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Method for preparing calcium carbonate powders of different structures and shapes

A technology of calcium carbonate powder and calcium bicarbonate, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of complex process and high cost

Inactive Publication Date: 2012-10-31
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest feature of the products produced by this process is that the dispersion is very good, but the process is a bit complicated, and the first carbonization process needs an automatic control system to complete, and the cost is high. In the end, this technology has not been effectively improved and developed ["Nano Calcium Carbonate Key Technology ", edited by Yan Xin, Wang Peiliang, Shu Junjie, Beijing: Chemical Industry Press, 2007]

Method used

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  • Method for preparing calcium carbonate powders of different structures and shapes
  • Method for preparing calcium carbonate powders of different structures and shapes
  • Method for preparing calcium carbonate powders of different structures and shapes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add calcium oxide or calcium hydroxide powder into 4 flasks filled with distilled water. After stirring to fully react or dissolve, pass in excess carbon dioxide gas and filter with filter paper to obtain an aqueous solution of calcium bicarbonate; The flask of the calcium aqueous solution was placed in a water bath and heated to 70°C, 80°C, 90°C, and 100°C while stirring and kept for 60 minutes. Calcium bicarbonate is decomposed to form calcium carbonate, which is filtered or centrifuged and dried to obtain calcium carbonate powder. The crystal type and particle morphology of the calcium carbonate powder obtained are as figure 1 , figure 2 Shown. At 70℃, the main crystal phase is rhombohedral calcite, which also contains a large amount of flake vaterite phase and a small amount of rod-shaped aragonite phase; below 80℃, the content of calcite increases, while the amount of vaterite and aragonite All have decreased; below 90℃, the number of calcite further increases, th...

Embodiment 2

[0035] Add calcium oxide or calcium hydroxide powder to 3 flasks filled with distilled water, after stirring to fully react or dissolve, pass in excess carbon dioxide gas, filter with filter paper to obtain an aqueous solution of calcium bicarbonate; will contain calcium bicarbonate The flask of the aqueous solution was placed in a water bath and heated to 80°C while stirring and kept for 30min, 60min, and 90min respectively. Calcium bicarbonate is decomposed to form calcium carbonate, which is filtered or centrifuged and dried to obtain calcium carbonate powder. The crystal type and particle morphology of the calcium carbonate powder obtained are as image 3 , Figure 4 Shown. The decomposition reaction proceeded to 30 minutes to obtain all rhombohedral calcite phases. When the reaction proceeded to 60 minutes, a small amount of flake vaterite crystal phases appeared, and when the reaction proceeded to 90 minutes, a large number of rod-shaped aragonite phases appeared. .

Embodiment 3

[0037] Add calcium oxide or calcium hydroxide powder to 8 flasks filled with distilled water, after stirring to fully react or dissolve, pass in excess carbon dioxide gas, filter with filter paper to obtain an aqueous solution of calcium bicarbonate; Add different types and quantities of additives to the flask of the aqueous solution (see Table 1), and mechanically stir for 30 minutes to make the additives fully interact with calcium ions. The flask containing the fully mixed calcium bicarbonate aqueous solution is placed in a water bath, heated to 90°C while stirring and kept for 60 minutes. The calcium bicarbonate decomposes to form calcium carbonate, which is filtered or centrifuged and dried to obtain calcium carbonate powder ( Figure 5 ).

[0038] Table 1 SEM images of calcium carbonate powder obtained under various conditions

[0039] Figure 5

[0040] The particle morphology of the obtained calcium carbonate powder is as Figure 5 As shown, the calcite crystals of rh...

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Abstract

The invention discloses a method for preparing calcium carbonate powders of different structures and shapes. The method comprises the following steps of: heating a calcium bicarbonate solution in different temperatures under the conditions of the participation of an additive or not, and resolving to generate calcium carbonate in different times. The crystal types of the calcium carbonate powders and the shapes of particles can be controlled through reaction temperatures and reaction times, and the diversification of the crystal types of the calcium carbonate powders and the shapes of particles can be particularly realized through the type and the amount of the additive.

Description

Technical field [0001] The invention relates to a preparation method of calcium carbonate powder, in particular to a novel preparation method of calcium carbonate powder with different structures and morphologies, and belongs to the technical field of preparation of inorganic non-metal powders. Background technique [0002] Calcium carbonate is one of the most widely used inorganic non-metallic fillers. According to the preparation method, calcium carbonate is divided into heavy calcium carbonate (heavy calcium, GCC) and light calcium carbonate (light calcium, also known as precipitated calcium carbonate, PCC). Heavy calcium is a product made by using physical methods to clean, crush, crush, classify, and separate minerals such as limestone and dolomite containing more than 90% calcium carbonate. Light calcium is prepared by chemical methods. According to whether it is activated or not, it can be divided into ordinary light calcium carbonate and nano-active calcium carbonate. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 蒋久信刘嘉宁王娟红唐俊许东东王静
Owner HUBEI UNIV OF TECH
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