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Method for preparing nanometer calcium carbonate by virtue of oyster shells

A nano calcium carbonate, oyster shell technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of low absorption rate, large product particles, wide particle size distribution, etc., and achieve simple preparation steps and increase in size. The contact area and the effect of small product particles

Inactive Publication Date: 2016-10-26
陈毅忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: the preparation of nano-calcium carbonate according to the current method is carried out in a bubble column reactor, and the carbonization reaction time is longer due to the inhomogeneity of the gas phase distribution and the smaller contact area of ​​the gas-liquid phase boundary. The CO2 absorption rate is low, the product particles are large, the particle size distribution is wide, and it is difficult to prepare high-grade ultra-fine products. A kind of oyster shell is used as raw material, and calcium oxide powder is prepared by salt washing and calcining, and then put into Calcium hydroxide precipitate is obtained by hot water digestion reaction, dried and put into Buchner funnel, carbonized by sublimation of dry ice, and finally dried to obtain nano-calcium carbonate
The invention utilizes dry ice sublimation to produce uniform carbon dioxide, increases the solid-gas phase boundary contact area, and then strengthens the carbonization reaction through ultrasonic cavitation, improves the carbon dioxide absorption rate and makes the prepared calcium carbonate powder particle size more uniform, solving the traditional problem Due to the inhomogeneity of the gas phase distribution and the small contact area of ​​the gas-liquid phase boundary in the bubble column carbonization method, the carbonization reaction time is longer, and the CO 2 The problem of low absorption rate, large product particles and wide particle size distribution can be used for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First take 2kg of oyster shells, put them into a sodium chloride solution with a mass concentration of 5%, soak them for 1 hour, rinse them with deionized water 3 times, remove surface impurities, put them into a jet mill to pulverize them for 15 minutes after they are naturally air-dried, and then Grind with a sand mill for 40 minutes and pass through a 200-mesh standard sieve to obtain oyster shell powder; then put the above-obtained oyster shell powder into a tubular resistance furnace, heat up to 900°C, and heat-preserve and calcinate for 2 hours to obtain a white powder. Mix the white powder with distilled water at 60°C at a liquid ratio of 1:5, and stir the reaction with a magnetic stirrer at a speed of 200r / min for 15 minutes; after the reaction is completed, cool it down to room temperature naturally, and put it in a water bath at 4°C to settle overnight , filtered and separated to obtain calcium hydroxide precipitate, put the obtained precipitate into an oven, a...

example 2

[0020] First take 3kg of oyster shells, put them into a sodium chloride solution with a mass concentration of 7%, soak them for 2 hours, rinse them with deionized water 4 times, remove surface impurities, put them into a jet mill after they are naturally air-dried, and pulverize them for 18 minutes, and then Grind with a sand mill for 45 minutes and pass through a 200-mesh standard sieve to obtain oyster shell powder; then put the oyster shell powder obtained above into a tube-type resistance furnace, heat up to 950 ° C, and heat-preserve and calcinate for 3 hours to obtain a white powder. Mix the white powder with distilled water at 65°C at a liquid ratio of 1:5, and stir the reaction with a magnetic stirrer at a speed of 250r / min for 18 minutes; after the reaction is completed, cool it down to room temperature naturally, and put it in a water bath at 5°C to settle overnight , filtered and separated to obtain calcium hydroxide precipitate, put the obtained precipitate into an ...

example 3

[0022]First take by weighing 3kg oyster shells, put them into a sodium chloride solution with a mass concentration of 9% and soak them for 2 hours, rinse them with deionized water for 5 times, remove surface impurities, put them into a jet mill to pulverize them for 20 minutes after they are naturally air-dried, and then Grind with a sand mill for 50 minutes, and pass through a 200-mesh standard sieve to obtain oyster shell powder; then put the oyster shell powder obtained above into a tubular resistance furnace, heat up to 1000°C, and heat-preserve and calcinate for 4 hours to obtain a white powder. Mix the white powder with distilled water at 70°C with a liquid ratio of 1:5, and stir the reaction with a magnetic stirrer at a speed of 300r / min for 20 minutes; after the reaction is completed, cool it down to room temperature naturally, and put it in a water bath at 6°C for precipitation overnight , filtered and separated to obtain calcium hydroxide precipitate, put the obtained...

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Abstract

The invention discloses a method for preparing nano-calcium carbonate by using oyster shells, and belongs to the technical field of preparing nano-calcium carbonate. In the present invention, oyster shells are used as raw materials, washed with salt and calcined to obtain calcium oxide powder, then put into hot water for digestion and reaction to obtain calcium hydroxide precipitate, after drying, put into Buchner funnel, use dry ice to sublimate for carbonization, and finally dry to obtain Nano calcium carbonate. The invention utilizes dry ice sublimation to produce uniform carbon dioxide, increases the solid-gas phase boundary contact area, and then strengthens the carbonization reaction through ultrasonic cavitation, improves the carbon dioxide absorption rate and makes the prepared calcium carbonate powder particle size more uniform, solving the traditional problem Due to the inhomogeneity of the gas phase distribution and the small contact area of ​​the gas-liquid phase boundary in the bubble column carbonization method, the carbonization reaction time is longer, and the CO 2 The problems of low absorption rate, large product particles and wide particle size distribution can be industrialized.

Description

technical field [0001] The invention relates to a method for preparing nano-calcium carbonate by using oyster shells, and belongs to the technical field of preparing nano-calcium carbonate. Background technique [0002] Oyster shells are mainly composed of inorganic substances, and also contain a small amount of organic substances, and the inorganic substances are mainly CaCO 3 , its content is about 93% of the oyster shell weight, followed by magnesium oxide, silicon dioxide and so on. In addition, it also contains more than 20 kinds of trace and trace elements. At present, the processing of seafood such as oysters in our country is only limited to the edible part, and the processing of oyster shells which accounts for more than the quality of oysters is seldom processed. About 10,000 tons of oyster shells are thrown into garbage dumps or Reclamation has become a major environmental hazard. In oyster shells, the mass fraction of calcium carbonate is as high as above. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
CPCC01F11/18
Inventor 陈毅忠盛海丰林茂平
Owner 陈毅忠
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