Method for preparing nano calcium carbonate by regeneratively cycling oyster shell

A technology of nano-calcium carbonate and oyster shell, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of difficult economic clearance, oyster shell pollution, high product cost, etc., and achieve easy removal and good repeatability , The effect of saving production costs

Inactive Publication Date: 2013-09-04
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the shortcomings of the above process, Gao Wenyan from Northwest University used hydrochloric acid to dissolve oyster shells and ammonium carbonate double decomposition reaction process to prepare nano-calcium carbonate with adjustable particle size and shape, but a large amount of Cl-, the use of decantation in production to remove these Cl- often requires a lot of time and washing water, and the cost of producing products with different crystal forms is high, and it is not easy to pass the test economically. At present, domestic and foreign rarely used
[0006] At home and abroad, there is no method for producing nano-calcium carbonate by recycling oyster shells. The present invention not only solves the serious pollution of oyster shells to the environment, but also turns waste into treasure , which saves production cost and has a good prospect for popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The oyster shells are washed with water, dried and crushed to obtain 10-mesh oyster shell powder. Pour 50g of oyster shell powder into the three-necked flask, put 5ml of hydrochloric acid solution with a molar concentration of 0.1 mol / mL into the dropping funnel, slowly drop it into the three-necked flask, and install a carbon dioxide gas recovery device on the other side of the three-necked flask, After reacting for 30 minutes, 1 mol / mL ammonia water was added thereto to adjust the pH to 7.5. After stirring evenly, the recovered carbon dioxide gas was passed into a three-necked flask for 40 minutes of reaction, and a white precipitate was obtained by filtration. Add the above white precipitate into 50ml of pure water at a temperature of 95°C, stir and wash three times, and dry to prepare nano-calcium carbonate.

Embodiment 2

[0022] The oyster shells are washed with water, dried and crushed to obtain 100-mesh oyster shell powder. Pour 100g of oyster shell powder into the three-necked flask, put 10ml of hydrochloric acid solution with a molar concentration of 0.1 mol / mL into the dropping funnel, slowly drop it into the three-necked flask, and install a carbon dioxide gas recovery device on the other side of the three-necked flask, After reacting for 50 minutes, 1 mol / mL ammonia water was added thereto to adjust the pH to 8. After stirring evenly, the recovered carbon dioxide gas was passed into a three-necked flask for reaction for 1 hour, and the obtained white precipitate was filtered. Add the above white precipitate into 100ml of pure water at a temperature of 90°C, stir and wash three times, and dry to prepare nano-calcium carbonate.

Embodiment 3

[0024] The oyster shells are washed with water, dried and crushed to obtain 300-mesh oyster shell powder. Pour 200g of oyster shell powder into a three-necked flask, put 4ml of hydrochloric acid solution with a molar concentration of 0.5 mol / mL into the dropping funnel, slowly drop it into the three-necked flask, and install a carbon dioxide gas recovery device on the other side of the three-necked flask, After reacting for 50 minutes, 1 mol / mL ammonia water was added thereto to adjust the pH to 7. After stirring evenly, the recovered carbon dioxide gas was passed into a three-necked flask to react for 1.5 hours, and the obtained white precipitate was filtered. Add the above white precipitate into 200ml pure water at a temperature of 90°C, stir and wash three times, and dry to prepare nano-calcium carbonate.

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Abstract

The invention discloses a method for preparing nano calcium carbonate by regeneratively cycling an oyster shell. The method comprises the steps that the oyster shell is directly used as a raw material without roasting and digestion procedures; recovery and cyclic utilization are performed by utilizing a large amount of carbon dioxide generated by dissolving the oyster shell with hydrochloric acid; and nano calcium carbonate with high whiteness and high purity is obtained by an ammonia water carbonization technology. The raw oyster shell adopted by the method is extensive in source and low in cost, solves the environmental pollution caused by the oyster shell, does not generate secondary pollution, and has good popularization and application prospects.

Description

technical field [0001] The invention relates to a method for preparing calcium carbonate nanometer powder, in particular to a method for producing nanometer calcium carbonate through regeneration and recycling of oyster shells, and belongs to the technical field of production of nanomaterial calcium carbonate. Background technique [0002] Nano-calcium carbonate material refers to ultra-fine powder calcium carbonate with a particle size between 1 and 200nm, which is a new type of high-grade functional filling material. Nano-calcium carbonate is a kind of nano-material with abundant raw materials and low price. Due to the success of ultra-fine particle and grading technology, as well as the development of calcium carbonate surface chemical treatment technology, the excellent performance and application range of nano-calcium carbonate will be wider. Quantity The demand is increasing. Nano-calcium carbonate is one of the earliest inorganic nano-fillers developed, and has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00
Inventor 赵娟
Owner GUANGDONG OCEAN UNIVERSITY
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