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Preparation method of flake-shaped aragonite calcium carbonate

A technology of calcium carbonate and aragonite, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult control of process conditions, difficult industrialized production, large process energy consumption, etc., and achieve good economic and social benefits, mild operating conditions, simple craftsmanship

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when using bionics to imitate the aragonite formation process in organisms to prepare aragonite crystals, the metathesis reaction of soluble salts is mostly used. The main method is Ca(HCO 3 ) 2 Conversion method, urea hydrolysis method and MgCl 2 These methods have low yields of aragonite, and most of the calcium carbonate configuration is mainly calcite. At the same time, the cost of raw materials is high, the energy consumption of the process is large, the process conditions are difficult to control, and it is difficult to realize industrial production.
However, most of the synthetic aragonite products are needle-like or rod-like crystals, and there is no report on the synthesis of aragonite flaky calcium carbonate.

Method used

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  • Preparation method of flake-shaped aragonite calcium carbonate
  • Preparation method of flake-shaped aragonite calcium carbonate
  • Preparation method of flake-shaped aragonite calcium carbonate

Examples

Experimental program
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Effect test

preparation example Construction

[0021] The steps of the preparation method of flaky aragonite calcium carbonate are as follows:

[0022] 1) Coarsely pulverize the shells by dry method, soak in the lotion at room temperature for 4 to 48 hours, wash with a drum to remove the horny layer and prismatic layer, and wash with water to obtain nacreous calcium carbonate;

[0023] 2) Mix nacre calcium carbonate with water at a high speed to obtain a slurry with a mass percentage concentration of 30-80%, add grinding aids equivalent to 0.5-5% of the weight of nacre calcium carbonate, and use a peeling machine with zirconia balls, Alumina balls or ceramic balls are used as grinding media, and wet grinding takes 60 to 180 minutes;

[0024] 3) Pressure filtration, drying and crushing to obtain flaky aragonite calcium carbonate.

[0025] The shells are mussel shells, scallop shells, oyster shells, pearl shells or mussel shells. The washing solution is dilute hydrochloric acid, dilute sulfuric acid, dilute acetic acid, di...

Embodiment 1

[0028] 1) dry coarsely pulverize the purple mussel shell, soak it in 0.1% dilute hydrochloric acid at normal temperature for 4 hours, wash it with a drum to remove the cuticle and prism layer, and wash it to get nacre calcium carbonate;

[0029] 2) Nacre calcium carbonate was mixed with water at a high speed to obtain a slurry with a concentration of 30 wt%, and polyacrylic acid equivalent to 0.5% of the weight of nacre calcium carbonate was added, and the zirconia ball was used as a grinding medium with a peeling machine, and wet grinding was carried out for 60 minute;

[0030] 3) Pressure filtration, drying and crushing to obtain flaky aragonite calcium carbonate.

[0031] The sample XRD chart is attached figure 1 , see the attached electron microscope scanning figure 2 .

Embodiment 2

[0033] 1) scallop shells are dry coarsely crushed, soaked in a 3% sodium hypochlorite solution at normal temperature for 48 hours, washed with a drum to remove cuticles and prismatic layers, and washed to obtain nacre calcium carbonate;

[0034] 2) Nacre calcium carbonate was mixed with water at a high speed to obtain a slurry with a concentration of 80 wt%, and sodium silicate equivalent to 5% of the weight of nacre calcium carbonate was added, and the aluminum oxide ball was used as a grinding medium with a peeling machine, and wet grinding was carried out for 180 minute;

[0035] 3) Pressure filtration, drying and crushing to obtain flaky aragonite calcium carbonate.

[0036] Sample electron microscope scanning see attached image 3 .

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Abstract

The invention discloses a preparation method of flake-shaped aragonite calcium carbonate. The preparation method comprises the following steps: (1) performing dry method coarse grinding to a shell raw material, soaking the shell raw material in lotion for 4-48h at normal temperature, utilizing roller watering to remove a cuticle layer and a prismatic layer, and obtaining nacreous layer calcium carbonate by washing; (2) adding water to the nacreous layer calcium carbonate, performing high-speed agitation to prepare slurry with the concentration to be 30-80wt%, adding a grinding aid with the weight being 0.5-5% that of the nacreous layer calcium carbonate, and using a stripping machine to perform wet grinding for 60-180min with zirconia ball, alumina balls or ceramic balls serving as grinding mediums; and (3) performing filter pressing and drying grinding to obtain the flake-shaped aragonite calcium carbonate. The preparation method of the flake-shaped aragonite calcium carbonate is simple in process and does not use a poisonous harmful reagent, the operation conditions are mild, the surface activity of the prepared flake-shaped aragonite calcium carbonate is good, and the flake-shaped aragonite calcium carbonate can be widely applied to industries such as plastics, papermaking, rubber, ink, coating, building materials, medicines and food.

Description

technical field [0001] The invention relates to the field of shell utilization, in particular to a preparation method of flaky aragonite calcium carbonate. Background technique [0002] Flake calcium carbonate has the advantages of high whiteness, high smoothness and high gloss. At present, the methods for preparing flaky calcium carbonate mainly include microemulsion method, conversion method and lime milk carbonization method. Generally, organophosphorus compounds, borides, organic amines or organic acids are used as shape control agents, and the shape control agents are expensive. , high toxicity, secondary pollution, complex process, slow reaction speed, low yield and other problems. [0003] On the other hand, aragonite calcium carbonate is a new type of material that has emerged in recent years. It has the characteristics of high strength, high modulus, good heat resistance and heat insulation performance. Aragonite calcium carbonate has good compatibility with the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 夏枚生叶瑛李海晏陈涛张海燕潘丽
Owner ZHEJIANG UNIV
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