CN112299471B - Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste - Google Patents
Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste Download PDFInfo
- Publication number
- CN112299471B CN112299471B CN202011338980.8A CN202011338980A CN112299471B CN 112299471 B CN112299471 B CN 112299471B CN 202011338980 A CN202011338980 A CN 202011338980A CN 112299471 B CN112299471 B CN 112299471B
- Authority
- CN
- China
- Prior art keywords
- zinc
- roasting
- electronic waste
- containing electronic
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
- C01G9/03—Processes of production using dry methods, e.g. vapour phase processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses a method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste, which comprises the steps of uniformly mixing the zinc-containing electronic waste with a carbonaceous reducing agent and a stabilizer consisting of calcium oxide and inert aluminum oxide, roasting at 800-950 ℃ in an inert atmosphere, sequentially introducing roasting volatile substances into a weak oxidizing atmosphere for oxidizing roasting at 700-950 ℃ and a strong oxidizing atmosphere for oxidizing roasting at 500-700 ℃ to obtain nano zinc oxide powder; the method takes zinc-containing electronic waste as a raw material to efficiently recover zinc and prepare the high-purity nano zinc oxide powder material, not only realizes waste utilization, but also obtains higher economic value, and the method has the advantages of simple operation, low production cost and environmental protection, and meets the requirements of industrial production.
Description
Technical Field
The invention relates to a method for recovering zinc from zinc-containing electronic waste, in particular to a method for efficiently separating zinc from the zinc-containing electronic waste to obtain high-purity nano zinc oxide, belonging to the technical field of electronic waste recovery.
Background
Since the 21 st century, along with the exhaustion of ore resources, the extraction and metallurgy process is gradually changed from the traditional ore resources to the extraction and regeneration from secondary resources through a long flow of mining, selecting and smelting; with the coming of the information era, the use and elimination rate of electronic products is continuously improved, and an urban mine mainly using electronic wastes becomes a key point for extracting metallurgical attention in the future.
Unlike natural ore, most of the metal elements in the electronic waste exist in the form of simple metal and alloy, so the extraction metallurgical process cannot be completely similar to the traditional metallurgical process. Meanwhile, the electronic waste has various types and high content of metal elements, and if the electronic waste is completely put into the traditional pyrometallurgical and hydrometallurgical process, the loss rate of the metal elements is high, and particularly, in the pyrometallurgical process, precious metals such as gold and silver are easily dispersed in slag and are difficult to further enrich, separate and recover.
In electronic waste, metallic zinc is a base metal and has a low value relative to copper, tin, gold, silver equivalents. The existing zinc separation and recovery processes mainly comprise a wet method and a fire method. The pyrogenic process is characterized in that electronic waste is directly put into a fuming furnace to be smelted and copper is extracted, a large amount of zinc enters smoke dust, and the zinc-containing smoke dust is collected and then purified through reduction distillation, refining distillation and other processes to obtain a zinc product. The hydrometallurgy process is relatively simple, the electronic waste product is directly leached by an oxidant and an acidic solvent, a plurality of metal elements are simultaneously dissolved into a solution, and then selective separation and recovery are carried out according to the precipitation property difference of different metal elements. Because the metal zinc is a heavy metal element, the metal zinc has extremely high harmfulness to the environment, particularly human bodies, and the existing recovery process inevitably generates various waste acids, waste liquids, waste gases, waste residues and the like. In addition, the product obtained by the existing disposal process is still a metal zinc ingot, and the comprehensive value is low. Therefore, a new process flow which is simple to operate and good in separation effect and can improve the economic added value of the prepared product is required to be developed, and the high-efficiency extraction and high-valued processing and utilization of zinc in the electronic waste are realized.
Disclosure of Invention
Aiming at the problems of low comprehensive recovery rate and low economic added value of zinc in zinc-containing electronic waste in the prior art, the invention aims to provide a method for efficiently separating zinc from the zinc-containing electronic waste in a high-temperature volatilization mode and recovering the zinc in a high-purity nano zinc oxide form.
In order to achieve the technical purpose, the invention provides a method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste, which comprises the steps of uniformly mixing the zinc-containing electronic waste with a carbonaceous reducing agent and a stabilizing agent, placing the mixture in an inert atmosphere to roast at the temperature of 800-950 ℃, sequentially placing roasted volatile matters into a weak oxidizing atmosphere to carry out oxidizing roasting at the temperature of 700-950 ℃ and a strong oxidizing atmosphere to carry out oxidizing roasting at the temperature of 500-700 ℃ to obtain nano zinc oxide powder; the stabilizer is a mixture of calcium oxide and inert alumina.
The key point of the method for synchronously preparing the nano zinc oxide by efficiently separating the zinc from the zinc-containing electronic waste is to efficiently volatilize and gradually oxidize the zinc in the zinc-containing electronic waste by cooperatively controlling the atmosphere and the temperature to obtain the high-purity nano zinc oxide powder. Zinc-containing electronic waste enters a first-stage roasting region, roasting is carried out under the control of higher temperature, and under the promotion action of weak reducing atmosphere and stabilizing agent provided by a carbonaceous reducing agent, zinc is efficiently volatilized as far as possible, a volatilized zinc intermediate product enters a second-stage roasting region along with air flow, and oxidation is carried out by properly adjusting to slightly lower temperature and weak oxidizing atmosphere, so that zinc can be quickly oxidized into nano zinc oxide nano crystal nuclei, the nano zinc oxide nano crystal nuclei enter a third-stage roasting region, the temperature is further reduced by adjusting the third-stage roasting region, and strong oxidizing atmosphere, so that the oxidation rate of zinc can be further improved under the condition, the growth of the nano zinc oxide nano crystal nuclei is controlled, and nano particles with uniform crystal sizes are obtained. And is separated out from the gas phase, so that a high-purity nano zinc oxide powder product can be collected and obtained in the three-stage roasting area.
Because the melting point of the metal zinc is lower than that of other metals, gas-phase zinc vapor is easily formed under inert and reducing atmosphere, but the zinc vapor is easy to be coagulated and agglomerated in the condensation and nucleation processes, crystal grains grow to micrometer or even millimeter grade, the dispersibility is extremely poor, and the subsequent oxidation and processing utilization are not facilitated. According to the technical scheme, the multi-stage oxidation atmosphere is combined with the gradient temperature distribution, so that high-temperature volatilization, stage oxidation conversion and homogeneous nucleation of the metal zinc element can be realized, and the nano zinc oxide powder with full oxidation and perfect crystallization can be obtained.
The carbonaceous reducing agent can play a role in surface activation by generating a small amount of gases such as CO and the like, inhibit the surface oxidation of substances to form an oxide film, and the stabilizer is a substance with low reaction activity, improves the melting point of a mixed material, increases the contact area of the material and the gases, thereby strengthening the volatilization reaction. The inert alumina of the invention particularly refers to corundum crystal form alumina, which has compact structure and low reaction activity after being roasted at high temperature and is not easy to react with other metals and oxides.
As a preferable scheme, the zinc-containing electronic waste is pretreated by a vacuum pyrolysis method or a mechanical crushing separation method, the zinc content is higher than 3.0% by mass, and the organic matter content is lower than 1.0% by mass. The zinc-containing electronic waste is pretreated by a vacuum pyrolysis method or a mechanical crushing separation method, so that the organic content of the zinc-containing electronic waste can be reduced, toxic organic gas generated in the roasting process is reduced, and the influence on the zinc volatilization process is reduced.
Preferably, the carbonaceous reducing agent is coke powder, and the mass of the carbonaceous reducing agent accounts for 1.0-3.0% of the total mass of the zinc-containing electronic waste, the carbonaceous reducing agent and the stabilizer. The coke powder is preferably adopted, mainly, the coke powder has relatively poor reactivity, can not be rapidly gasified under a high-temperature condition so as to maintain a local anoxic condition, and simultaneously generates a small amount of gases such as CO and the like, so that the surface activation effect is realized, and the formation of oxides is inhibited.
Preferably, the mass of the stabilizer accounts for 5.0-10.0% of the total mass of the zinc-containing electronic waste, the carbonaceous reducing agent and the stabilizer. Because the melting points of a large amount of metal simple substances and alloys in the electronic waste are low, the melting point of the mixed material can be improved by adopting the stabilizer, and the specific surface is improved, so that the volatilization reaction of zinc is promoted to be stably carried out.
As a preferable scheme, the stabilizing agent is formed by inert calcium oxide and inert alumina according to the mass ratio of CaO/Al2O31.5 to 2.5.
As a preferable scheme, in the roasting process under the inert atmosphere, the inert atmosphere is controlled to be 100% nitrogen, the gas flow rate is 0.1-0.3 m/s, and the roasting time is 60-120 min.
As a preferable scheme, in the process of carrying out the oxidizing roasting in the weak oxidizing atmosphere, the weak oxidizing atmosphere is controlled to be O2/(O2+N2) The volume ratio is 5-10%, and the gas flow rate is 0.1-0.3 m/s. Under the preferable reaction condition, the volatilized zinc can be quickly oxidized into zinc oxide crystal nucleus.
As a preferable scheme, in the process of carrying out oxidizing roasting in a strong oxidizing atmosphere, the strong oxidizing atmosphere is controlled to be O2/(O2+N2) The volume ratio is 50-70%, and the gas flow rate is 0.2-0.5 m/s. Under the optimized condition, the deep oxidation of zinc can be ensured, and the growth of nano zinc oxide nano crystal nucleus is controlled, so that nano particles with uniform crystal size are obtained.
According to the invention, zinc-containing electronic waste is pretreated to remove organic components, and then is mainly mixed with metal powder, main metal elements comprise zinc, tin, copper, lead, gold, indium, silver and the like, various metal elements mostly exist in the form of simple substances or metal alloys, the boiling point of zinc in a series of simple substances is lowest, the zinc is easy to gasify to form steam, but the gasification reaction is influenced by partial product partial pressure, when the partial pressure is too high, the forward proceeding rate of the gasification reaction is slow, the volatilization rate of metal zinc is low, and the zinc steam is continuously separated to enter an oxidizing roasting area through airflow regulation and control, so that the partial pressure of the zinc steam can be obviously reduced, the reaction temperature is reduced, and the reaction efficiency is improved. The zinc vapor can rapidly oxidize the zinc oxide in the presence of oxygen, the conversion process can be controlled by the synergistic effect of temperature and atmosphere, so that the uniform nucleation and growth of the zinc oxide are realized, finally, the dispersibility is ensured by means of the similarity of the electrical property of the surfaces of the zinc oxide in the multistage conversion process and mutual repulsion, and finally, the nanoscale zinc oxide product with uniform granularity and stable components is obtained.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1) the method takes the zinc-containing electronic waste as the raw material, realizes the comprehensive utilization and harmless disposal of the solid waste, and simultaneously obtains products with high added value.
2) The invention can efficiently separate and recover zinc in the electronic waste by synergistically controlling the temperature and atmosphere for multi-stage roasting conversion, and the recovery rate can reach more than 90%.
3) The zinc oxide product prepared by the method reaches the nanometer level and the specific surface area is 100m2More than g, and even particle size distribution, and can be applied to a plurality of fields such as catalysis, batteries, optical materials and the like.
Drawings
Figure 1 XRD and microstructure analysis of the product prepared in example 1.
Detailed Description
The following examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
Comparative example 1
The method comprises the following steps of (1) putting zinc-containing electronic waste pyrolysis slag as a raw material (the content of metal zinc is 5.2%, the content of organic matters is 0.5%) into a three-stage type controlled atmosphere roasting furnace for controlled atmosphere roasting; the material is placed in a first section of bakingIn the burning area, the first-stage atmosphere is 100% nitrogen atmosphere, the burning temperature is 950 ℃, the gas flow rate is 0.2m/s, and the burning time is 60 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 5 percent, the roasting temperature is 950 ℃, and the gas flow rate is 0.3 m/s; the strong oxidizing atmosphere of three-stage roasting is O2/(O2+N2) 50 percent, the roasting temperature is 700 ℃, and the gas flow rate is 0.5 m/s; the product can be separated and collected in three sections, the recovery rate of zinc is 30.2 percent, and the purity of the nano zinc oxide product is 75.5 percent. This comparative example illustrates that zinc volatilization is affected resulting in low recovery without the addition of carbonaceous reducing agents and stabilizers and that the collected product will be mixed with other oxides.
Comparative example 2
The method comprises the steps of taking zinc-containing electronic waste pyrolysis residues as raw materials (the content of metal zinc is 5.2%, the content of organic matters is 0.5%), adding coke powder according to the mass ratio of 1.0%, adding a stabilizer (the stabilizer is a mixture of inert calcium oxide and aluminum oxide, and the proportion of the stabilizer is CaO/Al2O31.5), mixing the mixed materials fully, and placing the mixture in a two-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting region with 100% nitrogen atmosphere at a roasting temperature of 950 deg.C and a gas flow rate of 0.2m/s for 60 min; the volatile intermediate product enters a second stage with airflow in sequence, and the second stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) The roasting temperature is 950 ℃, the gas flow rate is 0.3m/s, the product can be separated and collected in the two-stage region, the zinc recovery rate is 85 percent, and the purity of the nano zinc oxide product is 60.5 percent. The comparative example shows that after the carbonaceous reducing agent and the stabilizing agent are added, zinc is volatilized efficiently, and the conversion rate is obviously improved; the weak oxidation in the second stage does not completely oxidize the zinc and the collected product is mixed with a large amount of intermediate products that are completely oxidized.
Example 1
The zinc-containing electronic waste pyrolysis residue is used as a raw material (the content of metal zinc is 5.2 percent, the content of organic matters is 0.5 percent), coke powder is added according to the mass ratio of 1.0 percent, and 10.0 percent of coke powder is added according to the mass ratioStabilizer (the stabilizer is a mixture of inert calcium oxide and alumina with the proportion of CaO/Al2O31.5), uniformly mixing the mixed materials, and placing the mixed materials in a three-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting region with 100% nitrogen atmosphere at a roasting temperature of 950 deg.C and a gas flow rate of 0.2m/s for 60 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 5 percent, the roasting temperature is 950 ℃, and the gas flow rate is 0.3 m/s; the three-stage roasting weak oxidizing atmosphere is O2/(O2+N2) 50 percent, the roasting temperature is 700 ℃, and the gas flow rate is 0.5 m/s; the high-purity nano zinc oxide powder product can be obtained by separation and collection in three sections, the zinc recovery rate is 92.5 percent, the nano zinc oxide product purity is 98.5 percent, and the specific surface area of the zinc oxide is 126m2(ii) in terms of/g. (XRD phase analysis and microstructure analysis of the synthesized product are shown in FIG. 1, the grain size is 65nm, the theoretical purity is 98.5%, and the product dispersibility is good)
Example 2
The method comprises the steps of taking zinc-containing electronic waste pyrolysis residues as raw materials (the content of metal zinc is 5.2%, the content of organic matters is 0.5%), adding coke powder according to the mass ratio of 3.0%, adding a stabilizer (the stabilizer is a mixture of inert calcium oxide and aluminum oxide, and the proportion of the stabilizer is CaO/Al2O32.0), mixing the mixed materials fully, and placing the mixture in a three-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting region, wherein the first-stage atmosphere is 100% nitrogen atmosphere, the roasting temperature is 800 ℃, the gas flow rate is 0.1m/s, and the roasting time is 120 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 10 percent, the roasting temperature is 700 ℃, and the gas flow rate is 0.1 m/s; the three-stage roasting weak oxidizing atmosphere is O2/(O2+N2) 70 percent of the total weight of the raw materials, the roasting temperature is 500 ℃, and the gas flow rate is 0.5 m/s; the high-purity nano zinc oxide powder product can be obtained by separation and collection in three sections, the zinc recovery rate is 91.2 percent, and the nano zinc oxide productPurity 99.0%, zinc oxide specific surface area 156m2/g。
Example 3
The method comprises the steps of taking zinc-containing electronic waste pyrolysis residues as raw materials (the content of metal zinc is 5.2%, the content of organic matters is 0.5%), adding coke powder according to the mass ratio of 2.0%, adding a stabilizer (the stabilizer is a mixture of inert calcium oxide and aluminum oxide, and the proportion of the stabilizer is CaO/Al2O32.5), mixing the mixed materials fully, and placing the mixture in a three-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting region, wherein the first-stage atmosphere is 100% nitrogen atmosphere, the roasting temperature is 875 ℃, the gas flow rate is 0.2m/s, and the roasting time is 60 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 5 percent, the roasting temperature is 850 ℃, and the gas flow rate is 0.2 m/s; the three-stage roasting weak oxidizing atmosphere is O2/(O2+N2) 60 percent, the roasting temperature is 600 ℃, and the gas flow rate is 0.3 m/s; the high-purity nano zinc oxide powder product can be obtained by separation and collection in three sections, the zinc recovery rate is 93.2 percent, the nano zinc oxide product purity is 97.9 percent, and the specific surface area of the zinc oxide is 144m2/g。
Example 4
The method comprises the steps of taking a metal mixture obtained by a zinc-containing electronic waste mechanical crushing separation method as a raw material (the content of metal zinc is 4.3 percent, the content of organic matters is 0.9 percent), adding coke powder according to the mass ratio of 1.5 percent, adding a stabilizer (the stabilizer is a mixture of inert calcium oxide and aluminum oxide, and the proportion of the stabilizer is CaO/Al2O32.2), mixing the mixed materials fully, and placing the mixture in a three-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting area, wherein the first-stage atmosphere is 100% nitrogen atmosphere, the roasting temperature is 925 ℃, the gas flow rate is 0.1m/s, and the roasting time is 90 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 7.5 percent, the roasting temperature is 900 ℃, and the gas flow rate is 0.2 m/s; the three-stage roasting weak oxidizing atmosphere is O2/(O2+N2) 50 percent, the roasting temperature is 700 ℃, and the gas flow rate is 0.4 m/s; the high-purity nano zinc oxide powder product can be obtained by separation and collection in three sections, the zinc recovery rate is 94.2 percent, the nano zinc oxide product purity is 98.7 percent, and the specific surface area of the zinc oxide is 134m2/g。
Example 5
The method comprises mechanically crushing zinc-containing electronic waste to obtain metal mixture as raw material (zinc content 4.3%, organic matter content 0.9%), adding coke powder 3.0% by mass, and stabilizer 5.5% by mass (the stabilizer is mixture of inert calcium oxide and aluminum oxide, and the ratio is CaO/Al2O31.9), mixing the mixed materials fully, and placing the mixture in a three-section type controlled atmosphere roasting furnace for controlled atmosphere roasting; placing the material in a first-stage roasting region, wherein the first-stage atmosphere is 100% nitrogen atmosphere, the roasting temperature is 950 ℃, the gas flow rate is 0.1m/s, and the roasting time is 120 min; the volatile intermediate product enters a second-stage roasting zone and a third-stage roasting zone along with airflow, and the second-stage atmosphere is a weak oxidizing atmosphere O2/(O2+N2) 5 percent, the roasting temperature is 800 ℃, and the gas flow rate is 0.2 m/s; the three-stage roasting weak oxidizing atmosphere is O2/(O2+N2) 55 percent, the roasting temperature is 800 ℃, and the gas flow rate is 0.3 m/s; the high-purity nano zinc oxide powder product can be obtained by separation and collection in three sections, the zinc recovery rate is 91.8 percent, the nano zinc oxide product purity is 98.1 percent, and the specific surface area of the zinc oxide is 124m2/g。
Claims (3)
1. A method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste is characterized by comprising the following steps: uniformly mixing zinc-containing electronic waste with a carbonaceous reducing agent and a stabilizer, roasting at 800-950 ℃ in an inert atmosphere, sequentially putting roasted volatile matters into a weak oxidizing atmosphere to be subjected to oxidizing roasting at 700-950 ℃ and a strong oxidizing atmosphere to be subjected to oxidizing roasting at 500-700 ℃ to obtain nano zinc oxide powder; the stabilizer is a mixture of calcium oxide and inert alumina; the stabilizer is prepared from calcium oxide and inert alumina according to the mass ratio of CaO/Al2O31.5-2.5; in the inert stateIn the roasting process under the atmosphere, the inert atmosphere is controlled to be 100% nitrogen, the gas flow rate is 0.1-0.3 m/s, and the roasting time is 60-120 min; during the process of oxidizing roasting in the weak oxidizing atmosphere, the weak oxidizing atmosphere is controlled to be O2/(O2+N2) The volume ratio is 5-10%, and the gas flow rate is 0.1-0.3 m/s; in the process of oxidizing roasting in a strong oxidizing atmosphere, the strong oxidizing atmosphere is controlled to be O2/(O2+N2) The volume ratio is 50-70%, and the gas flow rate is 0.2-0.5 m/s; the mass of the stabilizer accounts for 5.0-10.0% of the total mass of the zinc-containing electronic waste, the carbonaceous reducing agent and the stabilizer.
2. The method for synchronously preparing the nano zinc oxide by efficiently separating the zinc from the zinc-containing electronic waste according to claim 1, which is characterized by comprising the following steps of: the zinc-containing electronic waste is pretreated by a vacuum pyrolysis method or a mechanical crushing separation method, the mass percent of zinc is higher than 3.0%, and the mass percent of organic matters is lower than 1.0%.
3. The method for synchronously preparing the nano zinc oxide by efficiently separating the zinc from the zinc-containing electronic waste according to claim 1, which is characterized by comprising the following steps of: the carbonaceous reducing agent is coke powder, and the mass of the carbonaceous reducing agent accounts for 1.0-3.0% of the total mass of the zinc-containing electronic waste, the carbonaceous reducing agent and the stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338980.8A CN112299471B (en) | 2020-11-25 | 2020-11-25 | Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011338980.8A CN112299471B (en) | 2020-11-25 | 2020-11-25 | Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112299471A CN112299471A (en) | 2021-02-02 |
| CN112299471B true CN112299471B (en) | 2022-02-15 |
Family
ID=74336047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011338980.8A Active CN112299471B (en) | 2020-11-25 | 2020-11-25 | Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112299471B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150380B (en) * | 2021-10-29 | 2023-06-13 | 中广核研究院有限公司 | Zinc oxide crystal and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB453318A (en) * | 1935-01-30 | 1936-09-09 | Pirelli | Improvements in or relating to the manufacture of zinc oxide |
| GB681460A (en) * | 1950-01-12 | 1952-10-22 | New Jersey Zinc Co | Improvements in smelting of zinciferous ore |
| JPH05132723A (en) * | 1991-11-12 | 1993-05-28 | Himeji Tekko Rifuain Kk | Method for recovering zinc and lead from steelmaking dust |
| CN1858001A (en) * | 2005-04-29 | 2006-11-08 | 南京大学 | Method for preparing different shape zinc oxide by vacuum limit oxygen method |
| CN101003910A (en) * | 2006-12-15 | 2007-07-25 | 付敏恭 | Zn0 crystallite material, and preparation method |
| CN103145176A (en) * | 2013-02-04 | 2013-06-12 | 唐山海港合缘锌业有限公司 | High-activity empty frame zinc oxide production method by means of industrial zinciferous smoke dust |
| CN103388081A (en) * | 2013-07-23 | 2013-11-13 | 中南大学 | Bath smelting method and apparatus of zinc sulfide concentrate and lead-zinc containing materials |
| CN105271435A (en) * | 2015-10-06 | 2016-01-27 | 聊城大学 | Production technology for preparing polyferric chloride coagulant from seamless steel pipe acid-washing waste liquid |
| CN106006716A (en) * | 2016-07-01 | 2016-10-12 | 赫章县金川锌业有限公司 | Method for producing direct-method zinc oxide by utilizing belt type roasting machine |
| CN108505120A (en) * | 2018-04-04 | 2018-09-07 | 慈溪市嘉和新材料科技有限公司 | The production technology that zinc oxide composite crystal must be synthesized disposably |
| CN109650379A (en) * | 2019-02-19 | 2019-04-19 | 厦门大学 | A kind of single-walled carbon nanotube graded oxidation purification process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10212680A1 (en) * | 2002-03-22 | 2003-10-09 | Degussa | Nanoscale zinc oxide, process for its production and use |
| CN100392158C (en) * | 2005-01-31 | 2008-06-04 | 中南大学 | Method for preparing nano four-needle-shape zinc oxide crystal whisker |
| CN101941732A (en) * | 2010-10-11 | 2011-01-12 | 上海交通大学 | Mass production method of zinc oxide nanowires |
| CN102432060A (en) * | 2011-09-28 | 2012-05-02 | 上海交通大学 | Method for quickly preparing zinc oxide nanobelt under air atmosphere |
-
2020
- 2020-11-25 CN CN202011338980.8A patent/CN112299471B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB453318A (en) * | 1935-01-30 | 1936-09-09 | Pirelli | Improvements in or relating to the manufacture of zinc oxide |
| GB681460A (en) * | 1950-01-12 | 1952-10-22 | New Jersey Zinc Co | Improvements in smelting of zinciferous ore |
| JPH05132723A (en) * | 1991-11-12 | 1993-05-28 | Himeji Tekko Rifuain Kk | Method for recovering zinc and lead from steelmaking dust |
| CN1858001A (en) * | 2005-04-29 | 2006-11-08 | 南京大学 | Method for preparing different shape zinc oxide by vacuum limit oxygen method |
| CN101003910A (en) * | 2006-12-15 | 2007-07-25 | 付敏恭 | Zn0 crystallite material, and preparation method |
| CN103145176A (en) * | 2013-02-04 | 2013-06-12 | 唐山海港合缘锌业有限公司 | High-activity empty frame zinc oxide production method by means of industrial zinciferous smoke dust |
| CN103388081A (en) * | 2013-07-23 | 2013-11-13 | 中南大学 | Bath smelting method and apparatus of zinc sulfide concentrate and lead-zinc containing materials |
| CN105271435A (en) * | 2015-10-06 | 2016-01-27 | 聊城大学 | Production technology for preparing polyferric chloride coagulant from seamless steel pipe acid-washing waste liquid |
| CN106006716A (en) * | 2016-07-01 | 2016-10-12 | 赫章县金川锌业有限公司 | Method for producing direct-method zinc oxide by utilizing belt type roasting machine |
| CN108505120A (en) * | 2018-04-04 | 2018-09-07 | 慈溪市嘉和新材料科技有限公司 | The production technology that zinc oxide composite crystal must be synthesized disposably |
| CN109650379A (en) * | 2019-02-19 | 2019-04-19 | 厦门大学 | A kind of single-walled carbon nanotube graded oxidation purification process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112299471A (en) | 2021-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | A review of current progress of recycling technologies for metals from waste electrical and electronic equipment | |
| CN106756113B (en) | A kind of method that arsenic sulfide slag reduction sulphur fixing roast directly produces metallic arsenic | |
| CN101078052B (en) | Method for synthetically reclaiming iron and non-ferrous metal from solid waste of iron and steel plant | |
| CN108359814B (en) | Antimony sulfide gold ore oxygen-enriched molten pool smelting method | |
| CN110042255B (en) | Method for recovering valuable metals in copper smelting soot through multistage controlled atmosphere roasting separation | |
| CN102643996A (en) | Method for producing lead bullion by means of copper dross side-blown smelting | |
| CN111647738B (en) | Method for reduction dearsenification of arsenic-containing copper slag roasting gas base | |
| CN111235397A (en) | Process for efficiently treating copper smelting smoke dust | |
| CN112299471B (en) | Method for synchronously preparing nano zinc oxide by efficiently separating zinc from zinc-containing electronic waste | |
| Ma et al. | Thermodynamic analysis and experimental verification of the green and efficient recycling of waste sulfur slag by airtight sulfuration-vacuum distillation | |
| CN111733336B (en) | Preparation process and system for producing high-grade titanium-rich material by utilizing ilmenite | |
| CN112941303A (en) | Method for recycling valuable metal from non-ferrous metal smelting slag | |
| CN115821064B (en) | Low-temperature reduction method for antimony oxide | |
| CN101481806A (en) | Method for desulphurization of copper sulfur ore | |
| CN112279297B (en) | Method for selectively separating tin from electronic waste and synchronously preparing nano tin dioxide | |
| CN112391533B (en) | Method for preparing nano stannous sulfide from stanniferous electronic waste by one-step method | |
| WO2022140805A1 (en) | Process for the production of zinc as zinc oxide or zinc metal directly from sulfide ores. | |
| CN109576431B (en) | One-step comprehensive recovery method for flash roasting of neodymium iron boron waste | |
| CN110863218B (en) | Method for extracting gold by adopting molten salt electrolysis enrichment | |
| CN115011804A (en) | Method for removing arsenic by co-roasting high-arsenic antimony-lead anode mud air and water vapor | |
| CN115354155B (en) | System and method for microwave dearsenification of arsenic-containing material | |
| CN111254287A (en) | Smelting recovery method of lead-zinc-containing enriched oxide | |
| CN112575194B (en) | Additive for strengthening tin oxidation volatilization in waste soldering tin and application thereof | |
| CN112080648B (en) | Method for treating indium-containing high-iron zinc sulfide concentrate | |
| CN108048672B (en) | Extraction furnace and extraction method for extracting germanium in low-grade germanium concentrate by thermal reduction and volatilization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |