Preparation process of high-strength unbreakable scrap steel flake press cake

Abstract

The application discloses a kind of preparation processes of high-strength not fragile scrap steel flake press cake, it is related to metal scrap processing field, including step one: shaping treatment is carried out to raw material, the long filamentous scrap steel flake obtained by recycling is input into YSJ1380IV-110 type metal pre-crusher, removes the super-long continuous silk strip, mutual entangled agglomerate material in material by the shearing shredding and roller shaping composite processing of equipment;The preparation process of a kind of high-strength not fragile scrap steel flake press cake, through the double-station linkage processing of YSJ1380IV-110 type metal pre-crusher, the winding jam problem of long filament flake is completely eliminated, the invalid energy consumption caused by repeated dredging, idling shearing of equipment is substantially reduced, while avoiding excessive crushing to produce fine powder loss, realize the significant improvement of raw material utilization, 3-8mm uniform discharge makes the loading process smooth without jam, adapts the large-scale continuous production of low energy consumption.

Description

Technical Field

[0001] This invention relates to metal scrap briquetting technology, specifically to a process for preparing high-strength, non-breakable scrap steel shavings briquetting cakes. Background Technology

[0002] Scrap steel shavings, a typical metal offcut generated during machining, are generally long, fibrous, loosely structured, and easily entangled. Traditional recycling methods often involve direct stockpiling or simple briquetting, which presents significant technical bottlenecks. Current mainstream processes generally rely on a single hydraulic press to physically compact untreated scrap steel shavings.

[0003] Existing pre-crushing equipment typically uses a single-blade crushing mode, which can easily lead to over-crushing and the generation of a large amount of fine powder, exacerbating dust pollution and reducing the density of the pressed cake. Therefore, a preparation process for high-strength, non-crushable waste steel shavings pressed cake is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a process for preparing high-strength, non-breakable scrap steel shavings cakes, in order to solve the problems of the existing technology that uses a single blade crushing mode, which easily leads to over-crushing and the generation of a large amount of fine powder, which easily aggravates dust pollution and reduces the density of the cakes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a process for preparing high-strength, non-breakable scrap steel shavings cakes, comprising the following steps:

[0006] Step 1: Shape the raw materials. The long filament scrap steel shavings obtained from recycling are put into the YSJ1380IV-110 metal pre-shredder. Through the combined processing of shearing, shredding and roller shaping of the equipment, the extra-long continuous filaments and tangled lumps mixed in the material are removed. Finally, the scrap steel shreds with regular shape and uniform size are screened out.

[0007] Step 2: Add adhesive to the mixed raw materials. Add adhesive at a precise rate of 5% of the total mass of the scrap steel obtained in Step 1. Then, put the mixture into a forced mixing device and mix thoroughly so that the adhesive is evenly attached to the surface of each scrap steel particle without local agglomeration or missed coating.

[0008] Step 3: The mixed raw materials are pressed and shaped under high pressure. The mixed and viscous material is quantitatively fed into the forming mold cavity of the Y83-800T type metal scrap press. High pressure is applied through the hydraulic system for extrusion and pressure is maintained simultaneously to produce a dense and regular scrap steel blister blank.

[0009] Step 4: Curing and shaping the mixed raw materials at room temperature, then smoothly removing the pressed cake blank from the mold cavity and placing it in a room temperature ventilated environment for static curing. After the adhesive has completely cross-linked and cured, the final finished product, scrap steel shavings pressed cake, is obtained.

[0010] Furthermore, in step one, the spindle speed of the YSJ1380IV-110 metal pre-crusher is 800-1000 r / min. After being shaped and processed by this equipment, the single-segment length of the obtained scrap steel pre-crushed material is strictly controlled within the range of 3-8 mm. There are no continuous long filaments or tangled clumps remaining in the material, and the fluidity meets the feeding requirements for subsequent pressing and molding.

[0011] Furthermore, in step two, the stirring time of the material is 3 to 5 minutes to ensure the uniformity of the adhesive adhesion on the surface of the scrap steel; the adhesive includes inorganic high-temperature resistant adhesive and industrial metal binder, which can meet the bonding strength requirements of subsequent high-temperature smelting scenarios.

[0012] Furthermore, in step three, the nominal pressure of the Y83-800T metal scrap parallel machine is 8000kN, and the actual pressing pressure applied during the forming process is controlled within the range of 18-22MPa. The pressure holding time is set to 15-25s simultaneously to ensure that there are no loose gaps inside the pressed cake blank and that the density meets the requirements for transfer and furnace feeding.

[0013] Furthermore, in step four, the curing time of the pressed cake blank at room temperature is not less than 30 minutes to ensure that the adhesive completes the cross-linking reaction, so that the finished pressed cake has sufficient structural strength and will not break or scatter during transportation.

[0014] Furthermore, in step one, the combined processing of shearing and shredding with roll forming adopts a dual-station linkage mode of radial shearing to break the filaments first and then axial roll forming. The shearing to break the filaments uses staggered alloy serrated blades, and the roll forming is equipped with two sets of differential speed pressure rollers, which can reduce the winding rate of long filament shavings from 32% in the traditional process to below 0.5%, while avoiding excessive crushing to generate too much fine powder and reducing dust loss in subsequent pressing and forming.

[0015] Furthermore, in step two, the forced stirring equipment adopts a spiral double-shaft counter-stirring structure. During the stirring process, constant temperature hot air at 40°C is simultaneously introduced for micro-heating, which reduces the viscosity of the adhesive without changing its chemical properties. This allows a uniform nanoscale coating layer to be formed on the surface of scrap steel within a stirring time of 3-5 minutes, increasing the effective utilization rate of the adhesive by 28% and avoiding the problem of localized accumulation and clumping of the adhesive in traditional stirring.

[0016] Furthermore, in step four, the ambient temperature ventilation environment adopts a directional side-blowing low-speed air supply mode, with the wind speed controlled at 0.8-1.2 m / s. This avoids the problems of rapid film formation of the adhesive on the surface of the pressed cake and incomplete internal curing caused by direct blowing. After curing, the overall density of the finished pressed cake can reach 6.2-6.5 t / m³, and the drop resistance of a single pressed cake is ≥1.2m free drop without breaking, fully meeting the industrial use standards for scrap steel recycling and transfer and direct blast furnace charging.

[0017] Compared with the prior art, the present invention provides a preparation process for high-strength, non-breakable scrap steel shavings cakes. Through the dual-station linkage processing of the YSJ1380IV-110 metal pre-crusher, the problem of entanglement and jamming of long shavings is completely eliminated, the ineffective energy consumption caused by repeated unblocking and idling shearing of the equipment is greatly reduced, and the loss of fine powder due to over-crushing is avoided. This significantly improves the utilization rate of raw materials. The uniform discharge of 3-8mm makes the feeding process smooth and without jamming, which is suitable for low-energy-consumption large-scale continuous production.

[0018] The spiral twin-shaft counter-current agitator, combined with 40℃ constant temperature hot air micro-heating, can complete the uniform nano-coating of scrap steel fragments in just 3-5 minutes. This significantly shortens the high-load operation time of the agitator, directly reducing energy consumption in the mixing process. At the same time, the effective utilization rate of the adhesive is greatly improved, eliminating the need for additional adhesive to make up for missed coating defects and completely preventing material waste. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 A flowchart illustrating the steps provided in an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] As attached Figure 1 As shown:

[0023] Example:

[0024] This invention provides a process for preparing high-strength, non-breakable scrap steel shavings cakes, comprising the following steps:

[0025] Step 1: Shape the raw materials. The long filament scrap steel shavings obtained from recycling are put into the YSJ1380IV-110 metal pre-shredder. Through the combined processing of shearing, shredding and roller shaping of the equipment, the extra-long continuous filaments and tangled lumps mixed in the material are removed. Finally, the scrap steel shreds with regular shape and uniform size are screened out.

[0026] Furthermore, in step one, the spindle speed of the YSJ1380IV-110 metal pre-crusher is 800-1000 r / min. After being shaped and processed by this equipment, the single-segment length of the obtained scrap steel shreds is strictly controlled within the range of 3-8 mm. There are no continuous long filaments or tangled clumps left in the material, and the fluidity meets the feeding requirements for subsequent pressing and forming. In step one, the combined processing of shearing and shredding and roller pressing and forming adopts a dual-station linkage mode of first radially shearing to break the filaments and then axially pressing and forming the pellets. The shearing to break the filaments uses staggered alloy serrated blades, and the roller pressing and forming is equipped with two sets of differential speed pressure rollers, which can reduce the entanglement rate of long filament shavings from 32% in the traditional process to below 0.5%, while avoiding excessive crushing to generate too much fine powder and reducing dust loss in subsequent pressing and forming.

[0027] Step 2: Add adhesive to the mixed raw materials. Add adhesive at a precise rate of 5% of the total mass of the scrap steel obtained in Step 1. Then, put the mixture into a forced mixing device and mix thoroughly so that the adhesive is evenly attached to the surface of each scrap steel particle without local agglomeration or missed coating.

[0028] Furthermore, in step two, the stirring time of the material is 3-5 minutes to ensure the uniformity of the adhesive adhesion on the surface of the scrap steel. The adhesive includes inorganic high-temperature resistant adhesive and industrial metal binder, which can meet the bonding strength requirements of subsequent high-temperature smelting scenarios. In step two, the forced stirring equipment adopts a spiral double-shaft counter-stirring structure. During the stirring process, constant temperature hot air at 40°C is introduced simultaneously for micro-heating, which reduces the viscosity of the adhesive without changing its chemical properties. This allows it to form a uniform nanoscale coating layer on the surface of the scrap steel within a stirring time of 3-5 minutes, increasing the effective utilization rate of the adhesive by 28% and avoiding the problem of localized accumulation and clumping of the adhesive in traditional stirring.

[0029] Step 3: The mixed raw materials are pressed and shaped under high pressure. The mixed and viscous material is quantitatively fed into the forming mold cavity of the Y83-800T type metal scrap press. High pressure is applied through the hydraulic system for extrusion and pressure is maintained simultaneously to produce a dense and regular scrap steel blister blank.

[0030] Furthermore, in step three, the nominal pressure of the Y83-800T metal scrap parallel machine is 8000kN, and the actual pressing pressure applied during the forming process is controlled within the range of 18 to 22MPa. The pressure holding time is set to 15 to 25s simultaneously to ensure that there are no loose gaps inside the pressed cake blank and that the density meets the requirements for transfer and furnace feeding.

[0031] Step 4: The mixed raw materials are cured and shaped at room temperature. The pressed cake blank is then smoothly removed from the mold cavity and placed in a room temperature ventilated environment to cure. After the adhesive is completely cross-linked and cured, the final finished product, scrap steel shavings cake, is obtained.

[0032] Furthermore, in step four, the curing time of the pressed cake blank at room temperature is no less than 30 minutes to ensure that the adhesive completes the cross-linking reaction, so that the finished pressed cake has sufficient structural strength and will not break or scatter during transportation. In step four, the room temperature ventilation environment adopts a directional side-blowing low wind speed air supply mode, with the wind speed controlled at 0.8-1.2m / s, to avoid the problem of rapid film formation of adhesive on the surface of the pressed cake and incomplete internal curing caused by direct blowing. After curing, the overall density of the finished pressed cake can reach 6.2-6.5t / m³, and the drop resistance of a single pressed cake is ≥1.2m free drop without breaking, which fully meets the industrial use standards for scrap steel recycling and transportation and direct blast furnace charging.

[0033] Working Principle: Addressing the high entanglement characteristics of raw, long-filament scrap steel shavings, the YSJ1380IV-110 metal pre-shredder utilizes a high-speed (800-1000 r / min) main shaft driving staggered alloy serrated blades. Through radial shearing, it precisely cuts continuous long filaments into short segments of 3-8 mm. Subsequently, two sets of differential-speed pressure rollers eliminate the curling and tangling of the broken filament edges through axial roller pressure, fundamentally avoiding equipment jamming and ineffective energy consumption caused by repeated idling shearing due to filament entanglement, significantly reducing power waste in the pre-processing stage. This process avoids... It avoids the loss of raw materials caused by excessive grinding and the resulting large amount of fine powder, and reconstructs the particle shape of the material, transforming the originally messy and intertwined long filaments into regular short particles with excellent flowability. The usable proportion of the raw material itself is greatly increased. At the same time, it completely eliminates the losses caused by frequent shutdowns and restarts due to filament jamming and bridging. The feeding process does not require manual intervention to clear blockages, and the ineffective energy consumption in the feeding process is greatly reduced. The pre-processing capacity of a single batch can stably reach 2.5t / h, which is fully adapted to the low-consumption operation requirements of large-scale continuous production and eliminates structural obstacles for subsequent uniform filling of the mold cavity.

[0034] 40℃ constant temperature hot air micro-heating can reduce the viscosity of the adhesive without damaging its molecular structure. Combined with the shearing and dispersing effect of the spiral double-shaft counter-stirring, the adhesive, which accounts for 5% of the total mass of the material, is evenly spread on the surface of each scrap steel particle within 3-5 minutes, forming a uniform nanoscale coating layer. This mode eliminates the problems of local agglomeration and missed coating that occur in traditional coarse stirring. It eliminates the need to extend the stirring time or add extra adhesive to make up for the defects of uneven coating, greatly reducing the operating energy consumption of the stirring process. At the same time, the effective role of the adhesive is greatly increased, completely avoiding the material waste caused by adhesive accumulation and clumping. It allows a continuous bonding transition layer to be formed at the contact interface of every two adjacent metal particles, building a uniform interface foundation for subsequent chemical cross-linking. Uniform coating can be achieved with extremely low adhesive addition, and the energy efficiency ratio of material input is more than 1.28 times that of traditional processes.

[0035] The Y83-800T metal scrap press uses a stable high pressure of 18-22MPa to extrude materials coated with adhesive. During the 15-25s holding pressure process, metal particles undergo plastic slippage to fill internal voids, while the thin adhesive layer at the interface is further compacted, maximizing the physical interlocking effect between metal particles. This process compresses the porosity of the pressed cake to below 8%, achieving a high overall density of 6.2-6.5t / m³. At the same time, the adhesive molecules are anchored in the microscopic pits on the metal surface under high pressure, forming a pre-bonded state of mechanical interlocking, avoiding the problem of internal springback and loosening after demolding. It eliminates the need for repeated pressing to increase the density of the pressed cake, significantly reducing the high-pressure loading energy consumption of the hydraulic system. At the same time, the defect rate in the pressing and forming process is greatly reduced, avoiding secondary energy consumption caused by rework of scrap products. The weight of qualified pressed cakes produced per unit of energy consumption is significantly increased compared with the traditional pure physical compaction process, and the output efficiency of energy input is qualitatively improved.

[0036] The directional side-blowing low-velocity airflow mode of 0.8-1.2 m / s ensures air circulation to remove trace amounts of moisture generated by the cross-linking reaction, while avoiding the defects of rapid film formation on the surface of the pressed cake and hindered internal curing caused by strong direct airflow. It eliminates the need for prolonged high-power blowing to ensure curing effect, significantly reducing ventilation energy consumption during the curing process. During a static resting period at room temperature of no less than 30 minutes, the inorganic high-temperature resistant adhesive molecules uniformly distributed on the metal interface gradually complete the three-dimensional cross-linking reaction, forming a continuous rigid bonding network between the metal particles, ultimately bonding the "metal particles..." The dual effect of "particle physical intercalation + adhesive chemical cross-linking" ensures complete curing, enabling the finished briquettes to achieve an impact strength of ≥1.2m free drop without breaking. During transportation, there is almost no raw material loss due to fragmentation, and the overall retention rate of scrap steel resources is greatly improved. At the same time, this process is adapted to the bonding stability under high-temperature smelting scenarios of 1600℃. There is no large amount of fine dust generated during blast furnace charging, the raw material escape loss in the smelting process is greatly reduced, and the continuous operation efficiency of smelting charging is significantly improved, fully meeting the low-consumption requirements of industrial transportation and direct blast furnace charging.

[0037] By setting up the above technical solution and using the dual-station linkage processing of the YSJ1380IV-110 metal pre-crusher, the problem of entanglement and jamming of long filament shavings is completely eliminated, the ineffective energy consumption caused by repeated unblocking and idling shearing of the equipment is greatly reduced, and the loss of fine powder due to excessive crushing is avoided, thus achieving a significant improvement in raw material utilization. The uniform discharge of 3-8mm makes the feeding process smooth and without jamming, which is suitable for low-energy-consumption large-scale continuous production.

[0038] The spiral twin-shaft counter-current agitator, combined with 40℃ constant temperature hot air micro-heating, can complete the uniform nano-coating of scrap steel fragments in just 3-5 minutes, which greatly shortens the high-load operation time of the agitator and directly reduces the energy consumption of the mixing process. At the same time, the effective utilization rate of the adhesive is greatly improved, and there is no need to add additional adhesive to make up for the missing coating defects, completely eliminating material waste.

[0039] Relying on the stable high pressure and precise pressure holding control of the Y83-800T metal chip parallel machine, the metal particles are fully filled with internal gaps, and high-density pressed cakes can be obtained without repeated pressure replenishment. This greatly reduces the high-pressure loading energy consumption of the hydraulic system, and at the same time almost eliminates defective products such as demolding springback and delamination cracking, avoiding secondary energy consumption caused by rework of scrap products, and greatly improving the qualified output efficiency of the molding process.

[0040] The directional side-blowing low-speed room temperature curing mode can ensure uniform cross-linking of the adhesive throughout the entire area without the need for high-power hot air baking, which greatly reduces the energy consumption of ventilation and temperature control during the curing stage. The finished patties have excellent impact resistance, and there is almost no fragment loss during the transportation process. The retention rate of scrap steel resources throughout the entire process is greatly improved. At the same time, it is suitable for high-temperature smelting scenarios, which greatly reduces the escape of fine powder dust during furnace charging, and simultaneously improves the raw material utilization rate and feeding efficiency in the smelting process.

[0041] The entire process uses mature standard models commonly used in the market. It can be connected to existing production lines without customization or modification, saving the extra resource investment in the research and development and manufacturing of customized equipment. The operation threshold is extremely low, which greatly reduces the overall energy consumption of human operation and maintenance. Small and medium-sized scrap steel recycling enterprises can quickly start mass production. Energy loss in the whole chain is systematically controlled, and the utilization rate of various resources is comprehensively improved.

[0042] The YSJ1380IV-110 metal pre-shredder and Y83-800T metal chip parallel mill used in the entire process are both mature standard models commonly used in the market. They can be directly connected to existing scrap steel processing production lines without customization or modification, avoiding the additional resource investment in the research and development and manufacturing of customized equipment. All process parameters are fully quantifiable and controllable. Ordinary operators can complete the entire process operation after a short training period. There is no need to configure an additional high-end technical team, which significantly reduces the manpower and management energy consumption on the production side. The threshold for small and medium-sized scrap steel recycling enterprises to start is extremely low, and large-scale mass production can be achieved quickly. Energy loss in the entire chain is systematically controlled, and the utilization rate of various scrap steel, adhesives and other resources is comprehensively improved. The overall energy efficiency of production and operation is far higher than that of traditional imported customized production line models.

[0043] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A process for preparing high-strength, non-breakable scrap steel shavings cakes, characterized in that, Includes the following steps: Step 1: Shape the raw materials. The long filament scrap steel shavings obtained from recycling are put into the YSJ1380IV-110 metal pre-shredder. Through the combined processing of shearing, shredding and roller shaping of the equipment, the extra-long continuous filaments and tangled lumps mixed in the material are removed. Finally, the scrap steel shreds with regular shape and uniform size are screened out. Step 2: Add adhesive to the mixed raw materials. Add adhesive at a precise rate of 5% of the total mass of the scrap steel obtained in Step 1. Then, put the mixture into a forced mixing device and mix thoroughly so that the adhesive is evenly attached to the surface of each scrap steel particle without local agglomeration or missed coating. Step 3: The mixed raw materials are pressed and shaped under high pressure. The mixed and viscous material is quantitatively fed into the forming mold cavity of the Y83-800T type metal scrap press. High pressure is applied through the hydraulic system for extrusion and pressure is maintained simultaneously to produce a dense and regular scrap steel blister blank. Step 4: Curing and shaping the mixed raw materials at room temperature, then smoothly removing the pressed cake blank from the mold cavity and placing it in a room temperature ventilated environment for static curing. After the adhesive has completely cross-linked and cured, the final finished product, scrap steel shavings pressed cake, is obtained.

2. The preparation process of high-strength, non-breakable scrap steel shavings patties according to claim 1, characterized in that, In step one, the spindle speed of the YSJ1380IV-110 metal pre-crusher is 800-1000 r / min.

3. The preparation process of high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step two, the stirring time of the material is 3 to 5 minutes; the adhesive includes inorganic high-temperature resistant adhesive and industrial metal adhesive.

4. The preparation process of high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step three, the nominal pressure of the Y83-800T metal chip parallel machine is 8000kN, the actual pressing pressure applied during the forming process is controlled within the range of 18-22MPa, and the pressure holding time is set to 15-25s.

5. The preparation process of high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step four, the curing and standing time of the pressed cake blank at room temperature shall not be less than 30 minutes.

6. The preparation process of a high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step one, the combined processing of shearing and shredding and rolling and shaping adopts a dual-station linkage mode of radial shearing to break the wires and then axial rolling and pelletizing. The shearing and breaking of the wires uses staggered alloy saw blades, and the rolling and pelletizing is equipped with two sets of differential speed pressure rollers.

7. The preparation process of high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step two, the forced stirring device adopts a spiral double-shaft counter-stirring structure, and a constant temperature hot air of 40°C is simultaneously introduced for micro-heating during the stirring process.

8. The preparation process of high-strength, non-breakable scrap steel shavings cake according to claim 1, characterized in that, In step four, the ambient temperature ventilation environment adopts a directional side-blowing low-speed air supply mode, with the wind speed controlled between 0.8 and 1.2 m / s.

Images