CN108220588B - A kind of method of lateritic nickel ore pressurization densification sintering - Google Patents
A kind of method of lateritic nickel ore pressurization densification sintering Download PDFInfo
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- CN108220588B CN108220588B CN201810025683.4A CN201810025683A CN108220588B CN 108220588 B CN108220588 B CN 108220588B CN 201810025683 A CN201810025683 A CN 201810025683A CN 108220588 B CN108220588 B CN 108220588B
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- sintering
- nickel ore
- lateritic nickel
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- 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
- C22B23/005—Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process
-
- 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 invention discloses a kind of methods of lateritic nickel ore pressurization densification sintering, comprising the following steps: lateritic nickel ore, powder of returning mine, fuel and quick lime are mixed to get mixture；Adjusting mixture moisture is 16wt%~18wt%, and mixing granulation obtains sintering feed；Sintering feed is packed into sintering machine, is lighted a fire；Apply the outer plus field of force in sintering charge level, sintering obtains heat sinter；The additional field of force is removed, after heat sinter cooling, crushing and screening obtains finished product sinter.Method of the invention applies certain pressure by being sintered charge level to lateritic nickel ore, makes loose sinter of the surface layer into the middle part bed of material from densifying under applied force field action, improves lateritic nickel ore sinter strength and yield.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, the densification sintering it particularly relates to which a kind of lateritic nickel ore pressurizes
Method.
Background technique
Nickel resources are divided into two class of nickel sulfide ore and nickel ore, nickel ore, that is, lateritic nickel ore in world wide.Generation at present
The nickel product on boundary upper 40% or so originates from lateritic nickel ore, remaining both is from nickel sulfide ore, but the sulphur with high-grade, easily exploited
Change the excessive exploitation of nickel minerals and the influence of smelting laterite-nickel ores technique increasingly factors such as maturation, is produced with lateritic nickel ore production nickel
Product just gradually become world.
Lateritic nickel ore is mainly distributed on the tropic countries within 30 ° of equatorial line north and south in world wide, has verified land
About 80,000,000 t of nickel ore resource reserves, mainly have Cuba (23,000,000 t), Indonesia (13,000,000 t), Philippine (1100
Ten thousand t), Australian (11,000,000 t), New Caledonia (14,000,000 t) etc., wherein nickel sulfide ore only accounts for 20%, and lateritic nickel ore is about
75% is accounted for, and silicic acid nickel minerals accounts for 5%.The lateritic nickel ore in China is mainly distributed on the meeting reason in Sichuan Province, the Yuanjiang River in Yunnan Province and Mojiang
And the areas such as first tor in Qinghai Province.Lateritic nickel ore reserves account for about the 9.6% of national nickel resources reserves, and nickel sulfide ore
Account for the 86% of national nickel resources reserves.Since domestic lateritic nickel ore reserves are relatively fewer, China is every year from Philippine and India
The a large amount of lateritic nickel ore of Nicaea import, significant fraction rely on import.
Currently, China takes pyrometallurgical smelting ferronickel more universal, it is roughly divided into sintering-blast furnace process, nickel and low nickel in production
Product；Rotary kiln electric furnace process (RKEF method), produces high ferronickel.Since most of high-grade lateritic nickel ore resource is by institute, Western power
Control, and price is expensive, and most of ferronickel manufacturers, China can only use middle-low grade lateritic nickel ore resource.But due to low
Grade lateritic nickel ore mechanical water and crystal water content are high, and scaling loss is big, and sintering process liquid phase production quantity is few, causes sinter loose more
Hole, intensity is low, unfavorable to subsequent blast fumance.
At this stage, related lateritic nickel ore impressed pressure field intensified-sintered patent and report are found no.
Summary of the invention
For above-mentioned technical problem in the related technology, the present invention proposes a kind of side of lateritic nickel ore pressurization densification sintering
Method applies certain pressure by being sintered charge level to lateritic nickel ore, and surface layer dredging into the middle part bed of material is made under applied force field action
Loose sinter improves lateritic nickel ore sinter strength and yield from densifying.
To realize the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
A kind of method of lateritic nickel ore pressurization densification sintering, comprising the following steps:
S1, lateritic nickel ore, powder of returning mine, fuel and quick lime are mixed to get mixture；
S2, the mixture moisture is adjusted as 16wt%~18wt%, mixing granulation obtains sintering feed；
S3, the sintering feed is packed into sintering machine, igniting；
S4, apply the outer plus field of force in sintering charge level, sintering obtains heat sinter；
S5, the additional field of force is removed, after heat sinter cooling, crushing and screening obtains finished product sinter.
Above-mentioned method, it is preferred that the fuel is anthracite.The dual alkalinity of the mixture is 1.0~1.4.
Above-mentioned method, it is preferred that in the S1 step, the mass percentage of the lateritic nickel ore be 51.5wt%~
57wt%, the powder of returning mine mass percentage be 30wt%, the quality of fuel percentage composition is 7wt%~8.5wt%, institute
The mass percentage for stating quick lime is 6wt%~10wt%.
Above-mentioned method, it is preferred that in the S2 step, in the processes of mixing and granulating, 18 r of mixing machine revolving speed
min-1~30rmin-1, pack completeness 12%~19%, Granulation time 3min~8min, partial size is greater than 0.5mm in the sintering feed
It is 95% or more, particle of the partial size greater than 1mm is 80% or more.
It is further preferred that 25 rmin of mixing machine revolving speed-1, pack completeness 15%, Granulation time 5min.
Above-mentioned method, it is preferred that in the S3 step, firing temperature is 1100 ± 50 DEG C, igniting negative pressure 4kPa~
6kPa, the duration of ignition are 1.5min~2.5min.
Above-mentioned method, it is preferred that in the S4 step, the mode for applying the additional field of force are as follows: away from sintering ignition
Sintering charge level at cover 15m starts continuously to place pressure roller, gives the sintering charge level uniformly additional field of force, pressure is removed before sintering end point
Roller.
Above-mentioned method, it is preferred that in the S4 step, the additional field of force is 2500 N/m2~10000N/m2。
Above-mentioned method, it is preferred that in the S4 step, the cooling time is 5min~10min, and cooling negative pressure is
5kPa~7kPa.
Above-mentioned method, it is preferred that sinter temperature is less than 120 DEG C after cooling.
Compared with the prior art, the advantages of the present invention are as follows:
(1) it the present invention provides a kind of method of lateritic nickel ore pressurization densification sintering, is burnt for low-grade laterite nickel ore
The problem of tying loose porous mine, intensity difference, develops pressure sintering densification technology, is effectively improved solid phase and liquid in sinter bed
Phase reaction reduces pore opening and quantity, improves lateritic nickel ore sinter microstructure, makes sinter in applied force off field from cause
Densification, to improve Sintering Yield and intensity.
(2) it the present invention provides a kind of method of lateritic nickel ore pressurization densification sintering, is easily achieved in sintering production,
It is simple to operate, hence it is evident that improve Sintering Yield, there is very big promotional value.
(3) the present invention provides a kind of method of lateritic nickel ore pressurization densification sintering, preferred additional force intensity models
It encloses, within the scope of the outer plus field of force, increases with the additional field of force, the output increased of lateritic nickel ore sintering, drum strength increases, and consolidates
Body burnup is substantially reduced.When the additional field of force is lower than 2500N/m2When, impressed pressure is insufficient to allow sintering feed cake closely knit, is not achieved certainly
Densification；When the additional field of force is higher than 10000N/m2When, impressed pressure is excessive, by adhesion strength weaker area pressure in sintering feed cake
It is broken, hence it is evident that reduce sinter yield rate, sintering output is caused to reduce.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the process flow chart of the embodiment of the present invention 1.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Material employed in following embodiment and instrument are commercially available.Wherein, the Iron grade 44%~50% of lateritic nickel ore,
Nickel content 0.8%~1.4%.
Embodiment 1
A kind of method of lateritic nickel ore pressurization densification sintering, referring to Fig. 1, comprising the following steps:
(1) ingredient: by the lateritic nickel ore of the nickeliferous grade 1.4% of 53wt%, the powder of returning mine of 30wt%, 7.5wt% anthracite,
The quick lime of 9.5wt% mixes, and obtains mixture.
(2) it mixes, pelletize: water being added in mixture, the moisture position for adjusting mixture is 17.0%.In trommel mixer
Middle mixing controls 25 rmin of mixing machine revolving speed-1, pack completeness 15%, Granulation time 5min, obtain moisture be 17.0% sintering
Material.In sintering feed, it is 96 wt% that granularity, which is greater than 0.5mm, and sintering feed of the granularity greater than 1mm is 86 wt%.
(3) it lights a fire: the sintering feed of step (2) is fitted into sintering machine, the packed height of sinter bed is 680mm.Control
Igniting negative pressure is 5kPa, and firing temperature is 1100 DEG C, and duration of ignition 1.5min lights a fire to sintering feed.
(4) it is sintered: placing continuous pressure roller away from the sintering feed surface at sintering ignition cover position 15m, giving sintering feed
Uniform 2500 N/m of the external pressurized field of force in surface2, it is sintered, 1400 DEG C of bed of material maximum sintering temperature, is sintered in the case where being sintered negative pressure 12kPa
Time 23min, obtains heat sinter.
(5) cooling: heat sinter is cooling by air blast, and cooling negative pressure is 5kPa, and cooling time, 5min, obtained cold burning
Tie mine.
(6) it is crushed, sieves: cold sinter is crushed, sieve, obtain the finished product sinter of+5mm and the powder of returning mine of -5mm.
Sintered ore rotary drum strength 48.67%, yield rate 61.68%, usage factor 0.87tm-2·h-1, solid burnup
145.36Kg/t。
Embodiment 2
A kind of method of lateritic nickel ore pressurization densification sintering, comprising the following steps:
(1) ingredient: by the lateritic nickel ore of the nickeliferous grade 1.4% of 53wt%, the powder of returning mine of 30wt%, 7.5wt% anthracite,
The quick lime of 9.5wt% mixes, and obtains mixture.
(2) it mixes, pelletize: water being added in mixture, the moisture position for adjusting mixture is 17.0%.In trommel mixer
Middle mixing controls 25 rmin of mixing machine revolving speed-1, pack completeness 15%, Granulation time 5min, obtain moisture be 17.0% sintering
Material.In sintering feed, it is 96 wt% that granularity, which is greater than 0.5mm, and sintering feed of the granularity greater than 1mm is 86 wt%.
(3) it lights a fire: the sintering feed of step (2) is fitted into sintering machine, the packed height of sinter bed is 680mm.Control
Igniting negative pressure is 5kPa, and firing temperature is 1100 DEG C, and duration of ignition 1.5min lights a fire to sintering feed.
(4) it is sintered: placing continuous pressure roller away from the sintering feed surface at sintering ignition cover position 15m, giving sintering feed
Uniform 5000 N/m of the external pressurized field of force in surface2, it is sintered, 1410 DEG C of bed of material maximum sintering temperature, is sintered in the case where being sintered negative pressure 12kPa
Time 22.5min, obtains heat sinter.
(5) cooling: heat sinter is cooling by air blast, and cooling negative pressure is 5kPa, and cooling time, 5min, obtained cold burning
Tie mine.
(6) it is crushed, sieves: cold sinter is crushed, sieve, obtain the finished product sinter of+5mm and the powder of returning mine of -5mm.
Sintered ore rotary drum strength 48.27%, yield rate 65.09%, usage factor 0.94tm-2·h-1, solid burnup
137.55Kg/t。
Embodiment 3
A kind of method of lateritic nickel ore pressurization densification sintering, comprising the following steps:
(1) ingredient: by the lateritic nickel ore of the nickeliferous grade 1.4% of 57wt%, the powder of returning mine of 30wt%, 6.5wt% anthracite,
The quick lime of 6.5wt% mixes, and obtains mixture.
(2) it mixes, pelletize: water being added in mixture, the moisture position for adjusting mixture is 17.0%.In trommel mixer
Middle mixing controls 25 rmin of mixing machine revolving speed-1, pack completeness 15%, Granulation time 5min, obtain moisture be 17.0% sintering
Material.In sintering feed, it is 96 wt% that granularity, which is greater than 0.5mm, and sintering feed of the granularity greater than 1mm is 86 wt%.
(3) it lights a fire: the sintering feed of step (2) is fitted into sintering machine, the packed height of sinter bed is 680mm.Control
Igniting negative pressure is 5kPa, and firing temperature is 1100 DEG C, and duration of ignition 1.5min lights a fire to sintering feed.
(4) it is sintered: placing continuous pressure roller away from the sintering feed surface at sintering ignition cover position 15m, giving sintering feed
Uniform 7500 N/m of the external pressurized field of force in surface2, it is sintered, 1430 DEG C of bed of material maximum sintering temperature, is sintered in the case where being sintered negative pressure 12kPa
Time 22min, obtains heat sinter.
(5) cooling: heat sinter is cooling by air blast, and cooling negative pressure is 5kPa, and cooling time, 5min, obtained cold burning
Tie mine.
(6) it is crushed, sieves: cold sinter is crushed, sieve, obtain the finished product sinter of+5mm and the powder of returning mine of -5mm.
Sintered ore rotary drum strength 47.87%, yield rate 66.77%, usage factor 1.01tm-2·h-1, solid burnup
130.44Kg/t。
Embodiment 4
A kind of method of lateritic nickel ore pressurization densification sintering, comprising the following steps:
(1) ingredient: by the lateritic nickel ore of the nickeliferous grade 1.4% of 57wt%, the powder of returning mine of 30wt%, 6.5wt% anthracite,
The quick lime of 6.5wt% mixes, and obtains mixture.
(2) it mixes, pelletize: water being added in mixture, the moisture position for adjusting mixture is 17.0%.In trommel mixer
Middle mixing controls mixing machine revolving speed 25rmin-1, pack completeness 15%, Granulation time 5min, obtain moisture be 17.0% sintering
Material.In sintering feed, it is 96 wt% that granularity, which is greater than 0.5mm, and sintering feed of the granularity greater than 1mm is 86 wt%.
(3) it lights a fire: the sintering feed of step (2) is fitted into sintering machine, the packed height of sinter bed is 680mm.Control
Igniting negative pressure is 5kPa, and firing temperature is 1100 DEG C, and duration of ignition 1.5min lights a fire to sintering feed.
(4) it is sintered: placing continuous pressure roller away from the sintering feed surface at sintering ignition cover position 15m, giving sintering feed
Uniform 10000 N/m of the external pressurized field of force in surface2, it is sintered, 1450 DEG C of bed of material maximum sintering temperature, burns in the case where being sintered negative pressure 11kPa
Time 22min is tied, heat sinter is obtained.
(5) cooling: heat sinter is cooling by air blast, and cooling negative pressure is 5kPa, and cooling time, 5min, obtained cold burning
Tie mine.
(6) it is crushed, sieves: cold sinter is crushed, sieve, obtain the finished product sinter of+5mm and the powder of returning mine of -5mm.
Sintered ore rotary drum strength 47.09%, yield rate 66.29%, usage factor 1.09tm-2·h-1, solid burnup
124.18Kg/t。
Comparative example 1
There is no the external pressurized field of force, remaining condition is same as Example 1.
Sintered ore rotary drum strength 45.87%, yield rate 64.88%, usage factor 0.97tm-2·h-1, solid burnup
140.52Kg/t。
The data obtained from above-described embodiment: the variation of impressed pressure, sintered ore rotary drum strength 47.09-
48.67%, yield rate 61.68~66.77%, 0.87~1.09tm of usage factor-2·h-1, solid burnup 124.18~
145.36Kg/t.Compared with 1 data of comparative example, using method of the invention, in optimal conditions (embodiment 4), sinter turns
Drum intensity improves 1.22 percentage points, and yield rate improves 1.41 percentage points, and usage factor improves 0.12tm-2·h-1, solid
Burnup reduces 10.08Kg/t.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of method of lateritic nickel ore pressurization densification sintering, which comprises the following steps:
S1, lateritic nickel ore, powder of returning mine, fuel and quick lime are mixed to get mixture；
S2, the mixture moisture is adjusted as 16wt%~18wt%, mixing granulation obtains sintering feed；
S3, the sintering feed is packed into sintering machine, igniting；
S4, apply the outer plus field of force in sintering charge level, sintering obtains heat sinter；The mode for applying the additional field of force are as follows: away from
Sintering charge level at sintering ignition cover 15m starts continuously to place pressure roller, the sintering charge level uniformly additional field of force is given, in sintering end point
Before remove pressure roller；The additional field of force is 2500N/m2~10000N/m2；
S5, the additional field of force is removed, after heat sinter cooling, crushing and screening obtains finished product sinter.
2. the method according to claim 1, wherein the fuel is anthracite；The diacidic base of the mixture
Degree is 1.0~1.4.
3. the method according to claim 1, wherein in the S1 step, the quality percentage of the lateritic nickel ore
Content is 51.5wt%~57wt%, the mass percentage of the powder of returning mine is 30wt%, the quality of fuel percentage contains
Amount is 7wt%~8.5wt%, and the mass percentage of the quick lime is 6wt%~10wt%.
4. the method according to claim 1, wherein in the processes of mixing and granulating, being mixed in the S2 step
Machine revolving speed 18r 〃 min-1~30r 〃 min-1, pack completeness 12%~19%, Granulation time 3min~8min, grain in the sintering feed
It is 95% or more that diameter, which is greater than 0.5mm, and particle of the partial size greater than 1mm is 80% or more.
5. method according to claim 1 to 4, which is characterized in that in the S3 step, firing temperature is
1100 ± 50 DEG C, light a fire negative pressure 4kPa~6kPa, and the duration of ignition is 1.5min~2.5min.
6. method according to claim 1 to 4, which is characterized in that in S5 step, the cooling time is
5min~10min, cooling negative pressure are 5kPa~7kPa.
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