CN114292040B - Reduction hardening and tempering agent and application thereof in steel slag treatment - Google Patents

Reduction hardening and tempering agent and application thereof in steel slag treatment Download PDF

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CN114292040B
CN114292040B CN202111509400.1A CN202111509400A CN114292040B CN 114292040 B CN114292040 B CN 114292040B CN 202111509400 A CN202111509400 A CN 202111509400A CN 114292040 B CN114292040 B CN 114292040B
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steel slag
tempering agent
carbon
reduction
reducing
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CN114292040A (en
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王肇嘉
王卉
崔素萍
郑永超
王亚丽
陈旭峰
王明威
房桂明
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Beijing University of Technology
Beijing Building Materials Academy of Sciences Research
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Beijing University of Technology
Beijing Building Materials Academy of Sciences Research
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention relates to the field of building materials, in particular to a reduction hardening and tempering agent and application thereof in steel slag treatment. The reduction quenching and tempering agent comprises 35-90wt% of carbon-containing components; in the carbon-containing component, the fixed carbon is more than or equal to 40.0wt%, the volatile component is less than or equal to 50.0wt%, and the ash content is less than or equal to 10.0wt%; the reduction hardening and tempering agent also comprises fluorite; the mass ratio of the carbon-containing component to the fluorite is (35-90): (2-40). The reduction hardening and tempering agent provided by the invention can not only enable the steel slag to carry out chemical reaction at a lower temperature and reduce and recover valuable metal iron resources, but also can obtain the hardened and tempered steel slag with high gelling activity and no stability problem to be used as building material resources, can realize the full-quantification non-waste utilization of the whole steel slag, and is beneficial to improving the large-scale comprehensive utilization of the steel slag.

Description

Reduction hardening and tempering agent and application thereof in steel slag treatment
Technical Field
The invention relates to the field of building materials, in particular to a reduction hardening and tempering agent and application thereof in steel slag treatment.
Background
The steel slag is waste slag generated in the steel-making process, and is multiphase multi-component solid waste which is formed as a byproduct in the steel-making process and takes mineral phases such as silicate, ferrite and the like. At present, the steel slag stacking quantity is large, the yield is increased day by day, but the comprehensive utilization rate of the steel slag is less than 30 percent. The large amount of steel slag piling not only occupies land, but also causes serious pollution to the environment. At present, the steel slag is taken as a large amount of industrial solid waste which needs harmless, quantitative reduction treatment and comprehensive utilization, and the resource utilization of the steel slag is urgent.
How to really realize the deep treatment, the efficient utilization and the zero emission of the steel slag is always the direction of efforts of related scientific and technical workers. At present, the comprehensive utilization of steel slag mainly comprises the steps of preparing a sintering material, a road engineering material, backfilling, raw cement ingredient, cement admixture, concrete admixture and the like in a steel mill. But the comprehensive utilization rate of the steel slag is still at a lower level overall.
In the field of steel slag building material utilization, the problems of low gelling activity, poor stability and the like of the steel slag powder seriously restrict the large-scale application of the steel slag powder serving as an active mineral admixture in cement and concrete. The reasons for the above problems are mainly: the existing steel slag building material treatment method mainly comprises a physical activation method, a chemical activation method, a thermal activation method and the like, but the methods all belong to rear-end treatment methods, the steel slag used is steel slag tailings which are subjected to hot splashing or hot stuffiness treatment and then magnetic separation, and the steel slag after the treatment still contains about 3.0 percent of free calcium oxide, so that the problem of utilization of building material stability exists; meanwhile, although the content of metallic iron in the steel slag tailings after magnetic separation is obviously reduced, a large amount of iron exists in the steel slag tailings in the form of iron oxide inert minerals, the iron ore phase existing in the form has adverse effects on the gelling activity of the steel slag tailings when the steel slag tailings are utilized by rear-end building materials, and the existing form prevents the iron in the steel slag tailings from being effectively recycled, so that huge waste of metallic iron resources is caused. In conclusion, the conventional steel slag treatment method has limited improvement effect on the gelling activity, has certain limitations, cannot radically change the gelling property of the steel slag, and still does not properly solve the problem of integral large-scale utilization of the steel slag in cement concrete.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a reduction conditioner which can be chemically reacted with steel slag at a lower temperature, the composition of a mineral phase with gelling activity in the obtained conditioned steel slag is improved, the content of free calcium oxide causing poor stability is reduced, and besides, metallic iron resources can be recovered by reduction, so that the whole steel slag is completely quantized and is not utilized; the invention also aims to provide the application of the reducing and tempering agent in the treatment of steel slag.
Specifically, the invention provides the following technical scheme:
the invention provides a reduction quenching and tempering agent, which comprises 35-90wt% of carbon-containing components; in the carbon-containing component, the fixed carbon is more than or equal to 40.0wt%, the volatile component is less than or equal to 50.0wt%, and the ash content is less than or equal to 10.0wt%;
the reduction hardening and tempering agent also comprises fluorite; the mass ratio of the carbon-containing component to the fluorite is (35-90): (2-40).
The invention discovers that the steel slag can be efficiently treated by the scheme, so that the whole steel slag is fully quantized and is not utilized.
Specifically, the carbon-containing component has a reducing effect, the fluorite has a tempering effect, and the fluorite are compounded in a specific proportion, so that the obtained reducing and tempering agent can adjust the mineral composition from the source of the steel slag forming process, and can chemically react with the steel slag at a lower temperature, so that the iron-containing RO phase, calcium ferrite and other inert or low-activity mineral phases in the steel slag are converted into high-gelling-activity mineral phases mainly comprising dicalcium silicate, tricalcium silicate and calcium aluminate phases, and the aluminosilicate minerals with gelling activity in the tempered steel slag are increased; meanwhile, the iron-containing mineral phase in the steel slag is reduced into simple substance iron through the reduction action of carbon, and valuable component metallic iron is effectively separated out and recovered, so that the gelling property of the obtained quenched and tempered steel slag is improved, and the quenched and tempered steel slag can be used as a cement admixture and a concrete admixture, thereby realizing the whole full-quantitative waste-free utilization of the steel slag in the true sense and improving the comprehensive utilization rate of the steel slag.
In order to further improve the treatment effect of the reducing and tempering agent on the steel slag, the invention optimizes the reducing and tempering agent, and the method specifically comprises the following steps:
preferably, the carbon-containing component is coal dust and/or carbon powder.
Preferably, the reduction conditioner also comprises 2-30wt% of desulfurized gypsum.
Preferably, the reduction quenching and tempering agent also comprises 0-25wt% of barite.
As a preferable scheme of the invention, the reduction hardening and tempering agent comprises the following components in parts by weight: 35-90 parts of carbon-containing component, 2-40 parts of fluorite, 2-30 parts of desulfurized gypsum and 0-25 parts of barite;
wherein the carbon-containing component is coal powder and/or carbon powder.
As a preferred embodiment of the present invention, the reduction conditioner comprises the following components by mass: 35-90wt% of carbon-containing component, 2-40wt% of fluorite, 2-30wt% of desulfurized gypsum and 0-25wt% of barite;
wherein the carbon-containing component is coal powder and/or carbon powder.
Preferably, the specific surface area of the reduction conditioner is 200m 2 More than/kg; further, the specific surface area of the reduction conditioner is 280-320m 2 /kg。
The invention also finds that the reaction efficiency of the reducing and tempering agent and the steel slag can be improved by controlling the specific surface area of the reducing and tempering agent, so that the treatment effect of the steel slag is further optimized.
Thus, the invention provides a reducing and tempering agent for processing steel slag.
The invention also provides a preparation method of the reduction conditioner, which comprises the following steps: the components are mixed evenly according to the proportion.
The invention also provides the application of the reducing and tempering agent in the treatment of steel slag.
Preferably, the steel slag is converter steel slag.
The invention also provides a method for treating the steel slagDrying and grinding the steel slag to the specific surface area of 300m 2 Over/kg, then mixing with the above-mentioned reducing and tempering agent, and calcining.
In the present invention, the specific surface area is 300m 2 The steel slag powder of more than/kg and the reduction quenching and tempering agent are subjected to reduction reaction, so that metallic iron particles can be fully precipitated and separated from molten slag.
Preferably, the processing method comprises:
step (1), drying the steel slag and then grinding the dried steel slag into powder until the specific surface area is 340-400m 2 Per kg, obtaining steel slag powder;
step (2), mixing the steel slag powder and the reduction hardening and tempering agent according to the mass ratio of (80-96): (4-20) mixing, and then calcining.
Preferably, the calcining temperature is 1300-1400 ℃, and the calcining time is more than 30 min;
further, the calcining temperature is 1325-1375 ℃, and the calcining time is 30-70min;
the reduction effect is better when the calcination is carried out under the conditions.
Preferably, the processing method further includes:
and (3) cooling the calcined product to room temperature (25 +/-5 ℃) and separating to obtain the metallic iron and the quenched and tempered steel slag.
Further, the calcined product is cooled by air quenching and quenching.
In the technical scheme, the reduction recovery efficiency of the metallic iron reaches more than 85 percent; in addition, the quenched and tempered steel slag is ground to be 360-450m in specific surface area 2 In kg, the free calcium content of the obtained quenched and tempered steel slag powder is less than 0.78 percent, the problem of stability of building material resource utilization can be solved, the fluidity ratio of the rubber sand of the quenched and tempered steel slag powder reaches more than 95 percent, the 7d activity index reaches more than 68 percent, the 28d activity index reaches more than 85 percent, and the quenched and tempered steel slag powder can be used as a cement admixture and a concrete admixture.
The treatment method provided by the invention is beneficial to regulating and controlling the performance of the steel slag from the source, producing the quenched and tempered steel slag which is more convenient for rear-end building material utilization, reducing the using amount of cement clinker, promoting the efficient comprehensive utilization of the steel slag, and being beneficial to the energy conservation, emission reduction and low-carbon development of steel and building material industry. Specifically, the treatment method not only can reduce ferric oxide and ferrous iron phases in the steel slag into metallic iron at a lower temperature to realize efficient recovery of valuable metallic iron resources, but also increases an aluminosilicate mineral phase with gelling activity in the modulated steel slag, reduces the content of free calcium oxide, eliminates the stability problem, prepares the modified steel slag which can be used for cement admixture and concrete admixture, optimizes the chemical mineral composition of the steel slag from the source, improves the comprehensive performance of the steel slag, and realizes the full-quantitative and waste-free utilization of the whole steel slag.
Based on the scheme, the invention has the following beneficial effects:
according to the invention, a carbon-containing component with a reducing effect is compounded with a fluoride and a sulfide with a tempering effect, the obtained reducing tempering agent can chemically react with the steel slag at a lower temperature to change the phase composition and the structure of the steel slag, promote the formation of intermediate minerals such as calcium fluosilicate and calcium sulfosilicate, reduce the viscosity of a system, improve the reaction activity of Ca-Si-Al-Mg oxide, enable inert or low-activity mineral phases such as an iron-containing RO phase and calcium ferrite in the steel slag to react with the reducing tempering agent and free calcium oxide in series, convert the inert or low-activity mineral phases into a high-gelling-activity mineral phase mainly comprising calcium silicate and calcium aluminate phases, increase aluminosilicate minerals with gelling activity in the tempered steel slag, refine and activate the crystal grains of the active mineral phases, and reduce the content of free calcium oxide in the system; meanwhile, the metallic iron in the steel slag is effectively reduced through the reduction action of the carbon element, so that the original calcium ferrite and iron magnesium are decomposed and transformed in a co-melting phase, the formation of a gelling active mineral in the quenched and tempered steel slag is promoted, the recycled metallic iron can realize the reutilization of valuable resources, and the integral full-quantification and waste-free utilization of the steel slag is realized. The quenched and tempered steel slag obtained after the treatment of the steel slag can be used as a cement admixture and a concrete admixture, has high gelling activity, does not have the problems of poor stability and poor grindability, and obviously improves the large-scale utilization level of the steel slag.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The steel slag powder referred to in the following examples is: putting the steel slag in a drying oven at 105 ℃ for 24 hours, drying the steel slag, crushing the steel slag by using a jaw crusher, and then grinding the steel slag by using a ball mill until the specific surface area is 380m 2 /kg；
Wherein the steel slag is converter steel slag, and the chemical composition of the steel slag is shown in Table 1;
TABLE 1 chemical composition of the steel slags (wt%)
CaO SiO 2 Al 2 O 3 MgO Fe 2 O 3 K 2 O Na 2 O SO 3 P 2 O 5 MnO TiO 2
36.29 12.65 5.41 8.08 28.74 0.19 0.25 0.30 1.70 1.89 1.18
The specific surface areas of the coal powder, the carbon powder, the fluorite, the desulfurized gypsum and the barite which are involved in the following examples are all 200m 2 More than kg.
The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
Example 1
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 40 parts of coal powder, 40 parts of fluorite and 20 parts of desulfurized gypsum;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 2
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 80 parts of carbon powder, 10 parts of fluorite, 5 parts of desulfurized gypsum and 5 parts of barite;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 3
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 65 parts of carbon powder, 5 parts of fluorite and 30 parts of desulfurized gypsum;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 4
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 60 parts of coal powder, 7 parts of fluorite, 20 parts of desulfurized gypsum and 13 parts of barite;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 5
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 55 parts of coal powder, 15 parts of fluorite, 10 parts of desulfurized gypsum and 20 parts of barite;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 6
The embodiment provides a reduction hardening and tempering agent which comprises the following components in parts by weight: 48 parts of coal powder, 27 parts of fluorite, 15 parts of desulfurized gypsum and 10 parts of barite;
the specific surface area of the reduction hardening and tempering agent is 300 +/-10 m 2 /kg。
Example 7
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder and the reducing and tempering agent in the embodiment 1 according to the mass ratio of 90:10, uniformly mixing, placing the mixture in a graphite crucible to calcine in a high-temperature furnace, wherein the calcining temperature is 1300 ℃, the calcining time is 40min, cooling the slag by adopting an air quenching and quenching way after discharging, separating and recovering metallic iron at the bottom and the side wall of the graphite crucible after cooling to room temperature, obtaining quenched and tempered steel slag after iron separation, crushing the quenched and tempered steel slag, and grinding the quenched and tempered steel slag by using a ball mill to obtain the quenched and tempered steel slag with the specific surface area of 390m 2 Perkg of quenched and tempered steel slag powder.
Example 8
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder and the reducing and tempering agent of the embodiment 2 according to a mass ratio of 92:8, uniformly mixing, placing the mixture into a graphite crucible, calcining in a high-temperature furnace at 1350 ℃ for 60min, cooling the molten slag in an air quenching and quenching way after discharging, and cooling to room temperatureSeparating and recovering the metallic iron at the bottom and the side wall of the graphite crucible, obtaining the tempered steel slag after iron separation, crushing the tempered steel slag, and grinding the tempered steel slag by a ball mill to obtain the steel slag with the specific surface area of 420m 2 Perkg of quenched and tempered steel slag powder.
Example 9
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder with the reducing and tempering agent in the embodiment 3 according to the mass ratio of 86:14, uniformly mixing, placing the mixture in a graphite crucible to calcine in a high-temperature furnace, wherein the calcining temperature is 1350 ℃, the calcining time is 40min, cooling the molten slag by adopting an air quenching and quenching mode after discharging, separating and recovering metallic iron at the bottom and the side wall of the graphite crucible after cooling to room temperature, obtaining tempered steel slag after iron separation, crushing the tempered steel slag, and grinding the tempered steel slag by using a ball mill to obtain the tempered steel slag with the specific surface area of 400m 2 Perkg of quenched and tempered steel slag powder.
Example 10
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder and the reducing and tempering agent of the embodiment 4 according to the mass ratio of 85:15, uniformly mixing, placing the mixture in a graphite crucible to calcine in a high-temperature furnace, wherein the calcining temperature is 1350 ℃, the calcining time is 60min, cooling the slag by adopting an air quenching and quenching way after discharging, separating and recovering metallic iron at the bottom and the side wall of the graphite crucible after cooling to room temperature, obtaining tempered steel slag after iron separation, crushing and grinding the tempered steel slag by a ball mill to obtain the tempered steel slag with the specific surface area of 430m 2 Perkg of quenched and tempered steel slag powder.
Example 11
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder and the reducing and tempering agent in the embodiment 5 according to the mass ratio of 85:15, uniformly mixing, placing the mixture in a graphite crucible to calcine in a high-temperature furnace, wherein the calcining temperature is 1350 ℃, the calcining time is 40min, cooling the molten slag by adopting an air quenching and quenching mode after discharging, separating and recovering metallic iron at the bottom and the side wall of the graphite crucible after cooling to room temperature, obtaining quenched and tempered steel slag after iron separation, and passing the quenched and tempered steel slag through a high-temperature furnace to calcine, wherein the calcining temperature is 1350 ℃, the calcining time is 40min, the quenching and tempering mode is adopted to cool the molten slag, the metallic iron at the bottom and the side wall of the graphite crucible can be separated and recovered after cooling to room temperature, the quenched and tempered steel slag after iron separation is obtainedCrushing and grinding by a ball mill to obtain the material with the specific surface area of 410m 2 Perkg of quenched and tempered steel slag powder.
Example 12
The embodiment provides a method for treating steel slag, which comprises the following steps:
mixing the steel slag powder and the reducing and tempering agent of the embodiment 6 according to a mass ratio of 82:18, uniformly mixing, placing the mixture in a graphite crucible to calcine in a high-temperature furnace, wherein the calcining temperature is 1350 ℃, the calcining time is 40min, cooling the slag by adopting an air quenching and quenching mode after discharging, separating and recovering metallic iron at the bottom and the side wall of the graphite crucible after cooling to room temperature, obtaining tempered steel slag after iron separation, crushing and grinding the tempered steel slag by a ball mill to obtain the tempered steel slag with the specific surface area of 420m 2 Perkg of quenched and tempered steel slag powder.
Test examples
The properties of the metallic iron and the quenched and tempered steel slag powder obtained by the processing in examples 7 to 12 were tested by the following specific operations:
(1) The determination method comprises the following steps:
the performance index test of the quenched and tempered steel slag powder refers to the steel slag powder used in cement and concrete in the national standard GB/T20491-2017;
(2) The test results are shown in table 2; wherein the comparative example is untreated steel slag powder;
TABLE 2 results of the tests of the properties of metallic iron and quenched and tempered steel slag powder obtained by the treatments in examples 7 to 12
Figure BDA0003405228800000091
As can be seen from Table 2, the steel slag and the reduction quenching and tempering agent are mixed to carry out chemical reaction at a lower temperature, the slag (i.e. calcined product) is discharged and quenched by air wind, the recovery rate of the separated and reduced metallic iron reaches more than 85 percent, and the effect of recovering the iron is remarkable; and the f-CaO content of the produced quenched and tempered steel slag is reduced to below 0.78% from 3.91%, the fluidity ratio of the quenched and tempered steel slag after grinding is more than 95%, the 7d activity index reaches 68-81%, the 28d activity index reaches 85-96%, and the activity index is obviously improved compared with that of the untreated steel slag powder. In conclusion, the reducing and tempering agent provided by the invention can reduce and recover valuable metal iron resources, and can obtain tempered steel slag with high gelling activity and no stability problem to be used as building material resources, so that the whole steel slag can be fully quantized without waste utilization, and the large-scale comprehensive utilization of the steel slag is facilitated to be improved.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. The reduction hardening and tempering agent is characterized by comprising the following components in percentage by mass: 35-90wt% of carbon-containing component, 2-40wt% of fluorite, 2-30wt% of desulfurized gypsum and 0-25wt% of barite; in the carbon-containing component, the fixed carbon is more than or equal to 40.0wt%, the volatile component is less than or equal to 50.0wt%, and the ash content is less than or equal to 10.0wt%.
2. The reductive tempering agent according to claim 1, wherein said carbon-containing component is pulverized coal and/or powdered carbon.
3. The reducing conditioner according to claim 1 or 2, wherein the specific surface area of the reducing conditioner is 200m 2 More than kg.
4. The reducing conditioner according to claim 3, wherein the specific surface area of the reducing conditioner is 280 to 320m 2 /kg。
5. Use of the reducing conditioner of any of claims 1-4 for treating steel slag.
6. The steel slag treating process features that steel slag is stoved and ground into specific surfaceProduct of 300m 2 Over/kg, and then mixing with the reducing conditioner according to any one of claims 1 to 3, and calcining.
7. The processing method according to claim 6, comprising:
step (1), drying the steel slag and then grinding the dried steel slag into powder until the specific surface area is 340-400m 2 Per kg, obtaining steel slag powder;
step (2), mixing the steel slag powder and the reduction hardening and tempering agent according to the mass ratio of (80-96): (4-20) mixing, and then calcining.
8. The process according to claim 7, characterized in that the calcination temperature is 1300-1400 ℃ and the calcination time is 30min or more.
9. The process according to claim 8, characterized in that the calcination temperature is 1325-1375 ℃ and the calcination time is 30-70min.
10. The processing method according to any one of claims 7 to 9, further comprising:
and (3) cooling the calcined product to room temperature, and separating to obtain metallic iron and quenched and tempered steel slag.
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