CN1211175C - Zinc-particle processing method for making electrogalvanizing steel plate - Google Patents
Zinc-particle processing method for making electrogalvanizing steel plate Download PDFInfo
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- CN1211175C CN1211175C CN 03114561 CN03114561A CN1211175C CN 1211175 C CN1211175 C CN 1211175C CN 03114561 CN03114561 CN 03114561 CN 03114561 A CN03114561 A CN 03114561A CN 1211175 C CN1211175 C CN 1211175C
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Abstract
The present invention discloses a zinc-particle processing method for making an electrogalvanizing steel plate, which comprises the following steps: after melted through a melting furnace, zinc ingots enter a holding furnace, and a ceramic internal heating sleeve pipe is used by the holding furnace for supplying heat; when the heat of zinc liquid is preserved, the zinc liquid is protected by N2 or Ar2; the temperature of the zinc liquid in the holding furnace is controlled to be 435 to 455 DEG C. The lower part of the holding furnace is provided with one or more than one through hole, and the through hole is directly connected with a batchmeter. The zinc liquid flows across the batchmeter and drops on a graphite cooling roller after flows across a dropping nozzle, the rotational frequency of the cooling roller is 3 to 80 rpm, 50 to 80% of the body area of the cooling roller is soaked in a condensing water tank and the temperature of water in the condensing water tank is 15 to 45 DEG C. Due to the quick heat conduction of the cooling roll, the zinc liquid rapidly becomes zinc particles, and under the action of centrifugal force, the zinc particles are thrown into a zinc particle collecting box. The zinc particles which are made by using the present invention have the advantages of finish, round and compact zinc particle surface, uniform particles and no pollution, and interiors of the zinc particles has no bubbles, no loosening and no impurities. Thus, the zinc particles do not need surface cleaning and drying treatment, and can be directly packed and put in a warehouse for standby.
Description
Technical field
The invention belongs to the metallic particles processing technique field, relate to a kind of processing method of metallic particles, particularly a kind of zinc granule processing method that is used to make plated steel sheet.
Background technology
Developing of automobile industry is had higher requirement to the intensity and the corrosion resistance of steel plate, and for satisfying the needs of auto industry, the high strength plated steel sheet is just in develop rapidly.When making plated steel sheet, plating is a critical process, and when steel plate was electroplated, the main employing of replenishing of zinc ion added zinc ingot metal or zinc granule in the plating bath, and zinc ingot metal or zinc granule dissolve in plating bath subsequently to be realized.Have inconvenient operation, the uneven deficiency of solution composition by the method for adding the additional zinc ion of zinc ingot metal in the plating bath, cause coating uniformity poor, quality of coating is low.By in plating bath, adding uniform particles, not having the zinc granule be mingled with and replenish zinc ion, can obtain the good zinc coat of uniformity and corrosion resistance, have work efficiency height, advantage such as easy to operate in addition.Therefore, electrogalvanizing production line newly-built or reconstruction most employing the in countries in the world added zinc granule and replaced and added the zinc ingot metal method in the past and replenish zinc ion in the plating bath.
About the processing method of metallic particles mainly contains the molten drop method, the method for splashing and mechanical processing method.The molten drop method and the method for splashing mainly comprise operations such as metal molten, instillation and condensation.A kind of method that adopts molten drop method processing metal grains is disclosed in the United States Patent (USP) 3888956, in the method, the molten stream that makes molten iron falls towards the fixed part of a level, the fragmentation owing to the kinetic energy of itself when melt clashes into these parts, form irregular molten drop, these molten drops are toward the top of above-mentioned parts and outwards motion, fall into the solution that is arranged in the cooling medium below company headquarters of the institute part then.Adopt this known method can make metallic particles, but this method have a lot of shortcoming and defect.Because formed molten drop differed in size to sizable molten drop from very little molten drop when motlten metal clashed into above-mentioned parts, therefore can not control granular size and particle size distribution effectively.A kind of preparation method of tin particle for electroplating steel sheet with tin is disclosed among the Chinese invention patent CN1127686, in this method, after the fusing of metal tin slab, import the jar that instils by discharging opening, tin liquor splashes in the condensation bath through instiling mouth, oil, the double-deck cooling fluid of water are housed in the condensation bath, and the molten tin liquor then splashes into the upper strata oil bath earlier, enters lower floor's water-bath cooled and solidified again and forms graininess tin grain.Can process the uniform tin grain of size although use this method, the tin grain will carry out cleaning by degreasing and oven dry is handled, and has both increased production process, has increased energy consumption again, and degreasing agent is contaminated environment also.A kind of prilling process and equipment thereof of zinc are disclosed among the Chinese invention patent CN1255415, the preparation method of disclosed tin particle for electroplating steel sheet with tin is close substantially among this method and the Chinese invention patent CN1127686, molten zinc liquid directly splashes in the condensation bath, water is housed in the condensation bath directly cools off molten zinc liquid, obtain zinc granule at last.Zinc granule with the processing of this method does not need to carry out ungrease treatment, but still need dry processing, and the direct entry of high temperature zinc liquid Workflow spatters, the danger of blasting in addition when the many and cooling water temperature of zinc liquid entry quantity hangs down.The flow process that the application machine processing method is made zinc granule is: with pouring into a mould after the zinc ingot metal fusing, carry out being prepared into zinc granule after hot pressing and the punching press again, pack at last.Its technical maturity can be produced qualified products.But the subject matter that exists is: 1. complex technical process, and manufacturing procedure is many; 2. the zinc granule recovery rate is low, less than 70%; 3. energy consumption height, the leftover pieces more than 30% need return refuse, consume energy more than 30% more; 4. pressing equipment is huge, and maintenance capacity is big, and labor productivity is low; 5. the equipment construction investment is high; 6. the finished product zinc granule there is pollution.
A kind of processing method and equipment thereof of zinc granule are disclosed among the Chinese invention patent CN1270865A; with zinc ingot metal by behind the furnace melting; flow out by the constant temperature batcher; fused zinc all feeds nitrogen in the whole process by the constant temperature batcher; and be full of the batcher inner space; after rotating cylinder pelletizer or rotating disk pelletizer granulation, cooling receives, and screening back packing gets final product.The zinc granule that the zinc granule that adopts this method to process obtains differs in size, and also needs to sieve processing.
Summary of the invention
At defective that exists in the above-mentioned prior art or deficiency, the zinc granule processing method that the object of the invention is to provide that a kind of efficient height, equipment are simple, easy to operate, plated steel sheet is made in uniform particles and low being used to of production cost.
Realize that foregoing invention purpose technical scheme is such: be used to make the zinc granule processing method of plated steel sheet, comprise fusing, insulation, instillation and condensation and the zinc granule collection of zinc ingot metal, carry out according to the following steps:
1) at first zinc ingot metal is melted with electric induction furnace or resistance furnace;
2) offer a zinc liquid flow export on melting furnace top, with graphite-pipe or earthenware the zinc ingot metal melting furnace is linked to each other with zinc liquid holding furnace, zinc liquid enters zinc liquid holding furnace by graphite-pipe or earthenware, and temperature is controlled at 435 ℃～455 ℃ in the zinc liquid holding furnace, uses N during the insulation of zinc liquid
2Or Ar protection;
3) in the holding furnace bottom, be provided with the through hole more than 1 or 1, through hole directly links to each other with batcher, makes zinc liquid flow through batcher and drip nozzle and splash on the chill roll roll surface, and the drip nozzle outlet is circular, and its internal diameter is 1/2～1/4 of a zinc granule external diameter;
4) galvanizing zinc splashes into after the chill roll roll surface of continuous rotation, and under the quick conductive of chill roll, zinc liquid becomes zinc granule rapidly, and under centrifugal action, zinc granule is thrown into the zinc granule collecting box, and directly the packing warehouse-in is stand-by;
It is characterized in that described drip nozzle discharge area sum is greater than 15mm
2, connecting the pipeline section of melting furnace and holding furnace long-pending is 3.33 times of drip nozzle discharge area sum;
Drip nozzle to the drippage distance (H) of chill roll roll surface and the relation of the water temperature (T) in zinc granule diameter (d) and the condensation water tank satisfies formula (1):
H＝2.5d+k/T (1)
In the formula: H-drips distance, mm; D-zinc granule diameter, mm; The T-water temperature, ℃; K-is immersed in the interior relevant coefficient of body of roll area of condensation water tank with chill roll roller footpath, rotating speed and chill roll, gets 100～150.
By the drippage distance of control drip nozzle to the chill roll roll surface, obtain zinc granule and be of a size of 1.5mm～25mm, out-of-roundness is less than the zinc granule of 0.15mm.
Some other characteristics of the present invention are:
Liquid outlet to the height of liquid level is 40mm～100mm in the said melting furnace.
The heating muff heat supply in the pottery of said holding furnace.
The graphite manufacturing of said chill roll, chill roll is of a size of: (φ 150mm～φ 500mm) * (100mm～1000mm), chill roll rotating speed: 30rpm～80rpm.
50%～80% of said chill roll body of roll area is immersed in the recirculated cooling water case, and the water temperature in the recirculated cooling water case is 15 ℃～45 ℃.
The present invention is compared with the prior art, and has following advantage:
1. zinc ingot metal fusing of the present invention, the insulation of zinc liquid, zinc granule shaping and cooling and collection are once finished, and technology is simple.
2. the good interior heating muff heat supply of pottery of zinc liquid holding furnace employing intensity height, heat transfer efficiency height and electrical insulation capability, the interior heating muff heat supply of employing pottery has cutting down the consumption of energy, reduces the loss of zinc, improves advantages such as temperature-controlled precision and security height.In addition, adopt heating muff heat supply in the pottery, convenient temperature control, it is convenient, fast to change heating element heater.
3. in zinc liquid when insulation, is owing to there is N
2Or the Ar protection, the zinc liquid oxidation is few, and loss rate of oxidation is low, the recovery rate height of zinc, oxidational losses only is 1.0%～2.5%.
4. adopt the present invention can realize adding continuously zinc ingot metal, continuous melting zinc ingot metal, produce zinc liquid and produce zinc granule continuously continuously.
5. zinc granule of the present invention adopts the type of cooling of chill roll heat conduction, has cancelled the type of cooling of oil cooling or water-cooled, and the zinc granule of processing does not need to carry out surperficial ungrease treatment and oven dry is handled, and the zinc granule power consumption of polymer processing is low, and processing cost also reduces, the working (machining) efficiency height.
6. the present invention can obtain the zinc granule of out-of-roundness less than 0.15mm by the drippage distance (H) of control drip nozzle to the chill roll roll surface.
7. the present invention works as drip nozzle discharge area sum greater than 15mm
2The time, connecting the pipeline section of melting furnace and holding furnace long-pending is 3.33 times of drip nozzle discharge area sum, like this can be so that the zinc granule densification, and inner do not have defectives such as loose and pore.
8. make zinc granule recovery rate height with the present invention, recovery rate is greater than 96%.It is low to make the zinc granule energy consumption with the present invention, and the energy consumption of producing zinc granule is 0.75kw/kg～1.10kw/kg.
9. in holding furnace of the present invention bottom, can increase and decrease drip nozzle quantity easily according to zinc granule output, therefore can adjust the output of zinc granule easily, the zinc granule output of single complete equipment is 15kg/h～1000kg/h.
10. the outlet size of the drip nozzle that links to each other with holding furnace bottom batcher can be adjusted easily, so the size of zinc granule also can adjust easily, is the zinc granule of 1.5mm～25mm but use the present invention's production particle size.
Description of drawings
Fig. 1 is that the present invention makes zinc granule device schematic diagram.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
According to technical scheme of the present invention, be used to make the zinc granule processing method of plated steel sheet, comprise fusing, insulation, instillation and condensation and the zinc granule collection of zinc ingot metal.At first zinc ingot metal is melted with electric induction furnace or resistance furnace, because the density of zinc liquid is less than the density of zinc ingot metal, during the zinc ingot metal fusing, zinc liquid come-up.Opened a zinc liquid flow export (abbreviation liquid outlet) on melting furnace top, with graphite-pipe or earthenware the zinc ingot metal melting furnace is linked to each other with zinc liquid holding furnace, zinc liquid enters zinc liquid holding furnace by graphite-pipe or earthenware, the interior heating muff heat supply of pottery that zinc liquid holding furnace employing intensity height, heat transfer efficiency height and electrical insulation capability are good, the interior heating muff heat supply of employing pottery also have cutting down the consumption of energy, reduce the loss of zinc, improve advantages such as temperature-controlled precision and security height.Use N during the insulation of zinc liquid
2Or the Ar protection, prevent the zinc liquid oxidation.Temperature is controlled at 435～455 ℃ in the zinc liquid holding furnace, temperature error ± 3 ℃.In the holding furnace bottom, be provided with the through hole more than 1 or 1, through hole directly links to each other with batcher, zinc liquid flow through batcher and drip nozzle and splash on the chill roll roll surface.The said chill roll condensation method of the present invention is: chill roll is by the good graphite manufacturing of heat conductivility, chill roll size (φ 150mm～φ 500mm) * (100mm～1000mm), 50%～80% of chill roll body of roll area is immersed in the condensation water tank, water temperature in the condensation water tank is 15～45 ℃, chill roll rotating speed 30rpm～80rpm, galvanizing zinc splashes into after the chill roll roll surface, because the quick conductive of chill roll, zinc liquid has become zinc granule rapidly.Because chill roll constantly rotates, under centrifugal action, zinc granule is thrown into the zinc granule collecting box, and the zinc granule surface temperature that enters the zinc granule collecting box is 40～80 ℃, zinc granule any surface finish, rounding, densification, uniform particles, pollution-free, the inner pore-free of zinc granule, loose and be mingled with.Zinc granule with manufacturing of the present invention does not need to carry out surface clean and oven dry processing, and it is stand-by directly to pack warehouse-in.
In the zinc ingot metal melting furnace of the present invention, height to liquid level is 40mm～100mm to zinc liquid from its liquid outlet, the zinc liquid that guarantees liquid outlet has a constant static pressure, thereby passes through the zinc liquid measure of liquid outlet in guarantor unit's time, and is basicly stable in a suitable scope.When drip nozzle discharge area sum greater than 15mm
2The time, connecting the pipeline section of melting furnace and holding furnace long-pending is 3.33 times of drip nozzle discharge area sum.
Because zinc liquid is under himself surface tension effects, power becomes to making himself becomes spheroidal.But falling in the decline process of molten melt drop when being subjected to the barrier effect of gas, will deforming and lose circularity.Owing to shrink, cause Volume Changes during molten melt drop cooling simultaneously, also produce distortion.Molten melt drop is the raindrop shape when falling in air, select the drippage distance (H) of suitable drip nozzle to the chill roll roll surface, can control the length of its raindrop shape afterbody, again by the cooling velocity of control molten melt drop at chill roll, make the zinc granule amount of contraction in the cooling procedure, just equal the volume of its afterbody, then can obtain the good zinc granule of circularity.The relation of the water temperature (T) in H and zinc granule diameter (d) and the condensation water tank is seen formula (1).
When condensate temperature hanged down, the zinc granule amount of contraction was big, therefore drippage distance lengthening; When condensate temperature was high, the zinc granule amount of contraction was little, and therefore the drippage distance shortens.
Below be the embodiment that the inventor provides.
Embodiment 1:
At first zinc ingot metal 1 is placed melting furnace 2, melting furnace is the resistance furnace that adopts 50kw, after the fusing of zinc liquid, because its density is less than zinc ingot metal density, and zinc liquid come-up, zinc liquid is from liquid outlet 3 melting furnace of wandering about as a refugee, and liquid outlet to the height of liquid level is 55mm.Zinc liquid flows into holding furnace 5 through the graphite-pipe 4 of diameter phi 18mm, and holding furnace adopts heating muff 6 heat supplies in the pottery, and the temperature of zinc liquid 7 is controlled at 436～440 ℃, during the insulation of zinc liquid, feeds N
2Protection prevents zinc liquid surface oxidation.Holding furnace lower through-hole 8 is connected with batcher 9, and zinc liquid via through holes flows into batcher, and through directly splashing into behind the drip nozzle 10 on the graphite chill roll 11, the drippage distance that drip nozzle is exported to the chill roll roll surface is 20mm.30 of drip nozzle quantity, drip nozzle outlet size φ 1.8mm.Chill roll size: φ 480mm * 500mm; Chill roll rotating speed: 55rpm.65% of chill roll body of roll area is immersed in the condensation water tank 12, water 13 circulation coolings in the condensation water tank, 24～28 ℃ of temperature.Because the quick conductive of chill roll makes zinc liquid become zinc granule rapidly, because chill roll constantly rotates, under centrifugal action, zinc granule 14 is thrown into zinc granule collecting box 15.Enter 55 ℃ of the zinc granule surface temperatures of zinc granule collecting box, zinc granule particle size φ 3～φ 8mm, the zinc granule process velocity is 450kg/h, the energy consumption of processing zinc granule is 0.85kw/kg.Out-of-roundness＜the 0.14mm of zinc granule, zinc granule any surface finish, densification, uniform particles, pollution-free, the inner pore-free of zinc granule, loose and be mingled with.
Embodiment 2:
At first zinc ingot metal 1 is placed melting furnace 2, melting furnace is to adopt the 46kw resistance furnace, after the fusing of zinc liquid, because its density is less than zinc ingot metal density, and zinc liquid come-up, zinc liquid is from liquid outlet 3 melting furnace of wandering about as a refugee, and liquid outlet to the height of liquid level is 62mm.Zinc liquid flows into holding furnace 5 through the earthenware 4 of diameter phi 12mm, and holding furnace adopts heating muff 6 heat supplies in the pottery, and the temperature of zinc liquid 7 is controlled at 437～442 ℃, during the insulation of zinc liquid, feeds the Ar protection, to prevent zinc liquid surface oxidation.Holding furnace lower through-hole 8 is connected with batcher 9, and zinc liquid via through holes flows into batcher, and through directly splashing into behind the drip nozzle 10 on the graphite chill roll 11, the drippage distance that drip nozzle is exported to the chill roll roll surface is 16mm.30 of drip nozzle quantity, drip nozzle outlet size φ 1.2mm.Chill roll size: φ 200mm * 320mm; Chill roll rotating speed: 48rpm.75% of chill roll body of roll area is immersed in the condensation water tank 12, water 13 circulation coolings in the condensation water tank, 25～30 ℃ of temperature.Because the quick conductive of chill roll, make zinc liquid become zinc granule rapidly, because chill roll constantly rotates, under centrifugal action, zinc granule 14 is thrown into zinc granule collecting box 15, enters 54 ℃ of the zinc granule surface temperatures of zinc granule collecting box, zinc granule particle size φ 2～φ 6mm, zinc granule process velocity 190kg/h, the energy consumption of processing zinc granule is 0.88kw/kg.Out-of-roundness＜the 0.13mm of zinc granule, zinc granule any surface finish, densification, uniform particles, pollution-free, the inner pore-free of zinc granule, loose and be mingled with.
Claims (5)
1, a kind of zinc granule processing method that is used to make plated steel sheet comprises fusing, insulation, instillation and condensation and the zinc granule collection of zinc ingot metal, carries out according to the following steps:
1) at first zinc ingot metal is melted with electric induction furnace or resistance furnace;
2) offer a zinc liquid flow export on melting furnace top, with graphite-pipe or earthenware the zinc ingot metal melting furnace is linked to each other with zinc liquid holding furnace, zinc liquid enters zinc liquid holding furnace by graphite-pipe or earthenware, and temperature is controlled at 435 ℃～455 ℃ in the zinc liquid holding furnace, uses N during the insulation of zinc liquid
2Or Ar protection;
3) in the holding furnace bottom, be provided with the through hole more than 1 or 1, through hole directly links to each other with batcher, makes zinc liquid flow through batcher and drip nozzle and splash on the chill roll roll surface, and the drip nozzle outlet is circular, and its internal diameter is 1/2～1/4 of a zinc granule external diameter;
4) galvanizing zinc splashes into after the chill roll roll surface of continuous rotation, and under the quick conductive of chill roll, zinc liquid becomes zinc granule rapidly, and under centrifugal action, zinc granule is thrown into the zinc granule collecting box, and directly the packing warehouse-in is stand-by;
It is characterized in that described drip nozzle discharge area sum is greater than 15mm
2, connecting the pipeline section of melting furnace and holding furnace long-pending is 3.33 times of drip nozzle discharge area sum;
The relation of the water temperature of drip nozzle to the drippage of chill roll roll surface distance and zinc granule diameter and the condensation water tank satisfies following formula:
H＝2.5d+k/T (1)
In the formula: H-drips distance, mm; D-zinc granule diameter, mm; The T-water temperature, ℃; K-is immersed in the interior relevant coefficient of body of roll area of condensation water tank with chill roll roller footpath, rotating speed and chill roll, gets 100～150;
By the drippage distance of control drip nozzle to the chill roll roll surface, obtain zinc granule and be of a size of 1.5mm～25mm, out-of-roundness is less than the zinc granule of 0.15mm.
2, the zinc granule processing method that is used to make plated steel sheet as claimed in claim 1 is characterized in that, liquid outlet to the height of liquid level is 40mm～100mm in the said melting furnace.
3, the zinc granule processing method that is used to make plated steel sheet as claimed in claim 1 is characterized in that, the heating muff heat supply in the pottery of said holding furnace.
4, the zinc granule processing method that is used to make plated steel sheet as claimed in claim 1, it is characterized in that, the graphite manufacturing of said chill roll, chill roll is of a size of: (φ 150mm～φ 500mm) * (100mm～1000mm), chill roll rotating speed: 30rpm～80rpm.
5, the zinc granule processing method that is used to make plated steel sheet as claimed in claim 4 is characterized in that, 50%～80% of said chill roll body of roll area is immersed in the recirculated cooling water case, and the water temperature in the recirculated cooling water case is 15 ℃～45 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03114561 CN1211175C (en) | 2003-03-21 | 2003-03-21 | Zinc-particle processing method for making electrogalvanizing steel plate |
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| CN 03114561 CN1211175C (en) | 2003-03-21 | 2003-03-21 | Zinc-particle processing method for making electrogalvanizing steel plate |
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| CN1211175C true CN1211175C (en) | 2005-07-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2780215C1 (en) * | 2021-12-01 | 2022-09-20 | Общество С Ограниченной Ответственностью "Адв-Инжиниринг" | Method for granulation of substances |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402201C (en) * | 2006-05-08 | 2008-07-16 | 西安交通大学 | Short technological process of preparing metal grains |
| CN101947653B (en) * | 2010-09-29 | 2013-03-20 | 株洲火炬工业炉有限责任公司 | Method for preparing zinc powder pulp |
| CN103071803A (en) * | 2013-02-27 | 2013-05-01 | 葫芦岛锌业股份有限公司 | Equipment and method for preparing zinc particles for electric plating |
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2003
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2780215C1 (en) * | 2021-12-01 | 2022-09-20 | Общество С Ограниченной Ответственностью "Адв-Инжиниринг" | Method for granulation of substances |
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