CN106636625B - Using the method for rotary kiln for directly reducing RKEF combination methods production ferronickel - Google Patents
Using the method for rotary kiln for directly reducing RKEF combination methods production ferronickel Download PDFInfo
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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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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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
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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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
- C21B13/14—Multi-stage processes processes carried out in different vessels or 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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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
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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
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
- C22B4/06—Alloys
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Abstract
The present invention provides a kind of method that ferronickel is produced using rotary kiln for directly reducing RKEF combination methods, comprises the following steps：Lateritic nickel ore drying for standby；Appropriate dried lateritic nickel ore is taken to be uniformly mixed so as to obtain batch mixing A with carbonaceous reducing agent, dolomite after broken, screening, the mass percent that carbonaceous reducing agent accounts for batch mixing A is 17 25%；Batch mixing A is made pelletizing and is sent into the first rotary kiln baking, and calcining obtains the thick ferronickel particle that dregginess is 50 60% after Screening Treatment；The thick ferronickel particle mixes with dry lateritic nickel ore, lime stone again, the second rotary kiln baking is sent into together, calcining is direct plungeed into mineral hot furnace and melted, the secondary voltage of mineral hot furnace is 275 315V, primary current is 380 420A, the temperature of molten iron is 1,500 1540 DEG C in mineral hot furnace, obtains the molten iron containing ferronickel.The ferro-nickel recovery rate and purity of the present invention is higher, and energy consumption is kept low.
Description
Technical field
It is especially a kind of to be given birth to using rotary kiln for directly reducing-RKEF combination methods the invention belongs to metallurgical technology technical field
The method for producing ferronickel.
Background technology
Divided by geologic origin, nickel ore resource is broadly divided into two major classes：Nickel sulfide ore and lateritic nickel ore.Domestic nickel ore resource
Mainly nickel sulfide ore, lateritic nickel ore are few.The demand of metallic nickel is increased with the soaring and economic development of nickel valency, original sulphur
Change nickel ore resource far from the market demand is met, China starts largely to enter from countries in Southeast Asia such as Indonesia, Philippine
Mouth lateritic nickel ore, by 2010 accumulative 25,000,000 tons of the import nickel minerals (lateritic nickel ore) in end of the year China, in recent years still with annual
More than 20% speed increases.
At present, the processing method of domestic and international lateritic nickel ore mainly has two kinds of smelting processes of pyrogenic process and wet method；Wherein pyrogenic process smelting
Refining is short because having flow, and three wastes discharge amount is few, the features such as technical maturity, it has also become the main technique of smelting laterite-nickel ores.Wherein,
In pyrometallurgical smelting using it is wide be rotary kiln for directly reducing method and RKEF methods (i.e. rotary kiln drying prereduction-electro-smelting
Technique).
The technological process of traditional rotary kiln for directly reducing method smelting ferronickel is raw ore after drying, broken, screening process
Briquetting is mixed in proportion with flux, reducing agent, nodulizing is dried through rotary kiln and is calcined with high temperature reduction, generates dilval,
The mixture of dilval and slag caused by rotary kiln is handled by water quenching, crushing and screening, magnetic separation etc. again, obtains the granular nickel of sponge
Iron product.The great advantage of the technique is that flow is short, and energy consumption is low, and production cost is low, and reason is that the process energy consumption only reduces roasting
A process is burnt, and rotary kiln baking process can do fuel using cheap coal, greatly reduce energy resource consumption.The technique lacks
Point is：The ferronickel granule purity produced is low, be directly used in stainless steel smelting the resistance to material of stainless steel smelting equipment is caused it is very big
Damage, greatly reduce service life of refractory material, meanwhile, it is big to be directly used as the stainless steel smelting quantity of slag, the relatively low (gold of metal recovery rate
Belong to the rate of recovery generally below 70%).
The flow of traditional RKEF methods ferronickel smelting proces is：Stock yard → screening, broken and mixing dosage → rotary kiln →
Mineral hot furnace → desulfurization → obtains the molten iron containing ferronickel.The technique has that Technological adaptability is strong, short flow, nickel recovery are high
The advantages that (up to 90~95%).The shortcomings that technique, is as follows：(1) energy consumption is big, and the average melting power consumption of calcining is in electric furnace
502kWh/t, only power consumption one just account for the 50% of cost, disappear plus the fuel of the pretreating process such as the drying before melting, roasting
Consuming maximum energy consumption cost may be up to more than 65%；(2) the lateritic nickel ore nickel grade of processing there are certain requirements, contains in lateritic nickel ore
Nickel often reduces by 1%, and production cost about improves 3~4%；(3) the caused quantity of slag is big after rotary kiln baking, and the processing of slag is also one
Hang-up.
Application publication number is that CN105463185A Chinese patent discloses a kind of pair that ferronickel is produced using magnetic separation-RKEF
Linked method, this method pass through mixture (wherein, the reducing agent that is formed after mixing lateritic nickel ore, reducing agent and solvent in proportion
Account for the 7-13% of amount of the mixture) carry out rotary kiln magnetizing roast after carry out magnetic concentration, then by the product after enrichment with other
Material (including reducing agent, solvent and lateritic nickel ore etc.) be sent into RKEF rotary kilns after dispensing carrying out according to certain proportioning
Preheating, then hot charging add in electric furnace and restore carry out slag sluicing system, obtain the molten iron containing ferronickel.The technical scheme of the patent
Realize and effectively combined rotary kiln for directly reducing method with RKEF methods, by exchanging brickkiln magnetizing roast and magnetic concentration so that
Nickel in product is enriched with, and reduces energy consumption, meanwhile, ferronickel metal recovery rate is up to 90%, ferronickel metal purity highest
For 60%.But ferronickel metal recovery rate and ferronickel metal purity are still relatively low in the prior art.
The content of the invention
The present invention is intended to provide a kind of ferro-nickel recovery rate and purity are higher, and the use that energy consumption is kept low is returned
The method that rotary kiln direct-reduction-RKEF combination methods produce ferronickel.
Using the method for rotary kiln for directly reducing-RKEF combination methods production ferronickel, comprise the following steps：
(1) lateritic nickel ore is dried, obtains dried lateritic nickel ore, it is standby；
(2) appropriate dried lateritic nickel ore is taken to carry out scalping, broken, dusting cover, screening obtains particle diameter≤8mm laterite nickel
Ore deposit；
(3) lateritic nickel ore for the particle diameter≤8mm for obtaining step (2) mixes with carbonaceous reducing agent, dolomite, obtains batch mixing
A, the mass percent that carbonaceous reducing agent accounts for batch mixing A are 17-25%, and the mass percent that dolomite accounts for batch mixing A is 0-3%；
(4) after batch mixing A being made into pelletizing, it is sent into the first rotary kiln baking and obtains calcining, material is in the first rotary kiln
Total residence time is 150-260min, and the temperature of furnace zone is 700-1300 DEG C in the first rotary kiln；
Calcining caused by (5) first rotary kilns obtains the thick ferronickel that dregginess is 50-60% through water quenching, broken, magnetic separation
Grain；
(6) dregginess obtained to step (5) is to add in appropriate step (1) to be made in 50-60% thick ferronickel particle
Dried lateritic nickel ore mixed, obtain mixed material B, dregginess is that 50-60% thick ferronickel particle accounts for the percentage of mixed material B
Than for 45-75%；
(7) lime stone is added into mixed material B, and is sent into the second rotary kiln baking together, material is in the second rotary kiln
Total residence time is 90-120min, and the temperature of furnace zone is 750-800 DEG C in the second rotary kiln, the discharging of the second rotary kiln
Temperature of charge is 750-800 DEG C at mouthful；
(8) calcining come out from the second rotary kiln is direct plungeed into mineral hot furnace and melted, the secondary voltage of mineral hot furnace is
275-315V, primary current 380-420A, the temperature of molten iron is 1500-1540 DEG C in mineral hot furnace, obtains the iron containing ferronickel
Water.
The present invention advantageous effects be：
(1) percentage that the addition of carbonaceous reducing agent accounts for compound in existing rotary kiln for directly reducing method is usually 7-
13%, and in theory, the chemical reaction of ferronickel production is as follows：
2C+O2=2CO
NiO+C=Ni+CO
NiO+CO=Ni+CO2
Fe2O3+ 3CO=2Fe+3CO2,
In the activity command of metal, the reproducibility of iron is more than the reproducibility of nickel so that the nickel ion in ore is better than iron
Ion is reduced, so, nickel is reduced out before iron；When iron percent reduction >=60%, theory thinks that nickel is 100% complete
Portion is reduced；As long as also, rotary kiln temperature be more than 570 DEG C when, iron can is reduced.According to reduction Chemical Calculation, go back
Primary 1 ton of nickel of output needs 0.205 ton of carbon, and restoring 1 ton of iron needs 0.214 ton of carbon.All gone back according to nickel and iron all 100%
Original, in 100 tons aqueous 30% of ore deposit, nickeliferous 1.7 tons, 17 tons of iron content is, it is necessary to 3.98 tons of carbon.That is, in theory,
The addition of carbonaceous reducing agent account for compound percentage be more than 3.98% (such as：Carbonaceous reducing agent of the prior art adds
It is 7-13% to enter amount to account for the percentage of compound), just it has been enough to enable nickel and iron Restore All.But the present inventor exists
Found during experiment：In the case where other conditions are constant, the addition of carbonaceous reducing agent in the prior art accounts for mixing
On the basis of the percentage of material is 7-13%, the addition of reducing agent is properly increased, rotary kiln for directly reducing method obtains calcining
The rate of recovery of middle nickel and iron may continue to improve, and reason is probably：During carbonaceous reducing agent is calcined in the first rotary kiln
A certain degree of scaling loss be present so that, enough carbonaceous reducing agents are actually unable in the need for meeting complete reduced nickel, iron in theory
Ask.Therefore, the applicant is broken through conventional, and the addition of carbonaceous reducing agent in the step (3) of the present invention is improved to carbonaceous and reduced
The percentage that agent accounts for batch mixing A is 17-25% so that nickel, iron of the batch mixing A after the first rotary kiln in batch mixing A are reduced completely,
So that ferronickel is farthest enriched with, made contributions to improve ferronickel purity and ferro-nickel recovery rate, meanwhile, also avoid excessive
Carbonaceous reducing agent bring the waste of cost；
(2) due to batch mixing A, ferronickel reduction therein is more thorough after the first rotary kiln so that is roasted caused by the first rotary kiln
The relative raising for improving, bringing the ratio of iron in mineral hot furnace material of the ratio of iron, the electric conductivity of iron are better than the stainless steels such as nickel in sand
Other metallic elements in sludge so that the electric conductivity of mineral hot furnace material is largely improved, and is unfavorable for RKEF works
The Electrode Operation of mineral hot furnace in skill, if now mineral hot furnace still using it is conventional " secondary voltage is selected between 420-510V, one
Primary current is selected between 280-320A " height force down the mode of operation of stream if, mineral hot furnace can not continue to heat, and cause ore deposit hot
Molten iron temperature is unable to reach more than 1450 DEG C in stove, has a strong impact on the rate of recovery of ferronickel metal, in consideration of it, the present inventor breaks through often
Rule, mineral hot furnace is set as " the high stream mode of operation of secondary voltage 275-315V, primary current 380-420A " low pressure,
The molten iron temperature for realizing mineral hot furnace reaches 1500-1540 DEG C of technique effect so that the material in mineral hot furnace is able to completely also
Original melting, to improve ferro-nickel recovery rate；
(3) present invention by the control of dregginess that calcining is obtained to the first rotary kiln and above-mentioned compound B respectively
The control of individual component ratio, finally final ferronickel metal recovery rate is caused to reach more than 93.5%, significantly larger than prior art
Peak 90%, also, ferronickel purity reaches more than 92.7%, significantly larger than the 60% of prior art；
(4) further, since the addition of carbonaceous reducing agent improves in the first rotary kiln, to shorten the residence time of rotary kiln
Condition is provided with the temperature for reducing rotary kiln, can not only improve production efficiency, while also avoids the generation of side reaction, also,
Carbon residue in calcining caused by first rotary kiln is sufficient for the need of follow-up second rotary kiln and mineral hot furnace for carbonaceous reducing agent
Ask so that step (6) need not be incorporated carbonaceous reducing agent, avoid waste and the cost consumption of carbonaceous reducing agent；
(5) technical scheme can control nickel point power consumption degree in≤235 degree/nickel, well below common RKEF's
Nickel point power consumption degree 380-400 degree/nickel.
Lateritic nickel ore in step (1) is dried through dry kiln, and the kiln temperature of dry kiln is preferably 1000-1050
DEG C, drying time can be foreshortened to 20-30 minutes, improve production efficiency.
Lateritic nickel ore drying to moisture content is 17-20% in step (1), has both been beneficial to crush, has avoided airborne dust again.
Carbonaceous reducing agent described in step (3) is preferably the combination at breeze or semi-coke end or both.Breeze or semi-coke end
Phosphorous low, the increase of amount of allocating will not have a huge impact to later product quality.Certainly, carbonaceous reducing agent can be with bituminous coal
Or anthracite etc..
The particle diameter of dolomite described in step (3) is≤3mm, and the granularity of dolomite is small, and its specific surface area is bigger, contact
It is more abundant.
The particle diameter of lime stone is 5-20mm described in step (7), prevents from blocking the feed pipe of mineral hot furnace.
The molten iron containing dilval that step (8) obtains directly send cast iron machine cast pig or directly as stainless steel base-material
Produce stainless steel.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Embodiment
Now illustrate embodiments of the present invention：
(1) lateritic nickel ore is dried, obtains dried lateritic nickel ore, it is standby；
(2) appropriate dried lateritic nickel ore is taken to carry out scalping, broken, dusting cover, screening obtains particle diameter≤8mm laterite nickel
Ore deposit；
(3) lateritic nickel ore for the particle diameter≤8mm for obtaining step (2) mixes with carbonaceous reducing agent, dolomite, obtains batch mixing
A, carbonaceous reducing agent use the mixture of breeze and blue carbon powder, and the mass percent that carbonaceous reducing agent accounts for batch mixing A is 17-25%,
The mass percent that dolomite accounts for batch mixing A is 0-3%；
(4) after batch mixing A being made into pelletizing, it is sent into the first rotary kiln baking and obtains calcining, material is in the first rotary kiln
Total residence time is 150-260min, and the temperature of furnace zone is 700-1300 DEG C in the first rotary kiln；
Calcining caused by (5) first rotary kilns obtains the thick ferronickel that dregginess is 50-60% through water quenching, broken, magnetic separation
Grain；
(6) dregginess obtained to step (5) is to add in appropriate step (1) to dry in 50-60% thick ferronickel particle
Lateritic nickel ore mixing afterwards, obtains mixed material B, the percentage that the thick ferronickel particle that dregginess is 50-60% accounts for mixed material B is 45-
75%；
(7) lime stone is added into mixed material B, and is sent into the second rotary kiln baking together, material is in the second rotary kiln
Total residence time is 90-120min, and the temperature of furnace zone is 750-800 DEG C in the second rotary kiln, the discharging of the second rotary kiln
Temperature of charge is 750-800 DEG C at mouthful；
(8) calcining come out from the second rotary kiln is direct plungeed into mineral hot furnace and melted, the secondary voltage of mineral hot furnace is
275-315V, primary current 380-420A, the temperature of molten iron is 1500-1540 DEG C in mineral hot furnace, obtains the iron containing ferronickel
Water.
The main component of lateritic nickel ore of the present invention is：Ni 1.72%, TFe 16.24%, H2O 28.8%.
The processing time of the mineral hot furnace determines according to body of heater size, generally, 14 meters of high 25500kVA circular ore deposit
The processing time of hot stove is 8-16h.
The dosage of the lime stone of the present invention is controlled by the basicity of mineral hot furnace clinker.Usually require that mineral hot furnace clinker
Basicity is that (wherein, the calculation formula of mineral hot furnace basicity of slag is 0.6-0.7：(MgO+CaO)/SiO2).
In order to embody the technique effect of the present invention, current inventor provides 3 kinds of embodiments (embodiment 1~3) and 5 kinds to contrast
Example (comparative example 1~5), the design parameter condition of embodiment 1~3 and comparative example 1~3 are shown in Table 1.
Table 1
The purity (%) of ferronickel and ferronickel metal return in molten iron containing ferronickel obtained by embodiment 1~3 and comparative example 1~3
Yield is shown in Table 2.
Table 2
It can be seen that from Tables 1 and 2, the embodiment 1~3 carried out according to the technical scheme of the application, what is obtained contains ferronickel
Molten iron in ferronickel purity be more than 92.7%, ferronickel metal recovery rate be more than 93.5%, meanwhile, nickel point power consumption (nickel point
Power consumption refers to the electricity needed for every ferronickel of the production containing a nickel point) control below 235 degree/nickel (well below common
RKEF 352 degree/nickel of nickel point power consumption degree).The contrast of embodiment 1~3 and comparative example 1 can be seen that from Tables 1 and 2, it can be seen that
When the percentage that the carbonaceous reducing agent of carbonaceous reducing agent accounts for batch mixing A is 13% (the carbonaceous reduction of carbonaceous reducing agent in the prior art
The percentage that agent accounts for batch mixing A is 7-13%), meanwhile, mineral hot furnace using it is existing " secondary voltage select between 420-510V,
Primary current select between 280-320A " height force down the mode of operation of stream in the case of, although the smelting temperature of mineral hot furnace
1500-1550 DEG C is can reach, still, the purity of ferronickel and ferronickel metal recovery rate are obvious in the molten iron containing ferronickel obtained
Less than embodiment 1~3, simultaneously as the content of nickel is relatively low in the thick ferronickel particle that dregginess is 50-60% so that nickel
Power consumption is put apparently higher than embodiment 1~3.It is right from Tables 1 and 2 but the addition of carbonaceous reducing agent is nor The more the better
Ratio 2 can be seen that, when the percentage that the carbonaceous reducing agent of carbonaceous reducing agent accounts for batch mixing A is more than 25%, due to the hair of side reaction
Raw, the purity of ferronickel and metal recovery rate have dropped on the contrary in the ferronickel metal recovery rate obtained and the molten iron containing ferronickel
It is low.Comparative example 3 can be seen that from Tables 1 and 2, in technical scheme according to it is existing " secondary voltage selection exist
Between 420-510V, primary current select between 280-320A " height force down the mode of operation of stream if, corresponding mineral hot furnace
Smelting temperature be only 1400-1450 DEG C, the material in mineral hot furnace can not melt completely so that ferronickel in the molten iron containing ferronickel
Purity and ferronickel metal recovery rate are relatively low.
In addition, when the percentage that the thick ferronickel particle that dregginess is 50-60% accounts for mixed material B is more than 60%, due to thick nickel
Iron-holder is very high in iron particle so that the electric conductivity of mineral hot furnace material is very good, electrodes in mine hot stove Frequent Accidents；Work as slag inclusion
When the percentage that the thick ferronickel particle measured as 50-60% accounts for mixed material B is less than 25%, the mesh of lifting mineral hot furnace production capacity is not had again
's.
The general structure of existing rotary kiln is：In rotary kiln three sections, i.e. low-temperature zone are divided into from kiln tail to kiln hood
(i.e. dryer section), middle-temperature section (i.e. preheating section), high temperature section (i.e. furnace zone), material is fed by kiln tail, successively by dryer section, pre-
Hot arc, high temperature section, finally discharged from kiln hood.
Certainly, the carbonaceous reducing agent described in the step of embodiments of the invention 1~4 (5) can also use breeze merely
Or semi-coke end, bituminous coal or anthracite etc. can also be used.But breeze or semi-coke end are phosphorous low, carbonaceous reducing agent is from burnt
During the combination at last or semi-coke end or both, later product quality will not be had an impact.
Embodiments of the invention 1~3 can do following improvement：
(1) lateritic nickel ore in step (1) is dried through dry kiln, and the kiln temperature of dry kiln is preferably 1000-
1050 DEG C, drying time can be foreshortened to 20-30 minutes, improve production efficiency.
(2) lateritic nickel ore drying to moisture content is 17-20% in step (1), has both been beneficial to crush, has avoided airborne dust again.
(3) particle diameter of dolomite described in step (3) is≤3mm, and the granularity of dolomite is small, and its specific surface area is bigger,
Contact is more abundant.
(4) particle diameter of lime stone described in step (7) is 5-20mm, prevents from blocking the feed pipe of mineral hot furnace.
(5) molten iron containing dilval that step (8) obtains directly send cast iron machine cast pig or directly as stainless steel
Base-material produces stainless steel.
Claims (7)
1. using the method for rotary kiln for directly reducing-RKEF combination methods production ferronickel, comprise the following steps：
(1) lateritic nickel ore is dried, obtains dried lateritic nickel ore, it is standby；
(2) appropriate dried lateritic nickel ore is taken to carry out scalping, broken, dusting cover, screening obtains particle diameter≤8mm lateritic nickel ore；
(3) lateritic nickel ore for the particle diameter≤8mm for obtaining step (2) mixes with carbonaceous reducing agent, dolomite, obtains batch mixing A, carbon
The mass percent that matter reducing agent accounts for batch mixing A is 17-25%, and the mass percent that dolomite accounts for batch mixing A is 0-3%；
(4) after batch mixing A being made into pelletizing, it is sent into the first rotary kiln baking and obtains calcining, material always stops in the first rotary kiln
It is 150-260min to stay the time, and the temperature of furnace zone is 700-1300 DEG C in the first rotary kiln；
Calcining caused by (5) first rotary kilns obtains the thick ferronickel particle that dregginess is 50-60% through water quenching, broken, magnetic separation；
(6) dregginess obtained to step (5) is that obtained in appropriate step (1) do is added in 50-60% thick ferronickel particle
Lateritic nickel ore after dry is mixed, and obtains mixed material B, and the percentage that the thick ferronickel particle that dregginess is 50-60% accounts for mixed material B is
45-75%；
(7) lime stone is added into mixed material B, and is sent into the second rotary kiln baking together, material always stops in the second rotary kiln
It is 90-120min to stay the time, and the temperature of furnace zone is 750-800 DEG C in the second rotary kiln, the discharge outlet of the second rotary kiln
Temperature of charge is 750-800 DEG C；
(8) calcining come out from the second rotary kiln is direct plungeed into mineral hot furnace and melted, the secondary voltage of mineral hot furnace is 275-
315V, primary current 380-420A, the temperature of molten iron is 1500-1540 DEG C in mineral hot furnace, obtains the molten iron containing ferronickel.
2. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：Lateritic nickel ore in step (1) is dried through dry kiln, and the kiln temperature of dry kiln is 1000-1050 DEG C.
3. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：Lateritic nickel ore drying to moisture content is 17-20% in step (1).
4. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：Carbonaceous reducing agent described in step (3) is the combination at breeze or semi-coke end or both.
5. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：The particle diameter of dolomite described in step (3) is≤3mm.
6. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：The particle diameter of lime stone described in step (7) is 5-20mm.
7. a kind of method that ferronickel is produced using rotary kiln for directly reducing-RKEF combination methods according to claim 1, it is special
Sign is：The molten iron containing dilval that step (8) obtains directly send cast iron machine cast pig or directly as stainless steel base-material
Produce stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009624.3A CN106636625B (en) | 2017-01-06 | 2017-01-06 | Using the method for rotary kiln for directly reducing RKEF combination methods production ferronickel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710009624.3A CN106636625B (en) | 2017-01-06 | 2017-01-06 | Using the method for rotary kiln for directly reducing RKEF combination methods production ferronickel |
Publications (2)
| Publication Number | Publication Date |
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| CN106636625A CN106636625A (en) | 2017-05-10 |
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| CN107267776B (en) * | 2017-07-07 | 2019-11-08 | 沈阳有色金属研究院 | A kind of method of lateritic nickel ore direct-reduction-beneficiation enrichment production ferronickel |
| CN108531738A (en) * | 2018-05-08 | 2018-09-14 | 广东广青金属科技有限公司 | Utilize the method for RKEF process Ni and Cr contained dangerous wastes |
| CN110284011A (en) * | 2019-07-12 | 2019-09-27 | 扬州一川镍业有限公司 | A kind of low-grade laterite nickel ore semi-molten state production nickel pig iron technique |
| CN110819791A (en) * | 2019-12-19 | 2020-02-21 | 广东广青金属科技有限公司 | Production process of nickel-containing molten iron with low iron distribution and low silicon-magnesium ratio for submerged arc furnace |
| CN110819804A (en) * | 2019-12-19 | 2020-02-21 | 广东广青金属科技有限公司 | Low iron-distribution and low silicon-magnesium ratio furnace charge for submerged arc furnace and production process |
| CN112080636B (en) | 2020-08-17 | 2022-11-15 | 广东邦普循环科技有限公司 | Method for producing battery-grade nickel sulfate salt by using laterite-nickel ore |
| CN118064712B (en) * | 2024-04-23 | 2024-06-28 | 扬州一川镍业有限公司 | Method for processing silicon-containing solid waste and using method of RKEF technology in laterite-nickel ore |
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| CN100469912C (en) * | 2007-04-16 | 2009-03-18 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101418356A (en) * | 2007-10-28 | 2009-04-29 | 沾化庆翔金属材料有限公司 | A kind of from nickel oxide ore the method for refining ferronickel alloy |
| CN101660017B (en) * | 2008-08-28 | 2011-04-13 | 宝山钢铁股份有限公司 | Process for refining molten iron by directly using low-grade iron ores |
| CN103643034A (en) * | 2013-12-12 | 2014-03-19 | 毛黎生 | Method for reducing granular ferronickel through laterite-nickel ore in two-stage rotary kiln |
| CN105463185B (en) * | 2015-04-13 | 2023-11-24 | 广西北港新材料有限公司 | Duplex method for producing ferronickel by adopting magnetic separation-RKEF |
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