CN101736154B - Method for keeping biological activity in biological heap leaching process and improving leaching efficiency - Google Patents
Method for keeping biological activity in biological heap leaching process and improving leaching efficiency Download PDFInfo
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- CN101736154B CN101736154B CN2008102273262A CN200810227326A CN101736154B CN 101736154 B CN101736154 B CN 101736154B CN 2008102273262 A CN2008102273262 A CN 2008102273262A CN 200810227326 A CN200810227326 A CN 200810227326A CN 101736154 B CN101736154 B CN 101736154B
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Abstract
The invention relates to a method for effectively keeping microbiological leaching activity and improving leaching efficiency, which is a quick detection method of the content of organic matters in the raffinate which returns to the stock heap for spraying in the purification process of the raffinate by measuring the surface tension of the raffinate. The method comprises the steps of: removing the organic matters by ultrasonic emulsion breaking, air flotation and fiber ball filtering, and adding sodium sulfide to reduce harmful impurity ions such as high-valent manganese and arsenic and the like in the raffinate, thereby effectively reducing the inhibition of the raffinate on the biological activity to achieve the purposes of keeping the biological activity in the heap leaching process and improving the leaching efficiency. The technical method is suitable for the pretreatment process of the raffinate which returns to the stock heap for spraying, and after the purified raffinate enters the stock heap, the biological oxidation activity can not be influenced, thereby improving the biological leaching efficiency and solving the problem that harmful substances such as organic matters carried in the raffinate have inhibiting effect on the biological activity.
Description
Technical field
The present invention relates in a kind of low-grade copper ore biology heap leaching process, effectively keep microorganism to leach active, as to improve leaching efficiency method.This processing method is applicable to the preprocessing process before the copper raffinate returns the heap spray.
Background technology
In the ore biology heap leaching process, microorganism has katalysis to the dissolving of sulfide mineral, is mainly reflected in: to the erosion of sulfide mineral; With oxidation of divalent is ferric iron, leaches needed high redox potential to keep mineral; The sulfur oxide product is a vitriol, keeps the low pH value of leaching system.Be carrying out smoothly of biological heap leaching process, need microorganism to keep the activity of ferric oxide and sulphur preferably, this just requires to provide and is suitable for the microorganism survival environment, wherein biological activity is had the considerable influence except that temperature, pH value, main nutrient carbon source and dissolved oxygen, because the raffinate after the extraction will return the ore deposit heap and spray, wherein the organism carried secretly of raffinate has bigger restraining effect to microorganism active, therefore, be necessary raffinate is carried out pre-treatment, active to keep microorganism to leach, improve leaching efficiency.For example, in certain copper mine stone biological dump leaching process, because the organism that raffinate is carried secretly accumulation in a large number in the heap of ore deposit causes bacterial number decline in the heap of ore deposit, bacterial oxidation is active obviously to be reduced, thereby causes leaching rate to descend, and influences the copper leaching efficiency.Therefore, have a strong impact on microorganism active at this organism of carrying secretly owing to raffinate, reduce leaching efficiency, be necessary to provide a kind of new raffinate pretreatment technology, effectively reduce the organic content carried secretly in the raffinate, improve its method the active influence of microbiological oxidation.In the biological dump leaching process, raffinate returns the ore deposit heap and sprays operation, owing to carry the organism that biology is had toxic action secretly in the raffinate, it because the organism hydrophobicity is stronger, very easily is adsorbed on mineral surface after entering the ore deposit heap, cause the accumulation in the heap of ore deposit of this type organic for a long time, after this organism was accumulated to certain content, severe inhibition bacterial growth and oxidation activity caused the bacterium leaching efficiency to reduce.Because organic content is difficult to measure in the heap of ore deposit, can come indirect measurement organic content wherein by the surface tension of measuring raffinate, when organic concentration in the raffinate was 5mg/L, redox potential obviously reduced, about decline 100mV, leaching rate is descended; When organic concentration in the raffinate surpasses 10mg/L, bacterium almost can not survive, biological oxidation stops, leaching efficiency is reduced greatly, therefore, must find the method for organic content in a kind of fast and convenient mensuration and the control raffinate, biology be leached active influence with the organism in effective elimination raffinate.
Summary of the invention
The purpose of this invention is to provide in a kind of copper mine stone biological dump leaching process, the method that keeps bacterial activity, raising leaching efficiency, the raffinate that this method is particularly suitable for follow-up extraction process generation returns in the heap spray system of ore deposit, carries the pre-treatment scavenging process of the organic raffinate of a large amount of inhibition bacterial activities secretly.This technology can effectively keep the bacterial oxidation activity, improves the method for leaching efficiency.This implementation of processes can be under the biological leaching system, can effectively improve microorganism active, improves leaching rate, improves biological leaching efficiency, can obtain certain economic benefits and environmental benefit.
For achieving the above object, pretreated method before the present invention takes ore deposit heap spray with the raffinate spray, solve bioleaching process bacterium or the lower problem of property, main contents comprise the following aspects: in copper mine stone biological dump leaching spray system, because the organism that raffinate is carried secretly has a strong impact on the biological activity that leaches, this method is to pass through ultrasonic dehydration, air supporting and fibre-ball filtration technology reduce the organic content that raffinate that extraction process produces is carried secretly, guarantee activity in biological heap leaching process, improve leaching efficiency, biological activity can be estimated by the redox potential that monitoring bio leaches in the heap.When the spray liquid after the processing returns the heap spray, can not influence the microorganism active in the heap, improve leaching efficiency.
Therefore, must find the method for organic content in a kind of fast and convenient mensuration and the control raffinate, biology be leached active influence with the organism in effective elimination raffinate.Can take to come the indirect measurement organic concentration and adopt the method for ultrasonic dehydration, air supporting and fibre-ball filtration to reduce organic content by the capillary method of rapid determination raffinate.
Concrete scheme is as follows:
1. at first draw out the corresponding typical curve of surface tension and organic content, according to the raffinate of preparation concentration known, adopt surface tension instrument to measure its corresponding surface tension, the typical curve that obtains as shown in Figure 1.When organic substrate concentration was 5mg/L, the raffinate surface tension was 58mN/m; When organic substrate concentration was 10mg/L, the raffinate surface tension was 51mN/m, therefore, can take to come the indirect measurement organic content by the capillary method of rapid determination raffinate.
2. in the preprocessing process of raffinate, when organic concentration in the raffinate surpasses 5mg/L, adopt ultrasonic dehydration, air supporting and fibre-ball filtration method to reach and remove organic purpose, thereby reduce organic content in the raffinate.
3. add an amount of lime, control suitable pH value, add an amount of 10～20mg/L sodium sulphite again, detrimental impurity ions such as high price manganese in the reduction raffinate and arsenic, reduce the influence of detrimental impurity ion pair bacterial activity, solve the low problem of biological activity in biological heap leaching process.
Advantage of the present invention is: this processing method is applicable to returns the preprocessing process of ore deposit heap spray with raffinate, after raffinate through purifying enters the ore deposit heap, can not influence the bio-oxidation activity, thereby improved biological leaching efficiency, solved objectionable impuritiess such as carrying organism in the raffinate secretly bioactive inhibition problem.
Description of drawings
Fig. 1 organic concentration and surface tension corresponding relation figure
Fig. 2 is the process flow diagram of a kind of enforcement of the present invention
Embodiment
As shown in Figure 2,1 is organic content process in the rapid detection raffinate, 2,3 and 4 for returning the raffinate pretreatment process of ore deposit heap spray usefulness, mainly comprise the method removal organism that adopts ultrasonic dehydration, air supporting and fibre-ball filtration, adopt and add an amount of sodium sulphite reduction high price detrimental impurity ion, regulating the pH value is 1.2～1.5.Return in the preceding raffinate pretreatment process of ore deposit heap spray, contain the organism raffinate and behind ultrasonic dehydration, enter air-floating apparatus, carry out fibre-ball filtration behind the oil removal by air bubbling.Raffinate behind the removal organism adds sodium sulphite reduction high price detrimental impurity ion (mainly referring to manganese and high price arsenic at high price), and regulates its pH value as required, and raffinate after treatment enters ore deposit heap spray operation.
The invention will be further described below in conjunction with embodiment:
Because in certain copper mine copper mine stone biological dump leaching process, because after raffinate is carried organism secretly and is entered ore deposit heap, because the organism hydrophobicity is stronger, very easily be adsorbed on mineral surface, cause the accumulation in the heap of ore deposit of this type organic for a long time, after this organism is accumulated to certain content, severe inhibition bacterial growth and oxidation activity, cause the bacterium leaching efficiency to reduce, and the high price foreign ion that raffinate is carried secretly (manganese and arsenic) has stronger restraining effect to biological activity, therefore, must carry out pre-treatment to the raffinate that returns the ore deposit heap, organism in the elimination raffinate and foreign ion are to bioactive inhibition.
In the organic content mensuration process, adopt the capillary method of mensuration raffinate to come the indirect measurement organic content in step (1) raffinate, this method is easy fast, by organic content and capillary typical curve, just can find organic content.When organic concentration in the raffinate surpassed 5mg/L, when promptly the raffinate surface tension was lower than 58mN/m, this raffinate needed just can return ore deposit heap sprinkling system through pre-treatment.
Step (2) copper extracts in the surplus liquid preprocessing process, adopts the method for ultrasonic dehydration, air supporting and fibre-ball filtration to remove organism.The form of entrained oil is based on suspension oil and oil in water emulsion in the raffinate, the oil in water emulsion oil bead diameter is less than 10 μ m, when tensio-active agents such as residual extraction agent in the raffinate, oil droplet in the raffinate exists with stable oil in water emulsion form, has only the separation of to float behind the breakdown of emulsion, therefore, need to adopt ultrasonic oscillator that the oil-in-water type organic is parsed from solution, so that remove in the follow-up air supporting process, the ultrasonication frequency of ultrasonic emulsion breaking is under the condition of 40kHz, 5 minutes ultrasound wave irradiation time, behind ultrasonic emulsion breaking, the air-floating apparatus that enters the air dissolved pump pressure air-dissolving makes the organism come-up, enter oil trap through the scraper plate collection, solution after air supporting is handled enters fiber ball filter, and organic content is less than 1mg/L in the solution after handling like this, and the greasy dirt clearance reaches more than 85%.
Add an amount of 10～20mg/L sodium sulphite in the step (3), detrimental impurity ions such as high price manganese in the reduction raffinate and arsenic reduce such detrimental impurity ionic content, thereby avoid it to enter after the leaching system bioactive inhibition.Method by atomic absorption detects the detrimental impurity ionic and changes, and reduces the content of organism and foreign ion in the raffinate by above method, reduces it to the active influence of bio-oxidation, improves biological leaching efficiency.Enter ore deposit heap sprinkling system through pretreated raffinate.
Effect of the present invention is: environmentally friendly, can be used for developing the biological dump leaching technology because raffinate is carried the problems such as biologically active reduction that organic matter brings, Effective Raise leaching efficiency secretly.
Claims (1)
1. method that keeps biological activity in biological heap leaching process, improves leaching efficiency, it is characterized in that: it may further comprise the steps:
(1) adopt the capillary method of mensuration raffinate to come the indirect measurement organic content, by organic content and capillary typical curve, find organic content, described organic content and capillary typical curve are the raffinates according to the preparation concentration known, adopt surface tension instrument to measure that its corresponding surface obtains;
(2) in the raffinate preprocessing process, when organic concentration surpasses 5mg/L in the raffinate that returns ore deposit heap work spray usefulness, need to adopt the method for ultrasonic dehydration, air supporting and fibre-ball filtration that raffinate is carried out pre-treatment, remove organism in the raffinate, organic content is less than 1mg/L in the solution after the processing;
(3) in the raffinate pretreatment process, add an amount of 10～20mg/L sodium sulphite, high price manganese and the arsenic detrimental impurity ion of reduction in the raffinate reduces such detrimental impurity ionic content, thereby avoids it to enter after the leaching system bioactive inhibition.
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| CN2008102273262A CN101736154B (en) | 2008-11-26 | 2008-11-26 | Method for keeping biological activity in biological heap leaching process and improving leaching efficiency |
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| CN101736154B true CN101736154B (en) | 2011-09-07 |
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| CN102634661B (en) * | 2012-04-06 | 2013-08-07 | 中南大学 | Application of additive in enhancing oxidization of arsenical gold mineral by bacteria |
| CN102943177B (en) * | 2012-10-29 | 2014-03-26 | 浙江特力再生资源有限公司 | Method for recovering cooper and silicon powder from organosilicon waste residue |
| CN105565395B (en) * | 2015-11-20 | 2017-07-28 | 厦门紫金矿冶技术有限公司 | A kind of processing method of copper mine raffinate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4069119A (en) * | 1976-05-14 | 1978-01-17 | Continental Oil Company | Copper recovery by leaching and ion exchange |
| SU693980A1 (en) * | 1977-08-02 | 1991-10-30 | Химико-металлургический институт АН КазССР | Method of preparing copper concentrate to pyrrometallurgical treatment |
| CN1101948A (en) * | 1994-06-29 | 1995-04-26 | 四川联合大学 | Method for raising cyaniding extraction rate and recovery percent of carbonaceous gold ore by compound inhibitor |
| WO2002070758A1 (en) * | 2001-03-06 | 2002-09-12 | Bhp Billiton Innovation Pty Ltd | Improved, high yield bioheap leaching of chalcopyrite copper ores |
-
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- 2008-11-26 CN CN2008102273262A patent/CN101736154B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4069119A (en) * | 1976-05-14 | 1978-01-17 | Continental Oil Company | Copper recovery by leaching and ion exchange |
| SU693980A1 (en) * | 1977-08-02 | 1991-10-30 | Химико-металлургический институт АН КазССР | Method of preparing copper concentrate to pyrrometallurgical treatment |
| CN1101948A (en) * | 1994-06-29 | 1995-04-26 | 四川联合大学 | Method for raising cyaniding extraction rate and recovery percent of carbonaceous gold ore by compound inhibitor |
| WO2002070758A1 (en) * | 2001-03-06 | 2002-09-12 | Bhp Billiton Innovation Pty Ltd | Improved, high yield bioheap leaching of chalcopyrite copper ores |
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