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WO2003095687A1 - Procede d'oxydation - Google Patents

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Publication number
WO2003095687A1
WO2003095687A1 PCT/AU2003/000567 AU0300567W WO03095687A1 WO 2003095687 A1 WO2003095687 A1 WO 2003095687A1 AU 0300567 W AU0300567 W AU 0300567W WO 03095687 A1 WO03095687 A1 WO 03095687A1
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WO
WIPO (PCT)
Prior art keywords
species
oxidant
slurry
valuable
mineral
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.)
Ceased
Application number
PCT/AU2003/000567
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English (en)
Inventor
Robert John Ring
Douglas Edwin Collier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Australian Nuclear Science and Technology Organization
Original Assignee
Australian Nuclear Science and Technology Organization
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Filing date
Publication date
Application filed by Australian Nuclear Science and Technology Organization filed Critical Australian Nuclear Science and Technology Organization
Priority to AU2003225335A priority Critical patent/AU2003225335B2/en
Publication of WO2003095687A1 publication Critical patent/WO2003095687A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
    • C22B60/02—Obtaining thorium, uranium, or other actinides
    • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
    • C22B60/0208—Obtaining thorium, uranium, or other actinides obtaining uranium preliminary treatment of ores or scrap
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • 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
    • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
    • C22B60/02—Obtaining thorium, uranium, or other actinides
    • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
    • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
    • C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
    • C22B60/0226—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors
    • 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

Definitions

  • the present invention relates to mineral processing. More particularly, the invention relates to the processing of a mineral ore slurry, such as uranium ore slurry, containing oxidisable species such as elemental iron, Fe(II) and sulphur containing compounds, in addition to uranium(IV) and uranium(VI).
  • a mineral ore slurry such as uranium ore slurry
  • oxidisable species such as elemental iron, Fe(II) and sulphur containing compounds
  • acid leaching is frequently employed as a means of dissolving valuable species in the ore, so that the valuable species can be subsequently recovered from an aqueous phase, which is separated from the solid phase.
  • an oxidant is added to increase the rate at which oxidation takes place and/or to increase the amount of oxidisable species that is oxidised.
  • uranium ore it is desirable to oxidise as much as possible of any uranium (IV) that is present in the ore to uranium (VI), because the uranium (VI) is more soluble in an aqueous medium than uranium (IV).
  • Oxidants such as sodium chlorate and pyrolusite that are used for this purpose are expensive and contribute significantly to the processing cost of such minerals. There is accordingly a need for reducing the consumption of such oxidants in mineral processing.
  • mills such as rod mills and ball mills of which the rods or balls are made of steel
  • small amounts of elemental iron arising from wear of the iron components of such mills are present in the ore.
  • elemental iron has been shown by Wyllie, World Mining, February 1979, to have a strong reducing effect, and react with the oxidant in the acid leaching step.
  • a process for treating a slurry of a mineral ore including the step of contacting the slurry with oxygen or an oxygen containing gas, at a pH of 6 or greater, whereby an oxidisable magnetic species in the slurry is at least partially oxidised to a substantially insoluble species.
  • a process for treating a slurry of a mineral ore including the step of contacting the slurry with oxygen or an oxygen containing gas, at a pH of 6 or greater, whereby an oxidisable magnetic species in the slurry is at least partially oxidised to a species that consumes a lesser amount of oxidant added in a subsequent leaching step, than the oxidisable magnetic species.
  • the slurry is conveniently an aqueous slurry.
  • the oxygen containing gas may conveniently be air or air enriched with oxygen.
  • the mineral ore may be a uranium ore or any other type of mineral ore that needs to be oxidised in a subsequent leaching step.
  • the oxidisable magnetic species may be iron particles wherein iron is partially or substantially in its elemental form.
  • the iron particles may originate from a milling process to which the mineral ore had been subjected prior to the treatment process according to the invention.
  • Such milling process may include the passing of the ore through an ore mill, such as a ball mill or a rod mill, in which the ore is milled down to the required particle size distribution and in which the ore comes into contact with a steel surface such as a liner of the mill, or in which steel balls or rods are employed for the comminution ofthe ore, and such steel balls are worn away by the ore.
  • the substantially insoluble species is conveniently a species that does not consume oxidant or consumes only a small amount of oxidant or, alternatively, consumes a lesser amount of oxidant than the oxidisable species, in subsequent acid leaching of said mineral ore in the presence of said oxidant.
  • the process according to the invention may conveniently include a step, prior to the step in which the slurry is contacted with oxygen or a gas containing oxygen, in which at least a portion of the slurry is subjected to magnetic separation. In the magnetic separation step, a portion of the oxidisable magnetic species in such portion of the slurry, may be removed from the said portion of the slurry.
  • the invention includes in its scope a slurry of a mineral ore treated by the process ofthe invention.
  • a milled uranium ore contains more iron than is required in a subsequent acid leaching process in which the ore is leached under oxidising conditions
  • some of the iron may be removed from the ore by subjecting a portion of the ore to magnetic separation, whilst another portion of the ore may be subjected to a pre-leaching step in which it is contacted with air in accordance with the process ofthe invention.
  • the two portions of the ore may be combined after air pre-leaching of the one portion and magnetic separation of iron from the other portion. In this way, just enough iron may be left in the ore for purposes of oxidising the uranium(IN) that is in the ore, to uranium(VI).
  • the pH may be towards the lower end ofthe range of 5 to 9.5, 5 to 9, 5.1 to 9, 5.1 to 8, 5.1 to 7.5, 5.1 to 7, 5.1 to 6.5, 5.5 to 9, 6 to 9, 6 to 8, 6 to 7.5, 6 to 7, 6 to 6.5, 6.01 to 9, 6.01 to 8.5, 6.01 to 7.5, 6.01 to 7, or 6.01 to 6.5 more usually 6.01 to 8.
  • a preferred pH range is between 5.01 and 7.5.
  • the temperature at which the process in accordance with the invention may be carried out may range from about 0°C to about 100°C, usually from about 12°C to about 50°C and more usually from about 15°C to about 45°C with a preferred temperature being ambient temperature.
  • the oxygen containing gas is air.
  • the mineral ore slurry may be contacted with the air for a period of from about 10 minutes to about 24 hours, preferably from about 1 hour to about 8 hours, more preferably from about 1 hour to about 5 hours.
  • a method of reducing the consumption of oxidant in an acid leaching step in which a valuable species is recovered from a mineral ore slurry comprising the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the leaching step, at a pH of 5 or greater, whereby an oxidisable species in the mineral ore slurry is at least partially oxidised to an insoluble species.
  • a method of reducing the consumption of acid in an acid leaching step in which a valuable species is recovered from a mineral ore slurry comprising the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the leaching step, at a pH of 5 or greater, whereby an oxidisable species in the mineral ore slurry is at least partially oxidised to an insoluble species.
  • a method of improving the recovery of a valuable species from a mineral ore slurry in an acid leaching step in which the valuable species is recovered from the mineral ore slurry comprising the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the leaching step, at a pH of 5 or greater, whereby an oxidisable species in the mineral ore slurry is at least partially oxidised to an insoluble species.
  • the oxidisable species may, as an alternative, be oxidised to a species that consumes a lesser amount of oxidant added in a subsequent leaching step, than the oxidisable magnetic species.
  • a process for treating a slurry of a mineral ore including the step of contacting the slurry with a first oxidant, whereby the slurry or a portion thereof, after said contacting step, consumes a lesser amount of a second oxidant added in a subsequent leaching step, than it would have consumed without said contacting step.
  • the first oxidant may be the same or different and may be selected from oxygen, oxygen enriched air, sulphur dioxide, pyrolusite and any other suitable oxidants. Combinations of oxidants may be used.
  • the first oxidant may be a cheaper oxidant in terms of its ability to oxidise metals than the second oxidant.
  • the first oxidant preferably has a higher oxidation potential than an invaluable species forming part ofthe mineral ore slurry.
  • the second oxidant preferably has a higher oxidation potential than a valuable species forming part ofthe mineral ore slurry, and which is to be recovered therefrom.
  • the first oxidant may be oxygen or an oxygen containing gas
  • the second oxidant may be pyrolusite
  • the contacting step is preferably carried out under operating conditions, including pH, such that an invaluable species forming part of said mineral ore slurry, is at least partially converted by the first oxidant to a species which does not consume second oxidant or consumes less second oxidant in the subsequent leaching step than it would have consumed without said contacting step.
  • the process is conveniently operated at a pH of 5 or greater.
  • the process is conveniently operated at a pH greater than pH 5 and at most pH 9 or 9.5.
  • a method of reducing the consumption of second oxidant in an acid leaching step forming part of a process for the recovery of a valuable mineral from a mineral ore slurry containing the valuable mineral, wherein, in the acid leaching step, the valuable mineral is solubilised by oxidising it with the second oxidant converting the valuable species from an insoluble to a soluble form, the method comprising the step of contacting the mineral ore slurry with a first oxidant, prior to the acid leaching step, causing a portion of the mineral ore slurry to be at least partially converted to a form which does not consume second oxidant in the acid leaching step or which consumes less second oxidant than the mineral ore slurry would have consumed without said contacting step.
  • the first oxidant may be oxygen or an oxygen containing gas
  • the mineral ore slurry is contacted with the oxygen or an oxygen containing gas at a pH of 5 or greater, and the slurry may comprise an iron species.
  • the pH may be greater than pH 5 and at most pH 9 or 9.5.
  • a method of reducing the consumption of acid in an acid leaching step forming part of a process for the recovery of a valuable mineral from a mineral ore slurry containing the valuable mineral wherein, in an acid leaching step forming part of the process, the valuable mineral is solubilised by oxidising it with a second oxidant converting the valuable mineral from an insoluble to a soluble form, wherein the method comprises the step of contacting the mineral ore slurry with a first oxidant, prior to the acid leaching step, causing a portion of the mineral ore slurry or an invaluable species in the mineral ore slurry to be at least partially converted to a form which does not consume acid or which consumes less acid than the mineral ore slurry would have consumed in the acid leaching step if it had not been so contacted with said first oxidant.
  • the valuable mineral may be uranium
  • the invaluable species may be an iron species
  • the first oxidant may be oxygen or an oxygen containing gas
  • the mineral ore slurry may be contacted with the oxygen or the oxygen containing gas at a pH of 5 or greater.
  • the pH may be greater than pH 5 or pH 6 and at most pH 9 or pH 9.5.
  • a method of increasing the recovery of a valuable species in a process for the recovery of the valuable species from a mineral ore slurry containing it wherein the process includes a step of solubilising the valuable species in an acid leaching step in which the mineral ore slurry is oxidised to a soluble form by means of a second oxidant, the method including the step of contacting the mineral ore slurry with a first oxidant, prior to the acid leaching step, causing at least a portion ofthe mineral ore slurry or an invaluable species therein to be at least partially converted to a form which does not consume at least one of acid and oxidant in the acid leaching step, resulting in the increased recovery of the valuable species.
  • the valuable species may be uranium, the invaluable species may be an iron species, the first oxidant may be oxygen or an oxygen containing gas, and the mineral ore slurry may be contacted with the first oxidant such as oxygen or an oxygen containing gas at a pH of 5 or greater, optionally at a pH greater than pH 5.
  • the pH may be 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0 or 6.1 and at most pH 9.5, 9.4, 9.3, 9.2, 9.1 or 9.0, for example.
  • a process for treating a slurry of a mineral ore comprising an oxidisable invaluable species and a valuable species which is recoverable by oxidising said valuable species in an acid leach including the steps of
  • step (a) contacting the slurry with a first oxidant at a first pH; and (b) thereafter contacting the slurry, in the presence of a strong acid, with a second oxidant at a second pH which is lower than the first pH, wherein the first pH is such that the amount of an oxidised species derived from said invaluable species going into solution is such that the slurry or a portion thereof consumes a lesser amount of the second oxidant in step (b), than it would have consumed without said contacting step (a).
  • the first oxidant may be oxygen or an oxygen containing gas
  • the valuable species may be uranium
  • the invaluable species may be an iron species.
  • the first pH may be greater than pH 5 and the second pH may be about 0.1 to about 4, preferably about 1 to 3, more preferably about 2.
  • the second pH may be 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75, 3.0, 3.25, 3.5 or 4, for example.
  • a process for treating a slurry of a mineral ore including the step of contacting the slurry with oxygen or an oxygen containing gas, whereby the slurry is at least partially converted to a slurry that consumes a lesser amount of oxidant added in a subsequent leaching step, than the slurry would have consumed without said contacting step.
  • the insoluble species may be an iron species.
  • a method of reducing the consumption of oxidant in an acid leaching step in which an insoluble valuable species is recovered from a mineral ore slurry by oxidising it with an oxidant converting the insoluble valuable species to a soluble form, wherein the method comprises the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the acid leaching step, causing a portion of the mineral ore slurry or an insoluble first species in the mineral ore slurry to be at least partially converted to a form which does not consume oxidant in the acid leaching step.
  • a method of reducing the consumption of acid in an acid leaching step forming part of a process for the recovery of a valuable mineral from a mineral ore slurry containing the valuable mineral wherein, in an acid leaching step forming part of the process, the valuable mineral is solubilised by oxidising it with an oxidant converting the valuable mineral from an insoluble to a soluble form, the method comprising the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the acid leaching step, causing at least a portion ofthe mineral ore slurry or an insoluble first species in the mineral ore slurry to be at least partially converted to a form which does not consume acid or which consumes less acid than the mineral ore slurry would have consumed in the acid leaching step if it had not been so contacted with oxygen or an oxygen containing gas.
  • a method of increasing the recovery of an insoluble valuable species in a process for the recovery of the insoluble valuable species from a mineral ore slurry containing it wherein the process includes a step of solubilising the insoluble valuable species in an acid leaching step in which the mineral ore slurry is oxidised to a soluble form by means of an oxidant, the method including the step of contacting the mineral ore slurry with oxygen or an oxygen containing gas, prior to the acid leaching step, causing at least a portion ofthe mineral ore slurry or an insoluble first species therein to be at least partially converted to a form which does not consume at least one of acid and oxidant in the acid leaching step, resulting in the increased recovery ofthe insoluble valuable species.
  • the insoluble valuable species may be uranium or a compound thereof.
  • a process for treating a slurry of a mineral ore including the step of contacting the slurry with oxygen or an oxygen containing gas, whereby the slurry or a portion thereof, after said contacting step, consumes a lesser amount of oxidant added in a subsequent leaching step, than it would have consumed without said contacting step.
  • the contacting step is preferably carried out under operating conditions, including pH and temperature, such that an insoluble species forming part of said mineral ore slurry, other than a valuable species to be recovered therefrom, is at least partially converted by the oxygen to a species which does not consume oxidant or consumes less oxidant in the subsequent leaching step than it would have consumed without said contacting step.
  • the process is preferably operated at a pH of 5 or greater such as up to pH 9.5 or 9.0.
  • a process for treating a slurry of a mineral ore comprising an oxidisable invaluable species and a valuable species which is recoverable by oxidising said valuable species in an acid leach including the steps of
  • step (b) thereafter contacting the slurry, in the presence of a strong acid, with a second oxidant at a second pH which is lower than the first pH, wherein the first pH is such that the amount of an oxidised species derived from said invaluable species going into solution is such that the slurry or a portion thereof consumes a lesser amount of the second oxidant in step (b), than it would have consumed without said contacting step (a).
  • the first oxidant may be oxygen or an oxygen containing gas.
  • the valuable species may be uranium and the invaluable species may be an iron species and the first pH is preferably at least about pH 5.
  • the amount of the invaluable species which is converted in step (a) to a species which is oxidisable by said second oxidant in step (b) may be such that the slurry or a portion thereof consumes a lesser amount ofthe second oxidant in step (b).
  • Figure 1 is a diagrammatic block flow diagram of one embodiment of a process in accordance with the invention.
  • FIG. 2 is a diagrammatic block flow diagram of another embodiment of a process in accordance with the invention.
  • Figure 3 is a diagrammatic block flow diagram of a further embodiment of a process in accordance with the invention.
  • uranium ore slurry 12 is introduced into an aeration tank 14 in which the uranium ore slurry 12 is contacted with air 16 at atmospheric pressure, a pH of between 6 and 8 and ambient temperature of about 45°C.
  • the slurry 12 is contacted with the air 16 for a period of from about 2 to about 4 hours.
  • the air 16 may optionally be enriched with oxygen.
  • the slurry is transferred to a standard uranium leach tank 18, to which sulphuric acid 20 is added in order to reduce the pH to less than 2.5.
  • Oxidant in the form of pyrolusite 22 is also added to the leach tank 18, for conversion of
  • the amount of pyrolusite 22 used in the standard uranium leaching step is reduced, as is evident from
  • Example 2 Apart from a reduction in the consumption of oxidant, the amount of the uranium recovered may also be increased. In some cases, a reduction in the consumption of acid was also observed.
  • FIG. 2 there is shown a diagrammatic block flow diagram of another embodiment of a process 110 in accordance with the invention.
  • uranium ore slurry 112 is introduced into a magnetic separator 113 in which a magnetic fraction 112a is first separated from the ore, before it is fed to an aeration tank 114 in which the uranium ore slurry 112 is contacted with air 116 at atmospheric pressure, a pH of between 6 and 8 and ambient temperature of about 45°C.
  • the magnetic fraction 112a is discarded.
  • the slurry 112 is contacted with the air 116 for a period of from about 2 to about 4 hours.
  • the slurry is transferred to a standard uranium leach tank 118, to which sulphuric acid 120 is added in order to reduce the pH to less than 2.5.
  • Oxidant in the form of pyrolusite 122 is also added to the leach tank 118, for conversion of Fe(II) to Fe(III) which in turn oxidises any uranium (IV) present in the ore, to uranium
  • the amount of pyrolusite 122 used in the 1 leaching tank 118 is reduced as in the case of the process shown in Figure 1.
  • the amount of the uranium recovered may also be increased. In some cases, a reduction in the consumption of acid was also observed.
  • uranium ore slurry 212 is introduced into a magnetic separator 213 in which a magnetic fraction 212a is first separated from the ore slurry 212, before it is fed to an aeration tank 214 in which the uranium ore slurry 212 is contacted with air 216 at atmospheric pressure, a pH of between 6 and 8 and ambient temperature of about 45°C.
  • the slurry 212 is contacted with the air 216 for a period of from about 2 to about 4 hours.
  • the slurry is transferred to a standard uranium leach tank 218, to which sulphuric acid 220 is added in order to reduce the pH to less than 2.5.
  • Oxidant in the form of pyrolusite 222 is also added to the leach tank 218, for conversion of any uranium (IV) present in the ore, to uranium (VI).
  • a portion ofthe magnetic fraction 212a is discarded, whilst the remaining portion is intensively oxidised in a further tank 224 by the addition of sulphuric acid and by intensive aeration, preferably under pressure, for a time sufficient to dissolve all elemental iron particles, before the solution from that step, which contains ferric iron sulphate, is added to the uranium leach tank 218.
  • ferric iron sulphate serves the purpose of oxidising the uranium (IV) present in the ore, to uranium (VI), whilst being reduced to ferrous iron sulphate.
  • an oxidant may be added to the further tank 224.
  • the oxidant may be selected from oxygen, oxygen enriched air, sulphur dioxide, pyrolusite and other suitable oxidants. Combinations of oxidants maybe used.
  • the amount of pyrolusite 222 used in the leaching tank 218 is reduced as in the case of the processes shown in Figures 1 and 2.
  • the amount ofthe uranium recovered may also be increased. In some cases, a reduction in the consumption of acid was also observed.
  • Example 4 Effect of Flotation Flotation is both an aeration process and a sulphide removal process. It was expected that, with flotation of the ore, it would be difficult to differentiate between the effects of aeration and sulphide removal with regard to their influence on subsequent reduction in the consumption of oxidant in leaching. For this reason, aeration was compared with flotation. A preliminary set of flotation tests was carried out on primary an ore composite containing 0.744 %U 3 O 8 and 0.66% sulphur as S, so that the likely response of the ore to flotation could be assessed. These flotation results are given in Table 4. Although the flotation concentrates were observed to contain sulphide minerals, they also contained a considerable quantity of ore slimes. On the basis of the analyses ie lowest U loss and comparable Fe and S removal, the conditions used in test Example 2 were chosen for the flotation ofthe ore before leaching.
  • Increasing the aeration temperature from 45°C (508B/510B) to 65°C (510C) reduced the oxidant consumption from 2.5 to 1.78 kg t "1 , or by 29%.
  • Aerating at a higher pH of 8 reduced the oxidant consumption from 2.12 to 1.86 kg t "1 , or by 12%.
  • Increasing drying temperature from 40°C (509 A) to 80°C (510A) reduced the oxidant consumption from 1.6 to 1.25 kg t "1 , or by 22%. All reductions in oxidant requirement were accompanied by a reduction in acid consumption.
  • Example 8 Aeration of Uranium Slurry from pH 5.0-6.5
  • runs 541A, 541B and 541C Three runs (respectively referred to as runs 541A, 541B and 541C) in each of which an aeration pre-leach step was incorporated, were carried out at nominal pH values of respectively 5.0, 5.5 and neutral (meaning no deliberate acid addition). Although a single figure is used to indicate the nominal pH, the actual pH varied during the contacting step. Variations of as much as about 1 pH unit were observed over a period of three hours. In the case of Run 541B, the initial pH was measured as 6.65, whereafter it dropped to 4.94 after 1 hour, 4.71 after two hours. Lime was then added to prevent the pH from dropping too far, so that it was 4.96 after 3 hours.
  • the magnetic fraction was removed using a strong rare earth magnet and was analysed by electron microscopy. It was found to consist mostly of particles of mild steel. However, there was also evidence of chlorite, quartz, iron oxide, apatite, ilmenite and pyrite in smaller amounts. Table 10 Aeration re-leach at different Hs summar
  • Example 9 Solution assays after aeration pre-leach

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Abstract

L'invention concerne un procédé de traitement d'une boue d'un minerai, consistant à mettre en contact cette boue avec de l'oxygène ou un gaz contenant de l'oxygène, à entraîner la conversion au moins partielle d'une première espèce insoluble dans cette boue en une espèce consommant une plus faible quantité d'oxydant, lors d'une étape de lessivage ultérieure, que ladite espèce insoluble. Cette étape lors de laquelle cette boue est mise en contact avec de l'oxygène ou un gaz contenant de l'oxygène est réalisée à un pH supérieur ou égal à 5. Cette espèce insoluble peut être du fer métallique.
PCT/AU2003/000567 2002-05-10 2003-05-12 Procede d'oxydation Ceased WO2003095687A1 (fr)

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AU2003225335A AU2003225335B2 (en) 2002-05-10 2003-05-12 Oxidation process

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AUPS2222A AUPS222202A0 (en) 2002-05-10 2002-05-10 Oxidation process
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CN114609000B (zh) * 2022-05-11 2022-08-02 矿冶科技集团有限公司 降低磁黄铁矿磁性有效性的判断方法及应用

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US5308380A (en) * 1991-06-06 1994-05-03 African Oxygen Limited MIC oxygenation: "extraction of metals values from metals bearing ores"
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