CN103045854A - Pretreatment method for chromium powder ore used for smelting production of ferrochrome alloy - Google Patents
Pretreatment method for chromium powder ore used for smelting production of ferrochrome alloy Download PDFInfo
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Abstract
The invention provides a pretreatment method for a chromium powder ore used for smelting production of a ferrochrome alloy. The method comprises the steps of 1) mixing the chromium powder ore with a fluxing agent, a reducing agent and a fuel to obtain a mixture; and 2) sintering the mixture to obtain a sintered material. The method is short in process flow and low in sintering cost and is simple and practicable, and production of powder ore pollutions is not easy, so that relatively cheap powder chromium ore can be fully used, smelting consumption can be decreased greatly, and further smelting cost of the ferrochrome is reduced. The sintered material obtained by the sintering treatment method can be directly introduced into an ore smelting electric arc furnace for smelting after smashing. The method can enhance reducibility of furnace charging materials, reduce energy consumption and decrease usage proportion of other auxiliary materials such as coke, silica and the like in the smelting furnace charging materials. At the same time, possibility of reversing materials is greatly decreased, production security is increased and probability of production accidents is reduced greatly.
Description
Technical field
The present invention relates to before ferrochrome is smelted production, chromium powder ore be carried out pretreated method.
Background technology
After the chrome ore exploitation, it is not high that raw ore is processed the lump ore ratio that obtains through ore dressing, is generally about 30%, and great majority are fine ore, so the price of the fine ore cost ratio lump ore on the market hangs down about 10% usually.What China's smelting chromium irons adopted mostly is common mineral hot furnace, requires the ventilation property of furnace charge fine, otherwise can cause stirring, industrial accident occurs.This just requires the massive proportioning in the chrome ore high, usually will reach more than 70%, has therefore caused the ferrochrome production cost higher.If fine ore is made the pelletizing that meets smelting requirements, then can address the above problem.
The agglomerating technology of fine ore comprises the pressure ball of colding pressing, pellet roasting, sintering three types generally speaking:
1, the pressure ball of colding pressing
By binding agent and employing pair roller ball press pelletizing, improved the ventilation property of epipastic mineral.Binding agent is divided into mineral binder bond and organic binder bond two classes.Wherein, the good weatherability of mineral binder bond, such as cement (consumption is 7-8%), wilkinite, water glass (consumption is more than 5%) etc., the usage quantity that needs is large, usually affect the grade of mineral, these binding agents also can enter in the slag, increase energy consumption, and in smelting also easy explosion become powder or fritter.The intensity of selecting cement, water glass pressure ball low temperature still can, the easy explosion of high temperature (high temperature thermal explosion).And organic binder bond such as carbohydrate etc. mainly are comprised of organic compound, place through super-dry under the normal temperature after producing, and cohesiveness is relatively good, but weathering resistance is poor; chance drenches with rain etc. can efflorescence, advance smelting furnace after, after the organism volatilization is complete; usually can again form epipastic mineral, cause stirring, result of use is bad.
The granularity that the pressure ball mode of the method needs is below the 2mm.This mode does not change the performance of mineral itself.The implementation poor effect of this technology, wherein crucial shortcoming is the requirement that the intensity of pelletizing does not reach smelting.
For example, Chinese patent application No.02110712.2 discloses a kind of method with smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet, its with contain chromium powder ore, the chromogen fine ore is made raw material, add the fuel, the flux formation that comprise pulverized anthracite or coke powder or contain charcoal solid waste and contain the chromium powder ore cold bound pellet, this cold bound pellet and solid fuel generation fusion reduction reaction just smelt chrome-bearing alloy molten iron (being ferrochrome).This belongs to fine ore pre-treatment and fusion smelting complete set technology together, and is not suitable for widely used mine heat furnace smelting mode.
2, pellet roasting
An amount of binding agent is mixed with fine ore, add water, adopt the rotating disk mode pelletizing of rolling, then dry, roasting, in roasting process, form the physical crystal bonding of mineral, by pelletizing, can desulfurization, or improve the physico-chemical property of mineral by other prescription, its outward appearance is round and smooth, and intensity is high, is fit to long-distance transportation.Improve the performance of mineral in the time of pelletizing, also obtained a kind of smelting grog.Also can add the wilkinite about 1.5% in the pelletizing pelletizing.It is 200 orders that the method becomes the mode of pelletizing to require the granularity of mineral, and following (the about 200 orders) particle of 0.074mm accounts for more than 80%.The temperature of pellet roasting is generally more than 1200 degree.
The pellet strength that the pellet roasting method is made is good, can satisfy the needs of smelting, but the construction cost of device is higher, the operation more complicated, and need in advance fine ore to be ground to form 200 purpose fine powders, when increasing cost, formed secondary pollution.
For example, Chinese patent application No.200910028258.1 provides a kind of Processes and apparatus for preparing ferrochrome with chromite ore fine.The method being treated to before feeding enters reduction furnace to carry out roasting: ultrafine powder → passivation of batch mixing → grind to form 5-75 μ m → mixing → cause pelletizing, wherein its reduction temperature is 500-1100 ℃.Fusing agent, catalysis burning-rate accelerator, fusing assistant, nucleus reinforcer, radical initiator, pore former etc. have been adopted in the method, comprising the rare earth oxide of costliness.The method belongs to fine ore pre-treatment and fusion smelting complete set technology together equally, also is not suitable for widely used mine heat furnace smelting mode.The method feasibility is not high in addition.
3, sintering
The method is normally mixed powdered ore and part coal, after the rolling pelletizing, carries out sintering at the sintering bed, form mineral liquefaction in the sintering process, promote the intensity that mineral become piece, be convenient to subsequent smelting, the irregular cellular sintering of formation group after sintering is finished forms and smelts grog.
Sintering technology is widely used in the pre-treatment of fine iron ore, but the composition in the fine iron ore is more, and difference is larger each other, and is therefore different according to iron powder mineralogical composition to be dealt with, and formed a lot of different fine iron ore sintering technologies.If mineral to be processed are different, then its concrete enforcement, control mode can be more different.For example the fine iron ore sintering requires highlyer to the iron-holder of fine iron ore, and the iron-holder of fine ore is generally at 60-64%, and the iron-holder of rich ore powder is 45-50%, and the fluctuation that requires iron-holder is ± 1%, and iron-holder is many between 10-25% in the chrome ore; Contain chromium in the fine iron ore seldom, and contain in the chromium powder ore more than the chromium between 35-50%, therefore be applied at present the sintering technology of fine iron ore and be not suitable for chromium powder ore.
Chinese patent application No.200910311007 provides a kind of sintering technology of ferrochrome mineral powder, it obtains finished product agglomerate and granularity that granularity is 3-40mm by following steps is the powder of returning mine of about 3mm: the breeze fine grinding is arrived about 0.074mm greater than 65% rear interpolation bentonite adhesive, fuel, water mixing, pelletizing; Then, wrap one deck fuel in described pellet surface; The sinter machine of packing into, bed of material floor height is 550-700mm; The sintering of lighting a fire after super-dry, preheating, heat sinter are again through overcooling, fragmentation and screening.But there is following shortcoming in this processing method: needs at first chromium powder ore is ground to form 0.074mm greater than 65% fine powder again through pelletizing and wrap one deck fuel at spherome surface could sintering, its complicated operation, production cost is high, and the step that chromium powder ore grinds to form 0.074mm also may be produced the dust secondary pollution, therefore be unfavorable for suitability for industrialized production.
Chinese patent application No.01105197 provides a kind of and has produced the blast furnace method that contains the chromium agglomerate with chromite ore fine and iron-bearing material, its concrete steps are: chromite ore fine and ferrous material, solid fuel and auxiliary flux are mixed according to a certain percentage, sinter into through ordinary sinter equipment and contain the chromium agglomerate.This chromium agglomerate that contains forms specific burden structure together with other blast furnace ironmaking raw material, enters the chromium-containing molten iron that blast-furnace smelting contains chromium 1-30%.Use this explained hereafter to contain the chromium agglomerate, eliminated the coke ratio rising problem of bringing directly into stove because of large quantities of lime stone, but there is following shortcoming in this technique: needs add ferrous material and can only enter the chromium pig iron that contains that blast-furnace smelting contains chromium 1-30%.The method not only cost is high, and can not reach the needs that mine heat furnace smelting contains chromium 50% above ferrochrome.
Summary of the invention
For solving above-mentioned problems of the prior art, the invention provides and a kind ofly before ferrochrome smelt to be produced, chromium powder ore is carried out pretreated method.
Particularly, the invention provides:
A kind ofly before ferrochrome smelt to be produced chromium powder ore is carried out pretreated method, the method comprises: 1) with described chromium powder ore and fusing assistant, reductive agent and fuel mix, obtain compound; And 2) described compound is carried out sintering, obtain sintered material.
Preferably, in described step 1) in, described chromium powder ore directly carries out described mixing without pulverizing or grinding.
Preferably, described chromium powder ore is that particle diameter is the following former chromium powder ore of 10mm.
Preferably, described chromium powder ore accounts for the 80-90% of described compound gross weight.
Preferably, described fusing assistant is one or more that are selected from stone flour, silica, the silica flour, and preferably, described fusing assistant accounts for the 3-6% of described compound gross weight, and preferably, the particle diameter of described fusing assistant is less than or equal to 10mm.
Preferably, described reductive agent is one or more that are selected from coke powder, coal dust, the blue powdered carbon, and preferably, described reductive agent accounts for the 3-8% of described compound gross weight, and preferably, the particle diameter of described reductive agent is less than or equal to 10mm.
Preferably, described fuel is one or more that are selected from coke powder, coal dust, the blue powdered carbon, and preferably, described fuel accounts for the 3-8% of described compound gross weight, and preferably, the particle diameter of described fuel is less than or equal to 10mm.
Preferably, when described reductive agent and described fuel employing same material, the total content of described reductive agent and described fuel accounts for the 6-16% of described compound gross weight.
Preferably, described method also comprises: in described step 1) in, when carrying out described mixing, water sprays, so that the humidity of gained compound reaches 8-12%.
Preferably, in described step 2) in, described sintering carries out in the ring type agglomerating plant.
Preferably, described method also comprises: in described step 2) in, before carrying out described sintering, described compound is arranged on the sintering bed of described ring type agglomerating plant, mix the bed of material to form, then carry out described sintering; Wherein, the thickness of the described mixing bed of material is 35cm-50cm.
Preferably, when carrying out described sintering, make the top of the described mixing bed of material reach 1000-1200 ℃, and along with the carrying out of sintering, the temperature of the inside of the described mixing bed of material reaches 950-1150 ℃, and the internal temperature of resulting described sintered material was 650-800 ℃ after sintering was finished.
Preferably, the thickness of described sintered material is 35cm-50cm.
Preferably, described method also comprises: 3) with described step 2) the described sintered material that obtains is broken into the agglomerate that particle diameter is 20-55mm.
Preferably, described agglomerate hot charging being entered stove directly smelts.
The present invention also provides a kind of sintered material that obtains according to preceding method.
The present invention also provides a kind of agglomerate that obtains according to preceding method.
The present invention compared with prior art has the following advantages and positively effect:
Pretreatment process of the present invention need not grind or pulverize chromium powder ore, and can directly adopt particle diameter is 10mm and following former chromium powder ore, so technical process is short, and sintering is with low cost, and is simple and easy to do, and is difficult for producing the fine ore pollution.Therefore both can take full advantage of relatively cheap chrome ore fines, but decrease is smelted energy consumption again, and then reduce the ferrochrome smelting cost.
The thickness of the sintered material that obtains by sintering processing method of the present invention is 35-50cm, the agglomerating rate of sintering reaches more than 75%, its intensity is enough to satisfy into stove smelts needs, become the agglomerate of 20-55mm particle diameter through crusher in crushing, can directly enter mine heat furnace smelting and contain the ferrochrome of chromium more than 50%, can satisfy the needs that domestic most mineral hot furnace is produced ferrochrome.And the formed agglomerate of the present invention is the porousness piece group of good air permeability, can increase the easy reductibility of furnace charge, reduces energy consumption, the usage ratio of other auxiliary material such as coke, silica etc. in the reduction smelting furnace material.Meanwhile, can greatly reduce the possibility of stirring, increase production security, greatly reduce the industrial accident odds.
Description of drawings
Fig. 1 is the schematic flow sheet of a kind of embodiment of the inventive method, wherein by the ring type sintering process chromium powder ore is carried out pre-treatment;
Fig. 2 is sintering ore bed (namely mixing the bed of material) the heating curve synoptic diagram on the sintering bed of ring type sintering process in a kind of embodiment of the inventive method, and wherein the longitudinal axis represents temperature, and transverse axis represents apart from ignition time (unit: minute).
Embodiment
Below the invention will be further described by the description of embodiment and with reference to accompanying drawing, but this is not to be limitation of the present invention, those skilled in the art are according to basic thought of the present invention, can make various modifications or improvement, but only otherwise break away from basic thought of the present invention, all within the scope of the present invention.
" chromium powder ore " described in the present invention is also referred to as chromite ore fine, powdery chromite etc.; its particle diameter is usually below 10mm; but be not precluded within a small amount of fritter slightly larger than 10mm contained in the chromium powder ore; owing to contain described fritter in a lot of former chromite ore fines; and its content is low; do not affect the sintering result of the inventive method, therefore be considered as the chromium powder ore of particle diameter below 10mm yet, and be included within protection scope of the present invention.The kind of described chromium powder ore comprises grade (Cr
2O
3Content) at the various chrome ore fines of 35-55%.The chromium powder ore that wherein adopts among the present invention can be (such as) chromium powder ore produced of the states such as South Africa, Zimbabwe, Turkey, Philippines.
Described " former chromite ore fine " refers to that the dealer is adopted, selected to chrome ore through selected production but without the chrome ore fines of other processing herein.
" fusing assistant " among the present invention refers to the various materials that can reduce mixed metal oxide fusing point in the chromium powder ore.For the consideration aspect the cost, the normal fusing assistant that adopts be the material (such as stone flour, silica flour, silica etc.) including (for example) calcium salt, silicon oxide etc., still the invention is not restricted to this in industrial production.Wherein stone flour refers to be rich in the powdery building stones of calcium, silicon composition.The particle diameter of described fusing assistant is preferably≤10mm.
" reductive agent " among the present invention refers to the various materials that the metal oxides such as the chromium in the chromium powder ore, iron, magnesium, aluminium can be reduced.For the consideration aspect the cost, the normal reductive agent that adopts is that various main components are the material (for example, coke powder, coal dust, blue powdered carbon etc.) of carbon, but the invention is not restricted to this in industrial production.The particle diameter of described reductive agent is preferably≤10mm.
" fuel " among the present invention refers to the various materials that can improve by burning the sintered layer temperature.Its main component can be carbon, and manifestation can be (for example) coke powder, coal dust, blue powdered carbon.The particle diameter of described fuel is preferably≤10mm.
In one embodiment of the present invention, reductive agent can adopt respectively different materials with fuel.And in another embodiment of the invention, reductive agent and fuel can adopt the same material.When reductive agent and fuel employing same material, the total content of reductive agent and fuel accounts for the 6-16% of compound gross weight.
The purpose of this invention is to provide a kind of industrially preparing process that chromium powder ore can be sintered into the suitable required agglomerate of mine heat furnace smelting ferrochrome.
Method of the present invention preferably includes: 1) with chromium powder ore and fusing assistant, reductive agent and fuel mix, obtain compound; And 2) compound is carried out sintering, obtain sintered material.Wherein, further preferably, chromium powder ore without grind or be crushed to about 75 μ m in addition lower ultrafine powder just directly and fusing assistant, reductive agent and fuel mix.In compound, the content of chromium powder ore can be 80-90%; The content of fusing assistant can be the 3-6 % by weight; The content of reductive agent can be the 3-8 % by weight; The content of fuel can be the 3-8 % by weight.
Hereinafter will describe the present invention take the ring type sintering process as example, but the invention is not restricted to this, the present invention can be used for main ingredient is mixed the rear any sintering method that adopts igniting bottom, top air inducing.
The circular travelling sintering machine that wherein adopts is to be used for the general sinter machine of fine iron ore sintering (such as 36M
2, 42M
2, 70M
2Sinter machine etc.), to this without particular requirement.
In chromium powder ore sintering preprocessing process, take chromium powder ore (content is as the 80-90 % by weight) as the sintering main raw material, take fusing assistant (content is as (for example) 3-6 % by weight), reductive agent (content is as (for example) 3-8 % by weight), fuel (content is as (for example) 3-8 % by weight) as subsidiary material.Preferably, at first that major-minor material mixing is even, leading, spray water in the auxiliary material mixing process, make the humidity that mixes rear compound reach 8-12%, then this mixture is laid in (thickness is 35cm-50cm) in the circular travelling sintering machine, after ignition device, below the sintering ore bed, produce negative pressure, air is circulated from top to bottom, impel the full combustion of fuel in the sintering ore bed, and utilize reductive agent reduction part metals oxide compound to form aqueous metal or liquid oxygen compound, thus sinter chromium powder ore into sinter bed (thickness is 35cm-50cm), then be broken into satisfactory agglomerate (diameter 20-55mm).
The fusing assistant that the present embodiment adopts can be selected different stone flour (when hanging down as chromium powder ore is siliceous, can adopt siliceous higher stone flour or silica flour) to the requirement adjustment of sintering agglomerate with reference to composition and the smelting of chrome ore fines take stone flour as main component.
The reductive agent that the present embodiment adopts and fuel all can adopt the carbon class material that reaches certain thermal value (should greater than 4000kcal/kg), such as coal dust, coke powder or blue powdered carbon, the ratio of using can and be smelted the requirement of sintering agglomerate is adjusted with reference to the composition of chrome ore fines, for example, when the content of ferric oxide is higher than 14 % by weight, reductive agent can adopt thermal value slightly to hang down the carbon of some, such as coal dust or blue powdered carbon; When the content of ferric oxide was lower than 14 % by weight, reductive agent can adopt the slightly high carbon of thermal value, preferred coke.Fuel all can adopt blue powdered carbon.When reductive agent and fuel employing same material, the total content of described reductive agent and fuel is the 6-16 % by weight.
In sintering process, reductive agent reduction part metals oxide compound forms aqueous metal or liquid oxygen compound, thereby chromium powder ore is formed satisfactory group.Mineral middle part grouping lease making reduction liquefaction, part composition do not occur that the part composition at high temperature volatilizees in forming section cavity after physical change, the fuel combustion, the mineral, form gas overflowing after the metal oxide partial reduction, so comprehensive the variation so that the mineral of sintering after finishing form the irregular agglomerate of porousness, sintered material sintering thickness 35-50cm, sinter strength is enough to satisfy into stove smelts needs, and the agglomerating rate of sintering reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, can enter stove and smelt.Therefore can greatly improve the being reduced property of chrome ore, greatly reduce the proportion of the industrial accident such as stirring simultaneously.In addition, because used reductive agent in the sintering process, the part metals oxide compound obtains prereduction, thereby can reduce the use of coke in the smelting and reduce energy consumption.In the prior art, adopt the usage ratio of coke to be about into 20% of stove material during ferrochrome is smelted under normal circumstances; Silica accounts for about 5%.And behind chromium powder ore employing the inventive method sintering, the usage ratio of (for example) coke that adopts during ferrochrome is smelted is about 12%, silica about 3%.
The mineral hot furnace (such as 12500KVA, 25000KVA, 35000KVA mineral hot furnace etc.) that the agglomerate that obtains by the inventive method generally adopts applicable to China's ferrochrome production industry, to this without particular requirement.
Mode by the following examples further explains and describes content of the present invention, but these embodiment are not to be construed as limiting the scope of the invention.
The chromium powder ore that adopts in following examples is Turkey's chromogen powder, its grade (Cr
2O
3Content) be 47.35%; And the South Africa chromium powder ore, its grade is 41.53%.
The circular travelling sintering machine that adopts in following examples can be the 36M that derives from the logical mining and metallurgy machinofacture company limited of Shanxi
2Circular travelling sintering machine.
The mineral hot furnace that adopts in following examples is the 12500KVA mineral hot furnace that China's ferrochrome production industry generally adopts, and can be built by the Ningxia sharp chemical metallurgy of perseverance company limited.
Embodiment 1
Main raw material: Turkey's chromium powder ore, particle diameter are 0-10mm, and content (take the % by weight of all raw materials) is as 88%;
Auxiliary material:
Fusing assistant: common stone flour, content (take the % by weight of all raw materials) is as 4%;
Reductive agent: coal dust (take the % by weight of all raw materials) is as 4%;
Fuel: blue powdered carbon, content (take the % by weight of all raw materials) is as 4%.
As shown in Figure 1, through mixing, spray water in main materials and auxiliary materials mixing process makes the humidity that mixes rear compound reach 10%, then this mixture is laid in (thickness is 50cm) in the circular travelling sintering machine with main raw material, auxiliary material.Fuel in sintered material is ignited in the coal gas ignition burning, sintering ore bed top reaches 1100 ℃, then progressively burning downwards under the induced draft fan negative pressure, the internal temperature of sintering ore bed is about 500 ℃ when reaching the discharging position about 1050 ℃.The sintered material discharging can be sent into mine heat furnace smelting.
Igniting adopts coal gas need to reach regulation calorific value (also can adopt Sweet natural gas or blast furnace gas to substitute).Fig. 2 is seen in the control of sintering temperature, time, compound enters and by lighter for ignition compound upper strata temperature was heated to 1100 ℃ in 10 minutes behind the ignition zone and namely leaves seed region, along with lower floor is progressively moved towards in burning under the negative pressure, the temperature of compound inside progressively heats up from top to bottom, medial temperature be 1050 ℃ until all burnt.Shown in Figure 2 is that sintered layer is finished the temperature changing process of sintering from beginning to light a fire to.After sintering was finished, this agglomerate group can be used for smelting ferrochrome directly into stove after fragmentation.Fallen powder can reclaim and again enter sintering procedure under the negative pressure, and the gas of eliminating discharges after dedusting.
Sintered material sintering thickness 50cm, sinter strength are enough to satisfy into stove smelting needs, and the agglomerating rate of sintering reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, can enter stove and smelt.
Main raw material: the South Africa chromium powder ore, content (take the % by weight of all raw materials) is as 83%;
Auxiliary material:
Fusing assistant: ground silica, content (take the % by weight of all raw materials) is as 5%;
Reductive agent: coke powder, content (take the % by weight of all raw materials) is as 6%;
Fuel: coal dust, content (take the % by weight of all raw materials) is as 6%.
As shown in Figure 1, through mixing, spray water in main materials and auxiliary materials mixing process makes the humidity that mixes rear compound reach 11%, then this mixture is laid in (thickness is 35cm) in the circular travelling sintering machine with main raw material, auxiliary material.Fuel in sintered material is ignited in the coal gas ignition burning, sintering ore bed top reaches 1100 ℃, then progressively burning downwards under the induced draft fan negative pressure, the internal temperature of sintering ore bed is about 500 ℃ when reaching the discharging position about 1050 ℃.The sintered material discharging can be sent into mine heat furnace smelting.
Igniting adopts coal gas need to reach regulation calorific value (also can adopt Sweet natural gas or blast furnace gas to substitute).Fig. 2 is seen in the control of sintering temperature, time, and the concrete explanation that heats up is such as embodiment 1, and then this agglomerate group can be used for smelting ferrochrome directly into stove after fragmentation.Fallen powder can reclaim and again enter sintering procedure under the negative pressure, and the gas of eliminating discharges after dedusting.
Sintered material sintering thickness 35cm.Sinter strength is enough to satisfy into stove smelts needs, and the agglomerating rate of sintering reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, can enter stove and smelt.
Claims (17)
1. one kind is carried out pretreated method to chromium powder ore before ferrochrome is smelted production, and the method comprises:
1) with described chromium powder ore and fusing assistant, reductive agent and fuel mix, obtains compound; And
2) described compound is carried out sintering, obtain sintered material.
2. method according to claim 1, wherein, in described step 1) in, described chromium powder ore directly carries out described mixing without pulverizing or grinding.
3. method according to claim 2, wherein, described chromium powder ore is that particle diameter is the following former chromium powder ore of 10mm.
4. method according to claim 1, wherein, described chromium powder ore accounts for the 80-90% of described compound gross weight.
5. method according to claim 1, wherein, described fusing assistant is one or more that are selected from stone flour, silica, the silica flour, and described fusing assistant accounts for the 3-6% of described compound gross weight, and the particle diameter of described fusing assistant is less than or equal to 10mm.
6. method according to claim 1, wherein, described reductive agent is one or more that are selected from coke powder, coal dust, the blue powdered carbon, and described reductive agent accounts for the 3-8% of described compound gross weight, and the particle diameter of described reductive agent is less than or equal to 10mm.
7. method according to claim 1, wherein, described fuel is one or more that are selected from coke powder, coal dust, the blue powdered carbon, and described fuel accounts for the 3-8% of described compound gross weight, and the particle diameter of described fuel is less than or equal to 10mm.
8. method according to claim 1, wherein, when described reductive agent and described fuel adopted the same material, the total content of described reductive agent and described fuel accounted for the 6-16% of described compound gross weight.
9. method according to claim 1, wherein said method also comprises: in described step 1) in, when carrying out described mixing, water sprays, so that the humidity of gained compound reaches 8-12%.
10. method according to claim 1, wherein, in described step 2) in, described sintering carries out in the ring type agglomerating plant.
11. method according to claim 10, wherein said method also comprises: in described step 2) in, before carrying out described sintering, described compound is arranged on the sintering bed of described ring type agglomerating plant, mix the bed of material to form, then carry out described sintering; Wherein, the thickness of the described mixing bed of material is 35cm-50cm.
12. method according to claim 11, wherein, when carrying out described sintering, make the top of the described mixing bed of material reach 1000-1200 ℃, and along with the carrying out of sintering, the temperature of the inside of the described mixing bed of material reaches 950-1150 ℃, and the internal temperature of resulting described sintered material was 650-800 ℃ after sintering was finished.
13. method according to claim 12, wherein, the thickness of described sintered material is 35cm-50cm.
14. each described method according to claim 1-13, wherein, described method also comprises:
3) with described step 2) the described sintered material that obtains is broken into the agglomerate that particle diameter is 20-55mm.
15. a ferrochrome smelting process, the method comprises: the described agglomerate hot charging in the claim 14 is entered stove directly smelt.
16. one kind according to claim 1-13 in the sintered material that obtains of each described method.
17. agglomerate that method according to claim 14 obtains.
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| CN103962568A (en) * | 2014-04-15 | 2014-08-06 | 昆明理工大学 | Method for preparing reduction chromium powder through microwave heating |
| CN104451131A (en) * | 2015-01-09 | 2015-03-25 | 山东鑫海科技股份有限公司 | Powder chrome ore reducing sintering agglomeration technique |
| CN105658828A (en) * | 2013-10-21 | 2016-06-08 | Kwg资源公司 | Production of chromium iron alloys directly from chromite ore |
| CN105908061A (en) * | 2016-06-12 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method for producing high-carbon ferrochrome |
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| CN114935264A (en) * | 2022-05-20 | 2022-08-23 | 中南大学 | Low-carbon sintering method based on biomass charcoal-hydrogen-rich gas coupling injection |
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| CN107699685A (en) * | 2017-08-09 | 2018-02-16 | 江苏省冶金设计院有限公司 | A kind of production method of silicochromium |
| CN114935264A (en) * | 2022-05-20 | 2022-08-23 | 中南大学 | Low-carbon sintering method based on biomass charcoal-hydrogen-rich gas coupling injection |
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