WO2014122803A1 - Procédé pour la lixiviation d'or à partir de minerai d'or contenant de la pyrite - Google Patents

Procédé pour la lixiviation d'or à partir de minerai d'or contenant de la pyrite Download PDF

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Publication number
WO2014122803A1
WO2014122803A1 PCT/JP2013/060795 JP2013060795W WO2014122803A1 WO 2014122803 A1 WO2014122803 A1 WO 2014122803A1 JP 2013060795 W JP2013060795 W JP 2013060795W WO 2014122803 A1 WO2014122803 A1 WO 2014122803A1
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Prior art keywords
gold
leaching
ore
iron
ions
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PCT/JP2013/060795
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English (en)
Japanese (ja)
Inventor
和浩 波多野
由樹 青砥
健志 中村
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Jx日鉱日石金属株式会社
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Priority to AU2013204113A priority Critical patent/AU2013204113B2/en
Priority to JP2014560626A priority patent/JP6038192B2/ja
Priority to CA2897470A priority patent/CA2897470C/fr
Publication of WO2014122803A1 publication Critical patent/WO2014122803A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/04—Blast roasting
    • 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
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet processes
    • 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 a method for leaching gold from gold ore containing pyrite.
  • a technique using a wet method is known as a method for recovering gold from sulfide minerals containing gold.
  • leaching of gold in sulfide minerals into solutions has been performed by using chemicals such as cyanide, thiourea, thiosulfuric acid, and halogen gas.
  • chloride ions, iron ions as described in JP2009-235525A (Patent Document 1) and JP2009-235519A (Patent Document 2), It has also been proposed to use a gold leaching solution utilizing copper ions and bromide ions.
  • Patent Document 1 JP2009-235525A
  • Patent Document 2 JP2009-235519A
  • chemicals such as cyan, thiourea, thiosulfuric acid, and halogen gas that are highly toxic. It is extremely practical for leaching gold in copper sulfide ore, but when this is applied to pyrite, the gold leaching rate is not sufficient, leaving room for improvement. Yes.
  • the present invention has been made in view of the above circumstances, and in the gold leaching method from gold ore containing pyrite, without using chemicals such as highly toxic cyanide, thiourea, thiosulfuric acid, and halogen gas, It is an object to improve the leaching rate of slag.
  • a pretreatment including a step 1 of preparing a gold ore containing pyrite and a step 2 of oxidizing and baking the gold ore;
  • the gold ore after the pretreatment is brought into contact with a gold leaching solution containing halide ions under supply of an oxidant to leach the gold component in the ore, and then the liquid after the gold leaching and a residue containing iron are solid-liquid.
  • Separating step 3 This is a gold leaching method.
  • the gold leaching solution contains chloride ions and bromide ions.
  • the oxidation roasting in the step 2 is performed under conditions of 400 ° C. to 650 ° C.
  • the content of pyrite in the gold ore is 5 to 80% by mass.
  • the gold leaching step is performed while maintaining the pH of the gold leaching solution at 2.0 or lower.
  • step 2 of changing to an iron oxide having an oxidation number of 3 or more is one embodiment of the pretreatment method for gold ore according to the present invention.
  • Step 1 gold ore containing pyrite is prepared. This is because the purpose of the present invention is to increase the gold leaching rate in pyrite, which is hardly soluble and has a low gold leaching rate. However, other requirements such as the concentration of gold in the ore are not important.
  • the gold ore to be treated in the present invention may be subjected to a conventional beneficiation process such as flotation or specific gravity sorting. Grinding can reduce the particle size of the ore so that the gold leachate can easily come into contact with the gold inside the ore.
  • the gold concentration in the gold ore is typically about 0.1 to 100 ppm by mass, and more typically about 1 to 20 ppm by mass.
  • the gold ore may contain chalcopyrite, galena, sphalerite, arsenite, kyanite, pyrrhotite, etc., but in an exemplary embodiment of the present invention pyrite Is used, and in a more typical embodiment of the present invention, a gold ore containing 30% by mass or more of pyrite is used. By using such gold ore, the effect of the pretreatment according to the present invention is remarkably exhibited.
  • the content of pyrite in the gold ore is not particularly limited, and may be 100% by mass, but typically 80% by mass or less.
  • step 2 the gold ore is oxidized and roasted. Gold ore after undergoing oxidative roasting has significantly improved solubility in gold leachate.
  • the pyrite in the gold ore is preferably changed to iron oxide.
  • the iron oxide is typically Fe 2 O 3 (haematite) having an oxidation number of 3.
  • the reaction formula at this time can be expressed by the following formula. 4FeS 2 + 11O 2 ⁇ 2Fe 2 O 3 + 8SO 2 If oxidative roasting is incomplete, pyrite can be changed to iron oxide (FeO) or iron (II) sulfide (FeS) having an oxidation number of 2.
  • the oxidation roasting is preferably carried out at a temperature of 400 ° C. to 650 ° C., more preferably 500 to 630 ° C., even more preferably 550 ° C. to 620 ° C., and most preferably 600 ° C.
  • the molar fraction of oxygen in the reaction atmosphere is preferably 1/5 or more, but it is practical to carry out under conditions using air from the viewpoint of economy.
  • a tubular furnace and a rotary kiln can be used.
  • Gold leaching step In one embodiment of the gold leaching method according to the present invention, the gold ore after the pretreatment is brought into contact with a gold leaching solution containing halide ions under supply of an oxidizing agent, and the gold component in the ore Next, the step 3 of solid-liquid separation into liquid and residue after gold leaching is performed. Since the iron has been changed to iron oxide having an oxidation number of 3 by pretreatment, iron can be precipitated by setting the pH to 1.5 or more at the time of gold leaching. There is no need to leach and remove.
  • Gold leaching proceeds when the eluted gold reacts with halide ions, particularly chloride ions or bromide ions, to form gold halide complexes, particularly gold chloride complexes or gold bromide complexes.
  • Chloride ions alone may be used as halide ions in the gold leaching solution.
  • the iron ions function to oxidize gold by trivalent iron ions oxidized under the supply of an oxidizing agent or trivalent iron ions from the beginning. Therefore, the gold leaching solution preferably contains trivalent iron ions from the beginning.
  • the gold leachate preferably contains copper ions. This is because copper ions are not directly involved in the reaction, but the presence of copper ions increases the oxidation rate of iron ions.
  • the contact method between the gold leachate and the gold ore is not particularly limited, and there are methods such as spreading and dipping. From the viewpoint of reaction efficiency, a method of dipping the residue in the leachate and stirring is preferable.
  • chloride metal salt examples include copper chloride (cuprous chloride, cupric chloride), iron chloride (ferrous chloride, ferric chloride), and alkali metals (lithium, sodium, potassium, rubidium, cesium, francium). And chlorides of alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, radium), and sodium chloride is preferred from the viewpoint of economy and availability. Moreover, since it can utilize also as a supply source of copper ion and iron ion, it is also preferable to utilize copper chloride and iron chloride.
  • the source of bromide ions is not particularly limited, and examples thereof include hydrogen bromide, hydrobromic acid, metal bromide, bromine gas, and the like.
  • the form of metal bromide salt It is preferable to supply by.
  • metal bromide salts include copper bromide (cuprous bromide, cupric bromide), iron bromide (ferrous bromide, ferric bromide), and alkali metals (lithium, sodium, potassium). , Rubidium, cesium, francium) and bromides of alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, radium), and sodium bromide is preferred from the viewpoint of economy and availability.
  • it can utilize also as a supply source of copper ion and iron ion, it is also preferable to utilize copper bromide and iron bromide.
  • Copper ions and iron ions are usually supplied in the form of these salts.
  • they can be supplied in the form of halide salts.
  • copper ions are preferably supplied as copper chloride and / or copper bromide
  • iron ions are preferably supplied as iron chloride and / or iron bromide.
  • copper chloride and iron chloride it is preferable to use cupric chloride (CuCl 2 ) and ferric chloride (FeCl 3 ) from the viewpoint of oxidizing power, respectively, but cuprous chloride (CuCl) and ferric chloride are preferable.
  • the concentration of chloride ions in the gold leachate used in step 3 is more preferably 30 g / L to 125 g / L.
  • the bromide ion concentration in the gold leachate used in Step 3 is preferably 1 g / L to 100 g / L from the viewpoint of reaction rate and solubility, and from the viewpoint of economy, it is 10 g / L to 40 g / L. More preferably.
  • the total concentration of chloride ions and bromide ions in the gold leaching solution is preferably 120 g / L to 200 g / L. From the viewpoint of gold leaching efficiency, the weight concentration ratio of bromide ions to chloride ions in the gold leaching solution is preferably 1 or more.
  • the oxidation-reduction potential (vs Ag / AgCl) of the leaching solution at the start of Step 3 is preferably 550 mV or more, more preferably 600 mV or more from the viewpoint of promoting gold leaching.
  • the pH is preferably 1.5 or more. However, if the pH is too high, iron and copper that promote leaching are precipitated, and thus the pH of the gold leaching solution is 2. 5 or less is preferable, and 1.8 to 2.0 is more preferable.
  • the temperature of the gold leachate is preferably 45 ° C. or higher from the viewpoint of increasing the gold leach rate, and more preferably 60 ° C. or higher. However, if it is too high, the leachate will evaporate and the heating cost will increase. It is preferable to set it as follows, and it is more preferable to set it as 85 degrees C or less.
  • At least one of hydrochloric acid and bromic acid, and chloride chloride are selected on the condition that the gold leachate in step 3 is selected to contain both chloride ions and bromide ions.
  • a mixed liquid containing at least one of dicopper and cupric bromide, at least one of ferric chloride and ferric bromide, and at least one of sodium chloride and sodium bromide can be used.
  • the gold leaching step of step 3 is performed while supplying the oxidizing agent, thereby managing the redox potential. If an oxidizing agent is not added, the redox potential is lowered in the middle, and the leaching reaction does not proceed.
  • an oxidizing agent For example, oxygen, air, chlorine, a bromine, hydrogen peroxide, etc. are mentioned. An oxidant with an extremely high redox potential is not necessary and air is sufficient. Air is also preferable from the viewpoint of economy and safety.
  • residues containing iron can be removed by solid-liquid separation.
  • the solid-liquid separation method include known methods such as filtration, squeezing, decanting, and centrifugation, and are not particularly limited, but a filter press that is easy to operate and can be made into a low water content residue is preferable.
  • Gold can be recovered from the resulting gold solution.
  • the metal analysis method used in the examples was ICP-AES.
  • gold analysis gold in the sample was precipitated by the ash blowing method, and then quantitative analysis was performed by ICP-AES.
  • leaching treatment was performed at a liquid temperature of 85 ° C. for 12 hours using a hydrochloric acid acidic gold leaching solution having the composition shown in Table 1 at a pulp concentration of 100 g / L.
  • a hydrochloric acid acidic gold leaching solution having the composition shown in Table 1 at a pulp concentration of 100 g / L.
  • air blowing 0.1 L / min with respect to 1 L of concentrate
  • stirring were continued, and the oxidation-reduction potential (ORP: vs Ag / AgCl) was maintained at 550 mV or more.
  • ORP oxidation-reduction potential
  • hydrochloric acid was appropriately added so that the pH of the gold leaching solution was maintained at 2.0 or lower and 1.5 or higher. Changes in pH and ORP of the gold leaching solution as the leaching time elapses are shown in Table 2 and FIG.
  • FIG. 3 shows the relationship between the leaching time and the Fe concentration in the leachate obtained from the results of the test.
  • FIG. 4 shows the relationship between the leaching time and the gold leaching rate.
  • the leaching rate of Au was calculated by the following formula: (1 ⁇ residual Au grade ⁇ residue rate / original ore Au grade) ⁇ 100.
  • the iron oxide after roasting dissolved immediately and at the same time the pH rose to 1.8 or more, so iron precipitated as iron oxyhydroxide (goethite).
  • Au was leached because the Au particles contained in the ore were exposed to the leachate as the iron oxide was dissolved.
  • Example 1 The same pyrite concentrate (0.5 kg) as in Example 1 was prepared. Next, without oxidative roasting, the same gold leachate as in Example 1 was used to obtain a pulp concentration of 100 g / L, and a leaching treatment was performed at a liquid temperature of 85 ° C. for 12 hours. During the leaching process, air blowing (0.1 L / min with respect to 1 L of concentrate) and stirring were continued, and the oxidation-reduction potential (ORP: vs Ag / AgCl) was maintained at 550 mV or higher. During the leaching, hydrochloric acid was appropriately added so that the pH of the gold leaching solution was maintained at about 1.1. During the leaching process, filtration was performed every 6 hours, and the residue was treated in fresh leaching solution.
  • ORP oxidation-reduction potential
  • the gold quality in the original mine was 6.0 g / t, but it decreased only to 4.6 g / t even after 12 hours of leaching.
  • the relationship between the leaching time and the gold leaching rate is shown in FIG.

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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)
  • Geochemistry & Mineralogy (AREA)
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  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention porte sur un procédé pour la lixiviation d'or à partir d'un minerai d'or contenant de la pyrite, le taux de lixiviation de l'or étant amélioré sans nécessiter l'utilisation d'une substance chimique hautement toxique telle qu'un cyanure, la thiourée, l'acide thiosulfurique et un halogène gazeux. Le procédé pour la lixiviation d'or comprend : une étape de prétraitement comprenant une étape (1) consistant à utiliser un minerai d'or contenant de la pyrite et une étape (2) consistant à oxyder et griller le minerai d'or; et une étape (3) consistant à mettre le minerai d'or prétraité en contact avec une solution de lixiviation de l'or contenant un ion halogénure tout en introduisant un agent oxydant pour ainsi lixivier un constituant de l'or à partir du minerai, et ensuite effectuer une séparation solide/liquide du produit ainsi obtenu en une solution contenant de l'or lixivié et un résidu contenant du fer.
PCT/JP2013/060795 2013-02-07 2013-04-10 Procédé pour la lixiviation d'or à partir de minerai d'or contenant de la pyrite WO2014122803A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2013204113A AU2013204113B2 (en) 2013-02-07 2013-04-10 Method for leaching gold from gold ore containing pyrite
JP2014560626A JP6038192B2 (ja) 2013-02-07 2013-04-10 黄鉄鉱を含有する金鉱石からの金の浸出方法
CA2897470A CA2897470C (fr) 2013-02-07 2013-04-10 Procede pour la lixiviation d'or a partir de minerai d'or contenant de la pyrite

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013022683 2013-02-07
JP2013-022683 2013-02-07

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WO2014122803A1 true WO2014122803A1 (fr) 2014-08-14

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JP (1) JP6038192B2 (fr)
AU (1) AU2013204113B2 (fr)
CA (1) CA2897470C (fr)
CL (1) CL2015002159A1 (fr)
WO (1) WO2014122803A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107034353A (zh) * 2017-04-27 2017-08-11 中南大学 一种低温焙烧酸浸解离金的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07508073A (ja) * 1992-06-26 1995-09-07 インテック　プロプライエタリー　リミテッド 鉱物からの金属の製造方法
JP2009526912A (ja) * 2006-02-17 2009-07-23 オウトテック オサケイティオ ユルキネン 金回収方法
JP2009235525A (ja) * 2008-03-27 2009-10-15 Nippon Mining & Metals Co Ltd 金の浸出方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5364444A (en) * 1993-07-08 1994-11-15 North American Pallidium Ltd. Metal leaching and recovery process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07508073A (ja) * 1992-06-26 1995-09-07 インテック　プロプライエタリー　リミテッド 鉱物からの金属の製造方法
JP2009526912A (ja) * 2006-02-17 2009-07-23 オウトテック オサケイティオ ユルキネン 金回収方法
JP2009235525A (ja) * 2008-03-27 2009-10-15 Nippon Mining & Metals Co Ltd 金の浸出方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ARRIAGADA, F. J. ET AL.: "ROASTING OF AURIFEROUS PYRITE CONCENTRATES", PROCESS MINERALOGY 2: APPLICATIONS IN METALLURGY, CERAMICS AND GEOLOGY, 1982, pages 173 - 186 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107034353A (zh) * 2017-04-27 2017-08-11 中南大学 一种低温焙烧酸浸解离金的方法

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AU2013204113A1 (en) 2014-08-21
CA2897470C (fr) 2017-09-19
JPWO2014122803A1 (ja) 2017-01-26
CA2897470A1 (fr) 2014-08-14
AU2013204113B2 (en) 2015-07-23
CL2015002159A1 (es) 2015-11-27
JP6038192B2 (ja) 2016-12-07

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