CN107475524A - A kind of cadmium alkaline residue processing method - Google Patents
A kind of cadmium alkaline residue processing method Download PDFInfo
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- CN107475524A CN107475524A CN201710796953.7A CN201710796953A CN107475524A CN 107475524 A CN107475524 A CN 107475524A CN 201710796953 A CN201710796953 A CN 201710796953A CN 107475524 A CN107475524 A CN 107475524A
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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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
- C22B17/04—Obtaining cadmium by wet processes
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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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
This application discloses a kind of cadmium alkaline residue processing method, cadmium alkaline residue is dissolved in water, and obtains the first suspension；First suspension carries out the first filtering, obtains the first filtrate and the first filter residue, and the first filter residue is reduced, and thick cadmium is made；First filtrate adds acid for adjusting pH, generation precipitation, obtains the second suspension containing precipitation；Second suspension carries out the second filtering, obtains the second filtrate and the second filter residue, and the second filter residue returns to smelting procedure；Second filtrate is crystallized, and sloughs moisture.The cadmium alkaline residue processing method of the present invention, simple to operate, cost is low, pollution-free, and can reclaim valuable raw material in cadmium alkaline residue.
Description
Technical field
The application is related to technical field of wet metallurgy, more particularly to a kind of free of contamination processing method of cadmium alkaline residue.
Background technology
During the thick cadmium of Spongy Cadmium low-temperature molten salt also original production, generate alkaline residue, the composition of alkaline residue be mainly cadmium oxide,
Cadmium metal, sodium zincate, sodium carbonate, sodium hydroxide etc..In general processing method is to neutralize cadmium alkaline residue with spent acid, is had caused
Evil sludge is focused on.The loss of metal, energy waste are thus caused, while also pollutes environment.
The content of the invention
In order to solve the above technical problems, first purpose of the present invention operates letter to provide a kind of cadmium alkaline residue processing method
Single, cost is low, pollution-free, and can reclaim valuable raw material in cadmium alkaline residue.
Technical scheme provided by the invention is as follows：
A kind of cadmium alkaline residue processing method, comprises the following steps：
1) cadmium alkaline residue adds water, dissolving, obtains the first suspension；
2) the first suspension carries out the first filtering, obtains the first filtrate and the first filter residue, and the first filter residue is reduced, and is made
Thick cadmium；First filtrate adds acid for adjusting pH, generation precipitation, obtains the second suspension containing precipitation；
3) the second suspension carries out the second filtering, obtains the second filtrate and the second filter residue, and the second filter residue returns to smelting procedure；
Second filtrate is crystallized, and sloughs moisture.
Preferably, the cadmium alkaline residue is caused cadmium alkaline residue in the thick cadmium process of Spongy Cadmium also original production.
Preferably, in the step 1), cadmium alkaline residue adds production waste water and dissolved, the cadmium alkaline residue and production waste water
Weight ratio is 1:4-10.
Preferably, in the step 1), the dissolving uses stirring and dissolving, dissolution time 0.5-3h.
Preferably, first filtering, the second filtering are using any one method in filtering, press filtration, suction filtration, centrifugation.
Preferably, in the step 2), the first filtrate adds dilute sulfuric acid or salt acid for adjusting pH.
Preferably, in the step 2), pH to 6.8-10 is adjusted.
Preferably, in the step 3), the second filtrate sloughs moisture using the method for evaporative crystallization or crystallisation by cooling.
Preferably, in the step 3), when using dilute sulfuric acid or salt acid for adjusting pH, the second filtrate is heated to boiling
Rise, evaporative crystallization, obtain anhydrous sodium sulfate or sodium chloride.
Preferably, in the step 3), when using dilute sulfuric acid regulation pH, the second filtrate crystallisation by cooling, hydration sulphur is made
Sour sodium.
Caused cadmium alkaline residue in cadmium alkaline residue handled by the present invention, the mainly thick cadmium process of Spongy Cadmium also original production, it is led
It is cadmium oxide, cadmium metal, sodium zincate, sodium carbonate, sodium hydroxide etc. to want composition.Cadmium alkaline residue is dissolved, precipitated by the present invention
Operation, the metals such as recovery cadmium, zinc are realized, and raw material of industry sodium chloride, sodium sulphate, hydrated sulfuric acid sodium etc. can be generated, reduce a huge sum of money
Belong to the pollution of ion pair environment.
Compared to the method for other processing cadmium alkaline residues, the cadmium alkaline residue handled by the present invention, from Spongy Cadmium also original production
Caused cadmium alkaline residue in thick cadmium process, mainly contains cadmium oxide, cadmium metal, sodium zincate, sodium carbonate, sodium hydroxide etc., with other
The composition of cadmium alkaline residue is distinct.More cuprics, chlorine, iron in other kinds of cadmium alkaline residue, complex treatment process, it is difficult to by cadmium oxide
It is separated by filtration, after acid adding, it is also necessary to come out with zinc dust precipitation cadmium, cost is higher.And the cadmium handled by the method for the present invention
Alkaline residue, because raw material sources in thick cadmium produce caused cadmium alkaline residue in pure cadmium technique, composition is different, therefore can use the present invention
Method handled.
Cadmium alkaline residue can dissolve using clean water or production waste water, in industrial continuous production, each pure cadmium workshop, and such as pure cadmium
The processes such as washing, flue gas dust collection produce waste water, it is necessary to which expending energy carries out purified treatment, by industrial wastewater for cadmium alkaline residue
Dissolving, the recovery of cadmium alkali metal in the dreg and other raw materials, clean water resource used can be saved, while utilize waste water, reduced
Process needed for wastewater treatment and energy consumption, realize that waste water, waste residue are combined with.Generally, cadmium alkaline residue is with the weight ratio for producing waste water
1:4-10, i.e. 1 ton of cadmium alkaline residue add 4-10 tons production waste water and dissolved.Cadmium, zinc in the amount and cadmium alkaline residue of the water of addition etc.
Constituent content is relevant, the more water that can increase addition of the constituent content such as amount, zinc of the more water that can reduce addition of cadmium content
Amount.In actual production, cadmium alkaline residue can be used with producing the weight ratio of waste water as 1:5-6, i.e. 1 ton of cadmium alkaline residue add 5-6 tons
Production waste water is dissolved.Also it can dissolve using clean water, it is consistent with the dosage using production waste water and effect.
Stirring can accelerate the process that cadmium alkaline residue dissolves, and can be dissolved cadmium alkaline residue in 0.5-3h, it is contemplated that production effect
Rate, 1-2h mixing time is used in usual industrial production.Due to containing sodium zincate in cadmium alkaline residue, and the process of sodium zincate dissolving
Itself be the process of a heat release, thus using clean water or waste water carry out dissolving operation when, there is no special demand to temperature,
It can need not carry out heating operation.
After stirring and dissolving, sodium zincate, sodium carbonate, sodium hydroxide and other matter are dissolved in the water, and insoluble precipitation is mainly
Cadmium metal, cadmium oxide.
First filtering, the second filtering can use any one method in common filtering, press filtration, suction filtration, centrifugation to carry out
Operation.Suction filtration utilize negative pressure, and centrifugation utilize centrifugal force, as a rule small or be not easy the material being dehydrated suitable for amount.Production scale
Greatly, medium is relatively easy to separated then more using the method separation solid and solution of press filtration.In field of hydrometallurgy, press filtration be compared with
For conventional method.In the present invention, when the cadmium alkaline residue amount of processing is more, because the solution being easily separated and insoluble solid sink
Form sediment, the method for often selecting press filtration.
Main component in first filter residue is insoluble in the cadmium metal of water, cadmium oxide, and the first filter residue is reduced, can be with
Obtain thick cadmium.In industrial production restoring operation is carried out usually using reduction furnace.Thick cadmium further refining can prepare pure cadmium, or be used for
In other industrial productions, the recycling to cadmium is realized, avoids cadmium from being discharged into environment, influence Environmental security and the health of human body.
Main component in first filtrate is sodium zincate, sodium carbonate, sodium hydroxide and other matter, uses acid for adjusting pH to 6.8-
When 10, basic zinc carbonate precipitation or zinc hydroxide precipitation will be generated in solution, obtains the second suspension containing precipitation.Now enter
Row second filters, and obtains the second filtrate and the second filter residue, and the second filter residue is mainly basic zinc carbonate precipitation or zinc hydroxide precipitation,
Smelting procedure is returned, reclaims metallic zinc.The acid added in first filtrate can be inorganic acid, as long as do not possess strong oxidizing property
Acid can be used.Because acid such as nitric acid, the concentrated sulfuric acid with strong oxidizing property can react with metal, therefore can not use
In the application.In view of the cost and efficiency of commercial Application, usually using dilute sulfuric acid or salt acid for adjusting pH.Dilute sulfuric acid refers to solute
The aqueous solution of sulfuric acid of the mass fraction less than or equal to 70%, because the sulfuric acid molecule in dilute sulfuric acid has been ionized completely, institute
Do not have the strong oxidizing property of the concentrated sulfuric acid with dilute sulfuric acid.And pH is controlled in the range of 6.8-10, basic carbonate will be generated in solution
Zinc is precipitated or zinc hydroxide precipitation, both materials are used for zinc metallurgical process, and smelting will not be had an impact.In addition, when use
During dilute sulfuric acid, pH will not produce sodium hydroxide and zinc sulfate precipitation in the range of 6.8-10.Sodium sulphate is still in solution.
It can be also stable in the presence of using the sodium chloride that hydrochloric acid generates in the range of pH is 6.8-10 in solution.
The method that second filtrate can use evaporative crystallization or crystallisation by cooling, sloughs moisture.From which kind of method with adding
Sour species it is relevant.Dilute sulfuric acid or salt acid for adjusting pH are usually added into, when using hydrochloric acid, because the salt sodium chloride of formation is not
Dissolubility difference very little under synthermal, so sloughing moisture from the method for explosive evaporation crystallization.When using dilute sulfuric acid,
Different products can be obtained under different crystallization conditions, when being crystallized using explosive evaporation, moisture is evaporated to obtain anhydrous sodium sulfate；
When using crystallisation by cooling, such as fast cooling to -6 DEG C of crystallisation by cooling, the crystal now separated out is hydrated sulfuric acid sodium, i.e. saltcake.
The factors such as the use range of the product obtained in view of evaporative crystallization, market sale, usually using sulphur acid for adjusting pH, prepare anhydrous
Sodium sulphate or saltcake.
Second filtrate is crystallized, and yield is relevant with the sour amount added.The waste that crystallization process does not have material is free of it
Its impurity.Without carrying out subsequent treatment again.
Cadmium alkaline residue processing method provided by the invention, technique is simple, and equipment investment is few, and zinc and cadmium can be reclaimed and reclaimed
Rate is high, and sodium sulfate byproduct has good economic value, is a kind of alkaline residue without the pollution of waste water, waste, heavy metal ion
The new technology of processing.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
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 described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the process chart of the embodiment of the present invention；
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, it is real below in conjunction with the application
The accompanying drawing in example is applied, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described implementation
Example only some embodiments of the present application, rather than whole embodiments.It is common based on the embodiment in the application, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, it should all belong to the application protection
Scope.
Please be as shown in figure 1, a kind of cadmium alkaline residue processing method of offer of the embodiment of the present invention, comprises the following steps：
1) cadmium alkaline residue adds water, dissolving, obtains the first suspension；
2) the first suspension carries out the first filtering, obtains the first filtrate and the first filter residue, and the first filter residue is reduced, and is made
Thick cadmium；First filtrate adds acid for adjusting pH, generation precipitation, obtains the second suspension containing precipitation；
3) the second suspension carries out the second filtering, obtains the second filtrate and the second filter residue, and the second filter residue returns to smelting procedure；
Second filtrate is crystallized, and sloughs moisture.
Preferably, the cadmium alkaline residue is caused cadmium alkaline residue in the thick cadmium process of Spongy Cadmium also original production.
Caused cadmium alkaline residue in cadmium alkaline residue handled by the present invention, the mainly thick cadmium process of Spongy Cadmium also original production, it is led
It is cadmium oxide, cadmium metal, sodium zincate, sodium carbonate, sodium hydroxide etc. to want composition.Cadmium alkaline residue is dissolved, precipitated by the present invention
Operation, the metals such as recovery cadmium, zinc are realized, and raw material of industry sodium chloride, sodium sulphate, hydrated sulfuric acid sodium etc. can be generated, reduce a huge sum of money
Belong to the pollution of ion pair environment.
Compared to the method for other processing cadmium alkaline residues, the cadmium alkaline residue handled by the present invention, from Spongy Cadmium also original production
Caused cadmium alkaline residue in thick cadmium process, mainly contains cadmium oxide, cadmium metal, sodium zincate, sodium carbonate, sodium hydroxide etc., with other
The composition of cadmium alkaline residue is distinct.More cuprics, chlorine, iron in other kinds of cadmium alkaline residue, complex treatment process, it is difficult to by cadmium oxide
It is separated by filtration, after acid adding, it is also necessary to come out with zinc dust precipitation cadmium, cost is higher.And the cadmium handled by the method for the present invention
Alkaline residue, because raw material sources in thick cadmium produce caused cadmium alkaline residue in pure cadmium technique, composition is different, therefore can use the present invention
Method handled.
Preferably, in the step 1), cadmium alkaline residue adds production waste water and dissolved, the cadmium alkaline residue and production waste water
Weight ratio is 1:4-10.
Cadmium alkaline residue can dissolve using clean water or production waste water, in industrial continuous production, each pure cadmium workshop, and such as pure cadmium
The processes such as washing, flue gas dust collection produce waste water, it is necessary to which expending energy carries out purified treatment, by industrial wastewater for cadmium alkaline residue
Dissolving, the recovery of cadmium alkali metal in the dreg and other raw materials, clean water resource used can be saved, while utilize waste water, reduced
Process needed for wastewater treatment and energy consumption, realize that waste water, waste residue are combined with.Generally, cadmium alkaline residue is with the weight ratio for producing waste water
1:4-10, i.e. 1 ton of cadmium alkaline residue add 4-10 tons production waste water and dissolved.Cadmium, zinc in the amount and cadmium alkaline residue of the water of addition etc.
Constituent content is relevant, the more water that can increase addition of the constituent content such as amount, zinc of the more water that can reduce addition of cadmium content
Amount.In actual production, cadmium alkaline residue can be used with producing the weight ratio of waste water as 1:5-6, i.e. 1 ton of cadmium alkaline residue add 5-6 tons
Production waste water is dissolved.Also it can dissolve using clean water, it is consistent with the dosage using production waste water and effect.
Preferably, in the step 1), the dissolving uses stirring and dissolving, dissolution time 0.5-3h.
Stirring can accelerate the process that cadmium alkaline residue dissolves, and can be dissolved cadmium alkaline residue in 0.5-3h, it is contemplated that production effect
Rate, 1-2h mixing time is used in usual industrial production.Due to containing sodium zincate in cadmium alkaline residue, and the process of sodium zincate dissolving
Itself be the process of a heat release, thus using clean water or waste water carry out dissolving operation when, there is no special demand to temperature,
It can need not carry out heating operation.
After stirring and dissolving, sodium zincate, sodium carbonate, sodium hydroxide and other matter are dissolved in the water, and insoluble precipitation is mainly
Cadmium metal, cadmium oxide.
Preferably, first filtering, the second filtering are using any one method in filtering, press filtration, suction filtration, centrifugation.
First filtering, the second filtering can use any one method in common filtering, press filtration, suction filtration, centrifugation to carry out
Operation.Suction filtration utilize negative pressure, and centrifugation utilize centrifugal force, as a rule small or be not easy the material being dehydrated suitable for amount.Production scale
Greatly, medium is relatively easy to separated then more using the method separation solid and solution of press filtration.In field of hydrometallurgy, press filtration be compared with
For conventional method.In the present invention, when the cadmium alkaline residue amount of processing is more, because the solution being easily separated and insoluble solid sink
Form sediment, the method for often selecting press filtration.
Main component in first filter residue is insoluble in the cadmium metal of water, cadmium oxide, and the first filter residue is reduced, can be with
Obtain thick cadmium.In industrial production restoring operation is carried out usually using reduction furnace.Thick cadmium further refining can prepare pure cadmium, or be used for
In other industrial productions, the recycling to cadmium is realized, avoids cadmium from being discharged into environment, influence Environmental security and the health of human body.
Preferably, in the step 2), the first filtrate adds dilute sulfuric acid or salt acid for adjusting pH.
Preferably, in the step 2), pH to 6.8-10 is adjusted.
Main component in first filtrate is sodium zincate, sodium carbonate, sodium hydroxide and other matter, uses acid for adjusting pH to 6.8-
When 10, basic zinc carbonate precipitation or zinc hydroxide precipitation will be generated in solution, obtains the second suspension containing precipitation.Now enter
Row second filters, and obtains the second filtrate and the second filter residue, and the second filter residue is mainly basic zinc carbonate precipitation or zinc hydroxide precipitation,
Smelting procedure is returned, reclaims metallic zinc.The acid added in first filtrate can be inorganic acid, as long as do not possess strong oxidizing property
Acid can be used.Because acid such as nitric acid, the concentrated sulfuric acid with strong oxidizing property can react with metal, therefore can not use
In the application.In view of the cost and efficiency of commercial Application, usually using dilute sulfuric acid or salt acid for adjusting pH.Dilute sulfuric acid refers to solute
The aqueous solution of sulfuric acid of the mass fraction less than or equal to 70%, because the sulfuric acid molecule in dilute sulfuric acid has been ionized completely, institute
Do not have the strong oxidizing property of the concentrated sulfuric acid with dilute sulfuric acid.And pH is controlled in the range of 6.8-10, basic carbonate will be generated in solution
Zinc is precipitated or zinc hydroxide precipitation, both materials are used for zinc metallurgical process, and smelting will not be had an impact.In addition, when use
During dilute sulfuric acid, pH will not produce sodium hydroxide and zinc sulfate precipitation in the range of 6.8-10.Sodium sulphate is still in solution.
It can be also stable in the presence of using the sodium chloride that hydrochloric acid generates in the range of pH is 6.8-10 in solution.
Preferably, in the step 3), the second filtrate sloughs moisture using the method for evaporative crystallization or crystallisation by cooling.
Preferably, in the step 3), when using dilute sulfuric acid or salt acid for adjusting pH, the second filtrate is heated to boiling
Rise, evaporative crystallization, obtain anhydrous sodium sulfate or sodium chloride.
Preferably, in the step 3), when using dilute sulfuric acid regulation pH, the second filtrate crystallisation by cooling, hydration sulphur is made
Sour sodium.
The method that second filtrate can use evaporative crystallization or crystallisation by cooling, sloughs moisture.From which kind of method with adding
Sour species it is relevant.Dilute sulfuric acid or salt acid for adjusting pH are usually added into, when using hydrochloric acid, because the salt sodium chloride of formation is not
Dissolubility difference very little under synthermal, so sloughing moisture from the method for explosive evaporation crystallization.When using dilute sulfuric acid,
Different products can be obtained under different crystallization conditions, when being crystallized using explosive evaporation, moisture is evaporated to obtain anhydrous sodium sulfate；
When using crystallisation by cooling, such as fast cooling to -6 DEG C of crystallisation by cooling, the crystal now separated out is hydrated sulfuric acid sodium, i.e. saltcake.
The factors such as the use range of the product obtained in view of evaporative crystallization, market sale, usually using sulphur acid for adjusting pH, prepare anhydrous
Sodium sulphate or saltcake.
Second filtrate is crystallized, and yield is relevant with the sour amount added.The waste that crystallization process does not have material is free of it
Its impurity.Without carrying out subsequent treatment again.
Embodiment 1
It is raw material to choose cadmium alkaline residue 1000kg, and cadmium alkaline residue composition contains 1% cadmium, and 20% zinc, remaining is alkaloids.
1) alkaline residue is put into dissolving tank, adds 6 tons of waste water, stirring and dissolving 2h, cadmium alkaline residue are completely dissolved at normal temperatures
Afterwards, the first suspension is obtained.
2) the first suspension is added to press filtration in filter press, obtains the first filter residue (cadmium metal and cadmium oxide precipitation) and the
One filtrate (zincic acid sodium solution, also containing materials such as sodium hydroxide, sodium carbonate).It is sent into reduction furnace and carries out after first residue collection
Reduction melting.First filtrate enters in dissolving tank.First filtrate is adjusted into PH to 7 with dilute sulfuric acid, obtains basic zinc carbonate precipitation
And zinc hydroxide precipitation, form the second suspension.
3) the second suspension is separated with filter press, obtains the second filtrate (metabisulfite solution) and the second filter residue (alkali
Formula zinc carbonate precipitates and zinc hydroxide precipitation), the second filter residue returns to zinc abstraction process, and the second filtrate is evaporated crystallization, obtained
Anhydrous sodium sulfate.
Embodiment 2
It is raw material to choose cadmium alkaline residue 1000kg, and cadmium alkaline residue composition contains 1% cadmium, and 20% zinc, remaining is alkaloids.
1) alkaline residue is put into dissolving tank, adds 5 tons of waste water, stirring and dissolving 1h, cadmium alkaline residue are completely dissolved at normal temperatures
Afterwards, the first suspension is obtained.
2) the first suspension is added to press filtration in filter press, obtains the first filter residue (cadmium metal and cadmium oxide precipitation) and the
One filtrate (zincic acid sodium solution, also containing materials such as sodium hydroxide, sodium carbonate).It is sent into reduction furnace and carries out after first residue collection
Reduction melting.First filtrate enters in dissolving tank.First filtrate is adjusted into PH to 10 with dilute sulfuric acid, obtains basic zinc carbonate precipitation
And zinc hydroxide precipitation, the second suspension is formed, in the case where pH is 6.8-10, sodium hydroxide, sodium carbonate all dissolve, raw
Into basic zinc carbonate precipitation and zinc hydroxide precipitation, then main component is sodium sulphate in solution.
3) the second suspension is separated with filter press, obtains the second filtrate (metabisulfite solution) and the second filter residue (alkali
Formula zinc carbonate precipitates and zinc hydroxide precipitation), the second filter residue returns to zinc abstraction process, and the second filtrate cooled down at -6 DEG C
Crystallization, obtains hydrated sulfuric acid sodium.
Cadmium alkaline residue processing method provided by the invention, technique is simple, and equipment investment is few, and zinc and cadmium can be reclaimed and reclaimed
Rate is high, and sodium sulfate byproduct has good economic value, is a kind of alkaline residue without the pollution of waste water, waste, heavy metal ion
The new technology of processing.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of cadmium alkaline residue processing method, it is characterised in that comprise the following steps：
1) cadmium alkaline residue adds water, dissolving, obtains the first suspension；
2) the first suspension carries out the first filtering, obtains the first filtrate and the first filter residue, and the first filter residue is reduced, and is made thick
Cadmium；First filtrate adds acid for adjusting pH, generation precipitation, obtains the second suspension containing precipitation；
3) the second suspension carries out the second filtering, obtains the second filtrate and the second filter residue, and the second filter residue returns to smelting procedure；Second
Filtrate is crystallized, and sloughs moisture.
2. according to the method for claim 1, it is characterised in that the cadmium alkaline residue is in the thick cadmium process of Spongy Cadmium also original production
Caused cadmium alkaline residue.
3. according to the method for claim 1, it is characterised in that in the step 1), cadmium alkaline residue adds production waste water and carried out
The weight ratio of dissolving, the cadmium alkaline residue and production waste water is 1:4-10.
4. according to the method for claim 1, it is characterised in that in the step 1), the dissolving uses stirring and dissolving, molten
Solve time 0.5-3h.
5. according to the method for claim 1, it is characterised in that it is described first filtering, second filtering using filtering, press filtration,
Filter, any one method in centrifugation.
6. according to the method for claim 1, it is characterised in that in the step 2), the first filtrate adds dilute sulfuric acid or salt
Acid for adjusting pH.
7. according to the method for claim 1, it is characterised in that in the step 2), adjust pH to 6.8-10.
8. according to the method for claim 1, it is characterised in that in the step 3), the second filtrate using evaporative crystallization or
The method of crystallisation by cooling, sloughs moisture.
9. according to the method for claim 8, it is characterised in that in the step 3), adjusted when using dilute sulfuric acid or hydrochloric acid
When saving pH, the second filtrate is heated to boiling, evaporative crystallization, obtains anhydrous sodium sulfate or sodium chloride.
10. according to the method for claim 8, it is characterised in that in the step 3), when using dilute sulfuric acid regulation pH,
Second filtrate crystallisation by cooling, hydrated sulfuric acid sodium is made.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699547A (en) * | 2019-08-23 | 2020-01-17 | 白银有色集团股份有限公司 | Method for recovering zinc and cadmium from waste alkaline residues |
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