CA1245461A - Precipitation of iron from sulphate solutions - Google Patents
Precipitation of iron from sulphate solutionsInfo
- Publication number
- CA1245461A CA1245461A CA000497084A CA497084A CA1245461A CA 1245461 A CA1245461 A CA 1245461A CA 000497084 A CA000497084 A CA 000497084A CA 497084 A CA497084 A CA 497084A CA 1245461 A CA1245461 A CA 1245461A
- Authority
- CA
- Canada
- Prior art keywords
- sulphate
- solution
- zinc
- ferrous
- iron
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 21
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims description 12
- 229910021653 sulphate ion Inorganic materials 0.000 title claims description 12
- 238000001556 precipitation Methods 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 22
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 22
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 17
- 239000011701 zinc Substances 0.000 claims abstract description 17
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000011686 zinc sulphate Substances 0.000 claims abstract description 13
- 235000009529 zinc sulphate Nutrition 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 238000002386 leaching Methods 0.000 claims description 5
- 239000005083 Zinc sulfide Substances 0.000 claims description 4
- 235000011149 sulphuric acid Nutrition 0.000 claims description 4
- 239000001117 sulphuric acid Substances 0.000 claims description 4
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 4
- 238000009291 froth flotation Methods 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 12
- 229910052595 hematite Inorganic materials 0.000 description 6
- 239000011019 hematite Substances 0.000 description 6
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 6
- 229910001448 ferrous ion Inorganic materials 0.000 description 5
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 4
- 235000008504 concentrate Nutrition 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229910001447 ferric ion Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052935 jarosite Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910052598 goethite Inorganic materials 0.000 description 2
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910001308 Zinc ferrite Inorganic materials 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- WGEATSXPYVGFCC-UHFFFAOYSA-N zinc ferrite Chemical compound O=[Zn].O=[Fe]O[Fe]=O WGEATSXPYVGFCC-UHFFFAOYSA-N 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Iron (AREA)
Abstract
A B S T R A C T
A method for the precipitation of iron from a solution containing ferrous sulphate and zinc sulphate, such as a solution produced during the recovery of zinc from a zinc containing ore, consists of heating the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes. The short residence time of the solution in the pressure vessel means that a pressure vessel with a smaller capacity may be used compared with the pressure vessel required in conventional processes.
A method for the precipitation of iron from a solution containing ferrous sulphate and zinc sulphate, such as a solution produced during the recovery of zinc from a zinc containing ore, consists of heating the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes. The short residence time of the solution in the pressure vessel means that a pressure vessel with a smaller capacity may be used compared with the pressure vessel required in conventional processes.
Description
BACKGROUND OF THE INVENTION
This invention relates to the precipitation of iron from sulphate -~ solutions.
There exist various methods for the precip.itation of iron from S sulphate solutions. These methods have essentially been developed for the separation of iron from zinc sulphate solutions. Zinc sulphate solutions are produced in the sulphuric aci.d leaching of zinc calcines.
One of these prior art processes is known as the jarosite process 10 which makes use of sodium, potassium or ammonium ions for the precipitation of iron in the form of a jarosite precipitate.
Another process, developed by Outokumpu Oy involves the hot acid leaching of zinc ferrite and the simultaneous precipita-tion of the dissolved iron values in the form of a jarosite precipitate.
, . , , , , , . ~ . ~ .. , ., ~
- ;~
The goethite procs~ss for precipitating iron from sulphate solutions involvs~s reducing the ferric (Fe3 +) ions present in such solutions to ferrous (Fe ~) ions and then oxidising the ferrous ions at a controlled pH value with calcine to form a goethite precipitate.
5 Yet a further process is ds~scribed in South African Patent No. 75/2737 and involves precipita~ing the ferric iron with calcine at a controlled pH value.
The hematite process is used commercially in some countries and involves reducing the ferric ions in a ferric sulphate solution to 10 ferrous ions, and oxidising the ferrous ions to ferric ions under the influence of heat and oxygen in an autoclave to cause their precipitation as hematite.
SUMMARY OF THE INVENTION
.
~ The present invention involves a development of the hematite process 15 described above. The hematite process as presently practised requires a long residence time in the autoclave. This means that autoclaves of very large capacity have to be used to ensure that the daily throughput is sufficient for the process to be economically viable. It has been found that very much shorter residence times may 20 be employed. Thus, the invention provides a method of precipitating iron from a ferrous sulphate solution including the step of heating the ferrous sulphate solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110C for a period of time not exceeding 30 minutes.
25 According to another aspect of the invention, in a process for the recovery of zinc from an ore containing zinc values and iron values comprising the steps of grinding the ore, subjecting the ground ore , .. ....
3L~4S~
to a froth flotation step to produce a zinc concentrate, ca]cining the zinc concen-trate to convert the zinc sulphide to zinc oxide, leaching the calcine with sulphuric acid to produce a leach solution comprising zinc sulphate and ferric sulphate, the improvement 5 comprises reducing the ferric sulphate to ferrous sulphate to produce a solution comprising zinc sulphate and ferrous sulphate and heatir.g the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110C for a period of time not exceeding 30 minutes to precipitate out the iron from the solution.
The fact that the residence time of the solution in the pressure vessel does not exceed 30 minutes means that pressure vessels of much smaller capacity than those used previously may be used. In particular, it has been found that pressure vessels with capacities 15 of 15 cubic metres or less may be used without reducing in any way the daily throughput of a conventional hematite process. Preferably, - the period of time during which the ferrous sulphate solution is heated in the presence of oxygen does not exceed 10 minutes.
The process will generally be carried out on a continuous basis with 20 a continuous supply of ferrous sulphate solution being introduced into the pressure vesse] and the treated solution being continuously withdrawn therefrom. As mentioned above, the residence time of the ferrous sulphate solution in the pressure vessel will not exceed 30 minutes.
25 The iron in the sulphate solution which is introduced into the pressure vessel will be in the form of ferrous ions. Such solutions will typically be produced in a zinc recovery process. In zinc recovery processes, the ore containing zinc values and iron values is first ground and a zinc concentrate produced by froth flotation.
.. . . . ... . . . .... . ... . .....
5 ~2~5~i1 The concentrate is calcined to convert the zinc sulphide to zinc oxide and this calcine then treated with a sulphuric acid leach. To ensure adequate leaching of the zinc values, a relatively severe leach, i.e. one containing at least 100 gms per litre of su]phuric 5 acid and an elevated temperature, will be used. Under these conditions, considerable quantities of iron report in the leach solution. The iron in this leach solution will be in the form of ferric ions and these ions should first be reduced to ferrous ions to produce a solution more suitable for the practice of the present 10 invention. Reduction is -typically achieved by treatment of the ferric sulphate solution with zinc sulphide.
As mentioned above, the temperature at which oxidation of the ferrous sulphate leach solution takes place to cause precipitation of the iron must be at least 110C. Normally, a temperature of about 180C
15 wil] be employed.
The iron precipitates in the form of an easily separable hematite (Fe203) which may be removed from the solution using known separation techniques.
It has been determined experimentally that the time taken for the 20 ferrous iron content of a solution to be reduced to a lower value follows the following equation:
t = a - c k ac wherein: a = (Fe++) at t = 0 c = (Fe++) at time t, in minutes k = constant at various temperatures (Fe++~ = Ferrous iron concentration.
~L~4~
Thus, with this formula it is possib]e to determine the residence time required for any particular set of circumstances. Knowing the residence time enables one to de-termine the capacity of the pressure vessel required.
5 The k values at different temperatures have been determined for pure ferrous su]phate solutions and ferrous sulphate solutions containing other dissolved sulphates. These k values for various temperatures are given in Table I below and were determined at constant agitation rates and constant pressures.
TABLE
k Values for Various Temperatures .
_ I
k for FeS04 Solution k for pure Also Containing MgS04 Temperature C FeS0~ Solution MnS0~ and ZnS04 e g- min~1 e g~ min~1 140 0,04 0,20 150 0,06 0,35 160 o,o8 0,58 170 0,11 o,96 180 0,1j 1,53 190 0,20 2,40 200 0,26 3,70 I _ _ , . :Jl . .
This invention relates to the precipitation of iron from sulphate -~ solutions.
There exist various methods for the precip.itation of iron from S sulphate solutions. These methods have essentially been developed for the separation of iron from zinc sulphate solutions. Zinc sulphate solutions are produced in the sulphuric aci.d leaching of zinc calcines.
One of these prior art processes is known as the jarosite process 10 which makes use of sodium, potassium or ammonium ions for the precipitation of iron in the form of a jarosite precipitate.
Another process, developed by Outokumpu Oy involves the hot acid leaching of zinc ferrite and the simultaneous precipita-tion of the dissolved iron values in the form of a jarosite precipitate.
, . , , , , , . ~ . ~ .. , ., ~
- ;~
The goethite procs~ss for precipitating iron from sulphate solutions involvs~s reducing the ferric (Fe3 +) ions present in such solutions to ferrous (Fe ~) ions and then oxidising the ferrous ions at a controlled pH value with calcine to form a goethite precipitate.
5 Yet a further process is ds~scribed in South African Patent No. 75/2737 and involves precipita~ing the ferric iron with calcine at a controlled pH value.
The hematite process is used commercially in some countries and involves reducing the ferric ions in a ferric sulphate solution to 10 ferrous ions, and oxidising the ferrous ions to ferric ions under the influence of heat and oxygen in an autoclave to cause their precipitation as hematite.
SUMMARY OF THE INVENTION
.
~ The present invention involves a development of the hematite process 15 described above. The hematite process as presently practised requires a long residence time in the autoclave. This means that autoclaves of very large capacity have to be used to ensure that the daily throughput is sufficient for the process to be economically viable. It has been found that very much shorter residence times may 20 be employed. Thus, the invention provides a method of precipitating iron from a ferrous sulphate solution including the step of heating the ferrous sulphate solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110C for a period of time not exceeding 30 minutes.
25 According to another aspect of the invention, in a process for the recovery of zinc from an ore containing zinc values and iron values comprising the steps of grinding the ore, subjecting the ground ore , .. ....
3L~4S~
to a froth flotation step to produce a zinc concentrate, ca]cining the zinc concen-trate to convert the zinc sulphide to zinc oxide, leaching the calcine with sulphuric acid to produce a leach solution comprising zinc sulphate and ferric sulphate, the improvement 5 comprises reducing the ferric sulphate to ferrous sulphate to produce a solution comprising zinc sulphate and ferrous sulphate and heatir.g the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110C for a period of time not exceeding 30 minutes to precipitate out the iron from the solution.
The fact that the residence time of the solution in the pressure vessel does not exceed 30 minutes means that pressure vessels of much smaller capacity than those used previously may be used. In particular, it has been found that pressure vessels with capacities 15 of 15 cubic metres or less may be used without reducing in any way the daily throughput of a conventional hematite process. Preferably, - the period of time during which the ferrous sulphate solution is heated in the presence of oxygen does not exceed 10 minutes.
The process will generally be carried out on a continuous basis with 20 a continuous supply of ferrous sulphate solution being introduced into the pressure vesse] and the treated solution being continuously withdrawn therefrom. As mentioned above, the residence time of the ferrous sulphate solution in the pressure vessel will not exceed 30 minutes.
25 The iron in the sulphate solution which is introduced into the pressure vessel will be in the form of ferrous ions. Such solutions will typically be produced in a zinc recovery process. In zinc recovery processes, the ore containing zinc values and iron values is first ground and a zinc concentrate produced by froth flotation.
.. . . . ... . . . .... . ... . .....
5 ~2~5~i1 The concentrate is calcined to convert the zinc sulphide to zinc oxide and this calcine then treated with a sulphuric acid leach. To ensure adequate leaching of the zinc values, a relatively severe leach, i.e. one containing at least 100 gms per litre of su]phuric 5 acid and an elevated temperature, will be used. Under these conditions, considerable quantities of iron report in the leach solution. The iron in this leach solution will be in the form of ferric ions and these ions should first be reduced to ferrous ions to produce a solution more suitable for the practice of the present 10 invention. Reduction is -typically achieved by treatment of the ferric sulphate solution with zinc sulphide.
As mentioned above, the temperature at which oxidation of the ferrous sulphate leach solution takes place to cause precipitation of the iron must be at least 110C. Normally, a temperature of about 180C
15 wil] be employed.
The iron precipitates in the form of an easily separable hematite (Fe203) which may be removed from the solution using known separation techniques.
It has been determined experimentally that the time taken for the 20 ferrous iron content of a solution to be reduced to a lower value follows the following equation:
t = a - c k ac wherein: a = (Fe++) at t = 0 c = (Fe++) at time t, in minutes k = constant at various temperatures (Fe++~ = Ferrous iron concentration.
~L~4~
Thus, with this formula it is possib]e to determine the residence time required for any particular set of circumstances. Knowing the residence time enables one to de-termine the capacity of the pressure vessel required.
5 The k values at different temperatures have been determined for pure ferrous su]phate solutions and ferrous sulphate solutions containing other dissolved sulphates. These k values for various temperatures are given in Table I below and were determined at constant agitation rates and constant pressures.
TABLE
k Values for Various Temperatures .
_ I
k for FeS04 Solution k for pure Also Containing MgS04 Temperature C FeS0~ Solution MnS0~ and ZnS04 e g- min~1 e g~ min~1 140 0,04 0,20 150 0,06 0,35 160 o,o8 0,58 170 0,11 o,96 180 0,1j 1,53 190 0,20 2,40 200 0,26 3,70 I _ _ , . :Jl . .
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1.
A method of precipitating iron from a ferrous sulphate solution includes the step of heating the ferrous sulphate solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes.
2.
A method according to claim 1 wherein the ferrous sulphate solution is heated at a temperature in excess of 110°C for a period of time not exceeding 10 minutes.
3.
A method according to claim 1 or claim 2 wherein the ferrous sulphate solution is heated at a temperature in excess of 180°C.
4.
A method according to claim 1 wherein the ferrous sulphate solution is continuously introduced into and continuously withdrawn from the pressure vessel.
5.
A method according to claim 1 wherein the ferrous sulphate solution comprises a solution comprising ferrous sulphate and zinc sulphate.
6.
A method according to claim 5 wherein the solution comprising ferrous sulphate and zinc sulphate is produced by reducing a solution comprising ferric sulphate and zinc sulphate.
7.
A method according to claim 6 wherein the solution comprising ferric sulphate and zinc sulphate results from a sulphuric acid leach of a calcine containing zinc values and iron values.
8.
In a process for the recovery of zinc from an ore containing zinc values and iron values comprising the steps of grinding the ore, subjecting the ground ore to a froth flotation step to produce a zinc concentrate, calcining the zinc concentrate to convert the zinc sulphide to zinc oxide, leaching the calcine with sulphuric acid to produce a leach solution comprising zinc sulphate and ferric sulphate, the improvement which comprises reducing the ferric sulphate to ferrous sulphate to produce a solution comprising zinc sulphate and ferrous sulphate and heating the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes to precipitate out the iron from the solution.
9.
A process according to claim 8 wherein the solution comprising zinc sulphate and ferrous sulphate is heated at a temperature in excess of 110°C for a period of time not exceeding 10 minutes.
10 .
A process according to claim 8 or claim 9 wherein the solution comprising zinc sulphate and ferrous sulphate is heated at a temperature in excess of 180°C.
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1.
A method of precipitating iron from a ferrous sulphate solution includes the step of heating the ferrous sulphate solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes.
2.
A method according to claim 1 wherein the ferrous sulphate solution is heated at a temperature in excess of 110°C for a period of time not exceeding 10 minutes.
3.
A method according to claim 1 or claim 2 wherein the ferrous sulphate solution is heated at a temperature in excess of 180°C.
4.
A method according to claim 1 wherein the ferrous sulphate solution is continuously introduced into and continuously withdrawn from the pressure vessel.
5.
A method according to claim 1 wherein the ferrous sulphate solution comprises a solution comprising ferrous sulphate and zinc sulphate.
6.
A method according to claim 5 wherein the solution comprising ferrous sulphate and zinc sulphate is produced by reducing a solution comprising ferric sulphate and zinc sulphate.
7.
A method according to claim 6 wherein the solution comprising ferric sulphate and zinc sulphate results from a sulphuric acid leach of a calcine containing zinc values and iron values.
8.
In a process for the recovery of zinc from an ore containing zinc values and iron values comprising the steps of grinding the ore, subjecting the ground ore to a froth flotation step to produce a zinc concentrate, calcining the zinc concentrate to convert the zinc sulphide to zinc oxide, leaching the calcine with sulphuric acid to produce a leach solution comprising zinc sulphate and ferric sulphate, the improvement which comprises reducing the ferric sulphate to ferrous sulphate to produce a solution comprising zinc sulphate and ferrous sulphate and heating the solution in the presence of oxygen and in a pressure vessel at a temperature in excess of 110°C for a period of time not exceeding 30 minutes to precipitate out the iron from the solution.
9.
A process according to claim 8 wherein the solution comprising zinc sulphate and ferrous sulphate is heated at a temperature in excess of 110°C for a period of time not exceeding 10 minutes.
10 .
A process according to claim 8 or claim 9 wherein the solution comprising zinc sulphate and ferrous sulphate is heated at a temperature in excess of 180°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA849629 | 1984-12-11 | ||
| ZA84/9629 | 1984-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1245461A true CA1245461A (en) | 1988-11-29 |
Family
ID=25577644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000497084A Expired CA1245461A (en) | 1984-12-11 | 1985-12-06 | Precipitation of iron from sulphate solutions |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS61191525A (en) |
| AU (1) | AU569813B2 (en) |
| BE (1) | BE903830A (en) |
| CA (1) | CA1245461A (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5350097A (en) * | 1976-10-20 | 1978-05-08 | Dowa Mining Co | Process for preparing red iron oxide |
| JPS54134094A (en) * | 1978-04-10 | 1979-10-18 | Dowa Mining Co | Manufacture of black iron oxide |
| JPS602252B2 (en) * | 1980-03-17 | 1985-01-21 | 同和鉱業株式会社 | Method for producing ferric oxide |
| JPS603011B2 (en) * | 1980-05-22 | 1985-01-25 | 同和鉱業株式会社 | Production method of high-grade iron oxide for ferrite magnetic materials |
| CA1179966A (en) * | 1980-08-14 | 1984-12-27 | Bernard Verbaan | Leaching of zinc containing sulphide minerals |
| CA1195846A (en) * | 1982-06-03 | 1985-10-29 | Donald R. Weir | Recovery of zinc from zinc-containing sulphidic material |
| JPS5921527A (en) * | 1982-07-26 | 1984-02-03 | Tdk Corp | Iron oxide for soft ferrite and its manufacture |
| FR2537968B1 (en) * | 1982-12-21 | 1986-02-28 | Air Liquide | PROCESS FOR REMOVING IRON FROM LEACHING SOLUTIONS |
-
1985
- 1985-11-29 AU AU50514/85A patent/AU569813B2/en not_active Ceased
- 1985-12-06 CA CA000497084A patent/CA1245461A/en not_active Expired
- 1985-12-06 JP JP60273599A patent/JPS61191525A/en active Pending
- 1985-12-10 BE BE0/215991A patent/BE903830A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU5051485A (en) | 1986-06-19 |
| AU569813B2 (en) | 1988-02-18 |
| BE903830A (en) | 1986-04-01 |
| JPS61191525A (en) | 1986-08-26 |
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