CN103602833A - Improved pidgeon-process magnesium refining process - Google Patents
Improved pidgeon-process magnesium refining process Download PDFInfo
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- CN103602833A CN103602833A CN201310571702.0A CN201310571702A CN103602833A CN 103602833 A CN103602833 A CN 103602833A CN 201310571702 A CN201310571702 A CN 201310571702A CN 103602833 A CN103602833 A CN 103602833A
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Abstract
The invention relates to an improved pidgeon-process magnesium refining process. The process comprises the following steps: roasting dolomite, adding silicon iron and fluorite, metering and burdening, and pressing into a pellet material after mixing and grinding; and placing the pellet material into a horizontal type reducing tank for carrying out vacuum thermal reduction and rough magnesium refining. The improved pidgeon-process magnesium refining process is characterized in that the pellet material is pressed into a honeycomb briquette-shaped disc type pellet material instead of a peach-pit-shaped pellet material in a conventional process; a concave large notch and three anti-falling ad positioning semicircular slots are respectively formed in the outer edge of the disc surface of the honeycomb briquette-shaped disc type pellet material; a positioning semicircular concave port for loading and unloading is formed in the edge of a honeycomb hole in the center of the disc surface. According to the improved pidgeon-process magnesium refining process disclosed by the invention, by reasonably designing the shape of the pellet material, carrying out matched improvement and other auxiliary means onto a reducing tank and changing the placing state of the canned pellet material, filling coefficient is improved and single-tank filling amount is increased; meanwhile, heat energy distribution in the reducing tank can be improved, heating efficiency is improved, reducing effect of the pellet material is improved, single-tank yield is increased, and finally purposes of not only increasing yield, but also saving energy, lowering consumption and lowering cost are realized.
Description
Technical field
The present invention relates to Metal smelting technical field, particularly relate to a kind of improving technology of production of magnesium by pidgeonprocess technique.
Background technology
Pidgeon process (process for smelting magnesium) is invented by Canadian Toronto college professor L.M.Pidgeon, belongs to the silicothermic process in vacuum metallurgy, is called for short silicothermic process, is the main method of production MAGNESIUM METAL.With calcination or calcined dolomite, (be commonly called as and forge whitely, CaO+MgO) be raw material, ferrosilicon (FeSi75) is reductive agent to the method, adds appropriate fluorite (CaF
2), after batching, combined grinding, be pressed into peach-pit shape pelletizing feed.A material is put into refractory alloy steel vacuum reducing tank (inside is evacuated to 13.3～1.33Pa or higher vacuum tightness), be heated to 1200 ± 10 ℃ of (boiling point T of magnesium
b.p.=1107 ℃), by Si, reduce and forge the magnesium oxide (MgO) in white, generate magnesium vapor and calcium silicate slag (2CaOSiO
2) enter crystallization magnesium (crude magnesium) in the condenser of reduction tank front end after separation, after coming out of the stove, through refining, can obtain highly purified MAGNESIUM METAL again.
Cobbler's method has that technique is simple, good product quality, small investment of production equipment, fast, the feature such as scale is flexible of founding the factory.China's rhombspar distributes wide, there is the condition that production of magnesium by pidgeonprocess is good, in the eighties in last century to the nineties, stimulated by the international MAGNESIUM METAL market requirement, China's production of magnesium by pidgeonprocess fast development, become MAGNESIUM METAL big producing country, the period of great prosperity, former magnesium annual production accounted for 2/3 of global output, and Pidgeon process becomes main flow production method (have data to show and account for 98%～99%).In recent years, because international demand subtracts greatly, badly influence China's MAGNESIUM METAL industry, many enterprises are forced to subtract, stop production, as 2011 yearly capacities have reached 1,580,000 tons, and approximately 660,000 tons of actual outputs.
Traditional production of magnesium by pidgeonprocess technique, its group's material is pressed into walnut shape, after tinning, be nature and stack state, reduction tank packing factor is low, charge amount is limited, not only affect heat energy distribution and rate of heating and the bed rearrangement reduction furnace heat utilization rate of rolling into a ball material in tank, finally the reduction effect of the group's of having influence on material and single tank output, make production cost high.Therefore, providing a kind of can increase production, and the production of magnesium by pidgeonprocess technique that can save energy again, reduces production costs has very important realistic meaning for China's magnesium industry development.
Summary of the invention
The object of the invention is to overcome the above-mentioned defect of existing Technology, provide a kind of effective raising single tank production capacity, energy-saving and cost-reducing, the improvement production of magnesium by pidgeonprocess technique reducing costs.
The technical scheme taked is for achieving the above object:
A kind of improvement production of magnesium by pidgeonprocess technique, comprise calcined dolomite, add ferrosilicon and fluorite, batching, after combined grinding, suppress agglomerating material, this group's material is put into horizontal reduction tank and carry out vacuum-thermal reduction generation crude magnesium, again by crude magnesium refining, it is characterized in that described group material is pressed into honeycomb coaly disc type group material, in the card of this honeycomb coaly disc type group material, be uniform-distribution with several penetrating taffonis, biscuit outer is respectively equipped with a large breach of spill and three anti-down and location semicircle grooves, and edge has location semi-circular notch for a handling material on the centre hole at card center.
Described anti-downly have left and right, lower three (two of its middle left and rights be positioned at horizontal diameter two ends with location semicircle groove, below one be positioned at perpendicular diameter lower end), they and the large breach of spill are arranged on the card outer (the large breach of spill is positioned at perpendicular diameter top) of honeycomb coaly disc type group material.
Described handling material is arranged on centre hole near a side of the large breach of spill by location semi-circular notch.
The setting successively vertically in horizontal reduction tank of described honeycomb coaly disc type group's material, and the large breach of spill unanimously rushes to.
The thickness that described honeycomb coaly disc type is rolled into a ball material is roughly suitable with the mean distance between the taffoni on group's charging tray face.
In the inner tank wall of described horizontal reduction tank, be cast with respectively vertically with honeycomb coaly disc type group material three are anti-down and location semicircle groove is suitable three semicircles anti-down with location convex tendon, and between three semicircle convex tendon terminations of reduction tank head plate one side, be cast with two location gear wings, to keep the reasonable placement location of biscuit in reduction tank.
the present invention is by the laying state to after an appropriate design of material shape and the material tinning of change group, thereby improve packing factor, the increase one-pot material amount of reduction tank, can improve again heat energy distribution in tank, improve thermo-efficiency simultaneously, improve group's material reduction effect, improve single tank production capacity, final volume increase and the object of saving energy and reduce the cost, reducing costs of realizing.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch of honeycomb coaly disc type group material in the present invention.
Embodiment
Improvement production of magnesium by pidgeonprocess technique of the present invention, production of magnesium by pidgeonprocess technique with prior art is the same, technique comprises calcined dolomite, add ferrosilicon and fluorite, batching, after combined grinding, suppress agglomerating material, this group's material is put into horizontal reduction tank and carry out vacuum-thermal reduction generation crude magnesium, again by crude magnesium refining, improvement is an improvement for material shape, adopt special-purpose pressing unit that a material is pressed into honeycomb coaly disc type group material, the external diameter of this honeycomb coaly disc type group material should be slightly less than vacuum tank internal diameter, when compacting, reserve the round hole being evenly distributed, be called taffoni 1-2, described taffoni 1-2 has a centre hole 1-5 in plate-like group material center, all the other become emitting shapes to be evenly distributed in card (generally in centre hole has outward, outer two circles, as 8 of inner rings, 15～16 of outer rings), centre hole operated by rotary motion is larger than other hole, as approximately desirable in centre hole
φ40～50 mm, other hole is desirable
φ20.For ease of magnesium vapor migration, flow, biscuit top reserves approximately
φthe large breach 1-1 of 100 spill is as the concentrated passage of magnesium steam, to allow the magnesium steam restoring enter smoothly crystallizer.The large breach 1-1 of this spill of when filling with substance in tank unanimously upward.At centre hole, by large breach one side of spill, add and stay
φ15 location semi-circular notch 1-3, expects adaptive semicircle convex tendon on special manipulator (through centre hole) armed lever by handling, and convex-concave matches, flat location when wearing (string data) and entering tank, prevents that rotation from misplacing each other.In biscuit outer, also reserve left and right, lower three anti-down with location half slot 1-4(when filling with substance along reduction tank both sides and bottom
φthree semicircle location convex tendon correspondences of 16 pack into), these three (left and right, under) semicircles are anti-down to be located on the card outer that honeycomb coaly disc type group expects with locating slot 1-4 and the large breach 1-1 of spill (two of its middle left and rights are positioned at horizontal diameter two ends, below one be positioned at perpendicular diameter lower end; The large breach of spill is positioned at perpendicular diameter top).
In the present invention, the mean distance between the Thickness Design one-tenth of honeycomb coaly disc type group material and card taffoni 1-2 is roughly suitable, like this, from reaction kinetics point of theory, area quite (without hole) disk is roughly suitable by the diffusion length of inner reaction interface outside (taffoni wall) by the internal-response interface distance that outwards (two cards) spreads and the quite virtual hollow cylinder of volume (or round buss).Like this, can be considered in disc type group material and both carried out the reaction of axial bidirectional plate (disk) contracting core pattern, (taffoni unreacted core radius around is constantly becoming large in " contracting core pattern " reaction of the quite virtual hollow cylinder of volume that the inwall that all taffonis are around also carrying out simultaneously advances to surrounding, and the accurate interfacial phase of taffoni reaction between any two to and enter, unreacted group's material " core " part between making it is constantly dwindled), total reaction is formed in parallel by two shrinking core models.The inventor has also derived the macro-kinetic model that uses such honeycomb fashion dish type group material reduction reaction theoretically, and proof can shorten the reduction reaction time (being only that half of recovery time expected by stack pile disk or plate shaped group) greatly.
Guaranteeing that biscuit has under the prerequisite of some strength and the smooth demoulding and compacting qualification rate, honeycomb coaly disc type group material can be made as and encircle arc hole by the large breach 1-1 of spill side part taffoni, be conducive to magnesium vapor migration.
In order to adapt to the improvement of above-mentioned group material, the present invention has made reduction tank corresponding supporting improvement simultaneously, in the inner tank wall of horizontal reduction tank, be cast with respectively vertically left and right, lower three semicircles that with honeycomb coaly disc type group material three are anti-down and location half slot 1-4 is suitable (
φ16) anti-down and location convex tendon (reduction tank inwall left and right, lower three semicircles that axially casting is stayed (
φ16) anti-down and location convex tendon, can be pore size (as 20 ~ 30mm) according to the difference of reduction tank internal diameter and honeycomb fashion biscuit external diameter, by suitable " padded " (cross section is to add certain thickness wide rectangle under semicircle) of semicircle convex tendon, so both guaranteed location, be convenient to again tinning.), and by casting between three convex tendon terminations of end socket side, reserve two biscuits location gear wings (three convex tendon terminations of 50 * 50 * 20, two gear wings and end socket side are in a plane together) at reduction tank body, can prevent that like this biscuit from tilting, fall and rotate dislocation.Condenser portion must be done suitable dilatation simultaneously; Fuel manipulator crane tool hand that again must configure dedicated (used by long-arm manipulator and the collocation of galianconism mechanical manipulator, mechanical manipulator armed lever top have one with armed lever isometric and with the suitable semicircle convex tendon of location semicircle groove above biscuit centre hole, convex-concave matches, penetrates in turn each other, conveniently feeds into tank smoothly).
Claims (6)
1. improve production of magnesium by pidgeonprocess technique for one kind, comprise calcined dolomite, add ferrosilicon and fluorite, batching, after combined grinding, suppress agglomerating material, this group's material is put into horizontal reduction tank and carry out vacuum-thermal reduction generation crude magnesium, again by crude magnesium refining, it is characterized in that described group material is pressed into honeycomb coaly disc type group material, in the card of this honeycomb coaly disc type group material, be uniform-distribution with several penetrating taffonis (1-2), biscuit outer is respectively equipped with a large breach of spill (1-1) and three anti-down and location semicircle grooves (1-4), and the centre hole (1-5) at card center is upper along having location semi-circular notch (1-3) for a handling material.
2. according to improvement production of magnesium by pidgeonprocess technique claimed in claim 1, it is characterized in that describedly anti-downly having left and right, lower three with location semicircle groove (1-4), they and the large breach of spill (1-1) are arranged on the card outer of honeycomb coaly disc type group material.
3. according to improvement production of magnesium by pidgeonprocess technique claimed in claim 1, it is characterized in that described handling material is arranged on centre hole near a side of the large breach of spill (1-1) by location semi-circular notch (1-3).
4. according to improvement production of magnesium by pidgeonprocess technique claimed in claim 1, it is characterized in that the setting successively vertically in horizontal reduction tank of described honeycomb coaly disc type group's material, and the large breach of spill (1-1) unanimously rushes to.
5. according to improvement production of magnesium by pidgeonprocess technique claimed in claim 1, it is characterized in that the thickness of described honeycomb coaly disc type group material is roughly suitable with the mean distance between the taffoni (1-2) of rolling into a ball on charging tray face.
6. according to the improvement production of magnesium by pidgeonprocess technique described in claim 1 or 4, it is characterized in that being cast with respectively vertically in the inner tank wall of described horizontal reduction tank with honeycomb coaly disc type group material three are anti-down and location semicircle groove (1-4) is suitable three semicircles anti-down with location convex tendon, and between three semicircle convex tendon terminations of reduction tank head plate one side, be cast with two location gear wings.
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| CN201310571702.0A CN103602833B (en) | 2013-11-15 | 2013-11-15 | Improved pidgeon-process magnesium refining process |
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| CN201310571702.0A CN103602833B (en) | 2013-11-15 | 2013-11-15 | Improved pidgeon-process magnesium refining process |
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| CN103602833A true CN103602833A (en) | 2014-02-26 |
| CN103602833B CN103602833B (en) | 2015-02-25 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676620A (en) * | 2005-04-22 | 2005-10-05 | 纪礽辉 | Ore dressing process for reducing magnetic iron ore from hematite carbonaceous pelletizing |
| CN101113494A (en) * | 2006-07-25 | 2008-01-30 | 贵州世纪天元矿业有限公司 | Reducing agent for smelting magnesium by thermal reduction process |
| 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 |
-
2013
- 2013-11-15 CN CN201310571702.0A patent/CN103602833B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1676620A (en) * | 2005-04-22 | 2005-10-05 | 纪礽辉 | Ore dressing process for reducing magnetic iron ore from hematite carbonaceous pelletizing |
| CN101113494A (en) * | 2006-07-25 | 2008-01-30 | 贵州世纪天元矿业有限公司 | Reducing agent for smelting magnesium by thermal reduction process |
| 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 |
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