WO2012151721A1 - Procédé humide pour prétraitement de minerai de concentré d'or réfractaire carboné - Google Patents

Procédé humide pour prétraitement de minerai de concentré d'or réfractaire carboné Download PDF

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Publication number
WO2012151721A1
WO2012151721A1 PCT/CN2011/001024 CN2011001024W WO2012151721A1 WO 2012151721 A1 WO2012151721 A1 WO 2012151721A1 CN 2011001024 W CN2011001024 W CN 2011001024W WO 2012151721 A1 WO2012151721 A1 WO 2012151721A1
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Prior art keywords
nitrate
slurry
gold concentrate
carbonaceous
gold
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PCT/CN2011/001024
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English (en)
Chinese (zh)
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长春黄金研究院
中国黄金集团公司技术中心
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Application filed by 长春黄金研究院, 中国黄金集团公司技术中心 filed Critical 长春黄金研究院
Publication of WO2012151721A1 publication Critical patent/WO2012151721A1/fr

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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
    • 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

Definitions

  • the present invention relates to a wet pretreatment method for a carbonaceous refractory gold concentrate.
  • Background Art A method of immersing gold from a gold-containing mineral raw material with cyanide is called a cyanidation method.
  • the cyanidation process is the most important method for leaching gold from gold mines and metallurgical plants in various countries around the world.
  • Most of the gold in the general refractory gold concentrate is micro-book
  • the dip-dyed form is distributed among the sulfide minerals.
  • the gold leaching rate directly by the cyanidation method is very low.
  • the gold concentrate needs to be pretreated, and then the gold is leached by cyanidation.
  • the pretreatment methods for general refractory gold concentrates include calcination oxidation, bacterial oxidation, reactor oxidation, and chemical oxidation.
  • Carbon refractory gold concentrate is a refractory gold concentrate containing adsorbent active carbonaceous mineral components. This carbonaceous component seriously interferes with the leaching of gold by cyanidation. Therefore, it is called gold immersion gold in the gold mining industry. Concentrate is "double refractory gold concentrate”.
  • Carbonaceous minerals include organic carbon and amorphous elemental carbon.
  • the calcination oxidation method is generally carried out by air or oxygen enrichment in a calcining furnace at a temperature of from 500 ° C to 700 ° C.
  • the pretreatment of carbonaceous refractory gold concentrate by roasting oxidation method can oxidize sulfide minerals and carbonaceous materials, and the technical index of leaching gold by cyanidation is significantly improved, but the environmental pollution problem of S0 2 is generated during roasting, and roasting The process is difficult to control in the best roasting conditions and other reasons, so that the cyanide gold leaching index of the calcine is reduced.
  • the bacterial oxidation method is an inorganic nutrient necessary for the growth of bacteria in a bioreactor inoculated with inorganic autotrophic bacteria such as Thiobacillus thiooxidans, Thiobacillus ferrooxidans, and Mycobacterium spirulina, and is blown into the bioreactor by a blower. air.
  • the sulfide mineral is oxidized by direct and indirect action of inorganic autotrophic bacteria in the bioreactor.
  • the industrialization of bacterial oxidation has been applied to the pretreatment of refractory gold concentrates for more than 20 years, but the pretreatment effect of the carbon refractory gold concentrate bacterial oxidation method is not good.
  • the sulfide mineral is oxidized at a hot slurry temperature.
  • the preferred slurry temperature varies depending on the nature of the ore, and is generally in the range of 120 ⁇ to 180 ⁇ . The higher the temperature of the slurry, the greater the pressure of the water vapor in the reactor.
  • the industrialization of the reactor oxidation process has been applied to the pretreatment of refractory gold concentrates for more than 20 years, but the pretreatment effect on carbonaceous refractory gold concentrates is not good.
  • the chemical oxidation method is the oxidation of a refractory gold concentrate with an oxidizing agent such as hydrogen peroxide, persulfate, permanganate, manganese dioxide, liquid chlorine, hypochlorite, chlorate or nitric acid. Because of the large amount of oxidizing agent used in the chemical oxidation method, the price is high, the application cost is high, and it is difficult to adopt industrially.
  • an oxidizing agent such as hydrogen peroxide, persulfate, permanganate, manganese dioxide, liquid chlorine, hypochlorite, chlorate or nitric acid.
  • the purpose of the present invention is to solve the problem of difficulty in leaching gold of a carbonaceous refractory gold concentrate, and to provide a wet pretreatment method of carbonaceous refractory gold concentrate, which uses oxygen as an oxidant, nitric acid or nitrate.
  • a catalyst not only oxidative decomposition of sulfide minerals, but also oxidative decomposition of carbonaceous materials, the root of "double difficult treatment" has been eliminated, and the pretreatment effect has been greatly improved.
  • the method of the invention is: after the gold concentrate is ground to a -0.074mm grain-level solid mass content of 90_100%, the slurry solid mass concentration is adjusted to 20 ⁇ 10% and fed into the reaction kettle, and the reaction kettle is passed through Oxidation and decomposition of sulfide minerals and carbonaceous minerals, using nitric acid or nitrate as a catalyst, operating conditions are nitric acid or nitrate dosage 0.15-0.55mol / L, pulp temperature 180-240 ° C, total pressure in the kettle 2.6-5.6 MPa, the residence time of the slurry in the kettle is 60-300 min.
  • the nitrate is one of or a combination of two or a combination of sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate and ammonium nitrate or a combination of four or five thereof.
  • the beneficial effects of the invention are as follows: the method uses oxygen as an oxidant, nitric acid or nitrate as a catalyst, not only oxidatively decomposes sulfide minerals, but also oxidizes and decomposes carbonaceous materials, thereby eliminating the root cause of "difficult to treat" and greatly improving the pretreatment effect.
  • the gold leaching rate by the cyanidation method can be more than 90%.
  • Figure 1 is a flow chart of the method of the present invention.
  • the pretreatment of the carbonaceous refractory gold concentrate of the present invention is carried out in the following order:
  • the reactor is fed with nitric acid or nitrate as a catalyst, and is oxidized to oxidize sulfide minerals and carbonaceous materials by oxygen.
  • the operating conditions are 0.15-0.55 mol/L of nitric acid or nitrate, and the temperature of the slurry is 180-240 °. C, the total pressure in the kettle is 2.6-5.6 MPa, and the residence time of the slurry is 60-300 min; the nitrate is one of sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate and ammonium nitrate or a combination thereof or three thereof Combinations or combinations of four or five.
  • the oxidative decomposition of sulfide minerals in gold concentrate produces sulfuric acid and sulfate, which makes the slurry solution acidic, taking the oxidation reaction of the main sulfide mineral pyrite in gold concentrate as an example.
  • NO 2 is soluble in water and produces nitric acid
  • nitric acid is then reacted with carbonaceous, and the produced NO is reoxidized to form nitric acid.
  • Oxygen is consumed during this cycle, and nitric acid is not consumed by regeneration after the reaction.
  • carbonaceous electrons are transferred to the oxygen atom of oxygen through the nitrogen atom of nitric acid, so oxygen is the oxidant and nitric acid is the catalyst.
  • Carbon refractory gold concentrate A contains 35.19g/t of gold, 0.94% of amorphous carbon in carbon, 0.81% of organic carbon, 15.70% of sulfur, 0.94% of arsenic and 16.46% of iron.
  • the sulfide minerals are mainly pyrite, followed by poisonous sand.
  • This gold concentrate is pretreated and cyanated immersion gold in the following order:
  • the gold concentrate is ground to a particle size of -0.074mm with a ball mill of 90-100%, and the mass concentration of the slurry solid is adjusted to 20-40%, which is fed into the reaction kettle;
  • the reactor is fed with nitric acid or nitrate as a catalyst, and is oxidized with oxygen to oxidize carbonaceous materials.
  • the nitrates described herein are one of sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate and ammonium nitrate. Or two combinations thereof or three combinations thereof, or four combinations or five combinations thereof, the operating conditions are nitric acid or nitrate dosage 0.35-0.55 mol/L, pulp temperature 200-240 ° C, total pressure in the kettle 2.6- 5.6 MPa, slurry residence time 60-300min;
  • Example 1 The carbonaceous refractory gold concentrate A used in Example 1 was used, and the same working procedure as in Example 1 was employed. The operating conditions were different from those in Example 1 in that the working book (2) was not fed with nitric acid or nitrate. As the catalyst, the remaining operating conditions were identical to those of Example 1. The gold leaching rate was lower than 70% after repeated comparison test results. It can be seen that the use of nitric acid or nitrate as a catalyst can significantly improve the pretreatment effect of carbon refractory gold concentrate.
  • Carbon refractory gold concentrate B contains 24.98g/t, amorphous carbon in the carbon material is 0.98%, organic carbon is 0.78%, sulfur is 16.22%, arsenic is 0.80%, and iron is 15.91%.
  • the sulfide minerals are mainly pyrite, followed by poisonous sand.
  • This gold concentrate is pretreated and cyanated immersion gold in the following order:
  • the gold concentrate is ground to a particle size of -0.074mm by a ball mill to 98%, and the mass concentration of the slurry solid is adjusted to 25%, and is fed into the reaction kettle;
  • the reactor is fed with nitric acid as a catalyst, and oxygen is introduced for oxidation pretreatment.
  • the operating conditions are 0.15-0.45 mol L of nitric acid, 180-240 ° C of pulp temperature, and 2.8-5.6 MPa of total pressure in the autoclave. , slurry residence time 90-240min;
  • Carbon refractory gold concentrate C contains 37.25g/t, amorphous elemental carbon 1.33%, organic carbon 1.02%, sulfur 17.56%, arsenic 0.90%, iron 18.09%.
  • the sulfide minerals are mainly pyrite, followed by poisonous sand.
  • This gold concentrate is pretreated and cyanated immersion gold in the following order:
  • the gold concentrate is ground to a particle size of -0.074mm with a ball mill of 98%, and the mass concentration of the slurry is adjusted to 25%, and is fed into the reaction kettle;
  • the reactor is fed with nitric acid as a catalyst, and oxygen is added to oxidize the carbonaceous material.
  • the operating conditions are 0.15-0.4 mol/L of nitric acid, 180-240 °C of slurry temperature, and 2.8-5 MPa of total pressure in the autoclave. , slurry residence time 120-300min;

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention concerne un procédé humide pour prétraiter des minerais de concentré d'or réfractaire carboné qui comprend les étapes suivantes : broyage des minerais de concentré d'or à une granularité de ‑0,074 mm avec une teneur en masse de 90 à 100 % par broyage de minerai, puis ajustement de la concentration solide de suspension concentrée de minerais à 20 à 40 % en masse dans un réacteur, alimentation d'oxygène dans le réacteur pour oxyder et décomposer un minéral de sulfure et un minéral carboné, ajout de 0,15 à 0,55 mole/l d'acide nitrique ou nitrates en tant que catalyseurs, la rétention de la suspension concentrée de minerai dans le réacteur pendant 60 à 300 min, la température de la suspension concentrée de minerai étant maintenue à 180 à 240 °C et la pression totale du réacteur à 2,6 à 5,6 MPa. Le procédé peut notamment améliorer l'effet de prétraitement.
PCT/CN2011/001024 2011-05-10 2011-06-20 Procédé humide pour prétraitement de minerai de concentré d'or réfractaire carboné WO2012151721A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011101189360A CN102181632A (zh) 2011-05-10 2011-05-10 一种碳质难浸金精矿的湿法预处理方法
CN201110118936.0 2011-05-10

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WO2012151721A1 true WO2012151721A1 (fr) 2012-11-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022217350A1 (fr) * 2021-04-12 2022-10-20 Hatch Ltd. Traitement hydrométallurgique de minerais ou de concentrés pour l'élimination de matériau de carbone organique adsorbant l'or ("preg-robbing")

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105907961A (zh) * 2016-05-04 2016-08-31 长春黄金研究院 一种氧化剂与催化剂协同强化含砷金精矿的氧化预处理方法
CN108034836A (zh) * 2017-11-30 2018-05-15 广西大学 硫化物型金精矿的预氧化方法
CN110724816B (zh) * 2019-09-27 2021-05-14 四川顺应动力电池材料有限公司 用硝酸做氧化剂循环浸出金属硫化矿的方法及其装置系统
CN114540634B (zh) * 2022-01-21 2023-02-14 浙江大学 一种高浓度盐溶液提取贵金属元素的方法

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AU6546699A (en) * 1998-10-26 2000-05-04 Perserverance Corporation Limited Carbon treatment process
CN101314815A (zh) * 2008-06-13 2008-12-03 东华大学 一种高硫高砷难选金精矿常压催化氧化方法

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CN101624648B (zh) * 2009-08-14 2011-04-27 东华大学 一种用于NOx循环催化氧气氧化预处理难浸金矿的反应系统

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AU6546699A (en) * 1998-10-26 2000-05-04 Perserverance Corporation Limited Carbon treatment process
CN101314815A (zh) * 2008-06-13 2008-12-03 东华大学 一种高硫高砷难选金精矿常压催化氧化方法

Non-Patent Citations (4)

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Title
CUI LISHENG ET AL.: "Status Quo Of Pretreatment Technique Of Refractory Gold Ores", METAL MINE, no. 7, July 2005 (2005-07-01), pages 6 - 9 *
HE RIYING: "An Experimental Research on Nitric Acid Oxidation Extrating Technique of Gold Concentrate", GOLD, vol. 28, no. 5, 2007, pages 36 *
LI DAJIANG: "Research Process In Chemical Pre-Oxidation For Refractory Gold Ores", MINING AND METALLURGY, vol. 20, no. 1, March 2011 (2011-03-01), pages 50 - 51 *
MA JINHUAN: "Study On Process Flow Of Gold Extracting From Gold Ores Bearing Arsenic And Carbon", GOLD, vol. 11, no. 4, 1990, pages 25 - 29 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022217350A1 (fr) * 2021-04-12 2022-10-20 Hatch Ltd. Traitement hydrométallurgique de minerais ou de concentrés pour l'élimination de matériau de carbone organique adsorbant l'or ("preg-robbing")

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