Biological metallurgy method and device based on primary battery

A biometallurgy and primary battery technology, applied in the direction of improving process efficiency, can solve the problems of limited concentration, energy loss, limited microbial tolerance, etc., and achieve the effect of reducing operating power consumption, shortening processing cycle, and improving leaching efficiency

Active Publication Date: 2022-08-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the microbial reaction to acid and Fe 3+ Oxidant tolerance is limited, and Fe 3+ When the concentration is high, it will self-precipitate and fail, so the acid and Fe in the bioleaching system 3+ The concentration is limited, which limits the efficient leaching of materials, and the leaching cycle is as long as several weeks to several months
[0005] (2) The extreme environment of bioleaching, including: strong acid, high temperature, high pressure, low dissolved oxygen, high concentration of materials, stirring shear force, toxic ions, etc., will significantly inhibit the growth and metabolism of microorganisms, which seriously affects bioleaching efficiency and limits the scope of application of bioleaching
[0006] (3) A large number of microorganisms in the bioleaching system enter the natural environment uncontrollably, which may cause adverse effects on the ecological environment, especially in the in-situ bioleaching process, microorganisms can easily enter the natural environment and participate in the oxidation of waste rocks and tailings Dissolving process, producing acid mine wastewater and other environmental problems
[0007] (4) The bioleaching process mainly involves electrochemical redox reactions, and a large amount of chemical energy produced is mostly released in the form of waste heat, resulting in a large amount of energy loss, and often requires electricity for cooling
[0008] Therefore, in the current biometallurgical process, the low leaching rate and leaching efficiency, the interaction between microorganisms and the environment, energy recovery and energy consumption reduction, etc. are the bottleneck problems faced by biometallurgical technology breakthroughs and industrial promotion and application.

Method used

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  • Biological metallurgy method and device based on primary battery
  • Biological metallurgy method and device based on primary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The iron concentration of the leaching agent was 0.5 mol / L, the sulfuric acid concentration was 1.5 mol / L, the leaching aid NaCl was 10 g / L, and the sodium lignosulfonate or calcium lignosulfonate was 2 g / L. The microorganism in the bacterial solution was Thiobacillus ferrooxidans acidophilus, the iron ion concentration was 0.05 mol / L, and the pH was adjusted to 1.5. The raw material to be leached is chalcocite (Cu 2 S), the mass concentration is 5%. The temperature of the leaching tank is 30 degrees, and the temperature of the bacteria liquid tank is 30 degrees. The diaphragm is an anion exchange membrane, the current collector is a copper plate, and the positive and negative plates are made of graphite. The reaction time was 2 days, the leaching rate of copper in chalcocite was 80.5%, the recovered electric energy was 18.4kWh / t, and the microbial metabolism fixed carbon dioxide 27.5kg / t.

[0035] When the galvanic cell biometallurgical device of this embodiment is ...

Embodiment 2

[0044] The iron concentration of the leaching agent was 0.2 mol / L, the leaching aid NaCl was 20 g / L, 5 g / L sodium lignosulfonate or calcium lignosulfonate, and the sulfuric acid concentration was 2 mol / L. The microorganism in the bacterial solution was Leptospira ferrooxidans, the iron ion concentration was 0.1 mol / L, and the pH was adjusted to 1.7. The raw material to be leached is sphalerite (ZnS) with a mass concentration of 10%. The temperature of the leaching tank is 50 degrees, and the temperature of the bacteria liquid tank is 35 degrees. The diaphragm is an anion exchange membrane, the current collector is an aluminum plate, and the positive and negative plates are made of conductive plastic. The reaction time was 2 days, the leaching rate of zinc in sphalerite was 92.3%, the recovered electricity was 15.7kWh / t, and the microbial metabolism fixed carbon dioxide 23.5kg / t.

[0045] When the galvanic cell biometallurgical device of this embodiment is in operation, anion...

Embodiment 3

[0054] The iron concentration of the leaching agent was 0.01 mol / L, the leaching aid was 30 g / L NaCl, 30 g / L sodium lignosulfonate or calcium lignosulfonate, and the sulfuric acid concentration was 5 mol / L. The microorganism in the bacterial liquid was Thiobacillus acidophilus thermophilic, the iron ion concentration was 0.01 mol / L, and the pH was adjusted to 0.5. The raw material to be leached is sphalerite (ZnS) with a mass concentration of 10%. The temperature of the leaching tank is 80 degrees, and the temperature of the bacteria liquid tank is 50 degrees. The diaphragm is an anion exchange membrane, the current collector is an aluminum plate, and the positive and negative plates are made of conductive plastic. The reaction time was 2 days, the leaching rate of zinc in sphalerite was 87.3%, the recovered electrical energy was 13.6 kWh / t, and the microbial metabolism fixed carbon dioxide 20.4 kg / t.

[0055] When the galvanic cell biometallurgical device of this embodiment...

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Abstract

The invention discloses a biological metallurgy method and device based on a primary battery, and the method is based on the primary battery, a leaching agent is circularly communicated with a negative electrode groove of the primary battery, a microbial liquid is circularly communicated with a positive electrode groove of the primary battery, and a to-be-leached raw material is placed in the leaching agent; part of chemical energy of the raw material to be leached can be converted into electric energy by utilizing the potential difference between the leaching agent and the bacterial liquid. The primary battery jar separates the bacterial liquid from the leaching agent, the raw materials to be leached and toxic ions in the raw materials cannot be in direct contact with microorganisms, and the microorganisms cannot enter the natural environment along with leached waste materials. The leaching agent containing high-concentration acid and the oxidizing agent is used for increasing the dissolution rate, the bacterial liquid capable of regenerating the oxidizing agent is used for maintaining the high potential of the solution, microorganisms and the environment are isolated through the primary battery jar, meanwhile, the oxidizing agent in the leaching agent is regenerated, microorganism leakage is completely eradicated, and the material leaching efficiency is improved.

Description

technical field [0001] The present invention relates to the field of mineral processing and hydrometallurgy, in particular to a galvanic cell-based biometallurgical method and device thereof. Background technique [0002] Biometallurgy (bioleaching) mainly leaches the target element from the material through the redox, complexation / bonding, solubilization, etc. of microorganisms and their metabolites and further recycles them from the solution, because it is compared with pyrometallurgy and other The hydrometallurgical method has the advantages of energy saving, environmental protection and low cost, and is especially suitable for processing low-grade complex mineral resources, secondary resources and solid waste. Bioleaching mainly includes the principle of direct action / contact action and the principle of indirect action / non-contact action. The direct action mainly utilizes the corrosion and dissolution of adsorbed microorganisms and the formation of biofilms. In indirec...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B3/04C22B3/06C22B3/18
CPCC22B3/06C22B3/18C22B3/045Y02P10/20
Inventor赵红波张麓原申丽侯红帅顾帼华邱冠周
OwnerCENT SOUTH UNIV