CN102409185A - Novel reduction method in pidgeon magnesium refining process - Google Patents
Novel reduction method in pidgeon magnesium refining process Download PDFInfo
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- CN102409185A CN102409185A CN2011103590863A CN201110359086A CN102409185A CN 102409185 A CN102409185 A CN 102409185A CN 2011103590863 A CN2011103590863 A CN 2011103590863A CN 201110359086 A CN201110359086 A CN 201110359086A CN 102409185 A CN102409185 A CN 102409185A
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Abstract
The invention relates to reduction steps in a pidgeon magnesium refining process, in particular to a novel reduction method in the pidgeon magnesium refining process. The method comprises the following steps of: heating a reduction tank filled with pellets to the temperature of between 1,100 and 1,300 DEG C; keeping the temperature under vacuum; and performing a reduction reaction. The method is characterized by comprising the following step of: rotating the reduction tank in the heating process. By the reduction method, materials in the reduction tank can be stirred by rotating the reduction tank, so that the materials in the middle of the reduction tank can acquire heat in time; simultaneously, the working condition of high reaction vapor pressure of the materials in the middle is broken through, so that the materials can be fully reduced, reduction time is shortened, and reduction temperatures are reduced; and preset reduction time can be shortened to 6 hours, the average ratio of the materials to magnesium reaches 5.8 to 6.0, and standard fuels for reducing each ton of magnesium are reduced by 1,000kg.
Description
Technical field
The present invention relates to the reduction step in the production of magnesium by pidgeonprocess technology, especially the novel method of reducing in the production of magnesium by pidgeonprocess technology.
Background technology
Production of magnesium by pidgeonprocess is with being pressed into pellet after the rhombspar after the calcining and a certain amount of ferrosilicon (reductive agent) powder process mixing, the pellet that is pressed into is placed in the reduction jar, being pumped into the vacuum that is lower than below the 13Pa in jar; The reduction jar is placed in the process furnace (being reduction furnace again); Under the temperature about 1200 ℃, heat; Make the rhombspar (MgO+CaO) after the calcining carry out reduction reaction with ferrosilicon; Thereby displace MAGNESIUM METAL 99, the MAGNESIUM METAL 99 steam that displaces runs into outside jar by the mold post crystallization after the recirculated water cooling, becomes crude magnesium.The main purpose that is evacuated in the reduction jar is to reduce the energy----Gibbs free energy of reduction reaction, makes it under 1200 ℃ operating mode, realize reduction reaction.Different vps needs different temperature of reaction, and vp is big more, and the temperature of reaction needed is high more.
Present reducing process generally is that temperature realizes reduction in the stove that (reaches as high as 1280) more than 1220 ℃, and the recovery time is 11～12 hours, expects that on average magnesium is about 6.2～6.5 than (pellet weight/go out magnesium amount).In fact; Vacuum reaches below the 13Pa in the reduction jar; Reaction began when temperature reached 1180 ℃ in jar; Material magnesium ratio can reach 5.4～5.6 during the Theoretical Calculation complete reaction, needs so long recovery time and high reduction temperature so why, and material magnesium can not be realized fully reduction than very high.The analysis reason has: 1, reaction is thermo-negative reaction; Heat is given in no convection current under vacuum; The thermal conductivity of pelletizing is very little, outside atmosphere to the heat transfer process of the heat transfer of pelletizing, product layer to reaction play a part very importantly, promptly rate of heat transfer is very important to the influence of overall reaction rate.Residue after the reduction reaction is β-2CaOSiO2, the non-constant of its thermal conductivity.And jar interior heat exchange has only material to conduct heat and the radiogenic heat of reduction tank skin, and reduction back, top layer expects that slag low heat conductivity and barrier effect have influenced the heat absorption of materials inside, reaches the time that reduction requires temperature thereby influence materials inside.2, after the reduction reaction, magnesium steam will in time be discharged, and the discharge of inner magnesium steam receives the influence of outside material and reaction magnesium steam, can not in time discharge, and has improved inner vp, thereby has improved the temperature of reaction of materials inside.Two reasons impel the recovery time elongated.3, owing to the influence of received heat transmission, center material (11～12 hours) within a certain period of time can not reach reduction reaction temperature, thus there is partial material to can not get effective reduction, thus influence reduction efficiency.4, because the prolongation of recovery time causes the raising of process energy consumption simultaneously.Therefore how to realize effective reduction, realize the reduction reaction maximization, the recovery time is the shortest, is the problem that production of magnesium by pidgeonprocess need solve always.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can improve reduction efficiency, shorten the recovery time, thus the novel method of reducing in the production of magnesium by pidgeonprocess technology that significantly cuts down the consumption of energy.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
Novel method of reducing in a kind of production of magnesium by pidgeonprocess technology comprises the reduction jar that pellet is housed is heated to 1100-1300 degree centigrade, thereby and under vacuum condition, keeps carrying out reduction reaction, its special feature to be that the reduction jar rotates when being heated.
Wherein reduction jar clockwise or counterclockwise rotation around its axis.
Wherein a reduction jar speed of rotation is 0.1～3 rev/min.
Wherein the recovery time is 5-7 hour.
Adopt method of reducing of the present invention; Realize reducing the stirring of jar interior material through reducing jar to rotate, make a reduction jar intermediate material in time obtain heat, break the high operating mode of intermediate material reaction vapor pressure simultaneously; Realize the abundant reduction of material, shorten the recovery time and reduce reduction temperature.The expection recovery time can shorten to 6 hours, expects that on average the magnesium ratio reaches 5.8～6.0, and ton magnesium operation unit consumption reduces 1000Kg mark coal.
Embodiment
Embodiment 1:
1, dolomite calcination;
2, batching system ball: will forge white, ferrosilicon powder (75%Si) and fluorite powder (94%CaF
2) by 79.8: 17.1: 3.1 part by weight batching, grindings, suppress balling-up then.
Reduction: the 190kg pellet is heated to 1200 ℃ in the reduction jar of Φ 377 * 3100, under less than the 13.3Pa vacuum condition, 0.5 rev/min, kept 5～7 hours, Natural manganese dioxide is reduced into magnesium vapor, and the condensation post crystallization becomes crude magnesium.
The difference of the inventive method and existing method of reducing is to make original immobilized reduction jar to rotate, thereby realizes high efficiency reduction, through experimental result is compared, obtains the index contrast table of following new old technology:
Claims (4)
1. the novel method of reducing in the production of magnesium by pidgeonprocess technology comprises the reduction jar that pellet is housed is heated to 1100-1300 degree centigrade, thereby and under vacuum condition, keep carrying out reduction reaction, it is characterized in that: reduction jar rotation when being heated.
2. the novel method of reducing in the production of magnesium by pidgeonprocess technology as claimed in claim 1 is characterized in that: wherein reduction jar clockwise or counterclockwise rotation around its axis.
3. the novel method of reducing in the production of magnesium by pidgeonprocess technology as claimed in claim 1 is characterized in that: wherein a reduction jar speed of rotation is 0.1～3 rev/min.
4. the novel method of reducing in the production of magnesium by pidgeonprocess technology as claimed in claim 1 is characterized in that: wherein the recovery time is 5-7 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103590863A CN102409185A (en) | 2011-11-14 | 2011-11-14 | Novel reduction method in pidgeon magnesium refining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103590863A CN102409185A (en) | 2011-11-14 | 2011-11-14 | Novel reduction method in pidgeon magnesium refining process |
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| CN102409185A true CN102409185A (en) | 2012-04-11 |
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| CN2011103590863A Pending CN102409185A (en) | 2011-11-14 | 2011-11-14 | Novel reduction method in pidgeon magnesium refining process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388084A (en) * | 2013-07-15 | 2013-11-13 | 董家驭 | Magnesium metal reduction furnace with rotary reduction retort |
| CN113737019A (en) * | 2021-08-25 | 2021-12-03 | 西安交通大学 | Method and device for continuously extracting crystallized magnesium in Pidgeon magnesium smelting process at high temperature |
Citations (6)
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| CN2443004Y (en) * | 2000-09-30 | 2001-08-15 | 于洪喜 | Internal heating magnesium smelting furnace |
| CN101157989A (en) * | 2007-10-18 | 2008-04-09 | 中南大学 | Induction heating continuous magnesium-smelting system and continuous magnesium-smelting technique |
| 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 |
| CN101643850A (en) * | 2009-07-16 | 2010-02-10 | 重庆大学 | Method for preparing nonferrous metal by vacuum thermal recovery |
| CN101748292A (en) * | 2008-12-15 | 2010-06-23 | 辛卫亚 | Tilting charge and discharge type reducing furnace and reducing method thereof |
| CN201942729U (en) * | 2010-12-13 | 2011-08-24 | 昆明理工大学 | Semi-continuous vacuum induction heating magnesium reduction furnace |
-
2011
- 2011-11-14 CN CN2011103590863A patent/CN102409185A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2443004Y (en) * | 2000-09-30 | 2001-08-15 | 于洪喜 | Internal heating magnesium smelting furnace |
| CN101157989A (en) * | 2007-10-18 | 2008-04-09 | 中南大学 | Induction heating continuous magnesium-smelting system and continuous magnesium-smelting technique |
| 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 |
| CN101748292A (en) * | 2008-12-15 | 2010-06-23 | 辛卫亚 | Tilting charge and discharge type reducing furnace and reducing method thereof |
| CN101643850A (en) * | 2009-07-16 | 2010-02-10 | 重庆大学 | Method for preparing nonferrous metal by vacuum thermal recovery |
| CN201942729U (en) * | 2010-12-13 | 2011-08-24 | 昆明理工大学 | Semi-continuous vacuum induction heating magnesium reduction furnace |
Non-Patent Citations (1)
| Title |
|---|
| 杨重愚主编: "《轻金属冶金学》", 30 June 1991, 冶金工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388084A (en) * | 2013-07-15 | 2013-11-13 | 董家驭 | Magnesium metal reduction furnace with rotary reduction retort |
| CN103388084B (en) * | 2013-07-15 | 2014-08-20 | 董家驭 | Magnesium metal reduction furnace with rotary reduction retort |
| CN113737019A (en) * | 2021-08-25 | 2021-12-03 | 西安交通大学 | Method and device for continuously extracting crystallized magnesium in Pidgeon magnesium smelting process at high temperature |
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Application publication date: 20120411 |