CN101376928B - Process for smelting magnesium by microwave heating Pidgeon process - Google Patents
Process for smelting magnesium by microwave heating Pidgeon process Download PDFInfo
- Publication number
- CN101376928B CN101376928B CN2008102328551A CN200810232855A CN101376928B CN 101376928 B CN101376928 B CN 101376928B CN 2008102328551 A CN2008102328551 A CN 2008102328551A CN 200810232855 A CN200810232855 A CN 200810232855A CN 101376928 B CN101376928 B CN 101376928B
- Authority
- CN
- China
- Prior art keywords
- magnesium
- heating
- reduction jar
- pelletizing
- microwave
- 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.)
- Expired - Fee Related
Links
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 45
- 239000011777 magnesium Substances 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003723 Smelting Methods 0.000 title claims description 11
- 239000000843 powder Substances 0.000 claims abstract description 14
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 12
- 239000010459 dolomite Substances 0.000 claims abstract description 8
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000010436 fluorite Substances 0.000 claims abstract description 6
- 238000001354 calcination Methods 0.000 claims abstract description 4
- 150000002681 magnesium compounds Chemical class 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 238000005453 pelletization Methods 0.000 claims description 15
- 238000005516 engineering process Methods 0.000 claims description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910052581 Si3N4 Inorganic materials 0.000 abstract 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 abstract 2
- 239000002253 acid Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000011946 reduction process Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 23
- 230000005684 electric field Effects 0.000 description 6
- 238000007670 refining Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 235000011089 carbon dioxide Nutrition 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses a magnesium reduction process through a micro-wave heating silicothermic method; the process comprises the following steps: 1. dolomite calcinations: the dolomite is heated to 1100 DEG C to 1200 DEG C and becomes calcined dolomite; 2. the calcined dolomite, silicon nitride powder and fluorite powder are weighed, mixed, milled and then pressed into a ball which meets technological requirements; 3. the ball is put into a closed non-metal reduction tank of a micro-wave heating oven to be heated under 1000 DEG C to 1200 DEG C, so that the magnesium compound in the ball reacts with the silicon nitride powder; 4. the vacuum degree of the closed non-metal reduction tank is kept to be 13.3Pa or higher for 4h to 6h; magnesium vapor is condensed in a condenser and becomes crude magnesium; 5. the crude magnesium is heated, melted and refined by solvent, to obtain refined magnesium; 6. acid washing and the like. The method evenly and quickly heats in the principle of micro-wave heating with high heating efficiency, is easy to be controlled, saves production cost, is safe, environment protective and harmless.
Description
Technical field
The present invention relates to a kind of processing method of production of magnesium by pidgeonprocess, especially microwave heating technique is applied to the processing method of Pidgeon process (also being silicothermic process) refining magnesium.
Background technology
Pidgeon process production MAGNESIUM METAL is to be that raw material, ferrosilicon are that reductive agent, fluorite are catalyzer with the calcined dolomite, carries out batching, proportionally mixes after the batching.Suppress balling-up behind the grinding, be called pelletizing.With pelletizing pack into the reduction jar in, be heated to 1200 ℃, inside is evacuated to 13.3Pa or higher, then produces magnesium vapor.Magnesium vapor forms crystallization magnesium in the condenser of reduction jar front end, also claim crude magnesium.Again through flux-refining, output commodity magnesium ingot, promptly smart magnesium.Production of magnesium by pidgeonprocess main chemical reactions formula is:
(1) rhombspar is calcined in rotary kiln, shaft furnace or sleeve kiln:
(2) reduction reaction in the reduction jar
Traditional technology is to the type of heating of reduction jar, be heating unit to be set in the outside of reduction jar, the heating of employing external heating, by thermal conduction add the thermal reduction jar with and interior pelletizing material, its deficiency is mainly reflected in following several aspect: 1, energy consumption is big, the heat energy utilization rate is low, approximately have only about 24%, normally directly adopt coal-fired or fire coal is converted into the heating that acts as a fuel behind the coal gas and use, 1 ton of MAGNESIUM METAL of every production approximately needs 10 tons of fat coals, calculate if press the coal power generation coal consumption of 2.5kwh/kg, being equivalent to power consumption is 25000kwh, has consumed a large amount of resources.2, the refining magnesium cycle long, needs 8～12 hours.3, owing to adopt indirect heating, inside vacuumizes, and now is easy to oxidizedly with heating resisting metal reduction jar, produces distortion etc., and work-ing life is short, the longest use 2 months.Need to change continually the reduction jar that burns out, increase cost, reduce work efficiency.4, in the smelting reducing operation, produced environmentally harmful effluent discharge such as a large amount of carbonic acid gas and flue dust, polluted environment.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art production of magnesium by pidgeonprocess technology, the technology of the smelting magnesium by microwave heating Pidgeon process of a kind of thermo-efficiency height, save energy, low, the no carbonic acid gas of smelting cost and soot emissions is provided.
Technical scheme of the present invention: the technology of smelting magnesium by microwave heating Pidgeon process comprises the steps:
1, dolomite calcination: rhombspar is heated to 1100～1200 ℃ in rotary kiln, shaft furnace or sleeve kiln, burns till and forge white (MgOCaO);
2, batching system ball: will forge white, ferrosilicon powder and fluorite powder batching, grinding, and be pressed into the pelletizing that meets processing requirement then;
3, pelletizing is placed in the airtight nonmetal reduction jar in the microwave oven, starting microwave oven heats pelletizing, Heating temperature reacts magnesium compound and ferrosilicon powder in the pelletizing between 1000 ℃～1200 ℃, and the MAGNESIUM METAL that reaction generates exists with the form of magnesium vapor;
4, the vacuum tightness that keeps airtight nonmetal reduction jar is to 13.3Pa or higher, and the time length is at 4～6 hours, and magnesium vapor becomes crude magnesium after the condensation being connected, being arranged in the condenser of microwave oven outside with airtight nonmetal reduction jar front end;
5, with the crude magnesium heat fused, under 680 ℃～750 ℃ temperature, after solvent refined, cast magnesium ingot, obtain smart magnesium.
The technology of smelting magnesium by microwave heating Pidgeon process of the present invention with respect to prior art, has following characteristics:
1, utilize the principle of microwave heating, in a single day heated object puts into microwave electric field, and polar molecule wherein and non-polar molecule just cause polarization, become even molecule.According to the direction of an electric field orientation, because this electric field belongs to alternating electric field, so dipole just causes rotation and vibrations along with electric field change, for example frequency is 2.45GHz, rotation and vibrations with per second 2,400,000,000 5 thousand ten thousand times, produced the effect that is similar to phase mutual friction between the molecule, thereby absorbed the energy of electric field and generate heat, made object itself become heating element.Do not need heat conducting process, therefore can reach even rapid heating at short notice, the heating efficiency height makes heating object can reach required temperature fast.Reduce the reduction reaction time, thereby shorten the whole refining magnesium cycle, can shorten to 4～6 hours from original 8～12 hours.
2, microwave has different effects to different substances, contains the polar material and absorbs microwave energy easily and generate heat.Therefore do not contain polarity and then seldom absorb microwave heating, heat with strong pointsly, the ineffectivity of other dielectric material heating is improved greatly.Heat utilization efficiency significantly improves, and makes reduction reaction finish fully fast, reduces production energy consumption.
3, be easy to control; Only to object heating itself, air heats hardly in body of heater, the furnace chamber, so thermal inertia is minimum when heating, and appliance computer control is suitable for the standard and the automatization control of heat-processed and heating process especially.
4, substituted original heat-resistance stainless steel reduction jar with nonmetal reduction jar, improve the work-ing life of reduction jar, reduced the consumption of reduction jar, saves production cost.
5, safe, environmentally friendly; Usually micro-wave energy is to work in metal closed heating He in the waveguide, so the leakage of energy is minimum, the microwave leakage amount is all in the safety standards scope that country formulates.Adopt microwave heating, do not produce environmentally harmful effluent discharge such as carbonic acid gas, cinder and flue dust, free from environmental pollution, environment protection is had outstanding effect.
Embodiment
The technology of smelting magnesium by microwave heating Pidgeon process of the present invention comprises the steps:
1, dolomite calcination: rhombspar is heated to 1100～1200 ℃ in rotary kiln, shaft furnace or sleeve kiln, burns till and forge white (MgOCaO);
2, batching system ball: will forge white, ferrosilicon powder and fluorite powder batching, grinding, and be pressed into the pelletizing that meets processing requirement then; The above-mentioned proportion scale of forging white, ferrosilicon powder and fluorite powder adopts the proportion scale of prior art;
3, pelletizing is placed in the airtight nonmetal reduction jar in the microwave oven, starting microwave oven heats pelletizing, Heating temperature reacts magnesium compound and ferrosilicon powder in the pelletizing between 1000 ℃～1200 ℃, and the MAGNESIUM METAL that reaction generates exists with the form of magnesium vapor; Available temperature is 1000 ℃, 1050 ℃, 1100 ℃, 1130 ℃, 1150 ℃, 1180 ℃, 1200 ℃ etc.
4, the vacuum tightness that keeps airtight nonmetal reduction jar is to 13.3Pa or higher, and the time length is at 4～6 hours, and magnesium vapor becomes crude magnesium after the condensation being connected, being arranged in the condenser of microwave oven outside with airtight nonmetal reduction jar front end; The available time period is 4 hours, 4.5 hours, 5 hours, 5.5 hours equal times;
5, with the crude magnesium heat fused, under 680 ℃～750 ℃ temperature, after solvent refined, cast magnesium ingot, obtain smart magnesium.Available temperature is 680 ℃, 700 ℃, 720 ℃, 740 ℃, 750 ℃ etc.
6, pickling: magnesium ingot with sulfuric acid or nitric acid clean surface, is removed the surface and is mingled with, make surface aesthetic.
7, other explanation: airtight reduction jar is a nonmetallic ceramics class container, and refractoriness is greater than 1350 ℃, and intensity can satisfy the following vacuum tightness service requirements of 13.3Pa, has good microwave penetration performance, suitable microwave heating technique requirement.The reduction jar adopts the flangeseal mode of connection with condenser, reaches the vacuum tightness service requirements.The microwave frequency range that microwave heating is used is: 915 megahertzes and 2450 megahertzes.
Claims (3)
1. the technology of smelting magnesium by microwave heating Pidgeon process is characterized in that comprising the steps:
(1), dolomite calcination: rhombspar is heated to 1100～1200 ℃ in rotary kiln or shaft furnace, burns till and forge white (MgOCaO);
(2), batching system ball: will forge white, ferrosilicon powder and fluorite powder batching, grinding, and be pressed into the pelletizing that meets processing requirement then;
(3), pelletizing is placed in the airtight nonmetal reduction jar in the microwave oven, starting microwave oven heats pelletizing, Heating temperature reacts magnesium compound and ferrosilicon powder in the pelletizing between 1000 ℃～1130 ℃, and the MAGNESIUM METAL that reaction generates exists with the form of magnesium vapor;
(4), the vacuum tightness that keeps airtight nonmetal reduction jar is to 13.3Pa or higher, the time length is at 4～6 hours, magnesium vapor becomes crude magnesium after the condensation being connected, being arranged in the condensing works of microwave oven outside with airtight nonmetal reduction jar front end;
(5), with the crude magnesium heat fused, under 680 ℃～750 ℃ temperature, after solvent refined, cast magnesium ingot, obtain smart magnesium.
2. the technology of smelting magnesium by microwave heating Pidgeon process according to claim 1 is characterized in that: the microwave frequency range that described microwave oven uses is: 915 megahertzes and 2450 megahertzes.
3. the technology of smelting magnesium by microwave heating Pidgeon process according to claim 1 and 2 is characterized in that: described reduction jar is a nonmetallic ceramics class container, and reduction jar is connected with condenser employing flangeseal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102328551A CN101376928B (en) | 2008-10-10 | 2008-10-10 | Process for smelting magnesium by microwave heating Pidgeon process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102328551A CN101376928B (en) | 2008-10-10 | 2008-10-10 | Process for smelting magnesium by microwave heating Pidgeon process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101376928A CN101376928A (en) | 2009-03-04 |
| CN101376928B true CN101376928B (en) | 2011-01-12 |
Family
ID=40420667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102328551A Expired - Fee Related CN101376928B (en) | 2008-10-10 | 2008-10-10 | Process for smelting magnesium by microwave heating Pidgeon process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101376928B (en) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892395B (en) * | 2010-06-12 | 2013-01-09 | 安泰科技股份有限公司 | Method for smelting magnesium by decomposition in vacuum through microwaves |
| CN102409185A (en) * | 2011-11-14 | 2012-04-11 | 宁夏华亿镁业股份有限公司 | Novel reduction method in Pidgeon magnesium smelting process |
| CN102534254A (en) * | 2012-03-28 | 2012-07-04 | 瓮福（集团）有限责任公司 | Method with high magnesium phosphorus gangue as raw materials to prepare metal magnesium |
| CN102534253A (en) * | 2012-03-28 | 2012-07-04 | 瓮福（集团）有限责任公司 | Method using high magnesium phosphorus gangue smelting reduction to prepare metal magnesium |
| CN103602833B (en) * | 2013-11-15 | 2015-02-25 | 吴永 | Improved pidgeon-process magnesium refining process |
| CN103589879A (en) * | 2013-11-20 | 2014-02-19 | 北京环宇冠川等离子技术有限公司 | Magnesium metal smelting method and device employing plasma torch heating technology |
| CN103882247B (en) * | 2014-04-10 | 2015-09-02 | 于洪喜 | Microwave heating refining magnesium technology |
| CN105420516B (en) * | 2015-11-09 | 2017-11-21 | 孙克本 | The new process of continuity method electric furnace smelting magnesium metal |
| JP2017088974A (en) * | 2015-11-13 | 2017-05-25 | オリコン・エナジー株式会社 | Magnesium smelting apparatus and smelting method using microwaves |
| CN105567969B (en) * | 2015-12-17 | 2018-06-08 | 于洪喜 | Microwave carbon method process for smelting magnesium |
| JP5945373B1 (en) * | 2016-01-13 | 2016-07-05 | オリコン・エナジー株式会社 | Magnesium smelting apparatus and smelting method using microwaves |
| JP6077164B1 (en) * | 2016-06-10 | 2017-02-08 | オリコン・エナジー株式会社 | Smelting raw material pellet having resonance structure and smelting raw material using the same |
| CN106282605A (en) * | 2016-09-14 | 2017-01-04 | 李华梅 | Magnesium oxide produces magnesium metal with carbon with vacuum microwave heating |
| CN106498185B (en) * | 2016-11-01 | 2018-08-31 | 深圳市中启新材料有限公司 | A kind of method of vacuum microwave refining magnesium |
| CN107400789A (en) * | 2017-01-18 | 2017-11-28 | 青海丰瑞镁业有限公司 | A kind of magnesium crystal filter and crude magnesium reduction filtering purifying technique |
| CN107058762A (en) * | 2017-05-09 | 2017-08-18 | 安徽工业大学 | It is a kind of for pelletizing of smelting magnesium and preparation method thereof |
| CN107090547A (en) * | 2017-05-17 | 2017-08-25 | 西安建筑科技大学 | It is a kind of to reduce the method that magnesium process prepares AL-Si-Fe alloy and reduces magnesium in Pidgeon process |
| CN109055779A (en) * | 2018-09-19 | 2018-12-21 | 成都先进金属材料产业技术研究院有限公司 | The method of refining of magnesium refining agent and preparation method thereof and high purity magnesium |
| CN109930001A (en) * | 2019-04-28 | 2019-06-25 | 府谷县泰达煤化有限责任公司 | Mg9995B and the above primary magnesium ingot production technology |
| CN112267018A (en) * | 2020-09-29 | 2021-01-26 | 朱广东 | Aluminum magnesium co-production process |
| CN113737019B (en) * | 2021-08-25 | 2022-06-21 | 西安交通大学 | Method and device for continuous extraction of crystalline magnesium in Pidgeon magnesium smelting process at high temperature |
| CN113774235B (en) * | 2021-08-25 | 2022-06-21 | 西安交通大学 | Method and device for intermittently and continuously extracting crystallized magnesium in Pidgeon magnesium smelting |
| CN114892026B (en) * | 2022-04-22 | 2024-06-11 | 五台云海镁业有限公司 | Improved Pidgeon process magnesium smelting production process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457173Y (en) * | 2000-10-30 | 2001-10-31 | 祁孙成 | Vacuum smelting furnace for high-purity metal magnesium |
-
2008
- 2008-10-10 CN CN2008102328551A patent/CN101376928B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457173Y (en) * | 2000-10-30 | 2001-10-31 | 祁孙成 | Vacuum smelting furnace for high-purity metal magnesium |
Non-Patent Citations (5)
| Title |
|---|
| 徐日瑶.硅热法炼镁生产工艺学.《硅热法炼镁生产工艺学》.中南大学出版社,2003,54-57，109，101，120-124. * |
| 朱祖武等.国内皮江法炼镁技术的缺陷与改进途径.南昌高专学报 2.2007,(2),92-94. |
| 朱祖武等.国内皮江法炼镁技术的缺陷与改进途径.南昌高专学报 2.2007,(2),92-94. * |
| 郑英等.微波在矿物处理过程中的应用.铀冶金21 3.2002,21(3),151-153. |
| 郑英等.微波在矿物处理过程中的应用.铀冶金21 3.2002,21(3),151-153. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101376928A (en) | 2009-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101376928B (en) | Process for smelting magnesium by microwave heating Pidgeon process | |
| CN102320806B (en) | Micronano superfine powder high-temperature high-radiance paint and preparation method thereof | |
| CN106498185B (en) | A kind of method of vacuum microwave refining magnesium | |
| Wu et al. | Preparation and thermal shock resistance of cordierite-spodumene composite ceramics for solar heat transmission pipeline | |
| CN103708455A (en) | Method for preparing calcium carbide | |
| CN101967566B (en) | Process for preparing metal magnesium by normal pressure thermal reduction method | |
| WO2020057094A1 (en) | Silicon carbide closed-cell ceramic prepared by using industrial silicon-based waste residue and preparation method therefor | |
| CN101985701B (en) | Method for reducing calcined magnesite by using calcium carbide under normal pressure | |
| CN101016590A (en) | Method of preparing lithium from spodumene concentrate | |
| CN107285778B (en) | Preparation method of high-temperature-resistant forsterite type refractory material | |
| CN102689882B (en) | Method for producing yellow phosphorus by virtue of low grade phosphate rotary hearth furnace method | |
| CN103896605B (en) | A kind of method of kyanite synthesis of dichroite-mullite composite | |
| CN101892395B (en) | Method for smelting magnesium by decomposition in vacuum through microwaves | |
| CN103352128A (en) | Direct zinc-coal mixing cyclone burning type zinc oxide production system | |
| CN101602609B (en) | A kind of method for preparing Fe-Si3N4 refractory material | |
| CN106756107A (en) | A kind of vacuum microwave magnesium smelting device | |
| CN104477862A (en) | Method and raw material for producing yellow phosphorus or phosphoric acid by adopting rotary kiln | |
| CN109748281A (en) | A method for preparing high-quality silicon carbide by using waste silicon micropowder | |
| CN105567969A (en) | Magnesium smelting process with microwave carbon method | |
| CN101857439A (en) | A method for synthesizing SiC powder from gold ore tailings | |
| CN103708459A (en) | Method for preparing calcium carbide | |
| JP2014084501A (en) | Magnesium vapor condensation device | |
| CN102776389A (en) | Method for using thermal-state magnesium slag afterheat and moving bed | |
| WO2024056107A1 (en) | Green and environmentally friendly method for producing magnesium by means of aluminothermic reduction | |
| CN101654373A (en) | Method for preparing Fe-Sialon spinel complex phase fire-proof material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHONGQING KEJIAN METALLURGY MATERIAL CO., LTD. Free format text: FORMER OWNER: CHONGQING GAOLING INVESTMENT (GROUP) CO., LTD. Effective date: 20140724 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 400080 DADUKOU, CHONGQING TO: 401258 CHANGSHOU, CHONGQING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140724 Address after: 401258, Changshou District, Chongqing City Jiangnan District Street, steel auxiliary road three, No. 2 Patentee after: Chongqing Kejian Metallurgy Material Co., Ltd. Address before: Eight town 400080 Dadukou District of Chongqing Patentee before: Chongqing Gaoling Investment (Group) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20151010 |
|
| EXPY | Termination of patent right or utility model |