CN1053018C - Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process - Google Patents

Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process Download PDF

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Publication number
CN1053018C
CN1053018C CN95100495A CN95100495A CN1053018C CN 1053018 C CN1053018 C CN 1053018C CN 95100495 A CN95100495 A CN 95100495A CN 95100495 A CN95100495 A CN 95100495A CN 1053018 C CN1053018 C CN 1053018C
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magnesium
electric furnace
rhombspar
slag
insulating mat
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CN95100495A
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CN1131201A (en
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孙克本
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孙克本
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Abstract

The present invention relates to a new electric stove magnesium smelting method and a device thereof. The present invention is characterized in that dolomite, bauxite and silicon iron are used as raw materials; the dolomite, the bauxite and the silicon iron which are calcined with temperature more than 700 DEG C are put into an electric stove, and the magnesium is refined by silicothermic reduction in vacuum. The electric stove adopts a novel structure which can assure complete sealing, and an electrode can freely and vertically move. The method has the advantages of energy saving, water saving, low energy consumption, no pollution and wide raw material source, productivity ratio of the method is greatly increased than that of the prior art, and the cost of the method is only 2/3 of that of the prior art.

Description

Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process
The present invention relates to a kind of electric furnace refining magnesium novel process and realize the equipment of this method, specifically this method new device of having adopted electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process and having finished this technology.
At present at home, process for smelting magnesium still prolongs the magnesite chlorination electrolytic process technology with Soviet Union's sixties, its complex technical process, and need huge subsystems such as chlorine circulation, and equipment is huge, the power consumption height, and the total power consumption of pure magnesium per ton is at 25000Kwh; The production cost costliness, raw material is single, and environmental pollution is serious.
The object of the present invention is to provide that a kind of raw material sources are extensive, energy-conservation, productive rate is high, make environmental pollution as far as possible little, the refining magnesium novel process that cost is low.
Another object of the present invention is to provide a kind of above-mentioned novel process equipment used.
Refining magnesium novel method of the present invention is characterized in that adopting electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process, and this technology is undertaken by following step successively;
(1) with bauxite raw material, rhombspar crushing and screening respectively goes out the granular substance of 3-30 millimeter, mixing; With the ferrosilicon fragmentation, sieve out the granular substance of 2-20 millimeter again, place separately, stand-by;
(2) according to added rhombspar, bauxitic clay, formed slag, wherein CaO: SiO behind the ferrosilicon refining magnesium 2=1.7-1.8; Al 2O 3: SiO 2=0.26-0.28 (by molecular ratio) batching;
(3) by above-mentioned proportion scale rhombspar and bauxitic clay are added in the rotary kiln, are warming up to 1000-1080 ℃ of calcining, make:
(4) with above-mentioned calcining intact contain MgO at 700 ℃ more than-950 ℃, the rhombspar of CaO, bauxitic clay compound and ferrosilicon saccharoid join in the electric furnace through the insulation loading hopper;
(5) after the raw material hot charging is gone into electric furnace, close the electric furnace charging mouth, slag notch etc. are evacuated to 10 -2Handkerchief makes After stop;
(6) above-mentioned magnesium vapor condensation is become the liquid crude magnesium, be refined into smart magnesium again, cast magnesium ingot;
(7) from electric furnace, discharge slag, send into the slag treatment operation.Continue next refining magnesium circulation again.
Described rhombspar grade should be a rhombspar after calcining, and wherein (weight) contains magnesium oxide 20-22%, contains calcium oxide 30-33%, the alkali metal containing oxide compound (0.01%, contain silicon-dioxide 0.08-1.8%, loss in weight (carbonaceous gas and impurity thereof) 46-47.5%,
Described bauxite ore trioxygen-containingization two aluminium>60%;
Described ferrosilicon is siliceous>and 75%;
Described bauxitic clay, dolomite calcination after heat loading temperature is at 900-950 ℃.
The present invention realizes that the device of aforesaid method comprises raw material choice crushing and screening device, rhombspar and aluminium vanadine rotary kiln heating and calcining device, silicon reduction vacuum refining magnesium electric furnace and crude magnesium refrigerating unit, crude magnesium refining ingot casting device, slag processing apparatus is characterized in that described molten charge silicon reduction vacuum refining magnesium electric furnace has one electrode is slided freely and guarantee that vacuum tightness is 10 in the electric furnace -2The reliable electrode hole tightness system (2-7) of handkerchief;
Refining magnesium novel process of the present invention and device thereof have overcome the shortcoming of magnesite chlorination electrolytic process, owing to adopted measures such as hot charging charging, silicon controlled rectifier direct current supply, power consumption drops to 9000Kwh/ smart magnesium per ton by electrolytic process 25000Kwh/ smart magnesium per ton; Power consumption reduces by 60%, and production efficiency has improved 30% to be made it cost and reduce by 30%, drops to 15000 yuan of/ton magnesium by 22000 yuan of/ton magnesium of chlorination electrolytic process; And overcome of the pollution of the serious harmful poison gas of chlorination electrolytic process to environment; Saved initial cost; Shortened the capital construction cycle;
Following; by accompanying drawing process for smelting magnesium of the present invention and device are further described; obviously; can carry out various improvement and variation to it according to the solution of the present invention; but above-mentioned improvement and variation all should be considered as among the spirit and scope of the present invention, and the protection domain of technology of the present invention and device is limited to the appended claims.
Fig. 1 is that electric furnace molten charge silicon reduction vacuum process for smelting magnesium is arranged general flow chart;
Fig. 2 is a molten charge silicon reduction vacuum refining magnesium electric cooker structure sketch;
Fig. 3 is a molten charge silicon reduction vacuum refining magnesium electric furnace electrode tightness system view;
Fig. 4 is an electric furnace silicon reduction vacuum process for smelting magnesium schema.
Be summarized as follows referring to Fig. 1
The raw material rhombspar, the aluminium vanadine is ground into the granular substance of 3-30 millimeter through crusher 1, after sieve apparatus 2 screenings, sends into calcining furnace 3 by the ingredient proportion batching, heats up to 1000-1080 ℃ of calcining, makes
With above-mentioned calcining intact at the MgO that contains more than 700 ℃, the rhombspar of CaO and bauxitic clay are incubated batch can (4) through hot charging and send into immediately in the electric furnace (5);
The raw material ferrosilicon is also sent in the electric furnace 5 after crusher is ground into the particulate state screening dedust of 2-20 millimeter by ingredient proportion; The raw material hot charging is gone into electric furnace (5) rear enclosed charging opening, and cinder notch is got magnesium mouth etc., starts vacuum unit (8), suction to 10 -2Below the handkerchief, electric furnace begins to send electric smelting simultaneously, and temperature is elevated to 1480-1530 ℃, makes
Reducing metal magnesium greatly in 60-80 minute smelting reduction finish.
After finishing, reaction at first puts down heat-resisting lock gate hatch (2-13); stop power supply; vacuum unit (8) is shut down, and the 1350-1400 that electric reduction furnace is come ℃ magnesium steam is cooled in condenser (2-16) and is transformed into liquid magnesium after 760-800 ℃ and drops in the storage magnesium jar (2-17) of below.Crude magnesium liquid is admitted to refining furnace (11), and heat temperature raising adds insulating covering agent routinely, about 10~15 minutes of refining agent refining, and the ingot casting of coming out of the stove, the magnesium shallow lake is cleaned plated film and is got final product commodity selling.
After stopping melting, open slag-drip opening (2-3) slagging of electric furnace (5), slag can be as the raw material of goods such as preparation cement after the shrend of slag pond (15).
Be noted that slagging can not put only, stay the slag of 150-220 mm thick to help circulating sending next time and establish stove by cable, its reason is the scheme according to electric furnace of the present invention refining magnesium, and electric furnace is not to adopt big electric arc formation temperature field but adopt the resistance heating formation temperature field of ore electrical conductivity of molten slag to reach the purpose of smelting reduction magnesium.Thereby further saved the energy.
Above-mentioned crude magnesium connects away, slags tap to begin the circulation of melting next time after finishing.
In condenser (2-16), the residual exhaust after the crude magnesium condensation is discharged by the top, through chiller (2-14) cooling, reduces to below 40 ℃ by behind the electric precipitator by about 700 ℃, and the tail gas that does not contain grit is discharged by the vacuum machine.
Fig. 2 illustrates the electric cooker structure sketch by the present invention program, described electric furnace has one by flat, the body of heater (2-20) that heat-resisting furnace lining is arranged in spherical cap and the cylinder composition, in upper of furnace body, the guaranteed vacuum-sealing charging opening (2-9) that at high temperature reaches fast and flexible in bottom, slag-drip opening (2-3), with go out the magnesium mouth, and the snubber (2-11) that leads to the magnesium steam exhaust channel of condensing chamber (2-16), be provided with at body of heater central axis place and pass electrode assemblie and the electrode sealing (2-7) that the body of heater top cover slidably is made up of Graphite Electrodes (2-5) and long copper pipe water cooled electrode (2-6), hoisting appliance with connection electrode, safety valve (2-12) is arranged at the top of snubber, a heat-resisting slide valve (2-13) is arranged on snubber (2-11) and leads on the passage of condensing chamber (2-16), the condensing chamber lower space is a storage magnesium jar (2-17), from the cold that cold-trap (2-15) width of cloth of condensing chamber sidepiece is penetrated, be crude magnesium liquid with the magnesium steam cooling, remaining tail gas is discharged from the condensing chamber top and is entered chiller (2-14).
The technical characterictic of molten charge silicon reduction vacuum of the present invention refining magnesium electric furnace is to adopt novelly, and can the guaranteeing that electrode is free to slide and can strict seal make of original creation keeps vacuum tightness 10 in the electric furnace -2The sealed structure of handkerchief is seen Fig. 3; Electrode sealing (7) is arranged on the top cover place of passing body of heater (2-20) with the co-axial water-cooled copper electrode of body of heater (2-20) (3-2), be provided with silico-aluminate mineral wool muff (3-4) from bottom to top in the annular space between the steel electrode hole water jacket (3-5) that water-cooled copper electrode (3-2) links to each other with top cover, following insulating mat (3-6), be arranged alternately layer flexible graphite-seal ring (3-8), mica dividing plate (3-9), coupled rubber insulation sleeve (3-7) is arranged outside the soft graphite wear ring, which is provided with insulating mat (3-12), pass through securing bolt, nut (3-11), rubber gasket (3-10), upper strata hermetically sealed case (3-14) compresses the filler in the above-mentioned bottom water jacket, in the annular space of water-cooled copper electrode (3-2) and upper strata hermetically sealed case (3-14), be provided with insulating mat (3-13) down from bottom to top, be arranged alternately multilayer rubber packing (3-15) and dottle pin (3-16), and last insulating mat (3-19), by the upper strata securing bolt, nut (3-18), last laminated cover (3-17) compress the upper strata filler and realize sealing reliably under freely the situation to guarantee that electrode moves up and down.
Above-mentioned following insulating mat (3-6), last insulating mat (3-12), following insulating mat (3-13), dottle pin (3-16), the material of last insulating mat (3-19) etc. is a mica.

Claims (6)

1. electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process comprises:
(1) with bauxite raw material, rhombspar is broken respectively, sieves out the granular substance of 3-30 millimeter, and mixing again with the ferrosilicon fragmentation, sieves out the granular substance of 2-20 millimeter, places stand-by separately;
(2) according to added rhombspar, bauxitic clay, formed slag, wherein CaO: SiO behind the ferrosilicon refining magnesium 2=1.7-1.8; Al 2O 3: SiO 2=0.26-0.28 (by molecular ratio) batching;
(3) rhombspar and the bauxitic clay that will contain MgO, CaO by above-mentioned proportion scale joins in the rotary kiln, is warming up to 1000-1080 ℃ of calcining and makes:
It is characterized in that with above-mentioned calcining intact at 700 ℃-950 ℃ rhombspar, bauxitic clay compound and ferrosilicon saccharoid are refined through red immediately the sending in the electric furnace of insulation loading hopper;
After the raw material hot charging is gone into electric furnace, close the electric furnace charging mouth, slag notch etc. are evacuated to 10 -2Handkerchief send electric smelting, and temperature reaches 1480-1530 ℃, makes Refined 60-80 minute, reduction finishes, and stops melting;
Above-mentioned magnesium vapor condensation is become the liquid crude magnesium, be refined into smart magnesium again, cast magnesium ingot;
From electric furnace, discharge slag, send into the slag treatment operation;
Continue next refining magnesium circulation again.
2. press the method for claim 1, it is characterized in that raw material rhombspar grade should satisfy after it is calcined, wherein (weight) contains magnesium oxide 20-22%, contain calcium oxide 30-33%, alkali metal containing oxide compound<0.01%, contain silicon-dioxide 0.08-1.8%, bodies lost weight (carbonaceous gas and impurity 46-47.5% thereof
Described bauxite ore trioxygen-containingization two aluminium>60%;
Described ferrosilicon is siliceous>and 75%.
3. press the method for claim 1 or 2, described rhombspar, the molten charge temperature of aluminium vanadine after calcining is at 900-950 ℃.
4. press the method for claim 1 or 2, it is characterized in that realizing adopting the resistance heating formation temperature field of ore electrical conductivity of molten slag with smelting reduction magnesium in order more to help, not exclusively drain during deslagging at a melting end-of-cycle, keep a part of slag and be beneficial to circulate send next time and establish stove by cable by electric furnace.
5. one kind as electric furnace reduction vacuum refining magnesium novel process equipment used as described in the claim 1-4, comprise raw material choice crushing and screening device, rhombspar and bauxitic clay rotary kiln heating and calcining and crude magnesium refrigerating unit, smart magnesium refining ingot casting device, slag processing apparatus is characterized in that described molten charge silicon reduction vacuum refining magnesium electric furnace has an electrode hole tightness system that electrode is slided freely and guarantee vacuum tightness in the electric furnace;
Described electrode hole tightness system (2-7) is arranged on the top cover place of passing body of heater (2-20) with the co-axial water-cooled copper electrode of body of heater (2-20) (3-2), the bottom-up silico-aluminate mineral wool muff (3-4) that is provided with in the annular space between the steel electrode hole water jacket (3-5) that water-cooled copper electrode (3-2) links to each other with top cover, following insulating mat (3-6), be arranged alternately black wear ring (3-8) of layer flexible stone and mica dividing plate (3-9), coupled rubber insulation sleeve (3-7) is arranged outside the soft graphite wear ring, which is provided with insulating mat (3-12), pass through securing bolt, nut (3-11) rubber gasket (3-10), upper strata hermetically sealed case (3-14) compresses the filler in the above-mentioned bottom water jacket, in the annular space of water-cooled copper electrode (3-2) and upper strata hermetically sealed case (3-14), be provided with insulating mat (3-13) down from bottom to top, be arranged alternately multilayer rubber packing (3-15) and dottle pin (3-16), last insulating mat (3-19), by the upper strata securing bolt, nut (3-18) is gone up laminated cover (3-17), compresses the upper strata filler and realizes sealing reliably to guarantee that electrode moves up and down under freely the situation;
Wherein, be electrically insulating material with water-cooled copper electrode parts in contact material.
6. according to the device of claim 5, it is characterized in that described and the following insulating mat of water-cooled copper electrode parts in contact (3-6), last insulating mat (3-12), following insulating mat (3-13), dottle pin (3-16), the material of last insulating mat (3-19) is a mica.
CN95100495A 1995-03-15 1995-03-15 Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process Expired - Fee Related CN1053018C (en)

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CN95100495A CN1053018C (en) 1995-03-15 1995-03-15 Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process

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CN95100495A CN1053018C (en) 1995-03-15 1995-03-15 Electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process

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CN1053018C true CN1053018C (en) 2000-05-31

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101676419B (en) * 2008-05-13 2011-06-15 辛卫亚 Semi-continuous production metal vacuum smelting reduction device
CN101999005B (en) * 2010-06-07 2013-01-02 牛强 Vacuum circulation molten state silicothermic method for producing magnesium and equipment thereof
CN102534251A (en) * 2012-03-07 2012-07-04 关树翔 Yield and efficiency increasing method for smelting rough metal magnesium by Pidgeon process
CN104245974A (en) * 2012-04-27 2014-12-24 姜远燮 Method for preparing ferro-silicon and magnesium using ferro-nickel slag, preparation apparatus used therefor, and smelting reduction furnace
CN104152720B (en) * 2014-06-23 2017-04-05 石家庄新华能源环保科技股份有限公司 A kind of method and apparatus of electrical heating reducing metal magnesium and by-product cement grog

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478637A (en) * 1983-03-10 1984-10-23 Aluminum Company Of America Thermal reduction process for production of magnesium
US4518425A (en) * 1983-12-20 1985-05-21 University Of Waterloo Production of magnesium metal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478637A (en) * 1983-03-10 1984-10-23 Aluminum Company Of America Thermal reduction process for production of magnesium
US4518425A (en) * 1983-12-20 1985-05-21 University Of Waterloo Production of magnesium metal

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Assignee: Erdos Electric Power Metallurgy Co Ltd

Assignor: Sun Keben

Contract fulfillment period: The period of performance of the contract is 2004-04-15 to the contract period

Contract record no.: Contract filing No. 041000030042

Denomination of invention: New process for hot reduction of vacuum furnace by vacuum reduction of magnesium alloy by hot charging

Granted publication date: 20000531

License type: Exclusive license

Record date: 20040526

LIC Patent licence contract for exploitation submitted for record

Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT:2004-04-15 TO CONTRACT

Name of requester: EERDUOSI POWER METALLURGY CO., LTD.

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