CN103045854B - The pretreatment process of the chromium powder ore produced is smelted for ferrochrome - Google Patents
The pretreatment process of the chromium powder ore produced is smelted for ferrochrome Download PDFInfo
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Abstract
The invention provides a kind of pretreatment process smelting the chromium powder ore produced for ferrochrome.The method comprises: 1) by described chromium powder ore and fusing assistant, reductive agent and fuel mix, obtain compound; And 2) described compound is sintered, obtain sintered material.Present invention process flow process is short, sinters with low cost, simple and easy to do, and not easily produces fine ore pollution.Therefore both can make full use of the chrome ore fines of relative moderate, can significantly reduce smelting energy consumption again, and then reduce ferrochrome smelting cost.The sintered material obtained by sintering processing method of the present invention directly can enter mine heat furnace smelting through fragmentation.The inventive method can also increase the easy reductibility of furnace charge, reduces energy consumption, and in reduction smelting furnace material, other auxiliary material is as the usage ratio of coke, silica etc.Meanwhile, greatly can reduce the possibility of stirring, increase production security, greatly reduce industrial accident odds.
Description
Technical field
The present invention relates to, before production smelted by ferrochrome, pretreated method is carried out to chromium powder ore.
Background technology
After chrome ore exploitation, the lump ore ratio that raw ore obtains through ore dressing process is not high, is generally about 30%, and great majority are fine ore, and the price of the fine ore cost ratio lump ore therefore on market is usually low by about 10%.What China's smelting chromium irons adopted mostly is common mineral hot furnace, requires that the ventilation property of furnace charge is fine, otherwise can cause stirring, occur industrial accident.This just requires that the massive proportioning in chrome ore is high, usually will reach more than 70%, therefore cause ferrochrome production cost higher.If fine ore to be made the pelletizing meeting smelting requirements, then can solve the problem.
The technology that generally fine ore is agglomerating comprises pressure ball of colding pressing, pellet roasting, sintering three types:
1, to cold pressing pressure ball
By binding agent and employing pair roller ball press pelletizing, improve the ventilation property of epipastic mineral.Binding agent is divided into mineral binder bond and organic binder bond two class.Wherein, the good weatherability of mineral binder bond, as cement (consumption is 7-8%), wilkinite, water glass (consumption is more than 5%) etc., the usage quantity needed is large, usually affect the grade of mineral, these binding agents also can enter in slag, increase energy consumption, and also easily burst into powder or fritter in smelting.Select the intensity of cement, water glass pressure ball low temperature still can, high temperature easily bursts (high temperature thermal explosion).And organic binder bond such as carbohydrate etc. forms primarily of organic compound, place through super-dry under normal temperature after producing, cohesiveness is relatively good, but weathering resistance is poor; the meeting efflorescence such as chance drenches with rain, after entering smelting furnace, after organism volatilization; usually again can form epipastic mineral, cause stirring, result of use is bad.
The granularity that the pressure ball mode of the method needs is below 2mm.The performance of this mode to mineral itself does not change.The concrete implementation result of this technology is very poor, and wherein crucial shortcoming is the requirement that the intensity of pelletizing does not reach smelting.
Such as, Chinese patent application No.02110712.2 discloses a kind of method of smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet, it is to make raw material containing chromium powder ore, chromogen fine ore, add and comprise pulverized anthracite or coke powder or formed containing chromium powder ore cold bound pellet containing the fuel of charcoal solid waste, flux, this cold bound pellet and solid fuel generation fusion reduction reaction just smelt chrome-bearing alloy molten iron (i.e. ferrochrome).This belongs to the complete set technology of fine ore pre-treatment together with fusion smelting, and is not suitable for widely used mine heat furnace smelting mode.
2, pellet roasting
Appropriate binding agent is mixed with fine ore, add water, adopt carousel mode rolling pelletizing, then dry, roasting, the physical crystal bonding of mineral is formed in roasting process, by pelletizing, can desulfurization, or the physico-chemical property of mineral is improved by other formula, its outward appearance is round and smooth, and intensity is high, is applicable to long-distance transportation.Improve the performance of mineral while pelletizing, also obtain a kind of smelting grog.Also the wilkinite of about 1.5% can be added in pelletizing pelletizing.The method become the mode of pelletizing to require the granularity of mineral is 200 orders, below 0.074mm (about 200 order) particle accounts for more than 80%.The temperature of pellet roasting is generally more than 1200 degree.
The pellet strength that pellet roasting method is made is good, can meet the needs of smelting, but the construction cost of device is higher, operation more complicated, and needs fine ore to be ground to form 200 object fine powders in advance, while increase cost, define secondary pollution.
Such as, Chinese patent application No.200910028258.1 provides the Processes and apparatus that a kind of chromite ore fine prepares ferrochrome.The method feeding enter reduction furnace carry out roasting before process be: the ultrafine powder → passivation of batch mixing → grind to form 5-75 μm → mix → cause pelletizing, wherein its reduction temperature is 500-1100 DEG C.Have employed fusing agent, catalysis burning-rate accelerator, fusing assistant, nucleus reinforcer, radical initiator, pore former etc., comprising the rare earth oxide of costliness in the method.The method belongs to the complete set technology of fine ore pre-treatment together with fusion smelting equally, is not also suitable for widely used mine heat furnace smelting mode.In addition the method feasibility is not high.
3, sinter
The method, normally by powdered ore and the mixing of part coal, after rolling pelletizing, sinters at sintering bed, form mineral liquefaction in sintering process, promote the intensity that mineral become block, be convenient to subsequent smelting, sinter the irregular cellular sintering group of rear formation, formed and smelt grog.
Sintering technology is widely used in the pre-treatment of fine iron ore, but composition in fine iron ore is more, and mutual difference is comparatively large, therefore different according to iron powder mineralogical composition to be dealt with, and defines much different fine iron ore sintering technologies.If mineral to be processed are different, then its concrete enforcement, control mode can be more different.Such as fine iron ore sintering requires higher 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 requires that the fluctuation of iron-holder is ± 1%, and in chrome ore, iron-holder is many between 10-25%; Little containing chromium in fine iron ore, and many between 35-50% containing chromium in chromium powder ore, be therefore applied to the sintering technology of fine iron ore at present 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 by following steps the powder of returning mine that finished product agglomerate that granularity is 3-40mm and granularity are about 3mm: breeze fine grinding is added bentonite adhesive, fuel, water mixing, pelletizing after about 0.074mm is greater than 65%; Then, one deck fuel is wrapped in described pellet surface; Load sinter machine, bed of material floor height is 550-700mm; Igniting sintering after super-dry, preheating, heat sinter is again through overcooling, fragmentation and screening.But there is following shortcoming in this processing method: need first to be ground to form by chromium powder ore fine powder that 0.074mm is greater than 65% and wrap one deck fuel at spherome surface could sinter through pelletizing again, its complicated operation, production cost is high, and step chromium powder ore being ground to form 0.074mm also may produce dust secondary pollution, is therefore unfavorable for suitability for industrialized production.
Chinese patent application No.01105197 provides a kind of chromite ore fine and iron-bearing material produces the method for blast furnace containing chromium agglomerate, its concrete steps are: chromite ore fine and ferrous material, solid fuel and auxiliary flux are mixed according to a certain percentage, sinter into containing chromium agglomerate through ordinary sinter equipment.This chromium agglomerate that contains forms specific burden structure together with other blast furnace ironmaking raw material, enters the chromium-containing molten iron of blast-furnace smelting containing chromium 1-30%.Use this explained hereafter containing chromium agglomerate, eliminate the coke ratio brought because large quantities of lime stone directly enters stove and raise problem, but this technique exist following shortcoming: need to add ferrous material and can only enter blast-furnace smelting containing chromium 1-30% containing chromium pig iron.The method not only cost is high, and can not reach the needs of mine heat furnace smelting containing chromium more than 50% ferrochrome.
Summary of the invention
For solving above-mentioned problems of the prior art, the invention provides one, before production smelted by ferrochrome, pretreated method being carried out to chromium powder ore.
Specifically, the invention provides:
One carries out pretreated method to chromium powder ore before production smelted by ferrochrome, and the method comprises: 1) by described chromium powder ore and fusing assistant, reductive agent and fuel mix, obtain compound; And 2) described compound is sintered, obtain sintered material.
Preferably, in described step 1) in, described chromium powder ore directly carries out described mixing without pulverizing or grinding.
Preferably, the former chromium powder ore of described chromium powder ore to be particle diameter be below 10mm.
Preferably, described chromium powder ore accounts for the 80-90% of described compound gross weight.
Preferably, described fusing assistant is be selected from one or more in stone flour, silica, 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 for being less than or equal to 10mm.
Preferably, described reductive agent is be selected from one or more in coke powder, coal dust, 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 for being less than or equal to 10mm.
Preferably, described fuel is be selected from one or more in coke powder, coal dust, 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 for being less than or equal to 10mm.
Preferably, when described reductive agent and described fuel adopt 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, spraying with water, reaching 8-12% to make the humidity of gained compound.
Preferably, in described step 2) in, described sintering carries out in 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, to form the mixing bed of material, then carries out described sintering; Wherein, the thickness of the described mixing bed of material is 35cm-50cm.
Preferably, when carrying out described sintering, the top of the described mixing bed of material is made to reach 1000-1200 DEG C, and along with the carrying out sintered, the temperature of the inside of the described mixing bed of material reaches 950-1150 DEG C, and the internal temperature having sintered rear obtained described sintered material is 650-800 DEG C.
Preferably, the thickness of described sintered material is 35cm-50cm.
Preferably, described method also comprises: 3) by 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 is entered stove directly to smelt.
The present invention also provides a kind of sintered material obtained according to preceding method.
The present invention also provides a kind of agglomerate obtained 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 chromium powder ore or pulverize, and can directly adopt particle diameter to be 10mm and following former chromium powder ore, therefore technical process is short, sinters with low cost, simple and easy to do, and not easily produces fine ore pollution.Therefore both can make full use of the chrome ore fines of relative moderate, can significantly reduce smelting energy consumption again, and then reduce ferrochrome smelting cost.
The thickness of the sintered material obtained by sintering processing method of the present invention is 35-50cm, sinter agglomerating rate and reach more than 75%, its intensity is enough to meet smelts needs into stove, the agglomerate of 20-55mm particle diameter is become through crusher in crushing, directly can enter the ferrochrome of mine heat furnace smelting containing chromium more than 50%, the needs that domestic most mineral hot furnace produces ferrochrome can be met.And the agglomerate that the present invention is formed is the porousness block group of good air permeability, can increase the easy reductibility of furnace charge, reduce energy consumption, in reduction smelting furnace material, other auxiliary material is as the usage ratio of coke, silica etc.Meanwhile, greatly can reduce the possibility of stirring, increase production security, greatly reduce industrial accident odds.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of embodiment of the inventive method, wherein carries out pre-treatment by ring type sintering process to chromium powder ore;
Fig. 2 is sintering ore bed (namely mixing the bed of material) the heating curve schematic 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 distance ignition time (unit: minute).
Embodiment
Below by way of embodiment description and the invention will be further described with reference to accompanying drawing, but this is not limitation of the present invention, those skilled in the art are according to basic thought of the present invention, various amendment or improvement can be made, but only otherwise depart 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 at below 10mm; but be not precluded within a small amount of fritter slightly larger than 10mm contained in chromium powder ore; owing to containing described fritter in a lot of former chromite ore fine; and its content is low; do not affect the sintering result of the inventive method, be therefore considered as the chromium powder ore of particle diameter at 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 wherein adopted in the present invention can be the chromium powder ore that the states such as (such as) South Africa, Zimbabwe, Turkey, Philippines produce.
Described herein " former chromite ore fine " refers to that chrome ore is adopted, selects dealer through selected production but the chrome ore fines processed without other.
" fusing assistant " in the present invention refers to the various material that can reduce mixed metal oxide fusing point in chromium powder ore.In the industrial production for the consideration of cost aspect, the normal fusing assistant adopted is the material (such as stone flour, silica flour, silica etc.) including (for example) calcium salt, silicon oxide etc., but the present invention is not limited thereto.Wherein stone flour refers to the powdery building stones being rich in calcium, silicon composition.The particle diameter of described fusing assistant is preferably≤10mm.
" reductive agent " in the present invention refers to the various material that the metal oxides such as the chromium in chromium powder ore, iron, magnesium, aluminium can be carried out reducing.In the industrial production for the consideration of cost aspect, the material (such as, coke powder, coal dust, blue powdered carbon etc.) of the normal reductive agent adopted to be various main component be carbon, but the present invention is not limited thereto.The particle diameter of described reductive agent is preferably≤10mm.
" fuel " in the present invention refers to the various material that can be improved sintered layer temperature by burning.Its main component can be carbon, and manifestation can be (such as) 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 and fuel can adopt different materials respectively.And in another embodiment of the invention, reductive agent and fuel can adopt same material.When reductive agent and fuel adopt same material, the total content of reductive agent and fuel accounts for the 6-16% of compound gross weight.
The object of this invention is to provide a kind of industrially preparing process that chromium powder ore can be sintered into agglomerate needed for applicable mine heat furnace smelting ferrochrome.
Method of the present invention preferably includes: 1) by chromium powder ore and fusing assistant, reductive agent and fuel mix, obtain compound; And 2) compound is sintered, obtain sintered material.Wherein, further preferably, chromium powder ore is without ultrafine powder just direct and fusing assistant, reductive agent and the fuel mix grinding or be crushed to about 75 μm even lower.In compound, the content of chromium powder ore can be 80-90%; The content of fusing assistant can be 3-6 % by weight; The content of reductive agent can be 3-8 % by weight; The content of fuel can be 3-8 % by weight.
Hereinafter for ring type sintering process, will describe the present invention, but the present invention is not limited thereto, the present invention can be used for any sintering method by adopting igniting bottom, top air inducing after main ingredient mixing.
Wherein adopted circular travelling sintering machine be for fine iron ore sintering general sinter machine (as 36M
2, 42M
2, 70M
2sinter machine etc.), to this without particular requirement.
In chromium powder ore sintering preprocessing process, using chromium powder ore (content is 80-90 % by weight) as sintering main raw material, using fusing assistant (content is (such as) 3-6 % by weight), reductive agent (content is (such as) 3-8 % by weight), fuel (content is (such as) 3-8 % by weight) as subsidiary material.Preferably, first by even for major-minor material mixing, leading, spray water in auxiliary material mixing process, the humidity mixing rear compound is made to reach 8-12%, then this mixture is laid in (thickness is 35cm-50cm) in circular travelling sintering machine, after ignition device, negative pressure is produced in the below of sintering ore bed, air is circulated from top to bottom, impel the full combustion of fuel in sintering ore bed, and utilize reductive agent reduction partial metal oxide thing to form aqueous metal or liquid oxygen compound, thus chromium powder ore is sintered into sinter bed (thickness is 35cm-50cm), then satisfactory agglomerate (diameter 20-55mm) is broken into.
The fusing assistant that the present embodiment adopts take stone flour as main component, can refer to the composition of chrome ore fines and smelt different stone flour when lower (as siliceous in chromium powder ore, can adopt siliceous higher stone flour or silica flour) is selected to the requirement adjustment of sintering agglomerate.
The reductive agent that the present embodiment adopts and fuel all can adopt the carbon class material reaching certain thermal value (should be greater than 4000kcal/kg), as coal dust, coke powder or blue powdered carbon, the ratio used can refer to the composition of chrome ore fines and smelts the requirement sintering agglomerate and adjust, such as, when ferric oxide content higher than 14 % by weight time, reductive agent can adopt the carbon that thermal value is slightly lower, as coal dust or blue powdered carbon; When ferric oxide content lower than 14 % by weight time, reductive agent can adopt the carbon that thermal value is slightly high, preferred coke.Fuel all can adopt blue powdered carbon.When reductive agent and fuel adopt same material, the total content of described reductive agent and fuel is 6-16 % by weight.
In sintering process, reductive agent reduction partial metal oxide thing forms aqueous metal or liquid oxygen compound, thus chromium powder ore is formed satisfactory piece of group.Divide into groups in the middle part of mineral lease making reduction liquefaction, fractions there is not physical change, fuel combustion after forming section cavity, fractions at high temperature volatilizees, forms gas overflowing after metal oxide party reduction in mineral, so comprehensive change makes the irregular agglomerate of mineral formation porousness after having sintered, sintered material sintering thickness 35-50cm, sinter strength is enough to meet smelts needs into stove, sinters agglomerating rate and reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, stove can be entered and smelt.Therefore greatly can improve the being reduced property of chrome ore, greatly reduce the proportion of the industrial accidents such as stirring simultaneously.In addition, because employ reductive agent in sintering process, partial metal oxide thing obtains prereduction, thus can reduce the use of coke in smelting and reduce energy consumption.In the prior art, under normal circumstances ferrochrome smelt in adopt the usage ratio of coke be about into stove material 20%; Silica accounts for about 5%.And after chromium powder ore adopts the inventive method to sinter, the usage ratio of (such as) coke that ferrochrome adopts in smelting is about 12%, silica about 3%.
The agglomerate obtained by the inventive method is applicable to the mineral hot furnace (as 12500KVA, 25000KVA, 35000KVA mineral hot furnace etc.) that China's ferrochrome production industry generally adopts, to this without particular requirement.
Mode by the following examples further explains and describes content of the present invention, but these embodiments are not to be construed as limiting the scope of the invention.
The chromium powder ore adopted in following examples is Turkey's chromogen powder, its grade (Cr
2o
3content) be 47.35%; And South Africa chromium powder ore, its grade is 41.53%.
The circular travelling sintering machine adopted in following examples can be the 36M deriving from Shanxi and lead to mining and metallurgy Machinery Manufacturing Co., Ltd.
2circular travelling sintering machine.
The mineral hot furnace adopted in following examples is the 12500KVA mineral hot furnace that China's ferrochrome production industry generally adopts, and can be built by Ningxia Heng Li chemical metallurgy company limited.
Embodiment 1
Main raw material: Turkey's chromium powder ore, particle diameter is 0-10mm, and content (in % by weight of all raw materials) is 88%;
Auxiliary material:
Fusing assistant: common stone flour, content (in % by weight of all raw materials) is 4%;
Reductive agent: coal dust (in % by weight of all raw materials) is 4%;
Fuel: blue powdered carbon, content (in % by weight of all raw materials) is 4%.
As shown in Figure 1, by main raw material, auxiliary material through mixing, spray water in main materials and auxiliary materials mixing process, makes the humidity mixing rear compound reach 10%, is then laid in by this mixture (thickness is 50cm) in circular travelling sintering machine.To burn the fuel ignited in sintered material through coal gas ignition, sintering ore bed top reaches 1100 DEG C, then progressively burns downwards under induced draft fan negative pressure, and the internal temperature of sintering ore bed, at about 1050 DEG C, is about 500 DEG C when reaching unloading position.Sintered material discharging can send into mine heat furnace smelting.
Igniting adopts coal gas to need to reach regulation calorific value (Sweet natural gas or blast furnace gas also can be adopted to substitute).Fig. 2 is shown in the control of sintering temperature, time, by lighter for ignition, compound upper strata temperature is heated to 1100 DEG C in 10 minutes after compound enters ignition zone and namely leaves seed region, progressively lower floor is moved towards along with burning under negative pressure, the temperature of compound inside progressively heats up from top to bottom, medial temperature be 1050 DEG C until all burnt.Shown in Fig. 2 be sintered layer from igniting to the temperature changing process completing sintering.After having sintered, this agglomerate group can be used for directly entering stove and smelts ferrochrome after fragmentation.The powder fallen under negative pressure can reclaim and again enter sintering procedure, and the gas of eliminating discharges after dedusting.
Sintered material sintering thickness 50cm, sinter strength is enough to meet smelts needs into stove, sinters agglomerating rate and reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, stove can be entered and smelt.
Embodiment 2
Main raw material: South Africa chromium powder ore, content (in % by weight of all raw materials) is 83%;
Auxiliary material:
Fusing assistant: ground silica, content (in % by weight of all raw materials) is 5%;
Reductive agent: coke powder, content (in % by weight of all raw materials) is 6%;
Fuel: coal dust, content (in % by weight of all raw materials) is 6%.
As shown in Figure 1, by main raw material, auxiliary material through mixing, spray water in main materials and auxiliary materials mixing process, makes the humidity mixing rear compound reach 11%, is then laid in by this mixture (thickness is 35cm) in circular travelling sintering machine.To burn the fuel ignited in sintered material through coal gas ignition, sintering ore bed top reaches 1100 DEG C, then progressively burns downwards under induced draft fan negative pressure, and the internal temperature of sintering ore bed, at about 1050 DEG C, is about 500 DEG C when reaching unloading position.Sintered material discharging can send into mine heat furnace smelting.
Igniting adopts coal gas to need to reach regulation calorific value (Sweet natural gas or blast furnace gas also can be adopted to substitute).Fig. 2 is shown in the control of sintering temperature, time, and concrete intensification illustrates as embodiment 1, and then this agglomerate group can be used for directly entering stove smelting ferrochrome after fragmentation.The powder fallen under negative pressure can reclaim and again enter sintering procedure, and the gas of eliminating discharges after dedusting.
Sintered material sintering thickness 35cm.Sinter strength is enough to meet smelts needs into stove, sinters agglomerating rate and reaches more than 75%.Become the agglomerate of 20-55mm particle diameter through crusher in crushing, stove can be entered and smelt.
Claims (9)
1. before production smelted by ferrochrome, carry out a pretreated method to chromium powder ore, the method comprises:
1) by described chromium powder ore and fusing assistant, reductive agent and fuel mix, compound is obtained; And
2) described compound is sintered, obtain sintered material;
Wherein, in described step 1) in, the former chromium powder ore of described chromium powder ore to be particle diameter be below 10mm and directly carry out described mixing without pulverizing or grinding;
Wherein, described chromium powder ore accounts for the 80-90% of described compound gross weight;
Described fusing assistant is be selected from one or more in stone flour, silica, 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 for being less than or equal to 10mm;
Described reductive agent is be selected from one or more in coke powder, coal dust, 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 for being less than or equal to 10mm;
Described fuel is be selected from one or more in coke powder, coal dust, blue powdered carbon, and described fuel accounts for the 3-8% of described compound gross weight, and the particle diameter of described fuel is for being less than or equal to 10mm.
2. method according to claim 1, wherein, when described reductive agent and described fuel adopt same material, the total content of described reductive agent and described fuel accounts for the 6-16% of described compound gross weight.
3. method according to claim 1, wherein said method also comprises: in described step 1) in, when carrying out described mixing, spraying with water, reaching 8-12% to make the humidity of gained compound.
4. method according to claim 1, wherein, in described step 2) in, described sintering carries out in ring type agglomerating plant.
5. method according to claim 4, 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, to form the mixing bed of material, then carry out described sintering; Wherein, the thickness of the described mixing bed of material is 35cm-50cm.
6. method according to claim 5, wherein, when carrying out described sintering, the top of the described mixing bed of material is made to reach 1000-1200 DEG C, and along with the carrying out sintered, the temperature of the inside of the described mixing bed of material reaches 950-1150 DEG C, and the internal temperature having sintered rear obtained described sintered material is 650-800 DEG C.
7. method according to claim 6, wherein, the thickness of described sintered material is 35cm-50cm.
8. the method according to any one of claim 1-7, wherein, described method also comprises:
3) by described step 2) the described sintered material that obtains is broken into the agglomerate that particle diameter is 20-55mm.
9. the agglomerate that obtains of a method according to claim 8.
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| JP2016539251A (en) * | 2013-10-21 | 2016-12-15 | ケイ・ダブリュ・ジー リソーシーズ，インコーポレイテッド | Direct production of chromium iron alloys from chromite ores |
| CN103667686B (en) * | 2013-12-31 | 2015-09-09 | 四川德胜集团钒钛有限公司 | A kind of sinter mixture and application |
| CN103962568B (en) * | 2014-04-15 | 2016-06-22 | 昆明理工大学 | A kind of method of microwave heating preparation reduction chromium powder |
| 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 |
| CN105908061B (en) * | 2016-06-12 | 2018-01-02 | 江苏省冶金设计院有限公司 | A kind of method for producing high carbon ferro-chrome |
| CN107385206B (en) * | 2017-07-25 | 2019-07-05 | 中冶东方工程技术有限公司 | Ferrochrome raw material pretreatment process |
| 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 |
| CN107385205A (en) * | 2017-08-09 | 2017-11-24 | 江苏省冶金设计院有限公司 | A kind of method and system for producing silicochromium |
| CN114935264B (en) * | 2022-05-20 | 2023-06-02 | 中南大学 | Low-carbon sintering method based on biomass charcoal-hydrogen-rich gas coupling injection |
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| CN101538629A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder |
| CN102206744A (en) * | 2010-03-29 | 2011-10-05 | 攀钢集团钢铁钒钛股份有限公司 | Method for granulating sinter mixture |
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| CN1091779A (en) * | 1993-03-02 | 1994-09-07 | 锦州铁合金厂 | Technique for smelting ferrochrome using powdered Cr ore reductive sintered blocks |
| CN1313407A (en) * | 2001-01-10 | 2001-09-19 | 上海大学 | Process for preparing Cr-contained sintered ore of blast furnace from powdered chromium ore and Fe-contained raw material |
| CN101538630A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for preparing chromium iron by using chromium ore powder |
| CN101538629A (en) * | 2009-02-05 | 2009-09-23 | 丁家伟 | Process and device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder |
| CN101532068A (en) * | 2009-04-10 | 2009-09-16 | 泰州市振昌钢铁有限公司 | Blast furnace ironmaking production process by cyclically utilizing steel slag and iron slag in metallurgy and chemical industry |
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