CN114292971B - Steel slag treatment method - Google Patents
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- CN114292971B CN114292971B CN202210014643.6A CN202210014643A CN114292971B CN 114292971 B CN114292971 B CN 114292971B CN 202210014643 A CN202210014643 A CN 202210014643A CN 114292971 B CN114292971 B CN 114292971B
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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
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a steel slag treatment method, which comprises the following steps: step A: adding powder: in a container for containing steel slag, firstly laying 35-55% of medium carbon powder tail mud, laying 5-10% of stone powder on the second layer, and then adding 35-55% of materials which are difficult to reduce and contain iron; and B: stirring and cooling: adding liquid steel slag into a container, wherein the liquid steel slag and the powder form a mixture, and stirring the mixture formed by the liquid steel slag and the powder by using a high-temperature-resistant stirring device, wherein the overall temperature of the mixture is reduced from 1500 ℃ to below 500 ℃; and C: transferring and slow cooling: and (C) in order to ensure the capability of treating the steel slag, the mixture with the temperature of below 500 ℃ obtained in the step (B) is moved to another high-temperature-resistant storage yard, and the steel slag is slowly cooled to below 60 ℃ so as to be discharged. The invention provides good conditions for subsequent secondary treatment and tailings resource utilization, and has the advantages of safe process, simple operation and low cost.
Description
Technical Field
The invention relates to the field of steel-making slag treatment, in particular to a novel steel slag treatment method, and particularly relates to a method for carrying out primary treatment on high-temperature liquid steel slag by using powder which needs reduction and magnetizing roasting at normal temperature.
Background
China is a high-yield steel country, and the yield of crude steel currently exceeds 10 hundred million tons per year. The steel slag is a byproduct generated in the steel-making process, and the yield of the steel slag accounts for 10-15% of the crude steel according to the existing steel-making technology level. That is, currently, in China, more than 1 million tons of steel slag are generated every year. The biggest problem faced by people is that the comprehensive utilization rate of the steel slag is low, which is only about 30 percent, and a large gap still exists between the steel slag and developed countries. If the steel slag is not reasonably utilized, the steel slag occupies a large amount of land resources and causes serious pollution to the environment.
The steel slag treatment can be roughly divided into three steps, wherein the first step is stabilization treatment, so that the stabilization of the steel slag can be also called primary treatment, namely, the steel slag in a hot state or a molten state is treated into normal-temperature lump slag through various cooling processes, so that the subsequent treatment of the steel slag is facilitated. At present, the main processes for treating the steel slag at home and abroad comprise a hot splashing method, a hot stuffiness method, an air quenching method, a roller method, a granulation wheel method and the like, wherein the hot splashing method, the roller method and the hot stuffiness method are most commonly used; the second step is screening and metal recovery treatment, also called secondary treatment, namely crushing, grading and recovering metal iron of the steel slag, and the second step is used for realizing high-efficiency slag iron separation and returning the iron-enriched material to smelting production so as to reduce the production cost; and the third step is the resource utilization and direct productization of the tailings, such as the application in the fields of backfill, agriculture and building materials.
At present, the existing steel slag one-step treatment technology has a plurality of defects, such as a hot splashing method, a water quenching method and an air quenching method, which have extensive treatment modes, and inorganized emission of a large amount of dust-containing steam, and cause serious pollution to the environment; the normal-pressure pool type thermal disintegration-CaO has long reaction time and low efficiency, and the sensible heat of the steel slag is not recovered; the drum method and the pressure hot-pressing method have the defects of large equipment investment, low iron recovery rate and the like.
In summary, the following problems exist in the prior art: the one-step treatment technology of the steel slag has poor utilization and recovery effects of the steel slag.
Disclosure of Invention
The invention provides a novel steel slag treatment method, which is used for increasing the content of magnetic substances in steel slag, reducing RO phase and improving the grindability of the steel slag.
Therefore, the invention provides a novel steel slag treatment method, which comprises the following steps:
step A: adding powder: in a container for containing steel slag, firstly laying 35-55% of medium carbon powder tail mud at the bottom, laying 5-10% of stone powder on the second layer, and then adding 35-55% of materials which are difficult to reduce and contain iron;
and B: stirring and cooling: adding liquid steel slag into a container, wherein the liquid steel slag and the powder form a mixture, and stirring the mixture formed by the liquid steel slag and the powder by using a high-temperature-resistant stirring device, wherein the overall temperature of the mixture is reduced from 1500 ℃ to below 500 ℃;
step C: transferring and slow cooling: and (C) in order to ensure the capability of treating the steel slag, the mixture with the temperature of below 500 ℃ obtained in the step (B) is moved to another high-temperature-resistant storage yard, and the steel slag is slowly cooled to below 60 ℃ so as to be discharged.
Further, the medium carbon powder tail mud contains about 20% of fixed carbon and about 38% of total iron, the particle size is about 0.1mm, and the water content is 15% -20%; the stone powder is natural stone powder, and the main component is hydrous calcium carbonate CaCO 3 The content is not less than 90 percent, and the grain diameter is between 0.1mm and 0.3 mm; the iron grade of the iron-containing material difficult to reduce is between 35 and 47 percent, the content of silicon dioxide is between 20 and 25 percent, and the grain diameter of the iron-containing material in a tank is controlled to be less than 0.5 mm.
Further, the liquid steel slag is added at a temperature of 1300-1700 ℃ and has a chemical composition of 40-55% by weight of CaO, 10-20% by weight of SiO 2 、15％～30％Fe 2 O 3 、5％～15％FeO、3％～5％MgO、2％～8％Al 2 O 3 。
Further, the main phase of the added liquid steel slag is 30-60 percent 2 S、5％～20％C 3 S, 15 to 25% of RO phase, 2 to 10% of f-CaO.
In this application, high temperature resistant agitating unit includes:
a base 8;
a lifting motor 7 arranged on the base 8;
the lifting arm 6 is vertically arranged on the base 8 in a lifting way and is connected with the lifting motor 7;
the cross arm 4 is arranged along the horizontal direction and is connected to the lifting arm 6;
the stirring motor 5 is arranged on the cross arm 4;
the stirring shaft 3 is vertically arranged and connected below the cross arm 4;
and the stirring blade 2 is connected below the stirring shaft 3.
Further, the high temperature resistant stirring device comprises: and a moving wheel 9 arranged at the bottom of the base 8.
Furthermore, the mass ratio of the added powder to the added liquid steel slag is less than or equal to 1.
Further, the container for containing the steel slag is a steel slag tank or a refractory pool.
Further, the mass ratio of the added powder to the added liquid steel slag is equal to 1.
Furthermore, the temperature of the steel slag before transfer is controlled between 400 ℃ and 450 ℃, and more sensible heat is utilized.
The invention utilizes the sensible heat of the steel slag, and the iron content of the tailings is less, thereby being beneficial to subsequent application, such as the production of cement. The invention achieves the sintering effect, can save the sintering production or working procedure, provides good conditions for subsequent secondary treatment and tailing resource utilization, has safe process, simple operation, low cost, better economic value and environmental protection value, and can realize the synergistic treatment of solid wastes.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The reference numbers illustrate:
1. a steel slag tank; 2. a stirring blade; 3. a stirring shaft; 4. a cross arm; 5. a stirring motor; 6. a lifting arm; 7. a lifting motor; 8. a base; 9. the wheel is moved.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
The invention relates to a method for carrying out primary treatment on high-temperature liquid steel slag by using powder which needs reduction and magnetization roasting at normal temperature, which is used for increasing the content of magnetic substances in the steel slag, reducing RO (a wide solid solution formed by FeO, mgO and other divalent metal oxides such as MnO) and improving the grindability of the steel slag.
The invention principle of the invention is as follows:
the steel slag contains 15-30% of total iron (TFe), and the chemical composition of iron-containing substances comprises Fe and Fe 2 O 3 、FeO、Fe 3 O 4 . Wherein Fe 2 O 3 With alpha-Fe 2 O 3 And gamma-Fe 2 O 3 Two homogeneous polytropic variants. The former is stable under natural conditions and is called hematite; the latter being inferior to alpha-Fe in nature 2 O 3 Stable, in a metastable state, known as maghemite. The magnetic iron in the steel slag is Fe or gamma-Fe 2 O 3 、Fe 3 O 4 。
The material which is added into the slag pot and is difficult to reduce and contains iron contains more alpha-Fe 2 O 3 While the medium carbon powder tail mud contains about 20 percent of fixed carbon and about 38 percent of total iron. The fixed carbon contained in the medium carbon powder tail mud and a certain amount of carbon contained in the steel slag can convert Fe at high temperature 2 O 3 Reducing into Fe, reacting carbon with steam at high temperature to generate reducing gases CO and H 2 . And alpha-Fe in the temperature range of 400-600 ℃ in the reducing atmosphere 2 O 3 Can be converted into gamma-Fe 2 O 3 The color changed from dark red to brown and magnetic properties were generated. FeO is an unstable phase at a temperature of 570 ℃ or lower and can be decomposed into alpha-Fe and Fe 3 O 4 While quenching from 570 ℃ inhibits the decomposition reaction. Therefore, a slow cooling method is required to obtain more magnetic iron-containing substances. The added stone powder mainly contains hydrous calcium carbonate (CaCO) 3 ) Which is decomposed into calcium oxide (CaO) and carbon dioxide (CO) at high temperature 2 ) Providing supersaturated calcium oxide increases the C/S to cause the RO phase to decompose to form an easily grindable mineral, magnetic iron oxide. The added materials can be uniformly mixed with the high-temperature liquid steel slag by stirring, and the reaction is complete. The steel slag is basically solidified when the temperature is about 900 ℃, the steel slag needs to be turned over within the temperature range of 600-900 ℃ and atomized water is sprayed in a proper amount to reduce the flying dust so as not to cause the over-large block size of the product. Through the steel slag one-step treatment steps, sensible heat of the steel slag is utilized to promote a series of physical and chemical reactions between the high-temperature liquid steel slag and the added powder needing reduction and magnetizing roasting.
The sensible heat of the steel slag is fully utilized by adding the modified powder, the following reaction is carried out, so that the magnetic iron content of the product is improved, the grindability is enhanced, and the method has more advantages compared with the traditional treatment mode.
(1) The added material which is difficult to reduce and contains iron contains more alpha-Fe 2 O 3 The medium carbon powder tail mud contains about 20% of fixed carbon: 2Fe 2 O 3 +3C＝4Fe+3CO 2 (Fe can be selected by magnetic separation, the material magnetic separation rate improves the economic benefit, the iron content of the tailings is reduced, and the later treatment is facilitated)
(2) The added stone powder mainly contains hydrous calcium carbonate (CaCO) 3 )：
CaCO 3 →CaO+CO 2 (1)
2(CaO)+(Fe 2 O 3 )→(2CaO Fe 2 O 3 ) (2)
x(MgO)+y(FeO)→(MgO) x (FeO) y (4)
From the chemical formula (2), it is found that Fe in slag increases with the CaO content 2 O 3 Continuously consume and generate 2CaO Fe 2 O 3 Resulting in the equilibrium of formula (3) in favor of Fe 2 O 3 The content of FeO in the slag is reduced, and the chemical formula (4) shows that the RO phase difference which is difficult to grind in the slag is less, and the grindability is improved.
(3) More magnetic iron-containing substances are obtained by adopting a slow cooling mode:
4FeO→α-Fe+Fe 3 O 4
α-Fe 2 O 3 →γ-Fe 2 O 3
(the three products all have magnetism and can be selected by magnetic separation, the magnetic separation rate improves the economic benefit and improves, and the reduction of the iron content of the tailings is beneficial to the post-treatment).
Through tests, compared with the original mode, the yield of the magnetic separation powder after the treatment process can be improved by 51.7 percent at most, and the median diameter fineness after 5min grinding can be improved by 18.2 percent at most. The treatment mode can greatly increase the content of magnetic iron-containing substances in the steel slag, reduce RO phase and improve the grindability of the steel slag. Provides good conditions for subsequent secondary treatment and tailing resource utilization, and has the advantages of safe process, simple operation, low cost, and better economic value and environmental protection value. And performing synergistic treatment on the solid wastes. Because sensible heat is fully utilized, only a small amount of water is needed to remove dust, and compared with the traditional hot splashing and hot smoldering steel slag treatment method, the method can save 0.3 to 1.5 tons of water per ton of steel slag.
Table 1 shows the yield (%)
TABLE 2 particle size (mum) of the steel slag after grinding modified by adding different proportions of the mixture
Example 1 (the first formulation of the present invention) a steel slag pot was first filled with about 45% medium carbon powder tail mud, the second layer was filled with about 10% stone powder, 45% non-reducible iron-containing material was added, and finally liquid steel slag, 9 times the mass of which was added to the slag pot, was stirred by a stirring device made of refractory material (high temperature resistant stirring device), the components obtained after stirring were more magnetic iron-containing material and less RO phase, a small amount of water was added to the slag pot during stirring to prevent dust raising, and the slag pot was moved to another high temperature resistant yard (tank) when the overall temperature of the material decreased from about 1500 ℃ to about 450 ℃ and the material was naturally cooled to 60 ℃ and discharged. Through tests, compared with the original mode, the yield of the magnetic separation powder after the treatment process can be improved by 30.6 percent, and the median diameter fineness after 5min grinding can be improved by 11.7 percent.
In the second formulation of the invention, about 45% of medium carbon powder tail mud is paved in a steel slag tank, about 10% of stone powder is paved on the second layer, 45% of materials which are difficult to reduce and contain iron are added, liquid steel slag with 6 times of the mass of powder is added into the slag tank and is stirred by a stirring device, the components obtained after stirring are more magnetic iron-containing substances and less RO phases, a small amount of water is pumped into the slag tank during stirring to prevent dust raising, and when the overall temperature of the materials is reduced from about 1500 ℃ to about 450 ℃, the slag tank is moved to another high temperature resistant storage yard (pool) and the materials can be discharged when being naturally cooled to 60 ℃. Through tests, compared with the original mode, the yield of the magnetic separation powder after the treatment process can be improved by 51.7 percent at most, and the median diameter fineness after 5min grinding can be improved by 18.2 percent at most.
As shown in fig. 1, the high temperature resistant stirring apparatus includes:
a base 8; its function of fixing and supporting other parts
A lifting motor 7 arranged on the base 8; used for driving the lifting arm 6 to upgrade on the base 8;
the lifting arm 6 is vertically arranged on the base 8 in a lifting way and is connected with the lifting motor 7; the stirring blade is used for driving the stirring blade 2 to insert into the steel slag when working and leave the steel slag after stirring;
the cross arm 4 is arranged along the horizontal direction and is fixedly connected to the lifting arm 6; the cross arm 4 is lifted along with the lifting arm 6;
the stirring motor 5 is arranged on the cross arm 4;
the stirring shaft 3 is vertically arranged, is connected below the cross arm 4, is connected with the stirring motor 5 and is driven by the stirring motor 5 to rotate;
the stirring blade 2 is connected below the stirring shaft 3, is driven by a stirring motor 5 and rotates along with the rotation of the stirring shaft 3; in order to realize the stirring of the high-temperature steel slag, the base material of the stirring blade 2 is metal, such as steel, the outer coating layer is made of refractory material or high-temperature resistant material or the surface of the outer coating layer is coated with refractory material or high-temperature resistant material layer, the refractory material stirring device can resist 1600 ℃ of high temperature, and some existing refractory materials or high-temperature resistant materials can be adopted, for example: (1) the patent application number 201810293388.7 'inorganic high-temperature-resistant coating and a preparation method of the inorganic high-temperature-resistant coating', the prepared coating has high hardness, adhesion, heat resistance, wear resistance, corrosion resistance, rust resistance, water resistance and good chemicals, and can resist 1650 ℃ high temperature. (2) The patent application number is 200810150372.7 'the preparation method of the high-temperature resistant coating on the surface of the carbon/silicon carbide composite material', which is a technical scheme for preparing the high-temperature resistant material by using carbon and silicon carbide, and is an inorganic high-temperature resistant material.
Further, the high temperature resistant stirring device comprises: the setting is at the removal wheel 9 of 8 bottoms on base to realize that high temperature resistant agitating unit can remove in a flexible way and stir to the assigned position, accomplish after the stirring nimble safe region of removing to keeping away from slag ladle or slag bath.
Furthermore, as shown in fig. 1, the base 8 is rectangular, the lifting arm 6 is in a (telescopic) straight rod shape, the lifting arm 6 is positioned at the left end of the base 8 and is vertical to the upper surface of the base 8 to form an L shape, and the lifting motor 7 is positioned at the right side of the lifting arm 6 so as to be away from the steel slag pot 1 during work; the cross arm 4 extends outwards from the lifting arm 6, extends leftwards in the figure 1, the stirring shaft 3 is arranged at the right end of the cross arm 4, the stirring motor 5 is arranged at the left end of the cross arm 4, namely, the position close to the lifting arm 6 or far away from the stirring shaft 3, so that the heat radiation of the steel slag tank 1 is reduced as much as possible, the stirring device is convenient to adapt to the occasions of high-temperature work by adopting the structure, and the electric wires of all motors can be wired inside the cross arm 4 or the lifting arm 6 and/or protected by adopting a heat-releasing sleeve.
The stirring process is as follows:
a steel slag tank 1 is lifted by a travelling crane and placed in a designated area, then a certain amount of modified powder is poured into the steel slag tank by a forklift or a travelling crane, then another steel slag tank filled with enough (not less than 6 times of the added powder) liquid high-temperature steel slag is lifted by the travelling crane to add the internal high-temperature steel slag into the steel slag tank filled with the powder, then a high-temperature stirring device is moved to the side 1 of the steel slag tank, a lifting motor 7 is used for controlling a cross arm 4 to descend to drive a stirring blade 2 with a surface coated with a high-temperature-resistant coating to enter the liquid level of the liquid steel slag, a stirring shaft is driven by the stirring motor to drive the stirring blade to stir the steel slag powder mixture in the steel slag tank to uniformly mix the mixture, the stirring is stopped after a certain time, the stirring and the stirring blade is lifted to move the stirring device away, and the mixed material in the steel slag tank is moved to another high-temperature-resistant yard (pool) when the temperature of the mixed material in the steel slag tank is reduced to below 450 ℃, so that the steel slag is slowly cooled, the highest magnetic separation yield is ensured, more sensible heat is utilized, and the material can be discharged when the material is naturally cooled to 60 ℃.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. The steel slag treatment method is characterized by comprising the following steps:
step A: adding powder: in a container for containing steel slag, firstly laying 35-55% of medium carbon powder tail mud, laying 5-10% of stone powder on the second layer, and then adding 35-55% of materials which are difficult to reduce and contain iron;
and B, step B: stirring and cooling: adding liquid steel slag into a container, wherein the liquid steel slag and the powder form a mixture, and stirring the mixture formed by the liquid steel slag and the powder by using a high-temperature-resistant stirring device, wherein the overall temperature of the mixture is reduced from 1500 ℃ to below 500 ℃;
and C: transferring and slow cooling: in order to ensure the capability of treating the steel slag, the mixture with the temperature of below 500 ℃ obtained in the step B is moved to another high-temperature-resistant storage yard, and the steel slag is slowly cooled to below 60 ℃ so as to be discharged; the medium carbon powder tail mud contains about 20 percent of fixed carbon and about 38 percent of total iron, has the grain diameter of about 0.1mm and containsThe water rate is 15% -20%; the stone powder is natural stone powder, and the main component is hydrous calcium carbonate CaCO 3 The content is not less than 90 percent, and the particle size is between 0.1mm and 0.3mm; the iron grade of the iron-containing material difficult to reduce is 35-47%, the content of silicon dioxide is 20-25%, and the grain size of the iron-containing material in a tank is controlled to be below 0.5 mm;
the container for containing the steel slag is a steel slag tank;
compared with the original mode, the yield of the magnetic separation powder can be improved by 51.7 percent to the maximum extent, and the median diameter fineness after 5min of grinding can be improved by 18.2 percent to the maximum extent;
only a small amount of water is needed to remove dust, and compared with the traditional hot splashing and hot stuffy steel slag treatment method, the water can be saved by 0.3 to 1.5 tons per ton of steel slag;
the sensible heat of the steel slag is fully utilized by adding the modified powder, and the reaction is carried out, so that the magnetic iron content of the product is improved, and the grindability is enhanced.
2. The steel slag treatment method according to claim 1, wherein the liquid steel slag is added at a temperature of 1300 ℃ to 1700 ℃, and has a chemical composition of 40% to 55% by weight of CaO, 10% to 20% by weight of SiO 2 、15%~30%Fe 2 O 3 、5%~15%FeO、3%~5%MgO、2%~8%Al 2 O 3 。
3. The steel slag treatment method according to claim 1, wherein the liquid steel slag is added in a main phase of 30-60% 2 S、5%~20%C 3 S, 15% -25% RO phase, 2% -10% f-CaO.
4. The steel slag treatment method according to claim 1, wherein the high-temperature-resistant stirring device comprises:
a base (8);
a lifting motor (7) arranged on the base (8);
the lifting arm (6) is vertically arranged on the base (8) in a lifting way and is connected with the lifting motor (7);
the cross arm (4) is arranged along the horizontal direction and is connected to the lifting arm (6);
the stirring motor (5) is arranged on the cross arm (4);
the stirring shaft (3) is vertically arranged and connected below the cross arm (4);
and the stirring blade (2) is connected below the stirring shaft (3).
5. The steel slag treatment method according to claim 4, wherein the high-temperature-resistant stirring device comprises: a moving wheel (9) arranged at the bottom of the base (8).
6. The steel slag treatment method according to claim 1, wherein the mass ratio of the addition amount of the powder to the liquid steel slag is 1.
7. The steel slag treatment method according to claim 1, wherein the mass ratio of the addition amount of the powder to the liquid steel slag is 1.
8. The steel slag treatment method according to claim 1, wherein the temperature of the steel slag before the transfer is controlled to be 400 ℃ to 450 ℃.
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| JP4702254B2 (en) * | 2006-10-13 | 2011-06-15 | 住友金属工業株式会社 | Thick steel plate for laser cutting and its manufacturing method |
| CN102605117A (en) * | 2012-04-18 | 2012-07-25 | 长沙凯瑞重工机械有限公司 | Steel slag hot-integrating slag ladle provided with stirring device |
| CN103789467B (en) * | 2014-02-19 | 2015-08-05 | 中冶建筑研究总院有限公司 | A kind of block steel slag remelting modified with reduction treatment process |
| CN109663532A (en) * | 2018-12-27 | 2019-04-23 | 天津航天长征技术装备有限公司 | A kind of Novel molten aluminum recirculation unit |
| CN110055370B (en) * | 2019-04-30 | 2021-06-04 | 马鞍山钢铁股份有限公司 | High-temperature steel slag modifier and modification pretreatment process |
| CN111850193A (en) * | 2020-08-04 | 2020-10-30 | 中冶节能环保有限责任公司 | Online quenching and tempering device and method for slag discharging and cooling process of molten steel slag |
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