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Rugby-shaped calcium carbonate and its preparation process

A football-shaped, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of inability to prepare hollow particles, poor particle size uniformity, large equipment investment, etc., to achieve uniform and stable quality, high added value, The effect of short reaction time

Active Publication Date: 2021-07-09
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the different contact methods in the carbonization process, it is divided into intermittent bubbling carbonization method and intermittent stirring carbonization method. The former is simple to operate but consumes more energy and has poor particle size uniformity. Although the latter is relatively complicated to operate, the particle size of the product is uniform. Once higher than the former, the high-gravity carbonization method has the characteristics of low production cost, uniform particle size distribution, and short carbonization time, but the investment in equipment is large
At present, the products of spherical calcium carbonate are basically used in industries such as papermaking, rubber, paint and high-grade ink, and its price is about 1,000 yuan per ton, and due to its large particle size, it cannot be used as a template material for preparing hollow particles.

Method used

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  • Rugby-shaped calcium carbonate and its preparation process
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Examples

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Effect test

Embodiment 1

[0031] A kind of rugby-shaped calcium carbonate, belongs to calcium hydroxide solution carbonization method and prepares spherical calcium carbonate, and its preparation method comprises the following steps:

[0032] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:4 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is filtered to remove large particles and impurities to obtain refined hydroxide Calcium slurry, after the calcium hydroxide slurry is cooled to room temperature, methanol is added to adjust the calcium hydroxide content to 10%, and the amount of methanol added is 50% of the quality of the prepared calcium hydroxide slurry;

[0033] (2) Addition of crystal form directing agent: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with a stirring device, add a soluble starch solution with a mass of 3.2% calcium hydroxi...

Embodiment 2

[0037] A kind of rugby-shaped calcium carbonate, belongs to calcium hydroxide solution carbonization method and prepares spherical calcium carbonate, and its preparation method comprises the following steps:

[0038] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:3 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is filtered to remove large particles and impurities to obtain refined hydroxide Calcium slurry, after the calcium hydroxide slurry is cooled to room temperature, methanol is added to adjust the calcium hydroxide content to 12%, and the amount of methanol added is 60% of the quality of the prepared calcium hydroxide slurry;

[0039] (2) Addition of crystal form directing agent: pump the calcium hydroxide slurry adjusted well into the intermittent bubbling carbonization tower with stirring device, add 2.5% polyethyleneimine as the crystal form directing agent...

Embodiment 3

[0043] A kind of rugby-shaped calcium carbonate, belongs to calcium hydroxide solution carbonization method and prepares spherical calcium carbonate, and its preparation method comprises the following steps:

[0044] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:3 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is filtered to remove large particles and impurities to obtain refined hydroxide Calcium slurry, after the calcium hydroxide slurry is cooled to room temperature, add ethanol and water to adjust the content of calcium hydroxide to 10%, and the amount of ethanol added is 60% of the quality of the prepared calcium hydroxide slurry;

[0045] (2) Addition of crystal form directing agent: pump the calcium hydroxide slurry adjusted into the intermittent bubbling carbonization tower with stirring device, add 2.8% polyvinylpyrrolidone with a mass of calcium hydroxid...

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Abstract

The invention discloses a rugby-shaped calcium carbonate and a preparation process thereof. The preparation method is as follows: adding a crystal form directing agent to the refined and prepared calcium hydroxide slurry and stirring evenly, adjusting and controlling the initial carbonization temperature, and then introducing carbon dioxide gas for carbonization to Stop when the pH is lower than 8, and then get rugby-shaped calcium carbonate after dehydration, drying, crushing and sieving. The obtained rugby-shaped calcium carbonate of the present invention does not need surface treatment, has good dispersibility, simple process, short carbonization time, and low production cost, and the obtained rugby-shaped calcium carbonate particle diameter can be adjusted and controlled within the range of 300-900 nanometers, and can be used as a downstream product. The filler has good processing fluidity, and has high added value as a template material for hollow particles. It is not only suitable for food, medicine, cosmetics, light industry, but also for plastics, rubber, paint, ink, paper, new materials, and chemical industry. industry.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic calcium carbonate powder, and in particular relates to preparation of calcium carbonate with vaterite crystal form by calcium hydroxide and a process thereof. Background technique [0002] Different forms of calcium carbonate products have different application fields and functions. Its function is good or bad, mainly depends on the chemical composition, morphological characteristics, particle size and other parameters of calcium carbonate products, the most important of which is the crystal form and particle size distribution of calcium carbonate particles. At present, it is still a hot spot in the development of the calcium carbonate industry to artificially control the crystallization of calcium carbonate to produce nano-calcium carbonate products with special crystal shapes, so as to endow the products with higher application performance and added value. Among al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 童张法王权广廖丹葵李立硕钟玲萍黄绍权周文英蒙杨平黎声鹏覃玲意
Owner GUANGXI UNIV