Method for preparing lamellar aragonite calcium carbonate powder from shell under hydrothermal condition

A technology of calcium carbonate powder and shell powder, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficulty in removing shell insoluble protein, inability to obtain aragonite-structured calcium carbonate, and inability to obtain high-purity calcium carbonate micropowder, etc. Achieve significant economic and social value, improve hydrolysis reaction rate, and low cost of raw materials

Inactive Publication Date: 2013-05-08
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

Patent CN102583482 A discloses a use of dilute acid or dilute alkali lotion to remove the cuticle and prismatic layer of shells, and then carry out wet ball milling to the nacre calcium carbonate water slurry added with grinding aids to prepare flaky aragonite calcium carbonate, However, it is difficult to completely remove the insoluble protein in shells by this method, and it is impossible to obtain high-purity calcium carbonate micropowder
[0004] Acid-base as a catalyst can be applied to hydrolyze water-insoluble protein to obtain high-purity calcium carbonate, but alkaline aqueous solution has the function of mineralizer, and it is easy to cause phase change of aragonite under hydrothermal conditions (dissolution-recrystallization mechanism), Generate calcite structure calcium carbonate with higher thermal stability, and aragonite structure calcium carbonate cannot be obtained; while conventional inorganic acid solution is easy to chemically react with calcium carbonate to generate carbon dioxide gas and water-soluble calcium salt

Method used

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  • Method for preparing lamellar aragonite calcium carbonate powder from shell under hydrothermal condition
  • Method for preparing lamellar aragonite calcium carbonate powder from shell under hydrothermal condition

Examples

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Embodiment 1

[0022] Take 5 grams of 150-mesh clam shell powder, add it to 60 ml of tartaric acid aqueous solution with a concentration of 0.1 mol / liter, mix well, pour it into a 100 ml tetrafluoroethylene-lined autoclave, and treat it at 190°C for 6 hours , and then separate the precipitate, wash with water, and dry to obtain calcium carbonate micropowder. The X-ray structure analysis of clam shell powder after hydrothermal treatment shows that the powder is calcium carbonate with aragonite structure, such as figure 1 as shown,

Embodiment 2

[0024] Take 10 grams of 150-mesh mussel shell powder, add it to 60 ml of citric acid aqueous solution with a concentration of 0.2 mol / L, mix well, pour it into a 100 ml tetrafluoroethylene-lined autoclave, and treat it at 160°C for 6 hours , and then separate the precipitate, wash with water, and dry to obtain calcium carbonate micropowder. SEM observation of hydrothermally treated mussel shell powder, such as figure 2 Show. It can be seen from the photos that the powder particles are typical strip-shaped aragonite, which is the same shape as shell aragonite, indicating that the flaky aragonite structure is still retained after hydrothermal treatment in citric acid solution, and the particle size of the powder is between Between 1 and 10 microns.

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Abstract

The invention discloses a method for preparing lamellar aragonite calcium carbonate powder from a shell under a hydrothermal condition, and belongs to the field of inorganic material. The method comprises the following process steps: (1) grinding the shell into powder and screening the powder; (2) adding the shell powder into an aqueous solution of polybasic carboxylic acid, and adding the resulting solution into a high pressure kettle to carry out hydrothermal treatment; and (3) separating, washing and drying the treated shell powder to obtain the aragonite calcium carbonate powder with powder particle size being 1-10mu m. According to the method disclosed by the invention, the lamellar aragonite calcium carbonate powder is prepared from the shell by means of hydrothermal treatment, and the method has the characteristics of low raw material cost, simple production process, environment-friendly production process and the like, and is suitable for recycling waste shells on a large scale and with high added value.

Description

technical field [0001] The invention relates to a method for preparing calcium carbonate powder by using shells as raw materials, in particular to a method for preparing flaky aragonite structure calcium carbonate powder from shells under hydrothermal conditions. Background technique [0002] Calcium carbonate is widely used as an inorganic filler in the fields of rubber, plastics, ink, papermaking, medicine, food, and electronic and optical materials. In recent years, its preparation technology has developed towards high purification and miniaturization. At present, calcium carbonate production usually adopts the preparation process of limestone calcination-digestion-carbonization or multi-step carbonization method. Because the former contains a small amount of chemical components such as magnesium, iron, manganese, silicon-aluminum compounds, and heavy metals in the limestone, the purity of calcium carbonate is not high and cannot meet the market demand. higher cost. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 卢金山韩业创白晓煌
Owner NANCHANG HANGKONG UNIVERSITY
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