CA1061283A - Process for removing copper from copper anode slime - Google Patents
Process for removing copper from copper anode slimeInfo
- Publication number
- CA1061283A CA1061283A CA201,742A CA201742A CA1061283A CA 1061283 A CA1061283 A CA 1061283A CA 201742 A CA201742 A CA 201742A CA 1061283 A CA1061283 A CA 1061283A
- Authority
- CA
- Canada
- Prior art keywords
- copper
- slime
- leached
- sulfuric acid
- ferric ion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- C22B7/04—Working-up slag
-
- 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
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0065—Leaching or slurrying
- C22B15/0067—Leaching or slurrying with acids or salts thereof
- C22B15/0071—Leaching or slurrying with acids or salts thereof containing sulfur
-
- 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
- C22B7/007—Wet processes by acid leaching
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process for removing copper from a copper anode slime resulting from copper electrolysis, which comprises leaching the copper anode slime with a sulfuric acid solution containing ferric ion. Valuable metals contained in the copper anode slime can thereafter be separated individually. The ferrous ion occurring in the resulting copper leached liquor can be regenerated to ferric ion so that after separation of the copper, the leached liquor can be recycled for use as the sulfuric acid solution.
A process for removing copper from a copper anode slime resulting from copper electrolysis, which comprises leaching the copper anode slime with a sulfuric acid solution containing ferric ion. Valuable metals contained in the copper anode slime can thereafter be separated individually. The ferrous ion occurring in the resulting copper leached liquor can be regenerated to ferric ion so that after separation of the copper, the leached liquor can be recycled for use as the sulfuric acid solution.
Description
1061~
: 1 ~ACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to a process for removing a copper component from a copper anode slime formed in copper electrolysis.
,''J 2. Description of the Prior Art . , ; The copper anode slime formed in copper electrolysis contains valuable metals such as gold, silver, selenium and ~ 10 tellurium in addition to copper. These valuable metals cannot '- be recovered effectively from the slime unless the copper compo-nent as a main constituent of the slime is separated and removed in advance.
One conventional method for removing copper from such a slime comprises blowing air into a stirred suspension of the slime in a dilute solution of sulfuric acid while heating the suspension, thereby leaching copper from the slime. ~owever, this method has the defect that about 6 hours are required to leach the copper and the ratio of the copper leached is low. This conventional ` 20 method also has the disadvantage that when the content of selenium in the slime exceeds about 1/3 of the silver content, the removal of copper becomes difficult. This is probably . because the proportion of sparingly soluble compounds, such as Cu2Se, formed increases with increasing selenium content of the slime. On the other hand, since the content of silver, selenium :, ~
and tellurium in the slime is dominated by the composition of j~ copper anode as a raw material used for copper electroIysis, it ;~ can be understood that depending upon the composition of the starting copper anode, the removal of copper from the slime would become difficult in the conventional method for the reason mentioned above.
' ,, . . , . . ' . , . ' l283 `` 1 Conventional techniques proposed so far also include a method comprising roasting the slime and then leachiny copper with dilute sulfuric acia, a method comprising adding sulfuric acid to the slime, roasting it, and then leaching copper with water, and a method comprising maintaining the copper anode slime together with dilute sulfuric acid in an autoclave at a high temperature and a high pressure, to leach the copper. In these methods, the leaching of copper is performed well, and copper can be effectively removed. However, on the other hand, valuable metals such as selenium and silver also come out to some extent during the leaching of the copper, and a complicated procedure is required to separate and recover these valuable metals from the leached liquid.
- SUMMARY OF THE INVENTION
In view of these circumstances, investigations have been made into an advantageous method for removing copper from a slime formed in the copper electrolysis without the various defects of the conventional methods described above resulting, and it has `
been found that by leaching the slime with a sulfuric acid solu-tion containing ferric ion, the copper in the slime can be selectively leached at a high rate within a short period of time.
It is therefore an object of this invention to provide a process for efficiently leaching copper contained in a slime.
Another object of this invention is to provide an advantageous process wherein the leached copper is recovered and removed, and at the same time, the ferric ion used for leaching is regenerated.
- Accordingly, the present invention provides a process for removing copper from a ~ime resulting from copper electrolysis, which comprises leaching the slime with a sulfuric acid solution "' -' . .
l~ilZ~3 . ., ` 1 containing a ferric ion.
According to another aspect of this invention, there is ~: provided a process for removing copper from a slime resulting from copper electrolysis, which comprises leaching the slime with a sulfuric acid solution containiny ferric ion, separating the leached substance by filtration, subjecting the resulting copper leached liquid to electrowinning using-insoluble anodes to recover the copper, and at the same time, regenerating the ferrous ion in the copper leached liquid as a ferric ion.
DETAILED DESCRIPTION OF THE INVENTION
The slime resulting in copper electrolysis contains valuable metals such as gold, silver, selenium and tellurium.
- In order to recover these metals separately, the copper content o~ the slime must be reduced to not more than 1.0%, preferably not more than 0.5%, by weight. In other words, if copper is removed from the slime to a copper content of not more than 1.0%, valuable metals other than copper in the slime can be recovered without difficulties.
The sulfuric acid solution containing ferric ion can be prepared, for example, by dissolving an iron salt compound con-taining ferric ion, such as ferric sulfate, in sulfuric acid.
While not critical, the concentration of sulfuric acid in the solution at the beginning of the leaching can range from about 50 to 300 g/~, as free sulfuric acid, and the ferric ion con-centration of this solution can range from about 1 to 50 g/~ -- these ranges can easily be varied by one skilled in the art to achieve the desired ~esults.
The removal of copper from the slime using a sulfuric acid solution containing ferric ion can be accomplished by con-tacting the slime with the above sulfuric acid solution to leach ;
, .
:. . :, , . . .~: . ;. , ,,. : . , . .:, ..
~ILO~ 3 1 the copper from the slime. For example, the contacting can be accomplished by stirring the solution, by bubbling air through the `i system, etc. or by use of a combination of methods. Suitable temperatures can range from ambient temperature, e.g., about 20 to 30C, to about 100C.
, In order to achieve the desired object, the amount of the ferric ion contained in the su:Lfuric acid solution should be ~ at least about 0.3 equivalents, e.g., 0.3 to about 5 equivalents, ; preferably 0.5 to 1.5 equivalents, based on the amount of 1~ copper in the slime. The time required for the leaching of the copper from the slime can vary according to the sulfuric acid concentration and the ferric ion content of the sulfuric acid solution and the amounts of copper, selenium and tellurium in the slime. A suitable leaching time can range from about 0.5 to 8 hours, preferably 1 to 3 hours. Generally, a substantial amount of copper can be leached with a lèaching time of about 2 hours.
After leaching the copper from the slime in the manner described above, the resulting leached liquor is passed through ,~
a thickner or a filter to separate any insoluble matter, whereupon copper is removed from the slime as the leached liquor.
It has been experimentally determined that by the process of the present invention, about 99~ of copper in the slime is leached, and on the other hand, no substantial leaching of metals other than copper, such as silver, selenium and tellurium is `
observed.
The present invention also includes as an embodiment a process which comprises subjecting the leached liquor containing the copper separated in the manner described above and ferrous ion (in the above leaching treatment, the ferric ion in the ilZ83 1 sulfuric acid solution is reduced to ferrous ion) to electro-winning using an insoluble anode to recover the copper and regenerating the ferrous ion in the leached liquor to ferric ion.
In this electrowinning process a carbon or lead plate is used as an anode and a copper or stainless steel plate is used as a cathode. A suitable anode and cathode current density can range from about 30 to 500, preferably 30 to 200, A/m .
Suitable solution concentrations which can be used can range from about 10 to 50 g/liter for copper, 0 to 50 g/liter for ferric ion 0 and a sulfuric acid concentration of about 50 to 300 g/liter.
This electrowinning electrolysis results in the electrolytic deposition of copper in the leached liquor, and simultaneously results in the oxidation of the ferrous ion in the leached liquor to ferric ion. Accordingly, the solution obtained after separating the deposited copper can be recycled for use as the sulfuric acid solution for leaching copper from the slime after adjusting the ferric ion content.
The valuable metals other than copper are then recovered from the slime from which the copper has been removed.
According to the present invention, it is possible to -leach copper selectively from the slime without leaching other valuable metals contained in the slime, and the copper content of the copper anode slime remaining after separation of copper by leaching can be reduced to less than 1%. Therefore, the present invention has the advantage that a separate recovery of valuable metals such as silver, selenium or tellurium in the slime can be performed easily. Furthermore, in the present in-vention, it is possi~le to recover copper advantageously from the -copper leached liquor, and to convert the ferrous ion formed in the leached liquor to ferric ion. Accordingly, the invention has - 5 - ;~
. ~0~i~283 1 the advantage that by adjusting the ~erric ion content of the leached liquor containing ferric ion after regeneration tthat is ; to say, adding ferric ion so that the ferric ion content becomes at least about 0.3 equivalents based on the copper in the slime ~` from which the copper is to be removed), this regenerated solution : .
can be recycled and used as the sulfuric acid solution for removing the copper from the slime. Furthermore, the process of this invention is commercially advantageous because a drastic shortening of the time required to leach copper from the slime results as 1~ compared with the conventional process. -The present invention provides a very efficient removal : of copper from the slime occurring in copper electrolysis and permits valuable metals from the slime from which copper has been removed to be recovered easily. Accordingly, the process of ; this invention is considered to be very beneficial for copper electrolysis.
In addition, it has been ascertained as a result of these investigations that the leaching of copper from the slime can also be performed using a sulfuric acid solution containing a hexavalent chromium ion instead of the sulfuric acid solution ~ ontaining a ferric ion.
- The following Examples and Comparative Examples are ` given to illustrate the present invention more specifically and in greater detail. Unless otherwise indicated, all parts, percents, ratios and the like are by weight.
. ;. ~ 10~ Kg of a copper anode slime containing 27.6% of copper, 7.1% of silver, 13.8% of selenium and 1.7% of tellurium formed in a copper electrolysis was continuously leached for 2 hours with a sulfuric aicd solution containing 20 g/liter of ferric ; . .
~0~ 83 1 ion and 150 g/liter of sulfuric acid ~prepared by dissolving 95.5 Kg of commercial grade ferric sulfate in l m of sulfuric acid) at a temperature of 90C while bubbling air thereinto and using mechanical stirring and a pulp concentration of 50 g/liter.
Then, the mixture was passed through a filter for separation into the leached liquor and insoluble substances.
The leached ~uor so obtained contained 13.7 ~/liter of copper and 20 g/liter of iron, and traces of silver, selenium and tellurium. On the other hand, 63 Kg of insoluble matter containing 22.0% of selenium and 2.7% of tellurium was obtained.
It will therefore be appreciated that the rate of copper leached from the slime reached 99.2%, and silver selenium and tellurium were not substantially dissolved. ~ i For comparison, copper was removed from the slime in accordance with conventional methods, and the results obtained are shown in the following Comparative Examples.
300 Kg of the same slime as used in Example l was leached for 6 hours with a sulfuric acid solution containing 150 g/liter of sulfuric acid while bubbling air into the mixture ;
and using mechanical stirring and a pulp concentration of 100 g/
liter.
The leached liquor was filtered to obtain 247 Kg of insoIuble matter which contained 23.9% of copper. It will thus be appreciated that the rate of copper leached from the slime was only 28.7~.
50 g of the same slime as used in Example 1 was leached -under pressure at a temperature of 90C using an autoclave with ; . . . ~ ,, .. . - . . :
- ~0~1283 1 an oxygen partial pressure of 20 Kg/cm2 and a sulfuric acid con-- centration of 200 g/liter. The leached product was filtered to ; form 15.7 g of insoluble matter containing 0.4~% of copper. On the other hand, the leached liquor contained less than 0.1~ of silver, 1% of selenium and 51.1~ of tellurium. ,-~
It will be appreciated from this Comparative Example that the rate of copper leached from the slime reached 99.5%, but a considerable amount of tellurium was leached out at the same time.
~ his Example shows the recovery of copper from the copper leached liquor and the regeneration of ferrous ion in the leached liquor to ferric ion.
The leached liquor obtained in Example 1 was electro-lyzed using a lead plate as an anode and a copper plate as a cathode to recover a greater portion of the copper in the leached liquor. The leached liquor after recovery of the copper ~ contained 20 g/liter of a ferric ion.
; While the invention has been described in detail and ;' 20 with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. ~-:: ' ; 30 '.
. ~
: 1 ~ACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to a process for removing a copper component from a copper anode slime formed in copper electrolysis.
,''J 2. Description of the Prior Art . , ; The copper anode slime formed in copper electrolysis contains valuable metals such as gold, silver, selenium and ~ 10 tellurium in addition to copper. These valuable metals cannot '- be recovered effectively from the slime unless the copper compo-nent as a main constituent of the slime is separated and removed in advance.
One conventional method for removing copper from such a slime comprises blowing air into a stirred suspension of the slime in a dilute solution of sulfuric acid while heating the suspension, thereby leaching copper from the slime. ~owever, this method has the defect that about 6 hours are required to leach the copper and the ratio of the copper leached is low. This conventional ` 20 method also has the disadvantage that when the content of selenium in the slime exceeds about 1/3 of the silver content, the removal of copper becomes difficult. This is probably . because the proportion of sparingly soluble compounds, such as Cu2Se, formed increases with increasing selenium content of the slime. On the other hand, since the content of silver, selenium :, ~
and tellurium in the slime is dominated by the composition of j~ copper anode as a raw material used for copper electroIysis, it ;~ can be understood that depending upon the composition of the starting copper anode, the removal of copper from the slime would become difficult in the conventional method for the reason mentioned above.
' ,, . . , . . ' . , . ' l283 `` 1 Conventional techniques proposed so far also include a method comprising roasting the slime and then leachiny copper with dilute sulfuric acia, a method comprising adding sulfuric acid to the slime, roasting it, and then leaching copper with water, and a method comprising maintaining the copper anode slime together with dilute sulfuric acid in an autoclave at a high temperature and a high pressure, to leach the copper. In these methods, the leaching of copper is performed well, and copper can be effectively removed. However, on the other hand, valuable metals such as selenium and silver also come out to some extent during the leaching of the copper, and a complicated procedure is required to separate and recover these valuable metals from the leached liquid.
- SUMMARY OF THE INVENTION
In view of these circumstances, investigations have been made into an advantageous method for removing copper from a slime formed in the copper electrolysis without the various defects of the conventional methods described above resulting, and it has `
been found that by leaching the slime with a sulfuric acid solu-tion containing ferric ion, the copper in the slime can be selectively leached at a high rate within a short period of time.
It is therefore an object of this invention to provide a process for efficiently leaching copper contained in a slime.
Another object of this invention is to provide an advantageous process wherein the leached copper is recovered and removed, and at the same time, the ferric ion used for leaching is regenerated.
- Accordingly, the present invention provides a process for removing copper from a ~ime resulting from copper electrolysis, which comprises leaching the slime with a sulfuric acid solution "' -' . .
l~ilZ~3 . ., ` 1 containing a ferric ion.
According to another aspect of this invention, there is ~: provided a process for removing copper from a slime resulting from copper electrolysis, which comprises leaching the slime with a sulfuric acid solution containiny ferric ion, separating the leached substance by filtration, subjecting the resulting copper leached liquid to electrowinning using-insoluble anodes to recover the copper, and at the same time, regenerating the ferrous ion in the copper leached liquid as a ferric ion.
DETAILED DESCRIPTION OF THE INVENTION
The slime resulting in copper electrolysis contains valuable metals such as gold, silver, selenium and tellurium.
- In order to recover these metals separately, the copper content o~ the slime must be reduced to not more than 1.0%, preferably not more than 0.5%, by weight. In other words, if copper is removed from the slime to a copper content of not more than 1.0%, valuable metals other than copper in the slime can be recovered without difficulties.
The sulfuric acid solution containing ferric ion can be prepared, for example, by dissolving an iron salt compound con-taining ferric ion, such as ferric sulfate, in sulfuric acid.
While not critical, the concentration of sulfuric acid in the solution at the beginning of the leaching can range from about 50 to 300 g/~, as free sulfuric acid, and the ferric ion con-centration of this solution can range from about 1 to 50 g/~ -- these ranges can easily be varied by one skilled in the art to achieve the desired ~esults.
The removal of copper from the slime using a sulfuric acid solution containing ferric ion can be accomplished by con-tacting the slime with the above sulfuric acid solution to leach ;
, .
:. . :, , . . .~: . ;. , ,,. : . , . .:, ..
~ILO~ 3 1 the copper from the slime. For example, the contacting can be accomplished by stirring the solution, by bubbling air through the `i system, etc. or by use of a combination of methods. Suitable temperatures can range from ambient temperature, e.g., about 20 to 30C, to about 100C.
, In order to achieve the desired object, the amount of the ferric ion contained in the su:Lfuric acid solution should be ~ at least about 0.3 equivalents, e.g., 0.3 to about 5 equivalents, ; preferably 0.5 to 1.5 equivalents, based on the amount of 1~ copper in the slime. The time required for the leaching of the copper from the slime can vary according to the sulfuric acid concentration and the ferric ion content of the sulfuric acid solution and the amounts of copper, selenium and tellurium in the slime. A suitable leaching time can range from about 0.5 to 8 hours, preferably 1 to 3 hours. Generally, a substantial amount of copper can be leached with a lèaching time of about 2 hours.
After leaching the copper from the slime in the manner described above, the resulting leached liquor is passed through ,~
a thickner or a filter to separate any insoluble matter, whereupon copper is removed from the slime as the leached liquor.
It has been experimentally determined that by the process of the present invention, about 99~ of copper in the slime is leached, and on the other hand, no substantial leaching of metals other than copper, such as silver, selenium and tellurium is `
observed.
The present invention also includes as an embodiment a process which comprises subjecting the leached liquor containing the copper separated in the manner described above and ferrous ion (in the above leaching treatment, the ferric ion in the ilZ83 1 sulfuric acid solution is reduced to ferrous ion) to electro-winning using an insoluble anode to recover the copper and regenerating the ferrous ion in the leached liquor to ferric ion.
In this electrowinning process a carbon or lead plate is used as an anode and a copper or stainless steel plate is used as a cathode. A suitable anode and cathode current density can range from about 30 to 500, preferably 30 to 200, A/m .
Suitable solution concentrations which can be used can range from about 10 to 50 g/liter for copper, 0 to 50 g/liter for ferric ion 0 and a sulfuric acid concentration of about 50 to 300 g/liter.
This electrowinning electrolysis results in the electrolytic deposition of copper in the leached liquor, and simultaneously results in the oxidation of the ferrous ion in the leached liquor to ferric ion. Accordingly, the solution obtained after separating the deposited copper can be recycled for use as the sulfuric acid solution for leaching copper from the slime after adjusting the ferric ion content.
The valuable metals other than copper are then recovered from the slime from which the copper has been removed.
According to the present invention, it is possible to -leach copper selectively from the slime without leaching other valuable metals contained in the slime, and the copper content of the copper anode slime remaining after separation of copper by leaching can be reduced to less than 1%. Therefore, the present invention has the advantage that a separate recovery of valuable metals such as silver, selenium or tellurium in the slime can be performed easily. Furthermore, in the present in-vention, it is possi~le to recover copper advantageously from the -copper leached liquor, and to convert the ferrous ion formed in the leached liquor to ferric ion. Accordingly, the invention has - 5 - ;~
. ~0~i~283 1 the advantage that by adjusting the ~erric ion content of the leached liquor containing ferric ion after regeneration tthat is ; to say, adding ferric ion so that the ferric ion content becomes at least about 0.3 equivalents based on the copper in the slime ~` from which the copper is to be removed), this regenerated solution : .
can be recycled and used as the sulfuric acid solution for removing the copper from the slime. Furthermore, the process of this invention is commercially advantageous because a drastic shortening of the time required to leach copper from the slime results as 1~ compared with the conventional process. -The present invention provides a very efficient removal : of copper from the slime occurring in copper electrolysis and permits valuable metals from the slime from which copper has been removed to be recovered easily. Accordingly, the process of ; this invention is considered to be very beneficial for copper electrolysis.
In addition, it has been ascertained as a result of these investigations that the leaching of copper from the slime can also be performed using a sulfuric acid solution containing a hexavalent chromium ion instead of the sulfuric acid solution ~ ontaining a ferric ion.
- The following Examples and Comparative Examples are ` given to illustrate the present invention more specifically and in greater detail. Unless otherwise indicated, all parts, percents, ratios and the like are by weight.
. ;. ~ 10~ Kg of a copper anode slime containing 27.6% of copper, 7.1% of silver, 13.8% of selenium and 1.7% of tellurium formed in a copper electrolysis was continuously leached for 2 hours with a sulfuric aicd solution containing 20 g/liter of ferric ; . .
~0~ 83 1 ion and 150 g/liter of sulfuric acid ~prepared by dissolving 95.5 Kg of commercial grade ferric sulfate in l m of sulfuric acid) at a temperature of 90C while bubbling air thereinto and using mechanical stirring and a pulp concentration of 50 g/liter.
Then, the mixture was passed through a filter for separation into the leached liquor and insoluble substances.
The leached ~uor so obtained contained 13.7 ~/liter of copper and 20 g/liter of iron, and traces of silver, selenium and tellurium. On the other hand, 63 Kg of insoluble matter containing 22.0% of selenium and 2.7% of tellurium was obtained.
It will therefore be appreciated that the rate of copper leached from the slime reached 99.2%, and silver selenium and tellurium were not substantially dissolved. ~ i For comparison, copper was removed from the slime in accordance with conventional methods, and the results obtained are shown in the following Comparative Examples.
300 Kg of the same slime as used in Example l was leached for 6 hours with a sulfuric acid solution containing 150 g/liter of sulfuric acid while bubbling air into the mixture ;
and using mechanical stirring and a pulp concentration of 100 g/
liter.
The leached liquor was filtered to obtain 247 Kg of insoIuble matter which contained 23.9% of copper. It will thus be appreciated that the rate of copper leached from the slime was only 28.7~.
50 g of the same slime as used in Example 1 was leached -under pressure at a temperature of 90C using an autoclave with ; . . . ~ ,, .. . - . . :
- ~0~1283 1 an oxygen partial pressure of 20 Kg/cm2 and a sulfuric acid con-- centration of 200 g/liter. The leached product was filtered to ; form 15.7 g of insoluble matter containing 0.4~% of copper. On the other hand, the leached liquor contained less than 0.1~ of silver, 1% of selenium and 51.1~ of tellurium. ,-~
It will be appreciated from this Comparative Example that the rate of copper leached from the slime reached 99.5%, but a considerable amount of tellurium was leached out at the same time.
~ his Example shows the recovery of copper from the copper leached liquor and the regeneration of ferrous ion in the leached liquor to ferric ion.
The leached liquor obtained in Example 1 was electro-lyzed using a lead plate as an anode and a copper plate as a cathode to recover a greater portion of the copper in the leached liquor. The leached liquor after recovery of the copper ~ contained 20 g/liter of a ferric ion.
; While the invention has been described in detail and ;' 20 with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. ~-:: ' ; 30 '.
. ~
Claims (2)
1. A process for removing copper from a copper anode slime resulting from copper electrolysis which comprises leaching the slime with a sulphuric acid solution containing ferric ion, wherein the amount of the ferric ion in the sulphuric acid solution is at least about 0.3 equivalents per equivalent of copper in the slime, separating the leached substance by filtration, and subjecting the resulting copper leached liquor to electrowinning to recover the copper, thereby simultaneously reconverting ferrous ion in the copper leached liquor as produced in the leaching to ferric ion.
2. The process of claim 1 wherein the leaching is carried out for about 0.5 to 8 hours.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6476173A JPS5328851B2 (en) | 1973-06-11 | 1973-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1061283A true CA1061283A (en) | 1979-08-28 |
Family
ID=13267473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA201,742A Expired CA1061283A (en) | 1973-06-11 | 1974-06-05 | Process for removing copper from copper anode slime |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5328851B2 (en) |
| CA (1) | CA1061283A (en) |
| DE (1) | DE2428129A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944388A (en) * | 2015-06-08 | 2015-09-30 | 东北大学 | Method for recovering selenium in copper anode slime through normal-pressure nitric-sulfuric mixed acid leaching |
| CN114735659A (en) * | 2022-03-10 | 2022-07-12 | 金川集团股份有限公司 | Method for recovering tellurium from copper anode slime low-temperature pressurized leaching liquid |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572772B2 (en) * | 1975-01-30 | 1982-01-18 | ||
| JPS5260296A (en) * | 1975-11-13 | 1977-05-18 | Nippon Mining Co Ltd | Method for electrolytic oxidation of ferrous iron |
| JP6604466B2 (en) * | 2015-03-25 | 2019-11-13 | 住友電気工業株式会社 | Copper manufacturing method and copper manufacturing apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2031299A (en) * | 1934-01-31 | 1936-02-18 | American Smelting Refining | Treating copper anode mud |
| BE795422A (en) * | 1972-02-18 | 1973-08-14 | Inspiration Cons Copper | EXTRACTION OF COPPER FROM CUPRIFFLE MATERIALS |
-
1973
- 1973-06-11 JP JP6476173A patent/JPS5328851B2/ja not_active Expired
-
1974
- 1974-06-05 CA CA201,742A patent/CA1061283A/en not_active Expired
- 1974-06-11 DE DE19742428129 patent/DE2428129A1/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944388A (en) * | 2015-06-08 | 2015-09-30 | 东北大学 | Method for recovering selenium in copper anode slime through normal-pressure nitric-sulfuric mixed acid leaching |
| CN114735659A (en) * | 2022-03-10 | 2022-07-12 | 金川集团股份有限公司 | Method for recovering tellurium from copper anode slime low-temperature pressurized leaching liquid |
| CN114735659B (en) * | 2022-03-10 | 2023-09-22 | 金川集团股份有限公司 | Method for recovering tellurium from low-temperature pressurized leaching solution of copper anode slime |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5013217A (en) | 1975-02-12 |
| DE2428129A1 (en) | 1974-12-19 |
| JPS5328851B2 (en) | 1978-08-17 |
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