CN104531992A - Application of ferric phosphate for reinforcement of bacterial leaching out of nickel sulphide ores - Google Patents

Application of ferric phosphate for reinforcement of bacterial leaching out of nickel sulphide ores Download PDF

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Publication number
CN104531992A
CN104531992A CN201410808980.8A CN201410808980A CN104531992A CN 104531992 A CN104531992 A CN 104531992A CN 201410808980 A CN201410808980 A CN 201410808980A CN 104531992 A CN104531992 A CN 104531992A
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China
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leaching
application method
sulphide ores
nickel sulphide
ferric phosphate
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CN104531992B (en
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李骞
杨永斌
姜涛
邱冠周
赖慧敏
徐斌
范晓慧
李光辉
郭宇峰
陈许玲
张元波
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Central South University
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Central South University
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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 provides an application method of ferric phosphate for reinforcement of bacterial leaching of nickel sulphide ores, wherein the dosage of ferric phosphate is 0.2-0.6g/L; under the action of ferric phosphate, the leaching rate of the bacterial leaching out of the nickel sulphide ores is greatly increased and is more than 95%, and moreover, the oxidation time is greatly shortened; phosphoric acid in ferric phosphate provides the nutritive phosphorus needed by bacteria and reinforces the activity and ore leaching function of the bacteria, and moreover, Fe(III) released from ferric phosphate due to bacterial oxidation and Fe(II) in solution form a high redox couple, thus promoting the oxidative decomposition of the nickel sulphide ores, and Fe(II) and S generated by the decomposition enables the energy of bacterial growth and reproduction to further reinforce the leaching of the nickel sulphide ores, thus promoting the speed of the bacterial leaching out of the nickel sulphide ores, and providing important theoretical and technical guidance for the reinforcement of the bacterial leaching of the nickel sulphide ores.

Description

The application of tertiary iron phosphate in strengthening Bioleaching nickel sulfide ore
Technical field
The invention belongs to biological metallurgy field, relating to tertiary iron phosphate strengthening the application method in Bioleaching nickel sulfide ore, realizing the efficient leaching of bacterium to nickel sulfide ore, thus create favorable conditions for low-grade nickel sulfide ore carries nickel.
Background technology
Nickel is not only a kind of Mineral resources ensureing Economic development, and is a kind of important strategic reserves resource.In China, along with the exploitation of nickelous sulfide, the grade of nickel is more and more lower, also more and more difficult, and cause China's nickel resources supply critical shortage, external dependence degree is higher, has become " bottleneck " of the follow-up related industries development of restriction.Low-grade complex nickel sulfide ore uses conventional methods process, and not only the rate of recovery is low, and cost is high, complex process, energy consumption are large, economic benefit is not satisfactory, and the slag produced and waste water are difficult to process, serious environment pollution.Therefore, urgent need develops novel process that is a kind of economy, effective, clean, Sustainable development and new technology.Biohydrometallurgy technology has that technique is simple, less investment, cost are low, reaction temperature and, higher, the clean feature of economic benefit, and can low-grade, difficult Mineral resources of effective exploitation and become the focus of field of metallurgy research.Nearly decades, biological metallurgy technology has had in the leaching of sulphide ores to be studied widely, and successfully obtains industrial application, as the drum culture, Dexing copper mine, Zijin Mining etc. of China.Visible, utilize biological metallurgy technology to process low-grade refractory sulfide, especially nickel sulfide ore aspect has broad prospects.
Current Leaching by Bacteria nickel has certain progress, but yet there are no industrial application report, and problem is mainly slow in Bioleaching nickel sulfide ore speed and leaching yield is low, therefore, strengthening Bioleaching is containing Ni sulphide mine, and finding the method for Strengthen education, will be realize industrialized key.
The leaching velocity that there are some researches show metalliferous mineral and the concentration leaching bacterium in medium are directly proportional, and want the metal ion in Rapid Leaching mineral, then must ensure that rapid growth of bacteria is bred.One of essential condition of accomplishing this point is that supply bacterial growth breeds enough nutrition.Phosphoric acid salt is a kind of component in Nucleotide and derivative, phosphatide, some enzyme and energy metabolism, is that microbial growth is necessary.Test proves, under the well-off condition of other nutritive ingredients, the phosphoric acid salt of suitable concentration is the necessary factor of leaching rate.In addition, research shows that adding specific inorganic salt, metal ion and negatively charged ion, tensio-active agent, catalyzer etc. in Microorganism Leaching system can accelerate the oxygenolysis of microorganism to mineral.As added appropriate Ag +, Co 2+, Hg 2+, Bi 3+in Microorganism Leaching chalcopyrite system, there is promoter action; In addition, also can accelerate Microorganism Leaching sulphide ores by the medium potential controlling ore pulp, the current potential of medium depends on Fe 3+/ Fe 2+concentration, its to leaching most important.Electrostatic potential containing Ni sulphide mine is all higher, so high pulp potential is conducive to the oxygenolysis containing Ni sulphide mine.Therefore, how to improve dissolve medium current potential and continue to provide bacterium desired nutritional source to be the key accelerating Bioleaching nickel sulfide ore.
Based on the inefficient problem of current Bioleaching nickel sulfide ore, special proposition the present invention.
Summary of the invention
The object of this invention is to provide the application method of a kind of tertiary iron phosphate in strengthening Bioleaching nickel sulfide ore, solve Bioleaching nickel sulfide ore leaching cycle and the low problem of leaching yield, the Efficient Development for nickel sulfide ore utilizes and provides technical director.
In order to realize above object, technical scheme of the present invention is:
The application method of tertiary iron phosphate in strengthening Bioleaching nickel sulfide ore: add a tertiary iron phosphate during at Bioleaching nickel sulfide ore, chemical molecular formula is FePO 4.
In aforesaid method, the consumption of tertiary iron phosphate in Leaching Systems is preferably 0.2g/L ~ 0.6g/L.
Ore pulp mass concentration when aforesaid method leaches is 1-20%.
After aforesaid method inoculation, in Leaching Systems, the number of bacterium reaches 10 5 ~ 9individual/mL.
The bacterium of aforesaid method inoculation is preferably Acidithiobacillus ferrooxidans.
Aforesaid method leaches the substratum for lacking phosphorus of nickel sulfide ore.Be preferably the 9K substratum lacking phosphorus.
The 9K substratum moiety lacking phosphorus is: (NH 4) 2sO 4(3g/L), KCl (0.1g/L), MgSO 47H 2o (0.5g/L), Ca (NO 3) 2(0.01g/L), Fe in solution 2+concentration is 9g/L.
Aforesaid method leaching process temperature 28-32 DEG C, vibrator rotating speed 120-180r/min, leach at least 12 days.Preferred leaching process temperature 30 DEG C, vibrator rotating speed 150r/min, leaches 12 days.
Method of the present invention significantly can shorten the microbial leaching cycle and improve leaching yield, and leach after 12 days, the leaching yield of nickel can reach more than 95%.Phosphoric acid on the one hand in tertiary iron phosphate can provide the nutrition needed for bacterium, bacterial growth can be promoted to breed thus the activity of strengthening bacterium and leaching ore deposit function; High redox potential is formed by the Fe (III) that bacterial oxidation discharges with the Fe (II) in medium on the other hand in tertiary iron phosphate, improve ore pulp reduction potential, thus promote the oxygenolysis of nickel sulfide ore, the Fe (II) and the S that decompose generation are the energy that bacterial growth is bred, the leaching of strengthening nickel sulfide ore further.The leaching rate of bacterium to nickel sulfide ore is accelerated under effect in tertiary iron phosphate two, therefore, the measure that the method will be nickel leaching yield in a kind of effective raising Bioleaching nickel sulfide ore system.
Embodiment
The present invention is further illustrated below in conjunction with embodiment, and unrestricted the present invention.
Material condition:
Nickel sulfide ore: nickel sulfide ore nickel grade is 2.47%, mainly exists with nickelous sulfide form;
Other condition: first configure the scarce phosphorus 9K substratum that initial pH is 1.6, the nickel sulfide ore then adding certain mass carries out sterilizing, and ore pulp mass concentration reaches 1-20%, (molecular formula is FePO to add the tertiary iron phosphate of 0.2 ~ 0.6g/L after sterilizing 4), (after inoculation, the quantity of bacterium reaches 10 finally to inoculate 10ml Acidithiobacillus ferrooxidans (A.f bacterium) 8 ~ 9individual/ml).
Embodiment 1: add 100mL and lack phosphorus 9K culture medium solution in 250mL Erlenmeyer flask, then the nickel sulfide ore adding certain mass carries out sterilizing, ore pulp mass concentration reaches 1%, the tertiary iron phosphate of 0.2g/L is added after sterilizing, finally inoculate 10ml Acidithiobacillus ferrooxidans (A.f bacterium), after inoculation, the quantity of bacterium reaches 10 8individual/ml.30 DEG C of constant temperature culture in airbath vibrator, vibrator rotating speed 150r/min, leached after 12 days, and the leaching rate of nickel is not additivated 1.31 times, and leaching yield reaches 74.58%.
Embodiment 2: add 100mL and lack phosphorus 9K culture medium solution in 250mL Erlenmeyer flask, then the nickel sulfide ore adding certain mass carries out sterilizing, ore pulp mass concentration reaches 1%, the tertiary iron phosphate of 0.3g/L is added after sterilizing, finally inoculate 10ml Acidithiobacillus ferrooxidans (A.f bacterium), after inoculation, the quantity of bacterium reaches 10 8individual/ml.30 DEG C of constant temperature culture in airbath vibrator, vibrator rotating speed 150r/min, leached after 12 days, and the leaching rate of nickel is not additivated 1.45 times, and leaching yield reaches 82.55%.
Embodiment 3: add 100mL and lack phosphorus 9K culture medium solution in 250mL Erlenmeyer flask, then the nickel sulfide ore adding certain mass carries out sterilizing, ore pulp mass concentration reaches 1%, the tertiary iron phosphate of 0.4g/L is added after sterilizing, finally inoculate 10ml Acidithiobacillus ferrooxidans (A.f bacterium), after inoculation, the quantity of bacterium reaches 10 8individual/ml.30 DEG C of constant temperature culture in airbath vibrator, vibrator rotating speed 150r/min, leached after 12 days, and the leaching rate of nickel is not additivated 1.68 times, and leaching yield reaches 95.64%.
Reference examples: add 100mL 9K culture medium solution in 250mL Erlenmeyer flask, then the nickel sulfide ore adding certain mass carries out sterilizing, ore pulp mass concentration reaches 1%, finally inoculates 10ml Acidithiobacillus ferrooxidans (A.f bacterium), and after inoculation, the quantity of bacterium reaches 10 8individual/ml.30 DEG C of constant temperature culture in airbath vibrator, vibrator rotating speed 150r/min, leach after 12 days, the leaching yield of nickel is 56.93%.

Claims (10)

1. the application method of tertiary iron phosphate in strengthening Bioleaching nickel sulfide ore, is characterized in that: add tertiary iron phosphate when Bioleaching nickel sulfide ore, chemical molecular formula is FePO 4.
2. application method according to claim 1, is characterized in that: the consumption of tertiary iron phosphate in Leaching Systems is 0.2g/L ~ 0.6g/L.
3. application method according to claim 1, is characterized in that: ore pulp mass concentration during leaching is 1-20%.
4. the application method according to claim 1 or 2 or 3, is characterized in that: after inoculation, in Leaching Systems, the number of bacterium reaches 10 5 ~ 9individual/mL.
5. application method according to claim 1, is characterized in that: the bacterium of inoculation is Acidithiobacillus ferrooxidans.
6. application method according to claim 1, is characterized in that, leaches the substratum for lacking phosphorus of nickel sulfide ore.
7. application method according to claim 6, is characterized in that, leaches the 9K substratum for lacking phosphorus of nickel sulfide ore.
8. application method according to claim 7, is characterized in that, the 9K substratum moiety lacking phosphorus is: (NH 4) 2sO 4(3g/L), KCl (0.1g/L), MgSO 47H 2o (0.5g/L), Ca (NO 3) 2(0.01g/L), Fe in solution 2+concentration is 9g/L.
9. application method according to claim 1, is characterized in that: leaching process temperature 28-32 DEG C, vibrator rotating speed 120-180r/min, leaches at least 12 days.
10. application method according to claim 9, is characterized in that: leaching process temperature 30 DEG C, vibrator rotating speed 150r/min, leaches 12 days.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN106987728A (en) * 2017-03-28 2017-07-28 中南大学 A kind of normal pressure phosphoric acid from lateritic nickel ore leaches nickel cobalt and the method for synchronously preparing ferric phosphate
CN108998666A (en) * 2018-07-27 2018-12-14 中南大学 A method of soaking gold from arsenic-containing gold ore

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CN108998666A (en) * 2018-07-27 2018-12-14 中南大学 A method of soaking gold from arsenic-containing gold ore

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