CN107619897A - A kind of system and method that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas - Google Patents
A kind of system and method that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas Download PDFInfo
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- CN107619897A CN107619897A CN201710900313.6A CN201710900313A CN107619897A CN 107619897 A CN107619897 A CN 107619897A CN 201710900313 A CN201710900313 A CN 201710900313A CN 107619897 A CN107619897 A CN 107619897A
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Abstract
The present invention relates to a kind of system and method that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas, wherein, system includes：The pyrolysis of coal device that is sequentially connected, cooling purifying device, desulfurizer, partial oxidation unit, shaft furnace and molten divide stove；Method includes：High temperature coal pyrolysis gas sequentially enters cooling purifying device, desulfurizer and partial oxidation unit caused by pyrolysis of coal device；CH in the coal pyrolysis gas of entering part oxidation unit4、CO、H2Partial oxidation reaction, while the reaction condition of control section oxidation unit occurs with oxygen, to the CO in gas after reaction2And H2O content is controlled, and then controls CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio；Carry out the also Primordial Qi after partial oxidation reaction and be passed through reduction shaft furnace to the iron and nickel in pelletizing described in laterite nickel ore oxidized pellet progress selective reduction；The pelletizing after reduction, which enters to melt, divides stove melting, obtains high-grade nickel ferroalloy.The present invention has that cost is low, production capacity is big, the advantages such as energy consumption of unit product is low.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of to reduce laterite nickel ore and producing ferronickel using coal pyrolysis gas
System and method.
Background technology
Nickel has the premium properties such as corrosion-resistant, fusing point is high, ferromagnetism, is various special steels, heat-resisting alloy, anticorrosive conjunction
Gold, magnetic alloy, the important source material of CEMENTED CARBIDE PRODUCTION, in steel, military project, space flight, machine-building, chemical industry, communicator
Material etc. has been widely used, and is important strategic resource.Minable mineral deposit is mainly nickel sulfide ore and lateritic nickel ore.With
Nickel sulfide ore gradually use up and the continuous growth of nickel demand, utilization lateritic nickel ore resource seem increasingly necessary.It is red
Native nickel minerals be by iron content magnesium silicate mineral ultramafic rock through it is long-term weathering it is rotten formed, upper strata is limonite type,
Mainly it is made up of the oxide of iron, centre is transition zone, and lower floor is garnierite layer.Lateritic nickel ore aboundresources, mining cost
Low, dressing and smelting process tends to be ripe, can produce a variety of intermediate products such as nickel oxide, ferronickel, be the main source of following nickel resources.Mesh
Pre-treatment lateritic nickel ore technique is broadly divided into pyrogenic process, wet method and wet three kinds of the combined process of fire, and height is typically handled using thermal process
The low iron lateritic nickel ore of magnesium, major product is dilval, can directly apply to stainless steel production.Thermal process handles laterite nickel
Ore deposit production dilval has the advantages that flow is short, efficiency high, but energy consumption is higher.Wet processing mainly handles middle-low grade laterite
Nickel minerals, its cost is lower than pyrogenic process, but the technics comparing complexity of wet-treating, long flow path, process conditions are to equipment requirement height.
The content of the invention
The present invention is in view of the shortcomings of the prior art, it is proposed that a kind of to reduce laterite nickel ore and producing ferronickel using coal pyrolysis gas
System and method, using cheap coal pyrolysis gas, by non-catalytic partial oxidation method, the higher also Primordial Qi of oxidizability is produced,
To nickel in selective reduction lateritic nickel ore and part iron, low-sulfur phosphorus and the few high-quality dilval of impurity are obtained, is had
Cost is low, production capacity is big, the low advantage of energy consumption of unit product.
In order to solve the above technical problems, the present invention proposes and a kind of reduces laterite nickel ore and producing ferronickel using coal pyrolysis gas
System, it is characterised in that including：Pyrolysis of coal device, cooling purifying device, desulfurizer, partial oxidation unit, shaft furnace and molten point
Stove, wherein：Pyrolysis of coal device, cooling purifying device and the desulfurizer are sequentially connected；The partial oxidation unit with it is described
Desulfurizer connects, and the gas componant in the coal pyrolysis gas is adjusted by way of partial oxidation, to control the laterite nickel
The reducing degree of iron in ore deposit；The shaft furnace is connected with the partial oxidation unit, and reduction is used as by the use of the gas after partial oxidation
Gas, lateritic nickel ore is reduced；Described melt divides stove to be connected with the shaft furnace, raw by the lateritic nickel ore pelletizing melting after reduction
Produce ferronickel.
Further, the gas componant in the regulation coal pyrolysis gas is to the CO in gas after reaction2And H2O content
It is controlled, and then controls CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio.
Further, the cooling purifying device includes：The scrubbing tower and dehydrator being sequentially connected, wherein, the washing
Tower is provided with pyrolysis gas entrance, and the dehydrator is provided with the outlet of cooling gas, the heat of the pyrolysis gas entrance and the pyrolysis of coal device
Venting one's spleen, outlet is connected, and the cooling gas outlet is connected with the cooling gas entrance of the desulfurizer；For to high temperature coal pyrolysis gas
Carry out the water in cooling dedusting, separating tar and removing coal pyrolysis gas；The desulfurized gas outlet of the desulfurizer and the part
The sweet gas entrance of oxidation unit is connected, for carrying out desulfurization process to the gas after cooling.
Further, the partial oxidation unit is non-catalytic partial oxidation reactor, and it includes：It is sweet gas entrance, pure
Oxygen intake, burner and also Primordial Qi outlet, wherein, the also Primordial Qi outlet is connected with the also Primordial Qi entrance of the shaft furnace, is used for
The coal pyrolysis gas being passed through is lighted at burner with oxygen, it is anti-that combustion heat release is carried out in the non-catalytic partial oxidation reactor
Should.
Further, the shaft furnace includes：Also Primordial Qi entrance, stock gas outlet, charge door and discharging opening, wherein, institute
The top that charge door is located at the shaft furnace is stated, the discharging opening divides stove to be connected and positioned at the bottom of the shaft furnace, use with described melt
Molten divide in stove is passed through in the lateritic nickel ore pelletizing after by reduction.
In another aspect of this invention, it is proposed that one kind carries out reduction laterite nickel ore and producing ferronickel using system noted earlier
Method, it is characterised in that comprise the following steps：
A. high temperature coal pyrolysis gas caused by pyrolysis of coal device sequentially enters cooling purifying device, desulfurizer and partial oxidation dress
Put；
B. into the CH in the coal pyrolysis gas of the partial oxidation unit4、CO、H2Partial oxidation reaction occurs with oxygen, simultaneously
The reaction condition of the partial oxidation unit is controlled, to the CO in gas after reaction2And H2O content is controlled, and then is controlled
CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio；
C. carry out the also Primordial Qi after partial oxidation reaction and be passed through reduction shaft furnace to laterite nickel ore oxidized pellet progress selective reduction
Iron and nickel in the pelletizing；
D. the pelletizing after reducing, which enters to melt, divides stove melting, obtains high-grade nickel ferroalloy.
Further, the reaction condition is：Reaction temperature is 780-850 DEG C, pressure 0.2MPa, in coal pyrolysis gas
CH4Content is 17-22%, CO2For 6-10%, CO 25-33%, H2For 30-40%.
Further, the reaction condition in the step b also includes：Oxygen and CH in coal pyrolysis gas4Volume ratio is 1.
Further, in the step b, CO is contained in the gas after partial oxidation reaction2+H2O content is 18-23%, CH4
Content is 5-7%, CO 25-37%, H2For 30-40%.
Further, in the step b, the reduction temperature degree after partial oxidation reaction is 750-820 DEG C.
The present invention comprises at least following beneficial effect：
1）The present invention using caused by cheap pyrolysis of coal coal pyrolysis gas progress lateritic nickel ore reduction shaft furnace, with coke-stove gas,
Natural gas is compared, and its price is low, and by pyrolysis gas in partial oxidation unit and oxygen reaction, improves gas temperature, nothing
Need external heat stove to invest, reduce cost of investment and operation cost；
2）The also Primordial Qi of the lateritic nickel ore of the present invention is gaseous reducing agent, by controlling oxygen and CH in coal pyrolysis gas4Volume
Than can control CO/（CO+CO2）Ratio, H2/（H2+H2O）Ratio, and then iron and nickel in alternative reduction lateritic nickel ore, make
Nickel Restore All, regulate and control the reducing degree of iron, make its partial reduction, obtain high-quality dilval；
3）The present invention is using the gaseous reducing agent of cleaning, P ＜ 0.035%, S ＜ 0.03%, and C in the dilval of production,
Si ＜ 0.04%；
4）CO in the present invention also Primordial Qi2Ratio is high, can avoid occurring in shaft furnace CO analysis carbon reaction, improve CO utilization ratios；
5）The present invention uses non-catalytic partial oxidation method, and desulfurization is required to reduce, reduces desulphurization plant operating cost, and a whole set of
System process is simple.
Brief description of the drawings
Fig. 1 is the structure diagram of present system.
Fig. 2 is the structural representation of present system.
Wherein, pyrolysis of coal device 1, pyrolysis gas outlet 101, cooling purifying device 2, pyrolysis gas entrance 201, the outlet of cooling gas
202, desulfurizer 3, cooling gas entrance 301, desulfurized gas outlet 302, partial oxidation unit 4, sweet gas entrance 401, purity oxygen
Entrance 402, also Primordial Qi outlet 403, also shaft furnace 5, Primordial Qi entrance 501, stock gas outlet 502, charge door 503, discharging opening
504, it is molten to divide stove 6.
Embodiment
In order that those skilled in the art more fully understand technical scheme, with reference to specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, without being understood that
For limitation of the present invention.Unreceipted particular technique or condition in embodiment, according to the skill described by document in the art
Art or condition are carried out according to product description.
The present invention proposes a kind of system that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas, according to the reality of the present invention
Example is applied, Fig. 1 is the structure diagram of present system, and Fig. 2 is the structural representation of present system, shown referring to Figures 1 and 2,
System of the present invention includes：Pyrolysis of coal device 1, cooling purifying device 2, desulfurizer 3, partial oxidation unit 4, the and of shaft furnace 5
It is molten to divide stove 6, wherein：Pyrolysis of coal device, cooling purifying device and the desulfurizer are sequentially connected；The partial oxidation unit with
The desulfurizer connection, adjusts the gas componant in the coal pyrolysis gas, to gas after reaction by way of partial oxidation
In CO2And H2O content is controlled, and then controls CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio, with control
The reducing degree of iron in the lateritic nickel ore；The shaft furnace is connected with the partial oxidation unit, utilizes the gas after partial oxidation
Body reduces as also Primordial Qi to lateritic nickel ore；Described melt divides stove to be connected with the shaft furnace, by the lateritic nickel ore ball after reduction
Group's melting, produces ferronickel.
According to some embodiments of the present invention, the specific species of pyrolysis of coal device of the present invention is unrestricted, Ke Yiwei
One kind of fixed bed, fluid bed and entrained-flow reactor.
According to an embodiment of the invention, shown in reference picture 2, the cooling purifying device 2 includes：The scrubbing tower being sequentially connected
And dehydrator（Not shown in figure）, wherein, the scrubbing tower is provided with pyrolysis gas entrance 201, and the dehydrator is provided with cooling gas and gone out
Mouthfuls 202, the pyrolysis gas entrance is connected with the pyrolysis gas outlet 101 of the pyrolysis of coal device, it is described cool down gas export with it is described
The cooling gas entrance 301 of desulfurizer 3 is connected, and first cool dedusting and separation are carried out to high temperature coal pyrolysis gas through the scrubbing tower
Tar, the water in coal pyrolysis gas is removed subsequently into the dehydrator.
According to an embodiment of the invention, shown in reference picture 2, desulfurized gas outlet 302 and the part of the desulfurizer 3
The sweet gas entrance 401 of oxidation unit 4 is connected, for carrying out desulfurization process to the gas after cooling.
According to an embodiment of the invention, shown in reference picture 2, the partial oxidation unit 4 includes：It is sweet gas entrance 401, pure
Oxygen intake 402, burner（Not shown in figure）403 are exported with Primordial Qi is gone back, wherein, the also Primordial Qi outlet is gone back with the shaft furnace
Primordial Qi entrance is connected, and for the coal pyrolysis gas being passed through to be lighted at burner with oxygen, is reacted in the non-catalytic partial oxidation
Combustion heat release reaction is carried out in device.
According to some embodiments of the present invention, partial oxidation unit of the present invention is non-catalytic partial oxidation reactor,
Using purity oxygen as combustion adjuvant, coal pyrolysis gas is lighted with oxygen at the burner, and the combustion space in the reactor is carried out
Combustion heat release reacts, wherein CH4CO and H is generated with oxygen reaction2, H2Water is generated with oxygen reaction, CO generates with oxygen reaction
CO2, three reaction releasing heats, realize and pyrolysis gas temperature adjusted and lifted to gas componant to shaft furnace claimed range, reactor
It is interior to improve gas temperature, invested without external heat stove, reduce cost of investment and operation cost；Preferably, the part oxygen
Makeup is set to hot wall stove reactor, Non-water-cooled chuck, and liner is refractory brick and castable structure, can reduce heat loss, improves system
The reduction temperature degree taken.
According to an embodiment of the invention, shown in reference picture 2, the shaft furnace 5 includes：Also Primordial Qi entrance 501, stock gas go out
Mouthfuls 502, charge door 503 and discharging opening 504, wherein, the charge door is located at the top of the shaft furnace, the discharging opening with it is described
It is molten to divide stove to be connected and positioned at the bottom of the shaft furnace, smelting is carried out in stove 6 for the lateritic nickel ore pelletizing after reduction to be passed through to melt to divide
Refining, obtains high-quality dilval；According to some embodiments of the present invention, the specific species of shaft furnace of the present invention is unrestricted
System, the present invention can use MIDREX, HYL, PERED shaft furnace.
In another aspect of this invention, there is provided a kind of to carry out reducing lateritic nickel ore production nickel using foregoing system
The method of iron, shown in reference picture 1, comprise the following steps：
A. high temperature coal pyrolysis gas caused by pyrolysis of coal device enters cooling purifying device, and cooling is first carried out through the scrubbing tower and is removed
Dirt and separating tar, the water in coal pyrolysis gas is removed subsequently into the dehydrator, Oil-gas Separation obtains purification
Coal pyrolysis gas, then desulfurizer is passed through, remove the sulphur in coal pyrolysis gas, re-entering part oxidation unit.
B. into the CH in the coal pyrolysis gas of the partial oxidation unit4、CO、H2Partial oxidation reaction, control occurs with oxygen
The reaction temperature for making the partial oxidation unit is 780-850 DEG C, pressure 0.2MPa, CH in coal pyrolysis gas4Content is 17-
22%、CO2For 6-10%, CO 25-33%, H2For 30-40%, meanwhile, oxygen and CH in coal pyrolysis gas4Volume ratio is 1, at this
Under part, by controlling the volume ratio of oxygen and coal pyrolysis gas, to the CO in gas after reaction2And H2O content is controlled, and is entered
And control CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio so that nickel reduction is unaffected, and the reduction of iron is controlled
System, so as to control the degree of metalization of iron.
According to some embodiments of the present invention, conventional gas partial oxidation reaction temperature is 1260-1450 DEG C, reaction temperature
Degree is high, requires high to the refractory material of reactor, wherein O2/CH4For 0.6, that is, 2CH occurs4+O2=2CO+4H2.O in the present invention2
With coal pyrolysis gas CH4Ratio is 1, and belongs to the reaction of low temperature partial oxidation combustion, due to oxygen excess, is contained after reaction in gas
CO2+H2O is 18-23%, CH4Content is 5-7%, CO 25-37%, H2For 30-40%, while high content CO22CO=C+ can be suppressed
CO2Reaction is carried out, and reduces carbon black generation, and partial oxidation unit Outlet Gas Temperature is 750-820 DEG C after reaction, CO+H2For 62-
72%。
C. carry out the also Primordial Qi after partial oxidation reaction and be passed through reduction shaft furnace to laterite nickel ore oxidized pellet progress selectivity
Reduce the iron and nickel in the pelletizing.
D. the pelletizing after reducing, which enters to melt, divides stove melting, obtains high-grade nickel ferroalloy.
According to some embodiments of the present invention, in the lateritic nickel ore, nickel grade is 1%-3%, Iron grade 10%-45%；
Using gas reduction lateritic nickel ore, alternative reduces the iron and nickel in lateritic nickel ore, makes nickel Restore All, regulate and control the reduction of iron
Degree, make its partial reduction, really realization is controllable to nickel grade in product, and reduces S in ferronickel, P content.
Embodiment 1：After coal pyrolysis gas composition and partial oxidation after cooling dedusting, isolation of purified, desulfurization process also
Primordial Qi composition is shown in Table 1.It can be seen that CH in pyrolysis gas4Reach 20.39%, wherein S<0.1%.Coal pyrolysis gas entering part oxygen after desulfurization
Makeup is put, combustion oxygen and CH in coal pyrolysis gas4Volume ratio is 1.Partial oxidation unit reaction temperature is 850 DEG C, reaction pressure
For 0.2MPa, go out the device 820 DEG C go back Primordial Qi, are passed through reduction shaft furnace, and iron, nickel are urged in the pelletizing that reduction is completed in shaft furnace bottom
Under change effect, remaining CH in gas4With CO2、H2O is carried out from reformation generation CO and H2, the acid pellet on reduction shaft furnace top.Adopt
With gaseous reducing agent, nickel content in regulation and control product dilval is really realized, and reduces the content of S, P, C in dilval,
Be advantageous to stainless steel smelting.
The pyrolysis gas composition of table 1/%
| Species | N2 | CO2 | CO | CH4 | H2 | H2O | Other |
| Pyrolysis gas | 2.64 | 9.87 | 31.15 | 20.39 | 34.59 | 0 | 1.36 |
| Also Primordial Qi | 2.15 | 14.14 | 35.25 | 5.12 | 36.12 | 6.2 | 1.02 |
The lateritic nickel ore, wherein nickel grade are 1.7%, Iron grade 13%, pellet size 10-14mm, and pelletizing is gone back in shaft furnace
The former time is 4 hours, and it is 0.8MPa to erect furnace pressure, and the lateritic nickel ore reducting pellet that shaft furnace is discharged is delivered to melt and divides stove to be melted
Refining, obtains high-grade（Ni 26%）It is few with impurity（C, Si ＜ 0.04%）Ferronickel.
Embodiment 2：After coal pyrolysis gas composition and partial oxidation after cooling dedusting, isolation of purified, desulfurization process also
Primordial Qi composition is shown in Table 2.It can be seen that pyrolysis gas CH4Reach 17.21%, wherein S<0.1%.Coal pyrolysis gas entering part oxidation after desulfurization
Device, combustion oxygen and CH in coal pyrolysis gas4Volume ratio is 1.Partial oxidation unit reaction temperature is 780 DEG C, and reaction pressure is
0.2MPa, go out the device 750 DEG C go back Primordial Qi, are passed through reduction shaft furnace, iron, nickel catalysis in the pelletizing that reduction is completed in shaft furnace bottom
Under effect, remaining CH in gas4With CO2、H2O is carried out from reformation generation CO and H2, the acid pellet on reduction shaft furnace top.Using
Gaseous reducing agent, nickel content in regulation and control product dilval is really realized, and reduce the content of S, P, C in dilval, had
Beneficial to stainless steel smelting.
The pyrolysis gas composition of table 2/%
| Species | N2 | CO2 | CO | CH4 | H2 | H2O | Other |
| Pyrolysis gas | 2.65 | 8.84 | 29.46 | 17.21 | 40 | 0 | 1.84 |
| Also Primordial Qi | 1.97 | 12.38 | 32.51 | 6.11 | 36.35 | 9.66 | 1.02 |
The lateritic nickel ore, wherein nickel grade are 2.2%, Iron grade 44%, pellet size 10-14mm, and pelletizing is gone back in shaft furnace
The former time is 4 hours, and it is 0.8MPa to erect furnace pressure.The lateritic nickel ore reducting pellet that shaft furnace is discharged, which is delivered to, to melt divides stove to be melted
Refining, obtains high-grade（Ni 15%）It is few with impurity（C, Si ＜ 0.04%）Ferronickel.
Inventor has found, according to system and the side of the present invention that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas
Method, the reduction shaft furnace of lateritic nickel ore is carried out using coal pyrolysis gas caused by cheap pyrolysis of coal, with coke-stove gas, natural gas phase
Than, its price is low, and by pyrolysis gas in partial oxidation unit and oxygen reaction, improves gas temperature, without outside plus
Hot stove is invested, and reduces cost of investment and operation cost；The also Primordial Qi of the lateritic nickel ore of the present invention is gaseous reducing agent simultaneously, is passed through
Control oxygen and CH in coal pyrolysis gas4Volume ratio, can control CO/（CO+CO2）Ratio, H2/（H2+H2O）Ratio, so it is optional
Iron and nickel in selecting property reduction lateritic nickel ore, make nickel Restore All, regulate and control the reducing degree of iron, make its partial reduction, obtain excellent
The dilval of matter；In addition, gaseous reducing agent of the present invention using cleaning, P ＜ 0.035%, S ＜ in the dilval of production
0.03%, and C, Si ＜ 0.04%, the present invention go back CO in Primordial Qi2Ratio is high, can avoid occurring in shaft furnace CO analysis carbon reaction,
Improve CO utilization ratios；And the present invention uses non-catalytic partial oxidation method, desulfurization is required to reduce, reduces desulphurization plant fortune
Row cost, and whole system technological process is simple.
In the present invention, unless otherwise clearly defined and limited, the term such as term " connected ", " connection " should do broad sense reason
Solution, for example, it may be fixedly connected or be detachably connected, or integrally；Can be mechanical connection or electricity
Connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two element internals connection or two
The interaction relationship of element.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or 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.Moreover, specific features, structure, material or the feature of description can be any
Combined in an appropriate manner in individual or multiple embodiments or example.In addition, in the case of not conflicting, the technology of this area
Different embodiments or example and the feature of different embodiments or example described in this specification can be combined by personnel
And combination.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification, meanwhile, for those of ordinary skill in the art, the think of according to the application
Think, in specific embodiments and applications there will be changes.
Claims (10)
- A kind of 1. system that laterite nickel ore and producing ferronickel is reduced using coal pyrolysis gas, it is characterised in that including：Pyrolysis of coal device, Cooling purifying device, desulfurizer, partial oxidation unit, shaft furnace and it is molten divide stove, wherein：Pyrolysis of coal device, cooling purifying device and the desulfurizer are sequentially connected；The partial oxidation unit is connected with the desulfurizer, is adjusted by way of partial oxidation in the coal pyrolysis gas Gas componant, to control the reducing degree of iron in the lateritic nickel ore；The shaft furnace is connected with the partial oxidation unit, by the use of the gas after partial oxidation as also Primordial Qi, to lateritic nickel ore Reduced；Described melt divides stove to be connected with the shaft furnace, by the lateritic nickel ore pelletizing melting after reduction, produces ferronickel.
- 2. system according to claim 1, it is characterised in that the gas componant in the regulation coal pyrolysis gas is to reaction CO in gas afterwards2And H2O content is controlled, and then controls CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio.
- 3. system according to claim 1, it is characterised in that the cooling purifying device includes：The washing being sequentially connected Tower and dehydrator, wherein, the scrubbing tower is provided with pyrolysis gas entrance, and the dehydrator is provided with the outlet of cooling gas, the pyrolysis gas Entrance is connected with the pyrolysis gas outlet of the pyrolysis of coal device, the cooling gas outlet and the cooling gas entrance of the desulfurizer It is connected, for carrying out the water in cooling dedusting, separating tar and removing coal pyrolysis gas to high temperature coal pyrolysis gas；The desulfurizer Desulfurized gas outlet be connected with the sweet gas entrance of the partial oxidation unit, for after cooling gas carry out desulfurization at Reason.
- 4. system according to claim 1, it is characterised in that the partial oxidation unit reacts for non-catalytic partial oxidation Device, it includes：Sweet gas entrance, purity oxygen entrance, burner and also Primordial Qi outlet, wherein, the also Primordial Qi outlet with it is described perpendicular The also Primordial Qi entrance of stove is connected；For the coal pyrolysis gas being passed through to be lighted at burner with oxygen, in the Non-catalytic partial oxygen Change and combustion heat release reaction is carried out in reactor.
- 5. system according to claim 1, it is characterised in that the shaft furnace includes：Also Primordial Qi entrance, stock gas go out Mouth, charge door and discharging opening, wherein, the charge door is located at the top of the shaft furnace, and the discharging opening divides stove phase with described melt Even and positioned at the bottom of the shaft furnace, for the lateritic nickel ore pelletizing after reduction to be passed through into molten divide in stove.
- 6. a kind of system using any one of claim 1-5 carries out the method for reducing laterite nickel ore and producing ferronickel, its It is characterised by, comprises the following steps：A. high temperature coal pyrolysis gas caused by pyrolysis of coal device sequentially enters cooling purifying device, desulfurizer and partial oxidation dress Put；B. into the CH in the coal pyrolysis gas of the partial oxidation unit4、CO、H2Partial oxidation reaction, same time control occurs with oxygen The reaction condition of the partial oxidation unit is made, to the CO in gas after reaction2And H2O content is controlled, and then is controlled CO/（CO+CO2）Ratio and H2/（H2+H2O）Ratio；C. carry out the also Primordial Qi after partial oxidation reaction and be passed through reduction shaft furnace to laterite nickel ore oxidized pellet progress selective reduction Iron and nickel in the pelletizing；D. the pelletizing after reducing, which enters to melt, divides stove melting, obtains high-grade nickel ferroalloy.
- 7. according to the method for claim 6, it is characterised in that the reaction condition is：Reaction temperature is 780-850 DEG C, Pressure is 0.2MPa, CH in coal pyrolysis gas4Content is 17-22%, CO2For 6-10%, CO 25-33%, H2For 30-40%.
- 8. according to the method for claim 6, it is characterised in that the reaction condition in the step b also includes：Oxygen and coal CH in pyrolysis gas4Volume ratio is 1.
- 9. according to the method for claim 6, it is characterised in that in the step b, contain in the gas after partial oxidation reaction There is CO2+H2O content is 18-23%, CH4Content is 5-7%, CO 25-37%, H2For 30-40%.
- 10. according to the method for claim 6, it is characterised in that in the step b, the also Primordial Qi after partial oxidation reaction Temperature is 750-820 DEG C.
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| CN111621650A (en) * | 2020-06-12 | 2020-09-04 | 中南大学 | Method for extracting metallic nickel from laterite-nickel ore |
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- 2017-09-28 CN CN201710900313.6A patent/CN107619897A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111621650A (en) * | 2020-06-12 | 2020-09-04 | 中南大学 | Method for extracting metallic nickel from laterite-nickel ore |
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