CN112030006A - Furnace screening method suitable for nickel matte converting reduction furnace - Google Patents
Furnace screening method suitable for nickel matte converting reduction furnace Download PDFInfo
- Publication number
- CN112030006A CN112030006A CN202010700967.6A CN202010700967A CN112030006A CN 112030006 A CN112030006 A CN 112030006A CN 202010700967 A CN202010700967 A CN 202010700967A CN 112030006 A CN112030006 A CN 112030006A
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- China
- Prior art keywords
- furnace
- converting
- screen
- slag
- nickel matte
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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
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a furnace screening method suitable for nickel matte converting, which comprises the following steps: adding the last pack of low-nickel matte into the converting furnace, discharging furnace slag when the Fe content in the nickel matte is 10-15%, continuously carrying out converting until the converting furnace enters a screening furnace period, maintaining the blast state in the converting furnace during the screening furnace period, continuously adding a carbonaceous reducing agent and quartz stones into the converting furnace through a quantitative feeder, reducing metal oxides in the furnace slag into high-nickel matte, stopping adding the carbonaceous reducing agent 3-5 min after the screening furnace operation, only adding the quartz stones, and then stopping blowing to remove slag. The method can produce the high nickel matte with different Fe contents and the converting furnace slag with lower Ni and Co contents, and the alloy phase in the high nickel matte effectively captures the rare and noble metals and can meet the requirements of different downstream production processes. The method simultaneously reduces low-altitude pollution and labor intensity.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metallurgy, and particularly relates to a furnace screening method suitable for a nickel matte converting reduction furnace.
Background
In the traditional blowing process of the nickel matte converter in China, a furnace screening process is arranged at the later stage of slagging. The purpose of the sieve furnace is to oxidize most of the residual FeS in the high nickel matte into slag for removal, and simultaneously obtain the high nickel matte with Fe content less than 4%. The furnace screening period refers to the process of continuously blowing to the end point after the last pack of slag (shallow blowing slag) is discharged by blowing (at the moment, the Fe content in the nickel matte is 10-15%).
In the traditional blowing process of the nickel matte converter, the iron-silicon ratio of sieve slag generated by deep blowing is controlled to be about 2.0, and Fe in the slag3O4The content can reach more than 50 percent, and the viscosity is higher. In the later stage of slagging, Ni and Co are oxidized greatly and then discharged along with slag, and particularly, the direct yield of Co is very low. Some nickel smelting enterprises have tried to add carbonaceous reducing agent into the furnace through a boat-shaped feeder after the sieve slag is generated, so as to reduce Ni and Co in the slag into high nickel matte, but the effect is not obvious. Particularly, when high nickel matte with high alloy phase content and Fe content of 1-1.5% is produced, the recovery rate of Co is lower.
Therefore, the screen furnace process of nickel matte converting is still to be further improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a screening furnace method suitable for nickel matte converting, which can improve the recovery rate of nickel and cobalt elements, reduce low-altitude pollution and reduce labor intensity.
In one aspect of the invention, a screen furnace process suitable for nickel matte converting is presented. According to an embodiment of the invention, the method comprises: after the last pack of slag is discharged by converting (at the moment, the Fe content in the nickel matte is 10-15%), the converting furnace enters a furnace screening period, the furnace screening period maintains the blast state and the reducing atmosphere in the converting furnace, a carbonaceous reducing agent and quartz stone are continuously added into the converting furnace through a quantitative feeder, and metal oxides in the slag are reduced to enter high-nickel matte; and (3) stopping adding the carbonaceous reducing agent, only adding quartz stone and stopping blowing to remove slag in the last 3-5 min of the furnace screening period so as to obtain high-nickel matte with required quality and screen furnace slag with lower Ni and Co contents.
According to the method for the nickel matte converting screen furnace, provided by the embodiment of the invention, the blast state in the converting furnace is maintained in the screen furnace period, so that the carbonaceous reducing agent and the quartz stone which are added subsequently are fully contacted with the stirred melt to form a reducing atmosphere, good kinetic and thermodynamic conditions are created for the reduction reaction of the metal oxide, and more Ni and Co elements enter the high-nickel matte. Meanwhile, as the carbonaceous reducing agent and the quartz are continuously added under the condition that the converting furnace mouth does not rotate out of the smoke collecting hood, the method avoids the scattered smoke generated when auxiliary materials are added from the furnace mouth by adopting a ship-shaped feeder in the prior art, improves the operation environment, reduces low-altitude pollution and reduces the labor intensity. Therefore, the method can improve the metal recovery rate, reduce low-altitude pollution and reduce labor intensity, thereby obtaining high-quality high-nickel matte and sieve slag with lower valuable metal elements.
In addition, the screen furnace method for nickel matte converting according to the above embodiment of the present invention may also have the following additional technical features:
in some embodiments of the invention, the carbonaceous reducing agent is added during the screening period to create a specific reducing atmosphere in the slag phase, controlling the proportion of Co entering the slag.
In some embodiments of the invention, the carbonaceous reducing agent is added in an amount of 0.2 to 2.5t and the quartz stone is added in an amount of 0.2 to 4t during the screening period.
In some embodiments of the invention, the carbonaceous reducing agent is stopped and only 0.1 to 0.4t of the quartz stone is added in the last 3 to 5min of the screening period.
In some embodiments of the present invention, the feeding rate of the carbonaceous reducing agent is 1 to 10 t/h.
In some embodiments of the invention, the feeding rate of the quartz stone is 3-30 t/h.
In some embodiments of the invention, the blast rate of the converting furnace is maintained between 8000 and 30000Nm after the converting furnace enters the screening period3And h, the flue gas at the furnace mouth contains 0.1-1% of CO gas.
In some embodiments of the invention, in the screening period, the rotation angle of the converter is 0-40 degrees in front of the converter on the basis of the normal position.
In some embodiments of the invention, the temperature in the converting furnace is maintained at 1220 to 1280 ℃ after the converting furnace enters the screening furnace period. Therefore, the recovery rate of nickel and cobalt is improved. In some embodiments of the present invention, the molar ratio of iron to silicon in the sieve slag is 0.8 to 1.2.
In some embodiments of the invention, the content of ferroferric oxide in the screen slag is 15-30 wt%.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The following detailed description of the embodiments of the present invention is intended to be illustrative, and not to be construed as limiting the invention.
In one aspect of the invention, a screen furnace process suitable for nickel matte converting is presented. According to an embodiment of the invention, the method comprises: after the last pack of slag (shallow blowing slag) is discharged in the blowing process (at the moment, the Fe content in the nickel matte is 10% -15%), the blowing furnace enters a furnace screening period, the blowing state and the reducing atmosphere in the blowing furnace are maintained, under the condition that a smoke collecting hood is not rotated out of a furnace mouth of the blowing furnace, a carbonaceous reducing agent and quartz stone are added into the blowing furnace through a quantitative feeder, and meanwhile, proper high temperature is maintained so as to obtain high-sulfur nickel and screen slag. The inventor finds that the blowing state in the converting furnace is maintained when the converting furnace enters the screening furnace period, the materials in the converting furnace are kept in a stirring state all the time, and the materials are fully contacted with the carbonaceous reducing agent and the quartz stone which are added subsequently, so that the reduction effect of metal oxides such as Fe, Co, Ni and the like in slag can be effectively improved, the recovery rate of valuable metals is improved, meanwhile, the overflowing and scattering smoke generated when auxiliary materials are added from a furnace opening by adopting a ship-shaped feeder in the prior art is avoided, the operation environment is improved, and the labor intensity is reduced. Therefore, the method can improve the recovery rate of nickel and cobalt elements and reduce the labor intensity, thereby obtaining high-quality high-nickel matte.
The metal oxide in the slag is a metal oxide such as Ni, Co, or Fe, and the carbonaceous reducing agent is a carbonaceous reducing agent such as anthracite or coke. The operation of the converting furnace before entering the screen furnace period belongs to the conventional operation of the existing nickel matte converting reduction, and is not described herein again, and the screen furnace period in the application refers to the process from the last bag of shallow blowing slag discharged from the converting furnace (at this time, the content of Fe in the nickel matte is 10% -15%) to the converting end point. And the time for stopping adding the carbonaceous reducing agent can be determined by the skilled person according to experience, for example, the total time of the whole screening furnace period is Tmin, and the time for stopping adding the carbonaceous reducing agent refers to the last 3-5 min in T.
Furthermore, the low-nickel matte adopted in the application contains about 25-40% of Cu and Ni, 15-30% of Fe, 0.2-2.5 t of S25-30% of single-furnace-level carbonaceous reducing agent and 0.2-4 t of quartz. The inventor finds that the charging rate of the carbonaceous reducing agent and the quartz stone can seriously influence the furnace screening process, the charging rate of the carbonaceous reducing agent is 1-10 t/h, and when the charging rate of the quartz stone is 3-30 t/h, the materials are uniformly mixed and fully reacted, so that a better reduction effect can be realized, the nickel and cobalt recovery rate is improved, and the charging cost is reduced. When the charging rate of the carbonaceous reducing agent and the quartz stone is too high, the materials charged into the furnace can not be completely reacted, the furnace temperature is reduced, and the reduction effect is influenced.
Further, in order to improve the recovery rate of nickel and cobalt, the blast rate of the converting furnace is kept at 8000-30000 Nm after the converting furnace enters the screening furnace period3And h, maintaining the temperature in the converting furnace to be 1220-1280 ℃ after the converting furnace enters the screening furnace period, so that the iron-silicon molar ratio in the finally obtained screening furnace slag is 0.8-1.2, and the content of the ferroferric oxide in the screening furnace slag is 10-30 wt%, thereby reducing the content of the ferroferric oxide in the screening furnace slag compared with the prior art.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
After the converting furnace discharges the last bag of shallow blowing slag (at the moment, the content of Fe in nickel matte is 13%), the converting furnace enters a furnace screening period, the blowing state in the converting furnace is maintained (the blowing rate is 8000-10000 Nm3/h, the temperature is 1230 ℃), the discharged flue gas contains 0.8% of CO, 1t of carbonaceous reducing agent and 2.2t of quartz stone are added into the converting furnace 40 minutes before the furnace screening period is ended, wherein the feeding rate of the carbonaceous reducing agent is 2.5t/h, the feeding rate of the quartz stone is 3.3t/h, and in the later stage of the furnace screening, the carbonaceous reducing agent is stopped to be added, only 0.2t of the quartz stone is added, and air is stopped to remove slag. The iron-silicon ratio in the sieve slag is 1.2, the content of iron tetroxide in the sieve slag is 22, the Ni content in the sieve slag is 1.1%, and the Co0.55% content in the sieve slag is obtained.
Example 2
After the converting furnace discharges the last pack of shallow blowing slag (the Fe content in the nickel matte is 12 percent at the moment), the converting furnace enters a furnace screening period, and the blast state in the converting furnace is maintained (the blast rate is 13000-15000 Nm)3The temperature is 1240 ℃, the CO content of the discharged flue gas is 0.6 percent, 1.5t of carbonaceous reducing agent and 2.8t of quartz stone are added into the converting furnace within 30 minutes during the furnace screening period, wherein the feeding rate of the carbonaceous reducing agent is 3t/h, and the feeding rate of the quartz stone is 5.6 t/h. Stopping adding carbon for reduction at the later stage of the screening furnaceAdding only 0.3t of quartz stone, and stopping wind to remove slag. The iron-silicon ratio in the sieve slag is 1.0, the content of iron tetroxide in the sieve slag is 13%, the content of Ni in the sieve slag is 1.0%, and the content of Co0.5% in the sieve slag.
Example 3
After the converting furnace discharges the last pack of shallow blowing slag (the Fe content in the nickel matte is 10 percent), the converting furnace enters a furnace screening period, and the blowing state in the converting furnace is maintained (the blowing rate is 28000-30000 Nm)3And/h, the temperature is 1250 ℃), the discharged flue gas contains 0.4% of CO, 3.2t of carbonaceous reducing agent and 6.2t of quartz stone are added into the converting furnace 30 minutes before the end of the furnace screening period, wherein the feeding rate of the carbonaceous reducing agent is 6t/h, the feeding rate of the quartz stone is 12t/h, the carbonaceous reducing agent is stopped to be added in the later stage of the furnace screening, only the quartz stone is added for 0.7t, and air is stopped to remove slag. The iron-silicon ratio in the sieve slag is 0.9, the content of iron tetroxide in the sieve slag is 11%, the Ni content in the sieve slag is 0.9%, and the Co0.4% content in the sieve slag is obtained.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A screen furnace process for converting nickel matte comprising:
adding the last pack of low-nickel matte into the converting furnace, discharging slag when the Fe content in the nickel matte is 10-15%, and continuing converting until the converting furnace enters a furnace screening period;
in the furnace screening period, maintaining the blast state and the reducing atmosphere in the converting furnace, continuously adding a carbonaceous reducing agent and quartz stones into the converting furnace through a quantitative feeder, and reducing metal oxides in the slag into high-nickel matte;
and (3) stopping adding the carbonaceous reducing agent, only adding quartz stone and stopping blowing to remove slag in the last 3-5 min of the furnace screening period so as to obtain high-nickel matte with required quality and screen furnace slag with lower Ni and Co contents.
2. The screen furnace method of claim 1, wherein the carbonaceous reducing agent is added during the screening period to form a specific reducing atmosphere in the slag phase to control the ratio of Co into the slag.
3. The screen furnace method of claim 1, wherein the carbonaceous reducing agent is added in an amount of 0.2 to 2.5t and the quartz stone is added in an amount of 0.2 to 4t during the screen furnace period.
4. The screen furnace method of claim 1, wherein the carbonaceous reducing agent is stopped and only 0.1 to 0.4t of the quartz stone is added in the last 3 to 5min of the screen furnace period.
5. The screen furnace method of claim 1, wherein the feeding rate of the carbonaceous reducing agent is 1 to 10 t/h.
6. The screen furnace method of claim 1 or 4, wherein the feeding rate of the quartz stone is 3-30 t/h.
7. The screen furnace method of claim 1, wherein the blowingMaintaining the blast rate of the converting furnace at 8000-30000 Nm after the converting furnace enters the screen furnace period3And h, the flue gas at the furnace mouth contains 0.1-1% of CO gas.
8. The method for screening the furnace of claim 1, wherein in the screening period, the rotation angle of the converter is 0-40 degrees in front of the furnace on the basis of a normal position.
9. The screen furnace method of claim 1, wherein the temperature in the converting furnace is maintained at 1220-1280 ℃ after the converting furnace enters the screen furnace period.
10. The screen furnace method of claim 1, wherein the molar ratio of iron to silicon in the screen slag is 0.8 to 1.2.
11. The screen furnace method of claim 1 or 5, wherein the content of ferroferric oxide in the screen furnace slag is 15-30 wt%.
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| CN202010700967.6A CN112030006B (en) | 2020-07-17 | 2020-07-17 | Furnace screening method suitable for nickel matte converting reduction furnace |
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| CN202010700967.6A CN112030006B (en) | 2020-07-17 | 2020-07-17 | Furnace screening method suitable for nickel matte converting reduction furnace |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2008167A1 (en) * | 1989-01-27 | 1990-07-27 | Pekka Hanniala | Method and apparatus for manufacturing high-grade nickel matte |
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| CN102703684A (en) * | 2012-06-18 | 2012-10-03 | 中国恩菲工程技术有限公司 | Method for producing low nickel matte through vulcanization of calcined sand |
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-
2020
- 2020-07-17 CN CN202010700967.6A patent/CN112030006B/en active Active
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| CA2008167A1 (en) * | 1989-01-27 | 1990-07-27 | Pekka Hanniala | Method and apparatus for manufacturing high-grade nickel matte |
| WO2009129653A1 (en) * | 2008-04-23 | 2009-10-29 | Dong Shutong | A comprehensive recovery and utilization process for laterite-nickel ore |
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| CN102703684A (en) * | 2012-06-18 | 2012-10-03 | 中国恩菲工程技术有限公司 | Method for producing low nickel matte through vulcanization of calcined sand |
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| CN107385233A (en) * | 2017-07-07 | 2017-11-24 | 金川集团股份有限公司 | A kind of method of the low nickel matte chlorination refining of high ferro |
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| Title |
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