阅读说明：本技术 一种基于钢渣活化技术的超高比表面积钢渣粉生产工艺 (Steel slag activation technology-based steel slag powder production process with ultrahigh specific surface area ) 是由 杨亮 于 2021-05-10 设计创作，主要内容包括：本发明涉及一种基于钢渣活化技术的超高比表面积钢渣粉生产工艺,其特征在于：具体生产工艺如下：S1：钢渣尾渣的筛选；S2：钢渣颗粒II的预处理；S3：钢渣颗粒II的活化；S4：钢渣颗粒的研磨；本发明中通过色选的方式对钢渣进行筛选,首先得到富铁的钢渣,通过对富铁钢渣进行加入脱硫石膏和木钙进行机械力活化,避免直接在钢渣中加入脱硫石膏和木钙,减少了脱硫石膏和木钙的使用,节约了成本；活化后的富铁钢渣与剩余的钢渣颗粒按照比例混合进行研磨,这种方式降低了研磨能耗,也节约了活化材料的使用；克服了由于钢渣中铁含量的差异导致不同批次的钢渣粉活性差异大的缺点。(The invention relates to a steel slag activation technology-based steel slag powder production process with an ultrahigh specific surface area, which is characterized by comprising the following steps of: the specific production process comprises the following steps: s1: screening steel slag tailings; s2: pretreating steel slag particles II; s3: activating steel slag particles II; s4: grinding steel slag particles; according to the invention, the steel slag is screened in a color selection mode, the iron-rich steel slag is obtained firstly, and the desulfurized gypsum and the calcium carbonate are added into the iron-rich steel slag for mechanical force activation, so that the desulfurized gypsum and the calcium carbonate are prevented from being directly added into the steel slag, the use of the desulfurized gypsum and the calcium carbonate is reduced, and the cost is saved; the activated iron-rich steel slag and the residual steel slag particles are mixed according to the proportion and ground, so that the grinding energy consumption is reduced, and the use of an activating material is saved; overcomes the defect of large activity difference of the steel slag powder of different batches caused by the difference of the iron content in the steel slag.)

1. A production process of steel slag powder with ultra-high specific surface area based on a steel slag activation technology is characterized in that: the specific production process comprises the following steps:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm; carrying out primary color separation on the steel slag particles I according to the optical characteristics of iron elements in the steel slag to obtain steel slag particles II enriched with the iron elements and steel slag particles III containing trace iron elements;

s2: pretreatment of steel slag particles II: adding the steel slag particles II, the desulfurized gypsum and the calcium carbonate into water according to the proportion, mixing, stirring for 3-5min to form a flowing slurry, and drying the mixed slurry at the temperature of 30-40 ℃ for 12-24 hours;

s3: activation of steel slag particles II: mixing the pretreated steel slag particles II with electric furnace reducing slag and plastic-retaining thickening starch, heating to 850-900 ℃, and preserving heat for 5-6 hours;

s4: grinding steel slag particles: cooling the activated steel slag particles II to room temperature, and selecting unactivated steel slag particles III and activated steel slag particles II; mixing the steel slag particles II and the steel slag particles III according to the mass ratio of 4-5:10, and then feeding the mixture into a vertical mill to be verticalGrinding, controlling the pressure of grinding roller of vertical mill at 12-13MPa, the temperature of hot air entering the vertical mill at 250-300 deg.C, and the air quantity at 20 × 104-21 × 104m³The temperature of the hot air out of the vertical mill is 85-90 ℃, the rotating speed of a powder concentrator of the vertical mill is 110-130r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²The product is obtained after Kg.

2. The process for producing the steel slag powder with the ultrahigh specific surface area based on the steel slag activation technology as claimed in claim 1, is characterized in that: the mass percentage of the steel slag particles II, the desulfurized gypsum and the wood calcium in the S2 is 30-40 percent, 40-60 percent and 10-30 percent.

3. The process for producing the steel slag powder with the ultrahigh specific surface area based on the steel slag activation technology as claimed in claim 1, is characterized in that: the desulfurization gypsum in the S2 comprises the following chemical components in percentage by weight: 35.92% of CaO, 1.47% of MgO and Fe₂O₃0.05%、Al₂O₃ 0.88%、SiO₂ 6.83%、SO₃46.09% and 8.75% of impurities.

4. The process for producing the steel slag powder with the ultrahigh specific surface area based on the steel slag activation technology as claimed in claim 1, is characterized in that: the weight percentage of the chemical components of the steel slag particles II in the S1 is as follows: CaO 18.91%, MgO6.61%, Fe₂O₃35.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities; the S1 steel slag particles III comprise the following chemical components in percentage by weight: CaO 38.91%, MgO6.61%, Fe₂O₃ 15.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities.

5. The process for producing the steel slag powder with the ultrahigh specific surface area based on the steel slag activation technology as claimed in claim 1, is characterized in that: 75-85 parts of steel slag particles II in S2, 20-30 parts of electric furnace reducing slag and 2-3 parts of plastic-retaining thickening starch.

6. A method according to claim 1 based onThe production process of the steel slag powder with the ultrahigh specific surface area by the steel slag activation technology is characterized by comprising the following steps of: the weight percentage of the main chemical component of the electric furnace slag in the S2 is SiO₂ 22.7%、FeO 1.7%、Al₂O₃5.6%、CaO 61.7%、MgO 8.3%。

7. The process for producing the steel slag powder with the ultrahigh specific surface area based on the steel slag activation technology as claimed in claim 1, is characterized in that: in the S4, in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and horizontal direction vibration amplitudes of the grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction vibration amplitude is larger than 2.5mm and the horizontal direction vibration amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 0.5-2m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, and if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, wherein the water spraying amount is 0.5-2m³H until the temperature is < 300 ℃.

Technical Field

The invention relates to the technical field of steel slag powder production with ultrahigh specific surface area, in particular to a steel slag activation technology-based steel slag powder production process with ultrahigh specific surface area.

Background

The main chemical components of the steel slag are CaO and SiO₂、Fe₂0₃、Al₂O₃、MgO、P₂0₅And MnO, in which tricalcium silicate and dicalcium silicate have similar components to those of cement clinker, and CaO content is higher, and its basicity coefficient is generally above 2.0, so that it is a good latent hydraulic material, and it should be identical to flyash, slag and zeolite powderThe concrete admixture can be used as an admixture of concrete after being ground, so that a series of performances of the concrete are improved.

The specific surface area of the steel slag tailings ground by the existing vertical grinding machine is a main parameter for embodying the performance of the steel slag tailings ground by the existing vertical grinding machine, and relates to unit water consumption, concrete corrosion resistance, hydration heat-evolution speed, later strength of the concrete and the like in the concrete manufacturing process, while the specific surface area of the steel slag powder ground by the existing vertical grinding machine is 420-480 m-²About/kg, the specific surface area has a larger lifting space, and the steel slag powder with high specific surface area directly ground by a vertical grinding machine has high energy consumption and poor feasibility, so the research and development of the production method of the superfine steel slag micro powder with high specific surface area and low energy consumption is imperative.

The energy consumption difference generated by grinding the iron-rich steel slag and the steel slag with lower iron content by using a vertical mill is large, mainly because the iron element in the iron-rich steel slag forms a hard crystalline structure in the steel slag, the hardness of the steel slag is greatly increased; the desulfurized gypsum and the wood calcium are commonly added into the steel slag to enhance the activity of the steel slag, and the aim is to increase the activity of the iron-rich steel slag to reduce the energy consumption of grinding.

The preparation method of the activated steel powder disclosed in the Chinese patent 201410124910.0 is characterized by comprising the following steps: the method comprises the following steps: pretreatment: adding the steel slag, the desulfurized gypsum and the wood calcium into water according to a certain proportion, mixing, stirring for 3-5min to form a flowing slurry, and drying the mixed slurry at the temperature of 30-40 ℃ for 12-24 hours; steel slag activation: mixing the pretreated steel slag, electric furnace reducing slag and plastic-retaining thickening starch, heating to 850-900 ℃, and preserving heat for 5-6 hours; grinding steel powder: and cooling the activated steel powder to room temperature, putting the steel powder into a high-energy ball mill for ball milling for 5-6 hours at a ball-to-material ratio of 5-5.5: 1 until the fineness of the steel powder reaches 480-500 m2/kg, and obtaining a finished product.

In the above patent, when the activated steel powder is produced, the desulfurized gypsum and the calcium lignosulfonate are directly added into the steel slag to activate the steel slag, and this way needs to consume a large amount of desulfurized gypsum and calcium lignosulfonate, so that the energy consumption in unit time is relatively high, and the production cost is high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a steel slag powder production process with an ultrahigh specific surface area based on a steel slag activation technology, which can solve the problems of high grinding energy consumption, poor abrasion resistance and high production cost of the common steel slag powder with the ultrahigh specific surface area produced by using steel slag.

In order to solve the technical problems, the technical scheme of the invention is as follows: a production process of steel slag powder with ultra-high specific surface area based on a steel slag activation technology is characterized by comprising the following innovation points: the specific production process comprises the following steps:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm; carrying out primary color separation on the steel slag particles I according to the optical characteristics of iron elements in the steel slag to obtain steel slag particles II enriched with the iron elements and steel slag particles III containing trace iron elements;

s2: pretreatment of steel slag particles II: adding the steel slag particles II, the desulfurized gypsum and the calcium carbonate into water according to the proportion, mixing, stirring for 3-5min to form a flowing slurry, and drying the mixed slurry at the temperature of 30-40 ℃ for 12-24 hours;

s3: activation of steel slag particles II: mixing the pretreated steel slag particles II with electric furnace reducing slag and plastic-retaining thickening starch, heating to 850-900 ℃, and preserving heat for 5-6 hours;

s4: grinding steel slag particles: cooling the activated steel slag particles II to room temperature, and selecting unactivated steel slag particles III and activated steel slag particles II; mixing the steel slag particles II and the steel slag particles III according to the mass ratio of 4-5:10, then feeding the mixture into a vertical mill for direct grinding, controlling the pressure of a grinding roller of the vertical mill to be 12-13MPa, the temperature of hot air fed into the vertical mill to be 250-300 ℃, and the air volume to be 20 x 104-21 x 104m³The temperature of the hot air out of the vertical mill is 85-90 ℃, the rotating speed of a powder concentrator of the vertical mill is 110-130r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²Obtaining a finished product after Kg;

further, the mass percentage of the steel slag particles II, the desulfurized gypsum and the wood calcium in the S2 is 30-40 percent, 40-60 percent and 10-30 percent.

Further, the step S2The weight percentage of the chemical components of the medium desulfurized gypsum is as follows: 35.92% of CaO, 1.47% of MgO and Fe₂O₃ 0.05%、Al₂O₃ 0.88%、SiO₂ 6.83%、SO₃46.09% and 8.75% of impurities.

Further, the chemical components of the steel slag particles II in the S1 are as follows by weight percent: CaO 18.91%, MgO6.61%, Fe₂O₃ 35.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities; the S1 steel slag particles III comprise the following chemical components in percentage by weight: CaO 38.91%, MgO6.61%, Fe₂O₃ 15.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities.

Further, 75-85 parts of steel slag particles II in S2, 20-30 parts of electric furnace reducing slag and 2-3 parts of plastic-retaining thickening starch.

Further, the weight percentage of the main chemical component of the electric furnace slag in the S2 is SiO₂ 22.7%、FeO 1.7%、Al₂O₃ 5.6%、CaO 61.7%、MgO 8.3%。

Further, in the S4, in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and the horizontal direction of the grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction amplitude is larger than 2.5mm and the horizontal direction amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 0.5-2m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, and if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, wherein the water spraying amount is 0.5-2m³H until the temperature is < 300 ℃.

The invention has the advantages that:

1) according to the invention, the steel slag is screened in a color selection mode, the iron-rich steel slag is obtained firstly, and the desulfurized gypsum and the calcium carbonate are added into the iron-rich steel slag for mechanical force activation, so that the desulfurized gypsum and the calcium carbonate are prevented from being directly added into the steel slag, the use of the desulfurized gypsum and the calcium carbonate is reduced, and the cost is saved; the activated iron-rich steel slag and the rest steel slag particles are mixed according to a proportion and ground, so that the steel slag particles become small, the specific surface area is increased, part of powder energy is converted into internal energy and surface energy of new particles, and meanwhile, an amorphous structure which is easy to dissolve in water is formed on the particle surface, so that the activity of the steel slag is improved;

2) according to the invention, the iron-rich steel slag is screened out firstly for activation and then is mixed and ground with the residual steel slag in proportion, so that the grinding energy consumption is reduced, and the use of an activating material is saved; overcomes the defect of large activity difference of the steel slag powder of different batches caused by the difference of the iron content in the steel slag.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic flow chart of the production process of steel slag powder with ultra-high specific surface area based on steel slag activation technology.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention adopts the following auxiliary materials in terms of chemical components:

the desulfurization gypsum comprises the following chemical components in percentage by weight: 35.92% of CaO, 1.47% of MgO and Fe₂O₃ 0.05%、Al₂O₃ 0.88%、SiO₂ 6.83%、SO₃46.09% and 8.75% of impurities.

The steel slag particle II comprises the following chemical components in percentage by weight: CaO 18.91%, MgO6.61%, Fe₂O₃ 35.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities;

steel slagThe particle III comprises the following chemical components in percentage by weight: CaO 38.91%, MgO6.61%, Fe₂O₃ 15.11%、Al₂O₃ 1.57%、SiO₂13.32 percent and 1.2 percent of impurities.

The weight percentage of the main chemical component of the electric furnace slag is SiO₂ 22.7%、FeO 1.7%、Al₂O₃ 5.6%、CaO 61.7%、MgO 8.3%。

Example 1: a production process of steel slag powder with an ultrahigh specific surface area based on a steel slag activation technology comprises the following specific production processes:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm;

s2: grinding steel slag particles: directly grinding steel slag particles I in a vertical grinding machine, controlling the pressure of a grinding roller of the vertical grinding machine to be 12MPa, controlling the temperature of hot air entering the vertical grinding machine to be 250 ℃, and controlling the air quantity to be 20 multiplied by 104m³The temperature of the hot air discharged from the vertical mill is 85 ℃, the rotating speed of a powder concentrator of the vertical mill is 110r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²Obtaining a finished product after Kg; in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and horizontal direction vibration amplitudes of a grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction vibration amplitude is larger than 2.5mm and the horizontal direction vibration amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 1.5m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, and the water spraying amount is 1.5m³H until the temperature is < 300 ℃.

Example 2: a production process of steel slag powder with an ultrahigh specific surface area based on a steel slag activation technology comprises the following specific production processes:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm;

s2: pretreatment of steel slag particles I: mixing the steel slag particles I, the desulfurized gypsum and the wood calcium according to the proportion of 35 percent to 55 percent to 15 percent; adding water, mixing, stirring for 4min to obtain fluid slurry, and drying the mixed slurry at 35 deg.C for 18 hr;

s3: activation of steel slag particles I: mixing the pretreated steel slag particles II with electric furnace reducing slag and plastic-retaining thickening starch, heating to 850 ℃, and preserving heat for 5 hours;

s4: grinding steel slag particles: directly grinding steel slag particles I in a vertical grinding machine, controlling the pressure of a grinding roller of the vertical grinding machine to be 12MPa, controlling the temperature of hot air entering the vertical grinding machine to be 250 ℃, and controlling the air quantity to be 20 multiplied by 104m³The temperature of the hot air discharged from the vertical mill is 85 ℃, the rotating speed of a powder concentrator of the vertical mill is 110r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²Obtaining a finished product after Kg; in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and horizontal direction vibration amplitudes of a grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction vibration amplitude is larger than 2.5mm and the horizontal direction vibration amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 1.5m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, and the water spraying amount is 1.5m³H until the temperature is < 300 ℃.

Example 3: a production process of steel slag powder with an ultrahigh specific surface area based on a steel slag activation technology comprises the following specific production processes:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm; carrying out primary color separation on the steel slag particles I according to the optical characteristics of iron elements in the steel slag to obtain steel slag particles II enriched with the iron elements and steel slag particles III containing trace iron elements;

s2: pretreatment of steel slag particles II: mixing the steel slag particles II, the desulfurized gypsum and the wood calcium according to the proportion of 35 percent to 55 percent to 15 percent; adding water, mixing, stirring for 4min to obtain fluid slurry, and drying the mixed slurry at 35 deg.C for 18 hr;

s3: activation of steel slag particles II: mixing the pretreated steel slag particles II with electric furnace reducing slag and plastic-retaining thickening starch, heating to 850 ℃, and preserving heat for 5 hours;

s4: grinding steel slag particles: cooling the activated steel slag particles II to room temperature, and selecting unactivated steel slag particles III and activated steel slag particles II; mixing the steel slag particles II and the steel slag particles III according to the mass ratio of 4:10, then feeding the mixture into a vertical mill for direct grinding, controlling the pressure of a grinding roller of the vertical mill to be 12MPa, the temperature of hot air fed into the vertical mill to be 250 ℃, and the air volume to be 20 multiplied by 104m³The temperature of the hot air discharged from the vertical mill is 85 ℃, the rotating speed of a powder concentrator of the vertical mill is 110r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²Obtaining a finished product after Kg; in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and horizontal direction vibration amplitudes of a grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction vibration amplitude is larger than 2.5mm and the horizontal direction vibration amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 1.5m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, and the water spraying amount is 1.5m³H until the temperature is < 300 ℃.

In the above examples 1-3, the steel slag is directly ground into the steel slag powder with high specific surface area in example 1, and the desulfurized gypsum and the calcium carbonate are added into the same steel slag to be ground into the steel slag powder with high specific surface area in example 2; in the embodiment 3, the steel slag is subjected to color selection, desulfurized gypsum and calcium lignosulfonate are added into the iron-rich steel slag for activation, and then the mixture is mixed with the rest steel slag in proportion and then ground into steel slag powder with high specific surface area;

	example 1	Example 2	Example 3
				Specific surface area requirement	>700m2/Kg	>700m2/Kg	>700m2/Kg
Hourly production	45 ton/h	65 ton/h	68 ton/h
				Use of activating materials	0	240 ton/100 ton	200 ton/100 ton
Comprehensive power consumption	18 kilowatt-hour/ton	12 kilowatt-hour/ton	10 kWh/ton

The table shows in summary: after the steel slag is activated, the productivity is obviously improved, and the unit power consumption is obviously reduced; after color selection, activation treatment is carried out on the steel slag, and then the steel slag is mixed with residual steel slag particles for grinding, so that the comprehensive power consumption is reduced by 16.7 percent compared with the method of grinding after direct activation treatment; and the use of the activating material, namely activating the color-selected iron-rich steel slag after color selection and then mixing and grinding the activated iron-rich steel slag, saves about 40 tons of activating material per 100 tons of produced steel slag powder compared with grinding processing after directly adding the activating material.

Example 4: a production process of steel slag powder with an ultrahigh specific surface area based on a steel slag activation technology comprises the following specific production processes:

s1: screening steel slag tailings: crushing the steel slag tailings, and screening to obtain steel slag particles I, wherein the granularity of the steel slag particles I is smaller than 20 mm; carrying out primary color separation on the steel slag particles I according to the optical characteristics of iron elements in the steel slag to obtain steel slag particles II enriched with the iron elements and steel slag particles III containing trace iron elements;

s2: pretreatment of steel slag particles II: mixing the steel slag particles II, the desulfurized gypsum and the wood calcium according to the proportion of 35 percent to 55 percent to 15 percent; adding water, mixing, stirring for 4min to obtain fluid slurry, and drying the mixed slurry at 35 deg.C for 18 hr;

s3: activation of steel slag particles II: mixing the pretreated steel slag particles II with electric furnace reducing slag and plastic-retaining thickening starch, heating to 850 ℃, and preserving heat for 5 hours;

s4: grinding steel slag particles: cooling the activated steel slag particles II to room temperature, and selecting unactivated steel slag particles III and activated steel slag particles II; mixing the steel slag particles II and the steel slag particles III according to the mass ratio of 4.5:10, then feeding the mixture into a vertical mill for direct grinding, controlling the pressure of a grinding roller of the vertical mill to be 12MPa, the temperature of hot air fed into the vertical mill to be 250 ℃, and the air volume to be 20 multiplied by 104m³The temperature of the hot air discharged from the vertical mill is 85 ℃, the rotating speed of a powder concentrator of the vertical mill is 110r/min until the fineness of the steel slag particles II reaches the specific surface area of more than 700m²Obtaining a finished product after Kg; in the process of grinding the steel slag powder by the vertical grinding machine, the vertical direction and horizontal direction vibration amplitudes of a grinding disc of the vertical grinding machine are monitored in real time, if the vertical direction vibration amplitude is larger than 2.5mm and the horizontal direction vibration amplitude is larger than 2mm, the vertical grinding machine is sprayed with water internally, and the water spraying amount is 1.5m³H, until the amplitude in the vertical direction is less than 2.5mm and the amplitude in the horizontal direction is less than 2 mm; in the vertical milling process, the temperature of hot air entering the vertical mill is monitored in real time, if the temperature of the entering hot air is higher than 300 ℃, water is sprayed into the vertical mill, and the water spraying amount is 1.5m³H until the temperature is < 300 ℃.

Example 5: the rest of the process is the same as that of the example 4, and only the steel slag particles II and the steel slag particles III in the S4 are mixed according to the mass ratio of 5:10 and then ground;

	example 3	Example 4	Example 5
				Specific surface area requirement	>700m2/Kg	>700m2/Kg	>700m2/Kg
Hourly production	68 ton of	70 ton of	67 ton of the total
				Comprehensive power consumption	9 kWh/ton	8.5 kWh/ton	9.3 kWh/ton
Use of activating materials	200 ton/100 ton	180 ton/100 ton	210 ton/100 ton

As shown in the above table, in the embodiment 3-5, the same production method is adopted, different ratios of activated steel slag particles to unactivated steel slag particles are selected for grinding, and the activated iron-rich steel slag and the trace iron steel slag are mixed at a ratio of 4.5:10, so that the comprehensive power consumption is lower, the hourly capacity is higher, and the activated material used in unit yield is lower; compared with the technology of adopting the activating material by finger joint, the process technology of activating and mixing after color sorting is adopted on the whole, the comprehensive power consumption is obviously reduced, and the using amount of the activating material is reduced by more than 20%.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.