CN105861853A - Direct rectification method of molten liquid crude cadmium - Google Patents
Direct rectification method of molten liquid crude cadmium Download PDFInfo
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- CN105861853A CN105861853A CN201610427401.4A CN201610427401A CN105861853A CN 105861853 A CN105861853 A CN 105861853A CN 201610427401 A CN201610427401 A CN 201610427401A CN 105861853 A CN105861853 A CN 105861853A
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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
- C22B17/00—Obtaining cadmium
- C22B17/06—Refining
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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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/02—Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action including acoustic waves
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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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a direct rectification method of molten liquid crude cadmium. A cadmium cake is placed in a crude cadmium smelting furnace to be smelted, the smelting temperature ranges from 500 DEG C to 700 DEG C, the adding proportion of sodium hydroxide is (15-16):100, the adding proportion of a reducing agent is (1-2):100, and impurities Zn, Pb, Cu and NaOH react to generate sodium salt which is generally called alkali slag; the density of the alkali slag is smaller than that of cadmium, so that the alkali slag is layered and floats on cadmium liquid; meanwhile, a small amount of CdO wrapped by the alkali slag is reduced into metal cadmium by a reducing agent, the alkali slag is cleared up regularly to remove impurities, and a crude cadmium solution containing larger than 98% of Cd and smaller than 0.05% of Zn is obtained; the crude cadmium solution passes through the bottom of a crude cadmium smelting furnace, flows out of a discharging opening controlled by a valve special for groove-free metal melt and flows into a middle maintaining furnace; the crude cadmium solution in the middle maintaining furnace is sucked into a vacuum rectifying furnace through a siphon tube of the vacuum rectifying furnace for high-temperature rectifying at the temperature of 400 DEG C to 500 DEG C; due to the fact that the volatilization temperature of cadmium is far lower than that of impurity elements, cadmium vapor is formed by liquid cadmium, and is condensed into liquid cadmium or a fine cadmium ingot in a condenser.
Description
Technical field
The method that the present invention relates to the thick cadmium direct rectifying of liquid of a kind of fused solution.Belong to non-ferrous metallurgy technology field.
Background technology
In the smelting of zinc, the cadmium in zinc sulfide concentrates is volatized into flue dust, flue dust during boiling roaster
After leaching, cadmium enters leachate, and leachate purifies through zinc powder, obtains copper-cadmium slag, and copper-cadmium slag is again through leaching
Going out, zinc dust precipitation obtains Spongy Cadmium and copper ashes, and Spongy Cadmium is squeezed into fine and close cadmium cake through cooked flake wrapping machine.Cadmium cake is general
Containing cadmium 70～85%, containing zinc 3～5%.
In the existing technology utilizing cadmium cake to produce pure cadmium ingot, at 500～700 DEG C, cadmium cake is melted, and add
After hydro-oxidation sodium, reducing agent remove impurity and reduction, the thick cadmium liquid more than 98% containing cadmium casts thick cadmium ingot.Slightly
Cadmium ingot casts pure cadmium ingot after further rectifying.Its technique is generally: Spongy Cadmium → cadmium cake → thick refining → thick cadmium ingot
→ rectifying → ingot casting → pure cadmium ingot.Owing to thick cadmium liquid can not directly carry out rectifying in thick furnace, thus have to
After about 600 DEG C of thick cadmium liquid cooling ingot castings, then send rectifying furnace to be warmed to 400～500 DEG C to carry out high temperature rectifying, high
The thick a large amount of sensible heat of cadmium liquid of temperature cannot utilize, and causes energy consumption high.
To in the research of the method and practice process, the inventors found that: above-mentioned technique well solves
Zinc wet smelting process of having determined is produced Spongy Cadmium and is reclaimed the problem of cadmium, but high-temperature fusion thick cadmium liquid needs in removal process
Sending rectifying furnace to carry out rectifying after cooling ingot casting, high-temperature fusion thick cadmium liquid heat content cannot utilize, and adds Spongy Cadmium and returns
Receive energy consumption, final its production cost of increase.
Summary of the invention
For overcoming above-mentioned prior art to have problems, it is direct that the present invention proposes a kind of new fused solution thick cadmium liquid
The method of rectifying.The present invention can reduce energy consumption, improve automaticity, reduction production cost, improvement operation
Environment, reduction construction costs.
The step of a kind of fused solution of the present invention thick cadmium liquid direct rectificating method fusion process includes: slightly refine, partially
Sodium phosphate removal of impurities, blowing, distillation process；Wherein
One, slightly refining: a certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), smelting temperature be 500 DEG C～
700 DEG C, adding NaOH, NaOH is 15～16:100 with the ratio of cadmium cake, adds reducing agent, also
Former dose is 1～2:100 with cadmium cake ratio, makes impurity Zn, Pb, Cu and NaOH in cadmium cake react generation sodium salt,
Its density is less than the density of cadmium and forms layering, and floats on above cadmium liquid, simultaneously a small amount of CdO of parcel in alkaline residue
Be reduced agent and be reduced into cadmium metal, by timing cleaning alkaline residue remove impurity, obtain containing Cd ＞ 98%, Zn ＜ 0.05%,
The thick cadmium liquid of Pb < 0.4%；
Two, sodium metaphosphate removal of impurities: add sodium metaphosphate removal of impurities, it adds the ratio of sodium metaphosphate and thick cadmium liquid
Example is 1～2:100, and smelting temperature is 600～700 DEG C, and smelting time is 1～2h, is skimmed by scum silica frost, thick cadmium liquid
Containing Pb < 0.01%；
Three, blowing: thick cadmium flow quantity by bottom thick cadmium smelting furnace (1) through without trench metal fusant special service valve
(3) controlling, flow directly out entrance moderate soak stove (4) from drain hole (2), the control of thick cadmium liquid temp is
380～450 DEG C；
Four, rectifying: moderate soak stove (4) is connected by siphon pipe (5) with vacuum fine furnace (6), middle
Thick cadmium liquid in holding furnace (4) is drawn into vacuum < the vacuum fine furnace (6) of 25Pa through siphon pipe (5)
In, thick cadmium liquid carries out high temperature rectifying melting with 400～500 DEG C in vacuum fine furnace (6), and liquid cadmium becomes
Steam state cadmium, then cadmium steam, cadmium steam is cold in vacuum fine furnace (6) top escape pipe enters condenser (7)
Forming liquid cadmium after Ning, the most condensed ingot casting of liquid cadmium obtains pure cadmium ingot, the impurity in vacuum fine furnace (6)
Exiting into rectifying slag from bottom discharging opening, rectifying slag can recycle separately.
Described high temperature rectifying fusion process addition sodium metaphosphate in vacuum fine furnace (6), at 600～700 DEG C
At a temperature of carry out deep impurity-removing, reduce further the impurity content in thick cadmium liquid.
The temperature of thick cadmium liquid is 500～600 DEG C, is controlled by the high temperature resistant special service valve of fusant without trench metal (2)
Opening or closing of thick cadmium smelting furnace drain hole (2), is controlled to open valve 5 at interval of 60 minutes by PLC control system
Minute, control to put thick cadmium liquid measure, thus reach to control the purpose of vacuum fine furnace inlet amount.
500 DEG C～700 DEG C of high-temperature fusion liquid thick cadmium liquid are directly entered vacuum fine furnace and carry out rectifying.
Drain hole (2) outlet of described thick cadmium smelting furnace (1) is to extend in moderate soak stove (4), and
In the thick cadmium liquid covered by alkali lye.
It is provided with electric heating tube at drain hole (2) the outer wall circumference of described thick cadmium smelting furnace (1) and uses parcel to protect
Adiabator mode is incubated.
The cadmium of described fused solution is during thick cadmium smelting furnace (1) to vacuum fine furnace (6), by precisely
Control system allows temperature be maintained at 600～700 DEG C.
It is high that described siphon pipe (5) gating location is located at least in moderate soak stove (4) inner bottom part 20～30cm
Degree, allows the relatively small number of thick cadmium liquid flow of moderate soak stove (4) internal upper part lead content could enter vacuum fine furnace
In.
Described a certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), refer to every 5 minutes by automatically
Charging mechanism add cadmium Cd content be 70～85%, weight be that the cadmium cake of 10～25kg is to thick cadmium smelting furnace (1)
Middle melting.
A discharging opening is opened in advance in moderate soak stove (4) bottom；The outer wall of described whole moderate soak stove (4)
It is provided with electric heating tube at circumference and uses parcel insulation material mode to be incubated moderate soak stove (4).
Working mechanism of the present invention: owing to cadmium metal is very active, expose the most oxidized, therefore
In fusion process, surface need to cover alkali lye, and it is oxidized that alkali not only makes cadmium metal and air exclusion prevent, Er Qieyu
Impurity element reaction forms alkaline residue, but alkaline residue viscosity is big, poor fluidity, easily causes drain hole blocking, commonly
Blowing mode cannot meet the uniform and stable feed needs of continuous vacuum rectifying.Traditional handicraft is first by thick cadmium
Liquid is cast into thick cadmium ingot, i.e. cadmium and slightly refines and refine relatively independent production organizational mode, it is desirable to low, is suitable for artificial
Operation, but long flow path, energy consumption is high.
Cadmium is slightly refined and refines and changes continuous processing flow process into from independent two flow processs being interrupted by the present invention, the most melted
The mode of production of the thick direct rectifying of cadmium liquid of liquid, and use twice sodium metaphosphate of interpolation to carry out the degree of depth except lead,
Thick cadmium liquid impurity content is greatly reduced, it is achieved reduce the purpose of production cost by reducing energy consumption, and improve
Automatization level.The present invention by 500～700 DEG C of high-temperature fusion liquid thick cadmium liquid by bottom thick cadmium smelting furnace by nothing
The drain hole that trench metal fusant special service valve controls flows out, and flows into moderate soak stove, uses moderate soak stove to realize
Supply liquid stable, uniform, continuous thick cadmium liquid raw material mode；Thick cadmium liquid in moderate soak stove is again by centre
Holding furnace is connected with vacuum fine furnace to be had siphon pipe (stainless steel siphon pipe) to be drawn in vacuum fine furnace to carry out height
Temperature rectifying (400～500 DEG C), adds sodium metaphosphate and carries out the degree of depth and remove lead, owing to the volatilization temperature of cadmium is remote
Less than impurity element (Pb, Zn, Tl, Fe, Cu, Ni, Sn, Sb, Ag) volatilization temperature, thus allow liquid
Cadmium forms cadmium steam, and is condensed into liquid cadmium within the condenser.
Owing to the cadmium liquid of molten condition easily aoxidizes, expose and be the most at once oxidized to cadmium oxide, flow regime
Cadmium liquid and air in oxygen intense reaction can produce substantial amounts of tobacco (cadmium oxide flue dust), cadmium oxide is can
Carcinogen, the healthy grave danger that causes to operating personnel, the present invention uses thick cadmium smelting furnace drain hole
(2) during discharging opening extend into the internal liquid thick cadmium liquid covered by alkali lye of moderate soak stove (4), thus prevent
Thick cadmium liquid and air contact.
The fusing point of cadmium 321 DEG C only has the least temperature difference region, slightly to the smelting temperature 500 DEG C～700 DEG C of thick cadmium
Cadmium liquid can be declined some by temperature when exporting outflow and result in solid-state cadmium, and solid-state cadmium can cause the blocking in exit,
Need artificial frequently cleaning, affect production efficiency, and by scorification solid-state cadmium of manually heating again, increase operation
Personnel and poison gas touch opportunity, it is impossible to meet the operation requirement of the frequent blowing of continuous rectification.The present invention is whole
It is provided with electric heating tube at the outer wall circumference of root drain hole (2) and uses parcel insulation material mode to be incubated simultaneously,
Guarantee that thick cadmium liquid will not be cooled into solid cadmium at drain hole (2), it is possible at any time thick cadmium liquid is melted from thick cadmium
Furnace (1) is put in moderate soak stove (4), and it is simple to operate, it is ensured that stablizing and fixed of follow-up rectifying operation
Amount charging, makes charging and yield balance, prevents from feeding too much or very few causes pure cadmium product P b content overproof,
Final production goes out the pure cadmium product of 99.995%.
Traditional thick cadmium liquid casts the mode of production of thick cadmium ingot can the most simply realize the control of inlet amount, only
The burn-off rate controlling thick cadmium ingot just can realize.But the present invention uses fused solution direct vacuum fine furnace raw
Product mode cannot realize by the way of similar, it is necessary to use non-traditional mode to realize, then the present invention uses essence
Quasi-control system controls fused solution thick cadmium liquid and is maintained at 600 DEG C～700 DEG C in the temperature of vacuum fine furnace (6)
Scope, works in coordination and realizes goal of the invention.
Because lead density is bigger than cadmium density, in the thick cadmium liquid of molten condition, lead produces " sinking to the bottom " due to gravity segregation
Phenomenon, i.e. can cause the thick cadmium liquid meeting enriched lead of moderate soak furnace bottom, through the accumulation of short period, middle guarantor
In temperature stove, lead content can rise 10 times, causes the pure cadmium product lead doping of vacuum fine furnace output.The present invention is led to
Crossing to be positioned at the charging of vacuum fine furnace with siphon pipe outlet placement has apart from moderate soak furnace bottom position
At the height of 20cm～30cm, thus allow the relatively small number of thick cadmium liquid flow ability of moderate soak stove internal upper part lead content
Enter in vacuum fine furnace, prevent high leaded thick cadmium liquid from entering in vacuum fine furnace (6), it is ensured that finally essence
Cadmium product quality.
Additionally, the thick cadmium liquid more in order to reduce enriched lead content in moderate soak stove, the present invention can also be
Moderate soak furnace bottom opens a discharging opening in advance, the thick cadmium liquid of enriched lead in certain time relief moderate soak stove 4
Flow out from this discharging opening.
The present invention passes through the different amounts of sodium metaphosphate of twice interpolation, it is achieved the degree of depth removes the portions such as the Pb in thick cadmium liquid
Part impurity, thus reduce Viscosity of Liquid Metal, improving the mobility of thick cadmium molten metal bath, this is from another point of view
For also can prevent thick cadmium smelting furnace discharging opening from blocking.
Technique scheme it can be seen that due to the embodiment of the present invention use the fused solution thick cadmium direct rectifying of liquid
Method, therefore beneficial effects of the present invention:
1, energy consumption is low: the present invention directly processes fused solution thick cadmium liquid, makes full use of the heat content of high temperature thick cadmium liquid,
Save the energy.
2, automaticity is high: the Spongy Cadmium cake in the smelting process of the present invention by automatic feeding device according to
Set time interval and join in thick cadmium smelting furnace, it is achieved the continuous production of thick cadmium melting；Thick by automatically controlling
The special service valve of fusant without trench metal of cadmium smelting furnace drain hole opens or closes, it is achieved the automatic control of vacuum fine furnace charging
System, and realize the continuous production of thick refining and refining.
3, production cost is low: by automatically controlling the inlet amount of vacuum fine furnace, it is achieved uniform feeding, improves
The rectification efficiency of vacuum fine furnace, saves production cost.
4, good operational environment: the smelting process fused solution thick cadmium liquid of the present invention is by the insulation control of moderate soak stove
Flow processed is directly entered in vacuum fine furnace, cancels original thick cadmium ingot casting and the operation of thick cadmium ingot handling charging,
Simplification of flowsheet, can make operating environment improve further.
5, cost is low: the smelting process of the present invention cancels casting and the recycling fusion process of thick cadmium liquid, both subtracts
Produce equipment, production link less, save again construction investment.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is the structural representation that the present invention uses device.
Fig. 3 is prior art processes flow chart.
In figure, 1 thick cadmium smelting furnace, 2 drain holes, 3, without trench metal fusant special service valve, protect in the middle of 4
Temperature stove, 5 siphon pipes, 6 vacuum fine furnaces, 7 condensers, 8 pig moulding machines.
Detailed description of the invention
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, in describing below
Accompanying drawing is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying creation
Property work on the premise of, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The inventive method includes: every 5 minutes add a weight by automatic feeding mechanism is 10kg's～25kg
Cadmium cake (Cd 70%～85%) is to melting in thick cadmium smelting furnace, and smelting temperature is 500 DEG C～700 DEG C, hydroxide
The additional proportion of sodium is 15～16:100, and the additional proportion of reducing agent (coal or wood) is 1～2:100, makes
Impurity Zn, Pb, Cu and NaOH react generation sodium salt, are referred to as alkaline residue, and alkaline residue density is less than the density of cadmium and shape
Becoming layering, and float on above cadmium liquid, in alkaline residue, a small amount of CdO of parcel is reduced agent and is reduced into cadmium metal simultaneously,
Remove impurity by timing cleaning alkaline residue, obtain containing Cd ＞ 98%, the thick cadmium liquid of Zn ＜ 0.05%；Thick cadmium liquid passes through
Flowed out by the drain hole controlled without trench metal fusant special service valve bottom thick cadmium smelting furnace, flow into moderate soak stove；
Thick cadmium liquid in moderate soak stove is drawn in vacuum fine furnace by the siphon pipe of vacuum fine furnace and carries out high temperature
Rectifying (400 DEG C～500 DEG C), due to cadmium volatilization temperature far below impurity element (Pb, Zn, Tl, Fe,
Cu, Ni, Sn, Sb, Ag) volatilization temperature, liquid cadmium forms cadmium steam, and is condensed into liquid within the condenser
Cadmium, then obtain pure cadmium ingot through condensation ingot casting, impurity enters rectifying slag, can recycle separately, individually below
It is described in detail.
Embodiment 1
Feed intake first: 375kg NaOH is put into 1m3Thick cadmium smelting furnace in, control smelting furnace heating
Temperature 450 DEG C, after NaOH melts, temperature is raised to 650 DEG C.By the cadmium cake of dry weight 2.5t (containing Cd73.45%,
Containing Zn4.56%) put in thick cadmium smelting furnace by cadmium cake automatic feeding device, and add the raw coal (C55%) of 25kg
Reduce.Setting charging time is spaced, it is ensured that cadmium cake addition is 200kg/h.Open drain hole valve to put
Go out thick cadmium liquid about 1.1t to stand-by in moderate soak stove, through vacuum fine furnace rectifying, and cast and obtain grade and be
The pure cadmium ingot 1.08t of 99.995%.
Continuous-stable feeds intake: addition amount of sodium hydroxide 50kg/h, and temperature controls at 650 DEG C.To contain cadmium 75.42%,
Spongy Cadmium cake addition containing zinc 3.56% is 150kg/h.Often open thick cadmium smelting furnace drain hole valve every other hour
Put the thick cadmium liquid of about 100kg to vacuum fine furnace carries out rectifying, per hour can the pure cadmium liquid of output about 92kg,
Obtain, after casting, the pure cadmium ingot that grade is 99.995%.
Embodiment 2
The cadmium cake (containing Cd73.45%, Zn4.56%) of 375kg NaOH and dry weight 2.5t is put into 1m3's
In thick cadmium smelting furnace, controlling smelting furnace heating-up temperature 450 DEG C, after NaOH melts, temperature is raised to 650 DEG C,
And the raw coal (C55%) adding 25kg reduces, after melting 12 hours, skim alkaline residue, add the inclined phosphorus of 18kg
Acid sodium fusion refines 1 hour, skims scum silica frost, after obtaining qualified thick cadmium liquid, opens thick cadmium smelting furnace the most every other hour
Drain hole valve is put the thick cadmium liquid of about 100kg and is carried out rectifying, the thick cadmium in thick cadmium smelting furnace in pure cadmium rectifying furnace
After liquid discharges, carry out next cycle feed intake, melting operation, so circulate.By using two thick cadmium smelting furnaces
Interruption melting, intersection are put the mode of thick cadmium liquid and are ensured that the thick cadmium liquid of pure cadmium rectifying furnace supplies continuously, thick cadmium rectifying furnace
Per hour can the pure cadmium liquid of output about 92kg, obtain, after casting, the pure cadmium ingot that grade is 99.995%.
Pure cadmium energy consumption statistic table
| Sequence number | Yield (t) | Total power consumption (kWh) | Average current drain (kWh) | Remarks |
| 1 | 15 | 22360.5 | 1490.7 | |
| 2 | 25 | 39500 | 1580 | |
| 3 | 36 | 52848 | 1468 | |
| 4 | 29 | 46081 | 1589 | |
| 5 | 19 | 28281.5 | 1488.5 | |
| Add up to | 124 | 189071.0 | 1524.8 |
The method of a kind of fused solution thick cadmium direct rectifying of liquid provided the embodiment of the present invention above, has been carried out in detail
Introducing, principle and the embodiment of the present invention are set forth by specific case used herein, above enforcement
The explanation of example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for this area one
As technical staff, according to the thought of the present invention, the most all will change,
In sum, this specification content should not be construed as limitation of the present invention.
Claims (10)
1. the method for the fused solution thick cadmium direct rectifying of liquid, it is characterised in that the step bag of its fusion process
Include: thick refining, sodium metaphosphate removal of impurities, blowing, distillation process；
One, slightly refining: a certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), smelting temperature be 500 DEG C～
700 DEG C, adding NaOH removal of impurities, NaOH is 15～16:100 with the ratio of cadmium cake, adds reducing agent,
Reducing agent and cadmium cake ratio are 1～2:100, make impurity Zn, Pb, Cu and NaOH in cadmium cake react generation sodium salt,
Its density is less than the density of cadmium and forms layering, and floats on above cadmium liquid, simultaneously a small amount of CdO of parcel in alkaline residue
Be reduced agent and be reduced into cadmium metal, by timing cleaning alkaline residue remove impurity, obtain containing Cd ＞ 98%, Zn ＜ 0.05%,
The thick cadmium liquid of Pb < 0.4%；
Two, sodium metaphosphate removal of impurities: add sodium metaphosphate removal of impurities, it adds the ratio of sodium metaphosphate and thick cadmium liquid
Example is 1～2:100, and smelting temperature is 600～700 DEG C, and smelting time is 1～2h, is skimmed by scum silica frost, thick cadmium
Liquid contains Pb < 0.01%；
Three, blowing: thick cadmium flow quantity by bottom thick cadmium smelting furnace (1) through without trench metal fusant special service valve
(3) control, from drain hole (2) flow directly out entrance moderate soak stove (4), thick cadmium liquid temp control be 380～
450℃；
Four, rectifying: moderate soak stove (4) is connected by siphon pipe (5) with vacuum fine furnace (6), in
Between thick cadmium liquid in holding furnace (4) be drawn into vacuum < the vacuum fine furnace (6) of 25Pa through siphon pipe (5)
In, thick cadmium liquid carries out high temperature rectifying melting with 400～500 DEG C in vacuum fine furnace (6), and liquid cadmium becomes
Steam state cadmium, then cadmium steam, cadmium steam through vacuum fine furnace (6) upper outlet pipe out after enter back into condenser
(7) condensation in, forms liquid cadmium after condensation, the most condensed ingot casting of liquid cadmium obtains pure cadmium ingot, high temperature rectifying
The impurity that melting produces flows out from vacuum fine furnace (6) bottom discharging opening becomes rectifying slag, and rectifying slag can be separately
Recycling.
The method of the fused solution the most according to claim 1 thick cadmium direct rectifying of liquid, it is characterised in that described
In vacuum fine furnace (6), high temperature rectifying fusion process adds sodium metaphosphate, the temperature of 600～700 DEG C
Under carry out deep impurity-removing, reduce further the impurity content in thick cadmium liquid.
3. according to the right method asking the thick cadmium direct rectifying of liquid of the fused solution described in 1, it is characterised in that:
The temperature of thick cadmium liquid is 500～600 DEG C, controls thick cadmium by the high temperature resistant special service valve of fusant without trench metal (2)
Opening or closing of smelting furnace drain hole (2), is controlled to open valve 5 minutes at interval of 60 minutes by PLC control system,
Control to put thick cadmium liquid measure, thus reach to control the purpose of vacuum fine furnace inlet amount.
4. the method becoming the thick cadmium direct rectifying of liquid of the fused solution described in 1 according to claim, it is characterised in that
500 DEG C～700 DEG C of high-temperature fusion liquid thick cadmium liquid are directly entered vacuum fine furnace and carry out rectifying.
5. the method becoming the thick cadmium direct rectifying of liquid of the fused solution described in 1 according to claim, it is characterised in that
Drain hole (2) outlet of described thick cadmium smelting furnace (1) is to extend in moderate soak stove (4), and by alkali
In the thick cadmium liquid that liquid covers.
The method of the fused solution the most according to claim 1 thick cadmium direct rectifying of liquid, it is characterised in that institute
State and be provided with electric heating tube at drain hole (2) the outer wall circumference of thick cadmium smelting furnace (1) and use parcel insulation material
Mode is incubated.
7. the method becoming the thick cadmium direct rectifying of liquid of the fused solution described in 1 according to claim, it is characterised in that
The cadmium of described fused solution is during thick cadmium smelting furnace (1) to vacuum fine furnace (6), by being precisely controlled
System allows temperature be maintained at 600～700 DEG C.
The method of the fused solution the most according to claim 1 thick cadmium direct rectifying of liquid, it is characterised in that institute
State siphon pipe (5) gating location and be located at least in moderate soak stove (4) inner bottom part 20～30cm height, allow
The relatively small number of thick cadmium liquid flow of moderate soak stove (4) internal upper part lead content could enter in vacuum fine furnace.
The method of the fused solution the most according to claim 1 thick cadmium direct rectifying of liquid, it is characterised in that institute
State and a certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), refer to every 5 minutes pass through automatic feeding mechanism
Add cadmium Cd content be 70～85%, weight be that the cadmium cake of 10～25kg is to melting in thick cadmium smelting furnace (1).
The method of the fused solution the most according to claim 1 thick cadmium direct rectifying of liquid, it is characterised in that
Moderate soak stove (4) bottom opens a discharging opening in advance；It is provided with electrical heating at moderate soak stove (4) outer wall circumference
Manage and use parcel insulation material mode to be incubated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610427401.4A CN105861853B (en) | 2016-06-16 | 2016-06-16 | A kind of method of the thick direct rectifying of cadmium liquid of fused solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610427401.4A CN105861853B (en) | 2016-06-16 | 2016-06-16 | A kind of method of the thick direct rectifying of cadmium liquid of fused solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105861853A true CN105861853A (en) | 2016-08-17 |
| CN105861853B CN105861853B (en) | 2018-04-06 |
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| CN201610427401.4A Active CN105861853B (en) | 2016-06-16 | 2016-06-16 | A kind of method of the thick direct rectifying of cadmium liquid of fused solution |
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| CN (1) | CN105861853B (en) |
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| CN107674995A (en) * | 2017-11-09 | 2018-02-09 | 南丹县南方有色金属有限责任公司 | Cadmium reduction furnace and its manufacture craft |
| CN112370810A (en) * | 2020-09-30 | 2021-02-19 | 南通新邦化工科技有限公司 | Method and device for recycling easily oxidized and easily solidified chemical materials |
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| CN107674995A (en) * | 2017-11-09 | 2018-02-09 | 南丹县南方有色金属有限责任公司 | Cadmium reduction furnace and its manufacture craft |
| CN112370810A (en) * | 2020-09-30 | 2021-02-19 | 南通新邦化工科技有限公司 | Method and device for recycling easily oxidized and easily solidified chemical materials |
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| CN105861853B (en) | 2018-04-06 |
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