CN103131856A - Bio-electrochemical system used for copper sulfide ore leaching - Google Patents

Bio-electrochemical system used for copper sulfide ore leaching Download PDF

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Publication number
CN103131856A
CN103131856A CN2013100635984A CN201310063598A CN103131856A CN 103131856 A CN103131856 A CN 103131856A CN 2013100635984 A CN2013100635984 A CN 2013100635984A CN 201310063598 A CN201310063598 A CN 201310063598A CN 103131856 A CN103131856 A CN 103131856A
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China
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ore deposit
copper
leaching
soaking
elemental sulfur
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CN2013100635984A
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赵峰
梁方圆
肖勇
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Institute of Urban Environment of CAS
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Institute of Urban Environment of CAS
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Priority to CN2013100635984A priority Critical patent/CN103131856A/en
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    • 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

Abstract

The invention belongs to the bioleaching field and relates to a bio-electrochemical system used for copper sulfide ore leaching. The system utilizes the electron transfer capability of microbes to improve the copper sulfide leaching efficiency, recover elemental sulfur and generate electricity. The system is composed of an anode chamber, a cathode chamber, a cation exchange membrane and an external circuit. Fe<2+> in the anode chamber is oxidized to Fe<3+> under the action of ore leaching bacteria Acidithiobacillus ferrooxidans, copper sulfide reacts with the oxidation product Fe<3+> to obtain Cu<2+> and elemental sulfur, and Fe<3+> is reduced to Fe<2+> which is reused by the ore leaching bacteria. The transfer of electrons to a cathode from an anode promotes the oxidation of Fe<2+> to Fe<3+> and indirectly promotes the leaching of Cu<2+>. The bio-electrochemical system used in the invention has the advantages of simple technology, easy operation, and low operation cost, and has practical application values.

Description

A kind of bioelectrochemistry system for the copper-sulphide ores leaching
Technical field
The present invention relates to a kind of bioelectrochemistry system for the copper-sulphide ores leaching, this system utilizes the electronics transmission capacity raising of microorganism to soak ore deposit efficient, and can reclaim elemental sulfur and electrogenesis.
Background technology
Copper mine is very abundant at the reserves of occurring in nature.But China's copper resource has significant large ore deposit, rich ore is few, little ore deposit, the characteristics that lean ore is many, and therefore from Treating Low-grade Copper Ores, copper being leached has important meaning.Extract the conventional metallurgical technology of copper from Treating Low-grade Copper Ores, its cost compare is high and seriously polluted.The Bioleaching technology is low because of its cost, technique simple and non-secondary pollution is that present Treating Low-grade Copper Ores leaches copper method commonly used, but also there are some limitation in it, and activity as slow in speed of response, bacterium is lower.Improve the leaching rate key and be to improve the activity of soaking the ore deposit bacterium, soak the ore deposit bacterium Acidithiobacillus ferrooxidansHave electron transfer function, therefore, the present invention adopts bio-electrochemical process to utilize the electronics transmission capacity of microorganism to promote Cu 2+Leaching process, improve leaching rate.In addition, vitriol can endanger natural ecosystems, and for the pollution problem of vitriol, the present invention's ore deposit bacterium culture medium that soaks used is with Cl -Be Main Anions.
Summary of the invention
The present invention is to soak the ore deposit bacterium Acidithiobacillus ferrooxidans(4) and the bioelectrochemistry system be the basis, purpose is synchronously to realize soaking the ore deposit, reclaim elemental sulfur and electrogenesis, by the following technical solutions:
(a) according to accompanying drawing 1 erecting device;
(b) cationic exchange membrane (2) is divided into anolyte compartment (A) and cathode compartment (B) with device, and anolyte compartment (A) is anaerobic environment, and cathode compartment (B) is aerobic environment;
(c) in the bioelectrochemistry system, electronics is delivered to negative electrode (3) from anode (1), the mobile promotion Fe of electronics 2+Be oxidized to Fe 3+, indirectly promoted Cu 2+Leaching.
Used soak the ore deposit bacterium for have a liking for the ferrous thiobacillus of acid oxidase ( Acidithiobacillus ferrooxidans) (4), the growth of its optimization and electrogenesis condition are temperature 28-32 oC, pH value 1.8-2.5.
Inoculum in anolyte compartment (A) is with Cl -Be Main Anions, specifically react as follows:
Fe 2+ → Fe 3+ + e -
CuS + Fe 3+ → Cu 2+ + S + Fe 2+
Fe 2+ Acidithiobacillus ferrooxidans(4) be oxidized to Fe under effect 3+, cupric sulfide and oxidation products Fe 3+Chemical reaction occurs obtain Cu 2+And simple substance S, and again obtain Fe 2+
The transmitance of cationic exchange membrane used (2) is 96%, and film thickness is 0.3mm, bursting strength 〉=0.5MPa.
Electrode materials in anolyte compartment (A) and cathode compartment (B) is the carbon felt, and thickness is 0.3-0.8cm.Be connected 5 with the titanium silk with external circuit between anode (1) and negative electrode (3)) connect.
Description of drawings
Fig. 1 is the bioelectrochemistry system principle schematic diagram for the copper-sulphide ores leaching of the present invention.
Indicate in figure:
A-anolyte compartment, B-cathode compartment, 1-anode, 2-cationic exchange membrane, 3-negative electrode, 4-soak the ore deposit bacterium Acidithiobacillus ferrooxidans, 5-external circuit.
Embodiment
Embodiment one: device is installed
According to principle schematic erecting device shown in Figure 1: cationic exchange membrane (2) is divided into anolyte compartment (A) and cathode compartment (B) with device, and the transmitance of cationic exchange membrane used (2) is 96%, and film thickness is 0.3mm, bursting strength 〉=0.5MPa.The volume of anolyte compartment (A) and cathode compartment (B) is 25cm 3All place thickness and be the carbon felt of 0.5cm in anolyte compartment (A) and cathode compartment (B) as electrode, area is 2.5 * 2.5cm.Connect with titanium silk, wire and the external resistance (5) of Ω of being connected between anode (1) and negative electrode (3).
Embodiment two: device operation
After the device installation, abandon supernatant after the bacterium liquid of enrichment culture is centrifugal, add anolyte compartment (A) after the inoculum mixing of bacterial sediment and new configuration, add again at last cupric sulfide; Cathode compartment (B) solution is the 50mM Tripotassium iron hexacyanide and 50mM K 2HPO 4In anolyte compartment (A), Fe 2+ Acidithiobacillus ferrooxidans(4) be oxidized to Fe under effect 3+, cupric sulfide and Fe 3+Chemical reaction occurs obtain Cu 2+, Fe 2+And simple substance S.The anolyte compartment (A) of sealing keeps anaerobic environment, and simple substance S can't be further oxidized, therefore elemental sulfur is reclaimed, and has also avoided simultaneously the generation of harmful sulphur oxidation products (as vitriol).Fe 2+Be oxidized to Fe 3+The electronics that produces is delivered to negative electrode (3) by anode (1), and in cathode compartment (B), the Tripotassium iron hexacyanide is electron acceptor(EA).
In the device implementation process, the bioelectrochemistry leaching Cu of system 2+Speed be 199.2mg L -1d -1Analyze anodic deposition by X-ray diffraction method, find to have simple substance S to exist; The power density of bioelectrochemistry system is 10.2mW m -3

Claims (4)

1. one kind is used for the bioelectrochemistry system that copper-sulphide ores leaches, and this system realizes synchronously soaking the ore deposit, reclaims elemental sulfur and electrogenesis, it is characterized in that:
(a) cationic exchange membrane (2) is divided into anolyte compartment (A) and cathode compartment (B) with device, and anolyte compartment (A) and cathode compartment (B) are respectively the anaerobic and aerobic environment;
(b) Fe in anolyte compartment (A) 2+Soaking the ore deposit bacterium Acidithiobacillus ferrooxidans(4) be oxidized to Fe under effect 3+, cupric sulfide and oxidation products Fe 3+React and obtain Cu 2+And simple substance S, and generate Fe 2+Re-use for soaking the ore deposit bacterium;
(c) in the bioelectrochemistry system, electronics is delivered to negative electrode (3) from anode (1), and the transmission of electronics promotes Fe 2+Be oxidized to Fe 3+, indirectly promoted Cu 2+Leaching.
2. a kind of bioelectrochemistry system that leaches for copper-sulphide ores according to claim 1, this system realizes synchronously soaking the ore deposit, reclaims elemental sulfur and electrogenesis, it is characterized in that, used soak the ore deposit bacterium for have a liking for acid oxidase ferrous iron thiobacillus ( Acidithiobacillus ferrooxidans) (4), the growth of its optimization and electrogenesis condition are temperature 28-32 oC, pH value 1.8-2.5.
3. a kind of bioelectrochemistry system that leaches for copper-sulphide ores according to claim 1, this system realizes synchronously soaking the ore deposit, reclaims elemental sulfur and electrogenesis, it is characterized in that, soaks the ore deposit bacterium culture medium with Cl in anolyte compartment (A) -Be Main Anions, FeCl 24H 2O is electron donor.
4. a kind of bioelectrochemistry system for the copper-sulphide ores leaching according to claim 1, is characterized in that, anolyte compartment (A) and the interior electrode of cathode compartment (B) are the carbon felt of thickness 0.3-0.8cm; Be connected 5 with the titanium silk with external circuit between anode (1) and negative electrode (3)) connect.
CN2013100635984A 2013-02-28 2013-02-28 Bio-electrochemical system used for copper sulfide ore leaching Pending CN103131856A (en)

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CN105070937A (en) * 2015-07-15 2015-11-18 江南大学 Method for recycling ferric sulphide-containing tailings
CN105483375A (en) * 2015-12-11 2016-04-13 上海第二工业大学 Method for improving efficiency of microbiologically leaching copper in printed circuit board by using NCNTs modified carbon rod electrode
CN105506281A (en) * 2015-12-11 2016-04-20 上海第二工业大学 Method for improving efficiency for microbiologically leaching copper in printed circuit boards by adopting carbon cloth electrode modified by NCNTs
CN105886774A (en) * 2016-04-12 2016-08-24 上海第二工业大学 Method for improving microbiological leaching efficiency of metallic copper in waste printed circuit boards through graphite-modified carbon stick electrode system
CN108239703A (en) * 2016-12-23 2018-07-03 北京有色金属研究总院 A kind of electrochemical method and equipment for controlling bioleaching process
CN108588414A (en) * 2018-05-02 2018-09-28 江南大学 A kind of device for synchronous recycling metal and elemental sulfur
CN108642091A (en) * 2018-05-02 2018-10-12 江南大学 A kind of method of synchronous recycling metal and elemental sulfur
CN108660314A (en) * 2018-05-02 2018-10-16 江南大学 The method that one-step method recycles metal
CN108677008A (en) * 2018-05-02 2018-10-19 江南大学 A kind of device for recycling metal
CN112080637A (en) * 2020-08-24 2020-12-15 中国科学院微生物研究所 Photoelectric energy method for promoting microbial Ar-4 biological metallurgy leaching rate

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105070937B (en) * 2015-07-15 2017-12-12 江南大学 The method of Containing Sulfur iron tailings recycling
CN105070937A (en) * 2015-07-15 2015-11-18 江南大学 Method for recycling ferric sulphide-containing tailings
CN105483375A (en) * 2015-12-11 2016-04-13 上海第二工业大学 Method for improving efficiency of microbiologically leaching copper in printed circuit board by using NCNTs modified carbon rod electrode
CN105506281A (en) * 2015-12-11 2016-04-20 上海第二工业大学 Method for improving efficiency for microbiologically leaching copper in printed circuit boards by adopting carbon cloth electrode modified by NCNTs
CN105886774A (en) * 2016-04-12 2016-08-24 上海第二工业大学 Method for improving microbiological leaching efficiency of metallic copper in waste printed circuit boards through graphite-modified carbon stick electrode system
CN108239703B (en) * 2016-12-23 2019-09-03 有研工程技术研究院有限公司 A kind of electrochemical method and equipment controlling bioleaching process
CN108239703A (en) * 2016-12-23 2018-07-03 北京有色金属研究总院 A kind of electrochemical method and equipment for controlling bioleaching process
CN108588414A (en) * 2018-05-02 2018-09-28 江南大学 A kind of device for synchronous recycling metal and elemental sulfur
CN108660314A (en) * 2018-05-02 2018-10-16 江南大学 The method that one-step method recycles metal
CN108677008A (en) * 2018-05-02 2018-10-19 江南大学 A kind of device for recycling metal
CN108642091A (en) * 2018-05-02 2018-10-12 江南大学 A kind of method of synchronous recycling metal and elemental sulfur
CN108588414B (en) * 2018-05-02 2019-11-26 江南大学 A kind of device for synchronous recycling metal and elemental sulfur
US10886551B2 (en) * 2018-05-02 2021-01-05 Jiangnan University Method for synchronously recovering metal and elemental sulfur
CN112080637A (en) * 2020-08-24 2020-12-15 中国科学院微生物研究所 Photoelectric energy method for promoting microbial Ar-4 biological metallurgy leaching rate

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Application publication date: 20130605