Rodlike aragonite calcium carbonate preparation method

An aragonite-type, calcium carbonate technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problems of high cost, low production efficiency, high energy consumption, etc. High temperature resistant elastic modulus, high production efficiency and large specific surface area

Active Publication Date: 2017-02-22
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the solid content of calcium hydroxide in the lime slurry is too low in this method, and production efficiency is not high, MgCl 2 The consumption is large and recycling is difficult, and the post-processing process of the product is complicated
[0005] In summary, the current preparation of rod-shaped aragonite calcium carbonate has disadvantages such as low production efficiency, high energy consumption, high cost, difficult recovery of treatment agents, and difficulty in controlling the crystal form and morphology of the product.

Method used

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  • Rodlike aragonite calcium carbonate preparation method
  • Rodlike aragonite calcium carbonate preparation method
  • Rodlike aragonite calcium carbonate preparation method

Examples

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Effect test

Embodiment 1

[0041] A preparation method of rod-shaped aragonite calcium carbonate, comprising the following steps:

[0042] (1) Crushing the limestone, calcining at a temperature of 900°C for 6 hours, then digesting the calcined limestone with a gray-to-water mass ratio of 1:4, and controlling the water temperature to 28°C to obtain lime slurry;

[0043] (2) Pass the lime slurry obtained in step (1) through an 80-mesh sieve, filter to remove slag, add water to adjust the solid content of the lime slurry to 10%, and obtain refined lime slurry for subsequent use;

[0044] (3) Control the temperature of the refined lime slurry at 55~60°C, add calcium hydroxide in the lime slurry with a mass of 0.3% glutaric acid, 0.5% barium sulfate and 0.1% polyethylene glycol as crystal form control agents, and then transport Into the carbonization tower, adjust the stirring rate to 400r / min, pass through the kiln gas with a carbon dioxide concentration of 20% for carbonation reaction until the pH is 8.0, ...

Embodiment 2

[0048] A preparation method of rod-shaped aragonite calcium carbonate, comprising the following steps:

[0049] (1) Crushing the limestone, calcining at a temperature of 1250°C for 3 hours, then digesting the calcined limestone at a gray-to-water mass ratio of 1:6.5, controlling the water temperature to 28°C to obtain lime slurry;

[0050] (2) Pass the lime slurry obtained in step (1) through a 100-mesh sieve, filter to remove slag, add water to adjust the solid content of the lime slurry to 12%, and obtain refined lime slurry for subsequent use;

[0051](3) Control the temperature of the refined lime slurry to 30-35°C, add 0.4% oxalic acid, 0.6% zinc chloride and 0.2% sodium lauryl sulfate as crystal form control agents to the calcium hydroxide in the lime slurry, and then Transport it to the carbonization tower, adjust the stirring rate to 350r / min, pass through the kiln gas with a carbon dioxide concentration of 25% for carbonation reaction until the pH is 8.0, control the ...

Embodiment 3

[0055] A preparation method of rod-shaped aragonite calcium carbonate, comprising the following steps:

[0056] (1) Crushing the limestone, calcining at a temperature of 1200°C for 4 hours, then digesting the calcined limestone at a gray-to-water mass ratio of 1:3, and controlling the water temperature to 30°C to obtain lime slurry;

[0057] (2) Pass the lime slurry obtained in step (1) through an 80-mesh sieve, filter to remove slag, add water to adjust the solid content of the lime slurry to 7%, and obtain refined lime slurry for subsequent use;

[0058] (3) Control the temperature of the refined lime slurry at 30-35°C, add calcium hydroxide in the lime slurry with 0.5% succinic acid, 0.8% calcium nitrate and 0.1% sodium lauryl sulfate as the crystal form control agent, and then Transport to the carbonization tower, adjust the stirring rate to 300r / min, feed the kiln gas with a carbon dioxide concentration of 15% for carbonation reaction until the pH is 8.0, control the flow...

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Abstract

The invention discloses a rodlike aragonite calcium carbonate preparation method. The method includes: crushing limestone, calcining, and digesting according to a lime-water mass ratio of 1:3-8 to obtain lime slurry; screening, filtering to remove residues, and adding water to adjust the solid content of the lime slurry to 7-20%, so that refined lime slurry is obtained; controlling the temperature of the refined lime slurry to 30-60 DEG C, adding a composite crystal form control agent being 0.5-2.0% of the mass of calcium hydroxide in the lime slurry, delivering to a carbonization tower, starting stirring, feeding kiln gas for carbonation, stopping gas feeding when pH reaches 8.0, and terminating carbonation to obtain precipitated calcium carbonate suspension; dewatering and drying according to a conventional method to obtain rodlike aragonite calcium carbonate. The calcium carbonate prepared according to the method is stable in crystal form, products are rodlike in appearance and large in specific surface area, and the aragonite phase content reaches 85% or above. In addition, the rodlike aragonite calcium carbonate preparation method has advantages of low energy consumption, high production efficiency, low cost, technical simplicity and the like and is easy for realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, in particular to a method for preparing rod-shaped aragonite calcium carbonate. Background technique [0002] Aragonite precipitated calcium carbonate is a metastable crystal material with high strength, high temperature resistance and high elastic modulus. Rod-shaped aragonite-type precipitated calcium carbonate has attracted widespread attention because of its morphology with a certain length-to-diameter ratio. In the field of plastic and rubber processing, rod-shaped aragonite-type precipitated calcium carbonate can be used as a reinforcing and toughening filler, which can adapt to complex processing processes, improve the processing performance of the filling system, strengthen and toughen the matrix material, and increase the filling amount. Rod-like aragonite-type precipitated calcium carbonate is used as a paper-making filler to improve paper strength and opacity. Rod-shaped ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/182C01P2002/72C01P2004/03C01P2004/10
Inventor 莫英桂朱勇韦健毅满治成刘卢科
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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