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A method for changing the color of green and white jade

A technology of lightening and bluish-white color, applied in the field of mineral materials, can solve problems that have not been reported yet, and achieve the effect of low cost, simple process and strong operability

Active Publication Date: 2020-09-11
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the research on the color change of the darker green and white jade has not seen any reports in this regard after consulting various documents and materials.

Method used

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  • A method for changing the color of green and white jade
  • A method for changing the color of green and white jade
  • A method for changing the color of green and white jade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Sample Preparation

[0020] Select Qinghai smoke sapphire sample 1 and sample 2 with fine texture, color under standard light source (color temperature is 4874K), observed under R, G, B color filters, color tone RGB is (109.124.105), refractive index is 1.610, density is 2.98g / cm 3 , the hardness HRA is 107.1 (measured at three points, taking the average value), ground into 1cm 2 thin slices with a thickness of 0.5 cm.

[0021] Step 2: Heating in a reducing environment

[0022] Mix sodium oxalate (reducing agent) and potassium chloride in a ratio of 5:1, grind them into powder in an agate mortar, and mix well. Put sample 1 into a corundum alumina crucible with a diameter of 20 cm and a cover containing the mixed powder, and add a small amount of distilled water. After heating to a certain temperature, sodium oxalate decomposes and releases CO, creating a good reducing environment. The residual component is sodium carbonate, and its melting point is higher th...

Embodiment 2

[0027] This embodiment is a comparative example for the implementation of the invention, for comparison with the embodiment of the invention.

[0028] Step 1: Sample Preparation

[0029] The same sample as in Example 1 was used.

[0030] Step 2: Oxidation Heating Process

[0031] Mix potassium perchlorate (oxidant) and potassium chloride (catalyst) in a ratio of 4:1, grind them into powder in an agate mortar, and mix well. Put the sample 2 into a corundum alumina crucible with a cover diameter of 20 cm that contains the mixed powder, and add a small amount of distilled water. After heating to a certain temperature, the oxide decomposes and releases oxygen, constructing a good oxidizing environment, and the remaining component potassium chloride is the same as the catalyst component added earlier, which is beneficial to the progress of the reaction. Heat in an oxidizing environment, set the heating rate to 10°C / min, and raise the temperature to 800°C.

[0032] Step 3: After...

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Abstract

The invention discloses a color change method for lightening light greenish white jade. The color change method comprises the following steps: I, preparing samples, namely taking samples of same sizes and thicknesses from light greenish white jade of different colors; II, covering the samples with a mixture, and slowly heating to 800 DEG C, wherein the mixture consists of a catalyst and a reducing agent which are grinded and uniformly mixed according to a certain ratio; III, cooling, so as to obtain the lightened light greenish white jade 3 hours after cooling. The color change method is simple and convenient to operate and low in cost. The value of the lightened light greenish white jade is increased by 1 time or greater of that of original light greenish white jade, and very high marketing values can be made.

Description

technical field [0001] The invention relates to the color change of green and white jade, and belongs to the field of mineral material science. Background technique [0002] Qingbaiyu is a calcium-magnesium silicate containing crystal water that is abundant in Qinghai, my country. It is a silicate with a double-chain structure in mineralogy and is relatively stable. The research on the color-causing elements and mechanism of green and white jade lags behind, and most of them focus on the color-causing element being Fe 2+ , Fe 3+ etc., the color mechanism is generally Fe 2+ , Fe 3+ electronic transitions. [0003] Qingbai jade is a unique variety of Qinghai nephrite jade. The color depth varies greatly. The lighter color of Qingbai jade is light cyan, and the darker is dark cyan. The market price of raw materials is 3,000 yuan / kg; Higher, the market price of raw materials is 8000 yuan / kg, which is relatively close to white jade, and the market demand is relatively large....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/00
CPCC04B40/0082
Inventor 于海燕
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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