CN106282468A - A kind of reduction reaction system and method for fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group - Google Patents
A kind of reduction reaction system and method for fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group Download PDFInfo
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- CN106282468A CN106282468A CN201610819140.0A CN201610819140A CN106282468A CN 106282468 A CN106282468 A CN 106282468A CN 201610819140 A CN201610819140 A CN 201610819140A CN 106282468 A CN106282468 A CN 106282468A
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- temperature
- rotary hearth
- nickel ore
- temperature reduction
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
Abstract
The present invention relates to chemical industry metallurgical field, be specifically related to the system and method for a kind of reduction reaction processing lateritic nickel ore.For the deficiencies in the prior art, the present invention proposes the reduction reaction system and method for a kind of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.In this system, the preheating zone of novel rotary hearth furnace uses and adds heat pipes heat, for burner heats, neither affects whole reducing process, the problem that can solve again preheating zone fume amount big blocking burner, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.And, flue is located at low-temperature reduction district by described novel rotary hearth furnace, the flue gas produced adds the thermal source of heat pipe after dedusting directly as preheating zone and low-temperature reduction district, the fume afterheat achieving furnace interior generation can effectively be recycled, thus, this system achieves environmental protection, indirectly reduces process energy consumption and cost.
Description
Technical field
The present invention relates to chemical industry metallurgical field.In particular it relates to a kind of reduction reaction processing lateritic nickel ore
System and method.
Background technology
In recent years, along with the exhausted of high-grade nickel sulfide ore and the fast development of domestic rustless steel industry, low-grade laterite
Nickel minerals has become as the primary raw material producing ferro-nickel product.In order to solve the Rational Utilization of lateritic nickel ore, with lateritic nickel ore
For raw material, coal dust is reducing agent, uses direct-reduction process that the ferrum in Ore and nickel have been reduced into metallic iron and metallic nickel, then warp
Superfusion point or mill choosing make nickel be enriched in ferro-nickel product.
Now, coal-based DR process has multiple, and wherein, owing to rotary hearth furnace reduction technique has, equipment is simple, operation
Easily, with short production cycle, response speed fast, advantages of environment protection, so rotary hearth furnace reduction technique has caused widely
Pay close attention to.The ultimate principle of rotary hearth iron making is that the high temperature of flame is passed by radiation by being positioned at the burning of the flat flame burner of furnace sidewall
To the pelletizing on bed of material surface, the metal-oxide in carbonaceous pelletizing is made at high temperature to be reduced, heating energy source many employings natural gas,
Cracked gas, coke-stove gas, coal gas of converter and coal gas etc., energy sources is quite varied.Use rotary hearth furnace equipment DRI
(DRI) technique mainly comprises the steps that and Iron Ore Powder is mixed homogeneously with reducing agent coal dust, is pressed into carbonaceous pelletizing ore deposit, dries；
Dry carbonaceous pelletizing is layered on rotary hearth furnace equably, make carbonaceous pelletizing reduced zone in rotary hearth furnace (temperature up to
1300 DEG C-1400 DEG C) in be reduced 15min-30min, i.e. can get the metallized pellet that degree of metalization is more than 85%.Turn the end
Furnace apparatus is for the advantage producing DRI, the transfixion that reduction temperature is high, the time is short, furnace charge is relative with furnace bottom holding, from
And avoid the problems such as rotary kiln, fluid bed bonding, shaft furnace dross.Chinese patent CN102212636A discloses a kind of laterite nickel
The iron smelting method that point stove melts point is melted in ore deposit rotary hearth furnace coal-based direct reduction combustion gas, makes after being mixed with coal and flux by lateritic nickel ore
Ball, dry bulb carries out direct-reduction and obtains metallized pellet in being distributed into rotary hearth furnace, metallized pellet feeding coal gas makees the storage of fuel
The molten point stove of hot type combustion gas carries out molten point, finally gives nickelic dilval.
In prior art, rotary hearth furnace includes preheating section, reduction section and three sections of cooling section (or omitting cooling section).Enter
Material mouth is positioned at the preheating section of rotary hearth furnace, and is arranged on the annular space top of rotary hearth furnace.Discharging opening is positioned at the cooling section of rotary hearth furnace,
And it is arranged on the bottom of rotary hearth furnace.Carbonaceous pelletizing loads the bottom of the annular space of rotary hearth furnace from rotary hearth furnace charging aperture, enters stove
Carbonaceous pelletizing turns round through rotary hearth furnace, revolves one-turn and gradually completes reduction process, finally discharges metallized pellet from discharging opening.Existing
Rotary hearth furnace is had to process in lateritic nickel ore technology, during lateritic nickel ore pelletizing is distributed into rotary hearth furnace after drying, owing to cloth mouth exists
There is certain difference in height, so whole whereabouts cloth process is particularly easy to fragmentation also in the annular space top of rotary hearth furnace and furnace bottom
Forming volume of smoke, these flue dust will block the burner of preheating zone, affects the life-span of burner, even affects whole life time serious
Produce.Additionally, existing rotary hearth furnace processes in lateritic nickel ore technology and will enter stove pelletizing and be rapidly heated 1300 DEG C of smeltings carried out above, have
The shortcoming that Energy input is superfluous.Therefore, existing rotary hearth furnace process lateritic nickel ore technology is further improved.
Summary of the invention
Process, for existing rotary hearth furnace, the volume of smoke that in lateritic nickel ore technology, lateritic nickel ore dry bulb cloth process produces to block up
Plug preheating zone burner and the problem of existing rotary hearth furnace energy dissipation, the present invention proposes a kind of fume afterheat furnace interior recycling
The reduction reaction system and method for type lateritic nickel ore dry bulb group, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.In this system newly
The preheating zone of type rotary hearth furnace uses and adds heat pipes heat, for burner heats, neither affects whole reducing process, can solve again
The certainly problem of preheating zone fume amount big blocking burner, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.Further, described novel the end is turned
Flue is located at low-temperature reduction district by stove, and the flue gas of generation adds heat pipe directly as preheating zone and low-temperature reduction district after dedusting
Thermal source, it is achieved that the fume afterheat that furnace interior produces can effectively be recycled, thus, this system achieves environmental protection,
Indirectly reduce process energy consumption and cost.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The invention provides the reduction reaction system of a kind of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group, it is special
Levy and be, including: dispensing mixing device, shaped device, drying device, novel rotary hearth furnace, slag sluicing system device and flue gas ash removal
Device, wherein:
Described dispensing mixing device includes: lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material outlet, uses
In lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, obtain mixed material；
Described shaped device includes: mixed material entrance and mixing pelletizing outlet, described mixed material entrance and described mixture
Material outlet is connected, and for described mixed material is shaped process, obtains mixing pelletizing；
Described drying device includes: mixing pelletizing entrance and the outlet of dry bulb group, described mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and for described mixing pelletizing is dried process, obtains dry bulb group；
Described novel rotary hearth furnace includes: the most adjacent feed zone, preheating zone, low-temperature reduction district, high temperature reduction district and discharge zone,
Wherein, described feed zone furnace wall is provided with dry bulb group entrance, and described dry bulb group entrance exports with described dry bulb group and is connected, described pre-
Furnace wall, hot-zone is provided with and adds heat pipe high-temperature dust removal smoke inlet, and furnace wall, described low-temperature reduction district is provided with and adds heat pipe high-temperature dust removal cigarette
Gas entrance and high-temperature flue gas outlet, be provided with inside the furnace wall in described preheating zone and described low-temperature reduction district and multiple add heat pipe, be used for
Described preheating zone and described low-temperature reduction district are added heat pipe mode heat, be provided with multiple inside furnace wall, described high temperature reduction district
Burner, for described high temperature reduction district carries out burner mode heating, furnace wall, described discharge zone is provided with metallized pellet outlet；
Described rotary hearth furnace uses zone heating mode, described preheating zone and the employing of described low-temperature reduction district to add heat pipe mode and heat,
Described high temperature reduction district uses burner mode to heat；
Described slag sluicing system device includes: the outlet of metallized pellet entrance, ferro-nickel product and tailings outlet, described metallized pellet
Entrance is connected with the outlet of described metallized pellet, for described metallized pellet is carried out slag sluicing system process, obtains ferronickel and produces
Product and tailings；
Described fume dust remover includes: high-temperature flue gas entry and high-temperature dust removal exhanst gas outlet, described high-temperature flue gas entry and institute
The high-temperature flue gas outlet stating novel rotary hearth furnace is connected, and for high-temperature flue gas is carried out dust removal process, obtains high-temperature dust removal flue gas, institute
State high-temperature dust removal exhanst gas outlet respectively with described preheating zone and described low-temperature reduction district add heat pipe high-temperature dust removal smoke inlet phase
Even, for using described high-temperature dust removal flue gas as the thermal source adding heat pipe, heat the preheating zone of described novel rotary hearth furnace and low temperature also
The material in former district.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, novel rotary hearth furnace in this system
Preheating zone use add heat pipes heat, relative to burner heat for, neither affect whole reducing process, preheating zone can be solved again
The problem of fume amount big blocking burner, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.Further, described novel rotary hearth furnace is by flue
Being located at low-temperature reduction district, the flue gas of generation adds the thermal source of heat pipe after dedusting directly as preheating zone and low-temperature reduction district, real
The fume afterheat having showed furnace interior generation can effectively be recycled, thus, this system achieves environmental protection, indirectly reduces
Process energy consumption and cost.
According to embodiments of the invention, the horizontal cross-section of described novel rotary hearth furnace is annular, the annulus of described preheating zone
Angle 30-90.
According to embodiments of the invention, the horizontal cross-section of described novel rotary hearth furnace is annular, described low-temperature reduction district
Annulus angle 100-150.
According to embodiments of the invention, the horizontal cross-section of described novel rotary hearth furnace is annular, described high temperature reduction district
Annulus angle 100-200.
In another aspect of the present invention, the invention provides and a kind of utilize foregoing system to carry out lateritic nickel ore
The method of reduction reaction, it is characterised in that comprise the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, in order to mixed
Compound material；
(2) mixed material adds shaped device be shaped processing, in order to obtain mixing pelletizing；
(3) mixing pelletizing addition drying device is dried process, in order to obtain dry bulb group；
(4) dry bulb group is joined novel rotary hearth furnace and carry out reduction melting process, in order to obtain metallized pellet；
(5) metallized pellet is added slag sluicing system device and carry out slag sluicing system process, in order to obtain ferro-nickel product and tailings.
According to embodiments of the invention, the granularity of lateritic nickel ore, reduction coal and additive in described step (1) is 100
Below mesh.
According to embodiments of the invention, the additive in described step (1) be selected from alkali metal oxide, alkali metal salt,
At least one in alkaline earth oxide and alkali salt.
According to embodiments of the invention, the weight proportion of lateritic nickel ore, reduction coal and additive in described step (1) is
Lateritic nickel ore: reduction coal: additive=100:5-25:3-15.
According to embodiments of the invention, in described step (4), dry bulb group at the reaction condition of novel rotary hearth furnace is: preheating zone
Temperature 700-900 DEG C, time of staying 5-15min；Low-temperature reduction district temperature 1000 DEG C-1150 DEG C, time of staying 10-20min；High
Temperature reducing zone temperature 1200-1400 DEG C, time of staying 10-20min.
The beneficial effects of the present invention is:
(1) the reduction reaction system of the fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group that the present invention provides and side
Method, the preheating zone of novel rotary hearth furnace uses and adds heat pipes heat, for burner heats, neither affects whole reducing process,
The problem that can solve again preheating zone fume amount big blocking burner.
(2) present invention provide fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group reduction reaction system and
Method, flue is located at low-temperature reduction district by described novel rotary hearth furnace, the flue gas of generation after dedusting directly as preheating zone and
Low-temperature reduction district adds the thermal source of heat pipe, it is achieved that the fume afterheat that furnace interior produces can effectively be recycled, thus, this is
System achieves environmental protection, indirectly reduces process energy consumption and cost.
(3) present invention provide fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group reduction reaction system and
Method, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted, reduces energy consumption 10% compared with conventional rotary hearth furnace process lateritic nickel ore technology
~20%。
Accompanying drawing explanation
Fig. 1 is the structure of the reduction reaction system of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb of the present invention group
Figure.
Fig. 2 is the simple of the reduction reaction system of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb of the present invention group
Figure.
Fig. 3 is the work of the reduction reaction system of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb of the present invention group
Flow chart.
Wherein, 10, add heat pipe, 20, burner, 30, flue, 100, dispensing mixing device, 101, lateritic nickel ore entrance, 102,
Reduction coal entrance, 103, additive entrance, 104, mixed material outlet, 200, shaped device, 201, mixed material entrance, 202,
Mixing pelletizing outlet, 300, drying device, 301, mixing pelletizing entrance, 302, the outlet of dry bulb group, 400, novel rotary hearth furnace, 401,
Dry bulb group's entrance, 402, add heat pipe high-temperature dust removal smoke inlet, 403, metallized pellet outlet, 404, high-temperature flue gas outlet,
500, slag sluicing system device, 501, metallized pellet entrance, 502, ferro-nickel product outlet, 503, tailings outlet, 600, flue gas removes
Dirt device, 601, high-temperature flue gas entry, 602, high-temperature dust removal exhanst gas outlet.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, and is not understood that
For limitation of the present invention.Unreceipted concrete technology or condition in embodiment, according to the skill described by the document in this area
Art or condition or carry out according to product description.
According to an aspect of the present invention, the reduction of a kind of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group
Response system, its structure is as it is shown in figure 1, include: dispensing mixing device 100, shaped device 200, drying device 300, novel turn
End stove 400, slag sluicing system device 500 and fume dust remover 600.Fig. 2 is fume afterheat furnace interior recycling type of the present invention
The simple diagram of the reduction reaction system of lateritic nickel ore dry bulb group, as it can be seen, described dispensing mixing device includes: lateritic nickel ore enters
Mouth 101, reduction coal enter 102, additive entrance 103 and mixed material outlet 104, for by lateritic nickel ore, reduction coal and interpolation
Agent carries out dispensing mixing treatment, obtains mixed material；Described shaped device includes: mixed material entrance 201 and mixing pelletizing go out
Mouth 202, described mixed material entrance is connected with the outlet of described mixed material, for described mixed material being shaped process,
Obtain mixing pelletizing；Described drying device includes: mixing pelletizing entrance 301 and the outlet 302 of dry bulb group, described mixing pelletizing entrance
It is connected with the outlet of described mixing pelletizing, for described mixing pelletizing is dried process, obtains dry bulb group；Described novel turn the end
Stove includes: the most adjacent feed zone, preheating zone, low-temperature reduction district, high temperature reduction district and discharge zone, wherein, and described rotary hearth furnace
Using zone heating mode, described preheating zone and the employing of described low-temperature reduction district to add heat pipe mode and heat, described high temperature is also
Former district uses burner mode to heat；Described slag sluicing system device includes: metallized pellet entrance 501, ferro-nickel product export
502 and tailings outlet 503, the outlet of described metallized pellet entrance and described metallized pellet is connected；Described fume dust remover
Including: high-temperature flue gas entry 601 and high-temperature dust removal exhanst gas outlet 602, described high-temperature flue gas entry and described novel rotary hearth furnace
High-temperature flue gas outlet is connected, described high-temperature dust removal exhanst gas outlet respectively with described preheating zone and described low-temperature reduction district add heat pipe
High-temperature dust removal smoke inlet is connected.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, novel rotary hearth furnace in this system
Preheating zone use add heat pipes heat, relative to burner heat for, neither affect whole reducing process, preheating zone can be solved again
The problem of fume amount big blocking burner, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.Further, described novel rotary hearth furnace is by flue
Being located at low-temperature reduction district, the flue gas of generation adds the thermal source of heat pipe after dedusting directly as preheating zone and low-temperature reduction district, real
The fume afterheat having showed furnace interior generation can effectively be recycled, thus, this system achieves environmental protection, indirectly reduces
Process energy consumption and cost.
According to a particular embodiment of the invention, described novel rotary hearth furnace includes: the most adjacent feed zone, preheating zone, low
Temperature reducing zone, high temperature reduction district and discharge zone.In some embodiments of the invention, described feed zone furnace wall is provided with dry bulb group
Entrance 401, the outlet of entrance and described dry bulb group of described dry bulb group is connected, and described dry bulb group entrance is described in add dry bulb group
React in novel rotary hearth furnace；Furnace wall, described preheating zone is provided with and adds heat pipe high-temperature dust removal smoke inlet 402, for adding
Heat pipe high-temperature dust removal flue gas delivers into adding in heat pipe of described rotary hearth furnace and heats；Furnace wall, described low-temperature reduction district is provided with
Add heat pipe high-temperature dust removal smoke inlet 402 and high-temperature flue gas outlet 404, described in add heat pipe high-temperature dust removal smoke inlet for adding
Heat pipe high-temperature dust removal flue gas delivers into described adding in heat pipe of novel rotary hearth furnace and heats, and the outlet of described high-temperature flue gas is used for
The high-temperature flue gas produced in the low-temperature reduction district of described novel rotary hearth furnace is discharged；Furnace wall, described discharge zone is provided with metallized pellet
Outlet 403, for discharging metallized pellet.
According to a particular embodiment of the invention, the concrete shape of described novel rotary hearth furnace is not particularly limited, as long as can
Realize lateritic nickel ore dry bulb group is carried out reduction reaction.In some embodiments of the invention, described novel rotary hearth furnace
Horizontal cross-section is annular, and, the annulus angle shared by each district is not particularly limited.Preferably, the circle of described preheating zone
Ring angle 30-90, the annulus angle 100-150 in described low-temperature reduction district, the annulus angle 100 in described high temperature reduction district-
200, it is ensured that good reduction effect.
According to a particular embodiment of the invention, the mode of heating in the preheating zone of described novel rotary hearth furnace and low-temperature reduction district is not
It is particularly limited, as long as hot charge can be added.In some embodiments of the invention, described preheating zone and described low temperature
Reducing zone uses and adds the mode of heat pipe and heat, further, described in add heat pipe 10 and may be mounted at described preheating zone and institute
State inside the furnace wall in low-temperature reduction district, can arrange and multiple add heat pipe 10.In some embodiments of the invention, heat pipe is added described in
Including body and internal heat resource, being that internal heat resource first heats body to hot mode, body transfers heat in stove again, and this
Process is not to furnace atmosphere disturbance.The preheating zone of described novel rotary hearth furnace uses and adds heat pipes heat, for burner heats,
Neither affect whole reducing process, the problem that preheating zone fume amount big blocking burner can be solved again.Thus, it is achieved that to described pre-
The raw material in hot-zone and described low-temperature reduction district heats.
According to a particular embodiment of the invention, the mode of heating in the high temperature reduction district of described novel rotary hearth furnace is not by concrete
Limit, as long as hot charge can be added.In some embodiments of the invention, described high temperature reduction district uses the mode of burner
Heating, further, described burner 20 may be mounted at inside the furnace wall in described high temperature reduction district, can arrange multiple burning
Mouth 20.In some embodiments of the invention, the heat using burner combustion to produce passes to by the way of radiant heat transfer
Pelletizing.Because the burning of burner naked light has the advantage (up to 1500 DEG C) that burning capacity is big, heating-up temperature is high, thus, it is achieved that
The raw material in described high temperature reduction district is heated.
According to a particular embodiment of the invention, this system also includes described fume dust remover, for entering high-temperature flue gas
Row dust removal process, obtains high-temperature dust removal flue gas.In some embodiments of the invention, described fume dust remover includes: high temperature
Smoke inlet and high-temperature dust removal exhanst gas outlet, described high-temperature flue gas entry exports phase with the high-temperature flue gas of described novel rotary hearth furnace
Even, for high-temperature flue gas is carried out dust removal process, obtaining high-temperature dust removal flue gas, described high-temperature dust removal exhanst gas outlet is respectively with described
Preheating zone is connected with the heat pipe high-temperature dust removal smoke inlet that adds in described low-temperature reduction district, for using described high-temperature dust removal flue gas as
Add the thermal source of heat pipe, heat preheating zone and the material in low-temperature reduction district of described novel rotary hearth furnace.Thus, described novel rotary hearth furnace
Flue 30 is located at low-temperature reduction district, and the flue gas of generation adds heat pipe directly as preheating zone and low-temperature reduction district after dedusting
Thermal source, it is achieved that the fume afterheat that furnace interior produces can effectively be recycled, thus, this system achieves environmental protection,
Indirectly reduce process energy consumption and cost.
According to a particular embodiment of the invention, this system also includes described slag sluicing system device, for by described metallization
Pelletizing carries out slag sluicing system process, obtains ferro-nickel product and tailings.In some embodiments of the invention, described slag sluicing system dress
Put and include: the outlet of metallized pellet entrance, ferro-nickel product and tailings outlet, described metallized pellet entrance and described metallization ball
Group's outlet is connected, and for described metallized pellet is carried out slag sluicing system process, obtains ferro-nickel product and tailings.Thus, this is
System achieves the efficient recovery to lateritic nickel ore, has obtained ferro-nickel product.
According to embodiments of the invention, granularity and the weight of lateritic nickel ore, reduction coal and additive in described system are joined
Ratio is the most particularly limited.In some embodiments of the invention, lateritic nickel ore, reduction coal and additive in described system
Granularity is below 100 mesh；The weight proportion of lateritic nickel ore, reduction coal and additive is lateritic nickel ore: reduction coal: additive=
100:5-25:3-15.Because when the weight proportion of raw material lateritic nickel ore, reduction coal and additive is positioned at above-mentioned scope, can make
Cinder viscosity is low, thus, the beneficially gathering of ferronickel granule and growing up.
According to embodiments of the invention, the kind of the additive in described system is the most particularly limited, as long as can use
React in carrying out.In some embodiments of the invention, described additive is alkali metal oxide, alkali metal salt, alkaline earth
At least one in metal-oxide and alkali salt.
In another aspect of the present invention, the invention provides and a kind of utilize foregoing system to carry out lateritic nickel ore
The method of reduction reaction, as it is shown on figure 3, comprise the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, in order to mixed
Compound material.
According to embodiments of the invention, described system includes dispensing mixing device, is used for lateritic nickel ore, reduction coal and adds
Add agent and carry out batch mixing and dispensing process, obtain mixed material.In some embodiments of the invention, the laterite nickel in described system
The granularity of ore deposit, reduction coal and additive is below 100 mesh；The weight proportion of lateritic nickel ore, reduction coal and additive is laterite nickel
Ore deposit: reduction coal: additive=100:5-25:3-15.Because, when the weight proportion position of raw material lateritic nickel ore, reduction coal and additive
In above-mentioned scope, cinder viscosity can be made low, thus, the beneficially gathering of ferronickel granule and growing up.Enforcement according to the present invention
Example, the kind of the additive in described system is the most particularly limited, as long as can be used in carrying out reacting.The present invention's
In some embodiments, described additive is in alkali metal oxide, alkali metal salt, alkaline earth oxide and alkali salt
At least one.
(2) mixed material adds shaped device be shaped processing, in order to obtain mixing pelletizing.
(3) mixing pelletizing addition drying device is dried process, in order to obtain dry bulb group.
(4) dry bulb group is joined novel rotary hearth furnace and carry out reduction melting process, in order to obtain metallized pellet.
According to a particular embodiment of the invention, described novel rotary hearth furnace includes: the most adjacent feed zone, preheating zone, low
Temperature reducing zone, high temperature reduction district and discharge zone, wherein, be provided with multiple inside the furnace wall in described preheating zone and described low-temperature reduction district
Add heat pipe, heat for described preheating zone and described low-temperature reduction district are added heat pipe mode, furnace wall, described high temperature reduction district
Inner side is provided with multiple burner, for described high temperature reduction district is carried out burner mode heating.Described novel rotary hearth furnace uses segmentation
Mode of heating, described preheating zone and the employing of described low-temperature reduction district add heat pipe mode and heat, and described high temperature reduction district uses
Burner mode heats.Described dry bulb group in the course of reaction of described novel rotary hearth furnace is: enter stove dry bulb group in preheating zone first
Carry out pre-heating temperature elevation to 700 DEG C-900 DEG C, time of staying 5-15min, the water of crystallization in removing lateritic nickel ore；Then, at low temperature
Reducing zone is warmed up to 1000 DEG C-1150 DEG C, time of staying 10-20min, and the pelletizing after removing water of crystallization is carried out low temperature also
Former, the percent reduction of nickel to more than 90%, the percent reduction of ferrum to more than 50%；Finally, drastic reduction and nickel are carried out in high temperature reduction district
Ferrum crystal grain is grown up, high temperature reduction district temperature 1200-1400 DEG C, time of staying 10-20min, the heating side in described high temperature reduction district
Formula is burner heating, and lateritic nickel ore pelletizing finally gives metal in high temperature reduction district after drastic reduction and ferronickel crystal grain are grown up
Pellet discharges rotary hearth furnace in discharge zone.In this system, the preheating zone of novel rotary hearth furnace uses and adds heat pipes heat, relative to burner
For heating, neither affect whole reducing process, the problem that preheating zone fume amount big blocking burner can be solved again, it is achieved that laterite
The low-temperature reduction of nickel minerals is smelted.
Described fume dust remover, for high-temperature flue gas is carried out dust removal process, obtains high-temperature dust removal flue gas, described high temperature
The dedusting exhanst gas outlet heat pipe high-temperature dust removal smoke inlet that adds with described preheating zone and described low-temperature reduction district respectively is connected, and is used for
Using described high-temperature dust removal flue gas as the thermal source adding heat pipe, heat preheating zone and the thing in low-temperature reduction district of described novel rotary hearth furnace
Material.Thus, flue is located at low-temperature reduction district by described novel rotary hearth furnace, the flue gas of generation after dedusting directly as preheating zone
With the thermal source that low-temperature reduction district adds heat pipe, it is achieved that the fume afterheat that furnace interior produces can effectively be recycled, thus, should
System achieves environmental protection, indirectly reduces process energy consumption and cost.
(5) metallized pellet is added slag sluicing system device and carry out slag sluicing system process, in order to obtain ferro-nickel product and tail
Slag.According to embodiments of the invention, described slag sluicing system device, for described metallized pellet is carried out slag sluicing system process,
Obtain ferro-nickel product and tailings.Thus, this system achieves the effective process to lateritic nickel ore, has obtained ferro-nickel product.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, novel rotary hearth furnace in this system
Preheating zone use add heat pipes heat, relative to burner heat for, neither affect whole reducing process, preheating zone can be solved again
The problem of fume amount big blocking burner, it is achieved that the low-temperature reduction of lateritic nickel ore is smelted.Further, described novel rotary hearth furnace is by flue
Being located at low-temperature reduction district, the flue gas of generation adds the thermal source of heat pipe after dedusting directly as preheating zone and low-temperature reduction district, real
The fume afterheat having showed furnace interior generation can effectively be recycled, thus, this system achieves environmental protection, indirectly reduces
Process energy consumption and cost.
Embodiment 1
Lateritic nickel ore (containing Ni 1.85%), reduction coal and sodium carbonate 100:5:5 in mass ratio are carried out in blend ingredients device
Dispensing, mixing treatment obtain mixed material, and mixed material is shaped process in shaped device and obtains mixing pelletizing, then will
Mixing pelletizing is dried process in drying device and obtains dry bulb group (aqueous 1.0%), dry bulb group is entered in novel rotary hearth furnace
Row reduction melting processes, the annulus angle 30 of preheating zone, preheating zone temperature 700 DEG C, time of staying 10min；Low-temperature reduction district
Annulus angle 100, low-temperature reduction district temperature 1000 DEG C, time of staying 15min；The annulus angle 200 in high temperature reduction district, high temperature
Reducing zone temperature 1350 DEG C, time of staying 20min.Preheating zone and the origin of heat high temperature reduction district adding heat pipe in low-temperature reduction district
High-temperature dust removal flue gas, smelt terminate after the metallized pellet obtaining degree of metalization 55%, metallized pellet is sent into slag ferrum and divides
Carrying out slag sluicing system process in device and obtain ferronickel powder (containing Ni 5.62%, TFe 64.73%) and tailings, whole flow process nickel returns
Yield 95%.
Embodiment 2
Lateritic nickel ore (containing Ni 2.45%), reduction coal and limestone 100:10:15 in mass ratio less than 100 mesh is joined at batch mixing
Carry out dispensing in material device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Close pelletizing, then mixing pelletizing is dried in drying device process and obtains dry bulb group (aqueous 1.5%), dry bulb group is existed
Novel rotary hearth furnace carries out reduction melting process, the annulus angle 50 of preheating zone, preheating zone temperature 800 DEG C, the time of staying
5min；The annulus angle 150 in low-temperature reduction district, low-temperature reduction district temperature 1100 DEG C, time of staying 10min；High temperature reduction district
Annulus angle 150, high temperature reduction district temperature 1300 DEG C, time of staying 15min.Preheating zone and low-temperature reduction district add heat pipe
The high-temperature dust removal flue gas in origin of heat high temperature reduction district, smelts the metallized pellet obtaining degree of metalization 60% after terminating, metal
Pellet feeding slag sluicing system device carries out slag sluicing system process and obtains ferronickel powder (containing Ni 6.82%, TFe 65.64%) and tail
Slag, whole flow process nickel recovery 96%.
Embodiment 3
Lateritic nickel ore (containing Ni 1.12%), reduction coal and Calx 100:25:9 in mass ratio are joined in blend ingredients device
Material, mixing treatment obtain mixed material, and mixed material is shaped process in shaped device and obtains mixing pelletizing, then will be mixed
Conjunction pelletizing is dried process in drying device and obtains dry bulb group (aqueous 0.5%), dry bulb group is carried out in novel rotary hearth furnace
Reduction melting processes, the annulus angle 70 of preheating zone, preheating zone temperature 750 DEG C, time of staying 10min；The circle in low-temperature reduction district
Ring angle 120, low-temperature reduction district temperature 1150 DEG C, time of staying 20min；The annulus angle 160 in high temperature reduction district, high temperature is also
Former district temperature 1350 DEG C, time of staying 20min.The origin of heat high temperature reduction district adding heat pipe in preheating zone and low-temperature reduction district
High-temperature dust removal flue gas, smelts the metallized pellet obtaining degree of metalization 64% after terminating, and metallized pellet sends into slag sluicing system dress
Carry out slag sluicing system process in putting and obtain ferronickel powder (containing Ni 3.83%, TFe 75.83%) and tailings, whole flow process nickel recovery
97%。
Embodiment 4
By lateritic nickel ore (containing Ni 1.85%), reduction coal and the sodium carbonate 100:5:5 in mass ratio less than 100 mesh at blend ingredients
Carry out dispensing in device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Pelletizing, is then dried mixing pelletizing process in drying device and obtains dry bulb group (aqueous 1.0%), rolls into a ball dry bulb newly
Type rotary hearth furnace carries out reduction melting process, the annulus angle 40 of preheating zone, preheating zone temperature 850 DEG C, time of staying 10min；
The annulus angle 120 in low-temperature reduction district, low-temperature reduction district temperature 1050 DEG C, time of staying 15min；The annulus in high temperature reduction district
Angle 180, high temperature reduction district temperature 1250 DEG C, time of staying 20min.Preheating zone and the heat adding heat pipe in low-temperature reduction district
The high-temperature dust removal flue gas in high temperature reduction district, source, smelts the metallized pellet obtaining degree of metalization 55% after terminating, will metallization
Pelletizing send in electric furnace 1450 DEG C carry out melting separating treatment obtain dilval (containing Ni 18.62%, TFe 79.73%) and
Ferronickel slag, whole flow process nickel recovery 96%.
Embodiment 5
Lateritic nickel ore (containing Ni 2.45%), reduction coal and limestone 100:20:15 in mass ratio less than 100 mesh is joined at batch mixing
Carry out dispensing in material device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Close pelletizing, then mixing pelletizing is dried in drying device process and obtains dry bulb group (aqueous 1.5%), dry bulb group is existed
Novel rotary hearth furnace carries out reduction melting process, the annulus angle 60 of preheating zone, preheating zone temperature 900 DEG C, the time of staying
5min；The annulus angle 130 in low-temperature reduction district, low-temperature reduction district temperature 1150 DEG C, time of staying 20min；High temperature reduction district
Annulus angle 150, high temperature reduction district temperature 1400 DEG C, time of staying 10min.Preheating zone and low-temperature reduction district add heat pipe
The high-temperature dust removal flue gas in origin of heat high temperature reduction district, smelts the metallized pellet obtaining degree of metalization 60% after terminating, by gold
Genus pellet feeding electric furnace carries out melting separating treatment and obtains dilval (containing Ni 24.82%, TFe 73.24%) and ferronickel
Slag, whole flow process nickel recovery 97%.
Embodiment 6
Lateritic nickel ore (containing Ni 1.12%), reduction coal and Calx 100:25:9 in mass ratio are joined in blend ingredients device
Material, mixing treatment obtain mixed material, and mixed material is shaped process in shaped device and obtains mixing pelletizing, then will be mixed
Conjunction pelletizing is dried process in drying device and obtains dry bulb group (aqueous 0.5%), dry bulb group is carried out in novel rotary hearth furnace
Reduction melting processes, the annulus angle 80 of preheating zone, preheating zone temperature 900 DEG C, time of staying 10min；The circle in low-temperature reduction district
Ring angle 150, low-temperature reduction district temperature 1150 DEG C, time of staying 20min；The annulus angle 140 in high temperature reduction district, high temperature is also
Former district temperature 1300 DEG C, time of staying 15min.The origin of heat high temperature reduction district adding heat pipe in preheating zone and low-temperature reduction district
High-temperature dust removal flue gas, smelts the metallized pellet obtaining degree of metalization 64% after terminating, sends in electric furnace by metallized pellet
Row fusing separating treatment obtains dilval (containing Ni 15.35%, TFe 82.83%) and ferronickel slag, whole flow process nickel recovery
98%。
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include one or more this feature.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, 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, in can being two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
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 or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification, simultaneously for one of ordinary skill in the art, according to the think of of the application
Think, the most all will change.
Claims (9)
1. the reduction reaction system of a fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group, it is characterised in that bag
Include: dispensing mixing device, shaped device, drying device, novel rotary hearth furnace, slag sluicing system device and fume dust remover, wherein:
Described dispensing mixing device includes: lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material outlet, uses
In lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, obtain mixed material；
Described shaped device includes: mixed material entrance and mixing pelletizing outlet, described mixed material entrance and described mixture
Material outlet is connected, and for described mixed material is shaped process, obtains mixing pelletizing；
Described drying device includes: mixing pelletizing entrance and the outlet of dry bulb group, described mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and for described mixing pelletizing is dried process, obtains dry bulb group；
Described novel rotary hearth furnace includes: the most adjacent feed zone, preheating zone, low-temperature reduction district, high temperature reduction district and discharge zone,
Wherein, described feed zone furnace wall is provided with dry bulb group entrance, and described dry bulb group entrance exports with described dry bulb group and is connected, described pre-
Furnace wall, hot-zone is provided with and adds heat pipe high-temperature dust removal smoke inlet, and furnace wall, described low-temperature reduction district is provided with and adds heat pipe high-temperature dust removal cigarette
Gas entrance and high-temperature flue gas outlet, be provided with inside the furnace wall in described preheating zone and described low-temperature reduction district and multiple add heat pipe, be used for
Described preheating zone and described low-temperature reduction district are added heat pipe mode heat, be provided with multiple inside furnace wall, described high temperature reduction district
Burner, for described high temperature reduction district carries out burner mode heating, furnace wall, described discharge zone is provided with metallized pellet outlet；
Described rotary hearth furnace uses zone heating mode, described preheating zone and the employing of described low-temperature reduction district to add heat pipe mode and heat,
Described high temperature reduction district uses burner mode to heat；
Described slag sluicing system device includes: the outlet of metallized pellet entrance, ferro-nickel product and tailings outlet, described metallized pellet
Entrance is connected with the outlet of described metallized pellet, for described metallized pellet is carried out slag sluicing system process, obtains ferronickel and produces
Product and tailings；
Described fume dust remover includes: high-temperature flue gas entry and high-temperature dust removal exhanst gas outlet, described high-temperature flue gas entry and institute
The high-temperature flue gas outlet stating novel rotary hearth furnace is connected, and for high-temperature flue gas is carried out dust removal process, obtains high-temperature dust removal flue gas, institute
State high-temperature dust removal exhanst gas outlet respectively with described preheating zone and described low-temperature reduction district add heat pipe high-temperature dust removal smoke inlet phase
Even, for using described high-temperature dust removal flue gas as the thermal source adding heat pipe, heat the preheating zone of described novel rotary hearth furnace and low temperature also
The material in former district.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described novel rotary hearth furnace is annular, institute
State the annulus angle 30-90 of preheating zone.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described novel rotary hearth furnace is annular, institute
State the annulus angle 100-150 in low-temperature reduction district.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described novel rotary hearth furnace is annular, institute
State the annulus angle 100-200 in high temperature reduction district.
5. utilize the system described in any one of claim 1-4 to carry out the method for reduction reaction for lateritic nickel ore, its feature
It is, comprises the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, in order to mixed
Compound material；
(2) mixed material adds shaped device be shaped processing, in order to obtain mixing pelletizing；
(3) mixing pelletizing addition drying device is dried process, in order to obtain dry bulb group；
(4) dry bulb group is joined novel rotary hearth furnace and carry out reduction melting process, in order to obtain metallized pellet；
(5) metallized pellet is added slag sluicing system device and carry out slag sluicing system process, in order to obtain ferro-nickel product and tailings.
Method the most according to claim 5, it is characterised in that lateritic nickel ore, reduction coal and the interpolation in described step (1)
The granularity of agent is below 100 mesh.
Method the most according to claim 5, it is characterised in that the additive in described step (1) is selected from alkali metal oxygen
At least one in compound, alkali metal salt, alkaline earth oxide and alkali salt.
Method the most according to claim 5, it is characterised in that lateritic nickel ore, reduction coal and the interpolation in described step (1)
The weight proportion of agent is lateritic nickel ore: reduction coal: additive=100:5-25:3-15.
Method the most according to claim 5, it is characterised in that anti-at novel rotary hearth furnace of dry bulb group in described step (4)
The condition is answered to be: preheating zone temperature 700-900 DEG C, time of staying 5-15min；Low-temperature reduction district temperature 1000 DEG C-1150 DEG C, stops
Time 10-20min；High temperature reduction district temperature 1200-1400 DEG C, time of staying 10-20min.
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