CN109264711B - Diamond recovery method, device and application without discharging nitrogen oxide - Google Patents
Diamond recovery method, device and application without discharging nitrogen oxide Download PDFInfo
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- CN109264711B CN109264711B CN201811452213.2A CN201811452213A CN109264711B CN 109264711 B CN109264711 B CN 109264711B CN 201811452213 A CN201811452213 A CN 201811452213A CN 109264711 B CN109264711 B CN 109264711B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/25—Diamond
- C01B32/28—After-treatment, e.g. purification, irradiation, separation or recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a diamond recovery device without discharging nitrogen oxide, which comprises a feeding absorption tower, a corrosion reaction kettle, a storage tank, an overflow tank and a cooling aeration tower. The upper end of the corrosion reaction kettle is connected with a pipeline I with an air valve, and the outlet end of the pipeline I is connected to the side wall of the lower end of the feeding absorption tower. Two ends of the side wall of the bottom of the corrosion reaction kettle are respectively provided with a pipeline II and a pipeline III with a liquid discharge valve. The pipeline II is connected with the bottom of the feeding absorption tower, and the pipeline III is connected with the storage tank; the side of the bottom of the storage tank is connected to a spray head through a pipeline V, the spray head is arranged above the feeding absorption tower, and a pump is arranged on the pipeline V. The bottom of the corrosion reaction kettle is connected to an overflow groove through a pipeline IV, an overflow port is formed in the side wall of the overflow groove, the overflow port is connected to a spray head through a pipeline VI, the spray head is arranged above a cooling aeration tower, and an exhaust fan is further arranged above the spray head. The invention utilizes the reaction kettle with closed design, adopts a circulating absorption mode to improve the absorption efficiency, and realizes the recovery of the diamond without discharging nitrogen oxide.
Description
Technical Field
The invention belongs to the recovery treatment of three wastes in chemical production, and particularly relates to a method, a device and application for recovering diamond without discharging nitrogen oxide.
Background
Diamond is commonly called "diamond" and is an allotrope of carbon element. Diamond is the most rigid of the many naturally occurring substances currently found on earth. Graphite can form synthetic diamond at high temperature and high pressure. The artificial diamond is mainly used for manufacturing cutting and drilling tools. China is a large country for producing and using diamond and diamond tools, consumes a large amount of diamond each year, and also generates a large amount of diamond waste products. Diamond tools are an integral body in which diamond particles are firmly bonded into different shapes by bonding metals such as copper, iron, and the like. The diamond recovery is generally to etch and dissolve the bonding metals such as copper, iron and the like in the waste products of the diamond tools by nitric acid-containing liquid, and filter the bonding metals to obtain diamond particles.
The existing technology generally adopts a powerful exhaust fan to enable a reaction kettle for generating nitrogen oxide to be in a negative pressure state for sucking excessive air, and the nitrogen oxide and the air in the kettle are sent into absorption towers with the height of tens of meters or multiple stages to be connected in series for absorption, so that the environment protection requirement is still difficult to be achieved. The existing process has the problems of nitrogen oxide pollution to the environment, low nitric acid utilization rate, high absorption equipment cost and the like.
Disclosure of Invention
Aiming at the defects of the prior art of nitrogen oxide waste gas treatment in diamond recovery, the invention provides a method, a device and an application for diamond recovery, which can reduce the pollution of nitrogen oxide tail gas, improve the utilization rate of nitric acid and reduce the equipment cost.
The technical scheme provided by the invention is as follows:
a diamond recovery device without discharging nitrogen oxide comprises a feeding absorption tower (20), a corrosion reaction kettle (10), a storage tank (52), an overflow tank (30) and a cooling aeration tower (40).
The upper end of the corrosion reaction kettle (10) is connected with a pipeline I (61) with an air valve (11), and the outlet end of the pipeline I (61) is connected to the side wall of the lower end of the feeding absorption tower (20); two ends of the side wall of the bottom of the corrosion reaction kettle (10) are respectively provided with a pipeline II (62) and a pipeline III (63) with a liquid discharge valve (13); a pipeline II (62) is connected with the bottom of the feeding absorption tower (20), and a pipeline III (63) is connected with the storage tank (52).
The side of the bottom of the storage tank (52) is provided with a liquid outlet, the liquid outlet is connected to a second spray head (51) through a pipeline V (65), the second spray head (51) is arranged above the feeding absorption tower (20), and a power pump (50) is arranged on the pipeline V (65).
The bottom of the corrosion reaction kettle (10) is connected to the bottom of the overflow groove (30) through a pipeline IV (64), an overflow port is formed in the side wall of the overflow groove (30), the overflow port is connected to a first spray head (42) through a pipeline VI (66), the first spray head (42) is arranged above the cooling aeration tower (40), and an exhaust fan (41) is further arranged above the first spray head (42).
The corrosion reaction kettle (10) is characterized in that the top of the corrosion reaction kettle is provided with a kettle cover, and the lower part of the corrosion reaction kettle is provided with a grid plate. The grid is used to stack diamond tool waste.
The top of the feeding absorption tower (20) is open, and a first filler (21) is arranged in the feeding absorption tower.
The upper end and the lower end of the cooling aeration tower (40) are both of an open design, and second packing (43) is filled in the cooling aeration tower.
Another object of the present invention is to provide a method for recovering diamond without discharging nitrogen oxide using the above apparatus, comprising the steps of:
1. in a speed-controlled corrosion reaction kettle, corroding diamond tool waste by using dilute nitric acid to generate nitric oxide, further reacting the nitric oxide with dissolved oxygen in the dilute nitric acid and exhausting the nitric oxide to generate nitrogen dioxide, reacting the nitrogen dioxide with water to generate nitric oxide and nitric acid, and obtaining a final solution which is hot dilute nitric acid and salt solution containing the nitric oxide;
2. leading hot nitric acid and salt solution containing nitric oxide out of the corrosion reaction kettle, cooling and aerating through a cooling aeration tower, wherein the contact area of gas and liquid is increased by the aeration tower, oxygen in air reacts with nitric oxide in the solution and is exhausted, and finally cold nitric acid and salt solution containing oxygen are formed;
3. introducing cold oxygen-containing nitric acid and salt solution into a corrosion reaction kettle through a feeding absorption tower, absorbing nitric oxide to generate nitric acid, continuously corroding diamond tool waste materials, and finally forming hot nitric acid and salt solution containing nitric oxide;
4. and (3) circulating the steps 2 and 3 until the reaction is completed, and finally, completely reacting the diamond tool waste, and recycling the diamond.
The invention also provides application of the diamond recovery device in diamond recovery without discharging nitrogen oxide.
The circulation path of the device provided by the invention is as follows:
the diamond tool waste reacts with nitric acid to produce nitric oxide, mainly nitric oxide, which enters a feed absorption tower 20 through a gas valve 11 and is circularly absorbed by cold oxygen saturated nitric acid and salt-containing reaction liquid. By adjusting the air valve 11, the flow of the nitrogen oxide gas can be slightly smaller than the absorption rate, so that the nitrogen oxide gas is prevented from being discharged and polluting the environment.
The diamond tool waste reacts with dilute nitric acid to generate nitrogen nitride gas, and the nitrogen oxide, mainly nitric oxide, reacts with dissolved oxygen in the reaction liquid in the rising process to generate hot nitric oxide saturated nitrate-containing reaction liquid without dissolved oxygen. Less than the reacted and absorbed nitrogen oxides, the reaction liquid is gathered above the reaction liquid in the corrosion reaction kettle 10, is pressed into the overflow groove 30, is sprayed onto the surface of the filler 43 through the first spray nozzle 42 and then flows into the storage tank 52, the liquid in the storage tank 52 is pumped out by the power pump 50, is sprayed through the second spray nozzle 51, flows along the surface of the first filler 21 at the upper part of the feeding absorption tower 20, and enters the corrosion reaction kettle 10 through the lower part of the feeding absorption tower 20. In the process of operating the power pump 50, the liquid flows circularly through the power pump 50, the second spray nozzle 51, the feeding absorption tower 20, the corrosion reaction kettle 10, the overflow tank 30, the second spray nozzle 51, the cooling aeration tower 40 and the storage tank 52 in sequence.
Air enters the cooling aeration tower 40 from the bottom, rises to the top of the tower along gaps of the packing 43, and is pumped out by the exhaust fan 41; during the contact of the rising air with the liquid flowing over the surface of the packing 43, the liquid is cooled and the gas is heated, oxygen in the air dissolves into the liquid, depleting nitric oxide in the liquid, and forming an oxygen saturated solution.
The invention adopts the following technical measures to realize zero emission of nitrogen oxide:
1. automatic control of corrosion reaction rate
The existing process does not control the reaction speed, and when the production speed of the nitrogen oxide exceeds the absorption speed, the nitrogen oxide is directly emptied, so that the environment is polluted. The invention adopts a closed reaction kettle to control the reaction speed. When the generation speed of the nitrogen oxide exceeds the absorption speed, the nitrogen oxide is accumulated above the liquid level of the corrosion reaction kettle (10), so that the liquid level is reduced, the contact area between the nitric acid liquid and the diamond tool waste is reduced, and the generation speed of the nitrogen oxide is reduced; when the nitrogen oxide generation rate is lower than the absorption rate, the volume of nitrogen oxide accumulated above the liquid level of the corrosion reaction kettle (10) is reduced, the liquid level is increased, the contact area between the nitric acid-containing liquid and the diamond tool waste is increased, and the nitrogen oxide generation rate is increased. When the absorption is stopped, the liquid level of the reaction liquid drops below the diamond tool waste, the liquid-solid phase contact area of the reaction liquid and the diamond tool waste drops to zero, and the reaction is stopped. By controlling the production rate of the nitrogen oxide, the production and absorption of the nitrogen oxide are automatically synchronous, and the nitrogen oxide cannot escape due to the excessive nitrogen oxide.
2. Enclosed absorbent system
The existing technology mixes the generated nitrogen oxide with air in an open system and then absorbs the mixed nitrogen oxide with absorption liquid. The process circularly absorbs the generated nitric oxide by using cold nitric acid containing oxygen and a salt solution thereof in a closed system, namely, absorption of nitric oxide is carried out in a liquid phase environment, so that the mixing of the nitric oxide and air is avoided, and the problems of air pollution caused by the air that nitrogen oxide is carried by inert gas nitrogen and the like in the air is not existed; the problems of huge cost of absorption equipment caused by reduction of absorption speed due to dilution of nitrogen oxide by inert gas nitrogen in air and the like are avoided. At the same time, when the nitric acid and the salt solution containing nitric oxide are subjected to aeration cooling, the absorption speed of oxygen can be improved to a certain extent due to the existence of nitric oxide, and the gas-liquid exchange speed is accelerated. The use of absorption liquid is avoided, and the problem of water pollution caused by the discharge of absorption wastewater is avoided; there is no cost of purchasing the absorbent liquid.
The existing process is compared with the process absorption route of the invention:
1. nitrogen oxide absorption pathway in existing technology
The absorption route adopted by the current technology is as follows: the nitric oxide reacts with oxygen in the air to become nitrogen dioxide which is absorbed by the absorption liquid.
The method comprises three steps: in the step 1, the metal surface is contacted and reacted with dilute nitric acid in the reaction liquid to generate nitric oxide. Step 2, in the beginning, in the rising process of nitric oxide, the nitric oxide reacts with dissolved oxygen of the reaction solution, and bubbles gradually decrease and disappear; after the dissolved oxygen is consumed, the nitric oxide gas floats to the liquid surface, is mixed with air, reacts with oxygen, and becomes mixed gas containing nitrogen dioxide, and the mixed gas is continuously led out of the reaction kettle. And 3, absorbing nitrogen dioxide by the absorption liquid. Step 3, the speed is the slowest, and the speed of the whole process is determined. In step 3, nitrogen dioxide diffuses from the gas phase bulk to the gas-liquid phase interface, combining with water to produce nitrogen dioxide hydrate; nitrogen dioxide hydrate collides in the way of diffusing from the gas-liquid phase interface to the liquid phase main body to generate nitric acid and nitric oxide; nitric acid continues to diffuse to the liquid phase main body, nitric oxide gathers into bubbles to float up and enter the gas phase. The absorption rate of this pathway can be expressed by the following formula:
first absorption pathway rate = gas-liquid phase contact area x absorption driving force/absorption resistance (1)
In formula 1, the absorption driving force = gas phase bulk nitrogen dioxide partial pressure-nitrogen dioxide partial pressure balanced with liquid phase concentration.
The above approach adopted in the existing technology has the following problems because nitric oxide reacts with oxygen in gas phase firstly and more than two gases are mixed: 1. the mixed gas can not completely react in the liquid phase, tail gas with inert gas and excessive oxygen can escape, and the escaped gas can entrain nitrogen oxide to cause air pollution; 2. the nitrogen oxide is diluted by inert gas nitrogen in the air, etc., so that the diffusion distance is prolonged, the diffusion resistance is increased, the absorption speed is reduced, and the defect is required to be compensated by increasing the number of tower plates, thereby increasing the equipment cost.
2. Absorption route of nitrogen oxide in the process of the invention
The inventors observed the phenomenon of nitric oxide binding with dissolved oxygen in water during experiments in which dilute nitric acid corroded metals. The nitric oxide bubbles generated on the surface of the metal block can be seen when the metal block is put into the bottom of the dilute nitric acid, and the bubbles are combined with dissolved oxygen in the floating process and gradually reduced until the bubbles disappear. After the reaction is carried out for a period of time and dissolved oxygen is consumed, no phenomenon of bubble reduction or even disappearance is observed. If hydrogen peroxide is added into dilute nitric acid, the bubble disappearance phenomenon is more obvious. If the concentration of the added hydrogen peroxide reaches more than 50%, the phenomenon that the nitrogen oxide gas overflows out of the liquid surface can not be observed in the whole reaction process. Based on this, the inventors unexpectedly opened up another new absorption route, namely that the absorption of nitric oxide is completely carried out in a liquid phase environment, which can effectively avoid the defect of route one, namely, the liquid phase absorption route.
The liquid phase absorption route is divided into three steps: in the step 1, the metal surface is contacted and reacted with dilute nitric acid in the reaction liquid to generate nitric oxide. Step 2, in the beginning, in the rising process of nitric oxide, the nitric oxide reacts with dissolved oxygen of the reaction solution, and bubbles gradually decrease and disappear; after the dissolved oxygen is consumed, nitric oxide gas floats on the reaction liquid surface and is absorbed by the continuously entering reaction liquid rich in dissolved oxygen. And 3, continuously leading out the reaction liquid which is completely consumed with dissolved oxygen from the reaction kettle for aeration, and continuously returning the reaction liquid which is changed into the reaction kettle rich in dissolved oxygen. Step 3 is the slowest and determines the rate of the process. This pathway absorption rate can be expressed by the following formula:
liquid phase absorption pathway rate = aeration area x oxygen dissolution driving force/oxygen dissolution resistance (2)
In formula 2, oxygen dissolution driving force=saturated concentration of liquid-phase oxygen balanced with gas-phase oxygen partial pressure-concentration of liquid-phase main oxygen.
The combination of nitric oxide and dissolved oxygen in water reduces the concentration of the oxygen in the liquid phase main body to be close to zero, so that the dissolution driving force is greatly increased, and finally the absorption rate of the liquid phase main body is accelerated.
Therefore, the absorption of nitric oxide is completely carried out in the liquid phase by adopting a liquid phase absorption method, the condition that inert gas generates resistance when gas molecules are diffused does not exist, and the problem of gas entrainment does not exist.
The invention has the beneficial effects that:
1. the reaction kettle with closed design is utilized to automatically control the corrosion reaction speed to be consistent with the nitric oxide absorption speed, so that the oxidation emission speed is basically equivalent to the reaction absorption speed, and no nitric oxide is emitted;
2. the nitrogen oxide is directly absorbed in the liquid phase by utilizing the combination of an aeration system, a circulating system and a closed system, no tail gas is discharged, and the entrainment pollution of inert gas is effectively avoided:
3. the invention uses cold oxygen-containing reaction liquid to replace water or alkali liquid as absorbent, and adopts a circulating absorption mode, thereby avoiding the discharge of acid or salt wastewater generated by absorbing nitrogen oxide by water or alkali liquid and avoiding the cost of purchasing water or alkali;
4. the effective control of the corrosion reaction speed avoids huge investment to establish absorption equipment to meet the requirement of treating nitrogen oxide in the reaction peak period, thereby reducing the equipment cost.
Drawings
Fig. 1 is a schematic view of a diamond recovery device that does not emit nitrogen oxides.
Reference numerals: 10-corroding the reaction kettle; 11-an air valve; 12-diamond tool waste; 13-a drain valve; 20-a charging absorption tower; 21-a first filler; 30-an overflow trough; 40-cooling an aeration tower; 41-exhaust fan; 42-first spray head; 43-a second filler; 50-a power pump; 51-a second spray head; 52-sump, line I-61, line II-62, line III-63, line IV-64, line V-65, line VI-66.
Detailed Description
The present invention will be described with reference to specific examples, but the present invention is not limited thereto at all.
Example 1
A diamond recovery device without discharging nitrogen oxide comprises a feeding absorption tower 20, a corrosion reaction kettle 10, a storage tank 52, an overflow tank 30 and a cooling aeration tower 40.
The corrosion reaction kettle 10 is of a closed structure, a kettle cover is arranged at the top, and a grid plate is arranged at the lower part and used for stacking diamond tool waste 12. The upper end of the corrosion reaction kettle 10 is connected with a pipeline I61 with a gas valve 11, and the outlet end of the pipeline I61 is connected to the side wall of the lower end of the feeding absorption tower 20. The top of the charging absorption tower 20 is open, and a first packing 21 is arranged inside the charging absorption tower. The two ends of the side wall of the bottom of the corrosion reaction kettle 10 are respectively provided with a pipeline II 62 and a pipeline III 63 with a liquid discharge valve 13. A line II 62 is connected to the bottom of the feed absorber 20 and a line III 63 is connected to the sump 52. The bottom side of the storage tank 52 is provided with a liquid outlet, the liquid outlet is connected to the second spray head 51 through a pipeline V65, the second spray head 51 is arranged above the feeding absorption tower 20, and the pipeline V65 is provided with a power pump 50.
The bottom of the corrosion reaction kettle 10 is connected to the bottom of the overflow tank 30 through a pipeline IV 64, an overflow port is formed in the side wall of the overflow tank 30, the overflow port is connected to a first spray head 42 through a pipeline VI 66, the first spray head 42 is arranged above the cooling aeration tower 40, and an exhaust fan 41 is further arranged above the first spray head 42. The cooling aeration tower 40 has an open design at the upper and lower ends and is filled with a second packing 43.
Application example 1
Step 1: firstly adding 9 tons of 33% nitric acid into a storage tank 52, then adding 1 ton of diamond tool waste into a corrosion reaction kettle 10, then covering a kettle cover, and finally closing an air valve 11 and a liquid discharge valve 13;
step 2: starting the power pump 50 and the exhaust fan 41;
step 3: slowly opening the air valve 11, and slightly adjusting the air valve 11 when red smoke emerges above the charging absorption tower 20; if the bubbles disappear in the middle of the feed absorption tower 20, the atmosphere valve 11 is slightly adjusted;
step 4: when the liquid is filled in the corrosion reaction kettle 10, namely the corrosion reaction is finished, the power pump 50 and the exhaust fan 41 are closed, the liquid discharge valve 13 is opened to discharge the liquid, and finally the kettle cover is opened to take out the diamond particles.
During the whole reaction process, no escape of red gas was observed, indicating that no escape of nitrogen oxide was observed by the reaction with the device.
Application example 2
Step 1: firstly, adding 3 tons of 33% nitric acid and 6 tons of 30% hydrochloric acid into a storage tank 52, then adding 1 ton of diamond tool waste into a corrosion reaction kettle 10, then covering a kettle cover, and finally closing an air valve 11 and a liquid discharge valve 13;
step 2: starting the power pump 50 and the exhaust fan 41;
step 3: slowly opening the air valve 11, and slightly adjusting the air valve 11 when red smoke emerges above the charging absorption tower 20; if the bubbles disappear in the middle of the feed absorption tower 20, the atmosphere valve 11 is slightly adjusted;
step 4: when the liquid is filled in the corrosion reaction kettle 10, namely the corrosion reaction is finished, the power pump 50 and the exhaust fan 41 are closed, the liquid discharge valve 13 is opened to discharge the liquid, and finally the kettle cover is opened to take out the diamond particles.
During the whole reaction process, no escape of red gas was observed, indicating that no escape of nitrogen oxide was observed by the reaction with the device.
Application example 3
Step 1: adding 4.5 tons of 33% nitric acid and 4.5 tons of 30% hydrochloric acid into a storage tank 52, adding 1 ton of diamond tool waste into the corrosion reaction kettle 10, covering a kettle cover, and finally closing an air valve 11 and a liquid discharge valve 13;
step 2: starting the power pump 50 and the exhaust fan 41;
step 3: slowly opening the air valve 11, and slightly adjusting the air valve 11 when red smoke emerges above the charging absorption tower 20; if the bubbles disappear in the middle of the feed absorption tower 20, the atmosphere valve 11 is slightly adjusted;
step 4: when the liquid is filled in the corrosion reaction kettle 10, namely the corrosion reaction is finished, the power pump 50 and the exhaust fan 41 are closed, the liquid discharge valve 13 is opened to discharge the liquid, and finally the kettle cover is opened to take out the diamond particles.
During the whole reaction process, no escape of red gas was observed, indicating that no escape of nitrogen oxide was observed by the reaction with the device.
The present invention is not limited to the above-mentioned embodiments, but any modifications, equivalents, improvements and modifications within the scope of the invention will be apparent to those skilled in the art.
Claims (4)
1. A diamond recovery device that does not emit nitrogen oxide, characterized in that:
comprises a feeding absorption tower (20), a corrosion reaction kettle (10), a storage tank (52), an overflow tank (30) and a cooling aeration tower (40);
the upper end of the corrosion reaction kettle (10) is connected with a pipeline I (61) with an air valve (11), and the outlet end of the pipeline I (61) is connected to the side wall of the lower end of the feeding absorption tower (20); two ends of the side wall of the bottom of the corrosion reaction kettle (10) are respectively provided with a pipeline II (62) and a pipeline III (63) with a liquid discharge valve (13); the pipeline II (62) is connected with the bottom of the feeding absorption tower (20), and the pipeline III (63) is connected with the storage tank (52); the top of the corrosion reaction kettle (10) is provided with a kettle cover, and the lower part of the corrosion reaction kettle is provided with a grid plate; the upper end and the lower end of the cooling aeration tower (40) are both open, and the second filler (43) is filled in the cooling aeration tower;
a liquid outlet is formed in the side face of the bottom of the storage tank (52), the liquid outlet is connected to a second spray head (51) through a pipeline V (65), the second spray head (51) is arranged above the feeding absorption tower (20), and a power pump (50) is arranged on the pipeline V (65);
the bottom of the corrosion reaction kettle (10) is connected to the bottom of the overflow groove (30) through a pipeline IV (64), an overflow port is formed in the side wall of the overflow groove (30), the overflow port is connected to a first spray head (42) through a pipeline VI (66), the first spray head (42) is arranged above the cooling aeration tower (40), and an exhaust fan (41) is further arranged above the first spray head (42).
2. A diamond recovery device according to claim 1, wherein: the top of the feeding absorption tower (20) is open, and a first filler (21) is arranged in the feeding absorption tower.
3. A method for recovering diamond without discharging nitrogen oxide by using the apparatus of claim 1, comprising the steps of:
(1) In a corrosion reaction kettle, dilute nitric acid corrodes diamond tool waste to generate nitric oxide, the nitric oxide further reacts with dissolved oxygen and is exhausted to generate nitrogen dioxide, the nitrogen dioxide reacts with water to generate nitric oxide and nitric acid, and the final solution is hot nitric acid containing nitric oxide and a salt solution thereof;
(2) Introducing hot nitric acid containing nitric oxide and a salt solution thereof from the corrosion reaction kettle, performing aeration cooling through an aeration cooling tower to dissolve oxygen in air into a liquid phase, and forming cold nitric acid containing oxygen and a salt solution thereof after the dissolved nitric oxide is exhausted;
(3) Introducing cold oxygen-containing nitric acid and a salt solution thereof into a corrosion reaction kettle through a feeding absorption tower, absorbing nitric oxide by the oxygen-containing nitric acid and the salt solution thereof, corroding diamond tool waste materials by the nitric acid, and finally forming hot nitric acid and the salt solution thereof;
(4) And (3) circulating the steps (2) and (3) until the reaction is completed, and finally, completely reacting the diamond tool waste and recycling the diamond.
4. Use of a diamond recovery device according to claim 1 or 2 for diamond recovery without nitrogen oxide emissions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811452213.2A CN109264711B (en) | 2018-11-30 | 2018-11-30 | Diamond recovery method, device and application without discharging nitrogen oxide |
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| CN201811452213.2A CN109264711B (en) | 2018-11-30 | 2018-11-30 | Diamond recovery method, device and application without discharging nitrogen oxide |
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| CN109264711B true CN109264711B (en) | 2023-10-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645406A (en) * | 2014-12-04 | 2016-06-08 | 曾舟华 | Recovery method of diamond |
| CN107804844A (en) * | 2017-11-28 | 2018-03-16 | 黄冈师范学院 | Oxides of nitrogen gas reclaims the method and device of diamond |
| CN209536986U (en) * | 2018-11-30 | 2019-10-25 | 黄冈师范学院 | A kind of diamond recyclable device not discharging nitrogen oxide |
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2018
- 2018-11-30 CN CN201811452213.2A patent/CN109264711B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645406A (en) * | 2014-12-04 | 2016-06-08 | 曾舟华 | Recovery method of diamond |
| CN107804844A (en) * | 2017-11-28 | 2018-03-16 | 黄冈师范学院 | Oxides of nitrogen gas reclaims the method and device of diamond |
| CN209536986U (en) * | 2018-11-30 | 2019-10-25 | 黄冈师范学院 | A kind of diamond recyclable device not discharging nitrogen oxide |
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