Sorting method for industrially synthesized diamonds

Abstract

The invention discloses an industrial synthetic diamond sorting method which comprises the following steps: S1, classification: screening diamonds, then selecting according to the state of the diamonds, adopting a multiple screening method for blocky diamonds, adopting a chemical screening method for powdery diamonds, or combining the multiple screening method and the chemical screening method for use; s2, screening and cleaning: screening diamonds, separating powder from blocky diamonds, putting diamond blocks with a certain volume into a cylindrical ore washer for cleaning, and recycling wastewater generated in cleaning for later use; according to the method, initial diamonds are preliminarily screened, then different sorting modes are carried out according to the states of the diamonds obtained through screening, the multiple screening method is adopted for blocky diamonds, the chemical screening method is adopted for powdery diamonds, or the multiple screening method and the chemical screening method are combined for use, so that the diamonds can be better sorted out; the precision is high and the sorting effect is good.

Description

Technical Field

[0001] The present invention relates to the field of diamond technology, and more specifically, to a method for sorting industrial synthetic diamonds. Background Art

[0002] Diamond is a superhard material with very high hardness, mainly used to make various diamond tools. Diamond tools or diamond components made of diamond are widely used in automobile, machinery, electronics, aerospace, aviation, optical instruments, glass, ceramics, petroleum and other industries. With the continuous development of technological products, its application fields are also constantly expanding, and the processing efficiency and processing accuracy have been improved by dozens or even hundreds of times. Before using diamond for processing, it is necessary to remove impurities in the diamond. At present, the diamond sorting process mainly adopts a single dry sorting or wet sorting, which leads to low production efficiency, low diamond accuracy after sorting, and many impurities. For this reason, we propose a sorting method for industrial synthetic diamond. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for sorting industrial synthetic diamonds.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for sorting industrial synthetic diamonds, comprising the following steps:

[0005] S1. Classification: Screen the diamonds and then select them according to their state. Block diamonds are screened by multiple screening methods, powder diamonds are screened by chemical screening methods, or a combination of the two methods.

[0006] S2, screening and cleaning: Screen the diamonds to separate the powder and block diamonds, put the diamond blocks of a certain volume into the drum ore washer for cleaning, and recycle the waste water generated during the cleaning for future use;

[0007] S3, multiple screening method:

[0008] (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks;

[0009] (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks;

[0010] (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation;

[0011] S4. Chemical screening method:

[0012] (1) preparing a dispersion: adding a dispersant to hot water and stirring thoroughly until the mixture is dissolved, while continuously raising the temperature during stirring to obtain a dispersion;

[0013] (2) adding a wetting agent: adding a wetting agent to the dispersion and stirring until dissolved to obtain a screening solution;

[0014] (3) Mixing and dissolving: adding diamond powder to the screening solution, stirring evenly, and heating to 66-75° C., and then keeping the temperature within the range of 55-65° C. after stirring and heating to obtain a diamond powder mixed solution;

[0015] (4) Centrifugal sorting: The diamond powder mixed solution is placed in a centrifugal sorting device. After the sorting is completed, the sorting result is judged whether it meets the standard. If it does not meet the standard, chemical screening is performed again until the result meets the standard, and finally dehydration and drying are performed.

[0016] Preferably, the dispersant is composed of sodium pyrophosphate, sodium tripolyphosphate, alkyl aryl phosphate, dialkyl sulfosuccinate, sorbitol alkylate and maleic anhydride copolymer.

[0017] Preferably, the dispersant is composed of 3-7 parts of sodium pyrophosphate, 5-11 parts of sodium tripolyphosphate, 2-6 parts of alkyl aryl phosphate, 4-8 parts of dialkyl sulfosuccinate, 8-13 parts of sorbitol alkylate and 1-5 parts of maleic anhydride copolymer.

[0018] Preferably, the wetting agent is composed of ethanol, glycerol, dimethyl sulfoxide, alkyl sulfate, sulfonate, and fatty acid ester sulfate.

[0019] Preferably, the wetting agent is composed of 12 to 16 parts of ethanol, 8 to 9 parts of glycerol, 4 to 7 parts of dimethyl sulfoxide, 1 to 3 parts of alkyl sulfate, 5 to 11 parts of sulfonate, and 3 to 5 parts of fatty acid ester sulfate.

[0020] Preferably, in step S4, when preparing the dispersion, first prepare hot water at 70°C, and the ratio of hot water to dispersant is 12:0.5, and the temperature is raised to 50-60°C during stirring.

[0021] Preferably, the ratio of the diamond powder to the screening solution is 1:2.5.

[0022] Technical effects and advantages of the present invention:

[0023] 1. The present invention performs preliminary screening on diamonds, and then performs different sorting methods according to the state of the diamonds obtained through screening. Multiple screening methods are used for block diamonds, and chemical screening methods are used for powdered diamonds, or the two sorting methods are used in combination. Different sorting methods are used according to the characteristics of diamonds during the sorting process to better sort out diamonds, with high accuracy and good sorting effect.

[0024] 2. The present invention uses a chemical screening method to disperse diamond powder to improve the sorting effect. At the same time, the dispersant and wetting agent of the present invention can improve the efficiency of powder dispersion, so as to better solve the problem of easy agglomeration of diamond powder. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] The present invention provides a technical solution: a method for sorting industrial synthetic diamonds, comprising the following steps:

[0028] S1. Classification: Diamonds are screened. Block diamonds are screened by multiple screening methods, powder diamonds are screened by chemical screening methods, or a combination of the two screening methods.

[0029] S2, screening and cleaning: Separate the diamond blocks and powders, and then select the sorting method according to the state of the diamonds. Put the diamond blocks of a certain volume into the drum washing machine for cleaning, and recycle the wastewater generated during the cleaning for future use;

[0030] S3, multiple screening method:

[0031] (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks;

[0032] (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks;

[0033] (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation;

[0034] S4. Chemical screening method:

[0035] (1) preparing a dispersion: selecting 3 parts of sodium pyrophosphate, 5 parts of sodium tripolyphosphate, 2 parts of alkyl aryl phosphate, 4 parts of dialkyl sulfosuccinate, 8 parts of sorbitol alkylate and 1 part of maleic anhydride copolymer, mixing them into a dispersant, adding the dispersant into hot water at 70° C., stirring thoroughly until dissolved, while heating the mixture during stirring, and keeping the mixture at 60° C. for 20 minutes after dissolution to obtain a dispersion;

[0036] (2) Adding a wetting agent: put 12 parts of ethanol, 8 parts of glycerol, 4 parts of dimethyl sulfoxide, 1 part of alkyl sulfate, 5 parts of sulfonate, and 3 parts of fatty acid ester sulfate into a mixer and mix them evenly, then add them into the dispersion in multiple portions and stir until dissolved to obtain a screening solution;

[0037] (3) Mixed dissolution: Add diamond powder to the screening solution several times and stir evenly. Heat it in multiple temperature stages. The first stage is heated to 50-60°C, the second stage is heated to 60-70°C, and the third stage is heated to 70-75°C. After stirring and dissolving, keep the temperature within the range of 55-65°C for 60 minutes to obtain a diamond powder mixed solution, in which the ratio of diamond powder to screening solution is 1:2.5.

[0038] (4) Centrifugal sorting: The diamond powder mixed solution is placed in a centrifugal sorting device and centrifuged at different speeds according to the particle size of the diamond powder. After the sorting is completed, the sorting result is judged to see whether it meets the standard. If it does not meet the standard, chemical screening is performed again until the result meets the standard, and finally dehydration and drying are performed.

[0039] Example 2

[0040] The present invention provides a technical solution: a method for sorting industrial synthetic diamonds, comprising the following steps:

[0041] S1. Classification: Diamonds are screened. Block diamonds are screened by multiple screening methods, powder diamonds are screened by chemical screening methods, or a combination of the two screening methods.

[0042] S2, screening and cleaning: Separate the diamond blocks and powders, and then select the sorting method according to the state of the diamonds. Put the diamond blocks of a certain volume into the drum washing machine for cleaning, and recycle the wastewater generated during the cleaning for future use;

[0043] S3, multiple screening method:

[0044] (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks;

[0045] (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks;

[0046] (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation;

[0047] S4. Chemical screening method:

[0048] (1) preparing a dispersion: selecting 5 parts of sodium pyrophosphate, 8 parts of sodium tripolyphosphate, 4 parts of alkyl aryl phosphate, 6 parts of dialkyl sulfosuccinate, 11 parts of sorbitol alkylate and 3 parts of maleic anhydride copolymer, mixing them into a dispersant, adding the dispersant into hot water at 70° C., stirring thoroughly until dissolved, while heating the mixture during stirring, and keeping the mixture at 60° C. for 20 minutes after dissolution to obtain a dispersion;

[0049] (2) Adding a wetting agent: put 14 parts of ethanol, 8 parts of glycerol, 6 parts of dimethyl sulfoxide, 2 parts of alkyl sulfate, 8 parts of sulfonate, and 4 parts of fatty acid ester sulfate into a mixer and mix them evenly, then add them into the dispersion in multiple portions and stir until dissolved to obtain a screening solution;

[0050] (3) Mixed dissolution: Add diamond powder to the screening solution several times and stir evenly. Heat it in multiple temperature stages. The first stage is heated to 50-60°C, the second stage is heated to 60-70°C, and the third stage is heated to 70-75°C. After stirring and dissolving, keep the temperature within the range of 55-65°C for 60 minutes to obtain a diamond powder mixed solution, in which the ratio of diamond powder to screening solution is 1:2.5.

[0051] (4) Centrifugal sorting: The diamond powder mixed solution is placed in a centrifugal sorting device and centrifuged at different speeds according to the particle size of the diamond powder. After the sorting is completed, the sorting result is judged to see whether it meets the standard. If it does not meet the standard, chemical screening is performed again until the result meets the standard, and finally dehydration and drying are performed.

[0052] Example 3

[0053] The present invention provides a technical solution: a method for sorting industrial synthetic diamonds, comprising the following steps:

[0054] S1. Classification: Diamonds are screened. Block diamonds are screened by multiple screening methods, powder diamonds are screened by chemical screening methods, or a combination of the two screening methods.

[0055] S2, screening and cleaning: Separate the diamond blocks and powders, and then select the sorting method according to the state of the diamonds. Put the diamond blocks of a certain volume into the drum washing machine for cleaning, and recycle the wastewater generated during the cleaning for future use;

[0056] S3, multiple screening method:

[0057] (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks;

[0058] (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks;

[0059] (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation;

[0060] S4. Chemical screening method:

[0061] (1) preparing a dispersion: 7 parts of sodium pyrophosphate, 11 parts of sodium tripolyphosphate, 6 parts of alkyl aryl phosphate, 8 parts of dialkyl sulfosuccinate, 13 parts of sorbitol alkylate and 5 parts of maleic anhydride copolymer are selected and mixed to form a dispersant, and the dispersant is added into hot water at 70° C. and stirred thoroughly until dissolved. The temperature is increased during the stirring process, and after dissolution, the temperature is kept at 60° C. for 20 minutes to obtain a dispersion;

[0062] (2) Adding a wetting agent: 16 parts of ethanol, 9 parts of glycerol, 7 parts of dimethyl sulfoxide, 3 parts of alkyl sulfate, 11 parts of sulfonate, and 5 parts of fatty acid ester sulfate are mixed in a mixer, and then added to the dispersion in multiple portions and stirred until dissolved to obtain a screening solution;

[0063] (3) Mixed dissolution: Add diamond powder to the screening solution several times and stir evenly. Heat it in multiple temperature stages. The first stage is heated to 50-60°C, the second stage is heated to 60-70°C, and the third stage is heated to 70-75°C. After stirring and dissolving, keep the temperature within the range of 55-65°C for 60 minutes to obtain a diamond powder mixed solution, in which the ratio of diamond powder to screening solution is 1:2.5.

[0064] (4) Centrifugal separation: The diamond powder mixed solution is placed in a centrifugal separation device, and can be centrifuged at different speeds according to the particle size of the diamond powder, and finally dehydrated and dried;

[0065] The diamond powder mixed solution with a median value of 0.10-0.20 μm is centrifuged and sorted. The centrifugal speed is set to 3000-3500 rpm and the time is 600-800 s. After centrifugation, the suspension in the cup is completely poured out. The fine powder precipitated at the bottom of the cup is repeated with the above (3) mixed and dissolved step. The centrifugal speed and time are adjusted again. After centrifugation, the flowing liquid in the cup is still completely poured out. Repeat 1-2 times to completely sort out the diamond powder.

[0066] The diamond powder mixed solution with a median value of 0.30-0.40 μm is centrifuged and sorted. The centrifugal speed is set to 2600-3000 rpm and the time is 500-800 s. After centrifugation, the suspension in the cup is completely poured out. The fine powder precipitated at the bottom of the cup is repeated with the above (3) mixed and dissolved step. The centrifugal speed and time are adjusted again. After centrifugation, the flowing liquid in the cup is still completely poured out. Repeat 1-2 times to completely sort out the diamond powder.

[0067] The diamond powder mixed solution with a median of 0.50-0.65 μm is centrifuged and sorted. The centrifugal speed is set at 1800-2100 rpm and the time is 370-630 s. After centrifugation, the suspension in the cup is completely poured out. The fine powder precipitated at the bottom of the cup is repeated with the above (3) mixed and dissolved step. The centrifugal speed and time are adjusted again. After centrifugation, the flowing liquid in the cup is still completely poured out. Repeat 1-2 times to completely sort out the diamond powder.

[0068] Example 4

[0069] S1. Screening and cleaning: Separate the diamond blocks and powders, and then select the sorting method according to the state of the diamonds. Put the diamond blocks of a certain volume into the drum washing machine for cleaning, and recycle the wastewater generated during the cleaning for future use;

[0070] S2. Multiple screening method:

[0071] (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks;

[0072] (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks;

[0073] (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation;

[0074] S3. Chemical screening method:

[0075] (1) preparing a dispersion: selecting 6 parts of sodium pyrophosphate, 11 parts of sodium tripolyphosphate, 5 parts of alkyl aryl phosphate, 8 parts of dialkyl sulfosuccinate, 10 parts of sorbitol alkylate and 1-5 parts of maleic anhydride copolymer, mixing them into a dispersant, adding the dispersant into hot water at 70° C., stirring thoroughly until dissolved, while heating the mixture during stirring, and keeping the mixture at 60° C. for 20 minutes after dissolution to obtain a dispersion;

[0076] (2) Adding a wetting agent: 16 parts of ethanol, 9 parts of glycerol, 6 parts of dimethyl sulfoxide, 3 parts of alkyl sulfate, 9 parts of sulfonate, and 4 parts of fatty acid ester sulfate are mixed in a mixer, and then added to the dispersion in multiple portions and stirred until dissolved to obtain a screening solution;

[0077] (3) Extracting diamond powder from wastewater: The wastewater generated during cleaning is precipitated, and after the precipitation is completed, the precipitate is dried and the diamond powder is extracted, and then dried for later use, and the dried diamond powder is mixed with the diamond powder from the screening stage;

[0078] (4) Mixed dissolution: Add diamond powder to the screening solution several times and stir evenly. Heat it in multiple temperature stages. The first stage is heated to 50-60°C, the second stage is heated to 60-70°C, and the third stage is heated to 70-75°C. After stirring and dissolving, keep the temperature within the range of 55-65°C for 60 minutes to obtain a diamond powder mixed solution, in which the ratio of diamond powder to screening solution is 1:2.5.

[0079] (5) Centrifugal sorting: The diamond powder mixed solution is placed in a centrifugal sorting device and centrifuged at different speeds according to the particle size of the diamond powder. After the sorting is completed, the sorting result is judged to see whether it meets the standard. If it does not meet the standard, chemical screening is performed again until the result meets the standard, and finally dehydration and drying are performed.

[0080] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for sorting industrial synthetic diamonds, characterized in that: The steps include: S1. Classification: Screen the diamonds and then select them according to their state. Block diamonds are screened by multiple screening methods, powder diamonds are screened by chemical screening methods, or a combination of the two methods. S2, screening and cleaning: Screen the diamonds to separate the powder and block diamonds, put the diamond blocks of a certain volume into the drum ore washer for cleaning, and recycle the waste water generated during the cleaning for future use; S3, multiple screening method: (1) Preliminary screening: The diamond blocks are preliminarily screened by gravity separation to remove easily distinguishable impurities and obtain primary diamond blocks; (2) Optical sorting: The obtained primary diamond blocks are sorted again using optical sorting equipment to remove most of the impurities and obtain selected diamond blocks; (3) X-ray electric separation: the selected diamond blocks are screened in an X-ray device to remove impurities, and the diamond blocks are turned over during X-ray irradiation; S4. Chemical screening method: (1) preparing a dispersion: adding a dispersant to hot water and stirring thoroughly until the mixture is dissolved, while continuously raising the temperature during stirring to obtain a dispersion; (2) adding a wetting agent: adding a wetting agent to the dispersion and stirring until dissolved to obtain a screening solution; (3) Mixing and dissolving: adding diamond powder to the screening solution, stirring evenly, and heating to 66-75° C., and then keeping the temperature within the range of 55-65° C. after stirring and heating to obtain a diamond powder mixed solution; (4) Centrifugal sorting: The diamond powder mixed solution is placed in a centrifugal sorting device. After the sorting is completed, the sorting result is judged whether it meets the standard. If it does not meet the standard, chemical screening is performed again until the result meets the standard, and finally dehydration and drying are performed.

2. The method for separating industrial synthetic diamonds according to claim 1, characterized in that: The dispersant consists of sodium pyrophosphate, sodium tripolyphosphate, alkyl aryl phosphate, dialkyl sulfosuccinate, sorbitol alkylate and maleic anhydride copolymer.

3. The method for separating industrial synthetic diamonds according to claim 2, characterized in that: The dispersant is composed of 3-7 parts of sodium pyrophosphate, 5-11 parts of sodium tripolyphosphate, 2-6 parts of alkyl aryl phosphate, 4-8 parts of dialkyl sulfosuccinate, 8-13 parts of sorbitol alkylate and 1-5 parts of maleic anhydride copolymer.

4. The method for separating industrial synthetic diamonds according to claim 1, characterized in that: The wetting agent consists of ethanol, glycerol, dimethyl sulfoxide, alkyl sulfate, sulfonate and fatty acid ester sulfate.

5. The method for separating industrial synthetic diamonds according to claim 4, characterized in that: The wetting agent consists of 12 to 16 parts of ethanol, 8 to 9 parts of glycerol, 4 to 7 parts of dimethyl sulfoxide, 1 to 3 parts of alkyl sulfate, 5 to 11 parts of sulfonate and 3 to 5 parts of fatty acid ester sulfate.

6. The method for separating industrial synthetic diamonds according to claim 1, characterized in that: In step S4, when preparing the dispersion, first prepare hot water at 70°C, and the ratio of hot water to dispersant is 12:0.5, and the temperature is raised to 50-60°C during stirring. The method for sorting industrial synthetic diamonds according to claim 1 is characterized in that: The ratio of the diamond powder to the screening solution is 1:2.5.