WO2009048363A1 - Metallurgical process for producing magnesium - Google Patents
Metallurgical process for producing magnesium Download PDFInfo
- Publication number
- WO2009048363A1 WO2009048363A1 PCT/SE2008/000543 SE2008000543W WO2009048363A1 WO 2009048363 A1 WO2009048363 A1 WO 2009048363A1 SE 2008000543 W SE2008000543 W SE 2008000543W WO 2009048363 A1 WO2009048363 A1 WO 2009048363A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- liquid
- calcium carbide
- charged
- production
- Prior art date
Links
- 238000010310 metallurgical process Methods 0.000 title claims abstract description 5
- 239000011777 magnesium Substances 0.000 title claims description 29
- 229910052749 magnesium Inorganic materials 0.000 title claims description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 14
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910015372 FeAl Inorganic materials 0.000 claims abstract description 11
- 239000010459 dolomite Substances 0.000 claims abstract description 11
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 7
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000391 magnesium silicate Substances 0.000 claims description 4
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 4
- 235000019792 magnesium silicate Nutrition 0.000 claims description 4
- 229910052609 olivine Inorganic materials 0.000 claims description 4
- 239000010450 olivine Substances 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 229910014813 CaC2 Inorganic materials 0.000 abstract description 4
- 239000000395 magnesium oxide Substances 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 7
- 229910052918 calcium silicate Inorganic materials 0.000 description 4
- 239000000378 calcium silicate Substances 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 229910005347 FeSi Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000171 calcio olivine Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
-
- 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
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/06—Dry methods smelting of sulfides or formation of mattes by carbides or the like
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/16—Dry methods smelting of sulfides or formation of mattes with volatilisation or condensation of the metal being produced
Definitions
- This invention relates to a carbothermic metallurgical process for producing liquid primary Mg, in which dolomite is burnt to give a mixed oxide CaO MgO and a production furnace is charged with this mixed oxide together with an FeAl alloy and gaseous Mg is withdrawn from the furnace at atmospheric pressure and condensed to give liquid Mg.
- FeSi is used as a reducing agent to reduce burnt dolomite (CaO-MgO) to gaseous Mg. This is condensed in vacuo to the solid phase and then it has to be melted for refining. The necessity for a vacuum in the processes makes the processes complicated and unreliable. Using FeSi means that the processes are expensive with high energy consumption and high emission of greenhouse gases.
- One aim of the invention is to be able to produce magnesium in a simpler and more reliable process with lower energy consumption, lower processing costs and lower emission of greenhouse gases.
- the process according to the invention involves that a second furnace is charged with coal and with slag from the first furnace, whereby liquid FeAl alloy is reduced out in this second furnace and returned to the production furnace and calcium carbide is tapped from the second furnace, and in that the calcium carbide formed in the second furnace is fed together with minerals of the magnesium silicate type to a third furnace and evaporated Mg from this furnace is condensed to liquid Mg under atmospheric pressure.
- Figure 1 shows a process flow diagram for one embodiment of the invention. Detailed description of the example of the invention shown
- An electric furnace 11 e.g. a direct-current furnace, is charged with granulated FeAl, advantageously containing 25 % by weight Al, and burnt dolomite.
- the crushed burnt dolomite and granulated FeAl are charged together.
- the burnt dolomite originates from a calcining furnace 12 in which the dolomite is burnt to give CaO-MgO (calcined) and FeAl originates from an electric furnace 13 which can be, e.g. a D. C. furnace or a ferro-alloy furnace, such as a shaft furnace for CaC 2 production.
- This furnace 13 is charged with anthracite (coal) and slag from the furnace 11.
- the slag consists of CaO and Al 2 O 3 , with the remainder MgO and FeAl (e.g. 5 % by weight Al) which has been granulated at 19.
- the FeAl tapped from the furnace 13 is granulated at 20 before it is fed to the furnace 11.
- Calcium carbide is formed in the furnace 13 and tapped off.
- Residual magnesium in the slag from the furnace 11 is evaporated in the furnace 13 together with CO and is led through an off-gas flue 14 with a cooler 15 and an electric filter 16.
- Mg and CO in the off gases react upon cooling back to MgO and C, which are collected in the electric filter as solids.
- the mixture of magnesium oxide and coal collected is mixed with the dolomite fed to the calcining furnace. This leaves CO, which is recovered from the off-gas flue and can be used as fuel, as indicated by a flame.
- Magnesium vapour under atmospheric pressure formed in the furnace 11 is conveyed to a condenser 18 in which it condenses to give liquid primary magnesium for further refining directly in its liquid state.
- the calcium carbide, CaC 2 , formed in the furnace 13 can be used directly for the production of magnesium gas in a furnace 17 (e.g. an induction furnace) which is charged with a mixture of crushed magnesium silicate (e.g. olivine) and the calcium carbide crushed at 22, advantageously in the form of briquettes.
- the furnace 17 may be an induction furnace.
- Magnesium in the gas phase from the furnace 17 is led to the condenser 18 for condensation together with the magnesium in the gas phase originating from the furnace 11.
- Other by-products are calcium silicate, Ca 2 SiO 2 in the solid phase and coal in the solid phase.
- the coal may optionally be separated from the calcium silicate and fed to the furnace 13 as fuel.
- Calcium silicate is a valuable mineral.
- the furnace 17 forms one separate process for the production of magnesium and the furnaces 11 ,
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
In a metallurgical process for producing liquid Mg, dolomite is burnt to give a mixed oxide CaO MgO and a production furnace (11) is charged with this mixed oxide together with an FeAl alloy and gaseous Mg is withdrawn from the furnace at atmospheric pressure and condensed to give liquid Mg. A second furnace (13) is charged with coal and with slag from the first furnace (11), whereby liquid FeAl alloy is reduced out in this second furnace and returned to the first furnace and calcium carbide, CaC2, is tapped from the second furnace. The calcium carbide formed in this manner can be used to produce gaseous Mg in a third furnace (17).
Description
Metallurgical process for producing magnesium
Technical field
This invention relates to a carbothermic metallurgical process for producing liquid primary Mg, in which dolomite is burnt to give a mixed oxide CaO MgO and a production furnace is charged with this mixed oxide together with an FeAl alloy and gaseous Mg is withdrawn from the furnace at atmospheric pressure and condensed to give liquid Mg.
Background of the invention and object of the invention
In known pyrometallurgical processes for the production of Mg, FeSi is used as a reducing agent to reduce burnt dolomite (CaO-MgO) to gaseous Mg. This is condensed in vacuo to the solid phase and then it has to be melted for refining. The necessity for a vacuum in the processes makes the processes complicated and unreliable. Using FeSi means that the processes are expensive with high energy consumption and high emission of greenhouse gases.
One aim of the invention is to be able to produce magnesium in a simpler and more reliable process with lower energy consumption, lower processing costs and lower emission of greenhouse gases.
The process according to the invention involves that a second furnace is charged with coal and with slag from the first furnace, whereby liquid FeAl alloy is reduced out in this second furnace and returned to the production furnace and calcium carbide is tapped from the second furnace, and in that the calcium carbide formed in the second furnace is fed together with minerals of the magnesium silicate type to a third furnace and evaporated Mg from this furnace is condensed to liquid Mg under atmospheric pressure.
The invention is defined by the claims.
Brief description of the drawing
Figure 1 shows a process flow diagram for one embodiment of the invention.
Detailed description of the example of the invention shown
An electric furnace 11, e.g. a direct-current furnace, is charged with granulated FeAl, advantageously containing 25 % by weight Al, and burnt dolomite. The crushed burnt dolomite and granulated FeAl are charged together. The burnt dolomite originates from a calcining furnace 12 in which the dolomite is burnt to give CaO-MgO (calcined) and FeAl originates from an electric furnace 13 which can be, e.g. a D. C. furnace or a ferro-alloy furnace, such as a shaft furnace for CaC2 production. This furnace 13 is charged with anthracite (coal) and slag from the furnace 11. The slag consists of CaO and Al2O3, with the remainder MgO and FeAl (e.g. 5 % by weight Al) which has been granulated at 19. The FeAl tapped from the furnace 13 is granulated at 20 before it is fed to the furnace 11. Calcium carbide is formed in the furnace 13 and tapped off. Residual magnesium in the slag from the furnace 11 is evaporated in the furnace 13 together with CO and is led through an off-gas flue 14 with a cooler 15 and an electric filter 16. Mg and CO in the off gases react upon cooling back to MgO and C, which are collected in the electric filter as solids. The mixture of magnesium oxide and coal collected is mixed with the dolomite fed to the calcining furnace. This leaves CO, which is recovered from the off-gas flue and can be used as fuel, as indicated by a flame.
Magnesium vapour under atmospheric pressure formed in the furnace 11 is conveyed to a condenser 18 in which it condenses to give liquid primary magnesium for further refining directly in its liquid state.
The calcium carbide, CaC2, formed in the furnace 13 can be used directly for the production of magnesium gas in a furnace 17 (e.g. an induction furnace) which is charged with a mixture of crushed magnesium silicate (e.g. olivine) and the calcium carbide crushed at 22, advantageously in the form of briquettes. The furnace 17 may be an induction furnace. Magnesium in the gas phase from the furnace 17 is led to the condenser 18 for condensation together with the magnesium in the gas phase originating from the furnace 11. Other by-products are calcium silicate, Ca2SiO2 in the solid phase and coal in the solid phase. The coal may optionally be separated from the calcium silicate and fed to the furnace 13 as fuel. Calcium silicate is a valuable mineral.
Fe and Al circulate between the furnaces 11 and 13 without being consumed.
The furnace 17 forms one separate process for the production of magnesium and the furnaces 11 ,
12, 13 form another separate process for the production of magnesium. CaC2 used in the furnace 17 can be removed from the furnace 13 and granulated at 21. As the production process for producing magnesium with the furnace 17 requires calcium carbide and the process for the production of magnesium with the furnaces 11, 12 and 13 produces calcium carbide, it is advantageous to integrate the two processes so as to obtain an internal cycle of calcium carbide. Both of the processes operate under atmospheric pressure, which simplifies the processes and makes them more reliable.
The carbothermic process for the production of magnesium described has the following overall reaction:
2CaO MgO (burnt dolomite) + Mg2SiO4 (olivine sand) + 4 C = 4 Mg (product 1) + Ca2SiO4
(product 2) + 4 CO (energy)
Claims
Claims
1 A carbothermic metallurgical process for producing liquid primary Mg, in which dolomite is burnt to give a mixed oxide CaO MgO and a production furnace (11) is charged with this mixed oxide together with an FeAl alloy and gaseous Mg is withdrawn from the furnace at atmospheric pressure and condensed to give liquid Mg, characterised in that a second furnace (13) is charged with coal and with slag from the first furnace, whereby liquid FeAl alloy is reduced out in this second furnace and returned to the production furnace (11) and calcium carbide is tapped from the second furnace (13), and in that the calcium carbide formed in the second furnace (13) is fed together with minerals of the magnesium silicate type to a third furnace (17) and evaporated Mg from this furnace is condensed to liquid Mg under atmospheric pressure.
2 A process according to claim 1, characterised in that the magnesium silicate consists of olivine sand.
3 A process according to claim 2, characterised in that crushed calcium carbide and olivine sand are mixed and formed into briquettes which are fed to the third furnace (17).
4 A process according to any one of the preceding claims, characterised in that the off- gases from the second furnace (13) are conveyed to a cooler (15) where evaporated Mg and CO react back to MgO and C and are collected in a filter (16) and returned to a furnace (12) to be burnt together with the dolomite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0702250-2 | 2007-10-09 | ||
| SE0702250A SE0702250L (en) | 2007-10-09 | 2007-10-09 | Metallurgical process for the production of magnesium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009048363A1 true WO2009048363A1 (en) | 2009-04-16 |
Family
ID=40473283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2008/000543 WO2009048363A1 (en) | 2007-10-09 | 2008-10-06 | Metallurgical process for producing magnesium |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE0702250L (en) |
| WO (1) | WO2009048363A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789775A (en) * | 2015-04-10 | 2015-07-22 | 东北大学 | Preparation method and use method of aluminum-containing magnesium-smelting reducing agent |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2224160A (en) * | 1939-06-29 | 1940-12-10 | Dow Chemical Co | Production of magnesium |
| GB543652A (en) * | 1940-09-05 | 1942-03-06 | Dow Chemical Co | Improvements in the production of metallic magnesium |
| US3782922A (en) * | 1967-06-26 | 1974-01-01 | Avery J Miles | Aluminothermic production of magnesium and an oxidic slag containing recoverable alumina |
| US4140523A (en) * | 1977-11-28 | 1979-02-20 | The Dow Chemical Company | Chemicothermal production of magnesium |
| US5476529A (en) * | 1993-11-30 | 1995-12-19 | Pechiney Electrometallurgie | Process for the recovery of magnesium from magnesium alloys waste |
-
2007
- 2007-10-09 SE SE0702250A patent/SE0702250L/en not_active IP Right Cessation
-
2008
- 2008-10-06 WO PCT/SE2008/000543 patent/WO2009048363A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2224160A (en) * | 1939-06-29 | 1940-12-10 | Dow Chemical Co | Production of magnesium |
| GB543652A (en) * | 1940-09-05 | 1942-03-06 | Dow Chemical Co | Improvements in the production of metallic magnesium |
| US3782922A (en) * | 1967-06-26 | 1974-01-01 | Avery J Miles | Aluminothermic production of magnesium and an oxidic slag containing recoverable alumina |
| US4140523A (en) * | 1977-11-28 | 1979-02-20 | The Dow Chemical Company | Chemicothermal production of magnesium |
| US5476529A (en) * | 1993-11-30 | 1995-12-19 | Pechiney Electrometallurgie | Process for the recovery of magnesium from magnesium alloys waste |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789775A (en) * | 2015-04-10 | 2015-07-22 | 东北大学 | Preparation method and use method of aluminum-containing magnesium-smelting reducing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| SE531428C2 (en) | 2009-03-31 |
| SE0702250L (en) | 2009-03-31 |
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