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Preparation process of regular cubic crystal form nano calcium carbonate

A nano-calcium carbonate and preparation technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, chemical instruments and methods, etc., can solve the problems of irregular product particle shape, long carbonation reaction time, unstable quality, etc. , to achieve uniform and stable quality, short reaction time, and reduce production costs

Pending Publication Date: 2020-11-03
王权广
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a preparation process for regular cubic crystal nano-calcium carbonate to solve the problems of long carbonation reaction time, irregular particle shape, uneven particle size and unstable quality in the existing nano-calcium carbonate preparation technology

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  • Preparation process of regular cubic crystal form nano calcium carbonate

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Embodiment 1

[0027] The preparation process of regular cubic crystal nano-calcium carbonate belongs to the preparation of regular cubic crystal nano-calcium carbonate by carbonization of calcium hydroxide solution. The preparation method comprises the following steps:

[0028] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and hot water at 70°C with a mass ratio of 1:5 are fully stirred and digested, aged and cooled properly, and the obtained lime slurry is sieved to remove large particles and impurities to obtain hydrogen The calcium oxide slurry is further refined through a suspension separator, and the calcium hydroxide slurry is adjusted to be cooled to room temperature to adjust the calcium hydroxide solid content to 10%;

[0029] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with stirring device, add sodium hydroxide as alkali metal ions, and adjust the concentration of sodium ions in...

Embodiment 2

[0035] The preparation process of regular cubic crystal nano-calcium carbonate belongs to the preparation of regular cubic crystal nano-calcium carbonate by carbonization of calcium hydroxide solution. The preparation method comprises the following steps:

[0036] (1) Lime digestion and calcium hydroxide slurry preparation: Lime and water at room temperature with a mass ratio of 1:8 are fully stirred and digested, aged and cooled properly, and the obtained lime slurry is sieved to remove large particles and impurities to obtain calcium hydroxide The slurry is further refined through a suspension separator, and the calcium hydroxide slurry is adjusted to be cooled to room temperature to adjust the calcium hydroxide solid content to 12%;

[0037] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with stirring device, add sodium bicarbonate as alkali metal ions, and adjust the concentration of sodium io...

Embodiment 3

[0043] The preparation process of regular cubic crystal nano-calcium carbonate belongs to the preparation of regular cubic crystal nano-calcium carbonate by carbonization of calcium hydroxide solution. The 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 1:9 are fully stirred and digested and properly aged and cooled, and the obtained lime slurry is sieved to remove large particles and impurities to obtain calcium hydroxide The slurry is further refined through a suspension separator, and the calcium hydroxide slurry is adjusted to be cooled to room temperature to adjust the calcium hydroxide solid content to 11%;

[0045] (2) Addition of alkali metal ions: pump the adjusted calcium hydroxide slurry into the intermittent bubbling carbonization tower with a stirring device, add sodium bicarbonate as alkali metal ions, and adjust the concentration of sodi...

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Abstract

The invention discloses a preparation process of nano calcium carbonate in a regular cubic crystal form, and belongs to the technical field of preparation of nano calcium carbonate powder of inorganicnon-metallic materials. The preparation process of the regular cubic crystal form nano calcium carbonate comprises the following steps: adding alkali metal ions before carbonation reaction, fully mixing the alkali metal ions with calcium hydroxide slurry, adjusting the initial carbonization temperature, introducing carbon dioxide mixed gas with a certain concentration, and carrying out rapid carbonation reaction to obtain calcium carbonate slurry; and carrying out curing, surface treatment, dehydration, drying and crushing operations on the calcium carbonate slurry to obtain the regular cubiccrystal form nano calcium carbonate. The invention can solve the problems that in the prior art, the carbonation reaction time of nano calcium carbonate is long, product particles are irregular in morphology, cubic crystal particles are free of water caltrops, the particle size is uneven, and the quality is unstable.

Description

technical field [0001] The invention belongs to the technical field of preparation of calcium carbonate powder in inorganic non-metallic materials, and in particular relates to a preparation process of regular cubic crystal nano-calcium carbonate. Background technique [0002] Domestic industrial precipitated calcium carbonate is divided into two types according to its appearance: one is conventional spindle light calcium carbonate, referred to as light calcium in China, and the product quality and grade are mainly divided by sedimentation volume; the other is cubic nano calcium carbonate It is referred to as nano-calcium in China, and the classification of nano-calcium carbonate is mainly based on the specific surface area and the difference in modification process. The refined production process in foreign countries mainly improves calcium carbonate crystal morphology, and divides calcium carbonate products by different degrees of regular crystal morphology. Light calcium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCC01F11/181B82Y40/00C01P2004/64C01P2004/62C01P2004/03C01P2002/30
Inventor 王权广王志广
Owner 王权广
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