CN105420516A - Novel process for continuously smelting magnesium metal with electric furnace - Google Patents
Novel process for continuously smelting magnesium metal with electric furnace Download PDFInfo
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- CN105420516A CN105420516A CN201510749995.6A CN201510749995A CN105420516A CN 105420516 A CN105420516 A CN 105420516A CN 201510749995 A CN201510749995 A CN 201510749995A CN 105420516 A CN105420516 A CN 105420516A
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Abstract
The invention relates to a novel process for continuously smelting magnesium metal with an electric furnace. The novel process is characterized by comprising the following steps: feeding with a calcination rotary kiln, receiving materials and discharging with an insulated material tank, quantitatively sealed feeding, and smelting with the electric furnace; reducing magnesium vapor at 1550-1600 DEG C, wherein magnesium cooled by a magnesium vapor crystallizer is liquid magnesium; sucking and pouring the liquid magnesium to a magnesium receiving pot by using a vacuum suction pouring pump, and transporting the liquid magnesium in the magnesium receiving pot to a refining workshop for refining by using a battery cart; deslagging by using a forehearth which is positioned in front of the electric furnace and communicated with the electric furnace, and thus ensuring continuous deslagging in vacuum. According to the novel process, the whole production process can realize mechanization, and the main production part realizes automation control; in the whole production process, materials do not fall to the ground, the human consumption is reduced, the production efficiency is improved, powder pollution can be thoroughly removed, and the environment is improved. 7150 kilowatts are consumed per ton of magnesium, and the power consumption per ton of magnesium is reduced by 40 percent compared with the current French and American Malina method. Compared with the Pidgeon process, CO2 and SO2 emission can be reduced by 80 percent. The production efficiency is improved by 25 percent, the energy consumption is reduced by 50 percent, and the production cost is reduced by 30 percent.
Description
Technical field
The invention belongs to magnesium metal smelting field, the concrete method adopting electric furnace microwave heating smelting magnesium.
Background technology
Current in man of China and produce magnesium metal smelting technique in the world and mainly contain Pidgeon process, semicontinuous (i.e. mug(unit of measure) Ni Nafa), chlorination electrolytic process.Wherein, because chlorination electrolytic process ton magnesium power consumption is up to about 20,000 degree, high cost, thus lose the market competitiveness and be eliminated.Next is the production of magnesium by pidgeonprocess technique that China adopts, this technological process is numerous and diverse, (namely material calcining, be again cooled to normal temperature, abrasive dust (150 ~ 200 order fine powder), again through batching, large-sized ball press pressure ball, reinstall in high-chromium-nickel steel matter reductive jar, external heat carries out reduction 10 ~ 12 hours to 1200 DEG C.Artificial high temperature is reinforced, discharging, and owing to being external heat, heat energy loss is comparatively large, and heat utilization efficiency only has about 50%, and energy consumption is very high.Dust pollution is serious in addition, and major part is manual operation, and labour intensity is high, and mechanization degree is low, and single stove production capacity is low, production cost high (about 1.4 ten thousand yuan/ton of magnesium), and price only has 1.32 ten thousand yuan/ton of magnesium.
The patent No. is 200810232855.1 disclosed " technique of smelting magnesium by microwave heating Pidgeon process " technology, in this technique, need the rhombspar after by calcining through overcooling, abrasive dust, shaping after just can add in electric furnace and smelt.Seriously polluted in smelting process, thermo-efficiency is low, and labour intensity is large.
The patent No. is " electric furnace hot charge siliconthermic reduction vacuum magnesium-smelting new process " disclosed in 95100495.6 technology, and a whole set of smelting procedure of this technology discontinuously draws magnesium, and need blowing out when namely changing electrode, reduction magnesium is solid-state.
Most of manufacturer of current China produces due to Smelting magnesium and sustains losses in business, and has to stop production.France is relative with the semicontinuous electric furnace synthesis by internal resistance electric melting process for smelting magnesium that the U.S. adopts is more advanced production technique, single stove production capacity is high, mechanization degree is high, dust and obnoxious flavour pollute few, the blowing out that will be interrupted when replacing electrode slags tap magnesium, so be semi-continuous process, instead of complete continuous prodution.
Summary of the invention
For a change China's magnesium metal smelting industry generally adopt highly energy-consuming, high pollution, high cost, automatic and mechanical degree is low, labour intensity is high backward production technique (i.e. Pidgeon process), the invention provides the new process of the equal continuous processing electrosmelting MAGNESIUM METAL of not blowing out of all smelting procedures.
Technical scheme of the present invention:
The new process of continuous processing electrosmelting MAGNESIUM METAL, it is characterized in that being fed to from belt material-feeding machine connecing a whole set of Steelmaking not blowing out vacuum that magnesium pot goes out magnesium and carrying out continuously, the magnesium that crystallizer cools out is liquid magnesium, and worm conveyor slag tap link, the knot magnesium pot of link, forehearth that feed in raw material goes out not vacuum breaker and the not blowing out of magnesium link.
Described a whole set of Steelmaking comprises that belt material-feeding machine is reinforced, calcining, the charging of insulation batch can, worm conveyor are reinforced, smelt, forehearth is slagged tap, crystallizer cools, tie magnesium pot goes out magnesium, connects magnesium pot and go out magnesium process procedure.
Calcining adopts calcined by rotary kiln, and calcined by rotary kiln rhombspar drop temperature is 900 DEG C, particle diameter is 10 ~ 20mm; Smelt and adopt electric furnace vacuum metling, electric furnace vacuum metling temperature is 1550 ~ 1600 DEG C;
Belt material-feeding machine adopts high angle belt conveyer transfer roller.
The processing unit of continuous processing electrosmelting MAGNESIUM METAL comprises furnace charge high angle belt conveyer transfer roller, material preheater, rotary kiln, moving thermal insulation batch can, fixing insulation batch can, worm conveyor, microwave heating electric furnace, crystallizer, knot magnesium pot, vacuum suction pump, connects magnesium pot.
Material preheater connects rotary kiln, and the delivery port of rotary kiln connects moving thermal insulation batch can; Moving thermal insulation batch can is connected and fixed insulation batch can by valve; Be worm conveyor below fixing insulation batch can, worm conveyor connects microwave electric furnace; Microwave electric furnace connects crystallizer, crystallizer johning knot magnesium pot;
Tie magnesium pot and connect between magnesium pot and vacuum suction pump is set;
The processing unit of continuous processing electrosmelting MAGNESIUM METAL is also equipped with potassium sodium separator, fly-ash separator, water ring vacuum pump; Potassium sodium separator connects fly-ash separator, and fly-ash separator connects water ring vacuum pump.
Beneficial effect of the present invention:
1, adopt calcined dolomite out forge white temperatures as high about 900 DEG C, prior art is all proceed to next process after cooling, can not continuous seepage; The present invention adopts double-deck feed pot to reach Continuous Heat charging, can save the heat energy of about 30%, improves serialization automatic production degree, ensures consecutive production.
2, the MAGNESIUM METAL restored under the high temperature of 1550 DEG C ~ 1600 DEG C, by furnace roof passageway, is formed liquid magnesium and is down in knot magnesium pot, be retracted to and connect in magnesium pot, be transported to refining plant refining magnesium ingot by motor-mount pump under crystallizer.
3, the crude magnesium liquid tying magnesium pot is transported to refining plant and is poured in vacuum refinement electric furnace and adopt vacuum distilling refining magnesium ingot, produces the one-level magnesium of 99.95%.Whole process can realize mechanize and main production part realizes Automated condtrol, and all round process material does not land, and reduces manpower consumption, improves production efficiency, thoroughly can remove dust pollution, environmental protect.
4, adopt microwave to power electrosmelting, carry out silicon reduction under vacuum condition and produce MAGNESIUM METAL; Owing to adopting microwave power supply mode, eliminate and change electrode operation, avoid and change time and the interruption production that electrode causes blowing out, save a large amount of graphite electrode consumption simultaneously, reduce costs, the continuous prodution being conducive to electric furnace further increases production efficiency.
In sum, production cost of the present invention is no more than 10,000 yuan of yuan/ton of magnesium; And the minimum unit of current production of magnesium by pidgeonprocess cost is 13500 yuan/ton of magnesium, so the present invention has higher market viability and the market competitiveness.
Accompanying drawing explanation
Fig. 1 is tooling schematic diagram of the present invention.
Fig. 2 is process flow sheet of the present invention.
In figure, 1, belt material-feeding machine, 2, preheater, 3, rotary kiln, 4, moving thermal insulation batch can, 5, ferrosilicon feeding system, 6, rectifier transformer, 7, microwave treater, 8, potassium sodium separator, 9, ferrosilicon tank material, 10, fly-ash separator, 11, water ring vacuum pump, 12, electric flatcar, 13, connect magnesium pot, 14, vacuum suction pump, 15, magnesium pot is tied, 16, microwave electric furnace, 17, slagging forehearth, 18, worm conveyor, 19, fixing insulation batch can, 20, heat-resisting flashboard valve.
Embodiment
Shown in Fig. 1, the processing unit of continuous processing smelting magnesium comprises material preheater 2, rotary kiln 3, moving thermal insulation batch can 4, fixing insulation batch can 19, worm conveyor 18, microwave electric furnace 16, crystallizer, knot magnesium pot 13, vacuum suction pump 14, connects magnesium pot 15; Moving thermal insulation batch can 4 is connected by heat-resisting flashboard valve 20 with fixing insulation between batch can 19; Fixing insulation batch can 19 arranges worm conveyor 18 below, and worm conveyor 18 connects microwave electric furnace 16, and microwave electric furnace 16 is connected with crystallizer by furnace roof passageway, and connect potassium sodium separator 8 above crystallizer, potassium sodium separator 8 connects fly-ash separator 10; Johning knot magnesium pot 13 below crystallizer, arranges below knot magnesium pot 13 and connects magnesium pot 15, connect magnesium pot 15 and be arranged on electric flatcar 12.
Preheater 2 is the affiliated facility of rotary kiln 3;
One side of microwave electric furnace 16 connects slagging forehearth 17 by passageway; Described slagging forehearth 17 inner chamber has a block wall, and slagging forehearth 17 is separated out two slag chambeies by partition wall; The height of partition wall is higher than the outlet in passageway.Have living space between furnace roof before partition wall and slagging, this space is used for liquid slag and flows into another slag chamber from a slag chamber.The effect of partition wall makes to enter the liquid slag slag position of slagging forehearth 17 higher than the slag notch of microwave electric furnace 16, prevents vacuum breaker.
Art production process of the present invention:
Described a whole set of smelting procedure comprises the steps:
(1), raw material (rhombspar and bauxitic clay) conveniently proportioning carried by belt material-feeding machine and enter in rotary kiln through preheater; The particle diameter of rhombspar is 10 ~ 25mm; The particle diameter of bauxitic clay is 5 ~ 20mm;
(2), raw material after calcined by rotary kiln, the calcining temperature of rhombspar is 1280 ~ 1300 DEG C, and the drop temperature of calcined dolomite is 850 ~ 900 DEG C, particle diameter is 10 ~ 20mm; Calcined dolomite (abbreviation is forged white) enters a moving thermal insulation batch can; Meanwhile, ferrosilicon material is placed in another moving thermal insulation batch can by ferrosilicon feeding system;
(3), respectively by be equipped with the white moving thermal insulation batch can of forging be arranged on fixing insulation batch can above and with the moving thermal insulation batch can that the flange that is tightly connected is connected with valve, ferrosilicon is housed be arranged on fixing insulation batch can above and be connected with heat-resisting flashboard valve with the flange that is tightly connected;
(4) open two valves and the charging in two moving thermal insulation batch cans is entered screw feeder respectively through two fixing insulation batch cans;
(5), by 850 ~ 900 DEG C forge, white and ferrosilicon is transported in microwave electric furnace screw feeder, the white temperature of forging entering microwave electric furnace is 500 ~ 600 DEG C, forge white and ferrosilicon through the vacuum metling of 1550 ~ 1600 DEG C in microwave electric furnace, by restoring magnesium steam under silicothermic process vacuum state; The microwave frequency of microwave electric furnace is 1000 ~ 2500 megahertzes, by restoring magnesium steam under silicothermic process vacuum state; The silicon reduction reaction formula smelted in microwave electric furnace under vacuum state is
;
Magnesium steam enters in crystallizer by furnace roof passageway; Continuous charging not blowing out, not vacuum breaker;
(6), magnesium steam is cooled to liquid magnesium in a crystallizer and enters knot magnesium pot; The liquid magnesium of knot magnesium pot sucks to be placed on by vacuum suction pump and electric flatcar connects in magnesium pot; Go out magnesium not blowing out, not vacuum breaker;
Meanwhile, tail gas is by vacuum pump suction potassium sodium separator, and potassium sodium separator is by sodium and potassium crystallization in inner core, and the tail gas of band dust enters fly-ash separator; Most of dust is stayed in fly-ash separator by fly-ash separator, and the tail gas of regularly discharging is extracted out through water ring vacuum pump again;
(7) liquid magnesium, connect in magnesium pot is transported to refining plant by electric flatcar.
(8), liquid slag enters forehearth through passageway; By the slag potential difference produced between electric furnace and forehearth passageway, reach sealing in stove, vacuum breaker is not slagged tap continuously, not blowing out of slagging tap.
From raw material calcined by rotary kiln, insulation batch can high temperature continuous charging, electric furnace microwave heating, the present invention smelts that knot magnesium pot liquid state goes out magnesium continuously, to cross material be the omnidistance consecutive production do not landed to refining ingot casting production technique.
Insulation batch can is upper and lower double-deck batch can (i.e. moving thermal insulation batch can and fixing insulation batch can), moving thermal insulation batch can and fixing insulation batch can is middle valve, and tank not blowing out of accomplishing to reload ensures not blowing out continuous seepage; Slag tap and adopt the way of the vacuum-sealing forehearth be connected with electric furnace to slag tap continuously, ensure not blowing out continuous seepage.
The present invention is in high temperature reduction MAGNESIUM METAL, and the reduction ratio of magnesium is comparatively thorough, and in residue, the content of MgO is just lower, so just can use as the grog in manufacture of cement.High temperature furnace slag is liquid, so equally can carry out Water Quenching by the grain slag in image height stove, turns waste into wealth, for cement mill, thorough solution slag is to the pollution problem of environment, and ton magnesium reclaims slag 6 tons and calculates 20 yuan per ton simultaneously, and ton magnesium cost can reduce about 120 yuan.
The present invention can be significantly energy-conservation: ton magnesium power consumption 7150 degree, than the horse profit nanofarad ton magnesium power consumption 11500 degree of the current state-of-the-art French U.S. in the world, reduces 40%.The present invention is CO compared with Pidgeon process
2, SO
2discharge can reduce by 80%; Enhance productivity 25%, reduce energy consumption 50%, reduce production cost 30%, as can be seen here, the present invention has good economic benefit and social benefit.
Claims (3)
1. the new process of continuous processing electrosmelting MAGNESIUM METAL, it is characterized in that being fed to from belt material-feeding machine that to connect a whole set of Steelmaking that magnesium pot goes out magnesium be that not blowing out is carried out continuously, the magnesium that crystallizer cools out is liquid magnesium, and worm conveyor slag tap link, the knot magnesium pot of link, forehearth that feed in raw material goes out magnesium link all not vacuum breakers.
2. the new process of continuous processing electrosmelting MAGNESIUM METAL according to claim 1, is characterized in that described a whole set of Steelmaking comprises that belt material-feeding machine is reinforced, calcined by rotary kiln, the charging of insulation batch can, worm conveyor is reinforced, microwave electrosmelting, forehearth are slagged tap, crystallizer cools, tie magnesium pot goes out magnesium, connects magnesium pot and go out magnesium process procedure.
3. the new process of continuous processing electrosmelting MAGNESIUM METAL according to claim 1 or 2, is characterized in that described a whole set of smelting technology comprises the steps:
(1), raw material conveniently proportioning carried by belt material-feeding machine and enter in rotary kiln through preheater;
(2), raw material through calcined by rotary kiln, calcined dolomite temperature is 1280 ~ 1300 DEG C, and the drop temperature of calcined dolomite is 850 ~ 900 DEG C, particle diameter is 10 ~ 20mm; Calcined dolomite enters a moving thermal insulation batch can; Meanwhile, ferrosilicon material is placed in another moving thermal insulation batch can by ferrosilicon feeding system;
(3), open two valves and the batching in two moving thermal insulation batch cans is entered screw feeder through fixing insulation batch can;
(4), batching is transported to the microwave electric furnace with microwave heating by screw feeder, the microwave frequency of microwave electric furnace is 1000 ~ 2500 megahertzes, prepare burden through the vacuum metling of 1550 ~ 1600 DEG C in electric furnace, by restoring magnesium steam under silicothermic process vacuum state; Magnesium steam enters in crystallizer by furnace roof passageway; The silicon reduction reaction formula smelted in microwave electric furnace under vacuum state is
；
(5), magnesium steam is cooled to liquid magnesium in a crystallizer and enters knot magnesium pot; Liquid magnesium in knot magnesium pot sucks to be placed on by vacuum suction pump and electric flatcar connects in magnesium pot, and vacuum state goes out magnesium not blowing out; Meanwhile, tail gas is by vacuum pump suction potassium sodium separator, and potassium sodium separator is by sodium and potassium crystallization in the inner core of potassium sodium separator, and the tail gas of band dust enters fly-ash separator; Most of dust is stayed in fly-ash separator by fly-ash separator, and the tail gas of regularly discharging is extracted out through water ring vacuum pump again;
(6) liquid magnesium, connect in magnesium pot is transported to refining plant by electric flatcar and carries out refining ingot casting;
(7), liquid slag enters forehearth through passageway; By the slag potential difference produced between microwave electric furnace and forehearth passageway, reach sealing in stove, vacuum breaker is not slagged tap continuously.
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| CN201510749995.6A CN105420516B (en) | 2015-11-09 | 2015-11-09 | The new process of continuity method electric furnace smelting magnesium metal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282605A (en) * | 2016-09-14 | 2017-01-04 | 李华梅 | Magnesium oxide produces magnesium metal with carbon with vacuum microwave heating |
| CN106756107A (en) * | 2016-12-27 | 2017-05-31 | 深圳市中启新材料有限公司 | A kind of vacuum microwave magnesium smelting device |
| CN107739848A (en) * | 2017-10-19 | 2018-02-27 | 山西恒天镁业有限公司 | The Application way of magnesium condensation heat during a kind of production of magnesium by pidgeonprocess |
| CN114318011A (en) * | 2022-01-25 | 2022-04-12 | 郭建文 | Metal magnesium smelting device and process by full-continuous thermal reduction method |
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| CN101376928A (en) * | 2008-10-10 | 2009-03-04 | 重庆高岭投资（集团）有限公司 | Process for smelting magnesium by microwave heating Pidgeon process |
| CN101892395A (en) * | 2010-06-12 | 2010-11-24 | 安泰科技股份有限公司 | Method for smelting magnesium by decomposition in vacuum through microwaves |
| CN103862060A (en) * | 2014-03-25 | 2014-06-18 | 张培杰 | Device and method for preparing magnesium powder |
| CN104120282A (en) * | 2014-07-21 | 2014-10-29 | 东北大学 | Method for smelting magnesium quickly and continuously |
| KR101501653B1 (en) * | 2013-06-17 | 2015-03-12 | 재단법인 포항산업과학연구원 | Continuous Mg refining apparatus by vacuum reduction method |
| CN204594220U (en) * | 2015-02-10 | 2015-08-26 | 苏杭 | Magnesium metal smelting microwave reduction stove |
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2015
- 2015-11-09 CN CN201510749995.6A patent/CN105420516B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101376928A (en) * | 2008-10-10 | 2009-03-04 | 重庆高岭投资（集团）有限公司 | Process for smelting magnesium by microwave heating Pidgeon process |
| CN101892395A (en) * | 2010-06-12 | 2010-11-24 | 安泰科技股份有限公司 | Method for smelting magnesium by decomposition in vacuum through microwaves |
| KR101501653B1 (en) * | 2013-06-17 | 2015-03-12 | 재단법인 포항산업과학연구원 | Continuous Mg refining apparatus by vacuum reduction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282605A (en) * | 2016-09-14 | 2017-01-04 | 李华梅 | Magnesium oxide produces magnesium metal with carbon with vacuum microwave heating |
| CN106756107A (en) * | 2016-12-27 | 2017-05-31 | 深圳市中启新材料有限公司 | A kind of vacuum microwave magnesium smelting device |
| CN107739848A (en) * | 2017-10-19 | 2018-02-27 | 山西恒天镁业有限公司 | The Application way of magnesium condensation heat during a kind of production of magnesium by pidgeonprocess |
| CN114318011A (en) * | 2022-01-25 | 2022-04-12 | 郭建文 | Metal magnesium smelting device and process by full-continuous thermal reduction method |
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