CN1804086A - Method for preparing low-carbon manganous iron - Google Patents
Method for preparing low-carbon manganous iron Download PDFInfo
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- CN1804086A CN1804086A CN 200510048744 CN200510048744A CN1804086A CN 1804086 A CN1804086 A CN 1804086A CN 200510048744 CN200510048744 CN 200510048744 CN 200510048744 A CN200510048744 A CN 200510048744A CN 1804086 A CN1804086 A CN 1804086A
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Abstract
The manufacture method for low-carbon Fe-Mn comprises: adding FeSi75A11.0-A with 0.5-80mm size by ratio as 0.1-0.35:1 per ton slag into rocking furnace; pouring medium-Mn-slag thermal liquid; rocking the furnace on rocking machine; adding two thirds rich manganese ore into fining furnace for melting; pouring the thermal liquid with intermediate alloy by ratio to former manganese ore as 1:2.4 into the furnace and residual manganese ore. This invention makes full use of heat energy, uses Si to replace the Mn from MnO, and has Mn-content in final slag less than 8%.
Description
Technical field
The present invention relates to manganese is the production technology of iron alloy product, particularly a kind of production method of low-carbon ferromanganese.
Background technology
Usually medium-low carbon ferromanganese is classified as a big series products in the correlation technique handbook, in fact owing to product carbon content difference, its production technique is distinguished to some extent.The low carbon ferromanganese carbon content is less than 0.7%, and mid-carbon fe-mn carbon content＞0.7%≤2.0%, medium-low carbon ferromanganese are widely used in the production of special steel and welding electrode, and one ton of steel mean consumption of every in the world at present production low carbon ferromanganese is roughly equal to 0.7～1.0 kilogram.
There are three classes to produce the method for medium-low carbon ferromanganese: electro-silicothermic process, grate method, blow oxygen.And each big class derives several different methods according to its different characteristics, divides hot and cold dress method, low alkalinity method again as electro-silicothermic process; The grate method is divided the outer preliminary refining method of grate stove, grate purifying method again; Blow oxygen divides oxygen decarburization method and oxygen blast desiliconization method.In a word, the whole bag of tricks all has its advantage and deficiency, has plenty of the emphatically utilization of heat energy, has plenty of the rate of recovery that improves manganese emphatically, also have both have both at the same time.
Produce low carbon ferromanganese with electro-silicothermic process and grate method, the product carbon containing mainly comes from the electric furnace from the corrode of training electrode.
What the electro-silicothermic process initial stage adopted is cold charge technology, exactly with in the refining furnaces of packing into such as manganese-silicon ingot and manganese ore, lime.Late 1960s, liquid manganese-silicon is poured into the heat of refining furnace and converted the technical study success, compare with cold charge technology, medium-low carbon ferromanganese power consumption decline 400～800kwh/t per ton, demonstrate bigger competitive edge, very fast being converted by heat replaced cold charge technology, become the main flow that medium-low carbon ferromanganese is produced, the medium-low carbon ferromanganese of producing with hot-metal process accounts for more than 80% at present, but slag contains manganese and cold charge technology quite about 20%, generally heat is converted slag that technology produces as the raw material of producing manganese-silicon at present.
It is a kind of energy-saving smelting new technology that just grows up after the seventies in 20th century that the grate method is smelted medium-low carbon ferromanganese, this method is converted on the basis of technology in heat, the manganese silicon liquid that middle manganese slag that refining furnace is come out and manganese silicon stove come out carries out heat and converts in shaking ladle, realizing that desiliconization increases manganese under the agitation condition preferably, improve the throughput of manganese metal recovery rate and electric refining furnaces, compare with electro-silicothermic process, grate method technology is more advanced, can improve 14～17 percentage points manganese recovery ratio, power consumption is converted on the technology basis in heat and is reduced by 150～250kwh/t, produces reliable and stable.
Summary of the invention
The invention provides a kind of low carbon ferromanganese production method, this method adds ferrosilicon FeSi75 in grate, the middle manganese slag hydrothermal solution that refining furnace is obtained is to going in the grate then, the effect of shaking with grate makes ferrosilicon fully contact with middle manganese slag hydrothermal solution, the difference of specific gravity of manganese slag and ferrosilicon in overcoming, utilize Si in the ferrosilicon and the MnO in the middle manganese slag to carry out the heat energy that chemical reaction emits and make the ferrosilicon fusing, displace Mn among the MnO by Si, make finishing slag contain manganese and be lower than 8%, in the present invention, ferrosilicon joins in the grate with cold conditions, utilizes Si and the MnO in the middle manganese slag in the ferrosilicon to carry out thermopositive reaction fusing ferrosilicon, has effectively utilized heat energy.
The present invention by refining furnace slag tap operation, grate batching and preliminary refining operation, finishing slag shrend operation, master alloy is blended into the refining furnace batching and refining procedure, low carbon ferromanganese hydrothermal solution casting operation and finishing procedure are formed, the operation of slagging tap from refining furnace obtain to contain 1500 ℃ in manganese 20～22%, temperature manganese slag hydrothermal solution, it is characterized in that:
Described grate batching, the preliminary refining operation is the ferrosilicon FeSi75Al1.0-A that at first adds 0.5～80mm granularity in grate, be blended into middle manganese slag hydrothermal solution then through weighing, the required ferrosilicon amount of allocating into of manganese slag is 1: 0.1～0.35 in per ton, grate placed on the grate machine shake, the formation ocean wave type seethes, the effect of seething is that ferrosilicon is fully contacted with middle manganese slag hydrothermal solution, the difference of specific gravity of manganese slag and ferrosilicon in overcoming, utilize in the ferrosilicon MnO among the Si and middle manganese slag to carry out the heat energy that chemical reaction emits and make the ferrosilicon fusing, displace Mn among the MnO by Si, reach and reduce the manganiferous purpose of slag.Reaction formula is:
。
It is master alloy and rich manganese ore 1: 2.4 ratio by weight that described master alloy is blended into refining furnace batching and refining procedure, draw the consumption of rich manganese ore, rich manganese ore with 2/3 adds refining furnace and fusing earlier, then the master alloy hydrothermal solution is blended into refining furnace, add remaining 1/3 rich manganese ore again, further rising manganese falls silicon, makes alloying constituent reach the production method of low carbon ferromanganese composition requirement.
Production process of the present invention is the interlocks of two stoves, and two stoves are discontinuous running, and the molten iron of last cycle refining furnace output is the product in this cycle, and the manganese slag is blended into the raw material of grate in the by product of generation for the back one-period.The outer pre-smart process of whole stove does not need heating.Finishing slag shrend operation is that other composition except that master alloy (high ferro-silico-manganese) is injected the process of pond shrend, and the finishing slag after grate preliminary refining contains manganese and is lower than 8%, is the ideal cement raw material.
The middle manganese slag of described refining furnace output is all to going into grate; Grate places on the grate machine; shut down after shaking grate 8～15min with the rotating speed of eccentricity 50～150mm, 45～80r/min; leave standstill after 3 minutes grate is lifted by crane, upper strata scum silica frost in the stove is cast aside into the pond carried out the Water Quenching Slag processing, continue the lifting grate master alloy is introduced refining furnace by chute.
After grate was finished periodic job, master alloy is blended into refining furnace, FeSi75Al1.0-A put into grate with the weighing ferrosilicon, utilizes the waste heat of grate that ferrosilicon is carried out drying.
Description of drawings
Fig. 1 is a kind of low carbon ferromanganese production method process flow sheet that the present invention proposes.
Embodiment
1 of 3200KVA electric refining furnaces; 14m
31 of grate, useful volume: 2.5～10m
31 in grate machine, rotating speed: 45～80r/min, eccentricity: 50～150mm; The one-stop operation time: 8～15min; 8m
3Cinder ladle and hot metal ladle: 6; 50 tons of drivings: 1.
Production process of the present invention relates to the interlock of two stoves, two stoves are periodic job, but be closely connected again between working cycle, the molten iron of last cycle refining furnace output is the product in this cycle, and the manganese slag is blended into the raw material of grate in the by product of generation for the back one-period.
Embodiment 1
After grate is finished periodic job emptying slag and master alloy, 1055 kilograms of ferrosilicon FeSi75Al1.0-A that add granularity 0.5～80mm to grate, composition is (weight ratio): Si 74～80, C 0.1, P 0.035, S 0.02, utilizes the grate waste heat that ferrosilicon is carried out drying and preheating.
From refining furnace emit manganese slag hydrothermal solution and from other production process obtain manganese slag hydrothermal solution go into cinder ladle, composition is (weight ratio): Mn 21, CaO 36.7, SiO
232.4, MgO 3.4, metering slag liquid weight is blended into manganese slag hydrothermal solution in 7700 kilograms in grate.
Grate is placed on the grate machine, and with 45 rev/mins, 150 millimeters of eccentricitys, running 10 minutes, the eccentric force of utilizing grate machine eccentric wheel to produce made melt form ocean wave type in grate and seethes, in the reinforcement ferrosilicon in Si and the middle manganese slag MnO carry out chemical reaction.Reach the back runtime and shut down, left standstill 3 minutes.
The lifting grate is cast aside scum silica frost and is gone into the cinder ladle shrend, gets the slag specimen analysis and is: Mn 6.82, SiO
229.5, CaO 33.4, the quantity of slag is about 3860 kilograms.
With the grate operation while, after refining furnace is finished last discontinuous running emptying slag and molten iron, add 2773 kilograms of rich manganese ores, composition is: Mn 42, Fe 3.1, CaO 4.1, SiO
27.2 and adding control basicity 1.2 required lime (CaO is greater than 85), 25 kilograms of fluorites melt.
It is synchronization that control refining furnace finishing material and grate skim scum silica frost, and the lifting grate is introduced refining furnace to the master alloy melt by chute.The master alloy composition is: Mn 67, Si 22.3, C 0.08, P 0.06, weight is 1748 kilograms.
Carry out rising manganese to 1422 kilograms of rich manganese ores of refining furnace adding again and fall the silicon refining, 1.5 hours time, come out of the stove after the sampling analysis composition is qualified, middle manganese slag is blended into the raw material of grate as next working cycle, molten iron becomes the low carbon ferromanganese product through casting, finishing, composition: Mn 81.1, Si 1.2, C0.5, P0.18, weight is 2500 kilograms.
Embodiment 2～4
According to the identical technological process of embodiment 1, master alloy and rich manganese ore 1: 2.4 by weight percentage, (rich manganese ore composition is: Mn 42, Fe 3.1, CaO 4.1, SiO
27.2), the grate machine with 80 rev/mins, 50 millimeters of eccentricitys, running 15 minutes, per ton in the required ferrosilicon amount of allocating into of manganese slag be respectively: 1: 0.05; 1: 0.2; 1: 0.35 o'clock, the low carbon ferromanganese product contains manganese and finishing slag contains manganese, saw Table 2.
Product under the different proportionings of manganese slag in the table 2/ferrosilicon contains manganese and finishing slag contains manganese (W%)
| Middle manganese slag/ferrosilicon | 1∶0.05 | 1∶0.2 | 1∶0.35 |
| Product contains manganese | 80.3 | 81.4 | 78.6 |
| Finishing slag contains manganese | 11.5 | 7.5 | 6.43 |
Central manganese slag/ferrosilicon is 1: 0.05 o'clock, and finishing slag contains manganese 11.5, illustrates that the ferrosilicon quantity not sufficient is with the MnO in the manganese slag in the reduction, central manganese slag/ferrosilicon is 1: 0.35 o'clock, though finishing slag contains manganese 6.43, the silicone content of master alloy is too high, make manganese quantity not sufficient in the refining furnace, cause product manganese to contain quantity not sufficient.
Embodiment 5～7
According to the identical technological process of embodiment 1, master alloy and rich manganese ore 1: 2.4 by weight percentage, (rich manganese ore composition is: Mn 42, Fe 3.1, CaO 4.1, SiO
27.2), per ton in the required ferrosilicon amount of allocating into of manganese slag be 1: 0.2, grate machine with 60 rev/mins, 100 millimeters of eccentricitys, 5 minutes, 10 minutes, 15 minutes respectively runtime, the low carbon ferromanganese product contains manganese and finishing slag contains manganese, sees Table 3.
The product of table 3 grate different work under the time contains manganese and finishing slag contains manganese (W%)
| Activity duration | 5 minutes | 10 minutes | 15 minutes |
| Product contains manganese | 80.3 | 81.4 | 81.6 |
| Finishing slag contains manganese | 13.23 | 7.42 | 7.25 |
When the grate activity duration was 5 minutes, finishing slag contained manganese 13.23, was more than 10 minutes the time when the grate activity duration, and finishing slag contains manganese and all is lower than 8%.
Claims (4)
1. low carbon ferromanganese production method, by refining furnace slag tap operation, grate batching and preliminary refining operation, finishing slag shrend operation, master alloy is blended into the refining furnace batching and refining procedure, low carbon ferromanganese hydrothermal solution casting operation and finishing procedure are formed, the operation of slagging tap from refining furnace obtain to contain 1500 ℃ in manganese 20～22%, temperature manganese slag hydrothermal solution, it is characterized in that:
Grate batching, preliminary refining operation are the ferrosilicon FeSi75Al1.0-A that at first adds 0.5～80mm granularity in grate, be blended into middle manganese slag hydrothermal solution then through weighing, the required ferrosilicon amount of allocating into of manganese slag is 1: 0.1～0.35 in per ton, grate is placed on the grate machine shake;
It is master alloy and rich manganese ore 1: 2.4 ratio by weight that master alloy is blended into refining furnace batching and refining procedure, calculate the consumption of rich manganese ore, rich manganese ore with 2/3 adds refining furnace and fusing earlier, then the master alloy hydrothermal solution is blended into refining furnace, adds remaining 1/3 rich manganese ore again.
2. according to the described low carbon ferromanganese production of claim 1, it is characterized in that producing the interlock of two stoves, two stoves are discontinuous running, and the molten iron of last cycle refining furnace output is the product in this cycle, and the manganese slag is blended into the raw material of grate in the by product of generation for the back one-period.
3. according to the described low carbon ferromanganese production of claim 1, it is characterized in that: the middle manganese slag of refining furnace output is all to going into grate; Grate places on the grate machine; shake just with the rotating speed of eccentricity 50～150mm, 45～80r/min and to shut down behind grate 8～15min; leave standstill after 3 minutes grate is lifted by crane, upper strata scum silica frost in the stove is cast aside into the pond carried out the Water Quenching Slag processing, continue the lifting grate master alloy is introduced refining furnace by chute.
4. according to the described low carbon ferromanganese production of claim 1, it is characterized in that FeSi75Al1.0-A puts into grate with the weighing ferrosilicon, utilizes the waste heat of grate that ferrosilicon is carried out drying after grate is finished periodic job, master alloy is blended into refining furnace.
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| CN 200510048744 CN1804086A (en) | 2005-12-26 | 2005-12-26 | Method for preparing low-carbon manganous iron |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526066A (en) * | 2013-11-01 | 2014-01-22 | 中钢集团吉林铁合金股份有限公司 | Continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by utilization of slag rich in silicomanganese |
| CN105624438A (en) * | 2016-02-02 | 2016-06-01 | 镇远县鸿丰新材料有限公司 | Method for refining low-carbon ferromanganese alloy through poor-manganese slag |
| CN108588447A (en) * | 2018-06-14 | 2018-09-28 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of production method of metal manganese ingot |
| CN108796252A (en) * | 2018-06-14 | 2018-11-13 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of production method of pure micro-carbon ferromanganese |
-
2005
- 2005-12-26 CN CN 200510048744 patent/CN1804086A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526066A (en) * | 2013-11-01 | 2014-01-22 | 中钢集团吉林铁合金股份有限公司 | Continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by utilization of slag rich in silicomanganese |
| CN105624438A (en) * | 2016-02-02 | 2016-06-01 | 镇远县鸿丰新材料有限公司 | Method for refining low-carbon ferromanganese alloy through poor-manganese slag |
| CN105624438B (en) * | 2016-02-02 | 2018-06-19 | 镇远县鸿丰新材料有限公司 | A kind of method using poor manganese slag refining ferromanganese alloy |
| CN108588447A (en) * | 2018-06-14 | 2018-09-28 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of production method of metal manganese ingot |
| CN108796252A (en) * | 2018-06-14 | 2018-11-13 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of production method of pure micro-carbon ferromanganese |
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