like.

Description

technical field [0001] The invention relates to an industrial preparation method for producing nanoscale precipitated calcium carbonate with a beaded structure. Background technique [0002] Nano-calcium carbonate material refers to ultra-fine powder calcium carbonate with a particle size of 1-100nm. Due to the ultra-fineness of nano-calcium carbonate particles, their crystal structure and surface electronic structure change. A large number of studies have shown that there is a large distortion stress in its microcrystalline structure, which produces quantum size effects and surface effects that ordinary light calcium carbonate does not have, making it comparable to conventional materials in terms of mechanics, light and heat resistance, and melting point. Show superior performance. However, as an inorganic functional material with a nanoscale structure, due to the different interface properties between itself and the organic polymer material matrix and the large surface e...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 李振东王开军王玉艳王功波陈祥芝徐西庆赵勇徐铸德
Owner 山东海泽纳米材料有限公司
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