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Preparation method of nano calcium carbonate

A technology of nano-calcium carbonate and calcium oxide, applied in the field of nano-materials, can solve the problems of high quality requirements, unstable performance, and high process cost of quicklime

Inactive Publication Date: 2009-09-09
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently known nano-calcium carbonate preparation method has higher requirements on the quality of unslaked lime (usually more than 95%), the cost is high, and it is difficult to promote in a large area, thereby limiting the development of the nano-calcium carbonate industry.
Secondly, the morphology of nano-calcium carbonate is an important factor determining its application performance. How to achieve controllable morphology is the key technology for synthesizing nano-calcium carbonate, and different process routes are often used for the preparation of nano-calcium carbonate with various shapes. And equipment, equipment investment scale is large, and the process cost is high, the conditions are harsh, and the performance is unstable

Method used

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  • Preparation method of nano calcium carbonate
  • Preparation method of nano calcium carbonate
  • Preparation method of nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First add a certain amount of industrial calcium oxide generated after calcination into hot water at 60°C and stir at a constant temperature to generate Ca(OH) 2 Suspension, the mass ratio of industrial calcium oxide to water is 6 / 100, sieve through 200 mesh to remove slag, age, take 5L of the above suspension, control the concentration to 5%, add 0.1mol of crystal form control agent under stirring 60mL of sulfuric acid per L, in the above suspension, pass into the mixed gas of carbon dioxide and air with a volume content of carbon dioxide of 30%, and carry out carbonization reaction. Add 5.3 g of sodium pyrophosphate as a dispersant, stop the reaction when the pH of the suspension drops to 6.8, filter, and dry at 60° C. to obtain spherical nano-calcium carbonate with an average particle size of 40 nm. figure 1 Shown is a TEM photograph of the product.

Embodiment 2

[0014] First add a certain amount of industrial calcium oxide generated after calcination into hot water at 70°C and stir at constant temperature to generate Ca(OH) 2 Suspension, the mass ratio of industrial calcium oxide to water is 7 / 100, sieved through a 250-mesh sieve to remove slag and age, take 5L of the above-mentioned suspension, control the concentration to 8%, and mix it under stirring Add 7 g of sodium hexametaphosphate, a crystal form control agent, and pass a mixed gas of carbon dioxide and air with a carbon dioxide volume content of 30% into the above solution phase to carry out carbonization reaction. The temperature of the carbonization reaction is controlled at 15°C; the stirring speed is 400r / min, and the dispersant sodium dodecylbenzenesulfonate 8g is added during the reaction, and the reaction is stopped when the pH of the suspension drops to 7.0, filtered, and heated at 70°C Needle-shaped nano-calcium carbonate particles can be obtained by drying, the leng...

Embodiment 3

[0016] First add a certain amount of industrial calcium oxide generated after calcination into hot water at 70°C and stir at constant temperature to generate Ca(OH) 2 Suspension, the mass ratio of industrial calcium oxide to water is 8 / 100, sieved through a 300-mesh sieve to remove slag and age, take 5L of the above-mentioned suspension, control the concentration to 6%, and mix it under stirring Add 2.6 g of crystal form control agent sodium pyrophosphate, pass into the above-mentioned suspension a mixed gas of carbon dioxide and air with a carbon dioxide volume content of 30%, and carry out carbonization reaction. The temperature of the carbonization reaction is controlled at 16° C., and the stirring speed is 500 r / min , add 11g of dispersant sodium dodecylsulfonate during the reaction, stop the reaction when the pH of the suspension drops to 7.0, filter, and dry at 60°C to obtain flaky nano-calcium carbonate particles, such as figure 2 As shown, the average size of the shee...

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Abstract

The invention discloses a preparation method of nano calcium carbonate. Firstly, industrial calcium oxide is added in hot water with the temperature of 60-70 DEG C to stir at an instant temperature to generate Ca(OH)2 suspending liquid, the mass ratio of the industrial calcium oxide to the water is 6 / 100-8 / 100, the concentration of the suspending liquid is controlled to be 4-9 percent, in a stirring state, chemical additives easy to be dissolved into the water are added so as to control the shape and the structure of a calcium carbonate product, and the adding amount of the chemical additives is 0.1-2 percent of the Ca(OH)2 suspending liquid; mixed gases with carbon dioxide and air are led to the suspending liquid for carbonation reaction at the temperature of 12-18 DEG C; the stirring speed is 300r / min-500r / min; dispersant which is sodium dodecylbenzene sulfonate, or dodecyl sodium sulfate or sodium pyrophosphate is added, when the pH value of the suspending liquid is lowered to 6.8-7.2, the reaction stops, and the product can be obtained by filtering and drying.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a method for preparing nano calcium carbonate with controllable morphology. Background technique [0002] Nano calcium carbonate is a new type of ultrafine solid material. It not only has the functions of increasing product volume and reducing product cost like ordinary calcium carbonate, but also has excellent reinforcing and semi-reinforcing properties, making it an excellent functional material. The currently known preparation method of nano-calcium carbonate has higher requirements on the quality of quicklime (usually more than 95%), high cost, and is difficult to promote in a large area, thereby limiting the development of nano-calcium carbonate industry. Secondly, the morphology of nano-calcium carbonate is an important factor determining its application performance. How to achieve controllable morphology is the key technology for synthesizing nano-calcium carbonate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 徐惠刘小育李春雷苟国俊朱照琪常成功
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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