CN1345982A - Internal heating method magnesium-smelting productive technology and equipment - Google Patents
Internal heating method magnesium-smelting productive technology and equipment Download PDFInfo
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- CN1345982A CN1345982A CN 00124698 CN00124698A CN1345982A CN 1345982 A CN1345982 A CN 1345982A CN 00124698 CN00124698 CN 00124698 CN 00124698 A CN00124698 A CN 00124698A CN 1345982 A CN1345982 A CN 1345982A
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- magnesium
- radiator tube
- reduction reactor
- heater
- wall
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003723 Smelting Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 title claims abstract description 13
- 238000005516 engineering process Methods 0.000 title claims description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 53
- 239000011777 magnesium Substances 0.000 claims abstract description 53
- 238000006722 reduction reaction Methods 0.000 claims abstract description 36
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000008188 pellet Substances 0.000 claims abstract description 8
- 230000002829 reductive effect Effects 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000010992 reflux Methods 0.000 claims abstract description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 8
- 230000008025 crystallization Effects 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000005453 pelletization Methods 0.000 claims description 5
- 230000003134 recirculating effect Effects 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 238000007670 refining Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000001354 calcination Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 206010022000 influenza Diseases 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002796 Si–Al Inorganic materials 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a magnesium-smelting process by using internal heating method and its equipment. It is characterized by that the pellet made up by using magnesium oxide and silicon iron can be placed in an internal vacuum magnesium reduction reaction kettle enveloped in refluxing hot air, and heated to 1180-1200 deg.c by means of radiation tubes which are passed through the reduction reaction kettle, arranged in the mode of concentric circles and communicated with combustion chamber, the degree of vacuum in the kettle is below 13.33 Pa, then the above-mentioned material can be reduced, and formed into metal magnesium. Its process is simple, and its equipment is reasonable and simple, its magnesium yield can be raised by 15-209%, and its purity can be up to 99.98%.
Description
The present invention relates to a kind ofly do raw material with magnesium-containing ore, ferrosilicon is made reductive agent, and fuel is done the Inner Heating Magnesium Refining Production Technology And Apparatus of heating source.
At present, method for smelting magnesium by hot is that it is the reduction reaction of reductive agent with Si-Al that Pi Jiang utilizes the achievement in research MgO of gentle I Bei Shefu of the peace base of a fruit with the longest historical silicothermic process " Pi Jiang " explained hereafter MAGNESIUM METAL both at home and abroad.Study successful suitability for industrialized production MAGNESIUM METAL first in Canada (pidgeon), so be " Pi Jiang " method.Its technology essence be at 1200 ℃, minimum vacuum pressure under 13.33Pa (0.1 mmhg), in the horizontal jar inside and outside heating of heat-resisting alloy steel, with rhombspar (forging white) the refining magnesium of ferrosilicon (75%Si) reduction calcination.Pointed out in the skin river afterwards: " best silicothermic process is still in continuing to seek ".The disadvantage of Pidgeon process is, outer heating, interior vacuum, and expensive jar is easily inhaled flat, and the heat conduction radius is big, and the recovery time is long, and economic benefit is undesirable.Have only in the world that the lucky wind of Japan is grand male imagine with a perpendicular jar continuous production MAGNESIUM METAL technology, do not destroy under the condition of the interior vacuum of magnesium vapor jar and react.But, do not implement successfully afterwards because of its technical process and equipment have many still unsolved difficult problems.A lot of vacuum electric furnace process for smelting magnesium are also arranged in the world, because it is low to go out magnesium purity, power consumption is big, and is use and few.
Purpose of the present invention is designed a kind of interval operation exactly, uses flame heating, heats up in the middle of reducing material, realizes the production technique and the equipment of synthesis by internal resistance electric melting refining magnesium under vacuum condition.
Technology of the present invention is achieved in that makes pelletizing with magnesium oxide and ferrosilicon; putting into one places among the reflux heat gas bag encloses; radiator tube therefrom passes; and also react in the former still with the magnesium that the concentric(al) circles mode is arranged; incendiary furnace gas from radiator tube, passing from bottom to top; endoporus by radiator tube is passed to heat the magnesium pellet group that places radiator tube outer; be heated to 1180-1200 ℃ with being accumulated in the outer magnesium pellet group of radiator tube; under the condition of reduction reaction still vacuum tightness, be reduced into MAGNESIUM METAL less than 13.33Pa; the furnace gas that passes from radiator tube is separated out from the radiator tube upper end; discharge return the lower end of magnesium reduction reactor along the outer wall of magnesium reduction reactor after, the outer wall of magnesium reduction reactor is remained in 1000-1150 ℃ the waste heat protection.
The equipment of realizing internal heating method magnesium-smelting productive technology of the present invention is an internally heated type Mg-smelting furnace, it is by magnesium reduction reactor, crystallizer, combustion chamber, charging dreg removing system, and firing system, pumped vacuum systems, recirculating cooling water system, instrument automation systems etc. partly form.Its constructional feature is: it is the shell that is made of body of heater fireproof insulation brick, the bottom constitutes combustion chamber and smoke outlet flue in the body of heater, the magnesium reduction reactor is placed in the intravital top of stove, constitute an air-returen flue between the simplified outer wall of reduction reaction still and the inwall of body of heater shell, air-returen flue is communicated with smoke outlet flue, and magnesium reduction reactor upper end is hung on the furnace wall.The magnesium reduction reactor is made of cylindrical shell and radiator tube, and radiator tube passes from the reduction reaction still, and arranges in still in concentrically ringed mode, and the radiator tube lower end is communicated with the combustion chamber, and the upper end is communicated with air-returen flue, and expansion joint is housed on the cylindrical shell.The input and output material system be by one be installed in the reactor center can lifting sleeve pipe, be installed in the sliding plate on the outer tube wall, the hopper door that the bottom of pipe lower end is provided with the switch door in being installed in constitutes.At the body of heater top or the side magnesium crystallizer is installed, it is the crystallization cover that is connected by with the magnesium reduction reactor, is enclosed within the condenser that the crystallization cover is outer and link to each other with recirculating cooling water system, the vacuum interface that links to each other with vacuum system formation.Magnesium pellet group is packed in the reduction reaction still with feeder, close condenser cover, magnesium vapor is vacuumizing under the power effect, and crystallization puts in crystallizer, and temperature remains on 450-550 ℃.Reduction reaction finishes after 4 hours, and automatic slag-draining device is opened, and by the ash gate deslagging, goes round and begins again, and continuously obtains ring magnesium.
Inner Heating Magnesium Refining Production Technology And Apparatus list furnace output of the present invention is big, and the recovery time is short, ferrosilicon utilization ratio height, the thermo-efficiency height, energy-conservation 60-70% goes out the magnesium yield and improves 15-20%, and purity can reach 99.98%, cost descends 25%, reasonable in design, simple in structure, less investment, equipment is few, has realized big industrial production and control automatically.
Accompanying drawing: internal heat type Mg-smelting furnace structural representation.
Wherein: 1. vacuum interface, 2. cover in the crystallization, 3. condenser, 4. recirculating cooling water system, 5. the magnesium crystallizer, 6. opening for feed, 7. shell, 8. hanger, 9. the magnesium reduction reactor, 10. in radiator tube, 11. expansion joints, 12. outer tubes, 13. pipes, 14. sliding plates, 15. hoppers, 16. hopper doors, 17. slag notches, 18. ash gates, 19. firing systems, 20. smoke outlet flues, 21. dividing plates, 22. combustion chambers, 23. air-returen flues, 24. cylindrical shells, 25. manage, 26. top covers.
Embodiment 1
With reference to the accompanying drawings the structure of internally heated type Mg-smelting furnace of the present invention is described in detail below.
Be built into the shell (7) of body of heater with fireproof insulation brick, be separated into three spaces with refractory brick in the body of heater, two spaces, below are respectively combustion chamber (22) and smoke outlet flue (20), smoke outlet flue one end communicates with the interior space of the body of heater of top, combustion chamber, one end is communicated with outward with body of heater, on the dividing plate (21) of combustion chamber and superjacent air space, stay one with the identical circular hole of magnesium reduction reactor diameter, the side in the combustion chamber is opened a hole and is docked with firing system (19) on the body of heater shell.Make the cylindrical shell (24) of magnesium reduction reactor (9) with high-temperature alloy steel, the expansion joint (11) of on cylindrical shell, burn-oning, determine the quantity of radiator tube according to designing the required heat of turnout, radiator tube be arranged in the cylindrical shell in concentrically ringed mode that radiator tube (10) two ends are passed from the cylindrical shell two ends respectively.Weld two extra heavy pipes respectively at center, cylindrical shell two ends as opening for feed (6) and slag notch (17), and with reactor in be interlinked to the outside.The charging deslagging sleeve pipe of an energy lifting is installed at the center in reactor, sliding plate (14) is fixed on the outer wall of outer tube (12) lower end, hopper (15) is fixed on interior pipe (13) lower end, establish a hopper door (16) in feed hopper bottom, establish a cleanout door (18) in the lower end of slag notch, the reactor for preparing is installed in the upper space of body of heater, make the inwall and the reactor cylinder body outer wall of body of heater form an air-returen flue (23), the upper end of reactor is fixed on the furnace wall by hanger (8), the bottom is passed dividing plate hole, combustion chamber and is placed the combustion chamber, slag notch passes the bottom, combustion chamber and is in communication with the outside by ash gate, and opening for feed passes body of heater top cover (26) and is in communication with the outside by dog-house.Upper side or top at reactor connect a pipe (25), passing the body of heater shell is connected with the interior cover of crystallization (2) of magnesium crystallizer (5), condenser (3) is enclosed within the crystallization and puts, and be connected with recirculating cooling water system (4), on the magnesium crystallizer, establish one and vacuumize interface (1), be connected with pumped vacuum systems.
Embodiment 2:
Get 10000 kilograms of rhombspars, be broken into the 5-10mm fritter, the special shaft furnace of packing into obtains high reactivity and forges white (CaOMgO) 5400 kilograms 1000-1100 ℃ of calcining down, forge whitely through the ball mill abrasive dust, powder (CaOMgO) adds ferrosilicon (75%Si) and adds fluorite powder (95%CaF
2) mixing briquetting, pelletizing pressure is 1.5-2t/cm
2, the vacuum of packing into still is sent in the magnesium reduction reactor of embodiment 1 described internally heated type Mg-smelting furnace, under 1200 ℃, keeps vacuum tightness to be not less than 13.33Pa, obtains ring magnesium, adds flux-refining, ingot casting, obtains commercial magnesium.Reducing slag (2Ca.SiO
2) can make byproduct usefulness.Can obtain 99.98%, 800 kilograms of MAGNESIUM METAL through calcining in 4 hours.
Embodiment 3:
Get and forge white 5400 kilograms, make magnesium pellet group according to the program of embodiment 2, pelletizing is sent in the internally heated type Mg-smelting furnace reduction reaction still of embodiment 1, under 1190 ℃ and 4.00Pa vacuum tightness, carry out reduction reaction, still obtain 800 kilograms of MAGNESIUM METAL, through 4 hours one-period.
Embodiment 4:
Get and forge white 5400 kilograms, make magnesium pellet group, pelletizing is sent in the internally heated type Mg-smelting furnace reduction reaction still of embodiment 1 by the program of embodiment 2, under 1180 ℃ and 2.67Pa vacuum tightness, carry out reduction reaction, still obtain 800 kilograms of MAGNESIUM METAL, and better quality, through 4 hours one-period.
Claims (2)
1. do raw material with magnesium-containing ore for one kind, ferrosilicon is made reductive agent, and fuel is done the internal heating method magnesium-smelting productive technology of heating source, it is characterized in that:
Magnesium oxide and ferrosilicon are made pelletizing to be put into one and places among the reflux heat gas bag encloses; radiator tube therefrom passes; and in the magnesium reduction reactor of arranging in the concentric(al) circles mode; incendiary furnace gas from radiator tube, passing from bottom to top; endoporus by radiator tube is passed to heat the magnesium pellet group that places radiator tube outer; be heated to 1180-1200 ℃ with being accumulated in the outer magnesium pellet group of radiator tube; under the condition of reduction reaction still vacuum tightness, be reduced into MAGNESIUM METAL less than 13.33Pa; the furnace gas that passes from radiator tube is separated out from the radiator tube upper end; discharge return the lower end of magnesium reduction reactor along the outer wall of magnesium reduction reactor after, the outer wall of magnesium reduction reactor is remained in 1000-1150 ℃ the waste heat protection.
2. do raw material with magnesium-containing ore for one kind, ferrosilicon is made reductive agent, and fuel is done the internally heated type Mg-smelting furnace of heating source, it is characterized in that:
It is the shell that is made of body of heater fireproof insulation brick, the bottom constitutes combustion chamber and smoke outlet flue in the body of heater, the magnesium reduction reactor is placed in the intravital top of stove, constitute an air-returen flue between the inwall of the cylinder body outer wall of reduction reaction still and body of heater shell, air-returen flue is communicated with smoke outlet flue, and magnesium reduction reactor upper end is hung on the furnace wall;
The magnesium reduction reactor is made of cylindrical shell and radiator tube, and radiator tube passes from the reduction reaction still, and arranges in still in concentrically ringed mode, and the radiator tube lower end is communicated with the combustion chamber, and the upper end is communicated with air-returen flue, and expansion joint is housed on the cylindrical shell;
The input and output material system be by one be installed in the reactor center can lifting sleeve pipe, be installed in the sliding plate on the outer tube wall, the hopper door that the bottom of pipe lower end is provided with the switch door in being installed in constitutes;
At the body of heater top or the side magnesium crystallizer is installed, it is the crystallization cover that is connected by with the magnesium reduction reactor, is enclosed within the condenser that the crystallization cover is outer and link to each other with recirculating cooling water system, the vacuum interface that links to each other with vacuum system formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001246984A CN1163622C (en) | 2000-09-29 | 2000-09-29 | Internal heating method magnesium-smelting productive technology and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001246984A CN1163622C (en) | 2000-09-29 | 2000-09-29 | Internal heating method magnesium-smelting productive technology and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1345982A true CN1345982A (en) | 2002-04-24 |
| CN1163622C CN1163622C (en) | 2004-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001246984A Expired - Fee Related CN1163622C (en) | 2000-09-29 | 2000-09-29 | Internal heating method magnesium-smelting productive technology and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1163622C (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008022546A1 (en) * | 2006-08-15 | 2008-02-28 | Mg Century Mining Corporation | A reducer, manufacture process thereof, and a reducing furnace for vacuum smelting metal using the reducer |
| US20090010837A1 (en) * | 2005-03-18 | 2009-01-08 | Tokyo Institute Of Technology | Hydrogen Generation Apparatus, Laser Reduction Apparatus, Energy Conversion Apparatus, Hydrogen Generation Method and Electric Power Generation System |
| CN101956083A (en) * | 2010-10-29 | 2011-01-26 | 曲智 | Process method and equipment for smelting magnesium by using magnesite with one-step method |
| CN101210283B (en) * | 2006-12-31 | 2011-03-23 | 贵州世纪天元矿业有限公司 | Vacuum metal smelting heat accumulation reducing furnace system |
| CN101999005A (en) * | 2010-06-07 | 2011-03-30 | 牛强 | A method and equipment for smelting magnesium by vacuum circulation molten silicon thermal method |
| CN101748292B (en) * | 2008-12-15 | 2011-10-19 | 辛卫亚 | Tilting discharge type metal magnesium or calcium reduction method |
| CN101221016B (en) * | 2007-01-08 | 2011-12-28 | 贵州世纪天元矿业有限公司 | Reduction kettle |
| CN101706204B (en) * | 2009-09-11 | 2012-07-25 | 中南大学 | External heat vertical retort magnesium smelting device |
| CN102816938A (en) * | 2012-08-22 | 2012-12-12 | 刘海永 | Reducing furnace for smelting magnesium by electrothermal method |
| CN102994779A (en) * | 2013-01-09 | 2013-03-27 | 九洲资源控股集团有限公司 | Tunnel-type double-circulation vacuum smelting furnace and its method |
| CN103245200A (en) * | 2013-06-05 | 2013-08-14 | 张青选 | Gas kiln provided with radiation pipeline device |
| CN104152719A (en) * | 2014-06-27 | 2014-11-19 | 宁夏太阳镁业有限公司 | Smelting method of calcium metal, magnesium metal and strontium metal |
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| CN101307988B (en) * | 2007-05-18 | 2011-08-10 | 贵州世纪天元矿业有限公司 | Combined method for reducing furnace and calcine furnace and the furnace |
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2000
- 2000-09-29 CN CNB001246984A patent/CN1163622C/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090010837A1 (en) * | 2005-03-18 | 2009-01-08 | Tokyo Institute Of Technology | Hydrogen Generation Apparatus, Laser Reduction Apparatus, Energy Conversion Apparatus, Hydrogen Generation Method and Electric Power Generation System |
| US8137638B2 (en) * | 2005-03-18 | 2012-03-20 | Tokyo Institute Of Technology | Hydrogen generation apparatus, laser reduction apparatus, energy conversion apparatus, hydrogen generation method and electric power generation system |
| WO2008022546A1 (en) * | 2006-08-15 | 2008-02-28 | Mg Century Mining Corporation | A reducer, manufacture process thereof, and a reducing furnace for vacuum smelting metal using the reducer |
| US8142710B2 (en) | 2006-08-15 | 2012-03-27 | Mg Century Mining Corporation | Reduction apparatus, reduction apparatus manufacture method, and vacuum smelting reduction furnace using the same |
| CN101210283B (en) * | 2006-12-31 | 2011-03-23 | 贵州世纪天元矿业有限公司 | Vacuum metal smelting heat accumulation reducing furnace system |
| CN101221016B (en) * | 2007-01-08 | 2011-12-28 | 贵州世纪天元矿业有限公司 | Reduction kettle |
| CN101748292B (en) * | 2008-12-15 | 2011-10-19 | 辛卫亚 | Tilting discharge type metal magnesium or calcium reduction method |
| CN101706204B (en) * | 2009-09-11 | 2012-07-25 | 中南大学 | External heat vertical retort magnesium smelting device |
| CN101999005A (en) * | 2010-06-07 | 2011-03-30 | 牛强 | A method and equipment for smelting magnesium by vacuum circulation molten silicon thermal method |
| WO2011153683A1 (en) * | 2010-06-07 | 2011-12-15 | Niu Qiang | Method for producing metallic magnesium by vacuum circulating silicothermic process and apparatus thereof |
| CN101956083B (en) * | 2010-10-29 | 2011-11-16 | 曲智 | Process method and equipment for smelting magnesium by using magnesite with one-step method |
| CN101956083A (en) * | 2010-10-29 | 2011-01-26 | 曲智 | Process method and equipment for smelting magnesium by using magnesite with one-step method |
| CN102816938A (en) * | 2012-08-22 | 2012-12-12 | 刘海永 | Reducing furnace for smelting magnesium by electrothermal method |
| CN102994779A (en) * | 2013-01-09 | 2013-03-27 | 九洲资源控股集团有限公司 | Tunnel-type double-circulation vacuum smelting furnace and its method |
| WO2014108052A1 (en) * | 2013-01-09 | 2014-07-17 | 九洲资源控股集团有限公司 | Tunnel-type twin-circulation vacuum smelting furnace and method therefor |
| CN102994779B (en) * | 2013-01-09 | 2017-03-01 | 九洲资源控股集团有限公司 | Tunnel-type double-circulation vacuum smelting furnace and its method |
| CN103245200A (en) * | 2013-06-05 | 2013-08-14 | 张青选 | Gas kiln provided with radiation pipeline device |
| CN104152719A (en) * | 2014-06-27 | 2014-11-19 | 宁夏太阳镁业有限公司 | Smelting method of calcium metal, magnesium metal and strontium metal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1163622C (en) | 2004-08-25 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: My friend (Hongkong) Limited Assignor: Yu Hongxi Contract fulfillment period: July 22, 2005 to September 29, 2020 Contract record no.: 051000030069 Denomination of invention: The process and equipment for the production of magnesium by means of internal heating Granted publication date: 20040825 License type: Exclusive license Record date: 20050805 |
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Assignee: Beijing Hong Nianyi Magnesium Technology Co.,Ltd. Assignor: Yu Hongxi Contract fulfillment period: 2008.1.24 to 2027.9.4 Contract record no.: 2008990000147 Denomination of invention: Internal heating method magnesium-smelting productive technology and equipment Granted publication date: 20040825 License type: Exclusive license Record date: 20080624 |
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