A method of purifying a synthetic diamond object

Abstract

This invention discloses a method for purifying artificially grown diamonds, comprising the following steps: Step 1, core heating, heating the material to 300℃-600℃; Step 2, rapid cooling, rapidly cooling the material to below 20℃; Step 3, vibration impact screening, screening different particles in a vibrating screen and using magnetic separation to remove internal metal materials; Step 4, surface adhesion removal, mixing the screened diamond separation with sawdust or rice husks at a ratio of 100:(1-10), repeatedly kneading for 0.5-5 hours, followed by screening; Step 5, surface attachment removal, ultrasonically cleaning the screened diamonds to remove surface attachments. This method for purifying artificially grown diamonds is completely different from traditional chemical processing methods. The entire process does not involve strong acid reactions, using a purely physical separation method for purification, effectively controlling costs and significantly reducing environmental pollution, making it suitable for mass production.

Description

Technical Field

[0001] This invention relates to the field of HTHP (Heat-to-Hydraulic Hydrodialysis) artificial diamond technology, specifically a method for purifying artificially grown diamonds. Background Technology

[0002] The development of lab-grown diamonds has been promising in recent years, with an increasing number of technicians working in this field and rapid technological advancements across all aspects. Significant breakthroughs have been made in areas such as material selection, structural design, and process matching, which are considered more technologically intensive. However, research on post-processing is still limited. Lab-grown diamonds, also known as laboratory-grown diamonds, are products produced in laboratories for mass production. Many aspects can be further optimized during mass production. Among these, the post-processing technology for synthetic cores urgently needs improvement. The post-processing technology for synthetic cores refers to the core containing the grown diamonds after synthesis. It is a carbon alloy core containing the grown diamonds. In the early laboratory stages, to quickly observe the state of the synthetic diamonds, the conventional method was to boil them at high temperatures using nitric acid, hydrochloric acid, sulfuric acid, perchloric acid, or a mixture of several acids. After 1-2 hours of reaction, the metal inside was corroded, leaving only the diamonds that did not react with the acid. Excess acid was then separated, and the diamonds were repeatedly washed with water to purify the lab-grown diamonds from the synthetic core. Later, during the market promotion phase, many manufacturers still used this relatively primitive, costly, risky, environmentally harmful, and inconsistent quality method for purification. Slightly larger companies might use electrolytic separation, which still involves adding chemicals such as hydrochloric acid and sulfuric acid. Therefore, most manufacturers' synthetic core purification technology currently falls under the category of chemical purification. This purification technology is a continuation and development of industrial diamond purification technology, almost identical to it, differing only in the size of the container used. This purification technology has the following characteristics:

[0003] 1. Significant Environmental Harm: Enterprises are increasingly committed to environmental protection and are investing more heavily in it. Traditional chemical purification methods use large amounts of strong acids, which cause significant environmental damage.

[0004] 2. High safety risks: Production safety is becoming increasingly important for the manufacturing industry. Traditional chemical purification methods use large amounts of strong acid, which poses extremely high safety risks to operators. There are risks of personal injury in the process of adding strong acid, boiling acid, and discharging acid.

[0005] 3. High production costs: Since the chemical method is a laboratory purification method, mass production consumes large amounts of strong acid, beakers, heating equipment, water resources, and water treatment resources. All of these factors increase production costs.

[0006] 4. Unstable quality: Because chemical purification involves the use of numerous containers in mass production, the acid-to-material ratio and boiling time are difficult to control precisely in different containers, leading to variations in the final results. Furthermore, residual acid is difficult to completely remove, resulting in significant differences in the surface color of the finished product. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method for purifying artificially grown diamonds that is completely different from the traditional chemical processing method. The entire process does not involve strong acids and uses a purely physical separation method for purification, which has significant effects, is suitable for mass production, and can effectively solve the problems in the background technology.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for purifying artificially grown diamond objects, comprising the following steps:

[0009] Step 1: Heating the core of the column to heat the entire material to a temperature of 300℃-600℃;

[0010] Step 2: Rapid cooling, rapidly cooling the material to below 20°C;

[0011] Step 3, Vibration impact screening: Different particles are screened in the vibrating screen, and magnetic separation is used to remove internal metal materials.

[0012] Step 4: Cleaning the surface adhesive. Mix the sieved diamond separation with sawdust or rice husks at a ratio of 100:(1-10), knead repeatedly for 0.5-5 hours, and then sieve.

[0013] Step 5: Cleaning surface deposits. The sieved diamonds are ultrasonically cleaned to remove surface deposits.

[0014] In a preferred embodiment of the present invention, the heating time in step one is 30-120 minutes.

[0015] As a preferred technical solution of the present invention, in step two, the temperature is reduced by immersion in cold water or by cooling with liquid nitrogen.

[0016] As a preferred embodiment of the present invention, in step four, the strong magnet used for magnetic separation is arranged at the downstream end of the screen, and the screen mesh size is larger than that of the diamond.

[0017] As a preferred embodiment of the present invention, in step four, the mixture is loaded into a mixer and rotated continuously at a speed of 60-100 rpm for 0.5-5 hours.

[0018] As a preferred technical solution of the present invention, in step five, the first step is to rinse the product with clean water, and then clean it in an ultrasonic cleaning device at a temperature of 30-60°C for 10-20 minutes, rinsing it with pure water 2-3 times, and then drying it.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present method for purifying artificially grown diamonds utilizes the excellent thermodynamic and physical properties of diamonds to separate diamonds from metal materials in the core. This method does not involve acid solutions and has less environmental harm.

[0020] Furthermore, the production process does not involve acid transfer, greatly improving operational safety and reliability and ensuring the personal safety of operators;

[0021] Compared to traditional chemical methods, this method involves only one heating and rapid cooling, resulting in lower overall energy consumption. It does not involve strong acid chemical reactions for separation, and there is no need to build a reaction environment. Overall production costs are effectively controlled, decreasing by more than 60%. Furthermore, the surface of the sieved diamonds is free of acidic substances, resulting in high-quality finished products that can directly reflect the original state of the extract.

[0022] Furthermore, the separated metal materials can be recycled and reused, further reducing production costs. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides a technical solution: a method for purifying artificially grown diamonds, comprising the following steps:

[0025] Step 1: Heating the core of the column to heat the entire material to a temperature of 300℃-600℃;

[0026] Step 2: Rapid cooling, rapidly cooling the material to below 20°C;

[0027] Step 3, Vibration impact screening: Different particles are screened in the vibrating screen, and magnetic separation is used to remove internal metal materials.

[0028] Step 4: Cleaning the surface adhesive. Mix the sieved diamond separation with sawdust or rice husks at a ratio of 100:(1-10), knead repeatedly for 0.5-5 hours, and then sieve.

[0029] Step 5: Cleaning surface deposits. The sieved diamonds are ultrasonically cleaned to remove surface deposits.

[0030] In step one, the heating time is 30-120 minutes.

[0031] In step two, the temperature is lowered by immersion in cold water or by cooling with liquid nitrogen.

[0032] In step four, the strong magnet used for magnetic separation is positioned at the downstream end of the screen, and the screen mesh size is larger than that of the diamond.

[0033] In step four, the mixture is loaded into a mixer and rotated continuously at a speed of 60-100 rpm for 0.5-5 hours.

[0034] In step five, first rinse with clean water, then clean in an ultrasonic cleaning device at a temperature of 30-60℃ for 10-20 minutes, rinse with pure water 2-3 times, and then dry.

[0035] Example:

[0036] 1. Take a number of diamond cores and place them in a suitable container. Put them in a high-temperature oven or other electric heating equipment and heat them at 300-600 degrees Celsius for 30-120 minutes.

[0037] 2. After the high-temperature insulation period is over, turn off the power, use a special clamp to remove the container containing the core at high temperature, and pour it into a cold water bucket to quickly cool the high-temperature core.

[0038] 3. After cooling, remove the cooled core. Due to the difference in thermal expansion coefficients between the metal and the diamond, rapid cooling will create many gaps at the junction of the core and the diamond. Some cores may even break into several small pieces or some diamonds may have fallen off naturally.

[0039] 4. Prepare an adjustable vibrator and connect it to a feeder with a ramp. Feed the material from step 3 into the upper part of the ramp, and place a strong magnet at the lower outlet to separate the metal and diamonds. Turn on the equipment. Due to the vibration, the cracks in the material will grow larger and larger, and the diamonds will gradually separate from the metal blocks. The smaller pieces of metal and diamonds that are separated out flow out of the outlet. The strong magnet separates the diamonds from the smaller pieces of metal.

[0040] 5. After a period of vibration, the diamond completely separates from the metal. However, a small amount of metal or graphite may remain on the grooves or uneven parts of the diamond surface. The diamond separation material from step 4 is then fed into a mixer containing sawdust or rice husks at a weight ratio of 100:(1-10) of sawdust or rice husks to diamonds from step 4. The machine is run at 60-100 rpm for 0.5-5 hours, and the diamonds are separated using a sieve.

[0041] 6. After step 5, the fine metal or graphite residue on the diamond surface has been cleaned, but some sawdust or rice husk dust remains. Rinse the item from step 5 with clean water; this will remove only a few impurities that were difficult to clean from the surface grooves.

[0042] 7. Place the item from step 6 into an ultrasonic cleaning device and clean it for 10-20 minutes at a temperature of 30-60 degrees Celsius. Remove it and rinse it 2-3 times with purified water, then place it in a drying oven to dry.

[0043] The synthetic core of industrial diamond is a monolithic sintered body of metal, graphite, and industrial diamond. Industrial diamonds are extremely small, ranging from micrometers to hundreds of micrometers, making pure physical purification difficult. However, the synthetic core of lab-grown diamond is a monolithic sintered body of metal and lab-grown diamond, and lab-grown diamonds are at least millimeter-sized or even centimeter-sized particles. Mechanical extrusion could be used to separate lab-grown diamonds; however, simple mechanical extrusion would damage the diamonds, making it counterproductive. Traditional chemical purification methods utilize the chemical stability of diamonds. Diamonds themselves possess excellent chemical properties and are also the hardest natural substance. The diamond is a high-quality material with an extremely low coefficient of thermal expansion (only (0.4-0.8)*10-6) in the temperature range of 193K-1200K, so sudden temperature changes have little effect on it) and high heat resistance (ignition point in air is 850-1000 degrees Celsius). Therefore, this method utilizes the difference in thermal expansion coefficients between diamond and other materials when the synthetic core is heated and then rapidly cooled, creating a gap between the diamond and the metal material. This gap is then separated from the metal material by external vibration, such as the action of a vibrating screen. The entire process does not involve strong acid reactions, effectively controlling production costs and environmental pollution.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for purifying artificially grown diamonds, characterized in that, Includes the following steps: Step 1: Heating the core of the synthesis column to heat the entire material to a temperature of 300℃-600℃; Step 2: Rapid cooling, rapidly cooling the material to below 20°C; Step 3, Vibration impact screening: Different particles are screened in the vibrating screen, and magnetic separation is used to remove internal metal materials. Step 4: Cleaning the surface adhesive. Mix the sieved diamond separation with sawdust or rice husks at a weight ratio of 100:(1-10), knead repeatedly for 0.5-5 hours, and then sieve. Step 5: Cleaning surface deposits. The sieved diamonds are ultrasonically cleaned to remove surface deposits.

2. The method for purifying artificially grown diamonds according to claim 1, characterized in that: In step one, the heating time is 30-120 minutes.

3. The method for purifying artificially grown diamonds according to claim 1, characterized in that: In step two, the temperature is lowered by immersion in cold water or by cooling with liquid nitrogen.

4. The method for purifying artificially grown diamonds according to claim 1, characterized in that: In step four, the strong magnet used for magnetic separation is positioned at the downstream end of the screen, and the screen mesh size is larger than that of the diamond.

5. The method for purifying artificially grown diamonds according to claim 1, characterized in that: In step four, the mixture is loaded into a mixer and rotated continuously at a speed of 60-100 rpm for 0.5-5 hours.

6. The method for purifying artificially grown diamonds according to claim 1, characterized in that: In step five, first rinse with clean water, then clean in an ultrasonic cleaning device at a temperature of 30-60℃ for 10-20 minutes, rinse with pure water 2-3 times, and then dry.