Preparation process for preparing regular spherical calcium carbonate through calcium chloride and ammonia water solution carbonization method

An ammonia solution and a preparation process technology, applied in the field of calcium carbonate, can solve the problem that spherical calcium carbonate particle morphology and particle size are difficult to control, it is difficult to prepare spherical calcium carbonate with uniform particle size, and large-scale industrial production cannot be realized. problem, to achieve the effect of good pickling to remove the template, uniform and stable quality, easy operation and control

Pending Publication Date: 2020-12-29
王权广
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of double decomposition method is that the preparation method is simple and easy to prepare spherical calcium carbonate particles, but the shape and particle size of spherical calcium carbonate particles are difficult to control, and it is difficult to prepare spherical calcium carbonate with uniform particle size. The production efficiency of this method is currently low. Failed to achieve large-scale industrial production

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  • Preparation process for preparing regular spherical calcium carbonate through calcium chloride and ammonia water solution carbonization method
  • Preparation process for preparing regular spherical calcium carbonate through calcium chloride and ammonia water solution carbonization method
  • Preparation process for preparing regular spherical calcium carbonate through calcium chloride and ammonia water solution carbonization method

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Embodiment 1

[0033] A kind of preparation technology of calcium chloride, ammonia solution carbonization regulation whole spherical calcium carbonate, comprises the following steps:

[0034] (1) Preparation of calcium chloride and ammonia solution: calcium hydroxide and water at room temperature are fully stirred and dissolved according to the mass ratio of 1:4, and the molar ratio of calcium hydroxide and ammonium chloride is 1:2.05 Add ammonium chloride and fully stir to dissolve the reaction, that is, there is a slight excess of ammonium chloride. After sufficient reaction, filter the obtained calcium chloride and ammonia solution to remove insoluble matter and impurities to obtain a clear liquid. Add methanol to adjust the concentration of calcium chloride to 10%. The addition amount is 40% of the prepared calcium chloride and ammonia solution quality;

[0035] (2) Addition of the crystal morphology control agent: pump the calcium chloride and ammonia solution that have adjusted the co...

Embodiment 2

[0039]A kind of preparation technology of calcium chloride, ammonia solution carbonization regulation whole spherical calcium carbonate, comprises the following steps:

[0040] (1) Preparation of calcium chloride and ammonia solution: calcium hydroxide and water at room temperature are fully stirred and dissolved according to the mass ratio of 1:5, and the molar ratio of calcium hydroxide and ammonium chloride is 1:2.2 Add ammonium chloride and fully stir to dissolve the reaction, that is, there is a slight excess of ammonium chloride. After sufficient reaction, filter the obtained calcium chloride and ammonia solution to remove insoluble matter and impurities to obtain a clear liquid. Add ethanol to adjust the concentration of calcium chloride to 8%, ethanol The addition amount is 50% of the prepared calcium chloride and ammonia solution quality;

[0041] (2) Addition of crystal morphology control agent: pump the calcium chloride and ammonia solution with adjusted concentrati...

Embodiment 3

[0045] A kind of preparation technology of calcium chloride, ammonia solution carbonization regulation whole spherical calcium carbonate, comprises the following steps:

[0046] (1) Preparation of calcium chloride and ammonia solution: calcium hydroxide and water at room temperature are fully stirred and dissolved according to the mass ratio of 1:4, and the molar ratio of calcium hydroxide and ammonium chloride is 1:2.05 Add ammonium chloride and fully stir to dissolve the reaction, i.e. ammonium chloride is slightly excessive. After sufficient reaction, filter the obtained calcium chloride and ammonia solution to remove insoluble matter and impurities to obtain a clear liquid. Add water to adjust the concentration of calcium chloride to 10%. Add organic solvent as carbon dioxide dissolving agent and calcium carbonate crystal form stabilizer;

[0047] (2) Crystal morphology control agent is added: no crystal morphology control agent is added;

[0048] (3) Carbonization: adjus...

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Abstract

The invention discloses a preparation process for preparing regular spherical calcium carbonate through acalcium chloride and ammonia water solution carbonization method. The preparation process comprises the following steps: adding an organic solvent into a calcium chloride and ammonia water solution to serve as a carbon dioxide dissolving agent and a calcium carbonate crystal form stabilizer, adding an inorganic morphology control agent into the calcium chloride and ammonia water solution, and fully mixing; and introducing carbon dioxide for carbonization until the pH value is lower than 8 to obtain calcium carbonate slurry, and dehydrating, washing and drying the calcium carbonate slurry to obtain the spherical calcium carbonate. The obtained spherical calcium carbonate does not need surface treatment, is regular in sphere, good in dispersity, simple in preparation process, short in carbonization time and low in production cost, and the particle size of the prepared spherical calcium carbonate can be adjusted and controlled within the range of 0.1-5 micron.

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 the preparation of calcium carbonate with spherical vaterite crystal form by carbonization of calcium chloride and ammonia solution and a process thereof. Background technique [0002] Using limestone as raw material, the technology of producing precipitated calcium carbonate by calcium hydroxide carbonization method is relatively mature. The key technology that affects the quality of the final product is the carbonization process, which directly affects the crystal shape, particle size, specific surface area, oil absorption value, and sedimentation volume of the physical properties of the product. Wait. Therefore, the carbonization process is different, the carbonization equipment is different, and the physical properties of its products have their own characteristics. The purpose of carbonization is to control ...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/184C01F11/182C01F11/181C01P2004/32C01P2004/62C01P2004/61C01P2004/03
Inventor 王权广黄江凤王智显王志广
Owner 王权广
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