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The purification method of malachite pigment

A purification method and malachite technology, applied in chemical instruments and methods, inorganic chemistry, copper compounds, etc., can solve the problems of poor repeatability between batches and low color saturation

Active Publication Date: 2019-05-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors found that the current malachite pigments generally have problems such as low color saturation and poor repeatability between batches.

Method used

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  • The purification method of malachite pigment
  • The purification method of malachite pigment
  • The purification method of malachite pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Weigh 10.0 g of the raw material (malachite natural mineral pigment tetragreen) and place it in a 500 mL beaker, add 200 mL of deionized water, and stir for 3 minutes at 100 W ultrasonic power in an ultrasonic cleaner to form a well-dispersed suspension .

[0068] (2) Lower the temperature of the above suspension to 5 degrees Celsius with a cold bath, and add 40 mL of 0.5 mol / L nitric acid dropwise under sufficient stirring, during which the temperature of the reaction system is controlled not to exceed 8 degrees Celsius. After the addition was complete, the cooling bath was removed and stirring was continued for 30 minutes.

[0069] (3) Add 20 mL of 1.0 mol / L copper nitrate aqueous solution to the reaction system, and add dropwise 100 mL of 0.8 mol / L sodium bicarbonate aqueous solution under stirring, forming a sky blue flocculent precipitate in the system.

[0070] (4) Stirring was continued for 8 hours at room temperature (25 degrees Celsius), and the sky blue p...

Embodiment 2

[0074] (1) Weigh 10.0 g of the raw material (malachite natural mineral pigment trigreen) and place it in a 500 mL beaker, add 200 mL of deionized water, and stir for 3 minutes at 100 W ultrasonic power in an ultrasonic cleaner to form a well-dispersed suspension .

[0075] (2) Control the temperature of the above-mentioned suspension at 25 degrees Celsius with a water bath, and add 40 mL of 0.1 mol / L sulfuric acid dropwise under sufficient stirring, during which the temperature of the reaction system is controlled not to exceed 30 degrees Celsius. Stirring was continued for 30 minutes after the addition was complete.

[0076] (3) Add 20 mL of 0.5 mol / L copper sulfate aqueous solution to the reaction system, and dropwise add 100 mL of 0.4 mol / L sodium bicarbonate aqueous solution under stirring, forming a sky blue flocculent precipitate in the system.

[0077] (4) The temperature of the reaction system was raised to 80 degrees Celsius, and the stirring was continued for 1 hour...

Embodiment 3

[0081] (1) Weigh 10.0 g of the raw material (malachite natural mineral pigment tetragreen) and place it in a 500 mL beaker, add 200 mL of deionized water, and stir for 3 minutes at 100 W ultrasonic power in an ultrasonic cleaner to form a well-dispersed suspension .

[0082] (2) Reduce the temperature of the above suspension to 10°C with a cooling bath, and add 40 mL of 0.65 mol / L acetic acid dropwise under sufficient stirring, during which the temperature of the reaction system is controlled not to exceed 15°C. After the addition, the temperature was raised to 45 degrees Celsius, and stirring was continued for 30 minutes.

[0083] (3) Add 20 mL of 0.3 mol / L copper acetate aqueous solution to the reaction system, and add dropwise 100 mL of 0.2 mol / L sodium carbonate aqueous solution under stirring, forming a sky blue flocculent precipitate in the system.

[0084] (4) Stirring was continued for 24 hours at 4° C., and the sky blue precipitate gradually turned green. Stop stirr...

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Abstract

The invention discloses a malachite pigment purifying method. The method comprises the following steps: (1) primarily dispersing a to-be-purified material to form a first suspension liquid; (2) adding an acid solution into the first suspension liquid to form a first mixing solution; (3) adding Cu<2+> ion in to the first mixing solution, then adding at least one of CO3<2-> and HCO<3-> to form a first precipitate; (4) separating the first precipitate, and secondarily dispersing the first precipitate to form a second suspension liquid; (5) settling the second suspension liquid, and collecting a second precipitate, so as to obtain a purified malachite pigment. Therefore, the purified malachite pigment is obtained simply and conveniently. The hue of the purified malachite pigment is not changed, the color saturation is obviously increased, the color development effect is strengthened, the repeatability of batches is strengthened, the wasting of a fine particle is avoided, the resource utilization rate is increased, and the purifying method is favorable for improving the economic indicator of the production process.

Description

technical field [0001] The invention relates to the field of preparation of pigments, in particular to a method for purifying malachite pigments. Background technique [0002] Natural mineral pigments are a very important class of materials in traditional painting and decorative art in my country. They have the advantages of pure hue, high hiding power, stable properties, and strong light and weather resistance. As one of the natural mineral pigments, malachite pigment is prepared from natural malachite through production and processing. Malachite pigment is also called "stone green". It is the most commonly used in traditional Chinese painting, colored sculpture and ancient architectural painted decoration. One of the mineral pigments. [0003] However, the current purification methods of malachite pigments still need to be improved. Contents of the invention [0004] The present invention is based on the inventor's discovery and recognition of the following facts and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G3/00
CPCC01G3/00C01P2004/51C01P2004/61C01P2006/62C01P2006/63C01P2006/64C01P2006/65
Inventor 王恺盖国胜杨玉芬
Owner TSINGHUA UNIV