CN205839082U - Prepare the system of ferrochrome - Google Patents
Prepare the system of ferrochrome Download PDFInfo
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- CN205839082U CN205839082U CN201620778512.5U CN201620778512U CN205839082U CN 205839082 U CN205839082 U CN 205839082U CN 201620778512 U CN201620778512 U CN 201620778512U CN 205839082 U CN205839082 U CN 205839082U
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Abstract
The utility model discloses the system preparing ferrochrome, this system includes: mixed-forming device, and it has carbonaceous material entrance, Silicon stone entrance, flux entrance, binding agent entrance, chromite powder entrance, water inlet and the outlet of mixing wet bulb group；Pelletizing drying device, it has mixing wet bulb group's entrance and dries pelletizing outlet；Rotary hearth furnace, sequentially forms cloth district, preheating zone, reducing zone and discharge zone along furnace bottom rotation direction in it, arranges drying pelletizing entrance in cloth district, and discharge zone arranges solid reduction product outlet；Cooling acidleach device, it has solid reduction product entrance, diluted acid entrance, leaches solid discharge and leachate outlet；Leached mud drying device, it has leaching residue entrance and the outlet of dry slag；Smelting apparatus, it has dry slag entrance, ferrochrome outlet and slag outlet.This system can reduce the production cost of ferrochrome while expanding the raw material sources of ferrochrome.
Description
Technical field
This utility model belongs to metallurgical technology field, and specifically, this utility model relates to a kind of ferrochrome prepared
System.
Background technology
Chromium always forms chromohercynite (FeO.Cr with ferrum symbiosis in nature2O3), its mineralogical name is ferrochrome
Ore deposit.In metallurgical industry, chromite is mainly used to produce ferrochrome.Ferrochrome produces multiple high-strength as the additive of steel
Degree, anticorrosive, wear-resisting, high temperature resistant, sludge proof special steel, such as rustless steel, acid resisting steel, heat resisting steel, ball-bearing steel, spring
Steel, tool steel etc..For the chromite ore of smelting chromium irons, except Cr2O3Grade is to weigh outside quality index, and ferrochrome ratio is also
One important indicator.Because the Ore that ferrochrome ratio is low or concentrate, even if its Cr2O3Grade higher, it is also difficult to produce high grade
Ferrochrome.Metallurgical grade ferrochrome typically requires Cr2O3The ratio of/FeO is more than 2.5.
In chromite metallurgical industry, due to lump chromite supply bottleneck (only accounting for the 20% of total resources), this just compels
Eye is turned in the application to cheap fine ore by Shi Ge producer.Therefore, the existing technology preparing ferrochrome needs further
Improve.
Utility model content
One of technical problem that this utility model is intended to solve in correlation technique the most to a certain extent.To this end, this reality
Being to propose a kind of system preparing ferrochrome by a novel purpose, this system has been broken in this area ferrochrome
The restriction of raw materials for production, thus solve the difficult problem that lean chromite cannot effectively utilize, and then ferrochrome can expanded
The production cost of ferrochrome is reduced while raw material sources.
At an aspect of the present utility model, the utility model proposes a kind of system preparing ferrochrome.According to this
The embodiment of utility model, this system includes:
Mixed-forming device, described mixed-forming device has carbonaceous material entrance, Silicon stone entrance, flux entrance, glues
Knot agent entrance, chromite powder entrance, water inlet and the outlet of mixing wet bulb group；
Pelletizing drying device, described pelletizing drying device has mixing wet bulb group's entrance and dries pelletizing outlet, described mixed
Close the outlet of entrance and described mixing wet bulb group of wet bulb group to be connected；
Rotary hearth furnace, sequentially forms cloth district, preheating zone, reducing zone and discharging along furnace bottom rotation direction in described rotary hearth furnace
District, is provided with drying pelletizing entrance in described cloth district, and described discharge zone is provided with solid reduction product outlet, described drying ball
Group's entrance is connected with the outlet of described drying pelletizing；
Cooling acidleach device, described cooling acidleach device have solid reduction product entrance, diluted acid entrance, leach residue go out
Mouth and leachate export, and described solid reduction product entrance is connected with the outlet of described solid reduction product；
Leached mud drying device, described leached mud drying device has leaching residue entrance and the outlet of dry slag, described leaching
Go out residue entrance to be connected with described leaching solid discharge；
Smelting apparatus, described smelting apparatus has dry slag entrance, ferrochrome outlet and slag outlet, described dry slag
Entrance is connected with the outlet of described dry slag.
Thus, use rotary hearth furnace to containing carbon containing thing according to the system preparing ferrochrome of this utility model embodiment
Material, Silicon stone, flux, binding agent carry out reduction roasting process, by strictly controlling rotary hearth furnace with the drying pelletizing of chromite powder
The conditions such as the temperature of interior reducing zone and atmosphere realize iron oxides and the selective reduction of chromated oxide in chromite powder so that
In chromite powder, major part iron oxides is reduced to metallic iron and cementite, and small part chromated oxide is reduced to carbonization
Chromium, then gained solid reduction product carries out acidleach process, and wherein metallic iron and cementite are dissolved by acid solution and entered leachate
In, and chromic oxide and chromium carbide are insoluble in entering in leaching residue in acid solution, such that it is able to significantly improve leaching residue
In ferrochrome ratio (ferrochrome ratio is more than 3), simultaneously the reactivity leaching residue after reduction roasting and acidleach is good, and then through follow-up
High melt process is easy for realizing ferrochrome and separates with slag, i.e. can get the higher ferrochrome of chromium content and closes
Gold, the most traditional employing metallurgical-grade chromite (ferrochrome ratio is more than 2.5) produces ferrochrome and compares, and the ferrochrome of the application is former
Material source threshold is lower, has broken the restriction to ferrochrome raw materials for production in this area, thus solve lean chromite cannot
The difficult problem effectively utilized, and then the production cost of ferrochrome can be reduced while expanding the raw material sources of ferrochrome.
It addition, can also have following additional according to the system preparing ferrochrome of this utility model above-described embodiment
Technical characteristic:
Optional, the horizontal cross-section of described rotary hearth furnace is annular, and the annulus angle of described reducing zone is more than 100
Degree.Thus, it is possible to make major part iron oxides in chromite powder be reduced to metallic iron and cementite, thus improve follow-up mistake
In journey residue obtained in ferrochrome ratio, and then the ferrochrome that chromium grade is higher can be obtained.
Optional, the reducing zone of described rotary hearth furnace is provided with exhanst gas outlet, and described exhanst gas outlet and described leached mud are dried dress
Put connected.Thus, it is possible to significantly reduce energy cost.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will be from explained below
In become obvious, or recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage are from combining general the accompanying drawings below description to embodiment
Become obvious and easy to understand, wherein:
Fig. 1 is the system structure schematic diagram preparing ferrochrome according to one embodiment of this utility model；
Fig. 2 is the part knot of the rotary hearth furnace in the system preparing ferrochrome according to this utility model further embodiment
Structure schematic diagram；
Fig. 3 is the system structure schematic diagram preparing ferrochrome according to another embodiment of this utility model；
Fig. 4 is the method stream using the system preparing ferrochrome of one embodiment of this utility model to prepare ferrochrome
Journey schematic diagram；
Fig. 5 is the method using the system preparing ferrochrome of this utility model further embodiment to prepare ferrochrome
Schematic flow sheet.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
It is exemplary for examining the embodiment that accompanying drawing describes, it is intended to be used for explaining this utility model, and it is not intended that to this utility model
Restriction.
In description of the present utility model, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward ",
Orientation or the position relationship of the instruction such as " clockwise ", " counterclockwise ", " axially ", " radially ", " circumferential " are based on shown in the drawings
Orientation or position relationship, be for only for ease of and describe this utility model and simplify description rather than instruction or the dress of hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this utility model
Restriction.
In this utility model, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.Common skill for this area
For art personnel, above-mentioned term concrete meaning in this utility model can be understood as the case may be.
In this utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score
Can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " permissible
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
At an aspect of the present utility model, the utility model proposes a kind of system preparing ferrochrome.According to this
The embodiment of utility model, with reference to Fig. 1, this system includes: mixed-forming device 100, pelletizing drying device 200, rotary hearth furnace
300, cooling acidleach device 400, leached mud drying device 500 and smelting apparatus 600.
According to embodiment of the present utility model, mixed-forming device 100 has carbonaceous material entrance 101, Silicon stone entrance
102, flux entrance 103, binding agent entrance 104, chromite powder entrance 105, water inlet 106 and mixing wet bulb roll into a ball outlet 107,
And be suitable to carbonaceous material, Silicon stone, flux, binding agent, chromite powder and water be carried out mixed-forming process, such that it is able to obtain
Mixing wet bulb group.
According to an embodiment of the present utility model, in chromite powder, ferrochrome ratio can be 1～3, i.e. in chromite powder
Cr2O3It is 1～3 with the mass ratio of FeO.Thus, the application has broken the restriction in this area to ferrochrome raw materials for production, from
And solve the difficult problem that lean chromite cannot effectively utilize, and then can reduce while expanding the raw material sources of ferrochrome
The production cost of ferrochrome.
According to further embodiment of the present utility model, the particle diameter of chromite powder is not particularly restricted, art technology
Personnel can select according to actual needs, and according to specific embodiment of the utility model, in chromite powder, particle diameter is not more than
0.074mm accounts for more than 50wt%.Thus, chromite powder and carbon have sufficient contact area to use this particle diameter can ensure that,
Thus improve the reduction efficiency of iron oxides, and then improve in subsequent process the grade of chromium in gained ferrochrome.
According to further embodiment of the present utility model, carbonaceous material, Silicon stone, flux, binding agent and chromite powder
Mixed proportion is not particularly restricted, and those skilled in the art can select according to actual needs, according to this utility model
Specific embodiment, the addition of carbonaceous material can be stoichiometry carbon requirement needed for reducing iron oxides and chromic oxide
1.0～1.5 times, the addition of Silicon stone can be the 2～10% of chromite powder weight, and the addition of binding agent can be not higher than
The 10% of chromite powder weight, the addition of flux is the 2～8% of chromite powder weight.Inventor finds, uses this ratio
Scope mixes, and is possible not only to avoid the waste of raw material, and during can ensure that sequential reduction, iron oxides is reduced
For metallic iron and the reduction efficiency of cementite.
According to another embodiment of the present utility model, the particular type of flux is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to specific embodiment of the utility model, flux can be containing carbon
Acid sodium and the mixture of limestone, such as, can be the mixture that mass ratio is 1:1～8 of sodium carbonate and limestone.Inventor
Finding, such flux can be significantly better than other and reduce reaction fusing point, thus more energy efficient.
According to another embodiment of the present utility model, the particular type of binding agent is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to specific embodiment of the utility model, binding agent can be selected from liquid
At least one in body binding agent and solid binder, such as, liquid-containing binder can be that molasses, waterglass, Colophonium, starch are molten
Liquid, synthetic resin series, paste are brilliant, solid binder can be bentonite etc..
According to embodiment of the present utility model, pelletizing drying device 200 has mixing wet bulb and rolls into a ball entrance 201 and dry pelletizing
Outlet 202, mixing wet bulb group entrance 201 107 is connected with mixing wet bulb group outlet, and is suitable to mixing wet bulb group is dried place
Reason, such that it is able to obtain drying pelletizing.Thus, it is possible to the reduction roasting efficiency in notable subsequent process.It should be noted that this
The condition of the dried in this step can be selected by skilled person according to actual needs.
According to embodiment of the present utility model, rotary hearth furnace 300 is provided with exhanst gas outlet 302, and with reference to Fig. 2, rotary hearth furnace
In sequentially form cloth district 31, preheating zone 32, reducing zone 33 and discharge zone 34 along furnace bottom rotation direction, and in cloth district 31
Being provided with drying pelletizing entrance 301, discharge zone 34 is provided with solid reduction product outlet 303, dries pelletizing entrance 301 and dries
Pelletizing outlet 202 is connected, and is suitable to above-mentioned gained drying pelletizing is sequentially passed through cloth district, preheating zone, reducing zone and discharge zone,
Carry out selective reduction, such that it is able to obtain solid reduction product and flue gas, according to a specific embodiment of the present invention, reference
Fig. 2, exhanst gas outlet 302 can be arranged on reducing zone 33.Inventor find, use rotary hearth furnace to containing carbonaceous material, Silicon stone, help
Flux, binding agent carry out reduction roasting process with the drying pelletizing of chromite powder, by reducing zone in strict control rotary hearth furnace
The condition such as temperature and atmosphere realizes iron oxides and the selective reduction of chromated oxide in chromite powder so that in chromite powder
Major part iron oxides is reduced to metallic iron and cementite, and small part chromated oxide is reduced to chromium carbide, such that it is able to
Significantly improve and subsequent process leaches the ferrochrome ratio in residue, and then obtain the ferrochrome that chromium content is higher.
According to an embodiment of the present utility model, as in figure 2 it is shown, the horizontal cross-section of rotary hearth furnace 300 can be annular,
And the annulus angle theta of reducing zone 33 is more than 100 degree.Thus, it is possible to major part iron oxides is reduced in guarantee chromite powder
For metallic iron and cementite, thus can obtain, through subsequent process, the ferrochrome that chromium content is higher.
According to further embodiment of the present utility model, reducing zone temperature is not less than 1300 degrees Celsius, and reducing zone is not
There is oxygen, drying pelletizing time of staying in rotary hearth furnace is less than 1h.Thus, it is possible to improve the reduction of iron oxides further
Efficiency.
According to embodiment of the present utility model, acidleach device 400 has solid reduction product entrance 401, diluted acid enters in cooling
Mouth 402, leaching solid discharge 403 and leachate outlet 404, solid reduction product entrance 401 and solid reduction product outlet 303
It is connected, and is suitable to diluted acid and solid reduction product are carried out acidleach process, such that it is able to obtain leaching residue and leachate.Specifically
, in rotary hearth furnace, iron oxides and the selective reduction of chromated oxide in chromite powder so that major part ferrum in chromite powder
Oxide is reduced to metallic iron and cementite, and small part chromated oxide is reduced to chromium carbide, and then gained contains metal
The solid reduction product of ferrum, cementite, chromium carbide and chromic oxide carries out acidleach process, and wherein metallic iron and cementite are sour
Liquid dissolves and enters in leachate, and chromic oxide and chromium carbide are insoluble in entering in leaching residue in acid solution, thus can
Significantly improving the ferrochrome ratio (ferrochrome ratio is more than 3) leached in residue, after reduction roasting and acidleach, leach residue simultaneously
Reactive good, and then process through subsequent high temperature melting and be easy for realizing ferrochrome and separate with slag, the most available
The ferrochrome that chromium content is higher.
According to an embodiment of the present utility model, diluted acid can be dilute sulfuric acid, and the mass concentration of this dilute sulfuric acid can
Think 5～15%.Inventor finds, the dilute sulfuric acid of this concentration range can be substantially better than other concentration and improve metallic iron and carbonization
The acidleach effect of ferrum.
According to embodiment of the present utility model, leached mud drying device 500 has leaching residue entrance 501 and dry slag goes out
Mouth 502, leaches residue entrance 501 and is connected with leaching solid discharge 403, and is suitable to do above-mentioned obtained leaching residue
Dry process, such that it is able to obtain being dried slag.Thus, it is possible to the smelting efficiency significantly improved in subsequent process.It should be noted that
Dried condition during this can be selected by those skilled in the art according to actual needs.
According to embodiment of the present utility model, smelting apparatus 600 has dry slag entrance 601, ferrochrome outlet 602 and
Slag outlet 603, is dried slag entrance 601 and is connected with dry slag outlet 502, and be suitable to dry slag is carried out high melt, thus
Can obtain ferrochrome and slag, wherein in gained ferrochrome, chromium grade is more than 60%.
The system preparing ferrochrome according to this utility model embodiment uses rotary hearth furnace to containing carbonaceous material, silicon
Stone, flux, binding agent carry out reduction roasting process with the drying pelletizing of chromite powder, by reducing in strict control rotary hearth furnace
The conditions such as the temperature in district and atmosphere realize iron oxides and the selective reduction of chromated oxide in chromite powder so that chromite
In powder, major part iron oxides is reduced to metallic iron and cementite, and small part chromated oxide is reduced to chromium carbide, then
Gained solid reduction product carries out acidleach process, and wherein metallic iron and cementite are dissolved by acid solution and entered in leachate, and three
Aoxidize two chromium and chromium carbide to leach in residue insoluble in acid solution enters, such that it is able to significantly improve the ferrochrome leached in residue
Ratio (ferrochrome ratio is more than 3), the reactivity leaching residue after reduction roasting and acidleach is good simultaneously, and then through subsequent high temperature melting
Process is easy for realizing ferrochrome and separates with slag, i.e. can get the ferrochrome that chromium content is higher, the most relatively
Traditional employing metallurgical-grade chromite (ferrochrome ratio is more than 2.5) produces ferrochrome and compares, the ferrochrome raw material sources door of the application
Sill are lower, broken the restriction to ferrochrome raw materials for production in this area, thus solved lean chromite and cannot effectively utilize
A difficult problem, and then the production cost of ferrochrome can be reduced while expanding the raw material sources of ferrochrome.
With reference to Fig. 3, according to embodiment of the present utility model, exhanst gas outlet 302 is connected with leached mud drying device 500, and
Be suitable to the flue gas that obtain in rotary hearth furnace supply to leached mud drying device to use as the dry medium leaching residue.By
This, can significantly reduce energy cost.
As it has been described above, close the system of alloy can have selected from following excellent according to the ferrochrome of preparing of this utility model embodiment
At least one point:
The system preparing ferrochrome conjunction alloy according to this utility model embodiment can process lean chromite, has broken metallurgical grade
Chromite is to Cr2O3The restriction of the ratio of/FeO, makes the lean chromite that cannot function as metallurgical raw material utilization under current technical conditions obtain
Arrive effective utilization；
According to this utility model embodiment prepare ferrochrome close alloy system can more efficient process metallurgical-grade chromite, carry
High Cr2O3The ratio of/FeO, obtains the pretreatment acid leaching residue of high chrome contents；
Obtained by the system preparing ferrochrome conjunction alloy of this utility model embodiment after reduction roasting-acidleach
Leaching residue reactivity good, send into conventional smelting furnace and carry out melting, easily make ferrochrome block separate with smelting slag, obtain
The ferrochrome block of more than 60% chromium content；
The system preparing ferrochrome conjunction alloy according to this utility model embodiment, by using specific flux, makes to turn the end
Furnace temperature reduces 50～100 DEG C than expection, thus reduces energy resource consumption.
Understand for convenience, below with reference to the Figure 4 and 5 system to using this utility model embodiment to prepare ferrochrome
The method preparing ferrochrome is described in detail.According to embodiment of the present utility model, the method includes:
S100: the supply of carbonaceous material, Silicon stone, flux, binding agent, chromite powder and water is carried out to mixed-forming device
Mixed-forming processes
According to embodiment of the present utility model, carbonaceous material, Silicon stone, flux, binding agent, chromite powder and water are supplied
Mixed-forming process is carried out, such that it is able to obtain mixing wet bulb group to mixed-forming device.
According to an embodiment of the present utility model, in chromite powder, ferrochrome ratio can be 1～3, i.e. in chromite powder
Cr2O3It is 1～3 with the mass ratio of FeO.Thus, the application has broken the restriction in this area to ferrochrome raw materials for production, from
And solve the difficult problem that lean chromite cannot effectively utilize, and then can reduce while expanding the raw material sources of ferrochrome
The production cost of ferrochrome.
According to further embodiment of the present utility model, the particle diameter of chromite powder is not particularly restricted, art technology
Personnel can select according to actual needs, and according to specific embodiment of the utility model, in chromite powder, particle diameter is not more than
0.074mm accounts for more than 50wt%.Thus, chromite powder and carbon have sufficient contact area to use this particle diameter can ensure that,
Thus improve the reduction efficiency of iron oxides, and then improve in subsequent process the grade of chromium in gained ferrochrome.
According to further embodiment of the present utility model, carbonaceous material, Silicon stone, flux, binding agent and chromite powder
Mixed proportion is not particularly restricted, and those skilled in the art can select according to actual needs, according to this utility model
Specific embodiment, the addition of carbonaceous material can be stoichiometry carbon requirement needed for reducing iron oxides and chromic oxide
1.0～1.5 times, the addition of Silicon stone can be the 2～10% of chromite powder weight, and the addition of binding agent can be not higher than
The 10% of chromite powder weight, the addition of flux is the 2～8% of chromite powder weight.Inventor finds, uses this ratio
Scope mixes, and is possible not only to avoid the waste of raw material, and during can ensure that sequential reduction, iron oxides is reduced
For metallic iron and the reduction efficiency of cementite.
According to another embodiment of the present utility model, the particular type of flux is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to specific embodiment of the utility model, flux can be containing carbon
Acid sodium and the mixture of limestone, such as, can be the mixture that mass ratio is 1:1～8 of sodium carbonate and limestone.Inventor
Finding, such flux can be significantly better than other and reduce reaction fusing point, thus more energy efficient.
According to another embodiment of the present utility model, the particular type of binding agent is not particularly restricted, this area skill
Art personnel can select according to actual needs, and according to specific embodiment of the utility model, binding agent can be selected from liquid
At least one in body binding agent and solid binder, such as, liquid-containing binder can be that molasses, waterglass, Colophonium, starch are molten
Liquid, synthetic resin series, paste are brilliant, solid binder can be bentonite etc..
S200: the supply of mixing wet bulb group is dried process to pelletizing drying device
According to embodiment of the present utility model, the supply of mixing wet bulb group is dried process to pelletizing drying device, from
And can obtain drying pelletizing.Thus, it is possible to the reduction roasting efficiency in notable subsequent process.It should be noted that this area
The condition of the dried in this step can be selected by technical staff according to actual needs.
S300: the supply of drying pelletizing is carried out selective reduction to rotary hearth furnace
According to embodiment of the present utility model, above-mentioned gained drying pelletizing is sequentially passed through cloth district, preheating zone, reducing zone
And discharge zone, carry out selective reduction, such that it is able to obtain solid reduction product and flue gas.Inventor finds, uses rotary hearth furnace
Reduction roasting process is carried out, by sternly with the drying pelletizing of chromite powder to containing carbonaceous material, Silicon stone, flux, binding agent
Lattice control the conditions such as temperature and the atmosphere of reducing zone in rotary hearth furnace and realize iron oxides and the choosing of chromated oxide in chromite powder
Selecting property is reduced so that in chromite powder, major part iron oxides is reduced to metallic iron and cementite, and small part chromated oxide
It is reduced to chromium carbide, such that it is able to significantly improve, subsequent process leaches the ferrochrome ratio in residue, and then obtain chromium content relatively
High ferrochrome.
According to an embodiment of the present utility model, reducing zone temperature is not less than 1300 degrees Celsius, and reducing zone is not deposited
At oxygen, drying pelletizing time of staying in rotary hearth furnace is less than 1h.Thus, it is possible to improve the reduction effect of iron oxides further
Rate.
S400: diluted acid and solid reduction product are supplied extremely cooling acidleach device and carries out acidleach process
According to embodiment of the present utility model, diluted acid and above-mentioned obtained solid reduction product are supplied to cooling down acidleach
Device carries out acidleach process, such that it is able to obtain leaching residue and leachate.Concrete, in rotary hearth furnace, ferrum in chromite powder
Oxide and the selective reduction of chromated oxide so that in chromite powder, major part iron oxides is reduced to metallic iron and carbonization
Ferrum, and small part chromated oxide is reduced to chromium carbide, then gained contains metallic iron, cementite, chromium carbide and three oxidations two
The solid reduction product of chromium carries out acidleach process, and wherein metallic iron and cementite are dissolved by acid solution and entered in leachate, and three
Aoxidize two chromium and chromium carbide to leach in residue insoluble in acid solution enters, such that it is able to significantly improve the ferrochrome leached in residue
Ratio (ferrochrome ratio is more than 3), the reactivity leaching residue after reduction roasting and acidleach is good simultaneously, and then through subsequent high temperature melting
Process is easy for realizing ferrochrome and separates with slag, i.e. can get the ferrochrome that chromium content is higher.
According to an embodiment of the present utility model, diluted acid can be dilute sulfuric acid, and the mass concentration of this dilute sulfuric acid can
Think 5～15%.Inventor finds, the dilute sulfuric acid of this concentration range can be substantially better than other concentration and improve metallic iron and carbonization
The acidleach effect of ferrum.
S500: the supply of leaching residue is dried process to leached mud drying device
According to embodiment of the present utility model, the supply of leaching residue is dried process to leached mud drying device, from
And can obtain being dried slag.Thus, it is possible to the smelting efficiency significantly improved in subsequent process.It should be noted that this area skill
Dried condition during this can be selected by art personnel according to actual needs.
S600: the supply of dry slag is carried out high melt to smelting apparatus
According to embodiment of the present utility model, the dry slag supply obtained by above-mentioned is carried out high temperature melting to smelting apparatus
Refining, such that it is able to obtain ferrochrome and slag, wherein in gained ferrochrome, chromium grade is more than 60%.
The system preparing ferrochrome according to this utility model embodiment is prepared the method for ferrochrome and is used rotary hearth furnace
Reduction roasting process is carried out, by sternly with the drying pelletizing of chromite powder to containing carbonaceous material, Silicon stone, flux, binding agent
Lattice control the conditions such as temperature and the atmosphere of reducing zone in rotary hearth furnace and realize iron oxides and the choosing of chromated oxide in chromite powder
Selecting property is reduced so that in chromite powder, major part iron oxides is reduced to metallic iron and cementite, and small part chromated oxide
Being reduced to chromium carbide, then gained solid reduction product carries out acidleach process, and wherein metallic iron and cementite are dissolved by acid solution
And enter in leachate, and chromic oxide and chromium carbide are insoluble in entering in leaching residue in acid solution, such that it is able to significantly
Improve the ferrochrome ratio (ferrochrome ratio is more than 3) leached in residue, simultaneously the reactivity leaching residue after reduction roasting and acidleach
Good, and then process through subsequent high temperature melting and be easy for realizing ferrochrome and separate with slag, i.e. can get chromium content
Higher ferrochrome, the most traditional employing metallurgical-grade chromite (ferrochrome ratio is more than 2.5) produces ferrochrome and compares, this
The ferrochrome raw material sources threshold of application is lower, has broken the restriction to ferrochrome raw materials for production in this area, thus has solved
The difficult problem that lean chromite cannot effectively utilize, and then ferrochrome can be reduced while expanding the raw material sources of ferrochrome
Production cost.
With reference to Fig. 5, the method using the system preparing ferrochrome of this utility model embodiment to prepare ferrochrome is entered
One step includes:
S700: the flue gas obtained in rotary hearth furnace during S300 is supplied to the leached mud drying device of S500 as leaching
The dry medium going out residue uses
In this step, the flue gas supply obtained in rotary hearth furnace during S300 is made to the leached mud drying device of S500
Use for leaching the dry medium of residue.Thus, it is possible to significantly reduce energy cost.
Below with reference to specific embodiment, this utility model is described, it should be noted that these embodiments are only
Illustrative, and limit this utility model never in any form.
Embodiment 1
With chromite as raw material, wherein, Cr2O3Content is 35.47wt%, Cr2O3/ FeO=2.1, chromite is levigate
Accounting for 65% to-200 mesh, the Silicon stone amount of allocating into is the 6% of chromite weight, carbon with addition of amount according to 1.1 times of stoichiometric requirement,
The amount of allocating into accounts for the binding agent (binding agent contains bentonite and molasses) of the 9% of chromite powder quality, allocates into and accounts for chromite powder quality
3% flux (flux contains limestone and Na2CO3, and Na2CO3It is 1:5 with the part by weight of limestone), material
Mixing pelletizing, obtains the mixing wet bulb group of pelletizing a diameter of 10～14mm, the drying ball that gained mixing wet bulb group obtains after drying
Group is distributed into rotary hearth furnace, and in stove, maximum temperature is set as 1300 DEG C, and pelletizing is discharged with spiral discharging machine after furnace reduction 60min and turned
End stove, banks up pelletizing and leaches with the dilute sulfuric acid that mass concentration is 12%, and gained leaches Cr in residue2O3/ FeO is 3.3, so
After rear feeding smelting furnace slag sluicing system, obtain chromium content more than 60% ferrochrome.
Embodiment 2
With chromite as raw material, wherein, Cr2O3Content is 38.15wt%, Cr2O3/ FeO=1.95, chromite is levigate
Accounting for 75% to-200 mesh, the Silicon stone amount of allocating into is the 8% of chromite weight, carbon with addition of amount according to 1.2 times of stoichiometric requirement,
The amount of allocating into accounts for the bentonite of the 8% of chromite powder quality, allocate into account for chromite powder quality 7% flux (flux contains
Limestone and Na2CO3, and Na2CO3It is 1:4 with the part by weight of limestone), material mixing pelletizing, obtain pelletizing a diameter of
The mixing wet bulb group of 10～14mm, the drying pelletizing that gained mixing wet bulb group obtains after drying is distributed into rotary hearth furnace, the highest temperature in stove
Degree is set as 1380 DEG C, and pelletizing discharges rotary hearth furnace with spiral discharging machine after furnace reduction 30min, is banked up by pelletizing and uses quality
Concentration is the dilute sulfuric acid leaching of 6%, and gained leaches Cr in residue2O3/ FeO is 3.1, after being then fed into smelting furnace slag sluicing system,
To chromium content more than 60% ferrochrome.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, this area
Technical staff the feature of the different embodiments described in this specification or example and different embodiment or example can be entered
Row combines and combination.
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
In above-described embodiment can be changed, revise, replace and modification.
Claims (3)
1. the system preparing ferrochrome, it is characterised in that including:
Mixed-forming device, described mixed-forming device has carbonaceous material entrance, Silicon stone entrance, flux entrance, binding agent
Entrance, chromite powder entrance, water inlet and the outlet of mixing wet bulb group；
Pelletizing drying device, described pelletizing drying device has mixing wet bulb group's entrance and dries pelletizing outlet, and described mixing is wet
Pelletizing entrance exports with described mixing wet bulb group and is connected；
Rotary hearth furnace, sequentially forms cloth district, preheating zone, reducing zone and discharge zone along furnace bottom rotation direction in described rotary hearth furnace,
Be provided with drying pelletizing entrance in described cloth district, described discharge zone is provided with solid reduction product outlet, described drying pelletizing
Entrance is connected with the outlet of described drying pelletizing；
Cooling acidleach device, described cooling acidleach device have solid reduction product entrance, diluted acid entrance, leach solid discharge and
Leachate exports, and described solid reduction product entrance is connected with the outlet of described solid reduction product；
Leached mud drying device, described leached mud drying device has leaching residue entrance and the outlet of dry slag, and described leaching is residual
Slag entrance is connected with described leaching solid discharge；
Smelting apparatus, described smelting apparatus has dry slag entrance, ferrochrome outlet and slag outlet, described dry slag entrance
It is connected with the outlet of described dry slag.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described rotary hearth furnace is annular, and institute
State the annulus angle of reducing zone more than 100 degree.
System the most according to claim 1 and 2, it is characterised in that described rotary hearth furnace is provided with exhanst gas outlet, described flue gas goes out
Mouth is connected with described leached mud drying device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105969978A (en) * | 2016-07-22 | 2016-09-28 | 江苏省冶金设计院有限公司 | System and method for preparing ferrochrome |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105969978A (en) * | 2016-07-22 | 2016-09-28 | 江苏省冶金设计院有限公司 | System and method for preparing ferrochrome |
| CN105969978B (en) * | 2016-07-22 | 2018-08-21 | 江苏省冶金设计院有限公司 | The system and method for preparing ferrochrome |
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