Method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment

A technology of calcium carbonate micropowder and hydrothermal treatment, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems that it is difficult to remove insoluble protein from shells and cannot obtain high-purity calcium carbonate micropowder, and achieve significant economic and social value and improve Effect of high hydrolysis reaction rate and high production efficiency

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

Method used

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  • Method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment
  • Method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment
  • Method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment

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Embodiment 1

[0022] Take 10 grams of 150-mesh clam shell powder, add it to 50 milliliters of 0.5 mol / liter urea aqueous solution, mix well, pour it into a 200 milliliter autoclave, treat it at 200 ° C for 2 hours, and then remove the precipitate Separation, washing, drying, to obtain calcite calcium carbonate micropowder, its photo is as figure 1 (b) shown.

[0023] Take 10 grams of 150-mesh mussel shell powder, add it to 50 ml of sodium hydroxide aqueous solution with a concentration of 1 mol / L, mix well, pour it into a 200 ml autoclave, treat it at 250 ° C for 4 hours, and then carry out precipitation separated, washed with water, and dried to obtain calcite calcium carbonate micropowder, the photo of which is as follows figure 1 (c) shown.

[0024] and figure 1 (a) Compared with the yellow clam shell raw material, the powder treated with alkaline solution hydrothermal treatment is white, especially the shell powder treated with sodium hydroxide aqueous solution ( figure 1 (c)) has t...

Embodiment 2

[0026] like figure 2 , image 3 As shown, X-ray structure analysis is carried out to the powder of sodium hydroxide aqueous solution hydrothermal treatment in embodiment 1, as figure 2 , indicating that the powder has completely transformed into a calcite structure. The scanning electron microscope photograph of the powder is as image 3 As shown, it can be seen that the powder is an equiaxed grain, and the grain size distribution is relatively uniform, ranging from 0.5 to 2 microns.

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Abstract

The invention discloses a method for preparing high-purity calcite calcium carbonate micropowder through shell hydro-thermal treatment and belongs to the field of inorganic materials. The method comprises the following process steps of: (1), grinding shells into powder and sieving the shell powder; (2), adding the shell powder to an alkali aqueous solution, and putting the mixture to a high-pressure kettle to carry out hydro-thermal treatment; and (3), separating, cleaning and drying the treated shell powder to obtain the high-purity calcite calcium carbonate micropowder, wherein the grain size of the powder is 0.5 micron to 2 microns. The method for preparing high-purity calcite calcium carbonate micro powder through shell hydro-thermal treatment disclosed by the invention has the characteristics of being low in material cost, simple in production process, environment-friendly and safe in production process; and besides, the method is suitable for large-scale high-value recycling of the waste shells.

Description

technical field [0001] The invention relates to a method for preparing calcite calcium carbonate micropowder using shells as raw materials, in particular to a method for preparing high-purity calcite calcium carbonate micropowder by hydrothermal treatment of shells. 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. The former is because limestone contains a small amount of chemical components such as magnesium, iron, manganese, silicon-aluminum compounds, and heavy metals, resulting in low purity of calcium carbonate. Can not meet the market demand, the latter preparati...

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梁若涯李小勇
Owner NANCHANG HANGKONG UNIVERSITY
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