CN104404252B - A kind of method utilizing sea water to carry out Bioleaching sulphide ore - Google Patents
A kind of method utilizing sea water to carry out Bioleaching sulphide ore Download PDFInfo
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- CN104404252B CN104404252B CN201410799171.5A CN201410799171A CN104404252B CN 104404252 B CN104404252 B CN 104404252B CN 201410799171 A CN201410799171 A CN 201410799171A CN 104404252 B CN104404252 B CN 104404252B
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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
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Abstract
The invention provides a kind of method utilizing sea water to carry out Bioleaching sulphide ore.Sea water solution pH sulphuric acid after sea water or dilution is adjusted to 1.6～1.8, then adds ferrous sulfate and make Fe2+Concentration reaches 3～5g/L, is added to by the solution prepared in the leaching container of sulfide mine, connects a certain amount of bacterium solution and carries out bacterial leaching in this system.Leaching (oxidation) efficiency of sulphide ore can improve more than 1.7 times, and oxidization time significantly shortens.When using sea water as culture medium Bioleaching sulphide ore, it is possible not only to improve the activity of antibacterial, and soaks the ferrous iron in mineral solution and consume little, generate the autunezite hindering Bioleaching little, therefore, can efficiently strengthen Bioleaching sulphide ore.The method flow process is simple, convenient and environmental-friendly to operate, cost is low, and flow process is short, is suitable for large-scale application.
Description
Technical field
The invention belongs to biological metallurgy field, relate to the method that application sea water carries out Bioleaching sulphide ore, it is achieved the efficient leaching to sulphide ore antibacterial.
Background technology
Mineral resources are to ensure the basis that national economy develops in a healthy way, and along with China's rapid development of economy, the demand of metal are constantly expanded.The links such as the consumption of rapid expansion also existing is adopted, selected, smelting bring pressure in various degree and impact, and then have caused the serious problems of the aspects such as resource, the energy, environment, become the key factor of restriction Chinese society and sustainable economic development.And along with the carrying out of exploitation, rich ore is day by day exhausted, each large-scale mine produces the barren rock of sulfur compound metallic ore, unbalanced-ore, abandoned mine hole, but pile up like a mountain for mine tailing, causes the waste of resource.If, with this part low-grade metal sulphide ore resource good, the tense situation that current china natural resources is under-supply just can be alleviated well.Existing research shows, Bioleaching technology be particularly suitable for processing lean ore, abandoned mine, unbalanced-ore and difficulty is adopted, difficult choosing, the dump leaching in difficult smelting ore deposit and Stope leaching.
The research of Bioleaching starts from the 1950's, and since over half a century, Bioleaching has been carried out substantial amounts of research by many scholars.South Africa low grade nickel ore has been carried out the simulation experiment of bacteria heap leaching by Miller etc., and after leaching 70d, the leaching rate of nickel is 30%～50%.Japan Nakazawa etc. reports employing thiobacillus ferrooxidant and in lower ph (1.0～1.7) condition, Jinchuan low grade nickel ore is leached 42d, can leach the nickel of 75% and the copper of 14%.Ahonent and Tuovinen thiobacillus ferrooxidant and thiobacillus thiooxidant mixed vaccine leach complicated sulfuration mine, essential mineral be Chalkopyrite, containing hengleinite, sphalerite, magnetic iron ore, pyrite can, only have the copper of 2% to be leached when leaching the nickel of 25%.Chen Bowei etc. have studied the bioleaching process mineralogy of certain low-grade villamaninite, investigate inoculum concentration, initial pH, ore grain size, the leaching cycle impact on this ore deposit shaking flask leaching process, account for 90% at ore grain size-0.074mm, pulp density 2%, bacterial load 30%, initial pH1.5, leaching cycle 30 days, shaking speed 150r min-1When, maximum ambrose alloy leaching rate can be obtained, respectively 89.79% and 41.80%.
At present, Bioleaching technology has been successfully applied to the leaching of the leaching of copper mine, uranium ore and the biological pre-oxidation of complicated difficult-treating gold mine.But it is long that Bioleaching sulphide ore there is also the bacterial leaching cycle, the problem that leaching rate is low.Therefore, for Bioleaching sulphide ore, how to accelerate oxidation rate, shorten the leaching ore deposit cycle, be the key promoting this technological progress and productivity's sustainable development.
The cultivation being conventionally used for leaching ore deposit is 9K solution, and constituent is: (NH4)2SO4(3g/L), KCl (0.1g/L), K2HPO4(0.5g/L), MgSO4·7H2O (0.5g/L), Ca (NO3)2(0.01g/L), Fe in solution2+Concentration is 9g/L.Sea water contains abundant nutritional labeling, is mainly composed of: cation Na+(10.62g/L), K+(0.38g/L), Ca2+(0.4g/L), Mg2+(1.28g/L) and Sr2+(13mg/L) five kinds, anion has Cl-(19.10g/L), SO4 2-(2.66g/L), Br-(65mg/L), HCO3 -(152mg/L), F-(1.4mg/L) five kinds, also having other material existed with molecular forms, all elements summation accounts for the 99.9% of sea-water salt, has the mineral of 35,700,000 tons and more than 80 kind of chemical element in the sea water of average every cubic kilometer, and total salt amount is about 3.5%.Therefore, the nutritional labeling contained in sea water is sufficient for cultivating the demand of ore immersion bacterial culture, and the unique component (such as trace element, aminoacid, vitamin etc.) that sea water contains can also strengthen the activity of antibacterial, thus accelerating the ability of bacterial oxidation sulphide ore.Additionally, using microbe leaching ore deposit to consume substantial amounts of water every year and buy substantial amounts of nutritional labeling to cultivate antibacterial, and seawater resources are huge.Therefore, use sea water as culture medium not only can enhancement microbiological activity to reach to improve mineral leaching efficiency, but also cost and freshwater resources can be saved.
The abundant nutrition composition that the problem low for current Bioleaching sulphide ore mineral leaching efficiency and sea water contain, the special proposition present invention.
Summary of the invention
It is an object of the invention to provide a kind of method utilizing sea water to carry out Bioleaching sulphide ore, namely sea water is added when Bioleaching sulphide ore, it is possible not only to improve the activity of antibacterial, and soak the ferrous iron in mineral solution and consume little, generate the autunezite hindering Bioleaching little, therefore, Bioleaching sulphide ore can efficiently be strengthened.The method flow process is simple, convenient and environmental-friendly to operate, cost is low, and flow process is short, is suitable for large-scale application.
In order to realize object above, the technical scheme is that
A kind of method utilizing sea water to carry out Bioleaching sulphide ore, adds sea water when Bioleaching sulphide ore.
Said method is to add after directly adding sea water or it being diluted with fresh water.During dilution, the mass values of fresh water and sea water is 1:1.Said method needs the sea water solution pH value after by sea water or dilution to adjust and add after 1.6～1.8 again.Preferably employ sulphuric acid and adjust pH value.Said method also needs to add ferrous iron in the sea water solution after sea water or dilution, makes Fe2+Concentration is used further to after reaching 3-6g/L leach ore deposit.Preferably add ferrous sulfate, make Fe2+Concentration preferably reaches 5g/L.
In said method, preferably inoculation Acidithiobacillus ferrooxidans leaches sulphide ore.After inoculation, in Leaching Systems, the number of antibacterial reaches 105～9Individual/mL.
Ore pulp mass concentration when preferably leaching in said method is 1-20%.
The method of the present invention is possible not only to improve bacterial activity to strengthen the leaching rate of Bioleaching sulphide ore, and antibacterial is considerably less to ferrous consumption, the autunezite hindering Bioleaching generates considerably less, thus further speeding up the leaching of antibacterial, therefore, utilize this technology especially can carry out Microorganism Leaching near the Sulphur mine on seashore for sulphide ore and a kind of technical guidance is provided.
Sea water after sea water or dilution is added a small amount of ferrous culture medium (Fe of conventional medium as bacterial oxidation sulphide ore by the present invention2+Concentration is 9g/L, i.e. so-called 9K culture medium), owing to sea water contains abundant nutritional labeling, thus the growth for antibacterial provides enough nutritional labeling, possibly even promote some material that can accelerate to soak ore deposit of bacteria gene expression, and containing the energy substance that can provide for antibacterial, thus reducing ferrous use, and then reduce the generation of the autunezite hindering Bioleaching, therefore, the present invention is possible not only to the activity of strengthening antibacterial and accelerates leaching ore deposit speed, and further speed up Bioleaching sulphide ore by reducing the generation of autunezite, important measures are provided for accelerating Bioleaching sulphide ore.
Detailed description of the invention
Following example are further intended to present invention is described, rather than limit the scope of the invention.
Material condition:
A ore deposit: nickel sulfide ore grade is 2.47%, nickel mainly exists with pentlandite form；
B ore deposit: copper-sulphide ores grade is 0.87%, copper mainly exists with Chalkopyrite form；
C ore deposit: sulfur-bearing arsenic gold concentrate, gold grade is 44.3g/t, and sulfur arsenic content reaches 21%.
Sea water takes from coastal waters, Xiamen.
It is mainly composed of: cation Na+(10.62g/L), K+(0.38g/L), Ca2+(0.4g/L), Mg2+(1.28g/L) and Sr2+(13mg/L) five kinds, anion has Cl-(19.10g/L), SO4 2-(2.66g/L), Br-(65mg/L), HCO3 -(152mg/L), F-(1.4mg/L) five kinds, also having other material existed with molecular forms, all elements summation accounts for the 99.9% of sea-water salt.
Embodiment 1: add the 100mL sea water medium not diluted in 250mL conical flask, adjusting medium pH is 1.6, adds 1g nickel sulfide ore (A ore deposit) and 5g/LFe2+, (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the leaching rate of nickel reaches 37%, and after leaching 10 days, the leaching rate of nickel reaches 55.3%, and after leaching 23 days, the leaching rate of nickel reaches 87.5%.
Reference examples 1: add 100mL9K culture medium in 250mL conical flask, adjusting medium pH is 1.6, adding 1g nickel sulfide ore (A ore deposit), (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the leaching rate of nickel reaches 12%, and after leaching 10 days, the leaching rate of nickel reaches 32.5%, and after leaching 23 days, the leaching rate of nickel reaches 67.3%.
Embodiment 2: adding 100mL fresh water in 250mL conical flask and dilute the sea water of a times as culture medium, adjusting medium pH is 1.6, adds 1g nickel sulfide ore (A ore deposit) and 5g/LFe2+, (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the leaching rate of nickel reaches 43%, and after leaching 10 days, the leaching rate of nickel reaches 69%, and after leaching 23 days, the leaching rate of nickel reaches 92.5%.
Embodiment 3: adding 100mL fresh water in 250mL conical flask and dilute the sea water of a times as culture medium, adjusting medium pH is 1.6, adds 1g copper-sulphide ores (B ore deposit) and 5g/LFe2+, (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the leaching rate of copper reaches 21%, and after leaching 10 days, the leaching rate of copper reaches 63.5%, and after leaching 23 days, the leaching rate of copper reaches 85.7%.
Reference examples 2: add 100mL9K culture medium in 250mL conical flask, adjusting medium pH is 1.6, adding 1g copper-sulphide ores (B ore deposit), (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the leaching rate of copper reaches 13%, and after leaching 10 days, the leaching rate of copper reaches 43%, and after leaching 23 days, the leaching rate of copper reaches 71.2%.
Embodiment 4: adding 100mL fresh water in 250mL conical flask and dilute the sea water of a times as culture medium, adjusting medium pH is 1.6, adds 1g sulfur-bearing arsenic gold concentrate (C ore deposit) and 3g/LFe2+, (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the oxygenation efficiency of sulfur arsenic reaches 13%, and after leaching 10 days, the oxygenation efficiency of sulfur arsenic reaches 58%, and after leaching 23 days, the oxygenation efficiency of sulfur arsenic reaches 86%.
Reference examples 3: add 100mL9K culture medium in 250mL conical flask, adjusting medium pH is 1.6, adding 1g sulfur-bearing arsenic gold concentrate (C ore deposit), (quantity of antibacterial reaches 10 then to inoculate the Acidithiobacillus ferrooxidans (A.f bacterium) of 10mL8～9Individual/ml).After 30 DEG C of constant temperature leach container leaching 4 days, the oxygenation efficiency of sulfur arsenic reaches 8%, and after leaching 10 days, the oxygenation efficiency of sulfur arsenic reaches 41.2%, and after leaching 23 days, the oxygenation efficiency of sulfur arsenic reaches 65.9%.
Claims (6)
1. one kind utilizes the method that sea water carries out Bioleaching sulphide ore, it is characterised in that adding the mass values with light water-reducible sea water, fresh water and sea water when Bioleaching sulphide ore is 1:1；Sea water solution after dilution adds ferrous iron, makes Fe2+Concentration reaches 3 6g/L, and inoculation Acidithiobacillus ferrooxidans leaches sulphide ore.
2. method according to claim 1, it is characterised in that the sea water solution pH value after sea water or dilution is adjusted to 1.6～1.8.
3. method according to claim 2, it is characterised in that adopt sulphuric acid to adjust pH value.
4. method according to claim 1, it is characterised in that add ferrous sulfate, make Fe2+Concentration reaches 5g/L.
5. method according to claim 1, it is characterised in that after inoculation, in Leaching Systems, the number of antibacterial reaches 105～9Individual/mL.
6. method according to claim 1, it is characterised in that ore pulp mass concentration during leaching is 1 20%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278069A (en) * | 1992-02-14 | 1994-01-11 | The Israel Electric Corporation Ltd. | Bioleaching method for the extraction of metals from coal fly ash using thiobacillus |
| CN1362528A (en) * | 2001-01-08 | 2002-08-07 | 冶金工业部长春黄金研究院 | Two-section bacteria oxidation process to extract gold |
| WO2002081761A2 (en) * | 2001-04-10 | 2002-10-17 | Billiton Sa Limited | Bioleaching of a sulphide concentrate in a saline solution |
| RU2262543C1 (en) * | 2004-04-29 | 2005-10-20 | Общество с ограниченной ответственностью "НВП Центр-ЭСТАгео" | Method of processing persistent gold-bearing ores, concentrates, middlings, and a reagent for implementation of processing |
| CN101333599A (en) * | 2008-04-30 | 2008-12-31 | 东北大学 | Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5278069A (en) * | 1992-02-14 | 1994-01-11 | The Israel Electric Corporation Ltd. | Bioleaching method for the extraction of metals from coal fly ash using thiobacillus |
| CN1362528A (en) * | 2001-01-08 | 2002-08-07 | 冶金工业部长春黄金研究院 | Two-section bacteria oxidation process to extract gold |
| WO2002081761A2 (en) * | 2001-04-10 | 2002-10-17 | Billiton Sa Limited | Bioleaching of a sulphide concentrate in a saline solution |
| RU2262543C1 (en) * | 2004-04-29 | 2005-10-20 | Общество с ограниченной ответственностью "НВП Центр-ЭСТАгео" | Method of processing persistent gold-bearing ores, concentrates, middlings, and a reagent for implementation of processing |
| CN101333599A (en) * | 2008-04-30 | 2008-12-31 | 东北大学 | Cyanidation aurum-extracting method for preprocessing high-arsenic complex refractory gold ore by oxidation with arsenic resistant strains |
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