CN113151691A - Bottom-top composite blowing smelting reduction furnace for treating molten copper slag - Google Patents
Bottom-top composite blowing smelting reduction furnace for treating molten copper slag Download PDFInfo
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- CN113151691A CN113151691A CN202110466489.1A CN202110466489A CN113151691A CN 113151691 A CN113151691 A CN 113151691A CN 202110466489 A CN202110466489 A CN 202110466489A CN 113151691 A CN113151691 A CN 113151691A
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast 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
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/0052—Reduction smelting or converting
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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
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0054—Slag, slime, speiss, or dross treating
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
Abstract
A bottom-top composite blowing smelting reduction furnace for treating molten copper slag comprises a cylinder body and end sockets at two ends; the charging opening is positioned at the top of one side, and the exhaust opening is positioned at the top of the other side; the iron tap hole is positioned at the bottom, and the slag discharging hole is positioned above the iron tap hole; the upper part of a seal head at one side of a charging opening of a molten copper slag inlet; the stirring paddle connected with the bottom of the stirring shaft of the stirring device is positioned below the axis of the horizontal furnace body; the top of the horizontal furnace body is provided with a plurality of top-blowing spray guns, and the bottom of the horizontal furnace body is provided with a plurality of bottom-blowing spray guns; the vortex area is horizontally spaced from the top-blowing spray gun and is positioned above the bottom-blowing spray gun. The device and the method can realize the continuous treatment of the copper slag and the efficient utilization of the waste heat, reduce the energy consumption, greatly reduce the labor intensity and fully utilize the system energy.
Description
Technical Field
The invention relates to the technical field of metallurgy and comprehensive utilization of copper slag, in particular to a bottom-top composite blowing smelting reduction furnace for treating molten copper slag.
Technical Field
Modern oxygen-enriched blowing enhances the smelting strength of copper and simultaneously brings about the sharp increase of the residual copper in smelting slag, so the modern copper smelting process carries out dilution and copper recovery treatment on the copper slag. Two types of industrial methods for diluting and recovering copper slag are available: slow cooling ore dressing and fire dilution smelting; but the recovery rate of copper at present does not reach the industrial requirement, and in principle, the beneficiation method can only recover most of the mixed matte, and the slag slow cooling beneficiation method is as follows: the slow cooling within the phase transition temperature (1080 ℃) can lead copper mineral particles to grow up, thereby ensuring the good trapping of copper in the flotation process, leading the copper content of the tailings obtained by the mineral separation to be below 0.35 percent and being controllable to be about 0.2 percent in a few enterprises at present. However, the iron-containing tailings of the ore dressing after the copper is recovered by the ore dressing cannot be utilized, and only can be stockpiled for treatment, so that great secondary pollution is caused. Theoretically, the smelting method by a fire method can reduce the copper content of the slag to a slag-matte balance level, the hot slag is directly subjected to electric-heating depletion, the copper-containing slag is placed into a depletion furnace for sedimentation and slag-matte separation and reduction, and the copper content of the slag is generally below 0.4-0.5%; but the vulcanizing agent in the pyrogenic process dilution process is seriously volatilized and seriously pollutes the environment, the vulcanizing agent floats on the surface of the molten slag and is difficult to be fully contacted with a molten slag pool, and the utilization rate of the vulcanizing agent is low. In the existing fire-method depletion process, the residual content of copper in the depleted slag is about 0.5 percent, and the recovery rate of copper is low.
For the development of a copper slag reduction device, domestic related scientific research personnel carry out a great deal of research work; for example, in the reduction furnace for processing cobalt-containing copper smelting slag disclosed by the Wen Yan Ru and the like, application number 201920404870.3, a charging area and a molten pool are formed in the furnace body of the reduction furnace from top to bottom, and a slag layer and a copper-cobalt matte layer are formed in the molten pool from top to bottom; the electrode extends into the slag layer from the top end of the furnace body; the drying device is provided with a reducing agent inlet, a vulcanizing agent inlet and a mixture outlet; the spray gun is obliquely arranged downwards, and the other end of the spray gun extends into the furnace body from the top end of the furnace body and extends to the slag layer; the flue gas treatment unit is connected with the flue gas outlet; the copper-cobalt-matte storage device is provided with a copper-cobalt-matte inlet and a copper-cobalt-matte particle outlet; the magnetic separation device is provided with a copper-cobalt matte particle inlet, a copper concentrate outlet and a cobalt concentrate outlet.
The patent refers to the field of 'treatment of copper slag by melting in gases'.
Although the scheme can reduce the copper slag, the reduction time is long, and the heat utilization rate is low.
Disclosure of Invention
The invention aims to provide a bottom-top composite blowing smelting reduction furnace for treating molten copper slag, which solves the problem of high-value utilization of the copper slag, particularly the problem of utilization of residual heat of the molten copper slag, and improves the reduction efficiency of the molten copper slag and the utilization rate of the residual heat of the copper slag.
The bottom-top composite blowing smelting reduction furnace for treating the molten copper slag comprises a horizontal furnace body, a molten copper slag inlet, a feeding port, an exhaust port, a slag discharge port, an iron discharge port, a stirring device, a plurality of top-blowing spray guns and a plurality of bottom-blowing spray guns, wherein the feeding port is connected with the bottom-blowing spray guns; the horizontal furnace body consists of a cylinder body which is horizontally placed and end sockets at two ends of the cylinder body; the charging port is positioned at the top of one side of the horizontal furnace body, and the exhaust port is positioned at the top of the other side of the horizontal furnace body; the slag discharge port and the iron discharge port are positioned on the seal head at one side of the exhaust port, wherein the iron discharge port is positioned at the bottom of the seal head, and the slag discharge port is positioned above the iron discharge port; the molten copper slag inlet is positioned at the upper part of the end enclosure at one side of the charging opening; a stirring shaft of the stirring device is inserted into the horizontal furnace body, a stirring paddle connected with the bottom of the stirring shaft is positioned below the axis of the horizontal furnace body, and the area where the stirring paddle is positioned is used as an eddy current area; the top of the horizontal furnace body is provided with a plurality of top-blowing spray guns; the bottom of the horizontal furnace body is provided with a plurality of bottom blowing spray guns; the vortex area is horizontally spaced from the top-blowing spray gun and is positioned above the bottom-blowing spray gun.
In the above-mentioned reduction furnace, the top-blowing lances are arranged along a bus direction of the horizontally disposed cylindrical body, and the bottom-blowing lances are arranged along the bus direction of the horizontally disposed cylindrical body.
In the reduction furnace, the iron discharging port is a siphon type iron discharging port.
The use method of the bottom-top composite blowing smelting reduction furnace for treating the molten copper slag comprises the following steps:
1. continuously introducing molten copper slag into the horizontal furnace body through the molten copper slag inlet to form a molten pool in the horizontal furnace body; when the liquid level of the molten pool is higher than the stirring paddle, starting the stirring device to enable the vortex area where the stirring device is located to form a vortex;
2. continuously adding a slagging agent into the horizontal furnace body through a feed inlet; continuously adding a solid reducing agent into the horizontal furnace body through a charging opening, or blowing a gaseous reducing agent into the horizontal furnace body through a bottom blowing spray gun; carrying out a smelting reduction reaction on the molten slag and a solid reducing agent or a gas reducing agent, and generating molten slag and copper-containing molten iron under the action of a slag former so that a molten pool forms an upper molten slag layer and a lower copper-containing molten iron layer;
3. gas and oxygen-enriched air are blown into the horizontal furnace body through the top-blowing spray gun, the gas and the oxygen-enriched air are subjected to oxidation reaction in the horizontal furnace body to release heat, and a molten pool is heated and controlled in temperature; CO generated by the melting reduction reaction is combusted by fuel gas and oxygen-enriched air; the flue gas generated in the horizontal furnace body is exhausted from an exhaust port;
4. when the liquid level of the molten pool reaches a slag discharge port, slag is continuously discharged through overflow slag discharge; and discharging the copper-containing molten iron through an iron discharging port.
The iron grade TFe of the molten copper slag is 35-45%, and the content of Au is 0.5%About 1.5g/t, which comprises 30 to 43 percent of FeO, 0.5 to 5 percent of Cu, 5 to 6 percent of Zn, 1 to 2 percent of S and Al according to mass percentage2O3 3～4％，CaO 0.5～1.2％，MgO 0.5～1.3％，SiO 2 14～22％，As 0.04～0.08％。
The solid reducing agent is coke, coke or cathode carbon block, and the mass content of the fixed carbon in the reducing agent is more than or equal to 50 percent.
The gaseous reducing agent is natural gas or hydrogen.
In the step 2, the reducing agent is added in an amount which is 1-1.5 times of the total amount required for completing the reduction reaction; the reaction formula of the reduction reaction is FeO + C ═ Fe + CO ═ ≠ C.
In the step 2, the slag former is CaO or CaF2And/or carbide slag, the dosage of the slag former according to the binary alkalinity (CaO/SiO) of the generated slag2) Is added in the amount of 1.0-1.4.
In the step 3, the molten pool is heated and controlled to 1450-1500 ℃.
In the method, the average residence time of the molten copper slag in the horizontal furnace body is 45-60 min.
In the method, the exhaust port is communicated with the flue gas boiler through a pipeline and is used for recovering the heat of the flue gas.
In the method, the reduction rate of iron is more than or equal to 98 percent, the reduction rate of copper is more than or equal to 97 percent, and the copper-containing molten iron contains 0.8-0.9 percent of Cul by mass percent.
In the method, the stirring speed of the stirring device is 50-300 rpm.
The principle and advantages of the device and the method of the invention are as follows:
1. the bottom-top composite blowing smelting reduction furnace can realize direct continuous smelting reduction of molten copper slag, can realize continuous treatment of copper slag and efficient utilization of waste heat, and reduces energy consumption;
2. molten copper slag is continuously added from a copper slag adding port, a slag former and a solid reducing agent are added by adopting vortex, and copper-containing molten iron is reduced, siphoning tapping and overflow deslagging are performed, so that the continuous operation of the melting reduction process is realized, and the labor intensity is greatly reduced;
3. the vortex feeding and the mechanical and bottom blowing gas coupling vortex stirring greatly enhance the melting reduction efficiency and improve the reduction rate of valuable components such as copper, iron and the like;
4. the top-blown oxygen-enriched air and fuel are adopted, and CO generated by melting reduction is fully combusted, so that heat supplement to a molten pool is realized, the heat balance of the system is stabilized, and the energy of the system is fully utilized.
Drawings
FIG. 1 is a schematic structural view of a bottom-top composite injection smelting reduction furnace for treating molten copper slag according to an embodiment of the present invention;
in the figure, 1, a molten copper slag inlet, 2, a charging port, 3, a stirring device, 4, a first top-blowing spray gun, 5, a second top-blowing spray gun, 6, a third top-blowing spray gun, 7, a fourth top-blowing spray gun, 8, a fifth top-blowing spray gun, 9, an exhaust port, 10, a slag discharge port, 11, an iron discharge port, 12, a fifth bottom-blowing spray gun, 13, a fourth bottom-blowing spray gun, 14, a third bottom-blowing spray gun, 15, a second bottom-blowing spray gun and 16, the first bottom-blowing spray gun.
Detailed Description
In the embodiment of the invention, the iron grade TFe of the molten copper slag is 42.47 percent, the content of Au is 1.2g/t, and the content of FeO43.14 percent, Cu 4.51 percent, Zn 5.67 percent, S1.55 percent and Al in percentage by mass2O3 3.02％，CaO 0.96％，MgO 1.09％，SiO2 20.82％，As 0.075％。
In the embodiment of the invention, when the slagging constituent is calcium fluoride or carbide slag, calcium in the slagging constituent reacts to generate calcium oxide in the slag.
In the embodiment of the invention, the stirring speed of the stirring device is 50-300 rpm.
In the embodiment of the invention, the solid reducing agent is coke coal, coke or cathode carbon block, and the mass content of the fixed carbon in the reducing agent is more than or equal to 50%.
In an embodiment of the invention, the gaseous reducing agent is natural gas or hydrogen.
In the embodiment of the invention, the slag former is CaO and CaF2And/or the carbide slag,
in the embodiment of the invention, the reduction rate of iron is more than or equal to 98 percent, and the reduction rate of copper is more than or equal to 97 percent.
The following are preferred embodiments of the present invention.
Example 1
The structure of the bottom-top composite blowing smelting reduction furnace for treating molten copper slag is shown in figure 1, and comprises a horizontal furnace body, a molten copper slag inlet 1, a charging opening 2, an exhaust opening 9, a slag discharge opening 10, an iron discharge opening 11, a stirring device 3, a first top-blowing spray gun 4, a second top-blowing spray gun 5, a third top-blowing spray gun 6, a fourth top-blowing spray gun 7, a fifth top-blowing spray gun 8, a first bottom-blowing spray gun 16, a second bottom-blowing spray gun 15, a third bottom-blowing spray gun 14, a fourth bottom-blowing spray gun 13 and a fifth bottom-blowing spray gun 12;
the horizontal furnace body consists of a cylinder body which is horizontally placed and end sockets at two ends of the cylinder body;
the feed inlet 2 is positioned at the top of one side of the horizontal furnace body, and the exhaust port 9 is positioned at the top of the other side of the horizontal furnace body; the slag discharge hole 10 and the iron discharge hole 11 are positioned on the seal head at one side of the exhaust port 9, wherein the iron discharge hole 11 is positioned at the bottom of the seal head, and the slag discharge hole 10 is positioned above the iron discharge hole;
the molten copper slag inlet 1 is positioned at the upper part of the end enclosure at one side of the charging opening 2;
a stirring shaft of the stirring device 3 is inserted into the horizontal furnace body, a stirring paddle connected with the bottom of the stirring shaft is positioned below the axis of the horizontal furnace body, and the area where the stirring paddle is positioned is used as an eddy current area;
the top of the horizontal furnace body is provided with a first top-blowing spray gun 4, a second top-blowing spray gun 5, a third top-blowing spray gun 6, a fourth top-blowing spray gun 7 and a fifth top-blowing spray gun 8, and all the top-blowing spray guns are arranged along the bus direction of the horizontally placed cylinder body;
a first bottom-blowing spray gun 16, a second bottom-blowing spray gun 15, a third bottom-blowing spray gun 14, a fourth bottom-blowing spray gun 13 and a fifth bottom-blowing spray gun 12 are arranged at the bottom of the horizontal furnace body, and all the bottom-blowing spray guns are arranged along the bus direction of the horizontally placed cylinder body;
the vortex area is horizontally spaced from each top-blowing spray gun and is positioned above each bottom-blowing spray gun;
the iron discharging port is a siphon type iron discharging port; the exhaust port is communicated with the flue gas boiler through a pipeline and is used for recovering the heat of the flue gas;
the method comprises the following steps:
continuously introducing molten copper slag into the horizontal furnace body through the molten copper slag inlet to form a molten pool in the horizontal furnace body; when the liquid level of the molten pool is higher than the stirring paddle, starting the stirring device to enable the vortex area where the stirring device is located to form a vortex;
continuously adding a slagging agent into the horizontal furnace body through a feed inlet; continuously adding a solid reducing agent into the horizontal furnace body through a feed inlet; carrying out a smelting reduction reaction on the molten slag and a solid reducing agent or a gas reducing agent, and generating molten slag and copper-containing molten iron under the action of a slag former so that a molten pool forms an upper molten slag layer and a lower copper-containing molten iron layer; the amount of the slag former is determined according to the binary alkalinity (CaO/SiO) of the generated slag2) Is added at 1.0; the dosage of the reducing agent is added according to 1.1 times of the total amount required for completing the reduction reaction;
gas and oxygen-enriched air are blown into the horizontal furnace body through the top-blowing spray gun, the gas and the oxygen-enriched air are subjected to oxidation reaction in the horizontal furnace body to release heat, and a molten pool is heated and controlled in temperature; CO generated by the melting reduction reaction is combusted by fuel gas and oxygen-enriched air; the flue gas generated in the horizontal furnace body is exhausted from an exhaust port; heating the molten pool to control the temperature to 1450; the average residence time of the molten copper slag in the horizontal furnace body is 60 min;
when the liquid level of the molten pool reaches a slag discharge port, slag is continuously discharged through overflow slag discharge; discharging the copper-containing molten iron through an iron discharging port; the copper-containing molten iron contains 0.89 percent of Cu by mass percent.
Example 2
The structure of the bottom-top composite blowing smelting reduction furnace for treating the molten copper slag is the same as that of the embodiment 1;
the method is the same as example 1, except that:
(1) blowing a gas reducing agent into the horizontal furnace body through a bottom blowing spray gun;
(2) the amount of the slag former is determined according to the binary alkalinity (CaO/SiO) of the generated slag2) Is added in 1.2 percent; the dosage of the reducing agent is added according to 1.3 times of the total amount required for completing the reduction reaction;
(3) heating the molten pool and controlling the temperature to 1500 ℃; the average residence time of the molten copper slag in the horizontal furnace body is 45 min;
(4) the copper-containing molten iron contains 0.84 percent of Cu by mass percent.
Example 3
The structure of the bottom-top composite blowing smelting reduction furnace for treating the molten copper slag is the same as that of the embodiment 1;
the method is the same as example 1, except that:
(1) blowing a gas reducing agent into the horizontal furnace body through a bottom blowing spray gun;
(2) the amount of the slag former is determined according to the binary alkalinity (CaO/SiO) of the generated slag2) Is added for 1.4; the dosage of the reducing agent is added according to 1.5 times of the total amount required for completing the reduction reaction;
(3) heating the molten pool and controlling the temperature to 1480 ℃; the average residence time of the molten copper slag in the horizontal furnace body is 50 min;
(4) the copper-containing molten iron contains 0.81 percent of Cu by mass percent.
Claims (5)
1. A bottom-top composite blowing smelting reduction furnace for treating molten copper slag is characterized by comprising a horizontal furnace body, a molten copper slag inlet, a feeding port, an exhaust port, a slag discharge port, an iron discharge port, a stirring device, a plurality of top-blowing spray guns and a plurality of bottom-blowing spray guns; the horizontal furnace body consists of a cylinder body which is horizontally placed and end sockets at two ends of the cylinder body; the charging port is positioned at the top of one side of the horizontal furnace body, and the exhaust port is positioned at the top of the other side of the horizontal furnace body; the slag discharge port and the iron discharge port are positioned on the seal head at one side of the exhaust port, wherein the iron discharge port is positioned at the bottom of the seal head, and the slag discharge port is positioned above the iron discharge port; the molten copper slag inlet is positioned at the upper part of the end enclosure at one side of the charging opening; a stirring shaft of the stirring device is inserted into the horizontal furnace body, a stirring paddle connected with the bottom of the stirring shaft is positioned below the axis of the horizontal furnace body, and the area where the stirring paddle is positioned is used as an eddy current area; the top of the horizontal furnace body is provided with a plurality of top-blowing spray guns; the bottom of the horizontal furnace body is provided with a plurality of bottom blowing spray guns; the vortex area is horizontally spaced from the top-blowing spray gun and is positioned above the bottom-blowing spray gun.
2. The bottom-top complex injection smelting reduction furnace according to claim 1, wherein the top-blowing lances are arranged along a generatrix direction of the horizontally disposed cylindrical body, and the bottom-blowing lances are arranged along the generatrix direction of the horizontally disposed cylindrical body.
3. A use method of a bottom-top composite blowing smelting reduction furnace for treating molten copper slag is characterized by comprising the following steps:
(1) continuously introducing molten copper slag into the horizontal furnace body through the molten copper slag inlet to form a molten pool in the horizontal furnace body; when the liquid level of the molten pool is higher than the stirring paddle, starting the stirring device to enable the vortex area where the stirring device is located to form a vortex;
(2) continuously adding a slagging agent into the horizontal furnace body through a feed inlet; continuously adding a solid reducing agent into the horizontal furnace body through a charging opening, or blowing a gaseous reducing agent into the horizontal furnace body through a bottom blowing spray gun; carrying out a smelting reduction reaction on the molten slag and a solid reducing agent or a gas reducing agent, and generating molten slag and copper-containing molten iron under the action of a slag former so that a molten pool forms an upper molten slag layer and a lower copper-containing molten iron layer;
(3) gas and oxygen-enriched air are blown into the horizontal furnace body through the top-blowing spray gun, the gas and the oxygen-enriched air are subjected to oxidation reaction in the horizontal furnace body to release heat, and a molten pool is heated and controlled in temperature; CO generated by the melting reduction reaction is combusted by fuel gas and oxygen-enriched air; the flue gas generated in the horizontal furnace body is exhausted from an exhaust port;
(4) when the liquid level of the molten pool reaches a slag discharge port, slag is continuously discharged through overflow slag discharge; and discharging the copper-containing molten iron through an iron discharging port.
4. The use method of the bottom-top composite blowing smelting reduction furnace for treating molten copper slag according to claim 3, characterized in that in the step (3), the temperature of the molten pool is controlled to 1450-1500 ℃.
5. The use method of the bottom-top composite blowing smelting reduction furnace for treating molten copper slag according to claim 3, characterized in that the reduction rate of iron is not less than 98%, the reduction rate of copper is not less than 97%, and the copper-containing molten iron contains 0.8-0.9% by mass of Cu.
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| CN202110466489.1A CN113151691A (en) | 2021-04-28 | 2021-04-28 | Bottom-top composite blowing smelting reduction furnace for treating molten copper slag |
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| CN202110466489.1A CN113151691A (en) | 2021-04-28 | 2021-04-28 | Bottom-top composite blowing smelting reduction furnace for treating molten copper slag |
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| CN101705360A (en) * | 2009-11-26 | 2010-05-12 | 阳谷祥光铜业有限公司 | Copper-smelting thermal slag iron-extracting process and device |
| CN104846209A (en) * | 2015-05-29 | 2015-08-19 | 东北大学 | System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification |
| CN105671326A (en) * | 2016-03-15 | 2016-06-15 | 东北大学 | Stirring synergy method for diluting copper slag with injection gas carrying vulcanizing agent |
| CN105779778A (en) * | 2016-03-15 | 2016-07-20 | 东北大学 | Dilution method for copper smelting slag |
| CN109929957A (en) * | 2019-03-28 | 2019-06-25 | 东北大学 | A kind of device and method of pre-reduced iron ore high melt production molten iron |
| CN111394534A (en) * | 2020-02-21 | 2020-07-10 | 东北大学 | Method for continuous smelting reduction iron making |
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2021
- 2021-04-28 CN CN202110466489.1A patent/CN113151691A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705360A (en) * | 2009-11-26 | 2010-05-12 | 阳谷祥光铜业有限公司 | Copper-smelting thermal slag iron-extracting process and device |
| CN104846209A (en) * | 2015-05-29 | 2015-08-19 | 东北大学 | System and method for recovering iron and waste heat from molten copper residues respectively through step-by-step reduction and coal gasification |
| CN105671326A (en) * | 2016-03-15 | 2016-06-15 | 东北大学 | Stirring synergy method for diluting copper slag with injection gas carrying vulcanizing agent |
| CN105779778A (en) * | 2016-03-15 | 2016-07-20 | 东北大学 | Dilution method for copper smelting slag |
| CN109929957A (en) * | 2019-03-28 | 2019-06-25 | 东北大学 | A kind of device and method of pre-reduced iron ore high melt production molten iron |
| CN111394534A (en) * | 2020-02-21 | 2020-07-10 | 东北大学 | Method for continuous smelting reduction iron making |
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