CN105861853B - A kind of method of the thick direct rectifying of cadmium liquid of fused solution - Google Patents
A kind of method of the thick direct rectifying of cadmium liquid of fused solution Download PDFInfo
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- CN105861853B CN105861853B CN201610427401.4A CN201610427401A CN105861853B CN 105861853 B CN105861853 B CN 105861853B CN 201610427401 A CN201610427401 A CN 201610427401A CN 105861853 B CN105861853 B CN 105861853B
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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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Abstract
The method that the present invention discloses a kind of thick direct rectifying of cadmium liquid of fused solution, by the melting into thick cadmium smelting furnace of cadmium cake, smelting temperature is 500~700 DEG C, and the additional proportion of sodium hydroxide is 15~16：100, the additional proportion of reducing agent is 1~2：100, make impurity Zn, Pb, Cu and NaOH reaction generation sodium salt, it is referred to as alkaline residue, the density of alkaline residue density ratio cadmium is small and forms layering, and float on above cadmium liquid, the a small amount of CdO wrapped up simultaneously in alkaline residue is reduced agent and is reduced into cadmium metal, removes impurity by timing cleaning alkaline residue, obtains ＞ containing Cd 98%, Zn ＜ 0.05% thick cadmium liquid；Thick cadmium liquid is flowed out by thick cadmium melting furnace bottom by the drain hole controlled without trench metal fusant special service valve, flows into moderate soak stove；Thick cadmium liquid in moderate soak stove is drawn into vacuum fine furnace by the siphon pipe of vacuum fine furnace carries out 400~500 DEG C of high temperature rectifying, because the volatilization temperature of cadmium is far below impurity element volatilization temperature, liquid cadmium forms cadmium steam, is condensed into liquid cadmium or pure cadmium ingot within the condenser.
Description
Technical field
The present invention relates to a kind of method of the thick direct rectifying of cadmium liquid 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 during boiling roaster, and flue dust passes through
Cadmium enters leachate after leaching, and leachate purifies by zinc powder, obtains copper-cadmium slag, again by leaching, zinc dust precipitation obtains copper-cadmium slag
To Spongy Cadmium and copper ashes, Spongy Cadmium is squeezed into fine and close cadmium cake by cooked flake wrapping machine.Cadmium cake typically contains cadmium 70~85%, containing zinc 3~
5%.
In the existing technology that pure cadmium ingot is produced using cadmium cake, cadmium cake is melted at 500~700 DEG C, and add hydrogen-oxygen
After changing sodium, reducing agent removing impurity and reduction, the thick cadmium liquid containing cadmium more than 98% casts thick cadmium ingot.Thick cadmium ingot is through further rectifying
After cast pure cadmium ingot.Its technique is generally：Spongy Cadmium → cadmium cake → thick refining → thick cadmium ingot → rectifying → ingot casting → pure cadmium ingot.Due to
Thick cadmium liquid can not directly carry out rectifying in thick furnace, so as to have to after about 600 DEG C of thick cadmium liquid are cooled down ingot castings, then send rectifying
Stove is warmed to 400~500 DEG C of progress high temperature rectifying, and the thick a large amount of sensible heats of cadmium liquid of high temperature can not utilize, and cause high energy consumption.
In the research and practice process to the method, the inventors found that：Above-mentioned technique solves well
The problem of zinc wet smelting process production Spongy Cadmium recovery cadmium, but melt after thick cadmium liquid need to cool down ingot casting and give in removal process high temperature
Rectifying furnace carries out rectifying, and the thick cadmium liquid heat content of high-temperature fusion can not utilize, and adds Spongy Cadmium recovery energy consumption, finally increases its production
Cost.
The content of the invention
To overcome above-mentioned prior art problem to be present, the present invention proposes a kind of thick direct rectifying of cadmium liquid of new fused solution
Method.The present invention can reduce energy consumption, raising automaticity, reduction production cost, improvement operating environment, reduction engineering and make
Valency.
A kind of the step of thick cadmium liquid of fused solution of the present invention direct rectificating method fusion process, includes：Thick refining, sodium metaphosphate
Removal of impurities, blowing, distillation process；Wherein
First, thick refining：A certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), smelting temperature is 500 DEG C~700 DEG C,
The ratio of addition sodium hydroxide, sodium hydroxide and cadmium cake is 15~16：100, reducing agent is added, reducing agent and cadmium cake ratio are 1
~2：100, make impurity Zn, Pb, Cu and NaOH reaction generation sodium salt in cadmium cake, the density of its density ratio cadmium is small and forms layering,
And float on above cadmium liquid, while a small amount of CdO wrapped up in alkaline residue is reduced agent and is reduced into cadmium metal, is removed by timing cleaning alkaline residue
Decontamination, obtain ＞ containing Cd 98%, Zn ＜ 0.05%, Pb<0.4% thick cadmium liquid；
2nd, sodium metaphosphate cleans：Add sodium metaphosphate removal of impurities, its add the ratio of sodium metaphosphate and thick cadmium liquid be 1~
2：100, smelting temperature is 600~700 DEG C, and smelting time is 1~2h, and scum silica frost is skimmed, and thick cadmium liquid contains Pb<0.01%；
3rd, blowing：Thick cadmium flow quantity by thick cadmium smelting furnace (1) bottom through being controlled without trench metal fusant special service valve (3),
Flowed directly out from drain hole (2) into moderate soak stove (4), thick cadmium liquid temperature control is 380~450 DEG C；
4th, rectifying:Moderate soak stove (4) is connected with vacuum fine furnace (6) by siphon pipe (5), in moderate soak stove (4)
Thick cadmium liquid be drawn into vacuum by siphon pipe (5)<In 25Pa vacuum fine furnace (6), thick cadmium liquid is in vacuum fine furnace (6)
In with 400~500 DEG C of progress high temperature rectifying meltings, liquid cadmium is changed into steam state cadmium, then cadmium steam, and cadmium steam is through vacuum fine furnace
(6) top escape pipe, which enters, forms liquid cadmium after condensation in condenser (7), condensed ingot casting obtains pure cadmium ingot to liquid cadmium again, very
Impurity in empty rectifying furnace (6) exits into rectifying slag from bottom discharging opening, and rectifying slag can be recycled separately.
It is described to add sodium metaphosphate in vacuum fine furnace (6) high temperature rectifying fusion process, in 600~700 DEG C of temperature
Lower carry out deep impurity-removing, further reduces the impurity content in thick cadmium liquid.
The temperature of thick cadmium liquid is 500~600 DEG C, controls thick cadmium to melt without trench metal fusant special service valve (2) by high temperature resistant
The on or off of furnace drain hole (2), opened valve 5 minutes at interval of 60 minutes by PLC control system control, thick cadmium liquid is put in control
Amount, so as to reach the purpose of control vacuum fine furnace inlet amount.
500 DEG C~700 DEG C thick cadmium liquid of high-temperature fusion liquid are directly entered vacuum fine furnace and carry out rectifying.
Drain hole (2) outlet of the thick cadmium smelting furnace (1) is extend into moderate soak stove (4), and is covered by alkali lye
Thick cadmium liquid in.
Electric heating tube is provided with drain hole (2) outer wall circumference of the thick cadmium smelting furnace (1) and using parcel insulation material
Mode is incubated.
During the cadmium of the fused solution is from thick cadmium smelting furnace (1) to vacuum fine furnace (6), pass through precisely controlling system
Temperature is allowed to be maintained at 600~700 DEG C.
Siphon pipe (5) gating location is located at least in moderate soak stove (4) 20~30cm of inner bottom part height, allows centre
The relatively small number of thick cadmium liquid stream of holding furnace (4) internal upper part lead content could enter in vacuum fine furnace.
It is described that a certain amount of cadmium cake is put into melting in thick cadmium smelting furnace (1), refer to pass through automatic feeding mechanism in every 5 minutes
One cadmium Cd content of addition is 70~85%, cadmium cake melting into thick cadmium smelting furnace (1) that weight is 10~25kg.
A discharging opening is opened in advance in moderate soak stove (4) bottom；Set at the outer wall circumference of the whole moderate soak stove (4)
There is electric heating tube and moderate soak stove (4) is incubated using parcel insulation material mode.
Working mechanism of the present invention：Because cadmium metal is very active, exposure is easily oxidized in atmosphere, therefore in melting
Surface need to cover alkali lye in journey, and alkali not only makes cadmium metal and air exclusion prevent from being oxidized, and reacts to be formed with impurity element
Alkaline residue, but alkaline residue viscosity is big, poor fluidity, easily causes drain hole blocking, and common blowing mode can not meet continuous vacuum
The uniform and stable feed needs of rectifying.Traditional handicraft is that thick cadmium liquid first is cast into thick cadmium ingot, i.e., slightly refining and refining are relative for cadmium
Independent production organizational mode, it is desirable to it is low, it is adapted to manual operation, but long flow path, high energy consumption.
Cadmium is slightly refined and refined from two flows being independently interrupted by the present invention is changed to continuous processing flow, i.e. fused solution
The mode of production of the direct rectifying of thick cadmium liquid, and using addition, sodium metaphosphate progress depth removes lead twice, and thick cadmium liquid is greatly reduced
Impurity content, realize and reach the purpose of reduction production cost by reducing energy consumption, and improve automatization level.The present invention is by 500
The thick cadmium liquid of~700 DEG C of high-temperature fusion liquid is by thick cadmium melting furnace bottom by the drain hole that is controlled without trench metal fusant special service valve
Outflow, moderate soak stove is flowed into, stable, uniform, the continuous supply thick cadmium liquid raw material mode of liquid is realized using moderate soak stove；In
Between thick cadmium liquid in holding furnace siphon pipe (stainless steel siphon pipe) be connected with by moderate soak stove and vacuum fine furnace again sucked
High temperature rectifying (400~500 DEG C) is carried out into vacuum fine furnace, a sodium metaphosphate progress depth is added and removes lead, due to cadmium
Volatilization temperature is far below impurity element (Pb, Zn, Tl, Fe, Cu, Ni, Sn, Sb, Ag) volatilization temperature, so as to allow liquid cadmium to form cadmium
Steam, and liquid cadmium is condensed within the condenser.
Because the cadmium liquid of molten condition easily aoxidizes, exposure is oxidized to cadmium oxide, the cadmium of flow regime at once in atmosphere
Oxygen intense reaction in liquid and air can produce substantial amounts of tobacco (oxidation cadmium fumes), cadmium oxide for can carcinogen, to behaviour
The health for making personnel causes grave danger, and the present invention extend into middle guarantor using thick cadmium smelting furnace drain hole (2) discharging opening
In the internal thick cadmium liquid of liquid covered by alkali lye of warm stove (4), so as to prevent thick cadmium liquid and air contact.
321 DEG C of the fusing point of cadmium to the temperature difference regions of 500 DEG C~700 DEG C of the smelting temperatures only very little of thick cadmium, thick cadmium liquid by
Temperature can decline some and result in solid-state cadmium during outlet outflow, solid-state cadmium can cause the blocking in exit, it is necessary to it is artificial frequently
Cleaning, production efficiency is influenceed, and by manually heating scorification solid-state cadmium again, increase operating personnel contact machine with poison gas
Meeting, the operation requirement of the frequent blowing of continuous rectification can not be met.The present invention is provided with electricity at the outer wall circumference of whole drain hole (2)
Heating tube is simultaneously incubated using parcel insulation material mode simultaneously, it is ensured that and thick cadmium liquid will not be cooled into solid cadmium in drain hole (2),
And thick cadmium liquid can be put into moderate soak stove (4) from thick cadmium smelting furnace (1) at any time, its is simple to operate, ensures follow-up rectifying
The stabilization and quantitative feeding of operation, charging and yield are balanced, prevent from feeding excessive or very few cause pure cadmium product Pb contents to surpass
Mark, final production go out 99.995% pure cadmium product.
The mode of production that traditional thick cadmium liquid casts thick cadmium ingot can simply realize the control of inlet amount very much, as long as controlling
The burn-off rate can of thick cadmium ingot is realized.But the present invention cannot be led to using the direct vacuum fine furnace mode of production of fused solution
Cross similar mode realization, it is necessary to realized using non-traditional mode, then the present invention controls fused solution using precisely controlling system
The thick cadmium liquid of state is maintained at 600 DEG C~700 DEG C scopes in the temperature of vacuum fine furnace (6), works in coordination and realizes goal of the invention.
Because lead density is bigger than cadmium density, lead produces " sinking to the bottom " phenomenon due to gravity segregation in the thick cadmium liquid of molten condition,
Can cause moderate soak furnace bottom thick cadmium liquid can enriched lead, the accumulation through the short period, lead content meeting in moderate soak stove
Rise 10 times, cause the pure cadmium product lead doping of vacuum fine furnace output.The present invention is by the way that vacuum fine furnace is fed and siphon
Pipe outlet is placed positioned at having apart from moderate soak furnace bottom position at 20cm~30cm height, so as to allow in moderate soak stove
Lead content relatively small number of thick cadmium liquid stream in portion's could enter in vacuum fine furnace, prevent high leaded thick cadmium liquid from entering rectification under vacuum
In stove (6), it is ensured that final pure cadmium product quality.
In addition, being enriched with the more thick cadmium liquid of lead content in moderate soak stove to reduce, the present invention can also protect in centre
Warm furnace bottom opens a discharging opening in advance, and the thick cadmium liquid of enriched lead flows out from the discharging opening in certain time relief moderate soak stove 4.
It is miscellaneous to realize that depth removes the part such as Pb in thick cadmium liquid by adding different amounts of sodium metaphosphate twice by the present invention
Matter, so as to reduce Viscosity of Liquid Metal, improve the mobility of thick cadmium molten metal bath, this can also be prevented slightly on the other hand
Cadmium smelting furnace discharging opening blocks.
Above-mentioned technical proposal can be seen that because the embodiment of the present invention uses the side of the thick direct rectifying of cadmium liquid of fused solution
Method, therefore beneficial effects of the present invention：
1st, energy consumption is low：The present invention directly handles the thick cadmium liquid of fused solution, makes full use of the heat content of the thick cadmium liquid of high temperature, saves energy
Source.
2nd, automaticity is high：The present invention smelting process in Spongy Cadmium cake by automatic feeding device according to setting when
Between be spaced and be added in thick cadmium smelting furnace, realize the continuous production of thick cadmium melting；By automatically controlling thick cadmium smelting furnace drain hole
Opened or closed without trench metal fusant special service valve, realize automatically controlling for vacuum fine furnace charging, and realize thick refine and refining
Continuous production.
3rd, production cost is low：By automatically controlling the inlet amount of vacuum fine furnace, uniform feeding is realized, improves rectification under vacuum
The rectification efficiency of stove, save production cost.
4th, good operational environment：The thick cadmium liquid of smelting process fused solution of the present invention passes through moderate soak stove preservation and controlling flow
It is directly entered in vacuum fine furnace, cancels the operation of original thick cadmium ingot casting and thick cadmium ingot handling charging, simplification of flowsheet can
Operating environment is set further to improve.
5th, low cost：The smelting process of the present invention cancels casting and the recycling fusion process of thick cadmium liquid, has both reduced production
Equipment, production link, save construction investment again.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is the structural representation of use device of the present invention.
Fig. 3 is prior art processes flow chart.
In figure, 1-thick cadmium smelting furnace, 2-drain hole, 3-without trench metal fusant special service valve, 4-moderate soak stove,
5-siphon pipe, 6-vacuum fine furnace, 7-condenser, 8-pig moulding machine.
Embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
The inventive method includes：The cadmium cake that a weight is 10kg~25kg is added by automatic feeding mechanism within every 5 minutes
(Cd 70%~85%) melting into thick cadmium smelting furnace, smelting temperature are 500 DEG C~700 DEG C, and the additional proportion of sodium hydroxide is
15~16：100, the additional proportion of reducing agent (coal or wood) is 1~2：100, make impurity Zn, Pb, Cu and NaOH reaction generation
Sodium salt, alkaline residue is referred to as, the density of alkaline residue density ratio cadmium is small and forms layering, and floats on above cadmium liquid, while is wrapped up in alkaline residue
A small amount of CdO be reduced agent and be reduced into cadmium metal, impurity is removed by timing cleaning alkaline residue, obtains ＞ containing Cd 98%, Zn ＜
0.05% thick cadmium liquid；Thick cadmium liquid is by thick cadmium melting furnace bottom by the drain hole stream that is controlled without trench metal fusant special service valve
Go out, flow into moderate soak stove；Thick cadmium liquid in moderate soak stove is drawn into vacuum fine furnace by the siphon pipe of vacuum fine furnace
It is middle progress 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 cadmium within the condenser, then by condensation ingot casting
Pure cadmium ingot is obtained, impurity enters rectifying slag, can separately recycle, be described in detail individually below.
Embodiment 1
Feed intake first：375kg sodium hydroxides are put into 1m3Thick cadmium smelting furnace in, control smelting furnace heating-up temperature 450
DEG C, after sodium hydroxide fusing, temperature is raised to 650 DEG C.Dry weight 2.5t cadmium cake is logical (containing Cd73.45%, containing Zn4.56%)
Cross cadmium cake automatic feeding device to put into thick cadmium smelting furnace, and the raw coal (C55%) for adding 25kg is reduced.When setting feeds intake
Between be spaced, ensure cadmium cake addition be 200kg/h.The thick cadmium liquid about 1.1t of drain hole valve releasing is opened to treat into moderate soak stove
With through vacuum fine furnace rectifying, and casting obtains the pure cadmium ingot 1.08t that grade is 99.995%.
Continuous-stable feeds intake：Addition amount of sodium hydroxide 50kg/h, temperature control is at 650 DEG C.Cadmium 75.42% will be contained, containing zinc
3.56% Spongy Cadmium cake addition is 150kg/h.Put about 100kg's per thick cadmium smelting furnace drain hole valve is opened every other hour
Thick cadmium liquid carries out rectifying into vacuum fine furnace, per hour can output about 92kg pure cadmium liquid, after casting obtaining grade is
99.995% pure cadmium ingot.
Embodiment 2
375kg sodium hydroxides and dry weight 2.5t cadmium cake (containing Cd73.45%, Zn4.56%) are put into 1m3Thick cadmium
In smelting furnace, 450 DEG C of control smelting furnace heating-up temperature, after sodium hydroxide fusing, temperature is raised to 650 DEG C, and adds 25kg's
Raw coal (C55%) is reduced, and after melting 12 hours, is skimmed alkaline residue, is added 18kg sodium metaphosphates melting 1 hour, skim scum silica frost,
After obtaining qualified thick cadmium liquid, about 100kg thick cadmium liquid is put to pure cadmium per thick cadmium smelting furnace drain hole valve is opened every other hour
Carry out rectifying in rectifying furnace, after the thick cadmium liquid in thick cadmium smelting furnace discharges, carry out next cycle feed intake, melting operation, so follow
Ring.The mode that thick cadmium liquid is put by using two thick cadmium smelting furnace interruption meltings, intersection ensures that the thick cadmium liquid of pure cadmium rectifying furnace connects
Continuous supply, thick cadmium rectifying furnace per hour can output about 92kg pure cadmium liquid, the pure cadmium that grade is 99.995% is obtained after casting
Ingot.
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 | |
| It is total | 124 | 189071.0 | 1524.8 |
A kind of method of the thick direct rectifying of cadmium liquid of fused solution provided above the embodiment of the present invention, carry out in detail
Introduce, specific case used herein is set forth to the principle and embodiment of the present invention, the explanation of above example
It is only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, according to this
The thought of invention, there will be changes in specific embodiments and applications, in summary, this specification content should
It is interpreted as limitation of the present invention.
Claims (9)
- A kind of 1. method of the thick direct rectifying of cadmium liquid of fused solution, it is characterised in that include the step of its fusion process：It is thick to refine, partially Sodium phosphate removal of impurities, blowing, distillation process；First, thick refining：A certain amount of cadmium cake is put into thick cadmium smelting furnace（1）Middle melting, smelting temperature are 500 DEG C~700 DEG C, are added Sodium hydroxide cleans, and the ratio of sodium hydroxide and cadmium cake is 15~16：100, reducing agent is added, reducing agent and cadmium cake ratio are 1 ~2：100, make impurity Zn, Pb, Cu and NaOH reaction generation sodium salt in cadmium cake, the density of its density ratio cadmium is small and forms layering, And float on above cadmium liquid, while a small amount of CdO wrapped up in alkaline residue is reduced agent and is reduced into cadmium metal, is removed by timing cleaning alkaline residue Decontamination, obtain ＞ containing Cd 98%, Zn ＜ 0.05%, Pb<0.4% thick cadmium liquid；2nd, sodium metaphosphate cleans：Sodium metaphosphate removal of impurities is added, it is 1~2 that it, which adds sodium metaphosphate and the ratio of thick cadmium liquid,： 100, smelting temperature is 600~700 DEG C, and smelting time is 1~2h, and scum silica frost is skimmed, and thick cadmium liquid contains Pb<0.01%；3rd, blowing：Thick cadmium flow quantity passes through thick cadmium smelting furnace（1）Bottom is through without trench metal fusant special service valve（3）Control, from putting Material mouth（2）Flow directly out and enter moderate soak stove（4）, thick cadmium liquid temperature control is 380~450 DEG C；4th, rectifying:Moderate soak stove（4）With vacuum fine furnace（6）Pass through siphon pipe（5）Connection, moderate soak stove（4）In it is thick Cadmium liquid passes through siphon pipe（5）It is drawn into vacuum<25Pa vacuum fine furnace（6）In, thick cadmium liquid is in vacuum fine furnace（6）In with 400~500 DEG C of progress high temperature rectifying meltings, liquid cadmium are changed into steam state cadmium, and steam state cadmium then claims cadmium steam；Cadmium steam is through rectification under vacuum Stove（6）Upper outlet pipe enters back into condenser after coming out（7）Middle condensation, liquid cadmium, the condensed casting again of liquid cadmium are formed after condensation Ingot obtains pure cadmium ingot, and impurity caused by high temperature rectifying melting is from vacuum fine furnace（6）Bottom discharging opening outflow turns into rectifying slag, essence Still residue can be recycled separately；The thick cadmium smelting furnace（1）Drain hole（2）Outlet is to extend into moderate soak stove（4）It is interior, and by the thick of alkali lye covering In cadmium liquid.
- 2. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim 1, it is characterised in that described in vacuum fine Furnace（6）High temperature rectifying fusion process adds sodium metaphosphate, and deep impurity-removing is carried out at a temperature of 600~700 DEG C, enters one Step reduces the impurity content in thick cadmium liquid.
- 3. the method for the thick direct rectifying of cadmium liquid of fused solution described in asking 1 is used according to right, it is characterised in that：The step 1 is thick The temperature of cadmium liquid is 500~600 DEG C, by high temperature resistant without trench metal fusant special service valve（2）Control thick cadmium smelting furnace drain hole （2）On or off, opened valve 5 minutes at interval of 60 minutes by PLC control system control, thick cadmium liquid measure is put in control, so as to reach To the purpose of control vacuum fine furnace inlet amount.
- 4. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim into 1, it is characterised in that by 500 DEG C~ The thick cadmium liquid of 700 DEG C of high-temperature fusion liquid is directly entered vacuum fine furnace and carries out rectifying.
- 5. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim 1, it is characterised in that the thick cadmium melting Stove（1）Drain hole（2）Electric heating tube is provided with outer wall circumference and is incubated using parcel insulation material mode.
- 6. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim into 4, it is characterised in that the fused solution State cadmium is from thick cadmium smelting furnace（1）To vacuum fine furnace（6）During, it is maintained at 600~700 by temperature by precisely controlling system ℃。
- 7. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim 1, it is characterised in that the siphon pipe（5） Gating location is located at moderate soak stove（4）20~30cm of inner bottom part height, allows moderate soak stove（4）Internal upper part lead content is relative Less thick cadmium liquid stream could enter in vacuum fine furnace.
- 8. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim 1, it is characterised in that it is described will be a certain amount of Cadmium cake be put into thick cadmium smelting furnace（1）Middle melting, refer to every 5 minutes by automatic feeding mechanism add cadmium content be 70~ 85%th, weight is 10~25kg cadmium cake to thick cadmium smelting furnace（1）Middle melting.
- 9. the method for the thick direct rectifying of cadmium liquid of fused solution according to claim 1, it is characterised in that in moderate soak stove （4）A discharging opening is opened in advance in bottom；Moderate soak stove（4）Electric heating tube is provided with outer wall circumference and using parcel insulation material side Formula is incubated.
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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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| JPH02285037A (en) * | 1989-04-26 | 1990-11-22 | Nkk Corp | Slag refining method for molten metal |
| CN100336922C (en) * | 2005-10-08 | 2007-09-12 | 昆明理工大学 | Vacuum smelting method for high-thallium coarse cadmium |
| CN101942564B (en) * | 2010-08-21 | 2013-09-25 | 赵志强 | Process for producing pure cadmium by continuous reduction and distillation of zinc cadmium slag and sponge cadmium |
| CN103924095B (en) * | 2014-04-28 | 2016-05-25 | 北京矿冶研究总院 | Novel method for recovering cadmium from copper-cadmium slag |
| CN203807536U (en) * | 2014-04-28 | 2014-09-03 | 蒙自矿冶有限责任公司 | Poisoning-avoiding energy-saving efficient cadmium continuous production equipment |
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