CN107083470B - Seamless pure calcium core-spun yarn and production system thereof - Google Patents

Seamless pure calcium core-spun yarn and production system thereof Download PDF

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CN107083470B
CN107083470B CN201710373599.7A CN201710373599A CN107083470B CN 107083470 B CN107083470 B CN 107083470B CN 201710373599 A CN201710373599 A CN 201710373599A CN 107083470 B CN107083470 B CN 107083470B
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calcium
coating
wire
cored wire
seamless
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CN107083470A (en
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李国安
王建国
李寿全
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Maanshan Xingda Metallurgical New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
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    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract

The invention discloses a seamless pure calcium core-spun yarn and a production system thereof, belonging to the technical field of alloy core-spun yarns. The invention relates to a seamless pure calcium cored wire, which consists of an inner core calcium wire and a nano ceramic coating uniformly coated on the surface of the inner core calcium wire. The invention relates to a production system of a seamless pure calcium core-spun yarn, which comprises a heating device, an extruder, a vacuum coating treatment tank and a curing processor, wherein the heating device, the extruder, the vacuum coating treatment tank and the curing processor are sequentially arranged, a calcium rod is heated through the heating device and then extruded through the extruder to form a metal calcium wire, the formed metal calcium wire is directly guided into the vacuum coating treatment tank, a layer of nano ceramic coating is uniformly coated on the surface of the calcium wire, and the curing processor is used for curing. By adopting the technical scheme of the invention, the yield of calcium in molten steel can be effectively improved, the rejection rate of the obtained product is obviously reduced, and the production efficiency and the use effect of the product are favorably improved.

Description

Seamless pure calcium core-spun yarn and production system thereof
Technical Field
The invention belongs to the technical field of core-spun yarns, and particularly relates to a seamless pure calcium core-spun yarn and a production system thereof.
Background
With the progress of steel-making technology, especially the development of molten steel refining technology, it has become possible to produce high-purity, high-quality and high-grade steel. The low-carbon aluminum killed steel and steel grades with extremely high purity requirements mainly adopt an LF-VD or RH furnace to refine molten steel and adopt a wire feeding mode to deform inclusions in the molten steel, thereby further improving the purity of the molten steel and improving the castability of the molten steel. At present, the alloy wires widely used in steel mills are mainly iron calcium wires, silicon calcium wires, solid pure calcium wires and aluminum calcium wires.
The traditional cored wire is mainly made of core powder or wire, and the outer layer is coated with a steel belt. However, the cored wire is formed by wrapping a steel belt by a cored wire rolling unit and then folding, locking and pressing the steel belt by a rolling wheel, seamless sealing of the outer steel belt cannot be realized, and calcium in the inner core powder is easily oxidized and loses efficacy or the calcium content grade is reduced in long-time storage in a high-temperature and humid environment, so that the use effect is influenced. In addition, in the using process, if the quality of the outer layer steel belt is poor, the quality defect exists, the wire breakage is easy to occur in the wire feeding process, and the production rhythm and the wire feeding treatment effect are influenced. Meanwhile, the thickness of the outer layer steel strip of the existing cored wire is only 0.35-0.4mm, so that the outer layer steel strip of the cored wire is easy to soften during wire feeding and cannot reach the critical depth of molten steel, and partial calcium metal runs away in a calcium steam mode before reaction, so that the yield of calcium is only 10-25%; the molten steel is easy to splash in the wire feeding process due to the violent reaction, so that the use of the traditional cored wire is limited, and the cost reduction of a steel mill is not facilitated.
In recent two years, steel mills have tried to introduce a seamless pure calcium wire production technology from abroad, and a structural schematic diagram of a conventional seamless pure calcium wire production system is shown in fig. 1, wherein a calcium rod 1 is heated by a heating device 2 and then is extruded and formed into a calcium wire 4 by an extruder 3, the calcium wire 4 and a strip steel 5 in a storage bin 6 enter a wire wrapping unit 7 together, the strip steel 5 is wrapped on the surface of the calcium wire 4, then the strip steel 5 is welded by a high-frequency or laser welding machine 8, the welded cored wire is placed in a heat treatment furnace 9 for heat treatment, and finally, the cored wire is rewound by a rewinding machine 10 to form a finished cored wire 11. The existing seamless pure calcium wire usually adopts a steel band with the thickness of 0.9-1.0mm to coat metal calcium wires, and high-frequency or laser welding is adopted between the coated steel bands, so that the outer layer steel band can be completely coated in a seamless way, and when the core-spun wire is used under extreme conditions such as high temperature and humid environment, the calcium wires at the inner core are not easy to contact with air to cause calcium oxidation failure or calcium grade reduction. Meanwhile, in the use process, the seamless line has better rigidity, can penetrate through a slag layer to feed molten steel to a critical depth, avoids premature burning loss and gasification loss of calcium, has small splashing of the molten steel, and has the yield of the calcium of more than 30 percent.
For example, the application with the Chinese patent application number of 201210005971.6 discloses a seamless solid calcium metal cored wire for steelmaking deoxidization and a preparation method thereof, the cored wire of the application consists of an outer-layer steel pipe, a middle coating and an inner core, the sealing performance of the inner core coating is improved through the arrangement of the outer-layer seamless steel pipe, and the oxidation failure of calcium is favorably reduced; and the vapor pressure and the gasification speed of the calcium metal are reduced through the arrangement of the middle coating, so that the depth of the seamless solid calcium metal cored wire inserted into the molten steel is increased, and the boiling of the molten steel is reduced.
However, the seamless pure calcium wire is still in a groping stage in domestic production technology, one-time investment of equipment is large, production technical requirements are high, the process is complex, the speed of a cored wire cladding unit is not matched with the speed of high-frequency laser welding, the control requirements of parameters such as high-frequency laser welding frequency, temperature and the like are extremely high, and therefore the finished product quality qualification rate is low, the rejection rate is up to 35-40%, the yield is low, and the production cost is high. In addition, the thickness of the steel belt is about 0.9-1.0mm, the surface hardness of the produced core-spun yarn is high, and the yarn is easy to slip and feed during the yarn feeding process of the yarn feeding machine in a steel mill, so that the production is influenced.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects of the existing cored wire and provides a seamless pure calcium cored wire. When the seamless pure calcium cored wire is adopted to treat molten steel, the yield of calcium metal can be effectively ensured, and the phenomena of wire breakage and gasification loss of the cored wire are avoided.
The invention also aims to overcome the defects of the existing seamless pure calcium core-spun yarn, and provides a production system of the seamless pure calcium core-spun yarn.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a seamless pure calcium cored wire which is composed of an inner core calcium wire and a nano ceramic coating uniformly coated on the surface of the inner core calcium wire.
Furthermore, the diameter of the cored wire is 9-13mm, the diameter of the inner core calcium wire is 8.7-12.9mm, and the thickness of the nano ceramic coating is 0.15-0.25mm.
Furthermore, the coating of the nano ceramic coating is made of SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicone resins, of which SiO is 2 、Al 2 O 3 TiO 40-60 wt%, 25-35 wt%, 15-25 wt%, nanometer silica sol and nanometer Al 2 O 3 And the addition amount of the modified silicon resin is 20-25%, 5-10% and 10-15% of the total weight of the ceramic powder respectively.
Furthermore, the paint of the nano ceramic coating is added with absolute ethyl alcohol and acetone as solvents, and polyacrylamide as a thickening agent.
Furthermore, the addition amounts of the absolute ethyl alcohol, the acetone and the polyacrylamide respectively account for 25-30%, 5-15% and 0.1-0.5% of the total weight of the coating.
Furthermore, the granularity of the ceramic powder in the nano ceramic coating is 800-1000 meshes, and the pH value of the obtained nano ceramic coating is 7-9.
The invention discloses a production system of a seamless pure calcium core-spun yarn, which comprises a heating device, an extruder, a vacuum coating treatment tank and a curing processor, wherein the heating device, the extruder, the vacuum coating treatment tank and the curing processor are sequentially arranged, the heating device is used for heating a calcium rod, the extruder is used for extruding the heated calcium rod to form a metal calcium wire, the vacuum coating treatment tank is used for uniformly coating a layer of nano ceramic coating on the surface of the calcium wire, and the curing processor is used for curing the nano ceramic coating on the surface of the calcium wire, so that the seamless pure calcium core-spun yarn is obtained.
Furthermore, a sizing mill and a rewinding machine are sequentially arranged at the outlet end of the curing processor, and a hot air device is arranged on the side of the curing processor.
Furthermore, the vacuum coating treatment tank is filled with nano ceramic coating which is SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicone resin, absolute ethyl alcohol and acetone are used as solvents, and polyacrylamide is used as a thickening agent.
Furthermore, the vacuum coating treatment tank is connected with the liquid storage device through a liquid inlet pipeline, a liquid level meter is arranged in the vacuum coating treatment tank, a liquid inlet pump and a control valve are arranged on the liquid inlet pipeline, and the liquid level meter, the liquid inlet pump and the control valve are all connected with a control system.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The seamless pure calcium cored wire disclosed by the invention is composed of the inner core calcium wire and the nano ceramic coating uniformly coated on the surface of the inner core calcium wire, and the nano ceramic coating is coated on the surface of the inner core calcium wire, so that the oxidation failure, the premature burning loss and the gasification loss of calcium can be effectively prevented, and the yield of calcium in molten steel can be increased.
(2) According to the seamless pure calcium core-spun yarn, the outer layer of the inner core calcium wire is not required to be coated with a steel belt, the production process of the existing seamless and seamless pure calcium core-spun yarn is greatly simplified, a complex mechanical rolling wire-wrapping machine set and equipment such as high-frequency laser welding, burr polishing after steel belt welding, heat treatment, rewinding finishing after welding and the like are omitted, the production process is relatively simple, the rejection rate of obtained products is effectively reduced, and the production efficiency and the storage period of the core-spun yarn are improved.
(3) The seamless pure calcium cored wire provided by the invention has the advantages that the components and the proportion of the nano ceramic coating are optimally designed, so that the coating has higher softening temperature and melting point (the melting point is 1450-1500 ℃, the melting temperature of a steel strip is only 1250-1350 ℃), the core wire does not soften too early when the wire is fed into high-temperature molten steel, and the phenomenon that the wire cannot reach the critical depth of the molten steel or the molten steel is melted too early to cause calcium gasification loss or the molten steel is splashed too much due to violent calcium reaction is prevented. Because the specific gravity of the liquid silicate formed after the surface coating of the metal calcium wire is melted is far less than that of the molten steel, the liquid silicate can quickly float on the surface of the molten steel to form a liquid slag layer, and therefore, the molten steel is not polluted.
(4) According to the seamless pure calcium cored wire, the thickness of the nano ceramic coating and the granularity of the nano ceramic are effectively controlled, so that the tensile strength and the bending times of the cored wire can be effectively improved on the basis of effectively ensuring the yield of calcium in molten steel, and the surface coating is not easy to crack or fall off; meanwhile, compared with the existing seamless and seamless cored wires, the seamless pure calcium cored wire has better wear resistance and oxidation resistance.
(5) The invention relates to a production system of a seamless pure calcium core-spun yarn, which comprises a heating device, an extruder, a vacuum coating treatment tank and a curing processor which are sequentially arranged, wherein the heating device is used for heating a calcium rod, the extruder is used for extruding the calcium rod to form a metal calcium wire, the formed metal calcium wire is directly introduced into the vacuum coating treatment tank, the surface of the calcium wire is uniformly coated with a layer of nano ceramic coating, and the curing processor is used for curing. The production system can be used for producing the seamless pure calcium core-spun yarn coated with the nano ceramic coating, and when the obtained core-spun yarn is used for molten steel refining treatment, the oxidation and gasification loss of calcium can be effectively reduced, and the yield of calcium is higher. Meanwhile, the production system is beneficial to reducing the rejection rate of products, improving the yield and the production efficiency, and has simple structure and low cost.
(6) According to the production system of the seamless pure calcium cored wire, the outlet end of the curing processor is provided with the sizing mill, so that the cored wire can be processed into a product with the required coating thickness, the hot air device is further arranged on the side of the curing processor, and the curing efficiency and the curing effect of the coating on the surface of the calcium wire inner core can be improved through hot air treatment.
(7) According to the production system of the seamless pure calcium core-spun yarn, the vacuum coating treatment tank is connected with the liquid storage device through the liquid inlet pipeline, the liquid level meter is arranged in the vacuum coating treatment tank, the liquid inlet pump and the control valve are arranged on the liquid inlet pipeline, and the liquid level meter, the liquid inlet pump and the control valve are all connected with the control system, so that the coating liquid level in the vacuum coating treatment tank can be monitored in real time, timely supply is carried out through the liquid inlet pipeline and the liquid storage device, and the uniformity and compact coating of the coating on the surface of the calcium yarn can be guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a conventional seamless pure calcium line production system;
FIG. 2 is a schematic structural view of a seamless pure calcium cored wire production system of the present invention;
FIG. 3 is a schematic view showing the structure of a vacuum coating processing bath according to the present invention;
fig. 4 is a schematic structural view of the seamless pure calcium cored wire of the present invention.
The reference numerals in the schematic drawings illustrate:
1. a calcium rod; 2. a heating device; 3. an extruder; 4. calcium filament; 5. strip steel; 6. a storage bin; 7. a wire wrapping machine set; 8. a high frequency or laser welder; 9. a heat treatment furnace; 10. rewinding machine; 11. the finished product of the cored wire; 12. a vacuum coating treatment tank; 13. a hot air device; 14. a curing processor; 15. a sizing mill; 16. calcium filaments in the inner core; 17. a nano-ceramic coating; 18. a liquid inlet pipeline; 19. a liquid storage device.
Detailed Description
For a further understanding of the invention, reference will now be made in detail to the embodiments illustrated in the drawings.
Example 1
As shown in fig. 4, the seamless pure calcium cored wire of the present embodiment is composed of an inner core calcium wire 16 and a nano ceramic coating 17 uniformly coated on the surface of the inner core calcium wire 16, wherein the diameter of the cored wire is 9mm, and the diameter of the inner core calcium wire 16 is 8.75mm.
The coating of the nano ceramic coating 17 is made of SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicone resin, wherein the particle size of the ceramic powder is 800 meshes and SiO is 2 、Al 2 O 3 And TiO accounting for 40 percent, 35 percent and 25 percent of the total weight of the ceramic powder respectively,nano silica sol, nano Al 2 O 3 And the addition amounts of the modified silicone resin are 20%, 5% and 10% of the total weight of the ceramic powder, respectively. The coating of the nano ceramic coating 17 is further added with absolute ethyl alcohol and acetone as solvents, polyacrylamide as a thickening agent, the addition amounts of the absolute ethyl alcohol, the acetone and the polyacrylamide respectively account for 25%, 5% and 0.1% of the total weight (dry weight) of the coating, and the pH value of the coating is 9.
The traditional cored wire usually takes core powder or core wire as the main part, a cored wire rolling unit is adopted to coat a steel belt on the outer layer, and the steel belt is subjected to edge folding, edge locking and pressing treatment by a rolling wheel, but when the cored wire is adopted to carry out refining treatment on molten steel, the yield of calcium is relatively low, the core wire is easy to break in the wire feeding process, and the wire feeding depth is shallow. With the development of core-spun yarn technology, seamless core-spun yarn has become the research hotspot of researchers at home and abroad at present. In the prior art, steel belts coated on the surface of a core wire are generally welded to obtain a seamless core-spun wire, and the production process can improve the yield of calcium in molten steel to a certain extent, reduce the oxidation loss and gasification loss of the calcium and increase the wire feeding depth of the seamless core-spun wire. However, the quality of the cored wire is greatly influenced by the coating process, the welding quality and the subsequent heat treatment process, and the yield of calcium in molten steel still needs to be further improved. In addition, the steel belt is inevitably coated on the outer layer of the core wire or the core powder in the production of the slotted and seamless core-spun yarn, the generation of waste products is very easy to be caused due to the coating defect of the steel belt, and the rejection rate of the obtained product is relatively high, so that great economic loss is easily caused.
The inventor is always dedicated to the improvement research of the core-spun yarn production process, and finally finds that a layer of nano ceramic coating 17 is uniformly coated on the surface of an inner core calcium wire 16 to replace an alloy core-spun yarn made by coating a metal calcium wire on a traditional mechanical rolling steel strip and the cladding of the traditional mechanical rolling steel strip, and a seamless alloy core-spun yarn made by welding gaps between the steel strips by high-frequency and laser can ensure the complete, compact and uniform seamless sealing of the inner core calcium wire 16, effectively reduce the oxidation loss and gasification loss of calcium, and obviously improve the yield of the calcium in molten steel. In addition, the use requirement of the cored wire can be met without coating the steel belt on the outer layer of the inner core calcium wire 16, the production process is simple, and the influence of steel belt coating on the quality and the use performance of the cored wire is avoided, so that the rejection rate of the obtained product is obviously reduced, and the cost is saved. According to the invention, the nano ceramic coating 17 is directly used for coating the inner core calcium wire 16, the obtained core-spun yarn has good wear resistance and oxidation resistance, the tensile strength is as high as 500MPa, and the bending times are more than 1000, so that the yarn feeding depth of the core-spun yarn can be obviously increased, the yarn is not blocked or broken in the yarn feeding process, the using effect is good, and the yield of calcium in molten steel is high.
The inventor also optimizes and designs the components and the proportion of the nano ceramic coating through a large number of experiments, so that the coating has higher softening temperature and melting point (the melting point is 1450-1500 ℃, and the melting temperature of a steel strip is only 1250-1350 ℃), so that the core wire does not soften too early when the coating is fed into high-temperature molten steel, and the phenomena that the wire feeding does not reach the critical depth of the molten steel or the melting is too early to cause calcium gasification loss or the calcium reaction violently causes the molten steel to splash too much are prevented. Because the specific gravity of the liquid silicate formed after the surface coating of the calcium metal wire is melted is far less than that of the molten steel, the liquid silicate can quickly float on the surface of the molten steel to form a liquid slag layer, and therefore, the molten steel is not polluted. In addition, the granularity of the ceramic powder and the coating thickness of the nano ceramic coating 17 are effectively controlled, so that the tensile strength, the bending times and other properties of the obtained cored wire product can be further ensured, the coating is firmly combined with calcium wires, and the surface coating is not easy to crack or fall off.
Example 2
As shown in fig. 2, the production system of a seamless pure calcium cored wire of the present embodiment includes a heating device 2, an extruder 3, a vacuum coating processing tank 12, and a curing processor 14, wherein the heating device 2, the extruder 3, the vacuum coating processing tank 12, and the curing processor 14 are arranged in this order. The outlet end of the curing processor 14 is also sequentially provided with a sizing mill 15 and a rewinding machine, and a hot air device 13 is arranged on the side of the curing processor 14.
The vacuum coating treatment tank 12 is filled with a nano ceramic coating to be coated, wherein the coating is SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicone resin, wherein the particle size of the ceramic powder is 900 meshes and SiO is 2 、Al 2 O 3 TiO accounting for 60 percent, 25 percent and 15 percent of the total weight of the ceramic powder, nano silica sol and nano Al 2 O 3 And the addition amounts of the modified silicone resin are 22%, 7% and 15% of the total weight of the ceramic powder, respectively. The paint of the nano ceramic coating 17 is further added with absolute ethyl alcohol and acetone as solvents, polyacrylamide as a thickening agent, and the addition amounts of the absolute ethyl alcohol, the acetone and the polyacrylamide respectively account for 30%, 10% and 0.3% of the total weight (dry weight) of the paint. The pH of the above coating was 7 and the viscosity was 0.25Pas.
The production system of the embodiment is adopted to produce the seamless pure calcium core-spun yarn, the nano ceramic coating 17 is directly and uniformly coated on the surface of the inner core calcium wire 16, the oxidation and gasification loss of calcium can be effectively reduced, and the yield of calcium is higher. Compared with the existing cored wire production system, the production system omits a complex mechanical rolling wire wrapping machine set and devices such as high frequency, laser welding, burr polishing after steel strip welding, heat treatment, rewinding finishing after welding and the like, has simple production process, can effectively avoid the influence of steel strip cladding and subsequent treatment processes on the quality of the cored wire, greatly reduces the rejection rate of the obtained cored wire product, and improves the production efficiency.
As shown in fig. 3, vacuum coating treatment trough 12 passes through inlet conduit 18 and links to each other with stock solution device 19, be equipped with the level gauge in the vacuum coating treatment trough 12, be equipped with feed liquor pump and control valve on the inlet conduit 18, and level gauge, feed liquor pump and control valve all link to each other with control system to can carry out real-time supervision to the coating liquid level in vacuum coating treatment trough 12, and in time supply through inlet conduit 18 and stock solution device 19, be favorable to guaranteeing calcium silk surface coating coated homogeneity and compact coating.
The production system of adopting the seamless pure calcium cored wire of this embodiment produces the cored wire, and its concrete step is as follows:
step one, heating a calcium metal rod 1 to 200 ℃ through a heating device 2, and extruding the heated calcium metal rod into a calcium metal wire 4 with the diameter of 12.85mm through an extruder 3.
And step two, guiding the extruded calcium metal wire 4 into a vacuum coating treatment tank 12 at a speed of 28 m/min, and controlling the temperature in the vacuum coating treatment tank 12 to be 120 ℃ so as to uniformly coat the surface of the calcium metal wire 4 with the nano ceramic coating. The specific process for preparing the nano ceramic coating comprises the following steps: mixing SiO 2 、Al 2 O 3 Stirring with TiO ceramic powder for 41 min, introducing into a reaction kettle at 150 deg.C, adding nanometer silica sol and nanometer Al while stirring 2 O 3 And the modified silicon resin is stirred for 20 minutes, and then absolute ethyl alcohol, acetone and polyacrylamide are added to be continuously stirred for 10 minutes, so that the non-Newtonian nano ceramic liquid coating is obtained.
Because the liquid viscosity is also increased in a nonlinear way greatly along with the increase of the external shearing force of the non-Newtonian liquid, when the speed of the calcium metal wire introduced into the non-Newtonian nano liquid coating is increased, the viscosity of the coating is also increased in a nonlinear way greatly, and the introduction speed of the calcium metal wire is effectively controlled, so that the uniform coating on the surface of the calcium metal wire can be effectively ensured on one hand, and the effective coating thickness of the obtained calcium wire surface coating can be ensured on the other hand.
In this embodiment, the prepared nano ceramic coating is placed in a liquid storage device 19, the coating is conveyed to the vacuum coating treatment tank 12 through a liquid inlet pipeline 18, the vacuum coating treatment tank 12 is vacuumized before conveying, and the vacuum degree is controlled to be 0.65Pa. Meanwhile, in the production process of the cored wire, a liquid level sensor is adopted to monitor the liquid level in the vacuum coating treatment tank 12 in real time, and when the liquid level is lower than a set value, the nano ceramic coating is timely supplied to the vacuum coating treatment tank 12 through a liquid storage device 19 and a liquid inlet pipeline 18.
And step three, guiding the calcium wires 4 coated with the nano ceramic coating into a curing processor 14, and curing the calcium wires through a hot air device 13, wherein the temperature of hot air is controlled at 65 ℃, so that the curing efficiency and curing effect of the coating on the surface of the inner core calcium wires 16 can be improved.
After the surface coating of the calcium metal wire 4 is solidified, guiding the calcium metal wire 4 into a sizing mill 15 through a guide wheel for sizing, cutting off redundant coating on the surface of the calcium wire 4, and rewinding the calcium metal wire through a rewinding machine to prepare a seamless pure calcium finished product core-spun yarn 11 with the diameter of 13mm and the diameter of the inner core calcium wire 16 of 12.85 mm; the cutter of the sizing mill 15 is made of hard alloy, and the diameter of the sizing hole corresponds to the diameter of the cored wire to be produced.
Example 3
As shown in fig. 2, the structure of the production system of a seamless pure calcium cored wire of this embodiment is basically the same as that of embodiment 2, and the difference is that: the grain size of the ceramic powder in the nano ceramic paint filled in the vacuum coating processing tank 12 is 1000 meshes, and the SiO is 2 、 Al 2 O 3 And TiO 53%, 30% and 17% of the total weight of the ceramic powder, nano silica sol and nano Al 2 O 3 And the addition amounts of the modified silicone resin were 25%, 10% and 13% of the total weight of the ceramic powder, respectively. The absolute ethyl alcohol, acetone and polyacrylamide were added in amounts of 28%, 15% and 0.5% by weight (dry weight) of the total paint, which had a pH of 8 and a viscosity of 0.45Pas.
The production system of the seamless pure calcium cored wire of the embodiment is adopted to produce the cored wire, and the production method comprises the following specific steps:
step one, heating a calcium metal rod 1 to 350 ℃ through a heating device 2, and extruding the heated calcium metal rod into a calcium metal wire 4 with the diameter of 10.8mm through an extruder 3.
And step two, guiding the extruded calcium metal wire 4 into a vacuum coating treatment tank 12 at a speed of 25 m/min, controlling the temperature in the vacuum coating treatment tank 12 to be 135 ℃, and uniformly coating the surface of the calcium metal wire 4 with the nano ceramic coating. The specific process for preparing the nano ceramic coating comprises the following steps: mixing SiO 2 、Al 2 O 3 Stirring with TiO ceramic powder for 45 min, introducing into a reaction kettle at 122 deg.C, adding nanometer silica sol and nanometer Al while stirring 2 O 3 And modified silicone resin, stirring for 23 minutes, adding absolute ethyl alcohol, acetone and polyacrylamide, and continuously stirring for 12 minutes to obtain the product of the embodimentThe non-newtonian nanoceramic liquid coating of (1).
In this embodiment, the prepared nano ceramic coating is placed in the liquid storage device 19, the coating is conveyed to the vacuum coating treatment tank 12 through the liquid inlet pipeline 18, and before the coating is conveyed, the vacuum treatment is performed on the vacuum coating treatment tank 12, and the vacuum degree is controlled to be 0.58Pa. Meanwhile, in the production process of the cored wire, a liquid level sensor is adopted to monitor the liquid level in the vacuum coating treatment tank 12 in real time, and when the liquid level is lower than a set value, the nano ceramic coating is timely supplied into the vacuum coating treatment tank 12 through a liquid storage device 19 and a liquid inlet pipeline 18.
And step three, guiding the calcium wires 4 coated with the nano ceramic coating into a curing processor 14, and curing the calcium wires through a hot air device 13, wherein the temperature of hot air is controlled at 73 ℃, so that the curing efficiency and the curing effect of the coating on the surface of the inner core calcium wire 16 can be improved.
After the surface coating of the calcium metal wire 4 is solidified, guiding the calcium metal wire 4 into a sizing mill 15 through a guide wheel for sizing, cutting off redundant coating on the surface of the calcium metal wire 4, and rewinding to prepare a seamless pure calcium finished product core-spun yarn 11 with the diameter of 11 mm; the cutter of the sizing mill 15 is made of hard alloy, and the diameter of the sizing hole corresponds to the diameter of the cored wire to be produced.
Example 4
As shown in fig. 2, the structure of the production system of a seamless pure calcium cored wire of this embodiment is basically the same as that of embodiment 2, and the difference is that: the grain size of the ceramic powder in the nano ceramic coating filled in the vacuum coating processing tank 12 is 800 meshes, and the SiO is 2 、 Al 2 O 3 And TiO accounting for 50 percent, 30 percent and 20 percent of the total weight of the ceramic powder respectively, nano silica sol and nano Al 2 O 3 And the addition amounts of the modified silicone resin are respectively 24%, 8% and 11% of the total weight of the ceramic powder. The absolute ethanol, acetone and polyacrylamide were added in amounts of 27%, 13% and 0.4% by weight (dry weight) of the total coating, respectively, the coating having a pH of 8 and a viscosity of 0.30Pas.
The production system of the seamless pure calcium cored wire of the embodiment is adopted to produce the cored wire, and the production method comprises the following specific steps:
step one, heating a calcium metal rod 1 to 400 ℃ through a heating device 2, and extruding the heated calcium metal rod into a calcium metal wire 4 with the diameter of 11.85mm through an extruder 3.
And step two, guiding the extruded calcium metal wire 4 into a vacuum coating treatment tank 12 at a speed of 30 m/min, and controlling the temperature in the vacuum coating treatment tank 12 to be 150 ℃ so as to uniformly coat the surface of the calcium metal wire 4 with the nano ceramic coating. The specific process for preparing the nano ceramic coating comprises the following steps: mixing SiO 2 、Al 2 O 3 Stirring with TiO ceramic powder for 30 min, introducing into a reaction kettle at 100 deg.C, adding nanometer silica sol and nanometer Al while stirring 2 O 3 And the modified silicon resin is stirred for 25 minutes, and then absolute ethyl alcohol, acetone and polyacrylamide are added to be continuously stirred for 15 minutes, so that the non-Newtonian nano ceramic liquid coating is prepared.
In this embodiment, the prepared nano ceramic coating is placed in a liquid storage device 19, the coating is conveyed to the vacuum coating treatment tank 12 through a liquid inlet pipeline 18, the vacuum coating treatment tank 12 is vacuumized before conveying, and the vacuum degree is controlled to be 0.5Pa. Meanwhile, in the production process of the cored wire, a liquid level sensor is adopted to monitor the liquid level in the vacuum coating treatment tank 12 in real time, and when the liquid level is lower than a set value, the nano ceramic coating is timely supplied into the vacuum coating treatment tank 12 through a liquid storage device 19 and a liquid inlet pipeline 18.
And step three, guiding the calcium wires 4 coated with the nano ceramic coating into a curing processor 14, and curing the calcium wires through a hot air device 13, wherein the temperature of hot air is controlled at 85 ℃, so that the curing efficiency and curing effect of the coating on the surface of the inner core calcium wires 16 can be improved.
After the surface coating of the calcium metal wire 4 is solidified, guiding the calcium metal wire 4 into a sizing mill 15 through a guide wheel for sizing, cutting off redundant coating on the surface of the calcium metal wire 4, and rewinding to prepare a seamless pure calcium finished product core-spun yarn 11 with the diameter of 12 mm; the cutter of the sizing mill 15 is made of hard alloy, and the diameter of the sizing hole corresponds to the diameter of the cored wire to be produced.
In conclusion, compared with the traditional production process of the pure calcium cored wire with a seam and a non-seam, the cored wire production system disclosed by the invention has the characteristics of low production cost, simple process, high production efficiency and excellent product quality, the tensile strength and the bending resistance times of the core wire are higher than those of a steel strip in the using process, the coating compactness of the nano passivation coating on the surface of the core wire is strong, the toughness of the core wire is good, the wire is not clamped or broken in the using process, the using effect is good, and the yield of calcium in molten steel is high, so that the produced cored wire has a wide application prospect in the field of refining calcium in molten steel. Meanwhile, the seamless pure calcium core-spun yarn produced by the invention adopts a silicate ceramic phase with small pollution to molten steel, has higher softening temperature in high-temperature molten steel than that of a steel strip and strong penetrability in the molten steel, can feed the core wire below the critical depth of calcium when the molten steel is refined and used for feeding the yarn, and has no influence of weather conditions (high temperature and high air humidity) to cause the problems of oxidation and hydration of calcium wires and reduction of use effect. In addition, the invention effectively overcomes the defect that the production quality of the existing cored wire is easily influenced by the working procedures of steel belt coating, welding, subsequent heat treatment and the like, greatly reduces the rejection rate of the obtained product, and the calcium wire surface coating is uniformly and compactly coated and firmly combined with the calcium wire, thereby improving the quality and the using effect of the obtained cored wire. Specifically, the production speed of the cored wire can reach 30 m/min, the production efficiency is far higher than that of the seamless and seamless pure calcium cored wires, the quality qualification rate of the product is more than 98%, and the storage period of the product is more than one year without influencing the use effect; the yield of calcium in molten steel can reach the level of 30-50% of the seamless pure calcium line produced by the traditional production method.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.

Claims (8)

1. A seamless pure calcium core-spun yarn is characterized in that: the cored wire consists of an inner core calcium wire (16) and a nano ceramic coating (17) uniformly coated on the surface of the inner core calcium wire (16), wherein the coating of the nano ceramic coating (17) is made of SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicone resins, wherein, siO 2 、Al 2 O 3 TiO 40-60 wt%, 25-35 wt%, 15-25 wt%, nanometer silica sol and nanometer Al 2 O 3 And the addition amount of the modified silicone resin is respectively 20-25%, 5-10% and 10-15% of the total weight of the ceramic powder.
2. The seamless pure calcium cored wire according to claim 1, wherein: the diameter of the cored wire is 9-13mm, the diameter of the inner core calcium wire (16) is 8.7-12.9mm, and the thickness of the nano ceramic coating (17) is 0.15-0.25mm.
3. A seamless pure calcium cored wire according to claim 1 or 2, wherein: the paint of the nano ceramic coating (17) is added with absolute ethyl alcohol and acetone as solvents, and polyacrylamide as a thickening agent.
4. The seamless pure calcium cored wire according to claim 3, wherein: the addition amounts of the absolute ethyl alcohol, the acetone and the polyacrylamide respectively account for 25-30%, 5-15% and 0.1-0.5% of the total weight of the coating.
5. A seamless pure calcium cored wire according to claim 3, wherein: the granularity of the ceramic powder in the nano ceramic coating (17) is 800-1000 meshes, and the PH value of the obtained nano ceramic coating (17) is 7-9.
6. A production system of seamless pure calcium cored wire according to any one of claims 1 to 5, comprising a heating device (2) and an extruder (3), characterized in that: also includes a vacuum coatingA treatment tank (12) and a curing processor (14), wherein the heating device (2), the extruder (3), the vacuum coating treatment tank (12) and the curing processor (14) are arranged in sequence; the vacuum coating treatment tank (12) is filled with nano ceramic coating which is SiO 2 、Al 2 O 3 TiO ceramic powder as basic filler, nanometer silica sol and nanometer Al 2 O 3 And modified silicon resin, absolute ethyl alcohol and acetone are used as solvents, and polyacrylamide is used as a thickening agent.
7. The system for producing a seamless pure calcium cored wire according to claim 6, wherein: the outlet end of the curing processor (14) is also sequentially provided with a sizing mill (15) and a rewinding machine, and a hot air device (13) is arranged on the side of the curing processor (14).
8. The production system of seamless pure calcium cored wire according to claim 6 or 7, wherein: vacuum coating treatment trough (12) link to each other with stock solution device (19) through inlet channel (18), be equipped with the level gauge in vacuum coating treatment trough (12), be equipped with feed liquor pump and control valve on inlet channel (18), and level gauge, feed liquor pump and control valve all link to each other with control system.
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