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A method for changing the color of smoked sapphire

A technology for lightening and toning the color, which is applied in the field of mineral materials, can solve problems that have not been reported yet, and achieve the effects of low cost, strong operability, and simple process

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 smoke sapphire has not been reported in this regard after consulting various documents and materials.

Method used

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  • A method for changing the color of smoked sapphire
  • A method for changing the color of smoked sapphire
  • A method for changing the color of smoked sapphire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Sample Preparation

[0019] Select the smoke sapphire sample 1 and sample 2 with a fine texture, the color is observed under the R, G, and B color filters under the standard light source (color temperature is 4874K), the hue RGB is (126.133.139), the refractive index is 1.600, and the static water density is 2.92g / cm 3 , the hardness HRA is 116.2 (measured at three points, taking the average value), ground into 1cm 2 thin slices with a thickness of 0.5 cm.

[0020] Step 2: Heating in a reducing environment

[0021] Mix sodium oxalate (reducing agent) and potassium bromide 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 carbonat...

Embodiment 2

[0026] Example 2 is a comparative example under different environments, and is used for comparison with Example 1, which is the example of the present invention.

[0027] Step 1: Sample Preparation

[0028] The same sample as in Example 1 was used.

[0029] Step 2: Oxidation Heating Process

[0030] 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.

...

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Abstract

The invention discloses a method for simply and feasibly lightening the color of smoky sapphire. The method for simply and feasibly lightening the color of smoky sapphire comprises following steps: 1, preparing samples, selecting smoky sapphire with different color tones, and preparing the samples with same sizes and thickness; 2, covering the samples with a mixture, wherein the mixture is prepared by grinding a catalyst and a reducing agent, uniformly mixing the ground catalyst and reducing agent at a certain ratio, and heating slowly to 800 DEG C; and 3, in a cooling stage, cooling for 3h to obtain the smoky sapphire with lightened color. The method is easy to operate and low in cost. The value of the smoky sapphire with the lightened color is increased by certain times that of the original smoky sapphire, so that the market value is extremely high.

Description

technical field [0001] The invention relates to the color change of smoke sapphire and belongs to the field of mineral material science. Background technique [0002] Smoky sapphire is a kind of calcium magnesium silicate containing crystal water, which is abundant in Qinghai, my country. It is a silicate with double-chain structure in mineralogy and is relatively stable. The research on the color-causing elements and mechanism of smoke sapphire 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] Smoked sapphire is a unique variety of nephrite jade, with a great difference in color depth. The lighter smoked sapphire is light cyan, and the darker one is dark cyan. The raw material market price is 2,000 yuan / kg; the lighter smoked sapphire has a higher value. , The market price of raw materials is 5000 yuan / kg, but the output is small and the market deman...

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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