CN113880486B - Composite admixture utilizing solid wastes of iron and steel plant and preparation method thereof - Google Patents
Composite admixture utilizing solid wastes of iron and steel plant and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/149—Waste materials; Refuse from metallurgical processes other than silica fume or slag
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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
- 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 discloses a composite admixture utilizing solid wastes of an iron and steel plant, which comprises the following components in parts by weight: 80-90 parts of slag, 5-10 parts of steel slag, 3-9 parts of tower bottom ash, 1-5 parts of fly ash and 1-3 parts of chemical activating agent; the method comprises the following steps: respectively carrying out chemical component analysis on the slag, the steel slag, the fly ash and the tower bottom ash; the ingredients ensure the chemical composition of the mixture: siO 2 2 29％～34％、CaO 35％～40％、Al 2 O 3 10％～18％、Fe 2 O 3 1.5％～3％、SO 3 2.5-4 percent of the total weight of the coal, and the ignition loss is less than or equal to 2.5 percent; respectively crushing the slag and the steel slag, controlling the particle size to be less than 5mm, and then putting the crushed slag, the fly ash and tower bottom ash into a mill; adding chemical activator to grind for 30-40 min while grinding, and controlling the specific surface area to be more than or equal to 450m by a powder selector 2 And (Kg) obtaining the composite admixture.
Description
Technical Field
The invention belongs to the technical field of industrial waste residue resource utilization, and particularly relates to a composite admixture utilizing solid wastes of a steel plant and a preparation method thereof.
Background
In the process of steel production, steel plants generate a lot of solid wastes with low hydration activity besides slag, such as steel slag, furnace slag, tower bottom ash, low-grade fly ash, construction waste, iron tailings and the like.
The slag is melted in the iron-making processThe slag is discharged into water to be quenched to obtain byproducts with chemical components of CaO and SiO 2 、Al 2 O 3 And MgO component more than 80%, and small amount of Fe 2 O 3 、MnO 2 And TiO 2 The mineral composition is mainly silicate and aluminosilicate, and contains a large amount of substances with amorphous vitreous structures, and the mineral composition has high potential hydration activity. For years, the slag micro powder is used as a high-quality auxiliary cementing material for preparing cement and concrete due to the excellent characteristics of the slag micro powder, the demand of the slag micro powder is increased year by year along with the increase of the cement and concrete yield, the phenomenon of shortage of supply and demand even occurs in some regions, and the price of the slag micro powder in some regions is even comparable with that of the cement.
The steel slag is solid waste discharged in the steel-making process and is rich in C 3 S and C 2 S and other minerals are similar to industrial waste residue of the inferior portland cement clinker, but the mineral waste residue is poor in grindability and stability, and the resource utilization is difficult to realize on a large scale. The low-grade fly ash is fine ash captured from coal-fired flue gas, and mainly comprises SiO 2 、Al 2 O 3 、Fe 2 O 3 、Fe 2 O 3 、CaO、TiO 2 And the like, the particles are coarse, even a certain amount of unburned carbon powder is contained, and the hydration activity is poor. The tower bottom ash is solid powder generated by flue gas desulfurization, the components of the tower bottom ash are complex, most of the components are extremely unstable calcium sulfite, the comprehensive utilization is difficult, most of the components are used for stacking or landfill disposal, and secondary pollution is caused and a large amount of sulfur resources are lost. The hydration activity of the steel slag, the fly ash, the tower bottom ash and the like is very low compared with that of slag, the production added value is low, the treatment is difficult, and the burden which troubles the development of the major industry of steel enterprises is gradually formed.
Under the background condition, the method combines the practical situation of steel enterprises, compounds the easily obtained solid wastes (such as steel slag, furnace slag, tower bottom ash, low-grade fly ash, construction waste, iron tailings, stone chips and the like) with the slag to prepare the economical composite admixture, replaces S95 slag micro powder, can relieve the problem of mineral powder supply shortage to a certain extent, can improve the comprehensive utilization rate of the solid wastes, reduce environmental pollution, change wastes into valuables, improves the economic value of the slag, saves social resources and has huge economic benefit and environmental benefit.
The patent CN 112358215A provides a multi-solid waste cement coupling admixture and a preparation method thereof, although the preparation method also adopts a chemical activation mode, the preparation method needs a thermal activation process, and the production process is complex, the energy consumption is high, and the preparation cost is high. The patent "a steel slag powder-ferromanganese slag powder composite admixture and preparation technology thereof" (CN 111302691A) provides a steel slag powder-ferromanganese slag powder composite admixture and a preparation technology thereof, the preparation technology is that steel slag and ferromanganese slag are respectively ground to certain fineness, the grinding equipment investment of the technology is large, the production efficiency is not high, and the obtained composite admixture meets the standard of GB/T20491-2017 steel slag powder used in cement and concrete, the activity is low, and the application is limited; in addition, the steel slag content is too high, and the risk of poor volume stability of the product at the later stage exists.
Disclosure of Invention
The invention aims to provide an economical composite admixture prepared by utilizing solid wastes of a steel plant and a production method thereof. The composite admixture mainly adopts solid wastes in the production process of steel enterprises, can recycle the solid wastes such as steel slag, low-grade fly ash, tower bottom ash and the like, increases the supply of mineral powder, reduces the production cost of the mineral powder, is favorable for smoothing the relationship between main products and byproduct wastes in the production process of steel, and promotes the development of major industry.
In order to achieve the purpose, the technical scheme is as follows:
the composite admixture utilizing the solid wastes of the iron and steel plant comprises the following components in parts by weight:
80-90 parts of slag, 5-10 parts of steel slag, 3-9 parts of tower bottom ash, 1-5 parts of fly ash and 1-3 parts of chemical activating agent; the slag, the steel slag, the tower bottom ash and the fly ash are all from solid waste of a steel plant.
According to the scheme, the mixture composed of the slag, the steel slag, the tower bottom ash and the fly ash comprises the following components in percentage by weight:
SiO 2 29％～34％、CaO 35％～40％、Al 2 O 3 10％～18％、Fe 2 O 3 1.5％～3％、SO 3 2.5-4 percent and the ignition loss is less than or equal to 2.5 percent.
According to the scheme, the slag comprises the following components in percentage by weight: siO 2 2 30％～35％、CaO 35％～40％、Al 2 O 3 8％～20％、Fe 2 O 3 0.1％～2％、MgO 6％～12％、SO 3 2 to 5 percent, and the activity requirement of the national standard above S95 level is met after the powder is ground.
According to the scheme, the steel slag comprises the following components in percentage by weight: siO 2 2 15％～25％、CaO 30％～40％、Al 2 O 3 3％～8％、Fe 2 O 3 10％～25％、MgO 10％～15％、SO 3 0.2-2% and the ignition loss is less than or equal to 8%.
According to the scheme, the fly ash comprises the following components in percentage by weight: siO 2 2 40％～55％、CaO 5％～10％、Al 2 O 3 25％～40％、Fe 2 O 3 2％～10％、SO 3 2-5 percent and the ignition loss is less than or equal to 10 percent.
According to the scheme, the tower bottom ash comprises the following components in percentage by weight: siO 2 2 3％～5％、CaO 25％～40％、Al 2 O 3 0％～3％、Fe 2 O 3 3％～10％、SO 3 15-25 percent and the ignition loss is less than or equal to 30 percent.
According to the scheme, the chemical activator is prepared from anhydrous sodium sulphate: ammonium alum: isopropanolamine: ester quaternary ammonium salt: the modified polyol is prepared from the following components in percentage by mass (4-8): (2-6): (0.1-0.5): (0.2-0.6): (0.1-0.3), wherein the modified polyol is prepared by mixing ethylene glycol: diethylene glycol: pentaerythritol: glycerol is prepared from the following raw materials in percentage by mass (1-3): (2-4): (1-2): (3-6) mixing.
The preparation method of the composite admixture by utilizing the solid wastes of the steel plant comprises the following steps:
respectively carrying out chemical component analysis on the slag, the steel slag, the fly ash and the tower bottom ash;
the ingredients ensure the chemical composition of the mixture: siO 2 2 29％～34％、CaO 35％～40％、Al 2 O 3 10％～18％、Fe 2 O 3 1.5％～3％、SO 3 2.5 to 4 percent, and the ignition loss is less than or equal to 2.5 percent;
respectively crushing the slag and the steel slag, controlling the particle size to be less than 5mm, and then putting the crushed slag, the fly ash and tower bottom ash into a mill;
adding chemical activator to grind for 30-40 min while grinding, and controlling the specific surface area to be more than or equal to 450m by a powder selector 2 And (Kg) obtaining the composite admixture.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the economical composite admixture prepared by utilizing the solid wastes of the steel plant takes the solid wastes of the steel plant, such as slag, steel slag, fly ash, tower bottom ash and the like as main production raw materials, can consume a large amount of solid wastes, comprises the steel slag, the tower bottom ash and the like with low hydration activity which are difficult to treat, and can reduce the production cost of slag powder and increase the supply of S95 slag powder.
The invention designs reasonable raw material composition of the composite admixture based on chemical components of all raw materials, firstly ensures that the activity of slag is not lower than S95 level, and simultaneously adopts the means of physical mechanical grinding control fineness, sulfate excitation of tower bottom ash, alkali excitation of chemical activating agent and the like to improve the hydration activity of the admixture, thereby not only avoiding the waste of 'activity' of high-activity slag powder, but also improving the utilization value of low-activity solid waste.
Drawings
FIG. 1 is the XRD pattern of the 7d hydration product corresponding to neat paste of example 2 of the present invention;
FIG. 2 is an XRD pattern of a 28d hydration product corresponding to neat slurry in example 2 of the present invention;
FIG. 3 is an SEM photograph of a hydration product of neat slurry 7d according to example 2 of the invention;
FIG. 4 is an SEM image of a hydrated product of neat paste 28d according to example 2 of the present invention.
Detailed Description
The following examples further illustrate the technical solutions of the present invention, but should not be construed as limiting the scope of the present invention.
The invention prepares the economical composite admixture which meets the requirements of national standard S95 slag powder by compounding high-activity slag and low-activity solid waste of a steel plant and utilizing the means of mechanical grinding activation, inter-component synergistic excitation, additional activator excitation and the like.
The slag, the steel slag, the tower bottom ash and the fly ash adopted in the concrete embodiment are all from solid wastes of a steel plant, and the components in parts by weight are as follows: 80-90 parts of slag, 5-10 parts of steel slag, 3-9 parts of tower bottom ash, 1-5 parts of fly ash and 1-3 parts of chemical activating agent.
Wherein, the slag comprises the following components in percentage by weight: siO 2 2 30％～35％、CaO 35％～40％、Al 2 O 3 8％～20％、Fe 2 O 3 0.1％～2％、MgO 6％～12％、SO 3 2-5 percent, and reaches the activity requirement of more than S95 level in the national standard after being ground.
The steel slag comprises the following components in percentage by weight: siO 2 2 15％～25％、CaO 30％～40％、Al 2 O 3 3％～8％、Fe 2 O 3 10％～25％、MgO 10％～15％、SO 3 0.2-2% and the loss on ignition is less than or equal to 8%.
The fly ash comprises the following components in percentage by weight: siO 2 2 40％～55％、CaO 5％～10％、Al 2 O 3 25％～40％、Fe 2 O 3 2％～10％、SO 3 2-5 percent and the ignition loss is less than or equal to 10 percent.
The tower bottom ash comprises the following components in percentage by weight: siO 2 2 3％～5％、CaO 25％～40％、Al 2 O 3 0％～3％、Fe 2 O 3 3％～10％、SO 3 15-25 percent and the ignition loss is less than or equal to 30 percent.
The chemical activator is prepared from sodium sulfate: ammonium alum: isopropanolamine: ester quaternary ammonium salt: the modified polyol is prepared from the following components in percentage by mass (4-8): (2-6): (0.1-0.5): (0.2-0.6): (0.1-0.3), wherein the modified polyol is prepared by mixing ethylene glycol: diethylene glycol: pentaerythritol: glycerol is prepared from the following raw materials in percentage by mass (1-3): (2-4): (1-2): (3-6) mixing.
The preparation process of the composite admixture of the invention is as follows:
respectively carrying out chemical component analysis on the slag, the steel slag, the fly ash and the tower bottom ash;
the ingredients ensure the chemical composition of the mixture: siO 2 2 29％～34％、CaO 35％～40％、Al 2 O 3 10％～18％、Fe 2 O 3 1.5％～3％、SO 3 2.5 to 4 percent, and the ignition loss is less than or equal to 2.5 percent;
crushing the slag and the steel slag respectively, controlling the particle size to be less than 5mm, and putting the crushed slag, the fly ash and tower bottom ash into a mill;
while grinding, adding a chemical activator to grind for 30-40 min, and controlling the specific surface area to be more than or equal to 450m by a powder selector 2 And (Kg) obtaining the composite admixture.
Table 1 shows the parts by weight of each solid waste of the composite admixtures obtained in examples 1, 2 and 3.
TABLE 1
| Examples | Slag of mine | Steel slag | Fly ash | Tower bottom ash | Activating agent |
| Example 1 | 80.0 | 9.0 | 3.0 | 6.0 | 2.0 |
| Example 2 | 84.0 | 7.0 | 3.0 | 5.0 | 1.0 |
| Example 3 | 85.0 | 8.0 | 1.0 | 4.5 | 1.5 |
The compound admixtures corresponding to the examples in table 1 and the mixture of cement were mixed with standard sand in the weight ratio of 1. For comparison, a reference group S using pure ordinary silica cement as a binding material, and a control group S0 using 50% ordinary silica cement and 50% slag powder as a binding material were prepared at the same time. Table 2 reflects that the strength of the composite admixtures of examples S1-S3 mostly exceeds that of the reference group S, and S1-S3 exceed that of the control group S0.
Table 2 test results of mortar strength for each example, reference group and control group
The data results in table 2 are shown in table 3, after being processed according to the activity calculation method in the standard GB/T18046-2017 granulated blast furnace slag powder for cement and concrete. It can be seen that the activity indexes of 7d and 28d of the examples S1 to S3 satisfy the technical requirement of S95 in the GB/T18046-2017 granulated blast furnace slag powder used in cement and concrete standard, compared with the S0 group and the S group of cement mortar using pure ordinary silica cement and S95 slag powder.
TABLE 3 test results of Activity indexes of examples, reference group, and control group
Meanwhile, selecting the example 2 in the table 1, preparing a pure slurry test block according to GB/T1346-2011 Standard test method for water consumption, setting time and stability of standard consistency of cement, preparing a sample after standard maintenance for 7d and 28d, and respectively measuring phases of hydration products of different ages by an XRD diffractometer, wherein the phases are shown in the figure 1 and the figure 2; the microscopic appearances of the fresh sections of the samples of different hydration ages are respectively observed by a Scanning Electron Microscope (SEM) in a vacuum mode, and are shown in figures 3 and 4.
Referring to FIGS. 1 and 3, it can be seen that the 7d hydration products of example 2 corresponding to neat paste are mainly acicular ettringite, flocculent C-S-H gel and flaky Ca (OH) 2 . Besides the hydration reaction of ordinary cement, the chemical activator is alkaline, which can make OH - The concentration is increased to precipitate crystals, and the crystals react with active silicon oxide, aluminum oxide and sulfate ions in the mineral admixture to generate ettringite, C-S-H gel and the like (namely alkali excitation). As the hydration reaction proceeds, substantially no Ca (OH) flakes are visible in the hydration product of sample 28d, as shown in FIGS. 2 and 4 2 However, ettringite and C-S-H gel are increased significantly. This is because as the hydration reaction continues, the potential activity of the mineral admixture is slowly activated, the amount of calcium hydroxide is continuously consumed, and the systemThe ettringite is used as a framework, and C-S-H gel and other hydration products are filled in the framework and the pores, so that the structure is more compact, and the macroscopic appearance is that the mechanical property is obviously improved.
The cost of producing the composite admixture using examples 1-3 and its comparison with the cost of S95 pure slag powder based on the current raw material price are shown in table 4. The price of each raw material at present is respectively: the slag is 230 yuan/t, the steel slag is 25 yuan/t, the tower bottom ash is 25 yuan/t, the fly ash is 100 yuan/t, the activating agent is 1200 yuan/t, the formula cost of each embodiment is respectively that S1 is 214.75 yuan/t, S2 is 217.75 yuan/t, S3 is 218.93 yuan/t, the formula cost is respectively reduced by 15.25 yuan/t, 12.25 yuan/t and 11.07 yuan/t compared with that of S95 slag powder, the production cost is reduced, low-activity solid waste is consumed, the slag powder yield is improved, and the economic effect is obvious.
TABLE 4 formulation costs for examples 1-3 corresponding to composite admixtures
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (5)
1. The composite admixture utilizing the solid wastes of the steel plant is characterized by comprising the following components in parts by weight:
80-90 parts of slag, 5-10 parts of steel slag, 3-9 parts of tower bottom ash, 1-5 parts of fly ash and 1-3 parts of chemical activating agent; the slag, the steel slag, the tower bottom ash and the fly ash are all from solid waste of a steel plant; the chemical activator is prepared from sodium sulfate: ammonium alum: isopropanolamine: ester quaternary ammonium salt: the modified polyol is prepared from the following components in percentage by mass (4-8): (2-6): (0.1-0.5): (0.2-0.6): (0.1-0.3), wherein the modified polyol is prepared by mixing ethylene glycol: diethylene glycol: pentaerythritol: glycerol is prepared from the following raw materials in percentage by mass (1-3): (2-4): (1-2): (3-6) mixing;
the composite admixture is prepared by the following method:
respectively carrying out chemical component analysis on the slag, the steel slag, the fly ash and the tower bottom ash;
the ingredients ensure the chemical composition of the mixture: siO 2 2 29％～34％、CaO 35％～40％、Al 2 O 3 10％～18％、Fe 2 O 3 1.5％～3％、SO 3 2.5-4 percent of the total weight of the coal, and the ignition loss is less than or equal to 2.5 percent;
crushing the slag and the steel slag respectively, controlling the particle size to be less than 5mm, and putting the crushed slag, the fly ash and tower bottom ash into a mill;
while grinding, adding a chemical activator to grind for 30-40 min, and controlling the specific surface area to be more than or equal to 450m by a powder selector 2 and/Kg, obtaining the composite admixture.
2. The admixture for compounding solid wastes of iron and steel works as claimed in claim 1, wherein said slag comprises the following components in weight percent: siO 2 2 30％～35％、CaO 35％～40％、Al 2 O 3 8％～20％、Fe 2 O 3 0.1％～2％、MgO 6％～12％、SO 3 2 to 5 percent, and the activity requirement of the national standard above S95 level is met after the powder is ground.
3. The composite admixture for utilizing solid wastes of a steel and iron plant as defined in claim 1, wherein said steel slag comprises the following components in percentage by weight: siO 2 2 15％～25％、CaO 30％～40％、Al 2 O 3 3％～8％、Fe 2 O 3 10％～25％、MgO 10％～15％、SO 3 0.2-2% and the ignition loss is less than or equal to 8%.
4. The admixture for compounding solid wastes of iron and steel works as defined in claim 1, wherein said fly ash comprises the following components in percentage by weight: siO 2 2 40％～55％、CaO 5％～10％、Al 2 O 3 25％～40％、Fe 2 O 3 2％～10％、SO 3 2-5 percent and the ignition loss is less than or equal to 10 percent.
5. The admixture for compounding solid wastes of steel and iron works as defined in claim 1 wherein said tower bottom ash comprises the following components in weight percent: siO 2 2 3％～5％、CaO 25％～40％、Al 2 O 3 0％～3％、Fe 2 O 3 3％～10％、SO 3 15-25 percent and the ignition loss is less than or equal to 30 percent.
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| CN104446022A (en) * | 2014-12-18 | 2015-03-25 | 长沙紫宸科技开发有限公司 | Method for preparing steel slag sand, activated slag powder and RO phase from steel slag |
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