CN102061358B - Desulfuration refining process of high-sulfur crude ferronickel - Google Patents
Desulfuration refining process of high-sulfur crude ferronickel Download PDFInfo
- Publication number
- CN102061358B CN102061358B CN2011100093055A CN201110009305A CN102061358B CN 102061358 B CN102061358 B CN 102061358B CN 2011100093055 A CN2011100093055 A CN 2011100093055A CN 201110009305 A CN201110009305 A CN 201110009305A CN 102061358 B CN102061358 B CN 102061358B
- Authority
- CN
- China
- Prior art keywords
- melt
- nickel iron
- high sulfur
- ferronickel
- refining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a desulfuration refining process of high-sulfur crude ferronickel. The desulfuration refining process comprises the following steps of: (1) providing a fusant of the high-sulfur crude ferronickel with an initial temperature of more than 145 DEG C; (2) adding a composite desulfurizer to the fusant and introducing a high pressure gas from the bottom for stirring; (3) detecting sulfur content of the fusant, stopping desulfurating when the sulfur content of the fusant is below a predetermined value, detecting the temperature of the fusant when the sulfur content of the fusant is above the predetermined value, slagging off, raising the temperature of the fusant and repeating the step (2) until the sulfur content is below the predetermined value when the temperature is below 1350 DEG C, repeating the step (2) until the sulfur content is below the predetermined value when the temperature is above 1350 DEG C, and slagging off to obtain a refined ferronickel alloy fusant; and (4) casting and cooling the refined ferronickel alloy fusant and demoulding to obtain a refined ferronickel alloy. The desulfuration refining process of the high-sulfur crude ferronickel, which is disclosed by the embodiment of the invention, can be used for removing high-content sulfur with low energy consumption.
Description
Technical field
The present invention relates to the metallurgical production technical field, particularly a kind of desulfurizing and refining technology of high sulfur coarse nickel iron.
Background technology
As everyone knows; Nickel is alloying element important in the metallurgy industry; Because the nickel metal has particular performances; All have very widely and use producing stainless steel, Special Alloy Steel and be applied to various fields such as nickel plating, ceramic, cell catalyst, nickel alloy material all occupies crucial status in the development of the national economy and national defense and military construction.
Along with the widespread use of global stainless steel and special steel, cause the main element-nickel metal short supply of metallurgical stainless steel and special steel, cause that price skyrockets.At present, the nickel product is from sulphide ores more than 60% in the world, and all being present in the red soil nickel ore more than 60% of world's nickel resources.Handle the ferronickel that red soil nickel ore obtains with blast furnace or electric furnace reduction melting, be used to produce stainless steel through the substitute that both can be used as electrolytic nickel after the refining.
Smelt in the ferronickel that red soil nickel ore obtains at blast furnace or electric furnace reduction, contain impurity such as sulphur, phosphorus, carbon, silicon.Generally in the nickel iron refining that at present domestic and international large-scale nickel-iron smelting factory adopts adopt electric furnace process (LF stove), paddling process (similar KR method) desulfurization.Generally speaking; Carry out the technology that desulfurization is adopted for ferronickel; When sulphur content is not high, adopt the KR method more; When sulphur content is higher, then adopt electric furnace process more, this be since when sulphur content is higher through a large amount of heat of existing doctor treatment needs consumption in sweetening process, and electric furnace can replenish heat energy effectively.
Wherein the electric furnace process desulfurization has the stable and high advantage of desulfuration efficiency of use characteristics, but needs replenish the heat that loses in the sweetening process by electric energy fully, so energy consumption is higher.
Paddling process/KR method also has good desulfurization dynamic conditions, is adopted by several large-scale smelteries at present.But the desulfurization of KR method not only causes the first mate of temperature to reduce, and also needs follow-up desiliconization, dephosphorization equipment, so energy consumption is higher, technical process is longer.
Application number is the method that discloses a kind of high sulfur coarse nickel iron desulfurization in 200810058796.0 the patented claim, in medium-frequency induction furnace, in the fusion high sulfur coarse nickel iron, adds by the sweetening agent soda ash of thick ferronickel quality 3-10% or/and CaO and by the flux CaF of thick ferronickel quality 0-2%
2, in temperature be under 1330-1630 ℃ the condition through induction stirring, sulphur and soda ash or CaO in the thick ferronickel are reacted and slag making, take off slagging-off after refining 5-20 minute.Yet this technology also belongs to electric furnace desulfurization scope, and needs tank switching, so energy consumption is bigger.
Summary of the invention
The object of the invention is intended to solve at least one of above-mentioned technological deficiency, particularly proposes a kind ofly can remove the desulfurizing and refining technology that high-load sulphur can reduce the high sulfur coarse nickel iron of power consumption again.
In order to achieve the above object, one aspect of the present invention has proposed a kind of desulfurizing and refining technology of high sulfur coarse nickel iron, may further comprise the steps: 1) initial temperature is provided is the melt of the high sulfur coarse nickel iron more than 1450 ℃; 2) in the melt of said high sulfur coarse nickel iron, adding composite desulfurizing agent stirs with desulfurization and by bottom feeding high pressure gas; 3) sulphur content of the said melt of detection; When the weight content of the sulphur content of said melt is 0.03% to stop desulfurization when following;, the weight content of the sulphur content of said melt detects the temperature of said melt when being higher than 0.03%; When temperature is to skim below 1350 ℃ the time and make the said melt back repeating step 2 that heats up) until the weight content of sulphur content be 0.03% when following till; When temperature is a repeating step 2 more than 1350 ℃ the time) until the weight content of sulphur content be 0.03% when following till, obtain Rhometal melt after the refining after skimming; And 4) Rhometal melt after the refining is cast and cooling and demolding, obtain refining Rhometal.
The desulfurizing and refining technology of high sulfur coarse nickel iron according to the above embodiment of the present invention can realize the desulfurizing and refining of high sulfur coarse nickel iron efficiently, and power consumption is little, technology simple, the adjusting process step to be to adapt to the refining of the thick ferronickel of different sulphur content simply.And can carry out desulfurizing and refining up to the thick ferronickel more than 0.58% to the ferronickel sulphur content, handle the back sulphur content and reach below 0.02%, satisfy stainless steel plant's standard.
In addition, the desulfurizing and refining technology of the high sulfur coarse nickel iron of the above embodiment of the present invention can also have following additional technical feature:
According to one embodiment of present invention, the melt of said high sulfur coarse nickel iron is the melt of the high sulfur coarse nickel iron that obtained by electrosmelting.Thus, can reduce the process of tank switching, shorten the running time, reduce thermal losses.
According to one embodiment of present invention, the sulphur content of said high sulfur coarse nickel iron is more than the 0.25wt%.
According to one embodiment of present invention, contain the CaO (being also referred to as quickened lime in this manual sometimes) of 82wt%～92wt%, the CaF of 2wt%～10wt% in the said composite desulfurizing agent
2The CaCO of (being also referred to as fluorite in this manual sometimes) and 3wt%～7wt%
3(being also referred to as Wingdale in this manual sometimes).Lower, the convenient transportation of employed composite desulfurizing agent cost.
According to one embodiment of present invention, also contain the Al powder (being also referred to as aluminium powder in this manual sometimes) of 1～10wt% and/or the C powder (being also referred to as carbon dust in this manual sometimes) of 1～10wt% in the said slag former.
According to one embodiment of present invention, the particle diameter of said composite desulfurizing agent is below the 75 μ m.
According to one embodiment of present invention, said composite desulfurizing agent is that the mode that carrier passes through the top winding-up adds with the pressurized gas.
According to one embodiment of present invention, said melt being heated up realizes through aerating oxygen in said melt and Al powder.Thus, can solve the temperature drop problem in the sweetening process, thereby after guaranteeing refining, need not to use electric furnace etc. that heat energy is compensated in the quality of product.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or recognize through practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously with easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the synoptic diagram of the employed nickel iron refining of the desulfurizing and refining technology system of high sulfur coarse nickel iron according to an embodiment of the invention;
Fig. 2 is the schematic flow sheet of the desulfurizing and refining technology of high sulfur coarse nickel iron according to an embodiment of the invention;
Fig. 3 is the schematic flow sheet of the desulfurizing and refining technology of high sulfur coarse nickel iron in accordance with another embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the desulfurizing and refining technology of high sulfur coarse nickel iron in accordance with another embodiment of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
Disclosing of hereinafter provides many various embodiment or example to be used for realizing different structure of the present invention.In addition, various specific technology and the examples of material that the invention provides, but those of ordinary skills can recognize the use of the applicability and/or the other materials of other technologies.
I) nickel iron refining system
At first, describe with reference to the employed nickel iron refining of the desulfurizing and refining technology system of 1 pair of high sulfur coarse nickel iron of the present invention of accompanying drawing.
As shown in Figure 1, comprise ferronickel jar 1, melt feeding device (not shown), ferronickel jar running gear 2, cleaner adding set 9, top oxygen blowing device 7, bottom blowing device 12, temperature-detecting device, sampling unit and the device 11 of skimming according to the nickel iron refining system of the embodiment of the invention.
Particularly, said ferronickel jar 1 top is provided with opening and the bottom is provided with bottom gas entrance (not shown).
Said melt feeding device links to each other with the opening of said ferronickel jar 1 and is used for the thick ferronickel melt of fused is added said ferronickel jar 1.
Said ferronickel jar 1 is set to move and the said ferronickel jar 1 that tilts on said ferronickel jar running gear 2.
Cleaner adding set 9 links to each other with the opening of said ferronickel jar 1 and is used in ferronickel jar 1, adding cleaner.
Top oxygen blowing device 7 comprises oxygen canister 7a and the lance 7b that is connected oxygen canister 7a below, and said lance 7b is inserted into from the said opening of ferronickel jar 1 and is used in the ferronickel jar 1 in the melt of ferronickel jar 1, spraying oxygen.
Bottom blowing device 12 links to each other in said ferronickel jar 1, to spray into gas from the bottom with the said bottom gas entrance of ferronickel jar 1.
The melt temperature that temperature-detecting device is used to detect in the ferronickel jar 1 carries out skimming after the desulfurization or continuing desulfurization operations with detection.
Thereby the melt sample that sampling unit is used to gather in the ferronickel jar carries out dephosphorization or intensification desulfurization operations to measure molten intravital foreign matter content detection.
The device 11 of skimming is used for after desulfurization He behind the dephosphorization, removing the slag above the melt in the ferronickel jar 1.
Thus, the character that can effectively utilize josephinite self removes high-load sulphur when reducing electric energy loss, and can in a reaction vessel, realize desulfurization and dephosphorization under to the situation of the strict demand of ferronickel foreign matter content satisfying Stainless Steel Production.In addition, this nickel iron refining system and existing system simplified in comparison equipment, reduced investment, also capable of reducing energy consumption simultaneously.And this nickel iron refining system can take corresponding removal of impurities measure according to the difference of thick ferronickel composition very flexibly.In addition, this nickel iron refining system can reduce the process of tank switching with the removal of impurities of in the ferronickel jar, directly jetting of the high sulfur coarse nickel iron of electric furnace output, shortens the running time, reduces thermal losses.
In addition, spill in the removal of impurities process in order to prevent melt, said nickel iron refining system can also comprise splash guard 3; And splash guard lifting device 31.Said splash guard lifting device 31 is connected with said splash guard 3 so that splash guard 3 is mobile between the second position of the first location of the opening that covers ferronickel jar 1 and the opening that leaves the ferronickel jar.
In the nickel iron refining system of some of them embodiment of the present invention, said nickel iron refining system can also comprise solid oxidizing agent adding set 8, and said solid oxidizing agent adding set 8 links to each other with said opening in order in ferronickel jar 1, to add iron protoxide.In a concrete example, said solid oxidizing agent adding set 8 is a vibration material feeding.Thus, can realize the dephosphorization etc. of ferronickel melt according to the composition of josephinite through solid oxidizing agent (for example iron protoxide is also referred to as FeO in this manual sometimes).Need to prove that solid oxidizing agent also can mix with cleaner and add through cleaner adding set 9, is a preferred implementation of the present invention and solid oxidizing agent adding set 8 and cleaner adding set 9 are provided with respectively.Because cleaner itself also has the slag making effect except being suitable for desulfurization; And solid oxidizing agent adding set 8 and cleaner adding set 9 are provided with respectively and can at first carry out utilizing identical cleaner in dephosphorization, to carry out slag making again after desulfurization, the desiliconization to the impurity content of ferronickel melt, so setting then need not the cleaner in the cleaner winding-up jar is changed and used same equipment can realize the impurity removing refining of the ferronickel melt of the different impurity contents of different batches neatly.
In some of them embodiment of the present invention in the employed nickel iron refining system; Said nickel iron refining system can also comprise aluminium powder adding set 14, the said aluminium powder adding set 14 interpolation aluminium powder to ferronickel jar 1 in that links to each other with said opening when being lower than preset temperature and molten intravital sulphur content and being higher than preset value with the melt temperature in the ferronickel jar.In a concrete example, said aluminium powder adding set 14 is a vibration material feeding.Thus, can make itself and oxygen generation oxidizing reaction through adding aluminium powder when needed according to melt temperature, thereby owing to this oxidizing reaction is that temperature reaction need not the temperature that heating installation can improve melt.
In some of them embodiment of the present invention in the employed nickel iron refining system, in order to prevent when adding aluminum oxide or iron protoxide powder etc., to cause that powder disperses, said nickel iron refining system can also comprise the dust gathering arrester 4 that is arranged on said splash guard 3 tops.
In the nickel iron refining system of some of them embodiment of the present invention, cleaner adding set 9 comprises cleaner hopper 9a, be connected the cleaner winding-up jar 9b of cleaner hopper 9a lower end and be connected the cleaner spray gun 9c of cleaner winding-up jar 9b lower end.Cleaner spray gun 9c is used for cleaner is sprayed into melt in the ferronickel jar in said opening is inserted into said ferronickel jar melt.Thus, through being that carrier joins cleaner in the ferronickel melt, increased the dispersiveness of cleaner in the ferronickel melt, thereby can when improving dust removal rate, improve impurity-eliminating effect with dried compressed air or nitrogen.Sealed valve, control wearable valve can be set to control the winding-up of cleaner before and after the cleaner winding-up jar 9b.
In the nickel iron refining system of some of them embodiment of the present invention, be provided with the screen cloth that the fineness of said cleaner is controlled in the cleaner hopper 9a, such as 200 orders (being that particle diameter is less than 75 μ m) or thinner screen cloth.Thus, help the dispersion of cleaner in melt, can improve speed of response simultaneously.
In the nickel iron refining system of some of them embodiment of the present invention, the cleaner adding set also comprises fluidizator (not shown), and said fluidizator is arranged between cleaner hopper 9a and the cleaner winding-up jar 9b so that said cleaner fluidization.Thus, make said cleaner be more convenient for carrying.
In addition, said nickel iron refining system can also comprise waste residue recycling and processing device 13, said waste residue recycling and processing device 13 with said ferronickel jar 1 adjacent setting so that reclaim and handle the slag that is removed by the said device 11 of skimming.Thus, through the slag that removed of recycling, thus various compositions to containing in the slag as required, for example Ca, Al, S, P, Si etc. utilize again.
Preferably, temperature-detecting device and sampling unit are integrated into one and become thermometric sampling unit 10.Can make more compact of nickel iron refining system like this, operability is stronger.
II) nickel iron refining technology
Below, with reference to figure 2～Fig. 4 the sulfur removal technology that the nickel iron refining system that uses Fig. 1 carries out nickel iron refining is described.
Embodiment 1
The desulfurizing and refining technology of describing according to the high sulfur coarse nickel iron of the embodiment of the invention 1 with reference to figure 2 below.
Be in reducing atmosphere from the thick ferronickel melt of electrosmelting gained, be fit to carry out desulfurization and handle.Particularly, said sulfur removal technology step is following.
Step 1: at first, it is the melt of the high sulfur coarse nickel iron more than 1450 ℃ that initial temperature is provided.Particularly; Can use the melt of the thick ferronickel of Combustion in High Temperature High Sulfur that electrosmelting obtains; With the initial temperature of electrosmelting gained is that thick ferronickel melt is poured in the ferronickel jar 1 through melt feeding device (not shown) more than 1450 ℃, and the ferronickel jar 1 that after this through ferronickel jar running gear 2 thick ferronickel melt will be housed moves to the refining station.Can directly carry out refining thus, thereby save link such as heat the pyritous high sulfur coarse nickel iron, can energy efficient.
Step 2: after this, above ferronickel jar 1, installing splash guard 3 and dust gathering arrester 4 successively additional, and the cleaner spray gun 9b of cleaner adding set 9 is inserted into predetermined depth in the melt, is that carrier adds in melt and contains CaO, CaCO with the pressurized gas
3, CaF
2Composite desulfurizing agent to carry out desulfurization.In ferronickel jar 1, feeding high pressure gas through bottom blowing device 12 simultaneously stirs.Particularly, said high pressure gas can be compressed nitrogens or such as rare gas elementes such as argon gas.Because native system is provided with bottom blowing device 12, can overcome therefore that traditional electric furnace can't stir and problem such as speed of response is slow, reaction efficiency is low.
Step 3: the sulphur content through 10 pairs of said melts of thermometric sampling unit detects termly in desulfurization; When sulphur content is that preset value stops refining when following; When sulphur content is higher than preset value, then continues stirring desulphurization or skimming, heating up the continued stirring desulphurization till sulphur content reaches product requirement, obtain Rhometal melt after the refining after skimming according to melt temperature is different.
Particularly; When temperature is (for example 1350 ℃ of preset temperatures; Preferred 1400 ℃) stop refining when following and skim; And after skimming, in melt, add aluminium powder through aluminium powder adding set 14, and in melt, jet oxygen so that melt heats up through lance 7, after this proceed stirring, desulfurization.Said skimming removed splash guard 3 through splash guard lifting gear 31 particularly; The angle of utilizing ferronickel jar running gear 2 to make ferronickel jar 1 tilt to be scheduled to; And skim through the device 11 of skimming, the slag that removes recycles through waste residue recycling and processing device 13., temperature continues stirring, desulfurization when being higher than preset temperature (for example 1350 ℃, preferred 1400 ℃).
Step 4: Rhometal melt after the refining of step 3 gained is cast and cooled off demoulding, obtain refining Rhometal.
The sulfur removal technology of high sulfur coarse nickel iron according to the above embodiment of the present invention; Because composite desulfurizing agent progressively adds in batches, thereby therefore can not take place to cause the melt temperature rapid drawdown to cause the problem of the slow of desulphurization reaction or stagnation owing to a large amount of addings of sweetening agent.Thus, the desulfurizing and refining technology of the high sulfur coarse nickel iron of the embodiment of the invention can remove high-load sulphur with less energy-consumption.
According to a preferred implementation of the present invention, contain the CaO of 82wt%～92wt%, the CaF of 2wt%～10wt% in the said composite desulfurizing agent
2And the CaCO of 3wt%～7wt%
3
In above-mentioned sweetening process, relate to reactions:
2S+2CaO＝2CaS+O
2 (1)
Si+O
2＝SiO
2 (2)
CaO+SiO
2＝CaSiO
3 (3)
Because the CaS that reaction (1) is generated will directly get in the slag.And can know through reaction formula (2), be under the situation of composite desulfurizing agent of staple with CaO adding of the present invention, in desulfurization, can also remove silicon.
Because the SiO that the impurity Si that is contained in CaO and the thick ferronickel forms through oxidation
2Generate CaSiO through above-mentioned reaction formula (3) reaction
3, and the CaSiO that is generated
3For film like and be wrapped in the surface of CaO, therefore influenced further desulfurization.Given this, through low-melting CaF
2, can destroy CaSiO
3Film.And on the other hand, add a certain amount of CaCO
3Then can pass through the flowability that reactions (4) improves melt, improve sweetening effectiveness.
CaCO
3＝CaO+CO
2 (4)
And, can also contain Al and/or carbon dust in the composite desulfurizing agent according to a preferred implementation of the present invention.In the case, reactions will take place:
2Al+3O
2＝Al
2O
3 (5)
2C+O
2＝2CO (6)
2CO+O
2＝2CO
2 (7)
Reaction (5), (7) can increase the flowability of melt on the one hand, thereby can compensate the caused calorific loss because cold burden is jetted because above-mentioned reaction is thermopositive reaction on the one hand.
Except above-mentioned reaction, also carry out reactions in the melt:
2[P]+5[O]＝(P
2O
5) (8)
(P
2O
5)+4CaO＝4CaO·P
2O
5 (9)
Therefore, in desulfurization, its phosphorus content also decreases.
According to a preferred implementation of the present invention, wherein, the fineness of said composite desulfurizing agent is below 200 orders.Through fineness being controlled at below 200 orders, can promote carrying out fast of desulphurization reaction.
In addition, the composite desulfurizing agent among the present invention can be carrier with the pressurized gas, and the mode of jetting through the top adds.
In sweetening process, because therefore cold burden winding-up and the bottom aeration-agitation heat radiation in the winding-up process can cause the loss of heat.Above-mentioned reaction (2) is thermopositive reaction, when silicon content is higher than 2wt%, can compensate the cold burden caused calorific loss of jetting.And when the not enough 2wt% of silicone content in the ferronickel, need to solve the temperature drop problem through other intensification means.Drop to preset value (for example 1350 ℃, preferred 1400 ℃) when following in temperature, need stop desulfurization and further heat up in the back of skimming, the assurance refinery practice carries out smoothly when improving desulphurization reaction speed with reaction efficiency.According to a preferred implementation of the present invention, can aerating oxygen or aluminium powder make its oxidizing reaction that for example above-mentioned (2), (5), (7) take place to realize said intensification.
According to present embodiment, the sulphur content of handled high sulfur coarse nickel iron can reach more than the 0.25wt%, even can to handle sulphur content be the above high sulfur coarse nickel iron of 0.58wt%.
Particularly, in an example of the present invention, contain impurity and content (weight content) thereof in the handled thick ferronickel sample as follows:
| S | Si | P | C | Cr |
| 0.50％ | 0.4％ | 0.1％ | 1.9％ | 0.2％ |
Through behind the desulfurizing and refining, the foreign matter content (weight content) in the gained purified Rhometal as follows:
| S | Si | P | C | Cr |
| 0.03％ | 0.02％ | 0.015％ | 0.03％ | 0.1％ |
The desulfurizing and refining technology of describing according to the high sulfur coarse nickel iron of the embodiment of the invention 2 with reference to figure 3 below.
The key distinction of present embodiment and the foregoing description 1 is, the particular case of the phosphorus content that is contained according to the thick ferronickel of raw material behind desulfurizing and refining, has further also been carried out dephosphorization to the phosphorus impurities that is wherein contained.
Particularly, at first, to carry out desulfurization with embodiment 1 identical mode.Reach in sulphur content under the situation of product requirement, further add compound dephosphorization agent in the melt after desulfurization and carry out dephosphorization.
Because some is removed through reaction formula (8), (9) its contained phosphorus in sweetening process, in ensuing dephosphorizing process, except CaO, CaCO
3, CaF
2Outside also further add the iron protoxide skin.Wherein, said CaO, CaCO
3, CaF
2Deng the effect of playing slag making.In dephosphorizing process, following reaction, also takes place except taking place in (8), (9) reaction:
2P+5FeO+4CaO＝4CaO·P
2O
5+5Fe (10)
In the present embodiment, contain impurity in the handled thick ferronickel sample and content is following:
| S | Si | P | C | Cr |
| 0.50％ | 0.4％ | 0.1％ | 1.9％ | 0.2％ |
After desulfurization and dephosphorization refining, the foreign matter content in the gained purified Rhometal is following:
| S | Si | P | C | Cr |
| 0.03％ | 0.02％ | 0.015％ | 0.03％ | 0.1％ |
Hence one can see that, and nickel iron refining technology according to the above embodiment of the present invention can be reduced to the sulfur impurity in the ferronickel, phosphorus, carbon, silicon etc. and satisfy the desired level of refining ferronickel product.
The desulfurizing and refining technology of describing according to the high sulfur coarse nickel iron of the embodiment of the invention 3 with reference to figure 4 below.The key distinction of present embodiment and embodiment 2 is that the raw material that it adopted is that red soil nickel ore is through the thick ferronickel of sintering with thick refining gained.
Particularly, at first, be that 90: 10～95: 5 ratio is mixed according to weight ratio with red soil nickel ore and coal dust or coke powder, after this utilize rotary kiln 600～1000 ℃ of following sintering 2～8 hours, obtain the sintering nickel minerals.After this said sintering nickel minerals, flux and reductive agent are put into electric furnace and under 200V～300V, smelted 1～3 hour, obtain thick ferronickel.Then, pour the high sulfur coarse nickel iron of electric furnace output into the ferronickel jar, and according to carrying out refining with embodiment 2 identical modes, thereby the refining ferronickel obtained.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained at least one embodiment of the present invention or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described embodiments of the invention; For those of ordinary skill in the art; Be appreciated that under the situation that does not break away from principle of the present invention and spirit and can carry out multiple variation, modification, replacement and modification that scope of the present invention is accompanying claims and be equal to and limit to these embodiment.
Claims (8)
1. the desulfurizing and refining technology of a high sulfur coarse nickel iron is characterized in that, may further comprise the steps:
1) initial temperature being provided is the melt of the high sulfur coarse nickel iron more than 1450 ℃;
2) in the melt of said high sulfur coarse nickel iron, adding composite desulfurizing agent stirs with desulfurization and by bottom feeding high pressure gas;
3) sulphur content of the said melt of detection,
When the weight content of the sulphur content of said melt is 0.03% to stop desulfurization when following,
, the weight content of the sulphur content of said melt detects the temperature of said melt when being higher than 0.03%,
When temperature is to skim below 1350 ℃ the time and make the said melt back repeating step 2 that heats up) until the weight content of sulphur content be below 0.03% till,
Repeating step 2 when temperature is higher than 1350 ℃) until the weight content of sulphur content be below 0.03% till, obtain refining Rhometal melt after skimming; And
4) Rhometal melt after the refining is cast and cooling and demolding, obtain refining Rhometal.
2. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, the melt of said high sulfur coarse nickel iron is the melt of the high sulfur coarse nickel iron that obtained by electrosmelting.
3. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, the sulphur content of said high sulfur coarse nickel iron is more than the 0.25wt%.
4. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, contains the CaO of 82wt%～92wt%, the CaF of 2wt%～10wt% in the said composite desulfurizing agent
2And the CaCO of 3wt%～7wt%
3
5. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, said composite desulfurizing agent also contains the Al powder of 1～10wt% and/or the C powder of 1～10wt%.
6. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, the particle diameter of said composite desulfurizing agent is below the 75 μ m.
7. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, said composite desulfurizing agent is that the mode that carrier passes through to jet at the top adds with the pressurized gas.
8. the desulfurizing and refining technology of high sulfur coarse nickel iron as claimed in claim 1 is characterized in that, said melt is heated up realize through aerating oxygen in said melt and Al powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100093055A CN102061358B (en) | 2011-01-17 | 2011-01-17 | Desulfuration refining process of high-sulfur crude ferronickel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100093055A CN102061358B (en) | 2011-01-17 | 2011-01-17 | Desulfuration refining process of high-sulfur crude ferronickel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102061358A CN102061358A (en) | 2011-05-18 |
| CN102061358B true CN102061358B (en) | 2012-12-26 |
Family
ID=43996864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100093055A Active CN102061358B (en) | 2011-01-17 | 2011-01-17 | Desulfuration refining process of high-sulfur crude ferronickel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102061358B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198016A (en) * | 1990-11-05 | 1993-03-30 | Pechiney Electrometallurgie | Product for the desulphurization of molten pig iron or steel based on coated magnesium |
| CN101338353A (en) * | 2008-08-08 | 2009-01-07 | 昆明理工大学 | High sulfur coarse nickel iron refining desulphurization method |
| CN101386950A (en) * | 2008-10-17 | 2009-03-18 | 河北上大再生资源科技有限公司 | Nickel iron intermediate alloy and melting and purification treatment method thereof |
-
2011
- 2011-01-17 CN CN2011100093055A patent/CN102061358B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198016A (en) * | 1990-11-05 | 1993-03-30 | Pechiney Electrometallurgie | Product for the desulphurization of molten pig iron or steel based on coated magnesium |
| CN101338353A (en) * | 2008-08-08 | 2009-01-07 | 昆明理工大学 | High sulfur coarse nickel iron refining desulphurization method |
| CN101386950A (en) * | 2008-10-17 | 2009-03-18 | 河北上大再生资源科技有限公司 | Nickel iron intermediate alloy and melting and purification treatment method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102061358A (en) | 2011-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102094094B (en) | Process for smelting ferronickel from red soil nickel ore | |
| JPWO2002022891A1 (en) | Refining agent and refining method | |
| KR20000068375A (en) | Installation and method for producing molten metal | |
| CN104789718A (en) | Steel slag recycling method | |
| CN101838718A (en) | Medium frequency furnace internal dephosphorization and desulfurization smelting process | |
| CN102206729A (en) | Method for recycling steel slag of LF (Low Frequency) furnace | |
| CN102061357B (en) | Dephosphorization refining process for phosphorus-containing coarse ferronickel | |
| SK19172000A3 (en) | Method for processing steel slags | |
| CN111961785B (en) | Method for producing ultra-pure pig iron by iron bath smelting reduction method | |
| CN108774662A (en) | A kind of induction furnace and RH-OB duplex techniques | |
| CN103045793A (en) | Vacuum smelting device for converter and use method of vacuum smelting device | |
| CN105506226A (en) | Method for carrying out pre-desiliconization, pre-decarburization and pre-dephosphorization on molten iron in molten iron tank | |
| CN103643056B (en) | The smelting process of low carbon ferromanganese | |
| CN101403023A (en) | Ultra-deep desulfuration method for hot metal | |
| CN102747192A (en) | Method for smelting ultralow-sulfur steel | |
| CN102994688B (en) | Pretreatment technology of terminal steel slag in converter | |
| CN103643094B (en) | The smelting process of high carbon ferromanganese | |
| CN203080002U (en) | Converter vacuum smelting device | |
| EP2039788A1 (en) | Dephosphorization method in the process of smelting ni-cr pig iron from a nickel oxide ore | |
| CN202030814U (en) | Ferronickel refining system | |
| CN103074543A (en) | Manufacturing technology of steel containing molybdenum | |
| CN102108428B (en) | Refining process of crude nickel iron | |
| CN102061358B (en) | Desulfuration refining process of high-sulfur crude ferronickel | |
| CN101831525A (en) | Dephosphorization method for molten iron | |
| CN100540686C (en) | A kind of process for making |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |