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Method for leaching chalcopyrite through reinforced iron oxidized culture

A technology of bacterial leaching and chalcopyrite, applied in the direction of improving process efficiency, can solve the problems of aggravating the passivation effect of jarosite, hindering continuous adhesion, low cell culture efficiency, etc., and achieves shortening passivation time, The effect of reducing carry-in and increasing cell concentration

Active Publication Date: 2016-01-20
JIANGNAN UNIV
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Problems solved by technology

However, the conventional culture and leaching process is also prone to produce jarosite precipitation, which has a dense structure and will cover the surface of the ore, hindering the continuous attachment of the attached cells of the bacteria to the surface of the ore, thereby reducing the leaching efficiency
Especially in the conventional continuous leaching process, the leaching solution is usually returned to the leaching system. As the leaching time prolongs, the introduced jarosite precipitation will also accumulate, which intensifies the passivation effect of the jarosite, which is not conducive to brass ore leaching
In addition, since most of these bacteria are chemoautotrophic, the efficiency of cell culture is low, and the delay period in the early stage of the leaching process is too long and other problems need to be solved

Method used

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  • Method for leaching chalcopyrite through reinforced iron oxidized culture
  • Method for leaching chalcopyrite through reinforced iron oxidized culture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 High-density cultivation of Thiobacillus ferrooxidans and cell collection without jarosite

[0021] 9K-chalcopyrite compound basal medium: (NH 4 ) 2 SO 4 3.0g, KCl0.1g, K 2 HPO 4 0.5g, MgSO 4 ·7H 2 O0.5g, Ca(NO 3 ) 2 0.01g, H 2 O700mL; Part II: Fe 2 (SO 4 ) 3 ·7H 2 O44.3g, H 2 O300mL. The third part is 0.1% (w / v) lean chalcopyrite. 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 2+ When it is lower than 5g / L, add ferrous sulfate and add 2mL of 9K basal medium at the same time to control the Fe 2+ Maintained at about 7g / L, after 8 feedings, the culture process ended when the bacterial concentration showed a downward trend again. The main parameters of this culture method compared with the control system are shown in Table 1. Biomass from conventional batch culture of 1.4 × 10 8 Individuals / mL increased to 6.2×10 8per mL,...

Embodiment 2

[0024] Embodiment 2 inoculates cells that do not contain jarosite precipitation, and appropriately increases the inoculum size

[0025] Using 9K basal medium (recipe: (NH 4 ) 2 SO 4 3.0g, KCl0.1g, K 2 HPO 4 0.5g, MgSO 4 ·7H 2 O0.5g, Ca(NO 3 ) 2 0.01g, H 2 (21000mL), control pulp concentration is 3.0%, 30 ℃ of temperature, shaker rotating speed 170rpm, control initial cell approximately 5.0 * 10 by inoculation 7 individual / mL. After leaching for 30 days, the leaching results are shown in Table 2. The concentration of copper ions in the leaching system without accessing jarosite-containing cells and appropriately increasing the inoculation amount increased from 32.5 mg / L to 37.1 mg / L. Continue to increase the inoculation amount, and the final leaching rate does not change much. Considering the saving of cell amount, 5.0×10 cells without jarosite were used. 7 individual / mL. Because jarosite covers the surface of the ore, it hinders the adhesion of the attached cells ...

Embodiment 3

[0028] Example 3 Appropriate supplementation of ferrous ions in the early stage of leaching shortens the lag period

[0029] During the inoculation process of the leaching system, 1.0 g / L of ferrous ions were added (the inoculum size was 5.0×10 7 Individual / mL, other steps are consistent with embodiment 2), the key parameter and the leaching result of the thalline growth of leaching process are as shown in table 3. Maximum specific growth rate changed from 0.45d -1 Improve to 0.53d -1 , and the time required to reach the maximum value is reduced from 10.0d to 8.5d. The final copper ion concentration has also been improved to a certain extent (as shown in Table 3). The results indicated that due to the low ore dissolution efficiency in the early stage of leaching, the strains were not adapted to the relatively poor nutrient environment in the environment after inoculation, and the lag period was relatively long. Adding an appropriate amount of ferrous ions can accelerate th...

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Abstract

The invention discloses a method for leaching chalcopyrite through a reinforced iron oxidized culture and belongs to the technical field of bioleaching. The method includes the steps that on the basis of a 9K-chalcopyrite complex medium, a ferrous energy substrate is added through an impulse type supplementary material in the middle and later periods of cultivation, and ferric oxide thiobacillus is cultured at high density; centrifugal operation and suspended elution cells of the 9K medium are adopted for removing jarosite, the cells not containing jarosite are adopted for inoculation, the inoculation size is increased properly, and meanwhile ferrous ions are supplemented and included to shorten a lag phase; and the pH of lixivium is lowered level by level in the later leaching period, accumulation of the jarosite is reduced, and the leaching effect of the chalcopyrite is improved in the whole process. By the adoption of the method, the iron oxidized culture can be more efficiently cultured, the lag phase can be shortened, the passivation effect caused by accumulation of the jarosite can be weakened, the leaching process of the chalcopyrite is improved while iron metabolism is reinforced, operation is easy and feasible, and the method is suitable for being applied and popularized on a large scale.

Description

technical field [0001] The invention relates to a method for enhancing the leaching of chalcopyrite by iron-oxidizing bacteria and belongs to the technical field of biological leaching. Background technique [0002] With the depletion of high-grade copper ores, how to use low-grade copper-bearing ores more efficiently and rationally has attracted more and more attention from researchers, among which chalcopyrite is the most obvious. Chalcopyrite is the most abundant copper ore resource, but its grade is usually low and its structure is complex, so it is difficult to realize its economic value by conventional high-temperature smelting. Bioleaching uses microorganisms as the medium and leachate as the carrier to accelerate the dissolution of copper ions through a series of oxidation-reduction reactions, and finally obtain a better leaching effect. This technology has been recognized by researchers for its advantages of low infrastructure investment, low operation requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 冯守帅杨海麟辛瑜夏小乐张玲
Owner JIANGNAN UNIV
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