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Method for strengthening copper blue bioleaching by comprehensively utilizing ferric ions and ferrous ions

A ferrous ion and ferric iron technology, applied in the field of new bioleaching, can solve the problems of increasing the cost of chalcocite bioleaching, not conducive to the growth of iron-oxidizing bacteria, and affecting the leaching efficiency, so as to improve the leaching efficiency and increase the reaction rate. Effect of surface area and reaction cost reduction

Active Publication Date: 2021-02-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the effective high temperature range of 75-100°C selected by the researchers, although there are thermophilic strains suitable for this temperature range, it is difficult to achieve this condition in the practice of some bioheap leaching sites
The addition of a large amount of high-valent iron oxidant not only increases the cost of chalcocite bioleaching, but also is not conducive to the growth of iron-oxidizing bacteria in the system, thus affecting the improvement of leaching efficiency to a certain extent.
Before the bacterial concentration in the sulfuric acid bioleaching system reached the log phase, the Fe 3+ The concentration will drop sharply in a short period of time, and the sulfur layer deposited layer by layer on the chalcocite surface also largely limits the Fe 3+ Diffusion process of unreacted minerals to the inner layer

Method used

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  • Method for strengthening copper blue bioleaching by comprehensively utilizing ferric ions and ferrous ions
  • Method for strengthening copper blue bioleaching by comprehensively utilizing ferric ions and ferrous ions
  • Method for strengthening copper blue bioleaching by comprehensively utilizing ferric ions and ferrous ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Design a leaching experiment with bacterial copper blue to explore the enhanced leaching of copper blue by adding ferric iron (ion concentration 0.1M) and reacting with sulfur-oxidizing bacteria at medium temperature (45°C-318K) process.

[0080] (2) In the shake flask leaching experiment, the leaching liquid adopts the formula of OK medium: (NH 4 ) 2 SO 4 3.0g / L, KC1 0.1g / L, K 2 HPO 4 0.5g / L, MgSO 4 ·7H 2 O 0.5g / L, Ca(NO 3 ) 2 0.01g / L; use dilute sulfuric acid solution to control the pH value within the range of 1.7-2.0. Fully dissolve 2g Fe per 100ml leach solution 2 (SO 4 ) 3 On the first day of the reaction, inoculate medium thermophilic sulfur-oxidizing bacteria (Acidithiobacillus caldus) at first, and inoculate 5ml per 100ml of leach solution with a concentration of 10 9 cell / ml bacterial solution, after 3-5 days of reaction, all the ferric iron is converted into ferrous iron, then add iron-oxidizing bacteria, the leaching of copper ions in the ...

Embodiment 2

[0084] (1) Design a leaching experiment with bacterial copper blue to explore the enhanced leaching of copper blue by adding ferric iron (ion concentration 0.07M) and reacting with sulfur-oxidizing bacteria at medium temperature (45°C-318K) process.

[0085] (2) In the shake flask leaching experiment, the leaching liquid adopts the formula of OK medium: (NH 4 ) 2 SO 4 3.0g / L, KC1 0.1g / L, K 2 HPO 4 0.5g / L, MgSO 4 ·7H 2 O 0.5g / L, Ca(NO 3 ) 2 0.01g / L; use dilute sulfuric acid solution to control the pH value within the range of 1.7-2.0. Fully dissolve 1.4g Fe per 100ml leach solution 2 (SO 4 ) 3 On the first day of the reaction, inoculate medium thermophilic sulfur-oxidizing bacteria (Acidithiobacillus caldus) at first, and inoculate 5ml per 100ml of leach solution with a concentration of 10 9 cell / ml bacterial solution, after 3-5 days of reaction, all the ferric iron is converted into ferrous iron, then add iron-oxidizing bacteria, the leaching of copper ions in t...

Embodiment 3

[0089] For the bacterial leaching experiment of copper blue under low temperature (30°C-303K), compared with Example 1, only the temperature is different. After adding ferric iron (ion concentration 0.1M) to react with sulfur oxidizing bacteria, then adding iron oxidizing bacteria to strengthen The process of leaching copper blue, in comparative example 1, under low temperature (30 ℃-303K) reaction conditions, 303K-Fe 3+ Solution Fe in the experimental group 3+ The ion concentration decreased linearly within 12 days of reaction, while Fe 2+ The concentration increases linearly (figure 1 (b)), the copper blue dissolution reaction is slower than that at medium temperature (45°C-318K). Therefore, compared with the medium temperature (45°C-318K) reaction in Example 1, it takes a longer time to reach the final stage of leaching under low temperature (30°C-303K) conditions. Therefore, the conditions in Example 1 are preferred to implement the copper blue bioleaching process.

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Abstract

The invention belongs to the technical field of biological metallurgy, and particularly relates to a method for strengthening copper blue bioleaching by comprehensively utilizing ferric ions and ferrous ions. The method can be used for improving the ore leaching efficiency of low-grade copper sulfide ore. The method specifically comprises the steps that ferric sulfate and sulfur-containing oxidizing bacteria are adopted as a leaching agent for leaching copper blue; and then iron-oxidizing bacteria are added into a leaching system for achieving leaching. According to the method, efficient utilization of an iron source and bacteria is achieved, and the situation that due to addition of exogenous iron, passivated objects such as compact jarosite on the surface of the ore are generated too early, and the reaction rate is limited by a sulfur layer formed on the surface in the reaction process is avoided. The method has important significance in improving the bioleaching efficiency of chalcocite.

Description

Technical field: [0001] The invention belongs to the technical field of biometallurgy, and specifically relates to a novel bioleaching method for promoting the dissolution of refractory secondary sulfide mineral copper blue by means of ferric ions and leaching bacteria, which can be used to improve the leaching efficiency of low-grade copper sulfide ore . Background technique: [0002] Copper blue is the main copper-containing mineral in the second stage of chalcocite leaching, and a large number of studies have proved that the reaction rate in the second stage of chalcocite leaching is slow, which greatly limits the copper extraction efficiency of chalcocite leaching. The researchers' research on the passive film components in the bioleaching process of chalcopyrite and bornite also showed that copper blue is one of the passive film components. [0003] By raising the reaction temperature and increasing the oxidant (Fe 3+ ) content can effectively improve the copper blue ...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0071Y02P10/20
Inventor 王军于世超刘仕统杨宝军廖蕤洪茂鑫邬柏强赵春晓林豪林墨刘玉玲周祎汤安妮张雁生谢建平申丽赵红波甘敏覃文庆邱冠周
Owner CENT SOUTH UNIV
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