CN111893317A - High-aluminum slag system for nickel flash furnace smelting and application thereof - Google Patents
High-aluminum slag system for nickel flash furnace smelting and application thereof Download PDFInfo
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- CN111893317A CN111893317A CN202010880913.2A CN202010880913A CN111893317A CN 111893317 A CN111893317 A CN 111893317A CN 202010880913 A CN202010880913 A CN 202010880913A CN 111893317 A CN111893317 A CN 111893317A
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- C22B23/02—Obtaining nickel or cobalt by dry processes
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Abstract
The invention belongs to the technical field of nickel flash furnace smelting, and discloses a high-aluminum slag system for nickel flash furnace smelting and application thereof, wherein the high-aluminum slag system comprises the following components in percentage by mass: fe 45-52%, MgO 6.5-12%, SiO218％‑24％、CaO 0.2％‑2.0％、Al2O39.5 to 15.5 percent of MnO and 1.5 to 5.5 percent of MnO. The high-aluminum slag system provided by the invention can ensure smooth smelting of the nickel flash furnace, and can reduce the melting temperature of the slag and maintain good viscous flow property and slag-matte separation capability of the slag.
Description
Technical Field
The invention belongs to the technical field of nickel flash furnace smelting, and mainly relates to a high-aluminum slag system for nickel flash furnace smelting and application thereof.
Background
The suitable smelting slag system is one of the basic conditions for realizing the stable and smooth smelting furnace condition of the nickel flash furnace. An important raw material for nickel flash furnace smelting is nickel sulfide ore, but in recent years, along with the gradual consumption of high-grade nickel sulfide ore with high nickel content and low impurity content, nickel ore with high magnesium content gradually becomes a possible nickel smelting raw material. The high content of magnesium oxide causes changes in the melting point and viscosity of the slag, which deviates the smelting process of the nickel flash furnace from its normal optimal control point. Currently, the MgO content of flash furnaces used by enterprises for smelting nickel ores is as high as about 6% -10%. In order to ensure a reasonable smelting viscosity range, the smelting temperature needs to be increased significantly every time MgO in the nickel ore is increased a little, which can lead to the increase of smelting energy consumption. In the actual production, the smelting slag of the high-magnesium nickel sulfide flash furnace generated by smelting the high-magnesium nickel sulfide ore has the melting temperature of over 1250 ℃, and SiO is selectively added in the current production process for reducing the melting temperature2To lower the melting temperature and ensure the fluidity of the slag. However, this strategy results in a significant increase in the amount of slag, up to 6 tons per 1 ton of nickel produced, and the iron is present in the form of iron silicate, making subsequent reduction and utilization difficult. Therefore, how to improve the metallurgical property of the nickel flash furnace smelting slag becomes the key point of reducing energy consumption and saving cost in production.
Disclosure of Invention
In order to solve the problems in the existing smelting process, the invention aims to provide a high-aluminum slag system for nickel flash smelting and application thereof, so as to improve the viscous flow characteristic of slag, reduce the smelting temperature and reduce the energy consumption in the nickel flash smelting process.
The purpose of the invention is realized by the following technical scheme:
a high-aluminum slag system for nickel flash furnace smelting comprises the following components in percentage by mass:
Fe 52％-61.1％、MgO 6.5％-12％、SiO218％-21.5％、CaO 1.20％、Al2O39.5％-15.5％、MnO 0.2％。
preferably, MgO and SiO2In a mass ratio of 0.27-0.67, Al2O3And SiO2The mass ratio of (A) to (B) is 0.39-0.86.
Preferably, when the mass content of MgO in the high-alumina slag system for nickel flash furnace smelting is 6.5-8%, MgO and SiO2In a mass ratio of 0.27-0.35, Al2O3And SiO2The mass ratio of (A) to (B) is 0.40-0.63.
Preferably, when the mass content of MgO in the high-alumina slag system for nickel flash furnace smelting is 8-10%, MgO and SiO2In a mass ratio of 0.35-0.55, Al2O3And SiO2The mass ratio of (A) is 0.63-0.72.
Preferably, when the mass content of MgO in the high-alumina slag system for nickel flash furnace smelting is 10-12%, MgO and SiO2In a mass ratio of 0.55-0.67, Al2O3And SiO2The mass ratio of (A) is 0.72-0.86.
The invention also relates to the application of the high-alumina slag system, which is used for the flash furnace smelting process of nickel sulfide ores.
Compared with the prior art, the invention has the following beneficial effects:
the mass percentage of MgO in the high-aluminum slag system for nickel flash furnace smelting is 6.5-12%, and the SiO content in the high-aluminum slag system2The mass percentage of the slag is 18-21.5%, and the melting temperature of the slag can be reduced under the mixture ratio, and simultaneously, the good viscous flow property and slag matte separation capability of the slag are maintained. The invention uses Al2O3The extra quartz sand is replaced, so that 1t of nickel can be produced every time, and the slag amount can be controlled within 5.6 t; simultaneously reduces SiO in slag2The proportion of the slag to MgO and FeO to produce high-melting-point fayalite and fayalite reduces the melting temperature of the slag. Al in slag system2O3Under the condition that the mass percent is 9.5-15.5%, in order to control the interfacial tension and keep good slag and matte separation effect, a proper amount of MnO (accounting for Al) is added2O39.6 wt% -57 wt%); in addition, MgO, FeO and CaO in the slag system provide a large amount of free oxygen ions, blocking the oxygen ions due to Al3+Increase of silicon and aluminum ionsThe network structure reduces the viscosity of the slag.
Drawings
FIG. 1 is a graph of viscosity vs. Al2O3And SiO2The mass ratio of (a).
FIG. 2 shows melting temperature and Al2O3And SiO2The mass ratio of (a).
Detailed Description
In order that the present invention may be more clearly understood, the following detailed description of the present invention is given with reference to specific examples.
The invention relates to a high-aluminum slag system for nickel flash smelting, which comprises the following components in percentage by mass: fe 52-61.1%, MgO 6.5-12%, SiO218％-21.5％、CaO 1.20％、Al2O39.5％-15.5％、MnO0.2％。
The nickel flash furnace smelting process is a flash furnace smelting process of nickel sulfide ore, wherein MgO/SiO20.27-0.67 of Al2O3/SiO2Is 0.39-0.86.
When MgO accounts for 6.5 to 8 percent in the high-alumina slag system smelted by the nickel flash furnace, MgO/SiO20.27-0.35 of Al2O3/SiO2Is 0.40-0.63.
When 8-10% of MgO is contained in the high-alumina slag system smelted by the nickel flash furnace, MgO/SiO is added20.35-0.55 of Al2O3/SiO2Is 0.63-0.72.
When MgO accounts for 10 to 12 percent in the high-alumina slag system smelted by the nickel flash furnace, MgO/SiO20.55-0.67 of Al2O3/SiO2Is 0.72-0.86.
Examples
The table 1 shows the main components of the nickel flash furnace smelting slag system, wherein the sample No. 1 in the table is the existing nickel flash furnace smelting slag system composition, and the samples No. 2 to 4 are the high-alumina slag system compositions of the embodiments 1 to 3 of the invention respectively.
TABLE 1
The slag system in table 1 was tested for viscosity-melting temperature using a Brookfield DV-II + high temperature melt property tester and a rotational method using a chemically pure reagent according to table 1, and the results are shown in fig. 1 and 2. During the viscosity measurement, about 150g of sample was placed in a Pt crucible. The sample was heated to 1500 ℃ at a rate of 5 ℃/min and kept at a temperature of about 240min for adequate reaction. The main shaft is slowly injected into the fluid slag at a low rotational speed. The sample was then slowly cooled to 1100 ℃ and each measurement was performed after the sample was held at a certain temperature for 10min to ensure that the sample was uniform and stable. The viscosity values were calculated and recorded by software on a computer.
As can be seen from fig. 1 and 2, as the composition of the experimental group slag changes toward the composition of the slag system provided by the present invention, the melting temperature of the slag gradually decreases from 1256 ℃ to 1127 ℃, and the viscosity at high temperature is kept below 0.25Pa · S. The slag system provided by the invention can ensure smooth smelting in the kneading flash furnace, and can reduce the melting temperature of the slag and maintain good viscous flow property and slag matte separation capability of the slag.
Claims (6)
1. A high-aluminum slag system for nickel flash smelting is characterized by comprising the following components in percentage by mass:
Fe52％-61.1％、MgO 6.5％-12％、SiO218％-21.5％、CaO 1.20％、Al2O39.5％-15.5％、MnO 0.2％。
2. the high alumina slag system for nickel flash smelting according to claim 1, wherein MgO and SiO2In a mass ratio of 0.27-0.67, Al2O3And SiO2The mass ratio of (A) to (B) is 0.39-0.86.
3. The high-alumina slag system for nickel flash smelting according to claim 1, wherein the high-alumina slag system for nickel flash smelting contains MgO in qualityMgO and SiO in an amount of 6.5-8%2In a mass ratio of 0.27-0.35, Al2O3And SiO2The mass ratio of (A) to (B) is 0.40-0.63.
4. The high-alumina slag system for nickel flash smelting according to claim 1, wherein when the MgO mass content in the high-alumina slag system for nickel flash smelting is 8-10%, MgO and SiO are added2In a mass ratio of 0.35-0.55, Al2O3And SiO2The mass ratio of (A) is 0.63-0.72.
5. The high-alumina slag system for nickel flash smelting according to claim 1, wherein when the MgO mass content in the high-alumina slag system for nickel flash smelting is 10-12%, MgO and SiO are added2In a mass ratio of 0.55-0.67, Al2O3And SiO2The mass ratio of (A) is 0.72-0.86.
6. Use of a high alumina slag train for nickel flash furnace smelting according to any one of claims 1 to 5, characterized in that the high alumina slag train for nickel flash furnace smelting is used in flash furnace smelting processes for sulphidic nickel ores.
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Citations (6)
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|---|---|---|---|---|
| US4818289A (en) * | 1984-12-21 | 1989-04-04 | Outokumpu Oy | Method for utilizing slag from metal production |
| US5593493A (en) * | 1995-06-26 | 1997-01-14 | Krofchak; David | Method of making concrete from base metal smelter slag |
| CN104152714A (en) * | 2014-08-01 | 2014-11-19 | 西安建筑科技大学 | Method for smelting nickel-copper from sulfide ores by virtue of pyrogenic process and extracting iron |
| CN106834729A (en) * | 2016-12-05 | 2017-06-13 | 重庆材料研究院有限公司 | A kind of nickel base superalloy electroslag remelting slag |
| CN207877601U (en) * | 2017-12-12 | 2018-09-18 | 江苏省冶金设计院有限公司 | A kind of system that melting nickel slag prepares forsterite |
| CN109439893A (en) * | 2018-11-20 | 2019-03-08 | 广东广青金属科技有限公司 | Stainless steel slag blast furnace sinter method |
-
2020
- 2020-08-27 CN CN202010880913.2A patent/CN111893317B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818289A (en) * | 1984-12-21 | 1989-04-04 | Outokumpu Oy | Method for utilizing slag from metal production |
| US5593493A (en) * | 1995-06-26 | 1997-01-14 | Krofchak; David | Method of making concrete from base metal smelter slag |
| CN104152714A (en) * | 2014-08-01 | 2014-11-19 | 西安建筑科技大学 | Method for smelting nickel-copper from sulfide ores by virtue of pyrogenic process and extracting iron |
| CN106834729A (en) * | 2016-12-05 | 2017-06-13 | 重庆材料研究院有限公司 | A kind of nickel base superalloy electroslag remelting slag |
| CN207877601U (en) * | 2017-12-12 | 2018-09-18 | 江苏省冶金设计院有限公司 | A kind of system that melting nickel slag prepares forsterite |
| CN109439893A (en) * | 2018-11-20 | 2019-03-08 | 广东广青金属科技有限公司 | Stainless steel slag blast furnace sinter method |
Non-Patent Citations (1)
| Title |
|---|
| 盛广宏等: "《镍工业冶金渣的资源化》", 《金属矿山》 * |
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