CN114480879A - Method and system for continuously producing magnesium metal - Google Patents
Method and system for continuously producing magnesium metal Download PDFInfo
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- CN114480879A CN114480879A CN202210213762.4A CN202210213762A CN114480879A CN 114480879 A CN114480879 A CN 114480879A CN 202210213762 A CN202210213762 A CN 202210213762A CN 114480879 A CN114480879 A CN 114480879A
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000011777 magnesium Substances 0.000 claims abstract description 107
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 93
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 60
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 58
- 239000000843 powder Substances 0.000 claims abstract description 57
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 53
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000006722 reduction reaction Methods 0.000 claims abstract description 29
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 19
- 239000006227 byproduct Substances 0.000 claims abstract description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 99
- 238000006243 chemical reaction Methods 0.000 claims description 79
- 239000002994 raw material Substances 0.000 claims description 64
- 238000003860 storage Methods 0.000 claims description 46
- 239000003638 chemical reducing agent Substances 0.000 claims description 39
- 238000010924 continuous production Methods 0.000 claims description 30
- 239000002893 slag Substances 0.000 claims description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 229910052593 corundum Inorganic materials 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 229910052596 spinel Inorganic materials 0.000 claims description 13
- 239000011029 spinel Substances 0.000 claims description 13
- 239000010431 corundum Substances 0.000 claims description 12
- -1 magnesium aluminate Chemical class 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000012159 carrier gas Substances 0.000 claims description 6
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 50
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 238000009856 non-ferrous metallurgy Methods 0.000 abstract description 2
- 230000035484 reaction time Effects 0.000 abstract description 2
- 229940091250 magnesium supplement Drugs 0.000 description 82
- 238000009833 condensation Methods 0.000 description 25
- 230000005494 condensation Effects 0.000 description 25
- 238000005266 casting Methods 0.000 description 23
- 238000007599 discharging Methods 0.000 description 23
- 238000002156 mixing Methods 0.000 description 15
- 238000007670 refining Methods 0.000 description 15
- 238000001914 filtration Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 230000009467 reduction Effects 0.000 description 8
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 7
- 238000000746 purification Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000001354 calcination Methods 0.000 description 5
- 239000010459 dolomite Substances 0.000 description 5
- 229910000514 dolomite Inorganic materials 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 235000014380 magnesium carbonate Nutrition 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- 229960002337 magnesium chloride Drugs 0.000 description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 description 3
- 235000011147 magnesium chloride Nutrition 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 1
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 235000012254 magnesium hydroxide Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
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
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a method and a system for continuously producing magnesium metal. The invention provides a method for continuously producing magnesium metal, which comprises the following steps: in flowing protective gas, continuously feeding magnesium oxide powder and aluminum particles into a normal-pressure electric furnace for continuous melting reduction reaction to continuously obtain magnesium steam and byproducts. The mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.6): 1. The method for continuously producing the metal magnesium provided by the invention not only shortens the reduction reaction time of the metal magnesium, but also reduces the material-magnesium ratio of the metal magnesium production. The magnesium vapor obtained by smelting magnesium by the method provided by the invention has high purity, and the condensed magnesium metal liquid can be directly cast into a commercial magnesium ingot or a magnesium rod.
Description
Technical Field
The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a method and a system for continuously producing magnesium metal.
Background
The magnesium has the advantages of light weight, abundant reserves, high specific strength and specific rigidity of magnesium alloy, excellent heat conduction and electric conductivity, good damping and shock absorption and electromagnetic shielding performance, easy processing and forming, easy recovery of waste materials and the like, and is widely applied to the fields of aerospace, military, transportation and the like.
Currently, the industrial production of magnesium mainly includes an electrolytic process and a silicothermic process (Pidgeon process). The electrolysis method generally uses anhydrous magnesium chloride as a raw material, and direct current is introduced from a cathode and an anode of an electrolytic cell containing the magnesium chloride, so that the magnesium chloride is electrolyzed in a molten state, the cathode obtains metal magnesium, and the anode releases chlorine. The process has the disadvantages of complex dehydration process of the magnesium chloride hexahydrate, great treatment difficulty of waste gas, waste water and waste residue, serious corrosion of production equipment and high production cost.
The silicothermic process for smelting magnesium is widely applied due to short process, quick effect, convenient raw materials, flexible production and convenient operation. The silicothermic process uses ferrosilicon as a reducing agent, reduces calcined dolomite at a certain vacuum degree and temperature, reduces magnesium into magnesium vapor, and then condenses to obtain metal magnesium. The silicothermic magnesium smelting method mainly has the following problems: 1) the requirement on raw materials is high, and only dolomite mineral aggregate can be adopted at present; 2) ferrosilicon used as a reducing agent has high cost; 3) the reduction pot has short service life and high production cost; 4) the reduction reaction requires vacuum conditions and can only be carried out discontinuously; 5) the magnesium ratio of the material is up to 6-7: 1, the energy waste and the environmental pollution are serious, and the increase of the magnesium yield is at the cost of sacrificing the environment and resources; 6) the raw materials and the reducing agent react in a solid state, so the reaction speed is slow and the reaction time is long. For this reason, better methods for producing magnesium metal have been sought.
Chinese patent 201510749995.6 discloses a new process for smelting magnesium metal in an electric furnace by a continuous method, which is characterized in that the material is fed from a calcining rotary kiln to a heat-insulating material tank, the material is discharged, the material is fed in a quantitative and sealed manner, then the magnesium steam is reduced to magnesium vapor in the electric furnace smelting under the condition of 1550-1600 ℃, the magnesium cooled by a magnesium vapor crystallizer is liquid magnesium, the liquid magnesium is sucked and injected into a magnesium receiving pot by a vacuum suction and injection pump, and the liquid magnesium in the magnesium receiving pot is transported to a refining workshop by a bottle truck for refining. The slag tapping adopts a forehearth which is arranged in front of the electric furnace and communicated with the electric furnace, and the continuous slag tapping under vacuum is ensured. The method is based on the continuous magnesium smelting of the silicothermic process, the raw materials are still dolomite and ferrosilicon, the vacuum condition is still needed, and only a reduction tank is cancelled. The problem of high magnesium ratio of the materials is not well solved, and the problems of resource waste and environmental pollution still exist due to complex components and large quantity of solid wastes.
Chinese patent 201410345802.6 discloses a method for rapid and continuous magnesium smelting, which comprises the steps of directly pelletizing, pellet calcining, high-temperature reduction of the calcined pellets in flowing argon atmosphere, condensation of high-temperature magnesium steam and the like: mixing dolomite or magnesite with a reducing agent and fluorite in proportion, uniformly mixing, pelletizing, and calcining the pellets in nitrogen or argon atmosphere; secondly, the calcined high-temperature pellets are carried into a reduction furnace under the protection of argon without cooling, and high-temperature reduction reaction is carried out under the protection of flowing argon to obtain high-temperature magnesium steam; and finally, taking the high-temperature magnesium steam out of the high-temperature reduction furnace through argon flow, and condensing to obtain the magnesium metal. The invention adopts a relative vacuum means, cancels a vacuum system and a vacuum reduction tank and realizes the rapid and continuous production of the magnesium metal. However, in the method, a high-pressure ball-making link of the raw materials and the reducing agent still exists, and a calcining link is added. The method uses fluorite and water glass, so that the residue after magnesium smelting has more impurities and low utilization value. And the production links are multiple, the process flow is long, and large-scale continuous production is difficult to realize.
Disclosure of Invention
In view of the above, the invention provides a method and a continuous production system for continuously producing metal magnesium, the method provided by the invention adopts powder and granular raw materials to directly melt and smelt, does not need ball making and agglomeration, does not need calcination, is carried out under normal pressure, and has the advantages of less links in the whole production process, short flow, continuity and uninterrupted; and the production speed is high, the benefit is high, and the large-scale production is easy.
In order to solve the technical problem, the invention provides a method for continuously producing magnesium metal, which comprises the following steps:
taking protective gas as a carrier, continuously feeding magnesium oxide powder and aluminum particles, continuously melting in a closed electric furnace, and continuously carrying out reduction reaction to obtain magnesium vapor, wherein the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.6): 1.
Preferably, the particle size of the magnesium oxide powder is less than or equal to 0.3mm, and the MgO content in the magnesium oxide powder is more than or equal to 95 wt%.
Preferably, the particle size of the aluminum particles is 0.3-10 mm, and the content of Al in the aluminum particles is more than or equal to 95 wt%.
Preferably, the protective gas is a carrier gas fed in a pneumatic mode, and the protective gas is one or more of hydrogen, argon and helium.
Preferably, the smelting reduction reaction also continuously obtains a byproduct, and the byproduct is corundum or magnesium aluminate spinel.
Preferably, when the byproduct is corundum, the mass ratio of the aluminum particles to the magnesium oxide powder is (0.45-0.6): 1.
Preferably, when the byproduct is magnesium aluminate spinel, the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.45): 1.
The invention provides a continuous production system used by the method for continuously producing the magnesium metal in the technical scheme, which comprises the following steps:
the reaction furnace 8 is a normal-pressure closed electric furnace, and the reaction furnace 8 is provided with a plurality of feed inlets, a gas outlet and a slag discharge port 16;
the discharge hole of the raw material and reducing agent conveyor 2 is communicated with the feed hole of the reaction furnace 8;
and a gas storage container 14, wherein a gas outlet of the gas storage container 14 is communicated with a feed inlet of the reaction furnace 8.
Preferably, the device also comprises a pneumatic feeding device 5, wherein the pneumatic feeding device 5 is provided with a feeding hole, a gas inlet and a discharging hole;
the feeding hole of the pneumatic feeding device 5 is communicated with the discharging hole of the raw material and reducing agent conveyer 2;
the gas inlet of the pneumatic feeding device 5 is communicated with the gas outlet of the gas storage container 14;
and the discharge hole of the pneumatic feeding device 5 is communicated with the feed inlet of the reaction furnace 8 through a closed feeding pipeline 6.
The invention provides a method for continuously producing magnesium metal, which comprises the following steps: taking protective gas as a carrier, continuously feeding magnesium oxide powder and aluminum particles, continuously melting in a closed electric furnace, and continuously carrying out reduction reaction to obtain magnesium vapor, wherein the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.6): 1. The method for continuously producing the metal magnesium takes the magnesium oxide powder as the raw material, takes the aluminum particles as the reducing agent and takes the protective gas as the carrier to send the magnesium oxide powder into the closed electric furnace for continuous melting and continuous reduction reaction, does not need vacuum, does not need ball making and agglomeration, and directly melts and smelts the powder raw material. The oxidation-reduction reaction of the magnesium oxide powder and the aluminum particles can be completed within a few seconds in a molten state. The magnesium vapor obtained by smelting magnesium by the method provided by the invention has high purity, and the condensed magnesium metal liquid can be directly cast into a commercial magnesium ingot or a magnesium rod.
Meanwhile, the residual products of the aluminum particles and the magnesium oxide powder after the melting reduction reaction, namely the aluminum oxide and the magnesium oxide which does not participate in the reaction, are directly generated in a melting state to become the fused corundum or fused magnesia-alumina spinel product with higher added value. The method provided by the invention has no solid waste emission and no waste gas emission, and effectively solves the problems of resource waste, energy waste and environmental pollution.
The method for continuously producing the metal magnesium does not need a cosolvent such as fluorite and the like, and does not need a binder such as water glass and the like or a catalyst such as calcium oxide and the like. The reducing agent used in the method is aluminum particles, thus eliminating flammable and explosive risk factors caused by preparing aluminum powder in the method for preparing magnesium by aluminum reduction.
The method for continuously producing the metal magnesium provided by the invention starts from the magnesium oxide powder and the aluminum particles and ends from the commercial magnesium ingot and the byproduct (the electric melting corundum or the electric melting magnesia-alumina spinel), and the whole production process has the advantages of less links, short flow and continuity and uninterrupted. The production speed is high, the benefit is high, and the large-scale production is easy.
The invention provides a continuous production system used by the method for continuously producing the magnesium metal in the technical scheme, which comprises the following steps: the reaction furnace 8 is a normal-pressure closed electric furnace, and the reaction furnace 8 is provided with a plurality of feed inlets, a gas outlet and a slag discharge port; the discharge hole of the raw material and reducing agent conveyor 2 is communicated with the feed hole of the reaction furnace 8; and a gas storage container 14, wherein a gas outlet of the gas storage container 14 is communicated with a feed inlet of the reaction furnace 8. The continuous production system used by the invention does not use vacuum equipment, can continuously produce the metal magnesium, and has the advantages of simplified production equipment, simple production process and high production efficiency.
Drawings
FIG. 1 is a process flow diagram provided by an embodiment of the present invention;
FIG. 2 is a schematic view of a continuous production system for continuously producing magnesium metal provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a continuous production system for continuously producing magnesium metal with a purification and refining apparatus according to an embodiment of the present invention;
1-a first metering feeder, 2-a raw material and reducing agent conveyor, 3-a mixing bin, 4-a third metering feeder, 5-a pneumatic feeding device, 6-a closed feeding pipeline, 7-a tubular electrode, 8-a reaction furnace, 9-a magnesium vapor conveying pipeline, 10-a gas-liquid condensation separator, 11-an ingot casting machine, 12-a gas filtering device, 13-a gas compressor, 14-a gas storage container, 15-a pressure regulating valve, 16-a slag discharging port, 17-a slag receiving container, 18-a magnesium purification refining device, 19-a power grid, 20-a second metering feeder, 21-a power conversion device, 22-a short-net bus, 23-a first raw material storage container and 24-a second raw material storage container.
Detailed Description
The invention provides a method for continuously producing magnesium metal, which comprises the following steps:
continuously feeding magnesium oxide powder and aluminum particles in flowing protective gas, continuously melting in a closed environment, and continuously carrying out reduction reaction to obtain magnesium vapor, wherein the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.6): 1.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art unless otherwise specified.
In the present invention, the magnesium oxide powder is preferably prepared from a magnesium-containing mineral and/or a magnesium-containing compound.
In the present invention, the magnesium-containing mineral preferably comprises one or more of magnesite, brucite, dolomite, serpentine and boromagnesite.
In the present invention, the magnesium-containing compound preferably includes one or more of magnesium nitrate, magnesium sulfate, magnesium carbonate, magnesium chloride, and magnesium hydroxide.
In the present invention, the particle size of the magnesium oxide powder is preferably not more than 0.3mm, and more preferably not more than 0.1 mm.
In the present invention, the MgO content in the magnesium oxide powder is preferably not less than 95 wt%, more preferably not less than 97 wt%.
In the present invention, the particle size of the aluminum particles is preferably > 0.3mm, and more preferably 1 to 10 mm.
In the present invention, the content of Al in the aluminum particles is preferably 95 wt% or more, more preferably 96 wt% or more.
In the present invention, the aluminum particles are preferably waste aluminum particles.
In the present invention, the aluminum particles are preferably subjected to a pretreatment before the continuous feeding, and in the present invention, the pretreatment is preferably pulverization, and in the present invention, the pulverization is preferably performed so that the particle diameter of the aluminum particles satisfies the above requirements.
In the present invention, the melt reduction reaction preferably also continuously gives a by-product, preferably corundum or magnesium aluminate spinel.
In the present invention, when the by-product is fused corundum, the mass ratio of the aluminum particles to the magnesium oxide powder is preferably (0.45 to 0.6):1, and more preferably (0.5 to 0.6): 1.
In the present invention, when the byproduct is fused corundum, the formula of the melting reduction reaction between the aluminum particles and the magnesium oxide powder is shown in formula (1):
3MgO+2Al＝3Mg+Al2O3formula (1).
In the invention, when the byproduct is magnesium aluminate spinel, the mass ratio of the aluminum particles to the magnesium oxide powder is preferably (0.25-0.45): 1, and more preferably (0.25-0.4): 1.
In the present invention, when the byproduct is magnesia-alumina spinel, the melting reduction reaction equation of the aluminum particles and the magnesia powder is shown in formula (2):
4MgO+2Al＝3Mg+Al2O3MgO formula (2).
In the present invention, the shielding gas is a carrier gas that pneumatically transports the powder material into the furnace.
In the present invention, the shielding gas is preferably one or more of hydrogen, argon and helium.
In the invention, the protective gas can smoothly feed the powder raw material into the furnace and generate plasma arc, thereby heating a melting region to ensure that the magnesium oxide powder is melted.
In the present invention, the melting and reduction reaction is preferably carried out in a closed atmosphere at normal pressure.
In the present invention, the melting temperature of the melting and reduction reaction is preferably 2200 ℃ or higher, more preferably 2250 ℃ or higher.
The invention provides a system used by the method for continuously producing the magnesium metal in the technical scheme, which comprises the following steps:
the reaction furnace 8 is a normal-pressure closed electric furnace, and the reaction furnace 8 is provided with a plurality of feed inlets, a gas outlet and a slag discharge port;
the discharge hole of the raw material and reducing agent conveyor 2 is communicated with the feed hole of the reaction furnace 8;
and a gas storage container 14, wherein a gas outlet of the gas storage container 14 is communicated with a feed inlet of the reaction furnace 8.
The continuous production system provided by the present invention preferably further comprises a first raw material storage container 23, and in the present invention, the first raw material storage container 23 is provided with a discharge port. In the present invention, the first raw material storage container is used for storing the magnesium oxide powder.
The continuous production system provided by the invention preferably further comprises a first metering feeder 1, and in the invention, the first metering feeder 1 is provided with a feeding hole and a discharging hole. In the invention, the first metering feeder 1 is used for metering the feeding amount of the magnesium oxide powder.
In the invention, the feeding hole of the first metering feeder 1 is communicated with the discharging hole of the first raw material storage container 23, and the discharging hole of the first metering feeder 1 is communicated with the raw material and reducing agent conveyor 2.
As an embodiment of the present invention, the first metering feeder 1 is disposed above the feeding port of the raw material and reducing agent conveyor 2 along the feeding direction of the raw material and reducing agent conveyor 2.
The continuous production system provided by the present invention preferably further comprises a second raw material storage container 24, and in the present invention, the second raw material storage container 24 is provided with a discharge port. In the present invention, the second raw material storage container is used for storing aluminum particles.
The continuous production system provided by the invention preferably further comprises a second metering feeder 20, and in the invention, the second metering feeder 20 is provided with a feeding hole and a discharging hole. In the present invention, the second metering feeder 20 is used for metering the feeding amount of the aluminum particles.
In the present invention, the feed inlet of the second metering feeder 20 is communicated with the discharge outlet of the second raw material storage container 24, and the discharge outlet of the second metering feeder 20 is communicated with the raw material and reducing agent conveyor 2.
As an embodiment of the present invention, the second metering feeder 20 is disposed above the feeding port of the raw material and reducing agent conveyer along the feeding direction of the raw material and reducing agent conveyer.
The continuous production system provided by the invention comprises a raw material and reducing agent conveyor 2, wherein a discharge hole of the raw material and reducing agent conveyor 2 is communicated with a feed hole of a reaction furnace 8.
In the present invention, the raw material and reducing agent conveyor 2 is used to convey raw material magnesium oxide powder and reducing agent aluminum particles.
As an embodiment of the present invention, the raw material and reducing agent conveyor 2 is a screw conveyor and/or a belt conveyor.
The continuous production system provided by the invention preferably further comprises a mixing bin 3, and in the invention, the mixing bin 3 is provided with a feeding hole and a discharging hole.
In the present invention, the mixing silo 3 is used for temporarily storing the mixture of the magnesium oxide powder and the aluminum particles.
In the invention, the feed inlet of the mixing bin is communicated with the discharge outlet of the raw material and reducing agent conveyor 2.
The continuous production system provided by the present invention preferably further comprises a third metering feeder 4. In the present invention, the third metering feeder 4 is provided with a feed inlet and a discharge outlet.
In the invention, the third metering feeder 4 is used for metering the feeding amount of the magnesium oxide powder and aluminum particle mixture.
In the invention, the feed inlet of the third metering feeder 4 is communicated with the discharge outlet of the mixing bin 3.
The continuous production system provided by the invention preferably further comprises a pneumatic feeding device 5, wherein the pneumatic feeding device 5 is provided with a feeding hole, a gas inlet and a discharging hole.
In the invention, the feeding hole of the pneumatic feeding device 5 is preferably communicated with the discharging hole of the third metering feeder 4.
In the present invention, the gas inlet of the pneumatic feeding device 5 is preferably in communication with the gas outlet of the gas storage vessel 14.
As a specific implementation of the present invention, a pressure regulating valve 15 is disposed at one end of the pipeline, which is communicated with the gas inlet of the pneumatic feeding device 5 and is close to the pneumatic feeding device 5.
In the invention, the discharge hole of the pneumatic feeding device 5 is preferably communicated with the feed hole of the reaction furnace 8.
As a specific embodiment of the invention, the discharge hole of the pneumatic feeding device 5 is communicated with the feed hole of the reaction furnace 8 through a closed feeding pipeline 6.
As a specific embodiment of the invention, the closed charging pipe 6 is a closed flexible charging pipe.
As a specific embodiment of the present invention, the closed feeding pipe 6 is sleeved in the tubular electrode 7, and one end of the tubular electrode 7 extends into the reaction furnace 8.
As an embodiment of the invention, the end of the tubular electrode 7 extending into the reactor is located above the surface of the molten bath in the reactor 8.
The tubular electrode 7 is one of the feed openings of the reactor 8, and is a current path for feeding electric energy into the reactor 8. One end of the tubular electrode 7 extending into the reaction furnace 8 discharges the liquid level of the molten pool of said reaction furnace 8, forming an electric arc, thereby heating the melting zone. As a specific embodiment of the invention, the mixture of the magnesium oxide powder and the aluminum particles in the mixing bin 3 enters the pneumatic feeding device 5 through the third metering feeder, and after the mixture is mixed with the gas in the gas storage container 14 entering the pneumatic feeding device 5 through the pressure regulating valve 15, the mixture is conveyed by the gas as a carrier.
The continuous production system provided by the invention comprises a reaction furnace 8, wherein the reaction furnace 8 is provided with a plurality of feeding holes, a gas outlet and a slag discharging hole 16.
As a specific implementation of the present invention, the reaction furnace 8 is specifically a normal pressure closed electric furnace.
As a specific implementation of the present invention, the reaction furnace 8 is an ac electric arc furnace.
As an embodiment of the present invention, the reaction furnace 8 is a dc arc furnace.
In one embodiment of the present invention, the reaction furnace 8 is a dc furnace with a bottom electrode.
As a specific implementation of the invention, the reaction furnace 8 is a direct current furnace without a bottom electrode.
As a specific embodiment of the invention, the reaction furnace comprises a water-cooled furnace shell and a molten pool wrapped by the water-cooled furnace shell.
As a specific embodiment of the invention, the water-cooled furnace shell comprises a water-cooled furnace side wall, a water-cooled furnace cover and a water-cooled furnace bottom.
As a specific embodiment of the invention, a refractory lining is arranged between the water-cooled furnace shell and the molten bath.
As a specific embodiment of the invention, the material of the furnace lining is corundum-aluminum refractory material.
As a specific embodiment of the invention, the material of the furnace lining is made of magnesium refractory material.
As a specific embodiment of the invention, the material of the furnace lining is magnesia-alumina spinel refractory.
As a specific embodiment of the invention, the material of the furnace lining is graphite refractory material.
In one embodiment of the present invention, the material constituting the molten pool is a carbonaceous refractory material.
In the present invention, the reaction furnace 8 is preferably provided with an electrode 7, and the electrode 7 is preferably a graphite electrode.
As an embodiment of the present invention, the electrode 7 of the reaction furnace 8 is preferably a tubular electrode.
As an embodiment of the present invention, the tubular electrode 7 is a tubular graphite electrode.
As a specific embodiment of the present invention, the closed feeding pipe 6 is sleeved in the tubular electrode 7, and one end of the tubular electrode 7 extends into the reaction furnace 8.
In the present invention, the tubular electrode 7 is both a conductive path for conducting electric current into the reaction furnace 8 and a main feed line for feeding the raw material and the reducing agent into the furnace.
In one embodiment of the present invention, the lower end surface of the tubular electrode 7 is located above the surface of the molten pool in the reactor 8, and the tubular electrode 7 is energized to discharge electricity on the surface of the molten pool in the reactor 8 to form an arc and heat the molten pool.
As a specific implementation of the present invention, the tubular electrode 7 is a main feeding pipe of the reaction furnace 8, and the reaction furnace 8 is further provided with a plurality of auxiliary feeding pipes, and the auxiliary feeding pipes are used for separately feeding aluminum particles or a mixture of magnesium oxide powder and aluminum particles into the reaction furnace 8.
The continuous production system provided by the invention preferably further comprises a slag receiving container 17, wherein the slag receiving container 17 is used for receiving and transferring the byproducts of the smelting reduction discharged from the slag discharging port 16.
As a specific embodiment of the present invention, the slag receiving container 17 is a slag ladle.
As a specific embodiment of the present invention, the slag receiving container 17 is a slag pot.
The continuous production system provided by the invention preferably further comprises an electric network 19, wherein the electric network 19 is electrically connected with the power conversion device 21.
In the present invention, the grid 19 is used to supply power to the power conversion device 21.
The continuous production system provided by the invention preferably further comprises a power conversion device 21, wherein the power conversion device 21 is in contact connection with one end of the tubular electrode 7 outside the reaction furnace 8 through a short-net bus.
In the present invention, the power conversion device 21 transforms/transforms the electric energy transmitted from the power grid 19, and then transmits the electric energy to the tubular electrode 7 through the short grid bus 22, and arc discharge is formed between the end of one end of the tubular electrode 7 extending into the molten pool of the reactor 8 and the surface of the molten pool.
The continuous production system provided by the invention preferably further comprises a gas-liquid condensation separator 10, wherein the gas-liquid condensation separator 10 is provided with an inlet, a gas outlet and a liquid outlet, and the inlet of the gas-liquid condensation separator 10 is communicated with the gas outlet of the reaction furnace 8.
As a specific implementation of the present invention, a gas outlet is provided at the top of the gas-liquid condensation separator 10, and a liquid outlet is provided at the bottom of the side surface of the gas-liquid condensation separator 10.
As an embodiment of the present invention, the gas-liquid condensation separator 10 is in communication with the reaction furnace 8 through a magnesium vapor transfer pipe 9.
As an embodiment of the present invention, the magnesium vapor transfer pipe 9 is a heat-insulated closed magnesium vapor transfer pipe.
In the present invention, in the molten bath of the reaction furnace 8, magnesium oxide powder and aluminum particles are subjected to a melting reduction reaction to obtain magnesium vapor, and the magnesium vapor enters the magnesium vapor delivery pipe 9 from the gas outlet of the reaction furnace 8 under the condition that a flowing protective gas serves as a carrier, and is delivered to the gas-liquid condensation separator 10 through the magnesium vapor delivery pipe 9. In the gas-liquid condensation separator 10, the magnesium vapor is condensed into a liquid state to be separated from the carrier gas.
The continuous production system provided by the invention preferably further comprises a gas filtering device 12, wherein the inlet of the gas filtering device 12 is communicated with the gas outlet of the gas-liquid condensation separator 10, and the gas outlet of the gas filtering device 12 is communicated with the gas inlet of the gas storage container 14.
In the present invention, the protective gas separated from the liquid Mg in the gas-liquid condensation separator 10 enters the gas filtering device 12 from the gas outlet of the gas-liquid condensation separator 10 for purification.
As an embodiment of the present invention, the inlet of the gas filtering device 12 is disposed at the bottom of the gas filtering device 12.
The continuous production system provided by the present invention preferably further comprises an ingot casting machine 11. And a feeding port of the ingot casting machine 11 is communicated with a liquid outlet of the gas-liquid 2 condensation separator 10.
The ingot casting machine 11 as an embodiment of the present invention is installed in a closed space, and the space where the ingot casting machine is located is filled with a protective gas.
As a specific embodiment of the present invention, an ingot casting mold is disposed in the closed space where the ingot casting machine 11 is located.
As a specific embodiment of the present invention, the ingot mold is a rod-shaped grinding tool, and the ingot casting machine 11 obtains a magnesium rod product.
As a specific embodiment of the present invention, the ingot casting mold is an ingot mold, and the ingot casting machine 11 obtains a magnesium ingot.
The continuous production system provided by the invention preferably further comprises a magnesium purification refining device 18, a feeding port of the magnesium purification refining device 18 is communicated with a liquid outlet of the gas-liquid condensation separator 10, and a discharging port of the magnesium purification refining device 18 is communicated with a feeding port of the ingot casting machine 11.
In the present invention, the magnesium purification and refining device 18 is used for purifying and refining the liquid Mg obtained by the condensation to obtain refined Mg liquid.
The continuous production system provided by the invention preferably further comprises a gas compressor 13, wherein a gas inlet of the compressor is communicated with a gas outlet of the gas filtering device 12, and a gas outlet of the compressor 13 is communicated with a gas inlet of the gas storage container 14.
In the present invention, the gas compressor 13 is used for compressing the purified gas obtained from the gas outlet of the gas filtering device 12 and storing the compressed gas in the gas storage container 14.
The specific method for preparing the magnesium metal by using the continuous production system is preferably as follows: the magnesium oxide powder is discharged into the first raw material storage container 23, and the aluminum particles are discharged into the second raw material storage container 24. Starting the raw material and reducing agent conveyor 2, continuously discharging the magnesium oxide powder in the first raw material storage container into the raw material and reducing agent conveyor 2 through the first metering feeder 1, and continuously discharging the aluminum granules in the second raw material storage container into the raw material and reducing agent conveyor 2 through the second metering feeder 20; the raw material and reducing agent conveyer 2 continuously conveys magnesium oxide powder and aluminum particles into a mixing bin 3, the mixture in the mixing bin 3 is discharged into a gas feeding device through a third metering feeder 4, meanwhile, gas in a gas storage container 14 is introduced into a pneumatic feeding device 5 through a pressure regulating valve 15 to serve as a carrier, the mixture is conveyed into a molten pool of a reaction furnace 8 through a closed feeding pipeline 6, wherein the reaction furnace 8 is an electric furnace, the reaction furnace 8 is provided with a tubular electrode 7, the closed feeding pipeline is sleeved at one end of the tubular electrode 7, the tubular electrode 7 is electrically connected with a short network bus 22 in a contact manner, electric energy provided by a power grid 19 is subjected to pressure change/current change through an electric power exchange device 21 and is conveyed to the electrode 7 through the short network bus 22, and arc discharge is formed on the molten pool at the end of one end of the electrode 7 extending into the reaction furnace 8, so that the temperature of the molten pool of the reaction furnace 8 is maintained above 2200 ℃, melting magnesium oxide powder and aluminum particles to form liquid, carrying out reduction reaction to obtain magnesium vapor and residual melt after reaction, introducing the magnesium vapor into a gas-liquid condensation separator 10 together with protective gas, condensing the magnesium vapor in the gas-liquid condensation separator 10 to obtain liquid Mg, and directly introducing the liquid Mg into an ingot casting machine 11 for casting to obtain a magnesium rod or magnesium ingot product; or refining the liquid Mg by the refining device 18 and then casting the refined magnesium rod or the refined magnesium ingot in the ingot casting machine 11 to obtain the refined magnesium rod or the refined magnesium ingot product. After the residual melt after reaction in the reaction furnace 8 is accumulated to a certain amount, the residual melt is discharged into a slag receiving container 17 through a slag discharge port 16 of the reaction furnace and is conveyed to a slag treatment field for treatment. The gas separated by the gas-liquid condensation separator 10 enters a gas filtering device 12 for treatment, is compressed by a gas compressor 13 and then enters a gas storage container 14 for storage and recycling.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Discharging magnesium oxide powder with the grain diameter of less than or equal to 0.3mm and the MgO content of more than or equal to 95 wt% into a first raw material storage container 23, and discharging aluminum particles with the grain diameter of 1-5 mm and the Al content of more than or equal to 95 wt% into a second raw material storage container 24. Starting the raw material and reducing agent conveyor 2, continuously discharging the magnesium oxide powder in a first raw material storage container into the raw material and reducing agent conveyor 2 through a first metering feeder 1, continuously discharging the aluminum granules in a second raw material storage container into the raw material and reducing agent conveyor 2 through a second metering feeder 20, wherein the mass ratio of the aluminum granules to the magnesium oxide powder is 0.45: 1; the raw material and reducing agent conveyor 2 continuously conveys magnesium oxide powder and aluminum particles into a mixing bunker 3, the mixture in the mixing bunker 3 is discharged into a gas feeding device through a third metering feeder 4, meanwhile, gas in a carrier storage container 14 is introduced into a pneumatic feeding device 5 through a pressure regulating valve 15 to be used as a carrier, the mixture is conveyed into a molten pool of a reaction furnace 8 through a closed feeding pipeline 6, wherein the reaction furnace 8 is an electric furnace, the reaction furnace 8 is provided with an electrode 7 of a central pipeline, the closed feeding pipeline is sleeved with the electrode central pipeline of the central pipeline electrode 7, the central pipeline electrode 7 is in contact and electric connection with a short network bus 22, electric energy provided by an electric network 19 is subjected to pressure change/current change through an electric power exchange device 21 and is conveyed to the electrode 7 through the short network bus 22, and arc discharge is formed between the end of one end of the electrode 7 extending into the reaction furnace 8 and the molten pool, the molten pool of the reaction furnace 8 is heated to keep the molten state all the time in the production process, the magnesium oxide powder and the aluminum particles are molten into liquid, and the liquid is subjected to reduction reaction under the normal pressure condition to obtain magnesium vapor and molten corundum. The magnesium vapor enters a gas-liquid condensation separator 10 along with continuously introduced protective gas in a molten pool, the magnesium vapor is condensed in the gas-liquid condensation separator 10 to obtain liquid Mg, and the liquid Mg directly enters an ingot casting machine 11 for casting to obtain a magnesium rod or a magnesium ingot product; or refining the liquid Mg by the refining device 18 and then casting the refined Mg in the ingot casting machine 11 to obtain a refined magnesium rod or a refined magnesium ingot product. After the molten corundum in the reaction furnace 8 is accumulated to a certain amount, the molten corundum is discharged into a slag receiving container 17 through a slag discharge port 16 of the reaction furnace and is conveyed to a slag treatment field for treatment. The gas separated by the gas-liquid condensation separator 10 enters a gas filtering device 12 for treatment, is compressed by a gas compressor 13 and then enters a gas storage container 14 for storage and recycling.
Example 2
Discharging magnesium oxide powder with the grain diameter of less than or equal to 0.3mm and the MgO content of more than or equal to 95 wt% into a first raw material storage container 23, and discharging aluminum particles with the grain diameter of 1-5 mm and the Al content of more than or equal to 95 wt% into a second raw material storage container 24. And starting the raw material and reducing agent conveyor 2, continuously discharging the magnesium oxide powder in the first raw material storage container into the raw material and reducing agent conveyor 2 through the first metering feeder 1, continuously discharging the aluminum granules in the second raw material storage container into the raw material and reducing agent conveyor 2 through the second metering feeder 20, wherein the mass ratio of the aluminum granules to the magnesium oxide powder is 0.25: 1. The raw material and reducing agent conveyor 2 continuously conveys magnesium oxide powder and aluminum particles into the mixing bin 3, the mixture in the mixing bin 3 is discharged into the gas feeding device through the third metering feeder 4, meanwhile, gas in the carrier storage container 14 is introduced into the pneumatic feeding device 5 through the pressure regulating valve 15 to serve as a carrier, and the conveyed mixture is conveyed into a molten pool of the reaction furnace 8 through the closed feeding pipeline 6 and the central pipeline electrode 7. Wherein the reaction furnace 8 is an electric furnace, the reaction furnace 8 is provided with a central pipeline electrode 7, the closed feeding pipeline 6 is sleeved in the central pipeline of the electrode 7, the electrode 7 is in contact and electric connection with a short network bus 22, electric energy provided by a power grid 19 is transmitted to the electrode 7 through the short network bus 22 after being subjected to voltage transformation/current transformation through an electric power exchange device 21, the electrode 7 extends into a position between one end of the reaction furnace 8 and the surface of a molten pool to form arc discharge, the molten pool of the reaction furnace 8 is heated to be kept in a molten state all the time in the production process, magnesium oxide powder and aluminum particles are molten into liquid, reduction reaction is carried out under normal pressure to obtain magnesium vapor and molten magnesium aluminate spinel, the magnesium vapor enters a gas-liquid condensation separator 10 together with protective gas continuously introduced into the molten pool, the magnesium vapor is condensed in the gas-liquid condensation separator 10 to obtain liquid Mg, the liquid Mg directly enters an ingot casting machine 11 for casting, obtaining a magnesium rod or a magnesium ingot product; or refining the liquid Mg by the refining device 18 and then casting the refined Mg in the ingot casting machine 11 to obtain a refined magnesium rod or a refined magnesium ingot product. After the molten magnesium aluminate spinel in the reaction furnace 8 is accumulated to a certain amount, the molten magnesium aluminate spinel is discharged into a slag receiving container 17 through a slag discharge port 16 of the reaction furnace 8 and is conveyed to a slag treatment field for treatment. The gas separated by the gas-liquid condensation separator 10 enters a gas filtering device 12 for treatment, is compressed by a gas compressor 13 and then enters a gas storage container 14 for storage and recycling.
Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.
Claims (10)
1. A method for continuously producing magnesium metal, comprising the steps of:
continuously feeding magnesium oxide powder and aluminum particles in flowing protective gas, continuously melting in a closed electric furnace, and continuously carrying out reduction reaction to obtain magnesium vapor, wherein the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.6): 1.
2. The method as claimed in claim 1, wherein the particle size of the magnesium oxide powder is not more than 0.3mm, and the MgO content in the magnesium oxide powder is not less than 95 wt%.
3. The method according to claim 1, wherein the particle size of the aluminum particles is 0.3-10 mm, and the content of Al in the aluminum particles is not less than 95 wt%.
4. The method of claim 1, wherein the shielding gas is a pneumatically-fed carrier gas and the shielding gas is one or more of hydrogen, argon, and helium.
5. The method of claim 1, wherein the smelting reduction reaction also continuously produces a byproduct, which is corundum or magnesium aluminate spinel.
6. The method according to claim 5, wherein when the byproduct is corundum, the mass ratio of the aluminum particles to the magnesium oxide powder is (0.45-0.6): 1.
7. The method as claimed in claim 5, wherein when the byproduct is magnesium aluminate spinel, the mass ratio of the aluminum particles to the magnesium oxide powder is (0.25-0.45): 1.
8. A continuous production system for use in the continuous production of magnesium metal according to claim 1, comprising:
the reaction furnace (8) is a normal-pressure closed electric furnace, and the reaction furnace (8) is provided with a plurality of feed inlets, a gas outlet and a slag discharge port (16);
the discharge hole of the raw material and reducing agent conveyor (2) is communicated with the feed hole of the reaction furnace (8);
and the gas outlet of the gas storage container (14) is communicated with the feed inlet of the reaction furnace (8).
9. The continuous production system according to claim 8, further comprising a pneumatic feeding device (5), said pneumatic feeding device (5) being provided with a feed inlet, a gas inlet and a discharge outlet;
the feed inlet of the pneumatic feeding device (5) is communicated with the discharge outlet of the raw material and reducing agent conveyor (2);
a carrier gas inlet of the pneumatic feeding device (5) is communicated with a gas outlet of the gas storage container (14);
and the discharge hole of the pneumatic feeding device (5) is communicated with the feed inlet of the reaction furnace 8 through a closed feeding pipeline (6).
The carrier gas used by the pneumatic feeding device (5) is one or a mixture of hydrogen, argon and helium.
10. Continuous production system according to claim 9, wherein the reaction furnace (8) is provided with a tubular electrode (7); the closed feeding pipeline (6) is sleeved in the tubular electrode (7), and one end of the tubular electrode (7) extends into the reaction furnace (8). The tubular electrode 7 is both a current path for feeding electric energy into the reaction furnace 8 and one of the feed ports of the reaction furnace 8.
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| CN101812599A (en) * | 2010-03-18 | 2010-08-25 | 吉林大学 | Method for preparing metal magnesium by using dolomite as raw material |
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| CN111321310A (en) * | 2020-02-10 | 2020-06-23 | 中国恩菲工程技术有限公司 | Method and system for preparing magnesium metal |
| CN111748691A (en) * | 2019-03-28 | 2020-10-09 | 狄保法 | Aluminothermic magnesium smelting device and process |
| CN113789450A (en) * | 2021-08-27 | 2021-12-14 | 中国铝业股份有限公司 | Preparation method for producing magnesium metal through aluminothermic process |
| CN217351493U (en) * | 2022-03-07 | 2022-09-02 | 沈阳益富冶炼技术装备有限公司 | Continuous production system for producing magnesium metal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101812599A (en) * | 2010-03-18 | 2010-08-25 | 吉林大学 | Method for preparing metal magnesium by using dolomite as raw material |
| CN101985701A (en) * | 2010-11-11 | 2011-03-16 | 北京科技大学 | Method for reducing calcined magnesite by using calcium carbide under normal pressure |
| CN111748691A (en) * | 2019-03-28 | 2020-10-09 | 狄保法 | Aluminothermic magnesium smelting device and process |
| CN111321310A (en) * | 2020-02-10 | 2020-06-23 | 中国恩菲工程技术有限公司 | Method and system for preparing magnesium metal |
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