CN104711392B - A kind of production system being passivated pure calcium core-spun yarn - Google Patents
A kind of production system being passivated pure calcium core-spun yarn Download PDFInfo
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Abstract
The invention discloses a kind of production system being passivated pure calcium core-spun yarn and production method thereof, belong to steel-making furnace outer refining technology field。The present invention includes heater, extruder, core-spun yarn unit, Passivation Treatment device and automatic filling mechanism, described automatic filling mechanism includes pressure transducer, electromagnetic valve, passivation liquid pump and control unit, the liquid outlet of passivation liquid pump is connected by a liquid-transport pipe-line with the inlet on Passivation Treatment device top, is provided with an electromagnetic valve on this liquid-transport pipe-line；Pressure transducer is arranged on the inlet place on Passivation Treatment device top, the signal output part of pressure transducer is connected with the input of control unit, the switch of passivation liquid pump is connected with the outfan of control unit, and the liquid inlet of this passivation liquid pump is connected with passivating solution fluid reservoir by pipeline。The pure calcium core-spun yarn of passivation in the application of the invention, decreases the oxidation loss of calcium line, makes the recovery rate of calcium in molten steel be greatly improved。
Description
Technical field
The invention belongs to steel-making furnace outer refining technology field, more particularly, it relates to a kind of production system being passivated pure calcium core-spun yarn and production method thereof。
Background technology
The modern high efficiency of STEELMAKING PRODUCTION and developing rapidly of furnace rear refining technology, the particularly extensive use of furnace rear liquid steel refining wire-feeding technique, make high-purity clean steel produce and be possibly realized。Calcium treatment wire-feeding technique is a kind of high efficiency technical means carrying out final refining treatment for the high-cleanness high-quality steel that inclusion morphology, quantitative requirement is strict, and molten steel, mainly under Argon coordinates, is fed calcium core-spun yarn by it。Calcium treatment wire-feeding technique not only has ideal effect in deoxidation of molten steel, desulfurization, change inclusion morphology etc.; and realizing the trimming of steel; improve recovery rate and the hit rate of element; the addition of noble element is greatly reduced; and reduce production operation and operating cost; improve the aspects such as product quality and also there is remarkable advantage, in enterprise economic benefit and environmental conservation etc., also show bigger superiority simultaneously。
Traditional silico-calcium, ferro-calcium core-spun yarn have deoxidation, desulfurization and steel inclusion carry out the function of degenerative treatments, be conducive to the improvement of the properties of steel and the efficient production of continuous casting, but it is uneven to there is material composition, owing to material is impure, field trash and harmful element are brought in steel, pollute molten steel and the problem of calcium recovery rate instability。In recent years, the pure calcium line of real core that domestic steel mill popularity uses solves the problems referred to above existed in silico-calcium, ferro-calcium core-spun yarn use procedure, and burn-off rate comparatively fast, causes that the problems such as slag splash have also been obtained and is effectively improved after making the phenomenons such as the card line occurred in the line feeding process caused owing to using powder core-spun yarn to there is powder weight and the uneven of composition, broken string and powder core-spun yarn contact with molten steel。The production system of the existing pure calcium line of real core is as it is shown in figure 1, wherein: 1, heater；2, extruder；8, core-spun yarn unit, due in the process of manufacture of the real pure calcium line product of core (extruded by extruder become calcium metal silk and calcium metal silk is overmolding to heart yearn processing procedure), calcium metal silk is constantly exposed in air, when the calcium silk temperature just squeezed out especially by extruder is still more than 100 DEG C, calcium silk surface can form the compact oxidation layer about one layer of 0.5mm thickness at once, in sweltering heat, the south that air humidity is big, calcium metal silk surface oxidation is particularly acute, calcium silk consumption can be increased, the Ca content in heart yearn is made to reduce 0.1-0.5%, thus affecting core-spun yarn quality index and steel mill's Calcium treatment result of use, reduce the recovery rate of calcium, increase steel mill and feed calcium line amount and Calcium treatment production cost。
Through retrieval, it is disclosed about the patent application being passivated the pure calcium filament core-spun wire of solid metal processing in Calcium treatment wire-feeding technique, but often adopt when calcium line being passivated and processing and manually smear mode or by artificial to filling passivating solution in Passivation Treatment device, thus adding the labor intensity of workman, reduce the seriality of production, make work efficiency be substantially reduced；And owing to the proportioning problem of passivating solution or passivating solution make calcium line still can aoxidize in Passivation Treatment process with contacting of air in Passivation Treatment process, thus reducing the passivation effect of calcium line, the recovery rate making calcium in molten steel reduces, and have impact on the effect of external refining。Such as Chinese Patent Application No.: 20111013201.3, the applying date: on May 21st, 2011, denomination of invention: the manufacture method of the pure calcium core-spun yarn of solid passivation, metal calcium line is passivated by this application case in the exit of twine machine process, then again it is carried out coated steel band process, by using the pure calcium core-spun yarn of solid passivation in this application case, molten steel can not be made to increase silicon and other impurity, the gasification rate of calcium metal can be delayed to a certain extent, when reducing line feeding, phenomenon is seethed on slag surface, and improve the recovery rate of calcium, but mainly adopt when calcium filament core-spun wire is passivated processing by it and manually the passivating solution of calcium is spread upon calcium line surface, add the labor intensity of workman, the Passivation Treatment of calcium line is inefficient, and owing to smearing, speed is relatively slow and calcium line can not be completely covered by passivating solution immediately in Passivation Treatment process, the protection against oxidation effect of calcium line is poor, so that the recovery rate of calcium is still relatively low in molten steel。
Summary of the invention
1. invention to solve the technical problem that
It is an object of the invention to solve in the pure calcium core-spun yarn process of manufacture of existing passivation, manually smear mode owing to adopting or be passivated processing to calcium silk to addition passivating solution in Passivation Treatment device by artificial, add the labor intensity of workman, reduce the seriality of production, make work efficiency be substantially reduced；And because with contacting of air, the proportioning problem of passivating solution or passivating solution cause that the oxidative phenomena of calcium line is still more serious in Passivation Treatment process in Passivation Treatment process, so that the content of Ca still declines to some extent in heart yearn, reduce the passivation effect of calcium line, affect steel mill's Calcium treatment result of use and calcium recovery rate, make the problems such as steel mill's Calcium treatment production cost increase, it is provided that a kind of production system being passivated pure calcium core-spun yarn and production method thereof。A kind of production system being passivated pure calcium core-spun yarn in the application of the invention and production method thereof, the Passivation Treatment efficiency that can make calcium line is greatly improved, decrease the calcium line oxidation loss when Passivation Treatment, so that the recovery rate of calcium increases in molten steel, ensure that the effect of iron and steel external refining, and the labor intensity of workman can be reduced, save cost。
2. technical scheme
For reaching above-mentioned purpose, technical scheme provided by the invention is:
A kind of production system being passivated pure calcium core-spun yarn of the present invention, including heater, extruder, core-spun yarn unit, Passivation Treatment device and automatic filling mechanism, wherein, described heater is positioned at the feed end of described extruder, the arrival end of described Passivation Treatment device is positioned at the discharge end of described extruder, the port of export of described Passivation Treatment device is provided with core-spun yarn unit, pure calcium core-spun yarn to be processed sequentially passes through heater, extruder, Passivation Treatment device and core-spun yarn unit, wherein, above-mentioned ectrusion press is in calcium pump is squeezed into calcium silk, Passivation Treatment device is for being passivated calcium silk processing；The top of described Passivation Treatment device is additionally provided with an inlet, is used for putting passivating solution in this Passivation Treatment device。Described automatic filling mechanism includes pressure transducer, electromagnetic valve, passivation liquid pump and control unit, the liquid outlet of described passivation liquid pump is connected by a liquid-transport pipe-line with the inlet on described Passivation Treatment device top, being provided with an electromagnetic valve on this liquid-transport pipe-line, this electromagnetic valve is Unidirectional solenoid valve；Described pressure transducer is arranged on the inlet place on described Passivation Treatment device top, the signal output part of described pressure transducer is connected with the input of described control unit, the switch of described passivation liquid pump is connected with the outfan of described control unit, and the liquid inlet of this passivation liquid pump is connected with passivating solution fluid reservoir by pipeline。
Further, arrival end and the port of export of described Passivation Treatment device all adopt sealing connecting hose。
A kind of production method being passivated pure calcium core-spun yarn of the present invention, the steps include:
Step one, passivating solution preparation
Methyl-silicone oil and Pulvis Talci are weighed according to percentage by weight respectively 85-95% and 5-15%, load weighted methyl-silicone oil and Pulvis Talci are placed in high-speed stirred still and stir 20-30 minute, obtain required passivating solution, and be loaded into Passivation Treatment device and passivating solution fluid reservoir；
Step 2, calcium pump heating and extruding filamentation
Start the production system being passivated pure calcium core-spun yarn, pending pure calcium pump adopt heater be heated processing, extrusion process is carried out when being placed on extruder after calcium pump heating to plastic extrusion forming temperature, it is made to be squeezed into the calcium metal silk of Ф 6-8mm, the mass fraction 98% of Ca in gained calcium silk；
Step 3, calcium silk Passivation Treatment
Making the calcium metal silk obtained in step 2 be entered the Passivation Treatment device being full of passivating solution by the arrival end of Passivation Treatment device, be passivated calcium metal silk processing, the calcium silk surface-coated after passivated process has one layer of passivating film and the port of export by Passivation Treatment device to leave；Wherein: on Passivation Treatment device, be provided with automatic filling mechanism, this automatic filling mechanism is for automatic filling passivating solution in Passivation Treatment device, making to remain in Passivation Treatment device full passivating solution；
Step 4, calcium silk cladding process
Calcium metal silk after Passivation Treatment in step 3 adopt mild-carbon steel strip carry out cladding process on core-spun yarn unit so that it is be overmolding to alloy claded wire。
Further, in step one, the basicity PH of gained passivating solution is 6-7。
Further, in step 3, the thickness of the passivating film on calcium silk surface after passivated process is 0.1-0.25mm。
Further, in step 4, calcium silk cladding processes the thickness of mild-carbon steel strip used is 0.34-0.45mm。
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, have the advantages that
(1) a kind of production system being passivated pure calcium core-spun yarn of the present invention, including heater, extruder, core-spun yarn unit and Passivation Treatment device, the arrival end of above-mentioned Passivation Treatment device is positioned at the discharge end of extruder, the port of export of Passivation Treatment device is provided with core-spun yarn unit, pure calcium pump heated extruding filamentation to be processed laggard enter Passivation Treatment device be passivated process, then carry out cladding process again through core-spun yarn unit。Owing to the calcium silk surface-coated being passivated in Passivation Treatment device after processing has one layer of passivating film; can effectively completely cut off contacting of its surface and the oxygen in air and water in calcium metal silk cladding process; thus protecting calcium metal silk not oxidized; reduce the calcium loss in production process, it is ensured that in heart yearn, the grade of Ca meets the prescription of product。Simultaneously, in line feeding use procedure, namely molten steel process is fed at core-spun yarn through slag blanket, vaporization, a course of reaction is had because of calcium metal silk surface passivation layer after contacting with high-temperature molten steel, thus the too early scaling loss of calcium metal and gasification loss in delayed core-spun yarn, slow down boiling and expulsion events that calcium and molten steel intense reaction cause, decrease the generation of calcium loss and security incident, substantially increase the recovery rate in molten steel of the calcium in core-spun yarn。
(2) a kind of production system being passivated pure calcium core-spun yarn of the present invention also includes automatic filling mechanism, this automatic filling mechanism includes pressure transducer, electromagnetic valve, passivation liquid pump and control unit, the liquid outlet of above-mentioned passivation liquid pump is connected by a liquid-transport pipe-line with the inlet on Passivation Treatment device top, is provided with an electromagnetic valve on this liquid-transport pipe-line；Above-mentioned pressure transducer is arranged on the inlet place on Passivation Treatment device top, and the signal output part of pressure transducer is connected with the input of control unit, the above-mentioned switch of passivation liquid pump is connected with the outfan of control unit, and the liquid inlet of this passivation liquid pump is connected with passivating solution fluid reservoir by pipeline。Above-mentioned pressure transducer can measure the pressure change in Passivation Treatment device in real time, when the pressure in the Passivation Treatment device that it is surveyed is lower than setting value (setting value that pressure when being full of passivating solution in Passivation Treatment device is pressure), namely signal is sent by the signal output part of pressure transducer to control unit, control unit controls the switch of passivation liquid pump makes it open, namely passivating solution is flowed out via passivation liquid pump by passivating solution fluid reservoir, and when passivating solution flows through electromagnetic valve, under the pressure effect of passivating solution, the switch of electromagnetic valve is opened, passivating solution is made to flow to Passivation Treatment device；And when being full of passivating solution in Passivation Treatment device, the pressure in Passivation Treatment device measured by pressure transducer reaches setting value, and now, namely pressure transducer sends signal to control unit, thus the switch controlling passivation liquid pump makes it cut out。By the above control process being passivated in the production system of pure calcium core-spun yarn automatic filling mechanism, namely the pressure monitoring in Passivation Treatment device in real time can be realized, and automatically control the content of passivating solution in Passivation Treatment device and make Passivation Treatment device remains the state of full passivating solution, thus significantly having stopped contacting of passivating solution and air in Passivation Treatment device, the passivation effect making calcium silk is ensured further, improve the recovery rate of calcium in molten steel, and greatly reduce the labor intensity of workman, save cost。
The liquid outlet connecting passivation liquid pump in the present invention is Unidirectional solenoid valve with the electromagnetic valve of installation on the liquid-transport pipe-line of the inlet on Passivation Treatment device top, on the one hand, this Unidirectional solenoid valve can only allow passivating solution to be flowed to Passivation Treatment device by passivating solution fluid reservoir, and passivating solution can not be allowed to be flowed to passivating solution fluid reservoir by Passivation Treatment device, such that it is able to prevent because passivating solution makes passivation liquid pump scaling loss to passivating solution pump reflux；On the other hand, when Passivation Treatment device is full of passivating solution, Unidirectional solenoid valve is closed, it is possible to Passivation Treatment device is played sealing function, such that it is able to prevent the decline of the calcium silk passivation effect caused due to the passivating solution in Passivation Treatment device and air contact further。
(3) in the present invention, the arrival end of Passivation Treatment device and the port of export all adopt connecting hose, will not produce dilatation, make the effect of passivating solution air-isolation in Passivation Treatment device better, such that it is able to reduce the oxidation of calcium silk further。
(4) calcium silk is passivated process passivating solution used by the present invention be made up of methyl-silicone oil and Pulvis Talci, it is little that this passivating solution has surface tension, the advantages such as tack is good, not volatile, hydrophobicity good, heat-resist, good in oxidation resistance, and it is not moisture in this passivating solution, the dissolving of air can be reduced, such that it is able to strengthen the Passivation Treatment effect to calcium silk, and do not affect processing and the use of calcium metal silk。
(5) in the present invention, the thickness of the passivating film on calcium silk surface after passivated process is 0.1-0.25mm, the thinner thickness of passivating film, thus in molten steel, the recovery rate impact of calcium is less during on wire feeding process。
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of existing calcium metal filament core-spun wire production system；
Fig. 2 is the overall structure schematic diagram of a kind of production system being passivated pure calcium core-spun yarn in the present invention；
Fig. 3 is the structural representation of the automatic filling mechanism in the present invention。
Label declaration in schematic diagram:
1, heater；2, extruder；3, Passivation Treatment device；4, pressure transducer；5, electromagnetic valve；6, passivation liquid pump；7, steel band；8, core-spun yarn unit；9, calcium filament core-spun wire finished product。
Detailed description of the invention
For further appreciating that present disclosure, in conjunction with drawings and Examples, the present invention is described in detail。
Embodiment 1
As in figure 2 it is shown, a kind of production system being passivated pure calcium core-spun yarn of the present embodiment, including heater 1, extruder 2, core-spun yarn unit 8, Passivation Treatment device 3 and automatic filling mechanism。Wherein, above-mentioned heater 1 is positioned at the feed end of extruder 2, the arrival end of above-mentioned Passivation Treatment device 3 is positioned at the discharge end of extruder 2, the port of export of this Passivation Treatment device 3 is provided with core-spun yarn unit 8, pure calcium core-spun yarn to be processed sequentially passes through heater 1, extruder 2, Passivation Treatment device 3 and core-spun yarn unit 8, wherein, above-mentioned extruder 2 for being squeezed into calcium silk by calcium pump, and Passivation Treatment device 3 is for being passivated calcium silk processing。Being provided with an inlet on the top of Passivation Treatment device 3, the entrance point of this Passivation Treatment device 3 and the port of export all adopt sealing connecting hose, and are used for putting passivating solution in this Passivation Treatment device 3；As shown in Figure 3, automatic filling mechanism in the present embodiment includes pressure transducer 4, electromagnetic valve 5, passivation liquid pump 6 and control unit, the liquid outlet of above-mentioned passivation liquid pump 6 is connected by a liquid-transport pipe-line with the inlet on Passivation Treatment device 3 top, this liquid-transport pipe-line is provided with an electromagnetic valve 5, and this electromagnetic valve 5 is Unidirectional solenoid valve；Above-mentioned pressure transducer 4 is arranged on the inlet place on Passivation Treatment device 3 top, and the signal output part of this pressure transducer 4 is connected with the input of control unit；The above-mentioned switch of passivation liquid pump 6 is connected with the outfan of control unit, and the liquid inlet of this passivation liquid pump 6 is connected with passivating solution fluid reservoir by pipeline。
In the present embodiment, pending pure calcium pump adopts heater 1 be heated processing, carries out extrusion process when being placed on extruder 2 after calcium pump heating to plastic extrusion forming temperature, according to needs of production so that it is be squeezed into diameter and be about the calcium metal silk of 6mm；Above-mentioned extruded after calcium metal silk by Passivation Treatment device 3 arrival end enter be full of passivating solution Passivation Treatment device 3, it is passivated calcium metal silk processing, passivating film that the calcium silk surface-coated after passivated process has a layer thickness to be 0.15mm and being left by the port of export of Passivation Treatment device 3；Adopting mild-carbon steel strip 7 to carry out cladding process on core-spun yarn unit 8 the calcium metal silk after above-mentioned passivated process so that it is to be overmolding to calcium filament core-spun wire finished product 9, it is 0.34mm that calcium silk cladding processes the thickness of mild-carbon steel strip used。Owing to the calcium silk surface-coated after passivated process has one layer of passivating film; can effectively completely cut off contacting of its surface and the oxygen in air and water in calcium metal silk cladding process; thus protecting calcium metal silk not oxidized; reduce the calcium loss in production process, it is ensured that in heart yearn, the grade of Ca meets the prescription of product。Simultaneously, in line feeding use procedure, namely molten steel process is fed at core-spun yarn through slag blanket, vaporization, a course of reaction is had because of calcium metal silk surface passivation layer after contacting with high-temperature molten steel, thus the too early scaling loss of calcium metal and gasification loss in delayed core-spun yarn, slow down boiling and expulsion events that calcium and molten steel intense reaction cause, decrease the generation of calcium loss and security incident, substantially increase the recovery rate in molten steel of the calcium in core-spun yarn。In addition; calcium metal silk is passivated process passivating solution used be made up of methyl-silicone oil and Pulvis Talci; in this passivating solution not moisture; the dissolving of air can be reduced, such that it is able to strengthen the Passivation Treatment effect to calcium silk, simultaneously; the key component methyl-silicone oil of passivating solution has excellent thermostability, chemical inertness and non-oxidizability; so that passivating film can uniformly, be securely attached to calcium silk surface, greatly strengthen the oxidation protection to calcium silk, and do not affect processing and the use of calcium metal silk。
In the present embodiment in the Passivation Treatment process of calcium silk, the pressure change that the pressure transducer being arranged on the inlet place on Passivation Treatment device 3 top can be monitored in Passivation Treatment device in real time, when the pressure in the Passivation Treatment device that it is surveyed is lower than setting value (setting value that pressure when being full of passivating solution in Passivation Treatment device is pressure), namely signal is sent by the signal output part of pressure transducer to control unit, control unit controls the switch of passivation liquid pump makes it open, namely passivating solution is flowed out via passivation liquid pump by passivating solution fluid reservoir, and when passivating solution flows through electromagnetic valve, under the pressure effect of passivating solution, the switch of electromagnetic valve is opened, passivating solution is made to flow to Passivation Treatment device；And when being full of passivating solution in Passivation Treatment device, the pressure in Passivation Treatment device measured by pressure transducer reaches setting value, and now, namely pressure transducer sends signal to control unit, thus the switch controlling passivation liquid pump makes it cut out。By controlling process above, namely the pressure monitoring in Passivation Treatment device in real time can be realized, and automatically control the content of passivating solution in Passivation Treatment device and make Passivation Treatment device remains the state of full passivating solution, thus significantly having stopped contacting of passivating solution and air in Passivation Treatment device, the passivation effect making calcium silk is ensured further, improves the recovery rate of calcium in molten steel。
In the present embodiment, the electromagnetic valve in automatic filling mechanism is Unidirectional solenoid valve, on the one hand, this Unidirectional solenoid valve can only allow passivating solution to be flowed to Passivation Treatment device by passivating solution fluid reservoir, and passivating solution can not be allowed to be flowed to passivating solution fluid reservoir by Passivation Treatment device, such that it is able to prevent because passivating solution makes passivation liquid pump scaling loss to passivating solution pump reflux；On the other hand, when Passivation Treatment device is full of passivating solution, Unidirectional solenoid valve is closed, it is possible to Passivation Treatment device is played sealing function, such that it is able to prevent the decline of the calcium silk passivation effect caused due to the passivating solution in Passivation Treatment device and air contact further。In the present embodiment, the arrival end of Passivation Treatment device and the port of export all adopt sealing connecting hose, will not produce dilatation, make the effect of passivating solution air-isolation in Passivation Treatment device better, such that it is able to reduce the oxidation of calcium silk further。
A kind of production method being passivated pure calcium core-spun yarn of the present embodiment, the steps include:
Step one, passivating solution preparation
Methyl-silicone oil and Pulvis Talci respectively 85% and 15% are weighed according to percentage by weight, load weighted methyl-silicone oil and Pulvis Talci are placed in high-speed stirred still and stir 20 minutes, obtain required passivating solution, and it being loaded into Passivation Treatment device 3 and passivating solution fluid reservoir, the basicity PH of gained passivating solution is 7；
Step 2, calcium pump heating and extruding filamentation
Start the production system being passivated pure calcium core-spun yarn, pending pure calcium pump adopt heater 1 be heated processing, extrusion process is carried out when being placed on extruder 2 after calcium pump heating to plastic extrusion forming temperature, it is made to be squeezed into the calcium metal silk of Ф 6mm, the mass fraction 98% of Ca in gained calcium silk；
Step 3, calcium silk Passivation Treatment
The calcium metal silk obtained in step 2 is made to be entered the Passivation Treatment device 3 being full of passivating solution by the arrival end of Passivation Treatment device 3, it is passivated calcium metal silk processing, calcium silk surface-coated after passivated process has one layer of passivating film and the port of export by Passivation Treatment device 3 to leave, and the thickness of the passivating film on this calcium silk surface is 0.15mm；Meanwhile, Passivation Treatment device 3 being provided with automatic filling mechanism, this automatic filling mechanism is for automatic filling passivating solution in Passivation Treatment device 3, making to remain in Passivation Treatment device 3 full passivating solution；
Step 4, calcium silk cladding process
Calcium metal silk after Passivation Treatment in step 3 adopting mild-carbon steel strip carry out cladding process on core-spun yarn unit 8 so that it is be overmolding to alloy claded wire, it is 0.34mm that calcium silk cladding processes the thickness of mild-carbon steel strip used。
From the present embodiment passivated process and cladding process after pure calcium core-spun yarn heart yearn on take 1m sample, the online respectively and Ca content that detects after 3 days in heart yearn, its result such as table 1。And the pure calcium core-spun yarn after process passivated in the present embodiment and cladding being processed is used for molten steel wire feeding process, the molten steel in the present embodiment is the molten steel of 120 tons of SPHC steel grades, and the line feeding amount of calcium line is at 450m。
Comparative example 1
This comparative example adopts the calcium line produced with existing calcium filament core-spun wire production technology, 1m sample is taken from this calcium line, Ca content that is online respectively and that detect after 3 days in heart yearn, its result such as table 1, and use it for molten steel wire feeding process, molten steel in the present embodiment is the molten steel of 120 tons of SPHC steel grades, and the line feeding amount of calcium line is at 450m。
Table 1 adopts the core-spun yarn and the contrast of existing technique core-spun yarn index that in embodiment 1, pure calcium core-spun yarn production method produces
By table 1 adopting the core-spun yarn being passivated the production of pure calcium core-spun yarn production method in embodiment 1 and the contrast of existing technique core-spun yarn index can be seen that, core-spun yarn relative to existing explained hereafter, adopt in embodiment 1 and be passivated the online calcium content of core-spun yarn that pure calcium core-spun yarn production method produces and the calcium content after 3 days is all increased, and adopt the proportion of goods damageds being passivated the calcium after the core-spun yarn that pure calcium core-spun yarn production method produces is placed 3 days in embodiment 1 substantially to be reduced。By to the observation contrast of calcium line wire feeding process process in embodiment 1 and comparative example 1, the calcium line produced in embodiment 1 is used to carry out in line feeding process, boiling and the expulsion events of molten steel are obviously reduced, and the recovery rate of Ca is 25% in steel, improve 2% than the calcium metal filament core-spun wire being provided without Passivation Treatment, reduce steel mill's Calcium treatment cost。
Embodiment 2
A kind of production method being passivated pure calcium core-spun yarn of the present embodiment, the steps include:
Step one, passivating solution preparation
Methyl-silicone oil and Pulvis Talci respectively 90% and 10% are weighed according to percentage by weight, load weighted methyl-silicone oil and Pulvis Talci are placed in high-speed stirred still and stir 30 minutes, obtain required passivating solution, and it being loaded into Passivation Treatment device 3 and passivating solution fluid reservoir, the basicity PH of gained passivating solution is 6.5；
Step 2, calcium pump heating and extruding filamentation
Start the production system being passivated pure calcium core-spun yarn, pending pure calcium pump adopt heater 1 be heated processing, extrusion process is carried out when being placed on extruder 2 after calcium pump heating to plastic extrusion forming temperature, it is made to be squeezed into the calcium metal silk of Ф 7mm, the mass fraction 98% of Ca in gained calcium silk；
Step 3, calcium silk Passivation Treatment
The calcium metal silk obtained in step 2 is made to be entered the Passivation Treatment device 3 being full of passivating solution by the arrival end of Passivation Treatment device 3, it is passivated calcium metal silk processing, calcium silk surface-coated after passivated process has one layer of passivating film and the port of export by Passivation Treatment device 3 to leave, and the thickness of the passivating film on this calcium silk surface is 0.1mm；Meanwhile, Passivation Treatment device 3 being provided with automatic filling mechanism, this automatic filling mechanism is for automatic filling passivating solution in Passivation Treatment device 3, making to remain in Passivation Treatment device 3 full passivating solution；
Step 4, calcium silk cladding process
Calcium metal silk after Passivation Treatment in step 3 adopting mild-carbon steel strip carry out cladding process on core-spun yarn unit 8 so that it is be overmolding to alloy claded wire, it is 0.45mm that calcium silk cladding processes the thickness of mild-carbon steel strip used。
From the present embodiment passivated process and cladding process after pure calcium core-spun yarn heart yearn on take 1m sample, Ca content that is respectively online and that detect after 3 days in heart yearn, its online and after 3 days the Ca content in heart yearn and its place 3 days after Ca loss all with employing embodiment 1 in table 1 in be passivated pure calcium core-spun yarn the calcium filament core-spun wire of production method production close。Pure calcium core-spun yarn after process passivated in the present embodiment and cladding being processed is used for molten steel wire feeding process, molten steel in the present embodiment is the molten steel of 120 tons of SPHC steel grades, the line feeding amount of calcium line is at 450m, relative to the core-spun yarn using existing explained hereafter, boiling and the expulsion events of molten steel are all obviously reduced, and in steel, the recovery rate of Ca is provided without the calcium metal filament core-spun wire of Passivation Treatment and improves 1%。
Embodiment 3
A kind of production method being passivated pure calcium core-spun yarn of the present embodiment, the steps include:
Step one, passivating solution preparation
Methyl-silicone oil and Pulvis Talci respectively 95% and 5% are weighed according to percentage by weight, load weighted methyl-silicone oil and Pulvis Talci are placed in high-speed stirred still and stir 25 minutes, obtain required passivating solution, and it being loaded into Passivation Treatment device 3 and passivating solution fluid reservoir, the basicity PH of gained passivating solution is 6；
Step 2, calcium pump heating and extruding filamentation
Start the production system being passivated pure calcium core-spun yarn, pending pure calcium pump adopt heater 1 be heated processing, extrusion process is carried out when being placed on extruder 2 after calcium pump heating to plastic extrusion forming temperature, it is made to be squeezed into the calcium metal silk of Ф 8mm, the mass fraction 98% of Ca in gained calcium silk；
Step 3, calcium silk Passivation Treatment
The calcium metal silk obtained in step 2 is made to be entered the Passivation Treatment device 3 being full of passivating solution by the arrival end of Passivation Treatment device 3, it is passivated calcium metal silk processing, calcium silk surface-coated after passivated process has one layer of passivating film and the port of export by Passivation Treatment device 3 to leave, and the thickness of the passivating film on this calcium silk surface is 0.25mm；Meanwhile, Passivation Treatment device 3 being provided with automatic filling mechanism, this automatic filling mechanism is for automatic filling passivating solution in Passivation Treatment device 3, making to remain in Passivation Treatment device 3 full passivating solution；
Step 4, calcium silk cladding process
Calcium metal silk after Passivation Treatment in step 3 adopting mild-carbon steel strip carry out cladding process on core-spun yarn unit 8 so that it is be overmolding to alloy claded wire, it is 0.4mm that calcium silk cladding processes the thickness of mild-carbon steel strip used。
From the present embodiment passivated process and cladding process after pure calcium core-spun yarn heart yearn on take 1m sample, Ca content that is respectively online and that detect after 3 days in heart yearn, its online and after 3 days the Ca content in heart yearn and its place 3 days after Ca loss all with employing embodiment 1 in table 1 in be passivated pure calcium core-spun yarn the calcium filament core-spun wire of production method production close。Pure calcium core-spun yarn after process passivated in the present embodiment and cladding being processed is used for molten steel wire feeding process, molten steel in the present embodiment is the molten steel of 120 tons of SPHC steel grades, the line feeding amount of calcium line is at 450m, relative to the core-spun yarn using existing explained hereafter, boiling and the expulsion events of molten steel are all obviously reduced, and in steel, the recovery rate of Ca is provided without the calcium metal filament core-spun wire of Passivation Treatment and improves 2.5%。
Therefore, a kind of production system being passivated pure calcium core-spun yarn in the application of the invention and production method thereof, the Passivation Treatment efficiency that can make calcium line is greatly improved, reduce calcium line oxidation loss in extruding filamentation and cladding processing procedure, so that the recovery rate of calcium increases in molten steel, ensure that the effect of iron and steel external refining, and the labor intensity of workman can be substantially reduced, save cost。
Schematically the present invention and embodiment thereof being described above, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited thereto。So, if those of ordinary skill in the art is enlightened by it, when without departing from the invention objective, design the frame mode similar to this technical scheme and embodiment without creationary, protection scope of the present invention all should be belonged to。
Claims (2)
1. the production system being passivated pure calcium core-spun yarn, including heater (1), extruder (2) and core-spun yarn unit (8), it is characterized in that: also include Passivation Treatment device (3) and automatic filling mechanism, wherein, described heater (1) is positioned at the feed end of described extruder (2), the arrival end of described Passivation Treatment device (3) is positioned at the discharge end of described extruder (2), the port of export of described Passivation Treatment device (3) is provided with core-spun yarn unit (8), pure calcium pump to be processed sequentially passes through heater (1), extruder (2), Passivation Treatment device (3) and core-spun yarn unit (8), above-mentioned extruder (2) for being squeezed into calcium silk by calcium pump, Passivation Treatment device (3) is for being passivated calcium silk processing, the top of described Passivation Treatment device (3) is additionally provided with an inlet, it is used for putting passivating solution in this Passivation Treatment device (3)；
Described automatic filling mechanism includes pressure transducer (4), electromagnetic valve (5), passivation liquid pump (6) and control unit, the liquid outlet of described passivation liquid pump (6) is connected by a liquid-transport pipe-line with the inlet on described Passivation Treatment device (3) top, being provided with an electromagnetic valve (5) on this liquid-transport pipe-line, this electromagnetic valve (5) is Unidirectional solenoid valve；Described pressure transducer (4) is arranged on the inlet place on described Passivation Treatment device (3) top, the described signal output part of pressure transducer (4) is connected with the input of described control unit, the switch of described passivation liquid pump (6) is connected with the outfan of described control unit, and the liquid inlet of this passivation liquid pump (6) is connected with passivating solution fluid reservoir by pipeline。
2. a kind of production system being passivated pure calcium core-spun yarn according to claim 1, it is characterised in that: arrival end and the port of export of described Passivation Treatment device (3) all adopt sealing connecting hose。
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| CN201510145424.1A CN104711392B (en) | 2015-03-27 | 2015-03-27 | A kind of production system being passivated pure calcium core-spun yarn |
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| CN204509382U (en) * | 2015-03-27 | 2015-07-29 | 马鞍山市兴达冶金新材料有限公司 | The production system of the pure calcium core-spun yarn of a kind of passivation |
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