CN112522526A - Method for recovering germanium in wiping auxiliary material in germanium lens processing process - Google Patents
Method for recovering germanium in wiping auxiliary material in germanium lens processing process Download PDFInfo
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- CN112522526A CN112522526A CN202011333579.5A CN202011333579A CN112522526A CN 112522526 A CN112522526 A CN 112522526A CN 202011333579 A CN202011333579 A CN 202011333579A CN 112522526 A CN112522526 A CN 112522526A
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- germanium
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- auxiliary material
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- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 title claims abstract description 141
- 229910052732 germanium Inorganic materials 0.000 title claims abstract description 119
- 239000000463 material Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000002791 soaking Methods 0.000 claims abstract description 113
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000005422 blasting Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000012141 concentrate Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B41/00—Obtaining germanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process, and relates to the technical field of germanium recovery. The invention comprises the following steps: s1: deep soaking and settling, namely firstly putting the wiping auxiliary material which is heavily adsorbed germanium powder and cannot be used repeatedly by grinding and polishing solution into a soaking tank, and adding clear water for soaking to obtain germanium-containing soaking solution and drained wiping auxiliary material; s2: thermally concentrating the germanium-containing soak solution in the thermal concentration equipment to remove water, so as to obtain germanium mud with more than 50% of germanium; s3: and (4) drying the drained wiping auxiliary materials fished out in the step (S1) by a drying oven and burning by a high-temperature furnace respectively to obtain germanium mud containing more than 30% of germanium. According to the invention, the auxiliary wiping material is repeatedly soaked in the soaking tank, so that germanium powder attached to the auxiliary wiping material is thoroughly stripped, then the soaking solution is subjected to thermal concentration to remove moisture, and the auxiliary wiping material is dried in the drying oven and burned in the high-temperature furnace, so that the recovery of germanium in the auxiliary wiping material is realized.
Description
Technical Field
The invention belongs to the technical field of germanium recovery, and particularly relates to a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process.
Background
In the processing process of the germanium lens, the processing procedures such as edging, milling, polishing and the like need to be carried out, particularly, in the grinding and polishing procedure, the surface of the ground and polished part needs to be cleaned for many times, the auxiliary wiping materials such as cotton, dust-free cloth, dust-free paper and the like used in the cleaning process can be adsorbed with germanium powder generated by grinding and polishing, the germanium powder generated by grinding and polishing is very fine, and the germanium powder and the auxiliary wiping materials such as cotton and the like are deeply diffused by wetting of grinding and polishing liquid, so that certain difficulty is caused to recovery.
In the prior art, auxiliary materials for wiping are directly cleaned, return water of germanium is carried out in production water, or the auxiliary materials for wiping are directly mixed into germanium mud for extraction and recovery, the liquid quantity of the auxiliary materials is large, the recovery rate is low, and the auxiliary materials for wiping cause more solid phases of the germanium mud and consume more chemical reagents.
There is therefore a need for improvements in the prior art to address the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a method for recovering germanium from a wiping auxiliary material in a germanium lens processing process, which comprises the steps of putting a wiping auxiliary material which can not be repeatedly used by heavy adsorption germanium powder and grinding polishing solution into a soaking tank, adding clear water for repeated soaking to form soaking solution and a wiping auxiliary material containing a certain amount of germanium powder, removing water by thermal concentration of the soaking solution to obtain germanium mud containing more than 50% of germanium, drying the soaked wiping auxiliary material by a drying box, firing by a high-temperature furnace to obtain germanium mud containing more than 30% of germanium, mixing the two kinds of germanium mud to form germanium concentrate, recovering the germanium from the wiping auxiliary material, and solving the problems of lower recovery rate and more consumption of chemical reagents in the method for recovering the germanium from the wiping auxiliary material in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process, which comprises the following steps of:
s1: deep soaking and settling, namely firstly putting the heavily-adsorbed germanium powder and the grinding and polishing solution into a soaking tank for repeatedly using the auxiliary wiping material, adding clear water for soaking, wherein the clear water completely does not wipe the auxiliary wiping material, the soaking temperature is set to be 40-50 ℃, the soaking time is set to be 1-2 hours, 1-2 hours later, fishing out the auxiliary wiping material in the soaking tank, pumping the rest germanium-containing soaking solution into a thermal concentration device, then putting the fished auxiliary wiping material back into the soaking tank, adding clear water for soaking, wherein the clear water completely does not wipe the auxiliary wiping material, the soaking temperature is set to be 50-60 ℃, the soaking time is set to be 1-2 hours later, fishing out and draining the auxiliary wiping material in the soaking tank after 1-2 hours, pumping the rest germanium-containing soaking solution into the thermal concentration device, and mixing the rest germanium-containing soaking solution with the first soaking solution;
s2: removing water from the germanium-containing soak solution in the thermal concentration equipment through thermal concentration to obtain germanium mud with the germanium content of more than 50%;
s3: drying the drained wiping auxiliary materials fished out in the step S1 by a drying oven and firing by a high-temperature furnace respectively to obtain germanium mud containing more than 30% of germanium;
s4: and (3) uniformly mixing the germanium mud obtained in the step (S2) and the germanium mud obtained in the step (S3) to form germanium concentrate serving as a raw material for extracting germanium, so that the recovery of germanium in the wiping auxiliary material is realized.
Further, in S1, the auxiliary wiping material is cotton, dust-free cloth, dust-free paper, or other auxiliary material for wiping and cleaning the surface of the germanium lens.
Further, the soaking tank in the S1 is a square tank body, the length, width and height of the soaking tank are 500mm multiplied by 400mm multiplied by 300mm, the bottom of the tank body of the soaking tank is provided with a heating assembly, and the heating assembly can adopt an electric heating assembly or a microwave heating assembly.
Further, the cleaning aid is vibrated by ultrasonic waves during soaking in S1, and the surface of the cleaning aid is micro-blasted by using cavitation bubbles caused by the ultrasonic waves, so as to peel off the germanium powder attached to the cleaning aid.
Further, the drying box in the S3 is a screen type drying box, the auxiliary wiping materials are laid on the screen for drying during processing, and the laying and drying enable the drying to be more uniform, so that the drying efficiency is improved.
Further, the high-temperature furnace in the S3 is a high-temperature combustion tube furnace, and oxygen can be introduced for auxiliary combustion.
The invention has the following beneficial effects:
according to the invention, the auxiliary wiping material is repeatedly soaked in the soaking tank, then the soaking solution is subjected to thermal concentration to remove water, the auxiliary wiping material is dried in the drying box and burnt in the high-temperature furnace, so that the recovery of germanium in the auxiliary wiping material is realized, the subsequent treatment cost is reduced, the recovery rate of germanium is improved, and the problems of lower recovery rate and more consumption of chemical reagents in the method for treating the recovery of germanium in the auxiliary wiping material in the prior art are solved.
According to the invention, two-stage soaking is adopted in the soaking process, and the time and the temperature are controlled well in the soaking process, so that the germanium powder attached to the wiping auxiliary material can be soaked in clear water more thoroughly, and the soaking effect is better.
According to the invention, ultrasonic waves are adopted for oscillation when the auxiliary wiping material is soaked, the cavity bubbles caused by the ultrasonic waves are utilized for micro-blasting on the surface of the auxiliary wiping material, and germanium powder attached to the auxiliary wiping material can be completely stripped, so that the soaking effect can be greatly improved, and the soaking efficiency is improved.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process, which comprises the following steps of:
s1: deep soaking and settling, firstly, putting the wiping auxiliary material which is heavily adsorbed germanium powder and grinding polishing solution and can not be used repeatedly into a soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to be 40 ℃, the soaking time is set to be 2 hours, oscillating by using ultrasonic waves during soaking, carrying out micro-blasting on the surface of the wiping auxiliary material by using cavity bubbles caused by the ultrasonic waves, stripping the germanium powder attached to the wiping auxiliary material, fishing out the wiping auxiliary material in the soaking tank after 2 hours, pumping the rest germanium-containing soaking solution into a thermal concentration device, then putting the fished wiping auxiliary material back into the soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to be 50 ℃, the soaking time is set to be 2 hours, oscillating by using the ultrasonic waves during soaking, carrying out micro-blasting on the surface of the wiping auxiliary material by using the cavity bubbles caused by the ultrasonic waves, stripping off germanium powder attached to the auxiliary wiping material, after 2 hours, fishing out the auxiliary wiping material in the soaking tank, draining, pumping the rest germanium-containing soaking solution into a thermal concentration device to be mixed with the first soaking solution, wherein the auxiliary wiping material is auxiliary materials for wiping and cleaning the surface of the germanium lens, such as cotton, dust-free cloth, dust-free paper and the like, the soaking tank is a square tank body, the length and width of the soaking tank are 500mm multiplied by 400mm multiplied by 300mm, and the bottom of the tank body of the soaking tank is provided with a heating component;
s2: thermally concentrating the germanium-containing soak solution in the thermal concentration equipment to remove water, so as to obtain germanium mud with more than 50% of germanium;
s3: drying the drained wiping auxiliary material fished out in the step S1 by a drying box and firing the dried wiping auxiliary material by a high-temperature furnace to obtain germanium mud with the germanium content of more than 30%, wherein the drying box is a screen type drying box, the wiping auxiliary material is laid on a screen to be dried during treatment, and the high-temperature furnace is a high-temperature combustion tubular furnace and can be introduced with oxygen to assist combustion;
s4: and (3) uniformly mixing the germanium mud obtained in the step (S2) and the germanium mud obtained in the step (S3) to form germanium concentrate serving as a raw material for extracting germanium, so that the recovery of germanium in the wiping auxiliary material is realized.
Example 2
The invention relates to a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process, which comprises the following steps of:
s1: deep soaking and settling, firstly, putting the wiping auxiliary material which is heavily adsorbed germanium powder and grinding polishing solution and can not be used repeatedly into a soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to 45 ℃, the soaking time is set to 1.5h, vibrating by using ultrasonic waves during soaking, utilizing cavity bubbles caused by the ultrasonic waves to perform micro-blasting on the surface of the wiping auxiliary material, stripping the germanium powder attached to the wiping auxiliary material, fishing out the wiping auxiliary material in the soaking tank after 1.5h, pumping the residual germanium-containing soaking solution into a thermal concentration device, then putting the fished wiping auxiliary material back into the soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to 55 ℃, the soaking time is set to 1.5h, vibrating by using the ultrasonic waves during soaking, utilizing the cavity bubbles caused by the ultrasonic waves to perform micro-blasting on the surface of the wiping auxiliary material, stripping off germanium powder attached to the auxiliary wiping material, after 1.5 hours, fishing out the auxiliary wiping material in the soaking tank, draining, pumping the rest germanium-containing soaking solution into a thermal concentration device to be mixed with the first soaking solution, wherein the auxiliary wiping material is auxiliary materials for wiping and cleaning the surface of the germanium lens, such as cotton, dust-free cloth, dust-free paper and the like, the soaking tank is a square tank body, the length and width of the soaking tank are 500mm multiplied by 400mm multiplied by 300mm, and the bottom of the tank body of the soaking tank is provided with a heating component;
s2: thermally concentrating the germanium-containing soak solution in the thermal concentration equipment to remove water, so as to obtain germanium mud with more than 50% of germanium;
s3: drying the drained wiping auxiliary material fished out in the step S1 by a drying box and firing the dried wiping auxiliary material by a high-temperature furnace to obtain germanium mud with the germanium content of more than 30%, wherein the drying box is a screen type drying box, the wiping auxiliary material is laid on a screen to be dried during treatment, and the high-temperature furnace is a high-temperature combustion tubular furnace and can be introduced with oxygen to assist combustion;
s4: and (3) uniformly mixing the germanium mud obtained in the step (S2) and the germanium mud obtained in the step (S3) to form germanium concentrate serving as a raw material for extracting germanium, so that the recovery of germanium in the wiping auxiliary material is realized.
Example 3
The invention relates to a method for recovering germanium in a wiping auxiliary material in a germanium lens processing process, which comprises the following steps of:
s1: deep soaking and settling, firstly, putting the wiping auxiliary material which is heavily adsorbed germanium powder and grinding polishing solution and can not be used repeatedly into a soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to be 50 ℃, the soaking time is set to be 1h, oscillating by using ultrasonic waves during soaking, carrying out micro-blasting on the surface of the wiping auxiliary material by using cavity bubbles caused by the ultrasonic waves, stripping the germanium powder attached to the wiping auxiliary material, fishing out the wiping auxiliary material in the soaking tank after 1h, pumping the rest germanium-containing soaking solution into a thermal concentration device, then putting the fished wiping auxiliary material back into the soaking tank, adding clear water for soaking, wherein the clear water can not completely wipe the auxiliary material, the soaking temperature is set to be 60 ℃, the soaking time is set to be 1h, oscillating by using the ultrasonic waves during soaking, carrying out micro-blasting on the surface of the wiping auxiliary material by using the cavity bubbles caused by the ultrasonic waves, stripping off germanium powder attached to the auxiliary wiping material, after 1 hour, fishing out the auxiliary wiping material in the soaking tank, draining, pumping the rest germanium-containing soaking solution into a thermal concentration device to be mixed with the first soaking solution, wherein the auxiliary wiping material is auxiliary materials for wiping and cleaning the surface of the germanium lens, such as cotton, dust-free cloth, dust-free paper and the like, the soaking tank is a square tank body, the length and width of the soaking tank are 500mm multiplied by 400mm multiplied by 300mm, and the bottom of the tank body of the soaking tank is provided with a heating component;
s2: thermally concentrating the germanium-containing soak solution in the thermal concentration equipment to remove water, so as to obtain germanium mud with more than 50% of germanium;
s3: drying the drained wiping auxiliary material fished out in the step S1 by a drying box and firing the dried wiping auxiliary material by a high-temperature furnace to obtain germanium mud with the germanium content of more than 30%, wherein the drying box is a screen type drying box, the wiping auxiliary material is laid on a screen to be dried during treatment, and the high-temperature furnace is a high-temperature combustion tubular furnace and can be introduced with oxygen to assist combustion;
s4: and (3) uniformly mixing the germanium mud obtained in the step (S2) and the germanium mud obtained in the step (S3) to form germanium concentrate serving as a raw material for extracting germanium, so that the recovery of germanium in the wiping auxiliary material is realized.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A method for recovering germanium in a wiping auxiliary material in a germanium lens processing process is characterized by comprising the following steps: the method comprises the following steps:
s1: deep soaking and settling, namely firstly putting the heavily-adsorbed germanium powder and the grinding and polishing solution into a soaking tank for repeatedly using the auxiliary wiping material, adding clear water for soaking, wherein the clear water completely does not wipe the auxiliary wiping material, the soaking temperature is set to be 40-50 ℃, the soaking time is set to be 1-2 hours, 1-2 hours later, fishing out the auxiliary wiping material in the soaking tank, pumping the rest germanium-containing soaking solution into a thermal concentration device, then putting the fished auxiliary wiping material back into the soaking tank, adding clear water for soaking, wherein the clear water completely does not wipe the auxiliary wiping material, the soaking temperature is set to be 50-60 ℃, the soaking time is set to be 1-2 hours later, fishing out and draining the auxiliary wiping material in the soaking tank after 1-2 hours, pumping the rest germanium-containing soaking solution into the thermal concentration device, and mixing the rest germanium-containing soaking solution with the first soaking solution;
s2: removing water from the germanium-containing soak solution in the thermal concentration equipment through thermal concentration to obtain germanium mud with the germanium content of more than 50%;
s3: drying the drained wiping auxiliary materials fished out in the step S1 by a drying oven and firing by a high-temperature furnace respectively to obtain germanium mud containing more than 30% of germanium;
s4: and (3) uniformly mixing the germanium mud obtained in the step (S2) and the germanium mud obtained in the step (S3) to form germanium concentrate serving as a raw material for extracting germanium, so that the recovery of germanium in the wiping auxiliary material is realized.
2. The method for recovering germanium from a wiping auxiliary material in a germanium lens processing procedure as claimed in claim 1, wherein the wiping auxiliary material in S1 is cotton, dust-free cloth, dust-free paper or other auxiliary material for wiping and cleaning the surface of the germanium lens.
3. The method for recovering germanium from the wiping auxiliary material in the germanium lens processing process as claimed in claim 1, wherein the soaking tank in the S1 is a square tank body, the length, width and height of the soaking tank are 500mm x 400mm x 300mm, and a heating element is arranged at the bottom of the tank body of the soaking tank.
4. The method for recovering germanium from a wiping auxiliary material in a germanium lens processing process as claimed in claim 1, wherein the wiping auxiliary material is subjected to ultrasonic vibration during soaking in S1, and the surface of the wiping auxiliary material is subjected to micro-blasting by using cavity bubbles caused by ultrasonic waves to strip germanium powder attached to the wiping auxiliary material.
5. The method for recovering germanium from a wiping assistant material in the germanium lens processing process as claimed in claim 1, wherein the drying oven in S3 is a screen type drying oven, and the wiping assistant material is laid on the screen for drying.
6. The method of claim 1, wherein the high temperature furnace in S3 is a high temperature combustion tube furnace, and oxygen can be introduced to assist combustion.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117358926A (en) * | 2023-12-05 | 2024-01-09 | 天津大学 | Preparation method of germanium diaphragm array and light field imaging system |
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| CN111304588A (en) * | 2020-03-26 | 2020-06-19 | 中国建筑材料科学研究总院有限公司 | Infrared germanium carbide film, infrared material with germanium carbide film, and preparation method and application of infrared material |
| CN111647760A (en) * | 2020-06-16 | 2020-09-11 | 中南大学 | Method for selectively recovering germanium, bismuth and silicon from bismuth-doped silica optical fiber |
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