Superfine ground slag processing technology

Abstract

The invention relates to the technical field of slag processing, and discloses a superfine ground slag processing technology which comprises the following specific steps: step 1, slag pretreatment: firstly, screening collected slag through a vibrating screen to remove large impurities and parts which obviously do not meet the granularity requirement in the slag, the aperture of the screen is 5-10mm, and the size of the screen is 5-10mm; the screened slag enters impurity removal equipment, and fine impurities in the slag are further removed; and 2, the slag subjected to drying treatment pretreatment is fed into a drying machine to be dried, moisture is removed, the drying temperature is controlled to range from 150 DEG C to 200 DEG C, and the drying time ranges from 2 hours to 3 hours. According to the method, the slag is coarsely ground, then finely ground and finally superfine ground, so that the slag can be effectively processed into the superfine slag powder, reworking caused by the fact that part of the slag powder does not reach the standard is avoided, the performance and the additional value of the slag powder are improved, and the superfine powder processed from the slag is higher in grinding efficiency, more uniform in particle size distribution and stable in product quality.

Description

Technical Field

[0001] The invention relates to the technical field of slag processing, in particular to a superfine grinding slag processing technology. Background Art

[0002] Slag is a byproduct of steel production. After proper treatment and processing, it can become a building material or industrial raw material with high added value. Ultrafine grinding of slag can significantly improve its activity and performance, and has broad application prospects in cement, concrete and other fields.

[0003] The existing slag processing technology has the problem that when the slag is processed and ground, some products will overflow and mix with qualified mineral powder, resulting in the mineral powder being reworked and re-ground, resulting in low grinding efficiency, uneven particle size distribution, and unstable product quality. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a superfine grinding slag processing technology, which solves the problems of low grinding efficiency, uneven particle size distribution and unstable product quality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a superfine grinding slag processing technology, comprising the following specific steps:

[0006] Step 1: Slag pretreatment

[0007] First, the collected slag is screened through a vibrating screen to remove large impurities and parts that obviously do not meet the particle size requirements. The screen aperture is 5mm to 10mm. The screened slag enters the impurity removal equipment to further remove fine impurities.

[0008] Step 2: Drying

[0009] The pretreated slag is sent to the dryer to dry the slag and remove moisture. The drying temperature is controlled at 150-200°C and the drying time is 2-3 hours to reduce the moisture content of the slag to less than 1%;

[0010] Step 3: Ultrafine Grinding

[0011] The dried slag is coarsely ground, and the coarsely ground slag is further preliminarily classified, and the classified slag is finely ground, and the ore powder after fine grinding is finely classified, and finally the ore powder is ultra-finely ground. The grinding time is determined according to the initial particle size of the slag and the final required particle size, which is 2 to 4 hours;

[0012] Step 4: Grading

[0013] In step 3, the ground slag is subjected to preliminary classification and fine classification by a cyclone separator and an air classifier. In the preliminary classification, slag powder meeting the particle size of 20 to 45 mi u is separated, and the coarse particles that do not meet the requirements are returned to the ball mill for re-grinding. In the fine classification, ultra-fine slag powder meeting the particle size of 5 to 15 mi u is separated, and the particles that do not meet the requirements are returned to the vertical roller mill for re-grinding.

[0014] Step 5: Collection and packaging

[0015] The ultra-fine slag powder that meets the particle size requirements is collected into storage tanks and then packaged and stored.

[0016] Preferably, in step 3, the coarse grinding, fine grinding and ultrafine grinding include the following specific methods:

[0017] Rough grinding: The pretreated slag is sent to the ball mill for rough grinding. The speed and grinding time of the ball mill are controlled to make the slag particle size reach 100-200 meshes;

[0018] Fine grinding: The finer particles after intermediate classification are sent to the vertical roller mill for fine grinding. The pressure and speed of the roller mill are adjusted to make the slag particle size reach 400-600 mesh;

[0019] Ultrafine grinding: Use a vibration mill to grind the material to 1000-3000 mesh, and the corresponding powder particle size is usually 1 micron to 10 microns.

[0020] Preferably, in step 2, a hot air circulation system is introduced during the drying process to improve heat utilization and reduce energy consumption, and a humidity monitoring device is provided to monitor the moisture content of the slag in real time.

[0021] Preferably, in step 4, during the classification process, the cyclone separator and the air classifier improve the classification accuracy and efficiency by optimizing the air duct design and adjusting the air volume.

[0022] Preferably, in step five, a pulse bag dust collector is used during the collection process to effectively collect fine slag powder and reduce dust emissions. The packaging and storage environment should be kept dry and ventilated to prevent the slag powder from getting damp and agglomerating.

[0023] Preferably, during the coarse grinding process, the grinding media in the ball mill are made of high-hardness alloy balls, and the worn grinding media are regularly checked and replenished. During the fine grinding process, the surfaces of the grinding rollers and grinding discs of the vertical roller mill are coated with wear-resistant materials. During the ultrafine grinding process, the vibration mill is equipped with a cooling system to control the temperature during the grinding process.

[0024] Preferably, in step 4, the cyclone separator and the air classifier are both connected to an external circulation device, through which the slag that does not meet the requirements is returned to the previous stage for grinding.

[0025] The present invention provides a superfine grinding slag processing technology. It has the following beneficial effects:

[0026] 1. The present invention can effectively process slag into ultrafine slag powder by coarsely grinding the slag, then fine grinding it, and finally ultrafine grinding it, so as to avoid rework due to part of the slag powder not meeting the standards, improve its performance and added value, and make the grinding efficiency of slag processed into ultrafine powder higher, the particle size distribution more uniform, and the product quality stable.

[0027] 2. The present invention adopts cyclone separator and air classifier for classification, and uses external circulation device to return the slag that does not meet the requirements to the previous stage for grinding operation, thereby ensuring that the slag entering the ultrafine grinding stage has uniform particle size and improving the ultrafine grinding effect and product quality.

[0028] 3. The present invention grinds the slag multiple times and performs classification according to the degree of grinding. It optimizes the air duct design and adjusts the air volume in coordination with the external circulation device to achieve slag grinding and classification. The entire device is in a fully sealed state, and the dust generated during grinding will not escape to the outside, thereby reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a flow chart of a superfine grinding slag processing technology. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] Please see attached Figure 1 The embodiment of the present invention provides a superfine grinding slag processing technology, comprising the following specific steps:

[0033] Step 1: Slag pretreatment

[0034] First, the collected slag is screened through a vibrating screen to remove large impurities and parts that obviously do not meet the particle size requirements. The screen aperture is 5mm to 10mm. The screened slag enters the impurity removal equipment to further remove fine impurities such as metal particles and wood chips.

[0035] Step 2: Drying

[0036] The pretreated slag is sent to the dryer to dry the slag and remove moisture. The drying temperature is controlled at 150-200°C and the drying time is 2-3 hours to reduce the moisture content of the slag to less than 1%;

[0037] Step 3: Ultrafine Grinding

[0038] The dried slag is coarsely ground, and the coarsely ground slag is further preliminarily classified, and the classified slag is finely ground, and the ore powder after fine grinding is finely classified, and finally the ore powder is ultra-finely ground. The grinding time is determined according to the initial particle size of the slag and the final required particle size, which is 2 to 4 hours;

[0039] Step 4: Grading

[0040] In step 3, the ground slag is subjected to preliminary classification and fine classification by a cyclone separator and an air classifier. In the preliminary classification, slag powder meeting the particle size of 20 to 45 mi u is separated, and the coarse particles that do not meet the requirements are returned to the ball mill for re-grinding. In the fine classification, ultra-fine slag powder meeting the particle size of 5 to 15 mi u is separated, and the particles that do not meet the requirements are returned to the vertical roller mill for re-grinding.

[0041] Step 5: Collection and packaging

[0042] The ultra-fine slag powder that meets the particle size requirements is collected into storage tanks and then packaged and stored.

[0043] In step 3, coarse grinding, fine grinding and ultrafine grinding include the following specific methods:

[0044] Rough grinding: The pretreated slag is sent to the ball mill for rough grinding. The speed and grinding time of the ball mill are controlled to make the slag particle size reach 100-200 meshes;

[0045] Fine grinding: The finer particles after intermediate classification are sent to the vertical roller mill for fine grinding. The pressure and speed of the roller mill are adjusted to make the slag particle size reach 400-600 mesh;

[0046] Ultrafine grinding: Use a vibration mill to grind the material to 1000-3000 mesh, and the corresponding powder particle size is usually 1 micron to 10 microns.

[0047] In step 2, a hot air circulation system is introduced during the drying process to improve heat utilization and reduce energy consumption. At the same time, a humidity monitoring device is equipped to monitor the moisture content of the slag in real time.

[0048] In step 4, during the classification process, the cyclone separator and the air classifier improve the classification accuracy and efficiency by optimizing the air duct design and adjusting the air volume.

[0049] The cyclone separator and air classifier are connected to the external circulation device through air ducts to avoid dust dispersion. An air volume regulating device is adopted, which can accurately and flexibly adjust the air volume according to different slag characteristics and classification requirements. By real-time monitoring and analysis of the classification effect, the air volume parameters are continuously optimized to achieve a perfect match between the air volume and the air duct design, thereby significantly improving the classification accuracy and efficiency.

[0050] In step five, a pulse bag dust collector is used during the collection process to effectively collect fine slag powder and reduce dust emissions. The packaging and storage environment should be kept dry and ventilated to prevent the slag powder from getting damp and agglomerating.

[0051] In the collection process, advanced pulse bag dust collectors are carefully used. This pulse bag dust collector is equipped with high-quality filter bags, which have extremely precise pore structure and excellent filtering performance. It can capture and collect those fine slag powders extremely effectively, minimize the emission of dust to the external environment, and thus significantly reduce the pollution to the environment;

[0052] During the packaging and storage process, the environment must be kept dry and well ventilated. This is because a suitable dry environment can effectively inhibit the intrusion of moisture and prevent the slag powder from absorbing water vapor in the air. Good ventilation can promote air circulation and take away any damp air. By maintaining such an environmental state, the slag powder can be prevented from getting damp and agglomerated to the greatest extent, ensuring its stable and excellent quality so that it can exert its best performance and function in subsequent use.

[0053] During the coarse grinding process, the grinding media in the ball mill are made of high-hardness alloy balls. The worn grinding media are regularly checked and replenished to ensure the coarse grinding effect. During the fine grinding process, the grinding rollers and grinding discs of the vertical roller mill are coated with wear-resistant materials to extend the service life of the equipment and reduce maintenance costs. During the ultra-fine grinding process, the vibration mill is equipped with a cooling system to control the temperature during the grinding process to prevent the material from being damaged due to overheating.

[0054] In step 4, both the cyclone separator and the air classifier are connected to an external circulation device, through which the slag that does not meet the requirements is returned to the previous stage for grinding.

[0055] The external circulation device consists of an efficient conveying pipeline, precise control valves and a powerful power drive component. After being classified by the cyclone separator and the air classifier, the slag that does not meet the particle size requirements will be precisely operated by this external circulation device. Through the smooth conveying pipeline, with the help of the precise control of the flow rate and flow direction by the control valve, and under the powerful and stable power push of the power drive component, it will be returned to the corresponding grinding mill of the previous level in an orderly and rapid manner, and the grinding operation will be carried out again to ensure that high-quality ultrafine slag powder that meets the particle size requirements can be obtained in the end.

[0056] The following is an introduction in conjunction with specific embodiments:

[0057] Embodiment 1:

[0058] Slag pretreatment: the mesh size is 5 mm;

[0059] Drying treatment: The drying temperature is controlled at 150-200°C and the drying time is 2 hours;

[0060] Ultrafine grinding: grinding time is 2 hours;

[0061] Grading: In the preliminary classification, slag powder with a particle size of 20 mi u is separated, and in the fine classification, the particle size is 5 mi u.

[0062] Coarse grinding: slag particle size reaches 100 mesh;

[0063] Fine grinding: slag particle size reaches 400 mesh;

[0064] Ultrafine grinding: Use a vibration mill to grind the material to 1000 mesh, and the corresponding powder particle size is usually 1 micron.

[0065] Embodiment 2:

[0066] Slag pretreatment: The mesh size is 7mm;

[0067] Drying treatment: The drying temperature is controlled at 175°C and the drying time is 2.5 hours;

[0068] Ultrafine grinding: grinding time is 3 hours;

[0069] Grading: In the preliminary classification, slag powder with a particle size of 30 mi u is separated, and in the fine classification, the particle size of 10 mi u is separated.

[0070] Coarse grinding: slag particle size reaches 150 mesh;

[0071] Fine grinding: slag particle size reaches 500 mesh;

[0072] Ultrafine grinding: Use a vibration mill to grind the material to 2000 mesh, and the corresponding powder particle size is usually 5 microns.

[0073] Embodiment three:

[0074] Slag pretreatment: the mesh size is 10 mm;

[0075] Drying treatment: The drying temperature is controlled at 200°C and the drying time is 3 hours;

[0076] Ultrafine grinding: grinding time is 4 hours;

[0077] Grading: In the preliminary classification, slag powder with a particle size of 45 mi u is separated, and in the fine classification, the particle size of 15 mi u is separated.

[0078] Coarse grinding: slag particle size reaches 200 mesh;

[0079] Fine grinding: slag particle size reaches 600 mesh;

[0080] Ultrafine grinding: Use a vibration mill to grind the material to 3000 mesh, and the corresponding powder particle size is usually 10 microns.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A superfine grinding slag processing technology, characterized in that: The specific steps include: Step 1: Slag pretreatment First, the collected slag is screened through a vibrating screen to remove large impurities and parts that obviously do not meet the particle size requirements. The screen aperture is 5mm to 10mm. The screened slag enters the impurity removal equipment to further remove fine impurities. Step 2: Drying The pretreated slag is sent to the dryer to dry the slag and remove moisture. The drying temperature is controlled at 150-200°C and the drying time is 2-3 hours to reduce the moisture content of the slag to less than 1%; Step 3: Ultrafine Grinding The dried slag is coarsely ground, and the coarsely ground slag is further preliminarily classified, and the classified slag is finely ground, and the ore powder after fine grinding is finely classified, and finally the ore powder is ultra-finely ground. The grinding time is determined according to the initial particle size of the slag and the final required particle size, which is 2 to 4 hours; Step 4: Grading In step 3, the ground slag is subjected to preliminary classification and fine classification by a cyclone separator and an air classifier. In the preliminary classification, slag powder with a particle size of 20 to 45 miu is separated, and the coarse particles that do not meet the requirements are returned to the ball mill for re-grinding. In the fine classification, ultra-fine slag powder with a particle size of 5 to 15 miu is separated, and the particles that do not meet the requirements are returned to the vertical roller mill for re-grinding. Step 5: Collection and packaging The ultra-fine slag powder that meets the particle size requirements is collected into storage tanks and then packaged and stored.

2. The ultra-fine grinding slag processing technology according to claim 1 is characterized in that: In step 3, the coarse grinding, fine grinding and ultrafine grinding include the following specific methods: Rough grinding: The pretreated slag is sent to the ball mill for rough grinding. The speed and grinding time of the ball mill are controlled to make the slag particle size reach 100-200 meshes; Fine grinding: The finer particles after intermediate classification are sent to the vertical roller mill for fine grinding. The pressure and speed of the roller mill are adjusted to make the slag particle size reach 400-600 mesh; Ultrafine grinding: Use a vibration mill to grind the material to 1000-3000 mesh, and the corresponding powder particle size is usually 1 micron to 10 microns.

3. The ultra-fine grinding slag processing technology according to claim 1 is characterized in that: In the step 2, a hot air circulation system is introduced during the drying process to improve heat utilization and reduce energy consumption. At the same time, a humidity monitoring device is provided to monitor the moisture content of the slag in real time.

4. The ultra-fine grinding slag processing technology according to claim 1 is characterized in that: In step 4, during the classification process, the cyclone separator and the air classifier can improve the classification accuracy and efficiency by optimizing the air duct design and adjusting the air volume.

5. The ultra-fine grinding slag processing technology according to claim 1 is characterized in that: In the step 5, a pulse bag dust collector is used in the collection process to effectively collect fine slag powder and reduce dust emission. The packaging and storage environment should be kept dry and ventilated to prevent the slag powder from getting damp and agglomerating.

6. The ultra-fine grinding slag processing technology according to claim 2 is characterized in that: During the coarse grinding process, the grinding media in the ball mill are high-hardness alloy balls, and the worn grinding media are regularly checked and replenished. During the fine grinding process, the grinding rollers and grinding discs of the vertical roller mill are coated with wear-resistant materials. During the ultrafine grinding process, the vibration mill is equipped with a cooling system to control the temperature during the grinding process.

7. The ultra-fine grinding slag processing technology according to claim 1 is characterized in that: In the step 4, the cyclone separator and the air classifier are both connected to an external circulation device, through which the slag that does not meet the requirements is returned to the previous stage for grinding.

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