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Method for promoting chalcopyrite bio-leaching based on iron-sulfur metabolism regulation

A technology of bioleaching and chalcopyrite, applied in the field of bioengineering, can solve the problems of unsuitability for large-scale popularization and application, poor effect, complicated operation means, etc., and achieves low equipment requirements, simple and easy operation, and promotes ion circulation. Effect

Active Publication Date: 2019-01-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing research, the application method of using external source regulation to promote bioleaching is complicated, the effect is not good, and it is not suitable for large-scale application

Method used

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  • Method for promoting chalcopyrite bio-leaching based on iron-sulfur metabolism regulation
  • Method for promoting chalcopyrite bio-leaching based on iron-sulfur metabolism regulation
  • Method for promoting chalcopyrite bio-leaching based on iron-sulfur metabolism regulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Accumulation of bacterial body weight in the bioleaching process of acidophilus thermophilic Thiobacillus

[0019] Starkey complex medium consists of three parts: the first part contains (NH 4 ) 2 SO 4 0.3g, KH 2 PO 4 3.0g, MgSO 4 ·7H 2 O 0.5g, CaCl 2 0.25g, Fe 2 (SO 4 ) 3 ·7H 2 O 0.018g, H 2 O 1000mL; second part: elemental sulfur 5g / L; third part 2% (w / v) lean chalcopyrite. The pH was adjusted to 1.5 after the first and second parts were mixed aseptically. The ore samples were taken from the Tonglingshan mining area in Anhui Province. After preliminary crushing and filtration with steel sieves, the ore particle size is about <48μm. The first part is sterilized at 121°C for 20 minutes by autoclaving. Then the three parts were mixed and shaken, and the pH of the solution was adjusted to 1.5 with 2 mol / L hydrochloric acid. The thermophilic Thiobacillus acidophilus was inoculated into the Starkey compound basal medium for cultivation, the culti...

Embodiment 2

[0020] Example 2 Optimization of Iron Metabolism in Chalcopyrite Leached by Thiobacillus Acidophilus

[0021] As shown in Table 1, by adding Fe at the initial stage of leaching 3+ (FeCl 3 Form), strengthen the oxidation of oxidant to chalcopyrite, so the copper ions in chalcopyrite in the initial stage of bioleaching can be released into the leach solution quickly. By adding Fe 2+ (FeSO 4 Form), control Fe 3+ and Fe 2+ At the initial ratio of leaching, the oxidation-reduction potential in the leaching solution is reduced, the reduction reaction is promoted, the iron metabolism in the leaching solution is accelerated, and the oxidation efficiency of sulfur is driven. The sulfate ion in Table 1 also proves that the additional addition of A system with a certain proportion of iron has a more active sulfur metabolism. and a certain amount of Fe 2+ Can catalyze the conversion of chalcopyrite into easily leached chalcocite (Cu 2 S). The final leaching rate of copper ions re...

Embodiment 3

[0026] Example 3 Optimization of Sulfur Metabolism in Leaching Depleted Chalcopyrite by Thiobacillus acidophilus

[0027] Scanning electron microscope (SEM) was used to observe the changes of slag surface morphology during the leaching process of chalcopyrite by Thiobacillus acidophilus under different leaching conditions. From figure 1 In a, it can be seen that the slag surface in the blank control without adding other substances during the leaching process is relatively smooth, and the corrosion marks are not obvious, but elemental sulfur and some other derivative particles appear, suggesting that the ion circulation on the chalcopyrite surface is not active. Add 2g / L Fe initially when leaching 3+ and 0.66g / L Fe 2+ when, from figure 1 In b, it can be seen that the dense passivation film in the system may be related to the imbalance of various biochemical reactions in the leaching environment, causing a large amount of elemental sulfur and jarosite to accumulate on the min...

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Abstract

The invention discloses a method for improving efficiency of leaching chalcopyrite from thiobacillus and belongs to the technical field of bioengineering. According to the method disclosed by the invention, on the basis of an improved Starkey-chalcopyrite composite culture medium, iron ions and ferrous ions are supplemented at the initial stage of culture and elemental sulfur is added at stages inthe bio-leaching process, various biochemical reactions in the leaching environment are regulated, chemical and biological factors in the bio-leaching process are enhanced, iron metabolism is promoted while sulfur metabolism is improved, and production of sulfur passivation films and iron passivation films is reduced, so that the leaching rate is improved. The method is simple and feasible in operation, and is applicable to large-scale popularization and application of similar bio-leaching processes.

Description

technical field [0001] The invention relates to a method for promoting chalcopyrite bioleaching based on iron-sulfur metabolism regulation and control, and belongs to the field of bioengineering. Background technique [0002] Most of the world's copper resources are stored in chalcopyrite (CuFeS 2 ), with the gradual decline of chalcopyrite concentrate reserves, the extraction of metallic copper from lean ore, waste ore and tailings has become an inevitable trend of development. However, because low-grade chalcopyrite contains more impurities, the use of traditional metal smelting methods is bound to be accompanied by problems such as large pollution and high energy consumption. And because chalcopyrite has high lattice energy, the method of using acid leaching is very slow, so it is subject to certain restrictions. [0003] Microbial leaching of chalcopyrite is a new type of hydrometallurgical technology. Compared with traditional pyrometallurgy technology, bioleaching of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0084Y02P10/20
Inventor 冯守帅杨海麟黄壮壮尹宗伟侯少翔
Owner JIANGNAN UNIV
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