CN110055370B - High-temperature steel slag modifier and modification pretreatment process - Google Patents
High-temperature steel slag modifier and modification pretreatment process Download PDFInfo
- Publication number
- CN110055370B CN110055370B CN201910357977.1A CN201910357977A CN110055370B CN 110055370 B CN110055370 B CN 110055370B CN 201910357977 A CN201910357977 A CN 201910357977A CN 110055370 B CN110055370 B CN 110055370B
- Authority
- CN
- China
- Prior art keywords
- steel slag
- substance
- silicon
- slag
- simple substance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a high-temperature steel slag modifier and a modification pretreatment process, and belongs to the technical field of steel slag modification. The silicon-carbon composite material comprises a simple substance silicon-containing substance and a simple substance carbon-containing substance, wherein the content of the simple substance silicon in the simple substance silicon-containing substance is more than or equal to 60 percent; the content of the simple substance carbon in the simple substance carbon-containing substance is more than or equal to 80 percent. The invention also discloses a high-temperature steel slag modification pretreatment process, which comprises the following steps: 1) adding a substance containing simple substance carbon and a substance containing simple substance silicon into a slag pot in advance; 2) when the converter discharges slag, adding the substance containing simple substance silicon into the slag pot; 3) after the slag is discharged, blowing nitrogen into the materials, and collecting generated dust; 4) carrying out hot smoldering treatment on the steel slag subjected to the nitrogen blowing treatment in the step 3). The invention can effectively improve the stability and the grindability of the steel slag and improve the recovery rate of the steel slag.
Description
Technical Field
The invention belongs to the technical field of steel slag modification, and particularly relates to a high-temperature steel slag modifier and a modification pretreatment process.
Background
At present, the accumulated steel slag in China is more than 10 hundred million tons, the quantity of the steel slag is increased by about 1 million tons every year according to 8 million tons of crude steel produced per year, the comprehensive utilization rate of resources of the steel slag is less than 30 percent at present, iron-containing materials are removed and recycled, a small quantity of the steel slag is used for cement, roads and the like, the steel tailings after magnetic separation which exceeds 70 percent of the total quantity of the steel slag are not effectively utilized, a large quantity of the steel slag occupies land, pollutes soil, increases the concentration of dust in the atmosphere and the like. The utilization of the steel slag is the comprehensive utilization of resources and also the treatment of environmental pollution.
The problems of complex steel slag components, poor grindability, poor stability, low early strength and the like are key factors for restricting the resource utilization of the steel slag, so that the steel slag utilization problem is fundamentally solved by modifying the steel slag, and a lot of related researches are carried out in China.
In the prior art, CN104673965A, an on-line modification method for liquid steel slag, discloses a method for improving the alkalinity of steel slag by decomposing carbonate by utilizing the sensible heat of high-temperature steel slag and returning the modified steel slag to be used as a converter slagging agent by adopting one or more carbonate substances as a modifier and directly adding the modifier into the high-temperature liquid steel slag. The invention mainly improves the alkalinity of the steel slag by modification so that the steel slag has a better dephosphorization effect, thereby realizing the recycling of the steel slag in the converter process, but the steel slag inevitably faces the discharge problem after being recycled for a certain number of times, finally the comprehensive utilization problem of the steel slag in other aspects needs to be considered, the discharged steel slag has higher alkalinity, and the subsequent comprehensive utilization of the steel slag is more difficult along with high content of free CaO, and the invention does not provide a specific scheme.
The utility model patent of the utility model with the publication number of CN203582742U discloses an autoclave for steel slag modification treatment, through the chemical reaction between the steam in the reaction kettle and substances such as calcium oxide, magnesium oxide and the like in the steel slag in the steam-pressing process, the volume expansion of the steel slag is eliminated and the granulation of the steel slag is realized, the utility model is similar to the still kettle principle described in the prior art of a vertical steel slag autoclave with pressure, heat and stuffiness and a steel slag processing method with publication number CN105063255A, the method and the device have certain effects on improving the stability of the steel slag and granulating effect, but the liquid steel slag needs to be pretreated, the investment and the operation cost are higher, and the content of free CaO of the hot stuffy steel slag is 2 to 3 percent according to the current operation practice, although the amount of the hot splashing is reduced compared with the traditional hot splashing, the hidden danger of stability in the aspect of using the hot splashing for roads and building materials is still difficult to eliminate.
In the prior art "a steel slag stability modifier and steel slag stability processing method" with publication number CN101328517A, a steel slag stability modifier composed of one or a mixture of several of blast furnace slag, quartz sand and river sand and a method for modifying steel slag by blowing nitrogen and stirring are provided. The method can improve the stability of the steel slag by reducing the alkalinity of the steel slag, but the blowing of oxygen can oxidize the ferrite in the steel slag to reduce the recovery of the ferrite in the steel slag, and simultaneously, the iron oxide is combined with nonmetal components such as CaO in the slag to form high-hardness low-gelling activity minerals such as calcium ferrite and the like, thereby influencing the comprehensive utilization of subsequent resources of the steel slag.
The prior art CN105110660A discloses a method for reducing and quenching and tempering molten steel slag under reducing atmosphere, which comprises the following steps: firstly, crushing and grinding the steel slag and the reducing component regulating material until the specific Bosch surface area is 200-400 m2Adding a proper amount of water into the mixture, uniformly mixing the mixture, pressing the mixture into a test cake, drying the test cake, then placing the test cake into a high-temperature furnace in a reducing atmosphere for calcination (in the test, firstly vacuumizing the high-temperature furnace), carrying out calcination at 1300-1600 ℃ under the atmosphere protection, keeping the temperature for more than 30min, carrying out chemical reaction on the components at high temperature, and finally cooling, crushing and grinding the reduced material to prepare the modified steel slag powder. In the prior art, Fe in steel slag is used2O3And FeO is reduced into simple substance iron, and the iron-aluminum-calcium phase can be decomposed to release CaO on the other hand, both the iron phase and the aluminum-calcium phase are beneficial to the formation of silicate minerals with high gelling activity, so that the mineral composition of the steel slag is essentially optimized, and the gelling activity of the steel slag is improved. The recovery rate of the simple substance iron is improved in the prior art, but corresponding treatment measures are not taken for the problem of free CaO in the steel slag, and the problem of stability of the steel slag is not solved by the technology.
Disclosure of Invention
1. Problems to be solved
Aiming at the technical problem of poor effect of modifying and pretreating steel slag in the prior art, the invention provides a high-temperature steel slag modifying and pretreating process, which can improve the stability and the grindability of steel slag and the recovery rate of steel slag.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a high-temperature steel slag modifier comprises a simple substance silicon-containing substance and a simple substance carbon-containing substance, wherein the content of simple substance silicon in the simple substance silicon-containing substance is more than or equal to 60 percent; the content of the simple substance carbon in the simple substance carbon-containing substance is more than or equal to 80 percent.
Preferably, the weight ratio of the simple substance silicon to the simple substance carbon in the modifier is (10-30): 1.
Preferably, the content of the single silicon in the modifier is 3-5% of the weight of the steel slag to be treated.
Preferably, the substance containing the simple substance carbon is one or more of graphite, activated carbon, bituminous coal, anthracite, lignite and coal gangue.
Preferably, the substance containing the simple substance silicon is one or more of silicon powder, industrial silicon and ferrosilicon.
A high-temperature steel slag modification pretreatment process comprises the following steps:
1) adding a substance containing simple substance carbon and a substance containing simple substance silicon into a slag pot in advance;
2) when the converter discharges slag, adding the substance containing simple substance silicon into the slag pot;
3) after the slag is discharged, blowing nitrogen into the materials, and collecting generated dust;
4) carrying out hot smoldering treatment on the steel slag subjected to the nitrogen blowing treatment in the step 3).
Preferably, the content of the elemental carbon in the elemental carbon-containing substance in the step 1) is 0.1-0.3% of the weight of the steel slag to be treated.
Preferably, the content of the elemental silicon in the elemental silicon-containing substance in the step 1) is 3-5% of the weight of the steel slag to be treated.
Preferably, the mass ratio of the adding of the elemental silicon-containing substance in step 1) to the adding of the elemental silicon-containing substance in step 2) is 1: 2.
Preferably, the particle size of the simple substance carbon-containing substance and the particle size of the simple substance silicon-containing substance are both controlled to be 0.5-2 mm.
Preferably, the adding of the elemental silicon-containing substance in the step 2) and the steel slag are completed simultaneously.
Preferably, the pressure of the nitrogen blowing in the step 3) is 0.5-0.7 MPa.
Preferably, a dust collection cover is arranged above the slag pot, and the dust in the step 3) is collected.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the modifier containing the elemental silicon is added, so that the high-temperature modification of the high-temperature liquid steel slag is realized, the alkalinity and the free CaO content of the steel slag are reduced, and the grindability and the gelling property of the steel slag are improved, wherein the elemental silicon has three functions: firstly, the simple substance silicon reacts with iron oxide in the steel slag, and the iron can be recovered after the iron oxide is reduced into iron; secondly, during the reaction, the generated silicon dioxide can further react with free calcium oxide in the steel slag to generate silicate minerals with high gelling activity, the steel slag after the modification pretreatment has high silicate content, and the gelling activity is obviously improved after the steel slag micro powder is ground; thirdly, because the generated silicon dioxide and calcium oxide have endothermic reaction, the temperature of the system is reduced, and the process of reducing iron oxide by simple substance silicon provides heat compensation for the system, so that the system avoids temperature loss caused by adding cold modifier.
(2) Because the material containing the simple substance silicon has high cost, partial simple substance carbon is adopted to replace the simple substance silicon in order to reduce the pretreatment cost; for partially reducing iron oxide in steel slag; adding a small amount of simple substance silicon, reducing the silicon dioxide generated by ferric oxide, and then reacting with calcium oxide to generate silicate minerals with high gelling activity.
(3) The modifier of the invention has the content of the simple substance silicon of more than or equal to 60 percent, which avoids the influence on the property of the modified steel slag caused by excessive introduced impurities due to the excessively low content of the simple substance silicon and ensures that the modifier provides enough SiO in the modification process2So as to reduce the alkalinity of the steel slag, thereby reducing the free CaO content of the steel slag, and simultaneously, the simple substance silicon is FeOnThe compounds oxidize while providing thermal compensation.
(4) The modifier contains more than or equal to 80 percent of simple substance carbon in a substance containing simple substance carbon, so that the problem that the property of the modified steel slag is influenced by excessive introduced impurities due to the excessively low content of the simple substance carbon is avoided, the modifier is ensured to form a good reducing atmosphere in the reaction process, and the introduction of ash and impurities is reduced.
(5) The weight ratio of the simple substance silicon to the simple substance carbon in the modifier is preferably (10-30): 1, because the iron oxide content in the steel slag is 20-30%, and the calcium oxide content is generally 35-50%, the following reactions mainly occur:
2Fe2O3+3C→4Fe+3CO2
2FeO+C→2Fe+CO2
2Fe2O3+3Si→4Fe+3SiO2
2FeO+Si→2Fe+SiO2
2CaO+SiO2→Ca2SiO4
when the weight ratio of the obtained simple substance silicon to the simple substance carbon is (10-30): 1, the elimination of free calcium oxide can be ensured, and the materials can be fully mixed to form a reducing atmosphere when the steel slag is added, so that the modification effect is further improved.
(6) The invention discloses a high-temperature steel slag modification pretreatment process, which comprises the steps of firstly, respectively adding a substance containing simple substance carbon and a substance containing simple substance silicon into a slag tank, aiming at considering that the substance containing simple substance carbon has small specific gravity and is combusted at high temperature to be gas, placing the substance at the bottom of a slag tank before slag receiving, being beneficial to promoting the contact reaction of the substance containing simple substance carbon and iron oxide in the steel slag, and instantly generating a large amount of CO when the steel slag is contacted with carbon2(ii) a Adding the simple substance silicon modifier to the bottom of the slag tank before slag receiving, and utilizing the impact effect and a large amount of CO formed by the falling of high-temperature steel slag into the bottom of the slag tank in the early stage of slag discharging2The gas plays a certain stirring role to form a reducing atmosphere, which is more beneficial to the contact reaction of the modifier and the steel slag; when the converter discharges slag, a substance containing simple substance silicon is added into the slag pot at the same time, which aims to improve the distribution uniformity and contact reaction effect of the modifier in the steel slag by utilizing the mixing process that the high-temperature steel slag and the modifier fall into a slag tank synchronously; after the slag is discharged, nitrogen is blown into the materials, so that the phenomenon that the metallic iron reduced by the modifier at the early stage is oxidized by air in the air blowing process in the prior art is avoided, the modifier is better melted by blowing the nitrogen, and meanwhile, the stirring effect can be achieved, and the modification effect is improved; and meanwhile, the generated dust is collected, so that dust pollution is avoided.
(7) According to the invention, two modifiers (silicon-containing substances and substances containing simple substance carbon) are fed into the converter through the charging bucket near the slag discharge port during slag discharge of the converter, so that high-temperature modification of high-temperature liquid steel slag is realized, the alkalinity and free CaO content of the steel slag are reduced, and the grindability and the gelatinization property of the steel slag are improved; in the embodiment 1, the steel slag is subjected to modification pretreatment according to the method of the invention, and after the treatment, the content of free CaO in the steel slag is reduced from 2.6 percent before modification to 1.1 percent after modification; after the steel slag is modified and the elemental iron is removed, the average iron content in the steel slag is reduced from 25.3% to 19.2%, and the recovery rate of the elemental iron is greatly improved; according to standard detection results, the ground steel slag micro powder has the 7d activity index of 70-73% and the 28d activity index of 85-91%, and is obviously improved compared with unmodified steel slag.
Drawings
FIG. 1 is a schematic view of a steel slag modification pretreatment process according to the present invention;
in the figure: 1. a converter; 2. a modifier A material tank; 3. a modifier B tank; 4. a slag pot; 5. flatbed vehicle; 6. a metal tube; 7. nitrogen gas; 8. a dust collection cover.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
In the embodiment, the high-temperature steel slag modifier consists of coal powder with the elemental carbon content of 83% and silicon powder with the elemental silicon content of 72%, wherein the granularity of the coal powder is 0.5-1.5 mm, and the granularity of the silicon powder is 1-2 mm.
The adding amount of the coal powder is 0.2 percent of the weight of the steel slag, the total adding amount of the silicon powder is 5 percent of the weight of the steel slag, namely the actual adding amount of the simple substance C is 0.166 percent of the weight of the slag, and the actual adding amount of the simple substance silicon is 3.6 percent of the weight of the slag.
As shown in figure 1, a flat car carrying a slag pot is placed below a converter mouth, a converter 1 starts to slag, a bin filled with a modifier is arranged beside the slag pot, a silicon-containing substance A and a simple substance carbon-containing substance B in the modifier are respectively stored in a modifier A bin 2 and a modifier B bin 3 and fed through a bin spiral feeder, and a feeding port is positioned about 1 meter above the mouth of a slag receiving pot 4. In the blowing process, a dust collection cover is arranged above the slag tank in the nitrogen blowing operation area of the slag tank.
1) When slag is discharged from a 300t converter, according to the slag amount of 30t, before a slag tank 4 receives slag, a feeding valve of a modifier B bin 3 is opened, modifier B (coal powder, the content of simple substance carbon is 83%, and the particle size is 0.5-1.5 mm) is added according to the proportion of 0.2% of the slag amount, about 0.06 ton is accumulated, 1/3 about 0.5t of modifier A (silicon powder, the content of simple substance silicon is 72%, and the particle size is 1-2 mm) of the simple substance silicon-containing substance (silicon powder in the embodiment) in a modifier A bin 2 is added to the bottom of the slag tank 4 to start slag receiving, a slag discharging sample in the converter 1 is taken for detection, and the TFe content is 25.3%;
2) simultaneously adding the remaining 2/3 elemental silicon-containing substance (elemental silicon powder) 1t into the slag pot 4 while tapping slag in the converter 1, and controlling the flow rate of the silicon powder to finish adding the silicon powder before the tapping of the converter 1 is finished;
3) after the modifier is added, the slag pot 4 is immediately conveyed to a blowing operation station of a slag treatment room by adopting a flat car 5, a dust hood 8 is ensured to be in a working state before the blowing of nitrogen 7 is started, a metal pipe 6 connected with nitrogen is immediately inserted into the slag pot 4 to start the blowing of the nitrogen 7, and the pressure is 0.6MPa until the modifier is completely melted and is uniformly stirred;
4) and after the nitrogen-blowing stirring is finished, hoisting the slag tank to a hot-closed operation area for hot-closed treatment, and obtaining the pretreated steel slag after the hot-closed treatment.
The pretreated steel slag is magnetically attracted to recover elementary iron, and after the steel slag is micro-powder, the content of free CaO is 1.1 percent, and the specific surface area is 410m2The TFe content of the steel slag powder is 19.2 percent per kg, and the standard detection results of GB/T20491-2006 Steel slag powder used in cement and concrete are shown in the following table 1.
Table 1 example 1 modified steel slag and steel slag powder activity index thereof
The results show that: compared with unmodified steel slag powder, the steel slag powder modified by the method disclosed by the invention has the advantages that the free CaO content is reduced by 1.5%, the TFe content in the steel slag powder is reduced by 6.2%, the 7d activity index is improved by 4%, and the 28d activity index is improved by 8%.
Comparative example 1
This comparative example is essentially the same procedure as example 1, except that: silicon powder (the content of simple substance silicon is 72%) is adopted to replace the coal powder in the step 1), the adding amount is 0.069t, namely 0.23% of the weight of the steel slag, and the actual adding amount of the simple substance silicon is 0.166% of the weight of the slag.
The pretreated steel slag is magnetically attracted to recover simple substance iron, and after the steel slag tailings are ground into micro powder, the content of free CaO is 1.5 percent, and the specific surface area is 410m2The TFe content of the steel slag powder is 21.3 percent per kg, and the standard detection results of GB/T20491-2006 Steel slag powder used in cement and concrete are shown in the following table 2.
Table 2 comparative example 1 modified steel slag and steel slag powder activity index thereof
The results show that the coal dust added in the step 1) in the example 1 plays a key role in mixing the silicon powder and the steel slag, and when the coal dust added in advance is changed into the silicon powder, although the silicon powder also has the reducing performance, the coal dust is not fully mixed with the steel slag, the iron oxide cannot be fully reduced, and the formed SiO2The reaction is not fully performed, the recycled simple substance iron is less, and the iron content in the modified steel slag powder is still higher; the reduction range of free CaO is small, which is not beneficial to subsequent utilization.
Comparative example 2
This comparative example is essentially the same procedure as example 1, except that: the coal powder and part of silicon powder are not added in advance, and the coal powder, the silicon powder and the steel slag are directly added into the slag tank at the same time.
The pretreated steel slag is magnetically attracted to recover elementary iron, and after the steel slag is micro-powder, the content of free CaO is 1.4 percent, and the specific surface area is 410m2The TFe content of the steel slag powder is 20.9 percent per kg, and the standard detection results of GB/T20491-2006 Steel slag powder used in cement and concrete are shown in the following table 3.
TABLE 3 COMPARATIVE EXAMPLE 2 modified Steel slag and its slag powder activity index
The result shows that the coal powder added in advance in the step 1) of the embodiment 1 plays a key role in mixing the silicon powder and the steel slag, and the coal powder, the silicon powder and the steel slag are simultaneously added into the slag tank, so that although the reduction performance is realized, the reduction effect is slightly poor, the recovered simple substance iron is less, and the iron content in the modified steel slag powder is still higher; the reduction range of free CaO is small, and the subsequent utilization is also not facilitated.
Example 2
This example is essentially the same as example 1 except that:
the modifier in the embodiment comprises activated carbon with the elemental carbon content of 91% and industrial silicon with the elemental silicon content of 93%, wherein the particle size of the activated carbon is 1-2 mm, and the particle size of the industrial silicon is 1-2 mm;
the adding amount of the active carbon is 0.27 percent of the weight of the steel slag, the total adding amount of the industrial silicon is 5.4 percent of the weight of the steel slag, namely the actual adding amount of the simple substance C is 0.25 percent of the weight of the slag, and the actual adding amount of the simple substance silicon is 5 percent of the weight of the slag;
the pressure of nitrogen blowing in the step 3) is 0.7 MPa.
The pretreated steel slag is magnetically absorbed to recover simple substance iron, and after the steel slag is micro-powder, the standard detection result of GB/T20491-2006 Steel slag powder used in cement and concrete is shown in Table 4 below.
Table 4 example 2 modified steel slag and steel slag powder activity index thereof
The results show that: compared with unmodified steel slag powder, the steel slag powder modified by the method has the advantages that the content of free CaO is reduced by 61.5%, TFe in the steel slag powder is reduced by 24.9%, the activity index at 7d is improved by 10.3%, and the activity index at 28d is improved by 2.5%.
Example 3
This example is essentially the same as example 1 except that:
the modifier in the embodiment comprises bituminous coal with the simple substance carbon content of 85% and ferrosilicon with the simple substance silicon content of 75%, wherein the granularity of the bituminous coal is 0.5-2.0 mm, and the granularity of the ferrosilicon is 1-2 mm;
the addition amount of bituminous coal is 0.35 percent of the weight of the steel slag, the total addition amount of ferrosilicon is 4 percent of the weight of the steel slag, namely the actual addition amount of simple substance C is 0.3 percent of the weight of the slag, and the actual addition amount of simple substance silicon is 3 percent of the weight of the slag;
the pressure of nitrogen blowing in the step 3) is 0.5 MPa.
The pretreated steel slag is magnetically absorbed to recover simple substance iron, and after the steel slag is micro-powder, the standard detection result of GB/T20491-2006 Steel slag powder used in cement and concrete is shown in Table 5.
TABLE 5 example 3 modified Steel slag and its slag powder activity index
The results show that: compared with unmodified steel slag powder, the steel slag powder modified by the method has the advantages that the content of free CaO is reduced by 38.5%, TFe in the steel slag powder is reduced by 19.0%, the activity index of 7d is improved by 2.9%, and the activity index of 28d is improved by 1.2%.
Example 4
This example is essentially the same as example 1 except that:
the modifier in the embodiment comprises bituminous coal with the simple substance carbon content of 85% and ferrosilicon with the simple substance silicon content of 75%, wherein the granularity of the bituminous coal is 0.5-2.0 mm, and the granularity of the ferrosilicon is 1-2 mm;
the addition amount of bituminous coal is 0.12 percent of the weight of the steel slag, the total addition amount of ferrosilicon is 4 percent of the weight of the steel slag, namely the actual addition amount of simple substance C is 0.1 percent of the weight of the slag, and the actual addition amount of simple substance silicon is 3 percent of the weight of the slag;
the pretreated steel slag is magnetically absorbed to recover simple substance iron, and after the steel slag is micro-powder, the standard detection result of GB/T20491-2006 Steel slag powder used in cement and concrete is shown in Table 6 below.
TABLE 6 example 4 modified Steel slag and its slag powder activity index
The results show that: compared with unmodified steel slag powder, the steel slag powder modified by the method has the advantages that the content of free CaO is reduced by 38.5%, TFe in the steel slag powder is reduced by 15.0%, the 7d activity index is improved by 5.9%, and the 28d activity index is improved by 2.5%.
Example 5
This example is essentially the same as example 1 except that:
the modifier in the embodiment comprises anthracite with the simple substance carbon content of 85% and ferrosilicon with the simple substance silicon content of 75%, wherein the particle size of the anthracite is 0.5-2 mm, and the particle size of the ferrosilicon is 1-2 mm;
the addition amount of anthracite is 0.23 percent of the weight of the steel slag, the total addition amount of ferrosilicon is 5.33 percent of the weight of the steel slag, namely the actual addition amount of simple substance C is 0.2 percent of the weight of the slag, and the actual addition amount of simple substance silicon is 4 percent of the weight of the slag;
the pretreated steel slag is magnetically absorbed to recover simple substance iron, and after the steel slag is micro-powder, the standard detection result of GB/T20491-2006 Steel slag powder used in cement and concrete is shown in Table 7.
TABLE 7 example 5 modified Steel slag and its slag powder activity index
The results show that: compared with unmodified steel slag powder, the steel slag powder modified by the method has the advantages that the content of free CaO is reduced by 57.7%, TFe in the steel slag powder is reduced by 19.8%, the activity index of 7d is improved by 10.8%, and the activity index of 28d is improved by 4.9%.
Claims (7)
1. A high-temperature steel slag modification pretreatment process is characterized in that the high-temperature steel slag is converter slag; the pretreatment process is carried out by adopting a modifier, wherein the modifier comprises a substance containing simple substance silicon and a substance containing simple substance carbon, and the content of the simple substance silicon in the substance containing simple substance silicon is more than or equal to 60%; the content of the simple substance carbon in the simple substance carbon-containing substance is more than or equal to 80 percent; the weight ratio of the simple substance silicon to the simple substance carbon in the modifier is (10-30) to 1;
the pretreatment process comprises the following steps:
1) adding a substance containing simple substance carbon and a substance containing simple substance silicon into a slag pot in advance;
2) when the converter discharges slag, adding the substance containing simple substance silicon into the slag pot;
3) after the slag is discharged, blowing nitrogen into the materials, and collecting generated dust;
4) carrying out hot smoldering treatment on the steel slag subjected to the nitrogen blowing treatment in the step 3).
2. The high-temperature steel slag modification pretreatment process according to claim 1, wherein the elemental carbon-containing substance is one or more of graphite, activated carbon, bituminous coal, anthracite, lignite, and coal gangue.
3. The high-temperature steel slag modification pretreatment process as claimed in claim 1, wherein the elemental silicon-containing substance is one or more of silicon powder, industrial silicon and ferrosilicon.
4. The high-temperature steel slag modification pretreatment process as claimed in claim 1, wherein the content of elemental carbon in the elemental carbon-containing substance in the step 1) is 0.1-0.3% of the weight of the steel slag to be treated.
5. The high-temperature steel slag modification pretreatment process as claimed in claim 1, wherein the content of elemental silicon in the elemental silicon-containing substance in the step 1) is 3-5% of the weight of the steel slag to be treated.
6. The high-temperature steel slag modification pretreatment process as claimed in claim 1, wherein the mass ratio of the elemental silicon-containing substance added in step 1) to the elemental silicon-containing substance added in step 2) is 1: 2.
7. The high-temperature steel slag modification pretreatment process as claimed in any one of claims 1 to 6, wherein the pressure of the nitrogen blowing in the step 3) is 0.5 to 0.7 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910357977.1A CN110055370B (en) | 2019-04-30 | 2019-04-30 | High-temperature steel slag modifier and modification pretreatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910357977.1A CN110055370B (en) | 2019-04-30 | 2019-04-30 | High-temperature steel slag modifier and modification pretreatment process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110055370A CN110055370A (en) | 2019-07-26 |
| CN110055370B true CN110055370B (en) | 2021-06-04 |
Family
ID=67321626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910357977.1A Active CN110055370B (en) | 2019-04-30 | 2019-04-30 | High-temperature steel slag modifier and modification pretreatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110055370B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111977997B (en) * | 2020-08-27 | 2022-04-26 | 西安建筑科技大学 | Control method for realizing steel slag reduction modification, water-quenched slag and application thereof |
| CN114907028A (en) * | 2021-02-10 | 2022-08-16 | 上海梅山钢铁股份有限公司 | Steel slag modifier and method for modifying converter steel slag |
| CN113355464A (en) * | 2021-05-17 | 2021-09-07 | 首钢长治钢铁有限公司 | High-temperature steel slag modification treatment method, modified steel slag and application thereof |
| CN114292971B (en) * | 2022-01-07 | 2023-03-24 | 广西柳钢环保股份有限公司 | Steel slag treatment method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2103391C1 (en) * | 1994-07-12 | 1998-01-27 | Евгений Михайлович Баранов | METHOD FOR PRODUCING REFRACTORY METALS FROM ORE CONCENTRATES |
| CN102994688A (en) * | 2011-09-16 | 2013-03-27 | 王虎 | Pretreatment technology of terminal steel slag in converter |
| CN103789467A (en) * | 2014-02-19 | 2014-05-14 | 中冶建筑研究总院有限公司 | Method for carrying out remelting, reduction and modification treatment on massive steel slag |
| CN106045301A (en) * | 2016-05-25 | 2016-10-26 | 安徽工业大学 | Method for producing mineral wool by using early-stage molten-state steel slag of converter |
| CN106348626A (en) * | 2016-08-25 | 2017-01-25 | 安徽工业大学 | Method for recovering converter molten steel slag to produce concrete admixture |
| CN108264224A (en) * | 2017-12-30 | 2018-07-10 | 王虎 | A kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process |
| CN108300826A (en) * | 2018-01-31 | 2018-07-20 | 贵州仁聚业科技股份有限公司 | The method for extracting element phosphor and elemental iron from yellow phosphorus by-product ferrophosphorus slag |
-
2019
- 2019-04-30 CN CN201910357977.1A patent/CN110055370B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2103391C1 (en) * | 1994-07-12 | 1998-01-27 | Евгений Михайлович Баранов | METHOD FOR PRODUCING REFRACTORY METALS FROM ORE CONCENTRATES |
| CN102994688A (en) * | 2011-09-16 | 2013-03-27 | 王虎 | Pretreatment technology of terminal steel slag in converter |
| CN103789467A (en) * | 2014-02-19 | 2014-05-14 | 中冶建筑研究总院有限公司 | Method for carrying out remelting, reduction and modification treatment on massive steel slag |
| CN106045301A (en) * | 2016-05-25 | 2016-10-26 | 安徽工业大学 | Method for producing mineral wool by using early-stage molten-state steel slag of converter |
| CN106348626A (en) * | 2016-08-25 | 2017-01-25 | 安徽工业大学 | Method for recovering converter molten steel slag to produce concrete admixture |
| CN108264224A (en) * | 2017-12-30 | 2018-07-10 | 王虎 | A kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process |
| CN108300826A (en) * | 2018-01-31 | 2018-07-20 | 贵州仁聚业科技股份有限公司 | The method for extracting element phosphor and elemental iron from yellow phosphorus by-product ferrophosphorus slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110055370A (en) | 2019-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110055370B (en) | High-temperature steel slag modifier and modification pretreatment process | |
| CN102424875B (en) | Method for preparing sponge iron from sulfate cinder | |
| CN107254585B (en) | A method of recycling zinc, indium, iron, gallium from iron vitriol slag | |
| CN108147443B (en) | Method for extracting aluminum oxide from fly ash and preparing ferro-silicon alloy | |
| CN106676263A (en) | Method and system for comprehensive utilization of copper tailings and converter coarse dust ash | |
| CN103602846B (en) | A kind of method utilizing SILICA FUME to produce Antaciron | |
| CN104498711A (en) | Method for using stainless steel dust to produce chrome, nickel and iron alloy | |
| CN104141018A (en) | Recycling method for steel slag | |
| CN102080135B (en) | Method for reducing and separating gravel iron from refractory ores, complex ores or iron-containing chemical industry tailings | |
| WO2021244616A1 (en) | Two-step method for efficiently separating iron and phosphorus in high-phosphorus iron-bearing resource on basis of gas-based energy | |
| CN115679097B (en) | Method for recycling ironmaking gas ash by using converter slag and refining dust | |
| Du et al. | Direct reduction of copper slag using rubber seed oil as a reductant: Iron recycling and thermokinetics | |
| Shen et al. | Industrial practice of BiPCI process of pulverized coal injection for blast furnace ironmaking at SSAB | |
| CN101538628A (en) | Method for directly reducing laterite-nickel into nickel-bearing ball iron in tunnel kilns | |
| CN112981028B (en) | Method for extracting iron element from red mud | |
| CN107604157B (en) | A method of blast furnace iron carbon composite briquettes are prepared using hot vessel slag | |
| CN115716738B (en) | Production process of high-strength steel slag brick | |
| CN112080598A (en) | Method and system for comprehensively utilizing slag resources of iron and steel smelting and blast furnace slag tank | |
| CN108558244B (en) | Device and method for preparing cement mixture by utilizing thermal state converter slag | |
| CN113846234B (en) | Rotary kiln volatilization treatment method for high-silicon zinc leaching residues | |
| CN101545042A (en) | Method for producing microalloy ferro-silicon by using a ferrous metasilicate electric stove integral deoxidation and reduction | |
| CN110042227B (en) | Sintered ore and preparation method thereof | |
| CN115261540A (en) | Method for recovering iron and tailings in red mud | |
| Gao et al. | Fundamental research in comprehensive utilization of Bayan Obo ore by direct reduction | |
| CN101545044B (en) | Method for producing ferro-silicon by using a ferrous metasilicate electric stove integral deoxidation and reduction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |