Indoor pollution control material based on steel slag as well as preparation method and application of indoor pollution control material

Abstract

The invention belongs to the technical field of indoor air pollution, and particularly discloses an indoor pollution control material based on steel slag and a preparation method and application thereof. According to the method, the steel slag is sequentially subjected to crushing, grinding, screening, magnetic separation iron removal and leaching, and the indoor pollution control material is obtained; a leaching solution adopted for leaching comprises one or more of acetic acid, sulfuric acid, cane sugar and ammonium chloride. Indoor formaldehyde treatment and large-scale utilization of the steel slag are organically combined together, formaldehyde treatment equipment does not need to be purchased independently, the treatment cost of the steel slag is greatly reduced, and meanwhile the additional value of the steel slag is improved. According to the scheme, the indoor harmful substance formaldehyde can be thoroughly removed and converted into carbon dioxide and water instead of being adsorbed and transferred, and pollutants are left. When the indoor pollution treatment material is used for treating indoor formaldehyde, the large specific surface area of the steel slag can be exerted to provide catalytic active sites for manganese oxide, efficient degradation of formaldehyde is achieved, and meanwhile a large amount of waste steel slag is consumed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of indoor air pollution, and particularly relates to an indoor pollution treatment material based on steel slag as well as a preparation method and application thereof. BACKGROUND

[0002] According to the survey results, the number of emergency treatments caused by indoor air pollution is very large every year, and the number of deaths caused by indoor pollution is also large every year. The total number of newly born children with congenital disabilities is high every year, of which 42.1% is related to indoor air pollution. Moreover, according to the survey, 90% of the children with leukemia admitted to a certain hospital had their families decorated within half a year. It is thus inferred that the harmful substances in indoor decoration materials may be an important inducement for childhood leukemia. Indoor air pollution has become an “invisible killer” threatening people's health. Therefore, it is of great significance to study how to reduce the concentration of indoor formaldehyde for improving indoor air quality and maintaining a healthy indoor environment, and it is particularly necessary and imminent in modern life.

[0003] A large amount of steel slag is discharged in the process of steel production. According to statistics, 0.15-0.2 tons of waste steel slag will be produced for every ton of crude steel. The accumulated steel slag cannot be utilized and is randomly piled up on empty land. At present, the comprehensive utilization rate of waste steel slag is only 30%, and the utilization rate is low.

[0004] Patent No. CN 207822734 U discloses a high-efficiency indoor formaldehyde treatment device, which removes formaldehyde by filtration and adsorption. Patent No. CN 117701791 A discloses a steel slag treatment system and process, which recycles and reuses the metals in the steel slag. Patent No. CN 105502673 A discloses a device for synchronous power generation and sewage purification using steel slag as an anode, which fills the steel slag electrode into the anode of a microbial fuel cell and couples it with a composite vertical flow constructed wetland. However, it can only be used for wastewater with low organic matter content and suitable for plant growth. Patent No. CN 106800332 A discloses a water treatment method using steel slag to catalyze ozone, which uses steel slag as an ozone catalyst to improve the utilization rate of ozone. Patent No. CN 101353201 A discloses a new method for wastewater treatment, which carbonizes steel slag and then uses it as a filler to increase the attachment area of microorganisms. These patent applications only involve the treatment of steel slag or the treatment of formaldehyde alone, and do not apply steel slag on a large scale to formaldehyde treatment to reduce indoor pollution.

[0005] Therefore, how to provide an indoor pollution treatment material based on steel slag as well as a preparation method and application thereof, establish the connection between steel slag and indoor pollution (formaldehyde), improve the utilization rate of steel slag, and provide a low-cost indoor pollution treatment material is a difficult problem to be solved in the field. SUMMARY

[0006] Therefore, the application provides a steel slag-based indoor pollution treatment material and a preparation method and application thereof, which can apply a large amount of existing steel slag to building materials and remove indoor formaldehyde.

[0007] In order to achieve the above purpose, the application adopts the following technical scheme:

[0008] A preparation method of a steel slag-based indoor pollution treatment material, comprising the following steps:

[0009] The steel slag is sequentially crushed, ground, screened, iron-removed by magnetic separation and leached to obtain the indoor pollution treatment material.

[0010] The leaching solution used in the leaching process comprises one or more of acetic acid, sulfuric acid, sucrose and ammonium chloride.

[0011] Preferably, the steel slag comprises steel slag produced by blast furnace iron smelting or steel slag produced in a manganese ore extraction process.

[0012] Preferably, the crushing comprises sequentially performing first crushing, second crushing and third crushing.

[0013] The particle size of the steel slag after the first crushing is 30-100 mm.

[0014] The particle size of the steel slag after the second crushing is ≤10 mm.

[0015] The particle size of the steel slag after the third crushing is 1-5 mm.

[0016] Preferably, the particle size after the grinding is 0.2-0.5 mm.

[0017] The screen hole particle size of the screening is 35-70 mesh, and the subsequent operation is performed after the screening.

[0018] The iron removal rate of the iron-removing by magnetic separation is 30-80%.

[0019] Preferably, the leaching time is 60-120 min; the leaching is performed under stirring, and the stirring rate is 300-600 rpm.

[0020] Preferably, the steel slag further comprises a pretreatment step.

[0021] The pretreatment step comprises sequentially performing a hot sweating process, water spraying cooling and natural stacking after the steel slag is discharged.

[0022] Preferably, the temperature of the heat leaching process is 800-900 DEG C, and the time of the heat leaching process is 8-12 hours.

[0023] The time of the natural stacking is 2-4 months.

[0024] Another object of the present application is to provide a steel slag-based indoor pollution treatment material prepared by the above preparation method.

[0025] Still another object of the present application is to provide an application of the steel slag-based indoor pollution treatment material as a formaldehyde adsorbent.

[0026] Still another object of the present application is to provide an application of the steel slag-based indoor pollution treatment material in concrete, wherein the steel slag-based indoor pollution treatment material is used to replace 1-40 wt.% of cement clinker.

[0027] The steel slag-based indoor pollution treatment material adsorbs and degrades formaldehyde in buildings, mainly because the specific surface area of the steel slag is relatively large, which can reach 100-300 m 2 / g, and the formaldehyde molecules in indoor air are quickly adsorbed by Van der Waals force to start the adsorption of formaldehyde. The surface of the steel slag is rich in hydroxyl (-OH) and oxygen vacancy defects, and the formaldehyde molecules are fixed on the active sites by hydrogen bonding or charge effect. The Mn3O4, MnO2 and other manganese-based active ingredients contained in the compounded steel slag first dehydrogenate HCHO to HCO, and then completely mineralize into water and carbon dioxide. The regeneration of the manganese-based active ingredients in the steel slag is the key factor for the continuous degradation of indoor formaldehyde. The regeneration of manganese-based oxides mainly refers to their ability to continuously degrade formaldehyde without losing activity. The oxygen adsorbed on the surface of the catalyst is activated into O 2- and O - by the vacancy, and then reacts with the oxygen ions and formaldehyde, and the water produced after the degradation of formaldehyde can produce new hydroxyl radicals on the catalyst. The components such as Fe2O3 and CaO existing in the steel slag can adjust the electronic structure of the catalyst and improve the redox capacity of the manganese-based active sites, and the principle is as shown in Figure 1 .

[0028] According to the above technical solution, compared with the prior art, the present application has the following beneficial effects:

[0029] 1. The present application combines indoor formaldehyde treatment with large-scale utilization of steel slag, and does not need to purchase formaldehyde treatment equipment separately, which greatly simplifies the cost of steel slag treatment and improves the added value of steel slag.

[0030] 2. The present application can completely remove and convert indoor hazards-formaldehyde into carbon dioxide and water, instead of adsorbing and transferring, leaving pollutants.

[0031] 3, Steel slag common processing method for hot splash, disk splash, hot stew, water quenching, wind quenching, mechanical force, slag disposal process, can be used. Through the present application, steel slag treatment and formaldehyde treatment can be combined together, which can eliminate indoor formaldehyde hazards and realize steel slag treatment.

[0032] 4, The indoor pollution treatment material of the present application can be used to treat indoor formaldehyde, which can provide catalytic active sites for manganese oxides with large specific surface area of steel slag, and realize efficient degradation of formaldehyde.

[0033] 5, Because the release process of formaldehyde after house decoration is slow, the building material mixed with the indoor pollution treatment material of the present application can be used for house to adsorb and degrade formaldehyde generated after indoor decoration at any time, which is permanent for indoor formaldehyde elimination, and completely solves the harm of indoor decoration formaldehyde. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0035] Figure 1 The principle diagram of the indoor pollution treatment material based on steel slag prepared in the present application. DETAILED DESCRIPTION

[0036] The present application provides a preparation method of an indoor pollution treatment material based on steel slag, comprising the following steps:

[0037] The steel slag is sequentially crushed, ground, screened, deironed by magnetic separation and leached to obtain the indoor pollution treatment material.

[0038] In the present application, the steel slag includes steel slag produced by blast furnace ironmaking or steel slag produced in the process of manganese ore extraction.

[0039] In the present application, the treated steel slag used in cement meets the requirements of "Steel Slag Powder for Use in Cement and Concrete" (GB / T 20491-2017), and the particle size is mainly distributed in 0.2-0.5mm.

[0040] In the present application, the crushing includes sequentially performed first crushing, second crushing and third crushing.

[0041] In the application, the particle size of the steel slag after the first crushing is 30-100mm, and can be specifically 40mm, 50mm, 60mm, 70mm, 80mm, 90mm; the particle size of the steel slag after the second crushing is ≤10mm, and can be specifically 1mm, 2mm, 4mm, 5mm, 6mm, 8mm; the particle size of the steel slag after the third crushing is 1-5mm, and can be specifically 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm.

[0042] In the application, the particle size after grinding is 0.2-0.5mm, and can be specifically 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm.

[0043] In the application, the screen mesh size of the screening is 35-70mesh, and can be specifically 40mesh, 45mesh, 50mesh, 55mesh, 60mesh, 65mesh, and the screened component is screened; the component not passing through the screen mesh is a screen residue.

[0044] The application can replace the sand, cement and gravel used in buildings with part of the steel slag, reduce the emission of carbon dioxide, and also be used for adsorbing and degrading indoor formaldehyde gas, so that the steel slag is fully utilized.

[0045] In the application, the iron removal rate of the magnetic separation is 30-80%, and can be specifically 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%. Too high iron content affects the strength of cement, and the recovered iron can be reused.

[0046] In the application, the leaching solution used for leaching includes one or more of acetic acid, sulfuric acid, sucrose and ammonium chloride; when the leaching solution contains acetic acid, the mass concentration of acetic acid is 10-35%, and can be specifically 15%, 20%, 25%, 30%; when the leaching solution contains sulfuric acid, the mass concentration of sulfuric acid is 1-4%, and can be specifically 1%, 2%, 3%, 3.5%; when the leaching solution contains sucrose, the mass concentration of sucrose is 10-55%, and can be specifically 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%; when the leaching solution contains ammonium chloride, the mass concentration of ammonium chloride is 5-55%, and can be specifically 10%, 12%, 30%, 40%, 50%.

[0047] In the application, the leaching time is 60-120 min, and specifically can be 70 min, 80 min, 90 min, 100 min, 110 min; the leaching is carried out under stirring, and the stirring rate is 300-600 rpm, and specifically can be 350 rpm, 400 rpm, 450 rpm, 500 rpm, 550 rpm.

[0048] In the application, the steel slag contains excessive active calcium oxide and active magnesium oxide, which cause volume expansion after meeting water, resulting in cracking of the hardened paste, especially when the active component accounts for a large proportion, the volume expansion of the active calcium oxide and magnesium oxide after meeting water causes the active calcium oxide and magnesium oxide to become calcium hydroxide and magnesium hydroxide, and the solid volume increases by 97% and 119%. The active components magnesium oxide and calcium oxide in the steel slag can be removed by leaching the steel slag with the leaching solution. The acidic environment accelerates the dissolution of the active components into soluble salts, and then the generated soluble salts are removed after washing. 50% sucrose or ammonium chloride is added as a complexing agent, sucrose can form a complex with calcium and magnesium ions to improve the dissolution efficiency; ammonium chloride can promote the dissolution of calcium oxide through ammonia coordination.

[0049] In the application, the steel slag further comprises a pretreatment step.

[0050] In the application, the pretreatment step is sequentially performing a hot sweating process, water spraying cooling and natural stacking after the steel slag is discharged.

[0051] In the application, the temperature of the hot sweating process is 800-900 DEG C, and specifically can be 820 DEG C, 840 DEG C, 850 DEG C, 860 DEG C, 880 DEG C; the time of the hot sweating process is 8-12 h, and specifically can be 8.5 h, 9 h, 9.5 h, 10 h, 10.5 h, 11 h, 11.5 h; the time of the natural stacking is 2-4 months, and specifically can be 2.2 months, 2.4 months, 2.5 months, 2.6 months, 2.8 months, 3 months, 3.2 months, 3.4 months, 3.5 months, 3.6 months, 3.8 months.

[0052] In the application, the preliminary slag-iron separation is realized by utilizing the difference in thermal expansion, after the hot sweating process, the steel slag is cooled to room temperature by spraying cold water in the hot sweating tank, which can reduce the content of free calcium oxide and magnesium oxide in the steel slag, and reduce the difficulty of subsequent treatment of free calcium oxide and magnesium oxide. The treated steel slag is naturally stacked, and the composition is further stabilized by air and water, and the content of free calcium oxide and magnesium oxide is reduced.

[0053] The application further provides an indoor pollution treatment material based on steel slag prepared by the above preparation method.

[0054] The application further provides an application of the indoor pollution treatment material based on steel slag as a formaldehyde adsorbent.

[0055] The application further provides application of the indoor pollution treatment material based on steel slag in concrete, and the indoor pollution treatment material based on steel slag is used to replace 1-40 wt.% of cement clinker.

[0056] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0057] Embodiment 1

[0058] The steel slag produced by blast furnace ironmaking is immediately transferred to a hot steaming tank, treated in a 850℃ residual heat environment for 10 hours, then cooled to room temperature by spraying cold water in the hot steaming tank, and the treated steel slag is naturally stacked for 3 months, further stabilizing its composition through air and water, to complete the pretreatment of the steel slag.

[0059] The jaw crusher is used for primary crushing, and the large particle iron after crushing is reused after sorting, and the remaining treated steel slag is crushed to 50-80mm for subsequent treatment. The steel slag after primary crushing is further crushed by a cone crusher or a vertical shaft impact crusher for secondary crushing, and the steel slag after secondary crushing has a diameter less than 10mm. The steel slag after secondary crushing is further crushed to 1-5mm by an impact sand making machine. The crushed steel slag is ground to a particle size of 0.2-0.4mm. The ground steel slag is screened by a screening machine, and the mesh number of the screening machine is controlled to be 40 meshes. The screened steel slag is reserved for standby, and the specific surface area of the screened steel slag is measured to be 400kg / m 3 The steel slag after crushing, grinding and screening is subjected to iron removal by a magnetic separation device, the temperature of the device is controlled to be 30℃, the processing capacity of the device per hour is 2 tons, and the removal rate of iron in the treated steel slag is 45%.

[0060] The steel slag after magnetic separation needs to be treated for the active components in the steel slag. The steel slag is leached by adding leaching liquid (30% acetic acid and 3.5% sulfuric acid by mass concentration) to remove the active components magnesium oxide and calcium oxide in the steel slag. The reaction is carried out in a stirred tank at room temperature, and the stirring rate is 300 revolutions per minute, and the reaction time is 60 minutes. After leaching treatment, the steel slag is washed with water, and after all the leaching liquid is washed out, it is dried to obtain an indoor pollution control material based on steel slag. The treated steel slag is used to prepare building materials, and the mixing ratio of high-strength concrete is usually cement: sand: stone = 1: 1.5: 3 (weight ratio), wherein the steel slag replaces 25% of the cement, and the water-cement ratio is not more than 0.35, wherein the soundness index of the sand should not be greater than 8%, and the clay content and mud content should not be greater than 2.0% and 0.5%, respectively.

[0061] The treated steel slag is used to replace 25% of the cement in the wall and floor of the house building room to form a complete and comprehensive formaldehyde removal structure. The initial indoor formaldehyde value is 40 mg / m 3 , and the indoor formaldehyde value after 7 days of treatment is 0.04 mg / m 3 ; under the same test conditions, the indoor formaldehyde value after 7 days of treatment without adding indoor pollution control material is 38 mg / m 3 .

[0062] Example 2

[0063] The steel slag produced by blast furnace ironmaking is immediately transferred to a hot steaming tank and treated in a residual heat environment at 820°C for 11 hours, and then cooled to room temperature by spraying cold water in the hot steaming tank. The treated steel slag is naturally stacked for 3.5 months, and further stabilized by air and water to complete the pretreatment of the steel slag.

[0064] A jaw crusher is used for primary crushing, and the large particle iron after crushing is reused after sorting. The remaining treated steel slag is crushed to 40-80 mm for subsequent treatment. The steel slag after primary crushing is further crushed by a cone crusher or a vertical shaft impact crusher for secondary crushing, and the diameter of the steel slag after secondary crushing is less than 9 mm. The steel slag after secondary crushing is further crushed to 1-5 mm by an impact sand making machine. The crushed steel slag is ground to a particle size of 0.2-0.4 mm. The ground steel slag is screened by a screening machine, and the mesh number of the screening machine is controlled to be 40 mesh. The screened steel slag is reserved for use, and the specific surface area of the steel slag is measured to be 500 kg / m 3 . The steel slag after crushing, grinding and screening is treated by a magnetic separation device to remove iron, and the temperature of the device is controlled to be 40°C. The processing capacity of the device is 3 tons per hour, and the removal rate of iron in the treated steel slag is 60%.

[0065] The steel slag after magnetic separation needs to be treated for the active components in the steel slag. The steel slag is leached by adding leaching liquid (30% acetic acid and 3.5% sulfuric acid by mass concentration) to remove the active components magnesium oxide and calcium oxide in the steel slag. The reaction is carried out in a stirred tank at room temperature, and the stirring rate is 400 revolutions per minute, and the reaction time is 80 minutes. After leaching treatment, the steel slag is washed with water, and after all the leaching liquid is washed out, it is dried to obtain an indoor pollution control material based on steel slag. The treated steel slag is used to prepare building materials, and the mixing ratio of high-strength concrete is usually cement: sand: stone = 1: 1.5: 3 (weight ratio), wherein the steel slag replaces 30% of the cement, and the water-cement ratio is not more than 0.35, wherein the soundness index of the sand should not be greater than 8%, and the clay content and mud content should not be greater than 2.0% and 0.5%, respectively.

[0066] In the completed building, the treated steel slag is replaced by 30% of the cement. By replacing part of the cement used in the indoor decoration process with steel slag, a complete and comprehensive formaldehyde removal structure is formed in the room, and the initial indoor formaldehyde value is 50mg / m 3 , and the indoor formaldehyde value is 0.03mg / m 3 after 7 days of treatment. Under the same test conditions, the room without placing the steel slag treatment material treated as described above has an indoor formaldehyde value of 48mg / m 3 after 7 days of treatment.

[0067] Example 3

[0068] The steel slag generated by the manganese-rich limonite is immediately transferred to a hot steaming tank after tapping, treated in a residual heat environment at 880°C for 11 hours, and then cooled to room temperature by spraying cold water in the hot steaming tank. The treated steel slag is naturally stacked for 3.8 months, and further stabilized by air and water to complete the pretreatment of the steel slag.

[0069] The primary crushing is carried out by using a jaw crusher, and the large particle iron after crushing is reused by sorting. The remaining treated steel slag is crushed to 30-60mm for subsequent treatment. The steel slag after primary crushing is further crushed by a cone crusher or a vertical shaft impact crusher, and the diameter of the steel slag after secondary crushing is less than 8mm. The steel slag after secondary crushing is further crushed to 1-5mm by using an impact sand making machine. The crushed steel slag is ground to a particle size of 0.2-0.4mm. The ground steel slag is screened by a screening machine, and the mesh number of the screening machine is controlled to be 40 meshes. The screened steel slag is reserved for use, and the specific surface area of the steel slag is measured to be 600kg / m 3 . The steel slag after crushing, grinding and screening is treated by a magnetic separation device to remove iron, and the temperature of the device is controlled to be 50°C. The processing capacity of the device is 4 tons per hour, and the removal rate of iron in the treated steel slag is 70%.

[0070] After magnetic separation to remove iron, the steel slag needs to be treated to remove its active components. A leaching experiment was conducted by adding 50% ammonium chloride to the leaching solution to remove the active components magnesium oxide and calcium oxide. The reaction was carried out at room temperature in a stirred tank at a stirring rate of 500 rpm for 120 minutes. After leaching, the steel slag was washed with water to remove all the leachate, and then dried to obtain an indoor pollution control material based on steel slag.

[0071] The indoor pollution control material obtained in this embodiment has a high specific surface area and a high content of manganese-based oxides. It can be encapsulated in non-woven fabric to form individual formaldehyde treatment packets, or granulated into 1-20 mesh particles, encapsulated on a honeycomb substrate, and covered with non-woven fabric for use as a commercial air purifier filter. Compared to traditional activated carbon filters, the filter prepared from manganese-rich limonite waste has a longer service life and can convert formaldehyde into non-toxic and harmless carbon dioxide and water. (At 120m...) 2 The area for placing the filter cartridge in the room is 2m². 2 The ventilation volume is 150m³. 3 / h, the initial indoor formaldehyde value was 60mg / m³ 3 After 7 days of treatment, the indoor formaldehyde level was 0.02 mg / m³. 3 Under the same testing conditions, in a room without the steel slag treatment materials described above, the indoor formaldehyde level was 57 mg / m³ after 7 days of treatment. 3 .

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing an indoor pollution control material based on steel slag, characterized in that, Includes the following steps: The steel slag is sequentially crushed, ground, screened, magnetically separated to remove iron, and leached to obtain indoor pollution treatment materials; The leaching solution used includes one or more of acetic acid, sulfuric acid, sucrose, and ammonium chloride.

2. The method for preparing an indoor pollution control material based on steel slag according to claim 1, characterized in that, The steel slag includes steel slag produced by blast furnace ironmaking or steel slag produced during manganese ore extraction.

3. A method for preparing an indoor pollution control material based on steel slag according to claim 1 or 2, characterized in that, The crushing process includes a first crushing, a second crushing, and a third crushing performed sequentially. The particle size of the steel slag after the first crushing is 30-100 mm; The particle size of the steel slag after the second crushing is ≤10mm; The particle size of the steel slag after the third crushing is 1-5 mm.

4. The method for preparing an indoor pollution control material based on steel slag according to claim 3, characterized in that, The particle size after grinding is 0.2–0.5 mm; The sieve aperture size of the sieve is 35-70 mesh, and the sieve sample is used for subsequent operations. The iron removal rate of the magnetic separation is 30-80%.

5. The method for preparing an indoor pollution control material based on steel slag according to claim 4, characterized in that, The leaching time is 60 to 120 minutes; the leaching is carried out under stirring conditions, and the stirring rate is 300 to 600 rpm.

6. A method for preparing an indoor pollution control material based on steel slag according to claim 4 or 5, characterized in that, The steel slag also includes a pretreatment step; The pretreatment steps are as follows: after the steel slag is tapped, it is sequentially subjected to hot quenching, water spraying cooling, and natural stacking.

7. The method for preparing an indoor pollution control material based on steel slag according to claim 6, characterized in that, The temperature of the hot-blanking process is 800-900℃, and the time of the hot-blanking process is 8-12 hours; The natural stacking period is from February to April.

8. The indoor pollution control material based on steel slag prepared by the preparation method according to any one of claims 1 to 7.

9. The application of the steel slag-based indoor pollution control material as described in claim 8 as a formaldehyde adsorbent.

10. The application of the steel slag-based indoor pollution control material according to claim 8 in concrete, characterized in that, The steel slag-based indoor pollution control material is used to replace 1-40 wt.% of cement clinker.

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