CN104878289A - Ceric rare earth ferrosilicon alloy and production method thereof - Google Patents
Ceric rare earth ferrosilicon alloy and production method thereof Download PDFInfo
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Abstract
The invention belongs to the field of metal smelting, and particularly relates to ceric rare earth ferrosilicon alloy and a production method thereof. The technical problems that existing rare earth ferrosilicon alloy is high in production cost, severe in alloy pulverization and low in rare earth yield. According to the technical scheme, the ceric rare earth ferrosilicon alloy comprises, by mass, 29% to 31% of RE, 49% to 51% of Si, smaller than or equal to 0.1% of Ca and smaller than or equal to 0.5% of Al, wherein the content of Ce/RE is larger than or equal to 85%. The invention further provides the production method of the ceric rare earth ferrosilicon alloy. Rare earth elements are used in a balanced mode through the ceric rare earth ferrosilicon alloy produced through the carbothermy method, the utilization rate of rare earth resources in short supply is effectively increased, the circular economy is energetically developed, and the improvement of the rare earth ferrosilicon production technology is promoted.
Description
Technical field
The invention belongs to Metal smelting field, be specifically related to high cerium mischmetal ferro-silicon and production method thereof.
Background technology
The master alloy that rare earth ferrosilicon alloy is made up of rare earth and ferrosilicon, as the reductor in Iron and Steel Production, sweetening agent and alloy addition, it can make the matrix of steel change, improve the processing characteristics of steel, improve the comprehensive mechanical performance such as weldability, plasticity-, toughness of iron and steel, and the wear-resisting, withstand voltage, against corrosion of iron and steel and flex resistance etc. can be increased.Rare earth ferrosilicon is widely used in foundary industry, has cleaning molten steel, improve as-cast structure at cast steel middle-weight rare earths metal, improves Molten Steel Flow, prevents thermal fission and improves cast steel impelling strength etc.Rare earth ferrosilicon is also used as the nodulizing agent of spheroidal graphite cast iron in a large number, prevents interference element to destroy the effect of nodularization, thus produces the spheroidal graphite cast iron of the various trade mark, such as diesel engine and automobile crane etc.
The method producing rare earth ferrosilicon alloy can be divided into silicothermic process, carbothermy, fused salt electrolysis process, melt and convert method etc. principle, but only has first two method to achieve large-scale industrial production.
One, silicothermic process smelting technology: it is thermal source that so-called silicothermic process refers to electric energy, take ferrosilicon as reductive agent reduction of rare earth mineral aggregate is that rare earth alloy produced by flux with lime.Adopt electric arc furnace smelting equipment, have simple to operate, the working of a furnace is easily grasped, produce flexibly, start-stop is convenient, output high.
(1) reduction by ferrosilicon blast furnace slag: the mid-50, Baotou Iron and Steel Company's rare earth one factory utilizes the achievement in research of Zou Yuan flint, adopt reduction by ferrosilicon containing the blast furnace slag of rare earth, produce rare earth ferrosilicon alloy, start the history that China's rare earth ferrosilicon alloy is produced, but because the rare earth grade of blast furnace slag is lower than 6%, rare earth yield only about 40%, often produce 1t alloy output 5 ~ 7t slag, and energy consumption is high, cost is high, poor product quality, thus limits the application of rare earth ferrosilicon alloy.
(2) the rich slag of poor iron ore deferrization rare earth in reduction by ferrosilicon: at the beginning of the sixties, the rich slag melting rare earth ferrosilicon alloy of the rare earth obtained after the deferrization of poor iron ore blast furnace during packet header Yi Jin institute adopts, obtains successfully.Because the rare earth oxide in the rich slag of rare earth is 10% ~ 15%, grade increases than blast furnace slag, and technical indicator is greatly enhanced.
(3) the rich slag of reduction by ferrosilicon rare earth ore concentrate deferrization: for silicothermic process, improve rare earths material middle rare earth content, contribute to improving technic index.After the seventies, Baotou Iron and Steel Company can select tens thousand of tons of rare earth ore concentrates every year, and its grade REO (rare earth oxide) is 30% ~ 60%, wherein high-grade mining in wet separation, low-grade for the production of rare earth alloy, obviously there is raw material advantage.For this reason, packet header Institute of Metallurgical Technology completes " Baotou rare earth ore concentrate carbonating cold bound pellet; smelt low titanium rare earth ferrosilicon alloy technique through mineral hot furnace deferrization, electro-silicothermic process; successfully smelt RE (rare earth element general name) content higher than 30%; the low titanium rare earth ferrosilicon alloy that Ti content is less than 0.5%, uneasy powdering of product.But production technique is Shortcomings still, production line is long, and process procedure is complicated, and facility investment is large; Arc furnace smelting procedure rare-earth yield is less than 65%.
(4) ferrosilicon direct-reduction rare earth ore concentrate: this technique emphasis controls the behavior of phosphorus in smelting process and trend, optimize suitable slag system, under the condition effectively controlling metallurgical atmosphere in stove, be equipped with rational smelting system, successfully solve alloy causes efflorescence problem because of phosphorous height, meanwhile, rare-earth yield brings up to 75%, achieves good index.But technique is quite harsh to the component requirements of slag former lime, and the working of a furnace is wayward, now substantially do not adopt this method in the industrial production.
(5) reduction by ferrosilicon fluoro-carbon-cerium ore concentrate: since the eighties, China starts scale exploitation hamartite.Nanjing special alloy factory adopts hamartite smelting RE-Si alloy thereupon.Open new material system.The advantage of this raw material is rare-earth mineral is single hamartite, and substantially not containing monazite, radioactivity is low, and titanium content is low, usually uses the concentrate containing 30% ~ 50%REO to be raw material.Consider from process aspect, use this raw material ratio packet header mishmetal mine disaster degree little, quality product is improved, and can produce the rare earth ferrosilicon alloy of low titanium, low aluminium, low calcium.
Two, carbothermic method technique: at present, from global industry size, silicothermic process remains main production method.But, because carbothermy utilizes cheap ore and directly produce alloy in jumbo mineral hot furnace, greatly reduce product cost, and carbothermy can be carried through to the end reduction in stove, can realize the suitability for industrialized production without industrial residue in theory, its development prospect is better than silicothermic process.Carbothermy produces research and the industrialization work of rare earth ferrosilicon alloy, mainly concentrates on the U.S., USSR (Union of Soviet Socialist Republics) and China.
(1) carbothermic reduction rare-earth hydroxide produces CSF-10 rare earth alloy: 1969, cerous hydroxide is made pelletizing in Graham factory by Ford mining company of the U.S., with constitutive materials such as silica, broken steel disc, wood chip and coals, the smelting of rare earth ferrosilicon alloy is carried out in mineral hot furnace, obtained containing RE 15%, Si 36% ~ 40%, surplus is the rare earth ferrosilicon alloy of iron, and the yield of Re reaches 90% ~ 94%.The content restriction of alloy to calcium, aluminium is very low.This technique has started the history beginning of carbothermy, but in smelting process, have slag to generate, and alloy pulverization is serious.
(2) steel-making additive produced by carbothermic reduction hamartite: with silica, higher-grade hamartite and Strontium carbonate powder, barium carbonate, lime for raw material, use low grey fine coal, charcoal is reductive agent, smelt rare earth silicon strontium, barium, Ca-Fe alloy, for the treatment of Hi-Stren steel.This technique is smelted under the condition crossing theoretical carbon amounts 50%, inevitably causes furnace bottom dross and carbide to flow out from stove eye, bring the melting continuously cycle short, can not carry out the problems such as continuous industrial production, and platform gold in atmosphere efflorescence occurs.
(3) rare earth ferrosilicon alloy produced by carbothermic reduction rare earth oxide: by rare earth oxide agglomeration, enter stove and smelt, and entered research to the primitive reaction of smelting technology system, reduction process with silica, coke etc.But due to furnace bottom dross, cause process lasting time not long, adopt rare earth oxide to be raw material, cost is high, therefore does not apply in industrial production in addition.
(4) the rich slag melting rare earth ferrosilicon alloy of carbothermic reduction rare earth: during the units such as Nanjing iron alloy three factory, packet header Institute of Metallurgical Technology adopt, the rich slag of lean ore and the rich slag of rare earth ore concentrate have carried out rare earth ferrosilicon alloy type approval test in 1800kW mineral hot furnace.This method can save ferrosilicon, lime, saves a set of equipment and the manpower of two-step approach, is significant to the comprehensive utilization of baotite.But in process of the test, the SiC lump under electrode roots is not got rid of, and makes smelting cycle shorten, and alloy pulverization is serious, power consumption is high, rare-earth yield is low, is therefore forced to abort.
(5) carbothermic reduction lanthanum rich rare earth oxide compound smelts lanthanum base rare earth ferrosilicon alloy: the technique that iron ore Yongxing, Ebony Hill, Jiangxi ferroalloy works propose " single stage method smelts (lanthanum base) rare earth ferrosilicon alloy ", adopts lanthanum rich rare earth oxide compound to be that the lanthanum base rare earth ferrosilicon alloy of content of rare earth more than 24% produced by raw material in 1800kW mineral hot furnace.This technique rare-earth yield is on the low side, and best index is 80%, and adopts expensive rare earth oxide to be raw material, and cost is high.So far industrialization is not realized with this explained hereafter rare earth ferrosilicon alloy.
In a word, improve through years of researches, silicothermic process production technique is gradually improved, but the problem that it is ecological, waste residue and rare earth resources utilize the aspect such as low, very unbecoming with the requirement of the new period energy, environmental protection, encounter stern challenge.
Sichuan Rare Earth industrial reserves 2,090,000 tons (REO), year nearly 50,000 tons of produced quantity (50%REO meter), rare earth processing treatment divides wet method and pyrogenic process, wherein: wet processes treatment capacity accounts for 80%, high cerium mischmetal slag after wet processing is about 1.6-1.8 ten thousand tons/year, after pyrogenic process processing treatment rare-earth mineral with rare earth ferrosilicon alloy product application in casting, cast steel and steel industry, be that one can not replace product.Because high cerium mischmetal slag has compared with strongly-acid and superfine granularity (being less than 200 orders), during pyrometallurgical smelting rare earth ferrosilicon alloy, use cerium enrichment slag to there is technical difficulty, all can only use rare earth ore concentrate.
China is Iron and Steel Production big country, but is not power, and many hi-tech steel still want import.Cerium (Ce) in rare earth is important role in Iron and Steel Production high-tech product is produced, and Ce elements has extremely strong with oxygen with the avidity of sulphur, and its redox current potential is in (Ce
3+) and (Ce
+ 4) between, obviously can improve high-temperature steel and stainless anti-corrosion, anti-oxidant and curability, improve steel product quality, alternative imported steel.In addition, what rare earth element had remarkable effect to cast iron spheroidization of graphite is cerium in rare earth element.One is that the boiling point of cerium is all high than magnesium, when adding in molten iron, can not cause seething and splash of molten iron; Two is that cerium has the desulfating and deoxidation ability stronger than magnesium, and the melting point compound such as sulfuration rare earth, rare earth oxide of generation is high, good stability; Three is that nodularization interference element in cerium and molten iron also can form stable compound, and the nodulizing agent therefore containing cerium is stronger than the immunity from interference of magnesium nodulizer.But current high cerium alloy is all add with the form of metallic cerium, and its cost is higher, thus limits widespread use, therefore, is applied to material industry with the replacement metallic cerium of high cerium mischmetal ferrosilicon and there are wide market outlook.
Summary of the invention
The technical problem to be solved in the present invention is that the production cost of existing rare earth ferrosilicon alloy is high, alloy pulverization is serious, rare-earth yield is low.
The scheme that the present invention solves the problems of the technologies described above is to provide a kind of high cerium mischmetal ferro-silicon, and its composition is counted by mass percentage: RE is 29 ~ 31%, Si is 49 ~ 51%, Ca≤0.1%, Al≤0.5%, wherein Ce/RE >=85%, all the other are Fe.
Present invention also offers the production method of above-mentioned high cerium mischmetal ferro-silicon, comprise the following steps:
A, in high cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 6.5 ~ 7.5;
Add carbon dust and alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, silica, carbonaceous reducing agent entered together with above-mentioned rare earth pelletizing stove and smelt, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the high cerium mischmetal slag described in step a contains REO70 ~ 75%wt, and wherein CeO2/REO is 85 ~ 90%, and pH value is 6.5 ~ 6.8, silicate impurity ≯ 13%.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the carbon dust described in step b requires C > 75%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the alkaline adhesive described in step b is water glass and SILICA FUME, and the mass ratio of water glass and SILICA FUME is 1 ︰ 1; Wherein, containing silicon-dioxide (Si0 in described water glass
2)>=28%, modulus is 3.5 ± 0.3.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the mass ratio of depickling height cerium mischmetal slag, carbon dust, alkaline adhesive described in step b is 1 ︰ 0.25 ~ 0.28 ︰ 0.35 ~ 0.38.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, containing SiO in the silica described in step c
2> 98%wt, Al
2o
3< 0.5%wt and CaO < 0.2%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the carbonaceous reducing agent described in step c comprises C solid > 80%wt, ash content < 7%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the mass ratio that Gui Shi ︰ described in step c suppresses the rare earth Qiu Tuan ︰ carbonaceous reducing agent of system is 1 ︰ 0.66 ~ 0.70 ︰ 0.75 ~ 0.79.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the time entering stove smelting described in step c is 2.5 ~ 3 hours.
The present invention adopts carbothermic method, and the tailings-Fu cerium slag all using wet separation to produce replaces rare earth ore concentrate to produce the rare hisingerite alloy of high cerium, unit power consumption is only 8302kwh/t, rare earth yield reaches 95.3%, is much better than energy consumption index (8800kwh/t) and the rare earth yield index (90%) of existing colleague.In product, Ce/RE content comparatively uses rare earth ore concentrate to improve 40.72% simultaneously, and by present rare earth ore concentrate calculation of price, its manufacturing cost can reduce about 7000 yuan/ton, can alleviate rare earth ore concentrate in short supply simultaneously.Because cerium-rich rare earth slag fluorine content is lower, equipment corrosion weakens, and can improve the operating rate of equipment.The present invention adopts carbothermy to produce high cerium mischmetal ferrosilicon, to dust, waste gas by after environment protection treating, reach national environmental standard discharge, the annual silicon powder reclaimed can also create good economic benefit simultaneously, because smelting technology is just cooled equipment by recirculated water, there is not water pollutions, comparatively silicothermic process reduces about 1400 tons, slag; Low about the 500kwh/t that comparatively goes together falls in comprehensive energy consumption.Method provided by the invention has stopped the waste of the rare heavy rare earth elements such as europium, terbium, dysprosium on the other hand, achieve the balanced use of rare earth element, effectively improve rare earth resources utilization ratio in short supply, greatly developed recycling economy, and promote the progress of rare earth ferrosilicon production technology.
Accompanying drawing explanation
The process flow sheet of Fig. 1 high cerium mischmetal ferro-silicon production method provided by the invention.
Embodiment
The production method of high cerium mischmetal ferro-silicon, comprises the following steps:
A, in high cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 6.5 ~ 7.5;
Add carbon dust and alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, silica, carbonaceous reducing agent entered together with above-mentioned rare earth pelletizing stove and smelt, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the high cerium mischmetal slag described in step a contains REO70 ~ 75%wt, and wherein CeO2/REO is 85 ~ 90%, and pH value is 6.5 ~ 6.8, silicate impurity ≯ 13%.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the carbon dust described in step b requires C > 75%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the alkaline adhesive described in step b is water glass and SILICA FUME, and the mass ratio of water glass and SILICA FUME is 1 ︰ 1; Wherein, containing silicon-dioxide (Si0 in described water glass
2)>=28%, modulus is 3.5 ± 0.3.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the mass ratio of depickling height cerium mischmetal slag, carbon dust, alkaline adhesive described in step b is 1 ︰ 0.25 ~ 0.28 ︰ 0.35 ~ 0.38.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, containing SiO in the silica described in step c
2> 98%wt, Al
2o
3< 0.5%wt and CaO < 0.2%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the carbonaceous reducing agent described in step c comprises C solid > 80%wt, ash content < 7%wt.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, described in step c, the mass ratio of Gui Shi ︰ rare earth Qiu Tuan ︰ carbonaceous reducing agent is 1 ︰ 0.66 ~ 0.70 ︰ 0.75 ~ 0.79.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, the time entering stove smelting described in step c is 2.5 ~ 3 hours.
In the production method of above-mentioned high cerium mischmetal ferro-silicon, when entering stove smelting described in step c, first silica is paved, then rare earth pelletizing is layered on silica, then carbonaceous reducing agent is layered on rare earth pelletizing.Three kinds of raw materials can be made so evenly to smelt, and the working of a furnace and product composition are stablized, and production effect is good.
Embodiment 1
A, in 100kg height cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 6.8;
Add 25kg carbon dust and 35kg alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, 228kg silica, 171kg carbonaceous reducing agent are entered stove and smelt 2.5 hours together with above-mentioned rare earth pelletizing, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
The high cerium mischmetal ferro-silicon that the present embodiment obtains, its composition is counted by mass percentage: RE is 29%, Si is 49.5%, Ca is 0.09%, Al is 0.45%, and wherein Ce/RE is 85%, and all the other are Fe.
Embodiment 2
A, in 200kg height cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 7.5;
Add 56kg carbon dust and 76kg alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, 500kg silica, 397kg carbonaceous reducing agent are entered stove and smelt 3 hours together with above-mentioned rare earth pelletizing, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
The high cerium mischmetal ferro-silicon that the present embodiment obtains, its composition is counted by mass percentage: RE is 30.85%, Si is 50.5%, Ca is 0.1%, Al is 0.49%, and wherein Ce/RE is 87%, and all the other are Fe.
Embodiment 3
A, in 50kg height cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 7.2;
Add 13.25kg carbon dust and 18.25kg alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, 120kg silica, 92kg carbonaceous reducing agent are entered stove and smelt 3 hours together with above-mentioned rare earth pelletizing, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
The high cerium mischmetal ferro-silicon that the present embodiment obtains, its composition is counted by mass percentage: RE is 30.98%, Si is 50.95%, Ca is 0.09%, Al is 0.48%, and wherein Ce/RE is 87.4%, and all the other are Fe.
Embodiment 4 the present invention and existing production technology contrast
Existing silicothermic process operation steps: silicothermic process smelts fractional melting phase and refining period, melting period adopts high-voltage level, after adding 1/4 compound (lime, steel scrap and 3/5 ferrosilicon), disposable whole rare earth ore concentrate is added electric arc furnace, more progressively add all the other 3/4 compounds.Time melting period is 1 hours, and refining period uses high-voltage level, is progressively added by residue 2/5 ferrosilicon, refining time 45 minutes; 1 hour 45 minutes whole tap to tap time.Ratio of components is: rare earth ore concentrate 1000 kilograms/batch, ferrosilicon 700 kilograms/batch, 1000 kilograms, lime/batch, steel scrap 20 kilograms/batch (reference: the practice of mineral hot furnace and electric arc furnace smelting rare earth ferrosilicon. rare earth 2006 (4)).
Existing carbothermy operation steps: when producing rare earth ferrosilicon alloy with about REO70% rare earth ore concentrate, first use 100 kilograms of rare earth ore concentrates, add 26 kilograms of carbon dusts, 33 kilograms of alkaline adhesives add in stirrer and stir, and stir after 15 minutes and add pressure ball mechanism ball, then by 100 kilograms, silica/batch, rare earth pelletizing 68/ batch kilogram, carbonaceous reducing agent 75 kilograms/batch stoichiometry after mix, progressively add in mineral hot furnace and smelt, smelted product through 2.5-3 hour.
Table 1 the present invention and existing production technology contrast
The present invention all uses the tailings-Fu cerium slag of wet production to replace rare earth ore concentrate to produce the rare hisingerite alloy of high cerium, unit power consumption is only 8302kwh/t, rare earth yield reaches 95.3%, be much better than energy consumption index (8800kwh/t) and the rare earth yield index (90%) of existing colleague, in product, Ce/RE content comparatively uses rare earth ore concentrate to improve 40.72 (by 47 to 87.72) simultaneously, by present rare earth ore concentrate calculation of price, manufacturing cost can reduce about 7000 yuan/ton, greatly reduces production cost.
Claims (10)
1. high cerium mischmetal ferro-silicon, its composition is counted by mass percentage: RE is 29 ~ 31%, Si is 49 ~ 51%, Ca≤0.1%, Al≤0.5%, and all the other are Fe, wherein Ce/RE >=85%.
2. the production method of high cerium mischmetal ferro-silicon described in claim 1, comprises the following steps:
A, in high cerium mischmetal slag, add water glass, make high cerium mischmetal slag depickling to pH value be 6.5 ~ 7.5;
Add carbon dust and alkaline adhesive in b, high cerium mischmetal slag after depickling, be pressed into rare earth pelletizing;
C, silica, carbonaceous reducing agent entered together with above-mentioned rare earth pelletizing stove and smelt, come out of the stove and burn casting, obtain high cerium mischmetal ferro-silicon.
3. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: the high cerium mischmetal slag described in step a contains REO70 ~ 75%wt, wherein CeO
2/ REO is 85 ~ 90%, and pH value is 6.5 ~ 6.8, silicate impurity ≯ 13%.
4. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: the carbon dust described in step b requires C > 75%wt.
5. the production method of high cerium mischmetal ferro-silicon according to claim 2, it is characterized in that: the alkaline adhesive described in step b is water glass and SILICA FUME, the mass ratio of water glass and SILICA FUME is 1 ︰ 1; Wherein, containing silicon-dioxide (Si0 in described water glass
2)>=28%, modulus is 3.5 ± 0.3.
6. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: the mass ratio of depickling height cerium mischmetal slag, carbon dust, alkaline adhesive described in step b is 1 ︰ 0.25 ~ 0.28 ︰ 0.35 ~ 0.38.
7. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: containing SiO in the silica described in step c
2> 98%wt, Al
2o
3< 0.5%wt and CaO < 0.2%wt.
8. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: the carbonaceous reducing agent described in step c comprises C solid > 80%wt, ash content < 7%wt.
9. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: the mass ratio that Gui Shi ︰ described in step c suppresses the rare earth Qiu Tuan ︰ carbonaceous reducing agent of system is 1 ︰ 0.66 ~ 0.70 ︰ 0.75 ~ 0.79.
10. the production method of high cerium mischmetal ferro-silicon according to claim 2, is characterized in that: entering the time that stove smelts described in step c is 2.5 ~ 3 hours.
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| CN108456773A (en) * | 2018-05-03 | 2018-08-28 | 包头市华商稀土合金有限公司 | A method of producing rare earth ferrosilicon alloy |
| CN108546835A (en) * | 2018-04-27 | 2018-09-18 | 乌拉特前旗三才第铁合金有限公司 | A kind of method of carbothermy technique serialization production high-quality rare earth ferrosilicon alloy |
| CN108611543A (en) * | 2018-05-12 | 2018-10-02 | 包头市华商稀土合金有限公司 | A method of producing rare earth magnesium ferrosilicon alloy based on comprehensive utilization of resources means |
| CN110093519A (en) * | 2019-05-06 | 2019-08-06 | 攀枝花学院 | A method of rare earth metal is prepared using rotary hearth furnace |
| CN110964931A (en) * | 2019-12-31 | 2020-04-07 | 乌拉特前旗三才第一铁合金有限公司 | Method for producing light rare earth composite heavy rare earth silicon iron alloy |
| CN113897485A (en) * | 2021-09-30 | 2022-01-07 | 包头稀土研究院 | Method for enriching scandium from niobium-titanium ore and application of silicon slag |
| CN115637339A (en) * | 2022-08-25 | 2023-01-24 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
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| CN106834587A (en) * | 2017-03-15 | 2017-06-13 | 北京安康科创节能环保科技有限公司 | A kind of method that rotary hearth furnace separates production rare earth ferrosilicon alloy |
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| CN108456773A (en) * | 2018-05-03 | 2018-08-28 | 包头市华商稀土合金有限公司 | A method of producing rare earth ferrosilicon alloy |
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| CN110093519A (en) * | 2019-05-06 | 2019-08-06 | 攀枝花学院 | A method of rare earth metal is prepared using rotary hearth furnace |
| CN110093519B (en) * | 2019-05-06 | 2021-04-27 | 攀枝花学院 | Method for preparing rare earth metal by using rotary hearth furnace |
| CN110964931A (en) * | 2019-12-31 | 2020-04-07 | 乌拉特前旗三才第一铁合金有限公司 | Method for producing light rare earth composite heavy rare earth silicon iron alloy |
| CN113897485A (en) * | 2021-09-30 | 2022-01-07 | 包头稀土研究院 | Method for enriching scandium from niobium-titanium ore and application of silicon slag |
| CN115637339A (en) * | 2022-08-25 | 2023-01-24 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
| CN115637339B (en) * | 2022-08-25 | 2023-12-01 | 华卫国 | Production process for extracting phosphorus product and rare earth product from monazite rare earth ore |
| CN116426773A (en) * | 2023-04-28 | 2023-07-14 | 东北大学 | Method for producing rare earth ferrosilicon alloy by using rare earth slag |
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