CN106363145A - Casting method for improving silver ingot machining quality - Google Patents
Casting method for improving silver ingot machining quality Download PDFInfo
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- CN106363145A CN106363145A CN201611026306.XA CN201611026306A CN106363145A CN 106363145 A CN106363145 A CN 106363145A CN 201611026306 A CN201611026306 A CN 201611026306A CN 106363145 A CN106363145 A CN 106363145A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
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Abstract
The invention discloses a casting method for improving silver ingot machining quality. The method includes the steps that wet silver powder is directly added into a preheated crucible, then the crucible is heated in a medium-frequency furnace, wet silver powder is continuously added in the heating process in batches till the crucible is full, and the temperature is increased after the wet silver powder in the crucible is completed melted; after temperature increasing, a covering agent and a burning agent are added to the surface of silver melt in the crucible, so that oxygen is removed; during oxygen removal, an acetylene spray gun is used for conducting spraying and preheating on a cast mold, the crucible is hung out for silver ingot casting, and molten silver is added in time before molten silver is solidified; and after the molten silver is solidified, silver ingots are taken out and subjected to acid pickling and water cooling, then surface flattening is conducted, and trimming burrs and foreign inclusions are removed. According to the casting method, the process is simple, operation is easy and convenient, the cost is low, and production efficiency is high. The cast silver ingots are provided with few pores inside and are low in oxygen content, the cracking phenomenon is avoided when the silver ingots are used for hot rolling or cold rolling, the excellent rolling performance is achieved, and the physical percent of pass of the silver ingots can reach 99.9% or above.
Description
Technical field
The present invention relates to non-ferrous metallurgy technology field is and in particular to a kind of founding side improving silver ingot crudy
Method.
Background technology
At present, lead zinc-copper smelting enterprise synthetical recovery gold, silver are all cast as silver ingot, ingot using casting method.Silver
There is good electric conductivity, be mainly used in the aspects such as contact material, resistance material, thick film ink, catalyst, plating, mesh
Front for preparing silver electronic paste, the amount of nano-silver thread account for 10%, and in rising trend, jewelry and silverware manufacture etc., and field needs
Ask also larger.Very well, the good silver ingot of casting quality will not ftracture in the operation of rolling ductility of silver.When there being pore in silver ingot
When, its processing characteristics will deteriorate, and easily occur cracking even to rupture, have a strong impact on silver products deep processing enterprise in the operation of rolling
Use.With the development of silver products field of deep, the ratio regular meeting that silver ingot is directly processed is gradually increased, and this requires silver ingot not only
The requirement of relevant criterion is reached on composition, the machining property of silver ingot also will can meet the requirement of relevant enterprise simultaneously.Silver
Product deep processing enterprise needs silver ingot to be carried out with hot-working pretreatment (as made annealing treatment), to improve the performance of silver ingot.This is one
Determine the processing cost that degree increased enterprise, reduce production efficiency simultaneously.
At present, argentum powder founding generally requires and dries wet argentum powder, then carries out fusing casting again, after fusing, grass is added on surface
The oxygen scavengers such as rope, Linesless charcoal, the method deoxygenation time is long, and it is incomplete to easily cause deoxygenation；Patent 201310744814.1 mention by
Graphite granule or Linesless charcoal are placed directly in crucible bottom, are subsequently adding argentum powder.The method needs to be stirred dragging for slag, work before casting
Sequence is complicated, drags for slag and does not thoroughly easily cause silver ingot and carry non-metallic inclusion secretly, this type impurity will affect the apparent of silver-colored rolled products
Quality.If carrying out vacuum melting using argon protection, need to invest professional equipment, production cost is high simultaneously, low production efficiency,
It is unfavorable for enterprise's large-scale production.Commonly use mode of production gained silver ingot at present typically to cannot be directly used to process, be mostly derived from silver
Ingot internal porosity is more and casting cycle in fluid infusion occur not in time being layered.The technique productions low cost of the present invention, easy and simple to handle,
Product rolling performance is good.Gained silver ingot can meet the performance requirement of silver ingot processing, has a extensive future.
Content of the invention
In view of this, it is an object of the invention to proposing a kind of casting method improving silver ingot crudy, the method has
Have process is simple, the features such as easy and simple to handle, low cost, production efficiency are high.
A kind of casting method of the improvement silver ingot crudy being provided based on above-mentioned purpose, the present invention, is comprised the following steps:
(1) wet argentum powder is directly added in the crucible of preheating, then begins to warm up in intermediate frequency furnace, divide in heating process
Criticize and be continuously added to wet argentum powder, until crucible stops adding after filling with, after the wet argentum powder in crucible melts completely, heated up；
(2) the silver-colored bath surface heating up in backward crucible adds coverture and incendiary agent, carries out deoxygenation；
(3) during deoxygenation, mold is sprayed and the pre-heat treatment with acetylene spray gun, then hang out crucible and carry out silver ingot and pour
Casting, and added silvering solution in time before silvering solution solidification；
(4) after silvering solution solidification, take out after silver ingot carries out pickling water-cooled, carry out surfacing, remove burr and external
Field trash.
In the present invention, it is preferred to, the moisture of wet argentum powder described in step (1) is 3～6%.
In the present invention, it is preferred to, step is heated to 1000～1100 DEG C in (1)；It is warming up to 1100～1250 DEG C.
In the present invention, it is preferred to, melt in intermediate frequency furnace wet argentum powder temperature be 1000～1100 DEG C, deoxygenation temperature and
Cast temperature is 1100～1250 DEG C.Inventor's research finds, dissolubility in silvering solution for the oxygen is relevant with temperature, and silver is in solid
During state, dissolubility very little to oxygen, but when temperature is close to fusing point, silvering solution there occurs unexpected changing to the solubility curve of oxygen
Become, dissolubility abruptly increase, be gradually lowered with the rising of temperature afterwards again.In order to avoid making because of the effusion of a large amount of oxygen during casting
The surface defect becoming, needs to properly increase silvering solution temperature before casting, and adds appropriate additive with deoxygenation.Inventor is according to silver
Ingot physical specification qualification rate, temperature control is cast and deoxygenation at 1100～1250 DEG C.
In the present invention, it is preferred to, coverture described in step (2) is powdery combustible species, and described incendiary agent is easy
Combustion things.
In the present invention, it is further preferred that described powdery combustible species are flour, plant ash, rice husk or charcoal powder,
Described combustibles are straw rope or Linesless charcoal.
When silver melts in atmosphere, about absorb the oxygen of 21 times of its volumes, these oxygen can be fierce when silvering solution solidifies
Release, produce splatter phenomenon, bring a lot of difficulties to silver ingot casting, easily causing silver ingot surface has bubbling, puncture etc. bad
Defect, affects silver ingot physical specification qualification rate.The coverture of the present invention and incendiary agent not only meet silver-colored deoxidation under molten condition
Require, and can be good at after completion of the reaction separating with silver, do not increase other impurities element simultaneously.The coverture of the present invention
The oxygen in silvering solution will be consumed with incendiary agent burning so that internal oxygen reacts to surface effusion, coverture simultaneously
Oxygen can be stoped to silvering solution diffusion inside；And between the coverture of the present invention and incendiary agent slag and silvering solution, there is no any dissolving each other
Phenomenon, preferably can separate the physics qualification rate it is ensured that silver ingot casting cycle with silvering solution.
In the present invention, it is preferred to, total addition weight of coverture described in step (2) and described incendiary agent is described wet
The 0.3～1.0% of total addition weight of argentum powder；The addition weight of described coverture is to cover entirely silver-colored bath surface.
In the present invention, the addition of coverture and incendiary agent directly affects deaerating effect.The present invention from deaerating effect and
The cost consumption reducing deoxygenation operation considers, and determines that the addition weight of described coverture is to cover entirely silver-colored melt liquid level to be
Can, total addition weight of described coverture and described incendiary agent is the 0.3～1.0% of total addition weight of described wet argentum powder.
In the present invention, it is preferred to, the time of deoxygenation described in step (2) is 3～8min.Ensure preferable silver ingot thing
Reason qualification rate, the assurance of deoxygenation time is most important, and the time control of deoxygenation is advisable in 3～8min.
In the present invention, it is preferred to, cover mould surface with acetylene spray gun spraying acetylene film in step (3), mold is entered
Row is preheated to 200～300 DEG C.
In the present invention, mold is carried out being preheated to 200～300 DEG C, be a small amount of moisture in order to contain mold in itself
Remove, prevent to form taffoni in silver ingot bottom during silver ingot casting；Cover mould surface with acetylene spray gun spraying acetylene film, be
After the completion of casting, silver ingot is easily departed from mold.Add silvering solution before silvering solution solidification in time, prevent the head of ingot from layering occurring
Phenomenon, prevents from ftractureing in boundary in the operation of rolling.
In the present invention, it is preferred to, described in step (3), silver ingot is cast into: with preheating graphite block block coverture and
Cast after incendiary agent slag, remain in casting cycle that silver-colored bath surface coverture and incendiary agent maintain fired state, control is poured
Teeming speed rate is 0.5kg～1.5kg/s.
In casting cycle, casting rate is too fast, and silver ingot bottom gas has little time to discharge, and is also easy to produce puncture；And pour teeming speed
Spend and then can produce layering slowly, inventor, through test of many times, determines that casting rate is that 0.5kg～1.5kg/s is the most suitable.With
When casting cycle in remain that silver-colored bath surface coverture and incendiary agent maintain fired state, to reach more preferable deoxygenation effect
Really.
In the present invention, it is preferred to, taking-up silver ingot described in step (4) carries out pickling water-cooled and is: takes out silver ingot in quality
Fraction be 1% sulfuric acid solution in carry out pickling, be then washed with deionized, afterwards take out silver ingot cooled down.
In the present invention, after pickling water-cooled, flash removed and surface Minute pores are removed in surface treatment, improve the cleaning on surface
Degree.Apparent mass is poor, and easily causing surface in the operation of rolling has a pitting, easily forms fine crack when compacting is very thin.
In a word, the casting method of the present invention can reduce the gentle hole number of oxygen content in silver ingot, thus improving silver ingot processing
Quality.
Compared with prior art, the method for the present invention has the advantages that
Present invention process is simple, easy and simple to handle, low cost, and production efficiency is high.The present invention does not need additionally to increase equipment, only
A small amount of coverture and incendiary agent need to be increased, and such additive is cheap and easily-available；And front intensification deoxygenation of only need to casting, can automatization
Control.The silver ingot internal porosity of institute's founding is few, and oxygen content is low, has excellent rolling performance, and silver ingot quality significantly improves, silver ingot
Physics qualification rate up to more than 99.9%.The silver ingot that the present invention is produced be used for hot rolling or cold rolling all have not cracking existing
As；Knowable to rolling result, remove the oxygen in silver-removing liquor, can effectively reduce pore in silver ingot and, for the impact of rolling performance, improve
The processing characteristics of silver ingot.
Brief description
Accompanying drawing is with reference to specific process embodiment, specifically understands technique trend.
Fig. 1 is the present invention wet argentum powder founding flow chart.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
Embodiment 1
Qualified wet argentum powder (moisture is 3%) is added in 120# crucible, in kgps-100/25s intermediate frequency heating
To 1000 DEG C of wet argentum powder of fusing, in heating process, it is continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with,
After the wet argentum powder in crucible is completely melt, it is warming up to 1100 DEG C；By wet argentum powder total addition weight 0.3% into crucible
Silver-colored bath surface adds flour and Linesless charcoal, and wherein flour consumption is to cover entirely silver-colored melt liquid level, deoxygenation 3min；Deoxygenation
When, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 200 DEG C.Then hang out crucible, with preheating
Graphite block block and cast after flour and Linesless charcoal slag, keep silvering solution surface flour and Linesless charcoal to maintain fired state in casting cycle,
Control casting rate 1.5kg/s, before silvering solution solidification, add silvering solution in time.After silvering solution solidification, take out silver ingot in 1% (quality
Fraction) pickling in sulfuric acid solution, then it is washed with deionized.Carry out surfacing after silver ingot cooling, remove burr and
Foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to more than 99.9%.
Embodiment 2
Qualified wet argentum powder (moisture is 6%) is added in 120# crucible, in kgps-100/25s intermediate frequency heating
To 1050 DEG C of wet argentum powder of fusing, in heating process, it is continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with,
After the wet argentum powder in crucible is completely melt, it is warming up to 1150 DEG C；By wet argentum powder total addition weight 0.6% into crucible
Silver-colored bath surface adds flour and Linesless charcoal, and wherein flour consumption is to cover entirely silver-colored melt liquid level, deoxygenation 5min；Deoxygenation
When, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 300 DEG C.Then hang out crucible, with preheating
Graphite block block and cast after flour and Linesless charcoal slag, keep silvering solution surface flour and Linesless charcoal to maintain fired state in casting cycle,
Control casting rate 1.0kg/s, before silvering solution solidification, add silvering solution in time.After silvering solution solidification, take out silver ingot in 1% (quality
Fraction) pickling in sulfuric acid solution, then it is washed with deionized.Carry out surfacing after silver ingot cooling, remove burr and
Foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to more than 99.9%.
Embodiment 3
Qualified wet argentum powder (moisture is 5%) is added in 120# crucible, in kgps-100/25s intermediate frequency heating
To 1100 DEG C of wet argentum powder of fusing, in heating process, it is continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with,
After the wet argentum powder in crucible is completely melt, it is warming up to 1250 DEG C；By wet argentum powder total addition weight 1.0% into crucible
Silver-colored bath surface adds flour and Linesless charcoal, and wherein flour consumption is to cover entirely silver-colored melt liquid level, deoxygenation 8min；Deoxygenation
When, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 250 DEG C.Then hang out crucible, with preheating
Graphite block block and cast after flour and Linesless charcoal slag, keep silvering solution surface flour and Linesless charcoal to maintain fired state in casting cycle,
Control casting rate 0.5kg/s, before silvering solution solidification, add silvering solution in time.After silvering solution solidification, take out silver ingot in 1% (quality
Fraction) pickling in sulfuric acid solution, then it is washed with deionized.Carry out surfacing after silver ingot cooling, remove burr and
Foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to more than 99.9%.
Embodiment 4
Qualified wet argentum powder (moisture is 4%) is added in 120# crucible, in kgps-100/25s intermediate frequency heating
To 1100 DEG C of wet argentum powder of fusing, in heating process, it is continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with,
After the wet argentum powder in crucible is completely melt, it is warming up to 1250 DEG C；By wet argentum powder total addition weight 1.5% into crucible
Silver-colored bath surface adds rice husk and straw rope, and wherein flour consumption is to cover entirely silver-colored melt liquid level, deoxygenation 6min；Deoxygenation
When, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 300 DEG C.Then hang out crucible, with preheating
Graphite block block and cast after rice husk and straw rope slag, keep silvering solution surface rice husk and straw rope to maintain fired state in casting cycle,
Control casting rate 0.8kg/s, before silvering solution solidification, add silvering solution in time.After silvering solution solidification, take out silver ingot in 1% (quality
Fraction) pickling in sulfuric acid solution, then it is washed with deionized.Carry out surfacing after silver ingot cooling, remove burr and
Foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to more than 99.9%.
Embodiment 5
Qualified wet argentum powder (moisture is 5%) is added in 120# crucible, in kgps-100/25s intermediate frequency heating
To 1050 DEG C of wet argentum powder of fusing, in heating process, it is continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with,
After the wet argentum powder in crucible is completely melt, it is warming up to 1150 DEG C；By wet argentum powder total addition weight 0.8% into crucible
Silver-colored bath surface adds plant ash and straw rope, and wherein flour consumption is to cover entirely silver-colored melt liquid level, deoxygenation 4min；Deoxygenation
When, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 260 DEG C.Then hang out crucible, with preheating
Graphite block block and cast after plant ash and straw rope slag, keep silvering solution surface plant ash and straw rope to maintain burning shape in casting cycle
State, controls casting rate 0.6kg/s, adds silvering solution in time before silvering solution solidification.After silvering solution solidification, take out silver ingot in 1% (matter
Amount fraction) pickling in sulfuric acid solution, then it is washed with deionized.Carry out surfacing after silver ingot cooling, remove burr
With foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to more than 99.9%.
Comparative example 1
Conventional silver ingot produces smelts, using intermediate frequency, the method combining with electrorefining, and intermediate frequency smelting process is mainly, high
Pure electricity argentum powder (argentum powder of more than 99.9% purity of electrorefining output) is melted in intermediate frequency furnace and is blown, blowing temperature
At 1200 DEG C about, the time is 30min；Slag making reagent is added to carry out oxidative slagging after the completion of blowing, slag making reagent is mainly carbon
Sour sodium and silicon dioxide, addition carries out suitable regulation according to electric argentum powder impurity element situation；Carry out after the completion of slag making reaction
Deoxygenate operation, deoxidation process is after the completion of slag making reaction, addition lump charcoal reaction 20min about, the addition of Linesless charcoal is
2kg/ stove, is cast into ingot afterwards.The physics qualification rate of silver ingot is up to 90%.
The limitation of traditional deoxidation method is: Linesless charcoal availability is low, wastes serious；Charcoal particle easily causes ingot face folder
Slag, affects silver ingot physics qualification rate；The Linesless charcoal deoxidation reaction time is long, and electric energy loss is serious, and it is incomplete to easily cause deoxygenation.Using
The silver ingot that the method for comparative example 1 produces easily occurs cracking even to rupture in the operation of rolling.
Comparative example 2
By the 1.0% of total addition weight of wet argentum powder, graphite or charcoal particle are placed directly in 120# crucible bottom, then
Add qualified wet argentum powder (moisture is 5%) into 120# crucible, in kgps-100/25s intermediate frequency heating to 1100 DEG C
Melt wet argentum powder, in heating process, be continuously added to wet argentum powder in batches, until 120# crucible stops adding after filling with, treat in crucible
Wet argentum powder be completely melt after, be warming up to 1250 DEG C；Add flour to crucible surface, flour consumption is to cover entirely silver-colored melt liquid
Face, deoxygenation 8min；During deoxygenation, cover mould surface with acetylene spray gun spraying acetylene film, mold is carried out being preheated to 250
℃.Then hang out crucible, block casting after flour and Linesless charcoal slag with the graphite block of preheating, in casting cycle, keep silvering solution surface face
Powder and Linesless charcoal maintain fired state, control casting rate 0.5kg/s, add silvering solution in time before silvering solution solidification.Silvering solution solidifies
Afterwards, take out silver ingot pickling in 1% (mass fraction) sulfuric acid solution, be then washed with deionized.Carry out table after silver ingot cooling
Face is smooth, removes burr and foreign impurity etc..Weigh warehouse-in, the physics qualification rate of silver ingot is up to 97%.
Graphite or charcoal particle are placed directly in crucible bottom by this comparative example, then add argentum powder, and remaining step is with real
Apply example 3.Non-metallic inclusion is carried secretly using the silver ingot that the method for comparative example 2 produces, the silver-colored rolled products of this type impurity impact
Presentation quality, this is because graphite or charcoal particle are placed directly in crucible bottom by comparative example 2, this is accomplished by carrying out before casting
Slag, complex procedures are dragged in stirring, drag for slag and thoroughly do not easily cause silver ingot and carry non-metallic inclusion secretly.
In order to check the processing characteristics of embodiment 1-5 gained silver ingot, silver ingot specification is (370 ± 5) × (135 ± 2) × (30
± 1) mm, substance 15～16kg.Every batch choose 3 pieces carry out different disposal after, carry out rolling test.Specific as follows:
Test example 1
Choose produced silver ingot in embodiment 1-5 to insert in annealing furnace, control 400 DEG C of temperature, be incubated 4h, natural cooling is laggard
Row rolling, a size of 1600 × 220 × 4 after rolling, in the operation of rolling, crackle and any surface finish in silver ingot surface.
Test example 2
Choose produced silver ingot in embodiment 1-5 to insert in annealing furnace, control 600 DEG C of temperature, be incubated 4h, natural cooling is laggard
Row rolling, a size of 1600 × 220 × 4.08 after rolling, in the operation of rolling, crackle and any surface finish in silver ingot surface.
Test example 3
Choose produced silver ingot in embodiment 1-5 to insert in annealing furnace, without making annealing treatment Direct Rolling, after rolling a size of
1600 × 220 × 4, in the operation of rolling, crackle and any surface finish in silver ingot surface.
Advantage of the invention is that obtaining the good silver ingot of rolling performance, the method for the present invention can effectively reduce oxygen in silver ingot
The gentle hole number of content, improves the crudy of silver ingot.
In sum, present invention process is simple, easy and simple to handle, low cost, and production efficiency is high.The present invention does not need additionally to increase
Oil (gas) filling device, only need to increase a small amount of coverture and incendiary agent, and such additive is cheap and easily-available；And only need to heat up before casting and remove
Oxygen, can Automated condtrol.The silver ingot internal porosity of institute's founding is few, and oxygen content is low, has excellent rolling performance, and silver ingot quality shows
Write and improve, the physics qualification rate of silver ingot is up to more than 99.9%.The silver ingot that the present invention is produced is used for hot rolling or cold rolling all has
Not cracking phenomenon；Knowable to rolling result, remove the oxygen in silver-removing liquor, can effectively reduce in silver ingot pore for rolling performance
Impact, improve the processing characteristics of silver ingot.
Those of ordinary skill in the art are it is understood that the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (inclusion claim) is limited to these examples；Under the thinking of the present invention, above example
Or can also be combined between the technical characteristic in different embodiments, and there is the different aspect of the present invention as above
Many other changes, in order to simple and clear they do not provide in details.Therefore, all within the spirit and principles in the present invention,
Any omission of being made, modification, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of casting method improving silver ingot crudy is it is characterised in that comprise the following steps:
(1) wet argentum powder is directly added in the crucible of preheating, then begins to warm up in intermediate frequency furnace, connect in heating process in batches
The wet argentum powder of continuous addition, until crucible stops adding after filling with, after the wet argentum powder in crucible melts completely, is heated up；
(2) the silver-colored bath surface heating up in backward crucible adds coverture and incendiary agent, carries out deoxygenation；
(3) during deoxygenation, mold is sprayed and the pre-heat treatment with acetylene spray gun, then hang out crucible and carry out silver ingot casting, and
Added silvering solution in time before silvering solution solidification；
(4), after silvering solution solidification, after taking-up silver ingot carries out pickling water-cooled, carry out surfacing, remove burr and foreing impuritys
Thing.
2. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that described in step (1)
The moisture of wet argentum powder is 3～6%.
3. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that heat in step (1)
To 1000～1100 DEG C；It is warming up to 1100～1250 DEG C.
4. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that described in step (2)
Coverture is powdery combustible species, and described incendiary agent is combustibles.
5. the casting method improving silver ingot crudy according to claim 1, coverture described in step (2) and described
Total addition weight of incendiary agent is the 0.3～1.0% of total addition weight of described wet argentum powder；The addition weight of described coverture is
Cover entirely silver-colored melt liquid level.
6. the casting method improving silver ingot crudy according to claim 4 is it is characterised in that described powdery incendivity
Material is flour, plant ash, rice husk or charcoal powder, and described combustibles are straw rope or Linesless charcoal.
7. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that described in step (2)
The time of deoxygenation is 3～8min.
8. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that use second in step (3)
Alkynes spray gun spraying acetylene film covers mould surface, and mold is carried out being preheated to 200～300 DEG C.
9. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that described in step (3)
Silver ingot is cast into: blocks casting after coverture and incendiary agent slag with the graphite block of preheating, remains silver-colored melt in casting cycle
Surface dopant and incendiary agent maintain fired state, and control casting rate is 0.5kg～1.5kg/s.
10. the casting method improving silver ingot crudy according to claim 1 is it is characterised in that described in step (4)
Take out silver ingot to carry out pickling water-cooled and be: take out silver ingot mass fraction be 1% sulfuric acid solution in carry out pickling, then spend from
Sub- water washing, takes out silver ingot afterwards and is cooled down.
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| CN201611026306.XA CN106363145A (en) | 2016-11-21 | 2016-11-21 | Casting method for improving silver ingot machining quality |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326191A (en) * | 2017-07-26 | 2017-11-07 | 大冶有色金属有限责任公司 | A kind of silver ingot casting deoxidier of efficient pollution-free and its method of deoxidation and application |
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