CN105506271A - Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof - Google Patents
Chromium ore composite pellet used for reduction in argon-oxygen refining furnace, production method and application thereof Download PDFInfo
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Abstract
The invention provides a chromium ore composite pellet used for reduction in an argon-oxygen refining furnace, a production method and an application thereof. The chromium ore composite pellet includes the following components, by weight, 40-52% of chromium ore, 10-25% of metal manganese, 10-25% of silicon iron, 5-12% of metal calcium and 4-6% of a binder. Strong reduction agents, the metal manganese and the metal calcium, are added to the chromium ore composite pellet, so that dissolution of chromium ore is accelerated, desulfurization of slag is improved and yields of chromium and manganese in the chromium ore composite pellet are increased. The chromium ore composite pellet is added when oxygen blowing for decarbonization is finished in the argon-oxygen refining furnace, wherein the addition amount of the chromium ore pellets is accurately calculated through surplus heat of molten steel in the argon-oxygen refining furnace, so that peroxidation of the molten steel of stainless steel is effectively prevented. The yields of the chromium and manganese in the chromium ore composite pellet reach more than 90%. Consumption of reduced silicon iron is not influenced.
Description
Technical field
The present invention relates to a kind of supplementary material for ferrous metallurgy, be applied to the novel alloy material and production method thereof that carry out chromium alloying in stainless steel smelting process, be specifically related to a kind of argon oxygen decarburizing furnace reduction chrome ore composite pellet and production method thereof and application.
Background technology
Chromium (Cr) is element indispensable in stainless steel, is also topmost alloying element in stainless steel.At present in argon oxygen decarburizing furnace steelmaking process, carrying out chromium alloying material used is chromium system iron alloy, and this alloy smelts into containing ferrochrome by chrome ore, big for environment pollution in whole production process, energy consumption and production cost higher.Along with the development of steel-smelting technology, occur adopting chrome ore directly to carry out the smelting technology of alloying in converter and electric furnace.But problem is the chromium in chrome ore mainly to be existed with the form of picrochromite, chromohercynite, in liquid phase slag, fusing point is high, solubleness is very little, if use in argon oxygen decarburizing furnace steelmaking process, its reductive condition is larger by the impact of carbon, chromium content in stainless molten steel, carbon content is lower, chromium content is higher, and beginning reduction temperature is higher.Therefore, in whole argon oxygen decarburizing furnace smelting process, there is unstable feature (before reduction phase) in the recovery rate of chromium, result in the increase that reduction process ferrosilicon consumes, apply difficulty.
Chinese Patent Application No. is 201110280459.8, open " a kind of argon oxygen decarburizing furnace chromium manganese ore composite pellet and production method thereof ", this invention belongs to the process of melting class alloy, relate to argon oxygen decarburizing furnace chromium, manganese element alloying, be made up of following component and content by weight percentage: chrome ore 28 ~ 43%, manganese ore 11 ~ 22%, graphite 25 ~ 45%, ferrosilicon 5 ~ 10%, binding agent 5 ~ 7%.Be mainly used in chrome ore and manganese ore direct alloying technique in argon oxygen decarburizing furnace smelting process, there is certain desulfidation.But this invention is applicable to add in argon oxygen decarburizing furnace converting process, namely adding before the reduction of argon oxygen decarburizing furnace blowing technology, because the feature of chrome ore and manganese ore is that temperature drop is larger, argon oxygen decarburizing furnace enters the molten iron of stove or the condition difference of electric furnace mother liquor, cannot accurate calculation add-on, when add-on is excessive, easily cause beginning reduction temperature too low, (Cr in slag
2o
3) content rising, have influence on chromium recovery rate and sweetening effectiveness.Content of graphite 25 ~ 45% in this invention in addition, uses at argon oxygen decarburizing furnace reduction phase, molten steel can occur and seriously increase [C] phenomenon, therefore can not use when argon oxygen decarburizing furnace reduces.
China Patent Publication No. CN101343710 discloses " a kind of dust separation briquetting of stainless steel directly enters the method for stove application ".This invention belongs to the process of melting class alloy, produces in stainless steel and converter producing weathering steel for electric furnace.Be made up of following component and content by weight percentage: the iron filings 5 ~ 10% of dedusting ash of stainless steel 50 ~ 80%, aluminium powder 5 ~ 8%, mechanical workout, silicocalcium powder 6 ~ 13%, binding agent 1 ~ 3%, limestone powder 0 ~ 10%, fluorite 1 ~ 8%, briquetting.When dust separation briquetting of stainless steel being applied directly in the production of electrosmelting stainless steel, after melt portions molten steel, have a power failure, drop into the dust separation briquetting of stainless steel of the 18-21% of batching total amount in batches, then press the conventional smelting technology melting of electric furnace; Or when dust separation briquetting of stainless steel is applied directly in converter producing weathering steel, in smelting process, adds the stainless steel dedusting meeting briquetting of tap 2-5%, directly enter stove, reduce the add-on of ferrochrome, ferronickel, ferrophosphorus.But adding aluminium powder 5 ~ 8% in this invention, is the Al of stainless application of RE in the steel, generation 300
2o
3be mixed in molten steel and be difficult to remove, easily cause 300 to be stainless steel plate spiral squama defect; Converter in addition, the electric furnace quantity of slag are large, and finishing slag iron oxide content is high, and the silicocalcium powder added will be all oxidized, and the silicocalcium after oxidation cannot reduce the Cr in dedusting ash
2o
3, cause the chromium recovery rate in dedusting ash to be only about 50%.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of argon oxygen decarburizing furnace reduction chrome ore composite pellet and production method thereof and application.Described argon oxygen decarburizing furnace reduction chrome ore composite pellet adds strong reductant manganese metal and calcium metal, and accelerate chrome ore and dissolve, improve the sweetening power of slag, the chromium in chrome ore composite pellet, the recovery rate of manganese are higher; Apply chrome ore composite pellet of the present invention, described chrome ore composite pellet adds after argon oxygen decarburizing furnace oxygen decarburization terminates, utilize the heat that argon oxygen decarburizing furnace molten steel is more than needed, the add-on of accurate calculation chrome ore ball, effectively prevent stainless molten steel over-blowing peroxidation, the recovery rate of chrome ore composite pellet chromium, manganese can reach more than 90%, does not affect the consumption of reduction ferrosilicon.
Technical scheme of the present invention is as follows:
Chrome ore composite pellet is used in a kind of argon oxygen decarburizing furnace reduction, and it is characterized in that, the weight percentages of components of described chrome ore composite pellet is:
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described chrome ore weight percentages of components 48 ~ 51%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described manganese metal weight percentages of components 15 ~ 20%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described ferrosilicon weight percentages of components 15 ~ 21.5%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described calcium metal weight percentages of components 5.1 ~ 9.5%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described binder component weight percent 4.8 ~ 5.5%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, Cr in described chrome ore
2o
3mass percentage be 40.0 ~ 50.0%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, the mass percentage of described manganese metal is >=97.0%.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described ferrosilicon by raw coke, aluminium powder, steel cuttings and quartz or silica, the iron silicon alloy be prepared from electrosmelting.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, mass percentage >=72.0 ~ 80.0% of described Silicon in Ferrosilicon, mass percentage≤0.50% of carbon.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, described calcium metal, by Wingdale, aluminium powder, adopts vacuum reducing method to be prepared from through cooling post-treatment.
According to argon oxygen decarburizing furnace reduction chrome ore composite pellet of the present invention, preferably, the mass percentage of described calcium metal is >=97.0%.
The present invention also provides a kind of production method of described argon oxygen decarburizing furnace reduction chrome ore composite pellet, it is characterized in that, chromite ore fine is dried or dries to moisture content≤2.0%, the chromite ore fine of drying, manganese metal, ferrosilicon, calcium metal are ground to form fine powder respectively, mixing, then add binding agent and stir, be pressed into pelletizing, seasoning, sealing is preserved stand-by.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, preferably, the granularity of described fine powder is 0.09 ~ 0.2mm.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, preferably, the diameter of the pelletizing be pressed into described in is 20 ~ 50mm.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, the weight percentages of components of described chrome ore composite pellet is:
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, Cr in described chrome ore
2o
3mass percentage be 40.0 ~ 50.0%.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, the mass percentage of described manganese metal is >=97.0%.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, described ferrosilicon by raw coke, aluminium powder, steel cuttings and quartz or silica, the iron silicon alloy be prepared from electrosmelting.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, the mass percentage 72.0 ~ 80.0% of described Silicon in Ferrosilicon, mass percentage≤0.50% of carbon.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, described calcium metal, by Wingdale, aluminium powder, adopts vacuum reducing method to be prepared from through cooling post-treatment.
According to the production method of argon oxygen decarburizing furnace reduction chrome ore composite pellet provided by the invention, preferably, the mass percentage of described calcium metal is >=97.0%.
The present invention also provides the application of a kind of described argon oxygen decarburizing furnace reduction chrome ore composite pellet in argon oxygen decarburizing furnace STEELMAKING PRODUCTION, it is characterized in that, described chrome ore composite pellet joins molten bath when argon oxygen decarburizing furnace reduces, add described chrome ore composite pellet 5 ~ 20 kgs/tonne of steel, chrome ore composite pellet chromium can be made, the recovery rate of manganese reaches more than 90%.
The chrome ore composite pellet of argon oxygen decarburizing furnace reduction provided by the invention, adds, utilizes the feature of the high temperature of stainless steel molten steel after argon oxygen decarburizing furnace oxygen decarburization terminates, and strong reductant Pure Silicon Metal, the calcium in pelletizing, the chromium element in rapid reducing chrome ore ball.In pellet, manganese metal participates in (MnO) of reaction generation simultaneously, can reduce Cr in chrome ore
2o
3fusing point and promotionization slag, improve the desulfuration ability of slag.
Detailed Description Of The Invention:
A kind of argon oxygen decarburizing furnace stove chrome ore composite pellet, its weight percentages of components is:
Various materials described are further:
Chrome ore is: preferably, Cr in chrome ore
2o
3mass percentage be 40.0 ~ 50.0%;
Manganese metal is: preferably, and the mass percentage of manganese is >=97.0%;
Ferrosilicon is: be with coke, aluminium powder, steel cuttings, quartz (or silica) for raw material, the iron silicon alloy made with electrosmelting.Preferably, mass percentage >=72.0 ~ 80.0% of Silicon in Ferrosilicon, mass percentage≤0.50% of carbon;
Calcium metal is: be reductive agent with lime masonry raw material, aluminium powder, and adopt vacuum reducing method to obtain through cooling post-treatment, preferably, the mass percentage of calcium is >=97.0%;
Binding agent is: sodium carboxymethylcellulose pyce, and other binding agent easily causes molten steel recarburization.
Above-mentioned argon oxygen decarburizing furnace reduction chrome ore composite pellet can adopt following method to be prepared from, chromite ore fine is dried or dries to moisture content≤2.0%, the chromite ore fine of drying, manganese metal, ferrosilicon, calcium metal are ground to form the fine powder that granularity is 0.09 ~ 0.2mm respectively, mixing, add binding agent again to stir, be pressed into the pelletizing that diameter is 20 ~ 50mm, seasoning (can not toast), sealing is preserved.
The Main Function of various material in further described the present invention:
Chrome ore, wherein chromium element is the principal element of stainless steel product;
Manganese metal, manganese element is the one of the chief elements of stainless steel product, after allocating certain proportion into, can accelerate lime and dissolve, promotionization slag, improve the desulfuration ability of slag.
Ferrosilicon is strong heating element, is again stronger reductive agent simultaneously.
Calcium metal is strong reductor, has again stronger desulfuration ability simultaneously.
The present invention adopts the theoretical foundation of chrome ore, manganese metal, ferrosilicon and calcium metal as follows:
1) effect of chrome ore of the present invention
After utilizing argon oxygen decarburizing furnace decarburization to terminate and before reduction starts, stainless steel molten steel has the feature (molten steel temperature about 1700 DEG C) of high temperature, composite pellet is directly loaded in argon oxygen decarburizing furnace stove, in addition argon oxygen decarburizing furnace itself dynamic conditions preferably, the very fast melting of composite pellet, utilize the calcium metal in composite pellet, ferrosilicon and manganese metal by the part chromium element reduction in chrome ore out (see reaction equation 1,2,3), enter the object that molten steel reaches alloying.
In argon oxygen decarburizing furnace reduction process, adopt ferrosilicon to make reductive agent, the noble metal element Cr in reduced blast furnace, part has been formed the chromite ore fine (Cr of slag
2o
3), be reduced into chromium metal (see reaction equation 2).
By the reduction of above-mentioned two processes, the recovery rate of the chromium of chromite ore fine can reach more than 92%, and this method takes full advantage of cheap chromium powder ore resource, reduces production cost and smelts energy consumption.
(Cr
2o
3)+3 [Ca]=2 [Cr]+3CaO equations 1
2 (Cr
2o
3)+3 [Si]=4 [Cr]+3SiO
2equation 2
(Cr
2o
3)+3 [Mn]=2 [Cr]+3MnO equations 3
2) effect of manganese metal
Before starting with reduction after argon oxygen decarburizing furnace decarburization terminates, in molten bath, slag is solid-state shape.Along with adding of composite pellet, in conjunction with the argon oxygen decarburizing furnace dynamic conditions thermodynamic condition that the stage is good therewith preferably itself, the very fast melting of composite pellet, in pelletizing, a manganese metal part directly enters molten steel and plays alloying action, a part is reacted with the oxygen in molten steel and is generated MnO (see reaction equation 4), enter in slag, generate the tephroite of low melting point, fully reduce Ca
2siO
4, Ca
3siO
4phase region, thus change slag speed when can improve reduction phase, promotes picrochromite in chrome ore, chromohercynite fusing.
Simultaneously, the increase of (MnO) content in slag, the partition ratio of sulphur (S) can be improved, in slag, (Mn) increases, (O) content in steel is reduced, promote that desulphurization reaction carries out to positive dirction, therefore in slag, (MnO) content improves, and is conducive to argon oxygen decarburizing furnace slag desulfurization.
In argon oxygen decarburizing furnace reduction process, adopt ferrosilicon to make reductive agent, the noble metal element M n in reduced blast furnace, part has been formed (MnO) of slag, be reduced into manganese metal (see reaction equation 5).Through above-mentioned two processes, the recovery rate of the manganese of manganese metal can reach more than 90%.
[Mn]+[O]=MnO equation 4
2 (MnO)+[Si]=2 [Mn]+SiO
2equation 5
3) effect of ferrosilicon
After argon oxygen decarburizing furnace decarburization terminates, the carbon content in molten steel is very low, and the reduction relying on higher carbon concentration in molten steel to carry out chrome ore is not all right; Meanwhile, decarburization terminates in rear molten steel not containing the element that silicon, aluminium etc. are strong with affinity for oxygen; So the abundant reduction now only relying on the good dynamic conditions thermodynamic condition that the stage is good therewith of argon oxygen decarburizing furnace itself to carry out chrome ore is impossible, must additional reducing agent, namely need extra Pure Silicon Metal or other under this smelts environment, usually reduce (Cr than chromium and the strong unit of affinity for oxygen
2o
3).Therefore in actual production, chrome ore will add in stove by a certain percentage with ferrosilicon simultaneously, to promote that the DIRECT ALLOYING of steel is carried out smoothly.
4) effect of calcium metal
Calcium metal boiling point is about 1484 DEG C, easily vaporization phenomenon is there is at steel-making temperature, but after making pelletizing, due to the raising of bulk density, pelletizing directly will enter molten steel, when not and vaporization, directly react with molten steel, because the avidity of calcium metal and oxygen is greater than silicon, so facilitate Cr in pelletizing
2o
3reduction (see reaction equation 1), in addition, calcium metal also has strong sweetening power (see reaction equation 6).
[Ca]+[S]=CaS equation 6
5) requirement of chrome ore, manganese metal, ferrosilicon, calcium metal granularity
Chrome ore, manganese metal, ferrosilicon and calcium metal are all ground to form 0.09mm granularity pulvis, in laboratory conditions, reduction rate (d [the Cr]/dt/%.min of Cr in test chrome ore
-1: refer to that in minutes, chrome ore is converted into the reduction rate of molten steel [Cr]), 0.12mm, 0.13mm, 0.14mm, 0.20mm, 0.6mm, 1.0mm granularity pulvis is ground to form with by chrome ore, manganese metal, ferrosilicon and calcium metal, contrast, as seen from Figure 1, under the reduction temperature of 1580 DEG C, reducing material granularity is less, and reduction rate is larger, and size range is maximum at 0.09 ~ 0.2mm reduction rate.
The reduction rate of chrome ore is faster, chromium in chrome ore will enter molten steel as early as possible, due to the feature of argon oxygen decarburizing furnace, before starting with reduction after decarburization terminates, molten steel temperature is >=1680 DEG C, far above 1580 under laboratory condition DEG C, therefore adds in stove by composite pellet at this moment, being very favorable to accelerating the reduction rate of chrome ore, being specifically reflected in (see embodiment 9,10) in the recovery rate of chrome ore.
Due to suitability for industrialized production, chrome ore, manganese metal, ferrosilicon and calcium metal are made and be less than 0.09mm particle, all bring disadvantageous effect to production, cost, it is comparatively suitable that composite factor considers that chrome ore, manganese metal, ferrosilicon and calcium metal granularity are decided to be 0.09 ~ 0.2mm.
Chrome ore cooling intensity is comparatively large, and add in oxygen blast process, easily cause furnace heat defect, Molten Steel over-oxidation is serious.Use at argon oxygen decarburizing furnace reduction phase, argon oxygen decarburizing furnace decarburization is utilized to terminate the heat of having more than needed, add appropriate chrome ore composite pellet of the present invention (this invention pelletizing of 1kg/t.s, 2 DEG C can be lowered the temperature), chromium in pelletizing, manganese element can be improved in the recovery rate in sequential reduction stage, utilize the white slag refining principle of argon oxygen decarburizing furnace reduction process simultaneously, make chrome ore composite pellet chromium, the recovery rate of manganese reaches more than 90%, and do not affect the consumption of reduction ferrosilicon.Simultaneously because decarburization terminates, bath temperature relative constancy, now adding also can Accurate Estimation terminal temperature.
Beneficial effect of the present invention:
The invention provides a kind of argon oxygen decarburizing furnace reduction chrome ore composite pellet and production method thereof and application.It is crucial that described argon oxygen decarburizing furnace reduction chrome ore composite pellet adds manganese metal and calcium metal, accelerate chrome ore and dissolve, improve the sweetening power of slag.
The present invention reduces can Some substitute high price resource low carbon ferrochromium, extra low carbon ferrochromium with chrome ore ball, and cost advantage is obvious; Described chrome ore composite pellet joins molten bath after argon oxygen decarburizing furnace oxygen decarburization terminates, can the add-on of accurate calculation chrome ore ball, prevent Molten Steel over-oxidation, and make chrome ore composite pellet chromium, the recovery rate of manganese reaches more than 90%, do not affect the consumption of reduction ferrosilicon, and improve the sweetening power of slag.
Accompanying drawing explanation
Fig. 1 is the particle of chrome ore composite pellet moiety of the present invention and the relation of [Cr] reduction rate.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Add reduction chrome ore composite pellet of the present invention by furnace top bin before starting with reduction after argon oxygen decarburizing furnace decarburization terminates, utilize the strong mixing in stainless steel molten steel temperature and molten bath, pelletizing is melted as early as possible.
Embodiment composition is see table 1:
Table 1: each component proportion of reduction chrome ore composite pellet
Be on 120 tons of argon oxygen decarburizing furnaces at nominal capacity, add chrome ore composite pellet of the present invention 0.5 ~ 3.0 ton/stove, result of implementation shows (see table 2), owing to adding in reduction start time, chrome ore composite pellet needs certain fusing time, and smelting cycle slightly adds 1.1min/ stove; But (Cr in the consumption of reduction silicon, reduction [Cr] content, slag before and after implementing
2o
3) without obviously distinguishing; In chrome ore composite pellet, the recovery rate of chromium can reach 93.15%, 91.49% respectively, and with close during use ferrochrome, desulfurization degree can improve 1.3%.
Table 2: the effect after enforcement
The invention provides a kind of argon oxygen decarburizing furnace reduction chrome ore composite pellet and production method thereof and application.It is crucial that described argon oxygen decarburizing furnace reduction chrome ore composite pellet adds manganese metal and calcium metal, accelerate chrome ore and dissolve, improve the sweetening power of slag.The present invention reduces can Some substitute high price resource low carbon ferrochromium, extra low carbon ferrochromium with chrome ore ball, and cost advantage is obvious; Described chrome ore composite pellet joins molten bath after argon oxygen decarburizing furnace oxygen decarburization terminates, can the add-on of accurate calculation chrome ore ball, prevent Molten Steel over-oxidation, and make chrome ore composite pellet chromium, the recovery rate of manganese reaches more than 90%, do not affect the consumption of reduction ferrosilicon, and improve the sweetening power of slag.
Claims (8)
1. a chrome ore composite pellet is used in argon oxygen decarburizing furnace reduction, and it is characterized in that, the weight percentages of components of described chrome ore composite pellet is:
2. chrome ore composite pellet is used in argon oxygen decarburizing furnace reduction according to claim 1, it is characterized in that, Cr in described chrome ore
2o
3mass percentage be 40.0 ~ 50.0%.
3. chrome ore composite pellet use in argon oxygen decarburizing furnace reduction according to claim 1, it is characterized in that, described ferrosilicon by raw coke, aluminium powder, steel cuttings and quartzy or silica, the iron silicon alloy be prepared from electrosmelting.
4. chrome ore composite pellet is used in argon oxygen decarburizing furnace reduction according to claim 1, it is characterized in that, the mass percentage 72.0 ~ 80.0% of described Silicon in Ferrosilicon, mass percentage≤0.50% of carbon.
5. the argon oxygen decarburizing furnace reduction production method of chrome ore composite pellet described in an any one of claim 1-4, it is characterized in that, chromite ore fine is dried or dries to moisture content≤2.0%, the chromite ore fine of drying, manganese metal, ferrosilicon, calcium metal are ground to form fine powder respectively, mixing, then add binding agent and stir, be pressed into pelletizing, seasoning, sealing is preserved stand-by.
6. the argon oxygen decarburizing furnace reduction production method of chrome ore composite pellet according to claim 5, it is characterized in that, the granularity of described fine powder is 0.09 ~ 0.2mm.
7. the argon oxygen decarburizing furnace reduction production method of chrome ore composite pellet according to claim 5, is characterized in that, described in the diameter of pelletizing that is pressed into be 20 ~ 50mm.
8. the argon oxygen decarburizing furnace reduction application of chrome ore composite pellet in argon oxygen decarburizing furnace STEELMAKING PRODUCTION described in an any one of claim 1-4, it is characterized in that, described chrome ore composite pellet joins molten bath when argon oxygen decarburizing furnace reduces, and described chrome ore composite pellet add-on is 5 ~ 20 kgs/tonne of steel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241314A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A method of ferrochrome is prepared with chromite |
| CN110241355A (en) * | 2018-03-08 | 2019-09-17 | 盐城市鑫洋电热材料有限公司 | A kind of ferrochrome prepared with chromite |
| CN114592123A (en) * | 2021-12-27 | 2022-06-07 | 福建通海镍业科技有限公司 | Chromium ore powder ball and preparation method thereof |
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